阅读说明：本技术 卡压式管件超高压水涨与真空辅助成型的装置及方法 (ultrahigh-pressure water expansion and vacuum auxiliary forming device and method for clamp-press type pipe fitting ) 是由 李家泉 贾衍光 孙兆荣 陈大鹏 于 2019-09-10 设计创作，主要内容包括：卡压式管件超高压水涨与真空辅助成型的装置及方法,属于不锈钢卡压式薄壁管件加工设备领域。其特征在于：所述成型模包括上模体和下模体,在上模体中开设上模腔,在下模体中开设下模腔；上、下模体相对扣合后,上、下模腔围合组成成型腔体；所述左冲针和右冲针能够分别从左、右两端封堵管件的左、右管口,在左冲针的上开设管内排气孔,在右冲针上开设高压水注射孔；所述管内排气孔上安装管内排气电磁阀；高压水注射孔通过高压水注射阀和高压水导流管连接高压水源；在上模腔内开设贯穿上模体的抽真空通道,在型腔排气孔穿出下模体的外端安装型腔排气电磁阀。本装置能够保证工作水压在适宜的范围内且提高产品的成型质量和作业效率。(a device and a method for ultrahigh-pressure water expansion and vacuum-assisted forming of a clamping-pressing type pipe belong to the field of stainless steel clamping-pressing type thin-wall pipe processing equipment. The method is characterized in that: the forming die comprises an upper die body and a lower die body, wherein an upper die cavity is formed in the upper die body, and a lower die cavity is formed in the lower die body; after the upper and lower mould bodies are buckled relatively, the upper and lower mould cavities are enclosed to form a forming cavity; the left punching needle and the right punching needle can respectively plug the left pipe orifice and the right pipe orifice of the pipe fitting from the left end and the right end, the left punching needle is provided with an in-pipe exhaust hole, and the right punching needle is provided with a high-pressure water injection hole; an in-pipe exhaust electromagnetic valve is arranged on the in-pipe exhaust hole; the high-pressure water injection hole is connected with a high-pressure water source through a high-pressure water injection valve and a high-pressure water guide pipe; a vacuumizing channel penetrating through the upper die body is arranged in the upper die cavity, and a die cavity exhaust electromagnetic valve is arranged at the outer end of the die cavity exhaust hole penetrating through the lower die body. The device can ensure that the working water pressure is in a proper range and improve the forming quality and the operating efficiency of products.)

1. The ultrahigh pressure water expansion and vacuum auxiliary forming device for the clamp-press type pipe fitting is characterized in that: comprises a forming die, a left punching needle and a right punching needle; the forming die comprises an upper die body and a lower die body, wherein an upper die cavity is formed in the upper die body, and a lower die cavity is formed in the lower die body; after the upper die body and the lower die body are buckled oppositely, the upper die cavity and the lower die cavity are enclosed to form a forming cavity, and a left pipe fitting insertion opening and a right pipe fitting insertion opening are respectively arranged on two sides of the forming cavity; the left punching needle and the right punching needle can respectively plug the left pipe orifice and the right pipe orifice of the pipe fitting from the left end and the right end, the left punching needle is provided with an in-pipe exhaust hole, and the right punching needle is provided with a high-pressure water injection hole; an in-pipe exhaust electromagnetic valve is arranged on the in-pipe exhaust hole; the high-pressure water injection hole is connected with a high-pressure water source through a high-pressure water injection valve and a high-pressure water guide pipe;

a cavity vent hole penetrating through the lower die body is formed in the lower die cavity, and a cavity vent electromagnetic valve is installed at the outer end of the cavity vent hole penetrating through the lower die body; a vacuumizing channel penetrating through the upper die body is arranged in the upper die cavity, a vacuumizing electromagnetic valve is installed at the position where the vacuumizing channel penetrates through the upper die body, and then a vacuum storage tank and a vacuum pump are sequentially connected through a vacuum pipeline;

The forming die further comprises a sealing mechanism, and the sealing mechanism can seal gaps between the left pipe fitting insertion opening and the pipe fitting insertion opening and between the right pipe fitting insertion opening and the pipe fitting from the left side and the right side.

2. The ultrahigh-pressure water-swelling and vacuum-assisted forming device for the clamp-press type pipe fitting according to claim 1, wherein the ultrahigh-pressure water-swelling and vacuum-assisted forming device comprises: an upper die changing cavity and a lower die changing cavity are respectively arranged in the upper die body and the lower die body, an upper forming module and a lower forming module which can be disassembled are respectively arranged in the upper die changing cavity and the lower die changing cavity, the number of the upper forming module and the lower forming module is more than one,

The inner side surfaces of the upper forming module and the lower forming module are respectively provided with an upper die parting cavity and a lower die parting cavity with complex curved surfaces or small-radius curved surfaces, and when the upper die body and the lower die body are buckled together, the upper die parting cavity and the lower die parting cavity of each upper forming module and each lower forming module enclose a forming cavity; an upper vacuum-pumping channel penetrating through the upper forming module and the upper die body is formed in each upper die cavity, and a lower vacuum-pumping channel penetrating through the lower forming module and the lower die body is formed in each lower die cavity; each upper vacuumizing channel and each lower vacuumizing channel are sequentially connected with a vacuum storage tank and a vacuum pump through vacuum pipelines.

3. The ultrahigh-pressure water-swelling and vacuum-assisted forming device for the clamp-press type pipe fitting according to claim 2, wherein the ultrahigh-pressure water-swelling and vacuum-assisted forming device comprises: the sealing mechanism comprises a left sealing end cover and a right sealing end cover, wherein left and right pipe body sleeve holes are respectively formed in the left and right sealing end covers, and external threads are formed on the peripheral surfaces of the left and right sealing end covers; a left sealing caulking groove and a right sealing caulking groove are respectively formed in the left side and the right side of the upper die body and the lower die body, and internal threads are formed in the inner circumferential surfaces of the left sealing caulking groove and the right sealing caulking groove; when the upper and lower die bodies are buckled together, the left and right sealing end cover lantern rings can be sleeved on the pipe fitting from the left and right sides and are respectively arranged in the left and right sealing caulking grooves in a threaded connection mode; the periphery of the sleeve holes of the left and right tube bodies on the inner side surfaces of the left and right sealing end covers is respectively provided with an annular sealing groove with an L-shaped cross section, and an annular silica gel sealing ring is arranged in the annular sealing groove.

4. The ultrahigh-pressure water-swelling and vacuum-assisted forming device for the clamp-press type pipe fitting according to claim 2, wherein the ultrahigh-pressure water-swelling and vacuum-assisted forming device comprises: the sealing mechanism comprises an upper left sealing end cover, an upper right sealing end cover, a lower left sealing end cover and a lower right sealing end cover, the upper left sealing end cover and the upper right sealing end cover are respectively installed on the upper parts of the left end face and the right end face of the upper die body through an upper left hinge and an upper right hinge, and the lower left sealing end cover and the lower right sealing end cover are respectively installed on the upper parts of the left end face and the right end face of the lower die body through a lower left hinge and a lower right hinge;

Semi-annular sealing grooves are formed in the inner side surfaces of the upper left sealing end cover, the upper right sealing end cover, the lower left sealing end cover and the lower right sealing end cover, and semi-annular silica gel sealing rings are arranged in the semi-annular sealing grooves; all set up left side silica gel seal strake on the relative amalgamation of last left side end cover and lower left side end cover or faying surface, all set up right side silica gel seal strake on the relative amalgamation of last right side end cover and lower right side end cover or the faying surface.

5. The ultrahigh-pressure water-swelling and vacuum-assisted forming device for the clamp-press type pipe fitting according to claim 4, wherein the ultrahigh-pressure water-swelling and vacuum-assisted forming device comprises: an upper left bolt seat and a lower left bolt seat are respectively arranged on the outer sides of the upper left sealing end cover and the lower left sealing end cover, an upper left bolt hole and a lower left bolt hole are respectively formed in the upper left bolt seat and the lower left bolt seat, and a left bolt column is inserted into the upper left bolt hole and the lower left bolt hole in a penetrating manner; and an upper right bolt seat and a lower right bolt seat are respectively arranged on the outer sides of the upper right sealing end cover and the lower right sealing end cover, an upper right bolt hole and a lower right bolt hole are respectively formed in the upper right bolt seat and the lower right bolt seat, and a right bolt column is inserted into the upper right bolt hole and the lower right bolt hole in a penetrating manner.

6. The ultrahigh-pressure water-swelling and vacuum-assisted forming device for the clamp-press type pipe fitting according to claim 2, wherein the sealing mechanism comprises a left sealing functional group and a right sealing functional group;

the left sealing function group comprises a left end cover and a left core ring, the left end surfaces of the upper die body and the lower die body are respectively provided with an upper left extrusion groove and a lower left extrusion groove of a semi-annular body, and the upper left extrusion groove and the lower left extrusion groove are spliced to form a circular ring-shaped left extrusion groove coaxial with the socket of the left pipe fitting; the left core ring comprises a left annular flange and a left core body, a left outer pipe fitting socket is formed in the middle of the left core body, the left outer pipe fitting socket and the left pipe fitting socket are coaxially arranged in an equal diameter mode, the left core ring is sleeved on the pipe fitting from the left side, the left core body is inserted into the left extrusion groove, and the left core ring is installed on the outer end faces of the left sides of the upper and lower die bodies which are buckled together through a left annular flange and a left flange installation bolt; a left annular sealing ring mounting plate is arranged between the left core body and the left extrusion groove, and a conical self-lubricating left silica gel sealing ring is fixed on the right end surface of the left annular sealing ring mounting plate; a conical left side sealing extrusion gap is formed at the bottom of the left side extrusion groove; the middle part of the left end cover is provided with a left sleeve hole, and the left end cover is sleeved on the pipe fitting through the left sleeve hole and is arranged on the left side of the left core ring; at least four left extrusion push rods are arranged on the right side of the left end cover and around the periphery of the left sleeve hole, left extrusion push holes with the same number as the left extrusion push rods are correspondingly formed in the left core body, and each left extrusion push rod is inserted into the left extrusion push hole; when the left end cover is extruded from left to right, the left side extrusion pushing hole can push the left side annular sealing ring, and then the right end of the left side silica gel sealing ring is inserted into the left side sealing extrusion gap;

The right sealing function group comprises a right end cover and a right core ring, an upper right extrusion groove and a lower right extrusion groove of a semi-annular body are respectively formed in the right end faces of the upper die body and the lower die body, and the upper right extrusion groove and the lower right extrusion groove are spliced to form a circular right extrusion groove which is coaxial with the socket of the right pipe fitting; the right core ring comprises a right annular flange and a right core body, a right outer pipe fitting socket is formed in the middle of the right core body, the right outer pipe fitting socket and the right pipe fitting socket are coaxially arranged in an equal diameter mode, the right core ring is sleeved on the pipe fitting from the right side, the right core body is inserted into the right extrusion groove, and the right core ring is installed on the outer end faces of the right sides of the upper and lower die bodies which are buckled together through a right annular flange and a right flange installation bolt; a right annular sealing ring mounting plate is arranged between the right core body and the right extrusion groove, and a conical self-lubricating right silica gel sealing ring is fixed on the right end surface of the right annular sealing ring mounting plate; a conical right side sealing extrusion gap is formed at the bottom of the right side extrusion groove; the middle part of the right end cover is provided with a right sleeve hole, and the right end cover is sleeved on the pipe fitting through the right sleeve hole and is arranged on the right side of the right core ring; at least four right extrusion push rods are arranged on the left side of the right end cover and around the periphery of the right sleeve hole, right extrusion push holes with the same number as the right extrusion push rods are correspondingly formed in the right core body, and each right extrusion push rod is inserted into the right extrusion push hole; when the right end cover is extruded from the right side to the right side, the right side extrusion pushing hole can push the right side annular sealing ring, and then the right end of the right side silica gel sealing ring is inserted into the right side sealing extrusion gap.

7. The ultrahigh-pressure water-swelling and vacuum-assisted forming device for the clamp-press type pipe fitting according to claim 6, wherein the ultrahigh-pressure water-swelling and vacuum-assisted forming device comprises: the device also comprises a left extrusion power device and a right extrusion power device;

The left extrusion power device comprises a left extrusion driving cylinder, a left extrusion driving motor is arranged at the upper part of the upper die body or the lower part of the lower die body, and a telescopic rod of the left extrusion driving cylinder is connected with the left end cover through a mounting lock catch and can drive the left end cover to move left and right;

the right side extrusion power device comprises a right side extrusion driving cylinder, a right side extrusion driving motor is installed on the upper portion of the upper die body or the lower portion of the lower die body, and a telescopic rod of the right side extrusion driving cylinder is connected with the right end cover through an installation lock catch and can drive the right end cover to move left and right.

8. the ultrahigh-pressure water-swelling and vacuum-assisted forming device for the clamp-press type pipe fitting according to claim 7, wherein the ultrahigh-pressure water-swelling and vacuum-assisted forming device comprises: still include left side extension spring and right side extension spring that resets, the left end face of left core and left side ring type seal ring is connected respectively at the both ends of left side extension spring that resets, the right end face of right core and right side ring type seal ring is connected respectively at the both ends of right side extension spring that resets.

9. The molding method of the ultrahigh-pressure water-swelling and vacuum-assisted molding device for the clamp-press type pipe fitting according to claim 8, characterized by comprising the following steps:

(1) Separating the upper die body and the lower die body, replacing the upper forming module and the lower forming module corresponding to the forming size according to the requirement, and installing the upper forming module and the lower forming module in an upper die changing cavity and a lower die changing cavity of the upper die body and the lower die body;

(2) Placing the pipe fitting on the lower die body, and enabling the left end and the right end of the pipe fitting to be respectively arranged in the left pipe fitting jack and the right pipe fitting jack, so that the belt forming part of the pipe fitting is completely positioned in the forming cavity;

(3) Buckling the upper die body and the lower die body together, and installing sealing mechanisms at two ends of the buckled upper die body and lower die body;

(4) inserting a left punching needle and a right punching needle into the left end and the right end of the pipe fitting respectively and completely sealing the pipe orifice of the pipe fitting;

(5) Filling water into the pipe fitting through a high-pressure water injection hole of the right punching needle, exhausting gas in the pipe fitting through an exhaust hole on the left punching needle in the early stage of injection, and starting to inject high-pressure water after exhausting; meanwhile, opening a cavity exhaust electromagnetic valve, and closing the cavity exhaust electromagnetic valve after exhausting air in the molding cavity; and starting a vacuum pump, pumping the inside of the forming cavity into a negative pressure state sequentially through the upper vacuumizing channel, the lower vacuumizing channel and the vacuum pipeline until the pipe fitting is expanded in the forming cavity under the action of negative pressure and high-pressure water until the pipe fitting is completely attached to the forming cavity, and finishing the precise forming processing of the complex curved surface or the small pipe diameter of the pipe fitting.

10. the molding method of the ultrahigh-pressure water-swelling and vacuum-assisted molding device for the clamp-press type pipe fitting according to claim 9, characterized in that: the mounting of the sealing mechanism in the step (3) comprises the steps of:

a. firstly, respectively sleeving a left annular sealing ring mounting plate and a right annular sealing ring mounting plate at the left end and the right end of a pipe fitting, and enabling the small-diameter ends of the left silica gel sealing ring and the right silica gel sealing ring to be oppositely arranged;

b. sleeving a left core ring on the pipe fitting from the left side, inserting the left core body into the left extrusion groove, and installing the left core ring on the outer end faces of the left sides of the upper and lower die bodies which are buckled together through a left annular flange and a left flange installation bolt; the right core ring is sleeved on the pipe fitting from the right side, the right core body is inserted into the right extrusion groove, and the right core ring is arranged on the outer end faces of the right sides of the upper die body and the lower die body which are buckled together through a right annular flange and a right flange mounting bolt;

c. The left end cover is sleeved on the pipe fitting through the left sleeve hole and is arranged on the left side of the left core ring; each left extrusion push rod is inserted into the left extrusion push hole;

the right end cover is sleeved on the pipe fitting through the right sleeve hole and is arranged on the right side of the right core ring; each right side extrusion push rod is inserted into the right side extrusion push hole;

d. Starting the left side extrusion driving cylinder, extruding the left end cover from left to right, pushing the left side annular sealing ring by the left side extrusion pushing hole, and inserting the left end of the left side silica gel sealing ring into the left side sealing extrusion gap;

the right side is started to extrude the driving cylinder, the right end cover is extruded from right to left, the right side extruding and pushing hole can push the right side annular sealing ring, and then the right end of the right side silica gel sealing ring is inserted into the right side sealing and extruding gap.

Technical Field

the invention belongs to the field of stainless steel clamping and pressing type thin-wall pipe fitting machining equipment, and particularly relates to a stainless steel pipe fitting forming device.

Background

Under the existing technical conditions, the stainless steel clamping and pressing type thin-wall pipe fitting manufactured by high-pressure water internal expansion forming has the following advantages: the water expansion forming method has high speed and high quality and the minimum scratch area; but also has disadvantages: the water pressure is high during operation, the requirement on a pipeline valve of equipment bearing high pressure is very high, 2-3 fittings such as a high-pressure water pipe one-way valve high-pressure seal need to be replaced every quarter, the product percent of pass is 95% left and right wandering all the time, in addition, the processing and forming quality aiming at the product with the curved surface radius smaller than 2 mm is not high, secondary rolling repair is needed, and the error of the outer diameter of the product can not be improved within 0.4 mm.

In view of this, the applicant designs the device, which can ensure the working water pressure in a proper range and improve the forming quality and the working efficiency of the product.

disclosure of Invention

the invention aims to solve the technical problem of providing a device and a method for ultrahigh-pressure water expansion and vacuum auxiliary forming of a clamp-press type pipe fitting, which can ensure that the working water pressure is in a proper range and improve the forming quality and the operation efficiency of a product.

In order to solve the technical problems, the technical scheme of the invention is as follows: the invention relates to a device for ultrahigh-pressure water expansion and vacuum auxiliary forming of a clamp-press type pipe fitting, which is characterized in that: comprises a forming die, a left punching needle and a right punching needle; the forming die comprises an upper die body and a lower die body, wherein an upper die cavity is formed in the upper die body, and a lower die cavity is formed in the lower die body; after the upper die body and the lower die body are buckled oppositely, the upper die cavity and the lower die cavity are enclosed to form a forming cavity, and a left pipe fitting insertion opening and a right pipe fitting insertion opening are respectively arranged on two sides of the forming cavity; the left punching needle and the right punching needle can respectively plug the left pipe orifice and the right pipe orifice of the pipe fitting from the left end and the right end, the left punching needle is provided with an in-pipe exhaust hole, and the right punching needle is provided with a high-pressure water injection hole; an in-pipe exhaust electromagnetic valve is arranged on the in-pipe exhaust hole; the high-pressure water injection hole is connected with a high-pressure water source through a high-pressure water injection valve and a high-pressure water guide pipe;

A cavity vent hole penetrating through the lower die body is formed in the lower die cavity, and a cavity vent electromagnetic valve is installed at the outer end of the cavity vent hole penetrating through the lower die body; a vacuumizing channel penetrating through the upper die body is arranged in the upper die cavity, a vacuumizing electromagnetic valve is installed at the position where the vacuumizing channel penetrates through the upper die body, and then a vacuum storage tank and a vacuum pump are sequentially connected through a vacuum pipeline;

The forming die further comprises a sealing mechanism, and the sealing mechanism can seal gaps between the left pipe fitting insertion opening and the pipe fitting insertion opening and between the right pipe fitting insertion opening and the pipe fitting from the left side and the right side.

preferably, an upper die changing cavity and a lower die changing cavity are respectively arranged in the upper die body and the lower die body, an upper forming module and a lower forming module which can be disassembled are respectively arranged in the upper die changing cavity and the lower die changing cavity, the number of the upper forming module and the lower forming module is more than one,

the inner side surfaces of the upper forming module and the lower forming module are respectively provided with an upper die parting cavity and a lower die parting cavity with complex curved surfaces or small-radius curved surfaces, and when the upper die body and the lower die body are buckled together, the upper die parting cavity and the lower die parting cavity of each upper forming module and each lower forming module enclose a forming cavity; an upper vacuum-pumping channel penetrating through the upper forming module and the upper die body is formed in each upper die cavity, and a lower vacuum-pumping channel penetrating through the lower forming module and the lower die body is formed in each lower die cavity; each upper vacuumizing channel and each lower vacuumizing channel are sequentially connected with a vacuum storage tank and a vacuum pump through vacuum pipelines.

preferably, the sealing mechanism comprises a left sealing end cover and a right sealing end cover, the left sealing end cover and the right sealing end cover are respectively provided with a left pipe body sleeve hole and a right pipe body sleeve hole, and the peripheral surfaces of the left sealing end cover and the right sealing end cover are provided with external threads; a left sealing caulking groove and a right sealing caulking groove are respectively formed in the left side and the right side of the upper die body and the lower die body, and internal threads are formed in the inner circumferential surfaces of the left sealing caulking groove and the right sealing caulking groove; when the upper and lower die bodies are buckled together, the left and right sealing end cover lantern rings can be sleeved on the pipe fitting from the left and right sides and are respectively arranged in the left and right sealing caulking grooves in a threaded connection mode; the periphery of the sleeve holes of the left and right tube bodies on the inner side surfaces of the left and right sealing end covers is respectively provided with an annular sealing groove with an L-shaped cross section, and an annular silica gel sealing ring is arranged in the annular sealing groove.

Preferably, the sealing mechanism comprises an upper left sealing end cover, an upper right sealing end cover, a lower left sealing end cover and a lower right sealing end cover, the upper left sealing end cover and the upper right sealing end cover are respectively installed on the upper parts of the left end face and the right end face of the upper die body through an upper left hinge and an upper right hinge, and the lower left sealing end cover and the lower right sealing end cover are respectively installed on the upper parts of the left end face and the right end face of the lower die body through a lower left hinge and a lower right hinge;

Semi-annular sealing grooves are formed in the inner side surfaces of the upper left sealing end cover, the upper right sealing end cover, the lower left sealing end cover and the lower right sealing end cover, and semi-annular silica gel sealing rings are arranged in the semi-annular sealing grooves; all set up left side silica gel seal strake on the relative amalgamation of last left side end cover and lower left side end cover or faying surface, all set up right side silica gel seal strake on the relative amalgamation of last right side end cover and lower right side end cover or the faying surface.

Preferably, an upper left bolt seat and a lower left bolt seat are respectively arranged on the outer sides of the upper left sealing end cover and the lower left sealing end cover, an upper left bolt hole and a lower left bolt hole are respectively formed in the upper left bolt seat and the lower left bolt seat, and a left bolt column is inserted into the upper left bolt hole and the lower left bolt hole in a penetrating manner; and an upper right bolt seat and a lower right bolt seat are respectively arranged on the outer sides of the upper right sealing end cover and the lower right sealing end cover, an upper right bolt hole and a lower right bolt hole are respectively formed in the upper right bolt seat and the lower right bolt seat, and a right bolt column is inserted into the upper right bolt hole and the lower right bolt hole in a penetrating manner.

Preferably, the sealing mechanism comprises a left sealing function group and a right sealing function group;

The left sealing function group comprises a left end cover and a left core ring, the left end surfaces of the upper die body and the lower die body are respectively provided with an upper left extrusion groove and a lower left extrusion groove of a semi-annular body, and the upper left extrusion groove and the lower left extrusion groove are spliced to form a circular ring-shaped left extrusion groove coaxial with the socket of the left pipe fitting; the left core ring comprises a left annular flange and a left core body, a left outer pipe fitting socket is formed in the middle of the left core body, the left outer pipe fitting socket and the left pipe fitting socket are coaxially arranged in an equal diameter mode, the left core ring is sleeved on the pipe fitting from the left side, the left core body is inserted into the left extrusion groove, and the left core ring is installed on the outer end faces of the left sides of the upper and lower die bodies which are buckled together through a left annular flange and a left flange installation bolt; a left annular sealing ring mounting plate is arranged between the left core body and the left extrusion groove, and a conical self-lubricating left silica gel sealing ring is fixed on the right end surface of the left annular sealing ring mounting plate; a conical left side sealing extrusion gap is formed at the bottom of the left side extrusion groove; the middle part of the left end cover is provided with a left sleeve hole, and the left end cover is sleeved on the pipe fitting through the left sleeve hole and is arranged on the left side of the left core ring; at least four left extrusion push rods are arranged on the right side of the left end cover and around the periphery of the left sleeve hole, left extrusion push holes with the same number as the left extrusion push rods are correspondingly formed in the left core body, and each left extrusion push rod is inserted into the left extrusion push hole; when the left end cover is extruded from left to right, the left side extrusion pushing hole can push the left side annular sealing ring, and then the right end of the left side silica gel sealing ring is inserted into the left side sealing extrusion gap;

The right sealing function group comprises a right end cover and a right core ring, an upper right extrusion groove and a lower right extrusion groove of a semi-annular body are respectively formed in the right end faces of the upper die body and the lower die body, and the upper right extrusion groove and the lower right extrusion groove are spliced to form a circular right extrusion groove which is coaxial with the socket of the right pipe fitting; the right core ring comprises a right annular flange and a right core body, a right outer pipe fitting socket is formed in the middle of the right core body, the right outer pipe fitting socket and the right pipe fitting socket are coaxially arranged in an equal diameter mode, the right core ring is sleeved on the pipe fitting from the right side, the right core body is inserted into the right extrusion groove, and the right core ring is installed on the outer end faces of the right sides of the upper and lower die bodies which are buckled together through a right annular flange and a right flange installation bolt; a right annular sealing ring mounting plate is arranged between the right core body and the right extrusion groove, and a conical self-lubricating right silica gel sealing ring is fixed on the right end surface of the right annular sealing ring mounting plate; a conical right side sealing extrusion gap is formed at the bottom of the right side extrusion groove; the middle part of the right end cover is provided with a right sleeve hole, and the right end cover is sleeved on the pipe fitting through the right sleeve hole and is arranged on the right side of the right core ring; at least four right extrusion push rods are arranged on the left side of the right end cover and around the periphery of the right sleeve hole, right extrusion push holes with the same number as the right extrusion push rods are correspondingly formed in the right core body, and each right extrusion push rod is inserted into the right extrusion push hole; when the right end cover is extruded from the right side to the right side, the right side extrusion pushing hole can push the right side annular sealing ring, and then the right end of the right side silica gel sealing ring is inserted into the right side sealing extrusion gap.

Preferably, the device also comprises a left-side extrusion power device and a right-side extrusion power device;

the left extrusion power device comprises a left extrusion driving cylinder, a left extrusion driving motor is arranged at the upper part of the upper die body or the lower part of the lower die body, and a telescopic rod of the left extrusion driving cylinder is connected with the left end cover through a mounting lock catch and can drive the left end cover to move left and right;

the right side extrusion power device comprises a right side extrusion driving cylinder, a right side extrusion driving motor is installed on the upper portion of the upper die body or the lower portion of the lower die body, and a telescopic rod of the right side extrusion driving cylinder is connected with the right end cover through an installation lock catch and can drive the right end cover to move left and right.

Preferably, still include left side extension spring and the right side extension spring that resets, the left end face of left core and left side ring type seal ring is connected respectively at the both ends of left side extension spring that resets, the right end face of right core and right side ring type seal ring is connected respectively at the both ends of right side extension spring that resets.

The invention relates to a molding method of a device for ultrahigh-pressure water expansion and vacuum assisted molding of a clamp-press type pipe fitting, which is characterized by comprising the following steps of:

(1) Separating the upper die body and the lower die body, replacing the upper forming module and the lower forming module corresponding to the forming size according to the requirement, and installing the upper forming module and the lower forming module in an upper die changing cavity and a lower die changing cavity of the upper die body and the lower die body;

(2) Placing the pipe fitting on the lower die body, and enabling the left end and the right end of the pipe fitting to be respectively arranged in the left pipe fitting jack and the right pipe fitting jack, so that the belt forming part of the pipe fitting is completely positioned in the forming cavity;

(3) buckling the upper die body and the lower die body together, and installing sealing mechanisms at two ends of the buckled upper die body and lower die body;

(4) Inserting a left punching needle and a right punching needle into the left end and the right end of the pipe fitting respectively and completely sealing the pipe orifice of the pipe fitting;

(5) filling water into the pipe fitting through a high-pressure water injection hole of the right punching needle, exhausting gas in the pipe fitting through an exhaust hole on the left punching needle in the early stage of injection, and starting to inject high-pressure water after exhausting; meanwhile, opening a cavity exhaust electromagnetic valve, and closing the cavity exhaust electromagnetic valve after exhausting air in the molding cavity; and starting a vacuum pump, pumping the inside of the forming cavity into a negative pressure state sequentially through the upper vacuumizing channel, the lower vacuumizing channel and the vacuum pipeline until the pipe fitting is expanded in the forming cavity under the action of negative pressure and high-pressure water until the pipe fitting is completely attached to the forming cavity, and finishing the precise forming processing of the complex curved surface or the small pipe diameter of the pipe fitting.

preferably, the installing the sealing mechanism in the step (3) includes the steps of:

a. firstly, respectively sleeving a left annular sealing ring mounting plate and a right annular sealing ring mounting plate at the left end and the right end of a pipe fitting, and enabling the small-diameter ends of the left silica gel sealing ring and the right silica gel sealing ring to be oppositely arranged;

b. sleeving a left core ring on the pipe fitting from the left side, inserting the left core body into the left extrusion groove, and installing the left core ring on the outer end faces of the left sides of the upper and lower die bodies which are buckled together through a left annular flange and a left flange installation bolt; the right core ring is sleeved on the pipe fitting from the right side, the right core body is inserted into the right extrusion groove, and the right core ring is arranged on the outer end faces of the right sides of the upper die body and the lower die body which are buckled together through a right annular flange and a right flange mounting bolt;

c. The left end cover is sleeved on the pipe fitting through the left sleeve hole and is arranged on the left side of the left core ring; each left extrusion push rod is inserted into the left extrusion push hole;

the right end cover is sleeved on the pipe fitting through the right sleeve hole and is arranged on the right side of the right core ring; each right side extrusion push rod is inserted into the right side extrusion push hole;

d. starting the left side extrusion driving cylinder, extruding the left end cover from left to right, pushing the left side annular sealing ring by the left side extrusion pushing hole, and inserting the left end of the left side silica gel sealing ring into the left side sealing extrusion gap;

The right side is started to extrude the driving cylinder, the right end cover is extruded from right to left, the right side extruding and pushing hole can push the right side annular sealing ring, and then the right end of the right side silica gel sealing ring is inserted into the right side sealing and extruding gap.

compared with the prior art, the invention has the beneficial effects that:

1. The invention can ensure that the working water pressure is in a proper range and improve the molding quality and the operating efficiency of the product.

2. the product external diameter deviation that adopts forming mode DN50 among the prior art fluctuates between 0.4 millimeter, and through the water rise with the use of vacuum auxiliary forming device, the external diameter error control is within 0.1 millimeter, and product quality stability improves by a wide margin.

3. the method reduces the high-pressure water pressure by 30 MPa on the premise of ensuring the molding quality, prolongs the service life of accessories such as a die, a left punching needle, a right punching needle, each electromagnetic valve, a 150 MPa high-pressure hose and the like by more than two times, reduces the overhaul rate, improves the production efficiency and obviously reduces the product cost. The method has simple structure and flexible and convenient use, and is suitable for popularization in the industry.

4. The applicant designs and uses a mechanical sealing structure with reasonable structure in the device, and does not need to buy expensive high-pressure sealing elements, so that the pressure tolerance is stronger, the use cost of the device is greatly reduced, and the sealing effect is better.

drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic structural view of the present invention (second embodiment: left and right hermetic end caps are not completely mounted);

FIG. 4 is a schematic structural view of a right seal end cap;

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a schematic structural view of the present invention (second embodiment: left and right end caps installed);

FIG. 7 is a schematic structural view of the present invention (embodiment III);

FIG. 8 is a schematic view of the lower left end closure;

FIG. 9 is a schematic structural view of the present invention (embodiment four);

FIG. 10 is a schematic view of the structure of the left side seal functional group;

The labels in the figure are: 1. feeding a mold body; 2. an upper mold cavity; 3. a vacuum channel is pumped; 4. vacuumizing an electromagnetic valve; 5. a vacuum line; 6. a vacuum storage tank; 7. a right punching needle; 8. high-pressure water injection holes; 9. a high-pressure water injection valve; 10. a lower die body; 11. a lower die cavity; 12. an exhaust hole in the pipe; 13. an exhaust electromagnetic valve in the pipe; 14. punching the needle leftwards; 15. a pipe fitting; 16. a vacuum pump; 17. a cavity vent hole; 18. a cavity exhaust electromagnetic valve; 19. a left seal end cap; 20. a left sealing caulking groove; 21. an upper parting die cavity; 22. an upper vacuum pumping channel; 23. an upper forming module; 24. a right sealing caulking groove; 26. A right seal end cap; 27. a lower forming module; 28. a lower evacuation channel; 29. a lower parting die cavity; 30. an external thread; 31. an annular silica gel seal ring; 32. a right pipe body trepanning; 33. a right sealing caulking groove; 34. an upper left hinge; 35. an upper left sealing end cover; 36. a left side latch post; 37. an upper left bolt seat; 38. a lower left bolt seat; 39. a lower left end cap; 40. a lower left hinge; 41. a lower right hinge; 42. a lower right sealing end cap; 43. a lower right bolt seat; 44. an upper right bolt seat; 45. a right side latch post; 46. an upper right sealing end cover; 47. an upper right hinge; 48. sealing the edge strips with silica gel on the left side; 49. a semi-annular silica gel seal ring; 50. a left end cap; 51. a push rod is extruded in the left side; 52. the left side is sleeved with a pipe hole; 53. a left core; 54. a left reset tension spring; 55. a self-lubricating left silica gel seal ring; 56. a self-lubricating right silica gel sealing ring; 57. a right reset tension spring; 58. a right core body; 59. the right side is sleeved with a pipe hole; 60. a push rod is extruded at the right side; 61. a right end cap; 62. a bolt is installed on the right flange; 63. a right annular flange; 64. installing a lock catch; 65. extruding into the groove from the upper right; 66. the right side is extruded into a driving cylinder; 67. the left side is extruded into a driving cylinder; 68. extruding into the groove from the upper left; 69. installing a lock catch; 70. a left annular flange; 71. mounting a bolt on the left flange; 72. the conical left side is sealed and extruded into the gap; 73. a left annular seal ring mounting plate; 74. right side ring seal mounting panel.

Detailed Description

The invention is described in further detail below with reference to the figures and reference numerals.

As shown in fig. 1 and 2, the device for ultrahigh-pressure water expansion and vacuum assisted molding of a clamp-press type pipe fitting comprises a molding die, a left punching needle and a right punching needle; the forming die comprises an upper die body and a lower die body, wherein an upper die cavity is formed in the upper die body, and a lower die cavity is formed in the lower die body; after the upper die body and the lower die body are buckled oppositely, the upper die cavity and the lower die cavity are enclosed to form a forming cavity, and a left pipe fitting insertion opening and a right pipe fitting insertion opening are respectively arranged on two sides of the forming cavity; the left punching needle and the right punching needle can respectively plug the left pipe orifice and the right pipe orifice of the pipe fitting from the left end and the right end, the left punching needle is provided with an in-pipe exhaust hole, and the right punching needle is provided with a high-pressure water injection hole; an in-pipe exhaust electromagnetic valve is arranged on the in-pipe exhaust hole; the high-pressure water injection hole is connected with a high-pressure water source through a high-pressure water injection valve and a high-pressure water guide pipe.

a cavity vent hole penetrating through the lower die body is formed in the lower die cavity, and a cavity vent electromagnetic valve is installed at the outer end of the cavity vent hole penetrating through the lower die body; and a vacuumizing channel penetrating through the upper die body is arranged in the upper die cavity (the vacuumizing channel needs to be arranged at the position with the minimum R arc and the position with the maximum diameter of the forming cavity), the vacuumizing channel penetrates out of the upper die body, a vacuumizing electromagnetic valve is installed, and then a vacuum storage tank and a vacuum pump are sequentially connected through a vacuum pipeline.

the forming die further comprises a sealing mechanism, and the sealing mechanism can seal gaps between the left pipe fitting insertion opening and the pipe fitting insertion opening and between the right pipe fitting insertion opening and the pipe fitting from the left side and the right side.

the using method of the invention comprises the following steps:

(1) separating the upper die body and the lower die body, replacing the upper forming module and the lower forming module corresponding to the forming size according to the requirement, and installing the upper forming module and the lower forming module in an upper die changing cavity and a lower die changing cavity of the upper die body and the lower die body;

(2) placing the pipe fitting on the lower die body, and enabling the left end and the right end of the pipe fitting to be respectively arranged in the left pipe fitting jack and the right pipe fitting jack, so that the belt forming part of the pipe fitting is completely positioned in the forming cavity;

(3) buckling the upper die body and the lower die body together, and installing sealing mechanisms at two ends of the buckled upper die body and lower die body;

(4) Inserting a left punching needle and a right punching needle into the left end and the right end of the pipe fitting respectively and completely sealing the pipe orifice of the pipe fitting;

(5) filling water into the pipe fitting through a high-pressure water injection hole of the right punching needle, exhausting gas in the pipe fitting through an exhaust hole on the left punching needle in the early stage of injection, and starting to inject high-pressure water after exhausting; meanwhile, opening a cavity exhaust electromagnetic valve, and closing the cavity exhaust electromagnetic valve after exhausting air in the molding cavity; and starting a vacuum pump, pumping the inside of the forming cavity into a negative pressure state sequentially through the upper vacuumizing channel, the lower vacuumizing channel and the vacuum pipeline until the pipe fitting is expanded in the forming cavity under the action of negative pressure and high-pressure water until the pipe fitting is completely attached to the forming cavity, and finishing the precise forming processing of the complex curved surface or the small pipe diameter of the pipe fitting.