阅读说明：本技术 一种圆管整圆模具 (Round pipe rounding die ) 是由 王卫 何照辉 方君龙 周克中 于 2021-08-05 设计创作，主要内容包括：本发明提供了一种圆管整圆模具,包括同轴套设的扩口模和缩口模,扩口模的内锥面内套设有具有外锥面的锥形芯棒；缩口模的外锥面外侧套设有具有内锥面的罩口模；还包括与锥形芯棒同轴配合的挡板,所述挡板设置于缩口模远离罩口模一侧并与缩口模沿轴向抵接,所述锥形芯棒远离罩口模的一端与油缸的输出端固定配合,所述油缸的输出端还与挡板远离罩口模的端部抵接配合。本发明的优点在于：通过油缸同时作用于锥形芯棒和缩口模,使扩口模膨胀内扩,同时使缩口模在管口外侧收缩,实现管口整圆的目的,仅需要一个油缸或类似的直线驱动组件驱动,降低设备成本,不需要考虑多油缸行程调试的问题,确保整圆后的管口直径符合设计要求。(The invention provides a round pipe rounding die which comprises a flaring die and a necking die which are coaxially sleeved, wherein a conical core rod with an outer conical surface is sleeved in an inner conical surface of the flaring die; a cover opening die with an inner conical surface is sleeved outside the outer conical surface of the necking die; the oil cylinder is characterized by further comprising a baffle which is coaxially matched with the conical core rod, the baffle is arranged on one side, away from the cover neck ring, of the neck ring and is in axial butt joint with the neck ring, one end, away from the cover neck ring, of the conical core rod is fixedly matched with the output end of the oil cylinder, and the output end of the oil cylinder is in butt joint with the end, away from the cover neck ring, of the baffle. The invention has the advantages that: the oil cylinder acts on the conical core rod and the necking die simultaneously, so that the flaring die expands and contracts outside the pipe orifice, the purpose of rounding the pipe orifice is achieved, the oil cylinder or a similar linear driving assembly is only needed for driving, the equipment cost is reduced, the problem of debugging of the stroke of the multiple oil cylinders is not needed to be considered, and the diameter of the pipe orifice after rounding meets the design requirement.)

1. A round tube rounding die comprises a flaring die and a necking die which are coaxially sleeved, wherein a conical core rod with an outer conical surface is sleeved in an inner conical surface of the flaring die; a cover opening die with an inner conical surface is sleeved outside the outer conical surface of the necking die; the method is characterized in that: the oil cylinder is characterized by further comprising a baffle which is coaxially matched with the conical core rod, the baffle is arranged on one side, away from the cover neck ring, of the neck ring and is in axial butt joint with the neck ring, one end, away from the cover neck ring, of the conical core rod is fixedly matched with the output end of the oil cylinder, and the output end of the oil cylinder is in butt joint with the end, away from the cover neck ring, of the baffle.

2. The round tube rounding die of claim 1, wherein: the baffle is characterized in that at least two guide pins fixedly matched with the cover opening die are fixed on the baffle along the circumferential direction, the baffle can be in sliding fit with the guide pins along the axial direction, and a spring positioned between the baffle and the cover opening die is sleeved on each guide pin.

3. The round tube rounding die of claim 1, wherein: the tapered core rod comprises a tapered section and a flat section, the flat section is inserted into a core rod sleeve, the baffle sleeve is arranged on the outer side of the core rod sleeve, and the output end of the oil cylinder is fixedly matched with the core rod sleeve.

4. The round tube rounding die according to claim 3, characterized in that: the one end that the hydro-cylinder was kept away from to the plug cover is provided with along the radial evagination limiting plate, be provided with in the baffle with limiting plate sliding fit's slip chamber, the one end that the slip chamber is close to the hydro-cylinder is provided with the end cover, end cover and plug cover transition fit.

5. The round tube rounding die according to claim 4, characterized in that: and one end of the mandrel sleeve, which is close to the oil cylinder, is also provided with a mandrel seat, and a fixing bolt which penetrates through the mandrel sleeve and is connected with the conical mandrel is axially arranged on the mandrel seat.

6. The round tube rounding die according to claim 5, characterized in that: the output end of the oil cylinder is fixedly connected with a connecting block, the connecting block is abutted to the end face of the mandrel base, the connecting block further comprises a top block located on the side face of the mandrel base, and the top block can be axially abutted to the end cover.

7. The round tube rounding die of claim 6, wherein: the diameter of the mandrel seat is larger than that of the mandrel sleeve, the side face of the ejector block is in adaptive contact fit with the mandrel seat and the side face of the mandrel sleeve, and when the oil cylinder does not work, a gap is formed between the end face of the ejector block and the end cover.

8. The round tube rounding die of claim 1, wherein: the flaring die comprises eight flaring fan-shaped petals, and the necking die comprises eight necking fan-shaped petals.

9. The round tube rounding die of claim 8, wherein: and an elastic ring hooped outside the flaring die is arranged outside the flaring die.

10. The round tube rounding die of claim 9, wherein: the elastic ring is arranged at one end of the flaring die close to the baffle, and is made of polyurethane.

Technical Field

The invention relates to the technical field of pipe orifice machining of circular pipes, in particular to a circular pipe rounding die.

Background

The existing equipment for rounding in the market is mainly a double-cylinder horizontal oil press, for example, a pipe fitting sizing die disclosed in the patent application with the publication number of CN103182459A, adopts a structure of internal expansion and external contraction, uses a mandril with an external conical surface to be matched with an expansion core with an internal conical surface, uses a pressing sleeve with an internal conical surface to be matched with a reducing sleeve with an external conical surface, compresses the mandril and the pressing sleeve through two opposite oil cylinders respectively, and realizes the rounding and sizing of a pipe orifice through the matching of the expansion core and the reducing sleeve; the scheme needs to use two oil cylinders, so that the equipment cost is high, and when the equipment is debugged, the strokes of the two oil cylinders need to be debugged respectively, so that the required time is longer; and the two oil cylinders need to keep stroke synchronization, otherwise, the radius of the pipe orifice can deviate.

The patent application with publication number CN107008808A discloses a pipe orifice processing device, which discloses the technical contents that "the driving device can drive the inner mold to radially expand and contract and the outer mold to radially expand and contract, and can also drive the inner mold and the outer mold to radially and synchronously expand and contract", but still two sets of oil cylinders are used to respectively drive the inner mold and the outer mold to complete the pipe orifice, and the problem of the parallel-bar horizontal oil press cannot be solved.

Disclosure of Invention

The invention aims to provide a die which can realize pipe orifice rounding based on independent power equipment.

The invention solves the technical problems through the following technical scheme: a round tube rounding die comprises a flaring die and a necking die which are coaxially sleeved, wherein a tube opening can be inserted between the flaring die and the necking die; a conical core rod with an outer conical surface is sleeved in an inner conical surface of the flaring die; a cover opening die with an inner conical surface is sleeved outside the outer conical surface of the necking die;

the oil cylinder is characterized by further comprising a baffle which is coaxially matched with the conical core rod, the baffle is arranged on one side, away from the cover neck ring, of the neck ring and is in axial butt joint with the neck ring, one end, away from the cover neck ring, of the conical core rod is fixedly matched with the output end of the oil cylinder, and the output end of the oil cylinder is in butt joint with the end, away from the cover neck ring, of the baffle.

The invention simultaneously acts on the tapered core rod and the necking die through the oil cylinder, the necking die expands and expands through the relative motion of the tapered core rod and the necking die, and the necking die contracts outside the pipe orifice through the relative motion of the necking die and the cover orifice die, thereby realizing the purpose of the whole circle of the pipe orifice.

Preferably, at least two guide pins fixedly matched with the cover opening die are further fixed on the baffle along the circumferential direction, the baffle can be in sliding fit with the guide pins along the axial direction, and a spring positioned between the baffle and the cover opening die is sleeved on the guide pins.

Preferably, the tapered core rod comprises a tapered section and a flat section, the flat section is inserted into a core rod sleeve, the baffle sleeve is arranged on the outer side of the core rod sleeve, and the output end of the oil cylinder is fixedly matched with the core rod sleeve.

Preferably, the one end that the hydro-cylinder was kept away from to the plug cover is provided with along the radial evagination limiting plate, be provided with in the baffle with limiting plate sliding fit's slip chamber, the one end that the slip chamber is close to the hydro-cylinder is provided with the end cover, end cover and plug cover transition fit.

Preferably, one end of the mandrel sleeve, which is close to the oil cylinder, is also provided with a mandrel seat, and a fixing bolt which penetrates through the mandrel sleeve and is connected with the conical mandrel is axially arranged on the mandrel seat.

Preferably, the output end of the oil cylinder is fixedly connected with a connecting block, the connecting block is abutted to the end face of the mandrel base, the connecting block further comprises a top block located on the side face of the mandrel base, and the top block can be axially abutted to the end cover.

Preferably, the diameter of the mandrel base is larger than that of the mandrel sleeve, the side face of the ejector block is in adaptive contact fit with the side faces of the mandrel base and the mandrel sleeve, and when the oil cylinder does not work, a gap is formed between the end face of the ejector block and the end cover.

Preferably, the flaring die comprises eight flaring fan-shaped petals, and the necking die comprises eight necking fan-shaped petals.

Preferably, the outer side of the flaring die is provided with an elastic ring hooped outside the flaring die.

Preferably, the elastic ring is arranged at one end of the flaring die close to the baffle, and the elastic ring is made of polyurethane.

The round pipe rounding die provided by the invention has the advantages that: the oil cylinder acts on the conical core rod and the necking die simultaneously, the flaring die expands due to relative motion of the conical core rod and the flaring die, the necking die contracts outside the pipe orifice due to relative motion of the necking die and the cover opening die, the purpose of rounding the pipe orifice is realized, only one oil cylinder or a similar linear driving assembly is needed for driving, the equipment cost is reduced, the problem of stroke debugging of multiple oil cylinders is not needed to be considered, and the diameter of the pipe orifice after rounding is ensured to meet the design requirement. The necking die can automatically reset through the cooperation of the guide pin and the spring, the fixed cooperation of the oil cylinder output end and the conical core rod is realized through the cooperation of the connecting block, the core rod seat and the core rod sleeve, the conical core rod can change the position along the axial direction along with the action of the oil cylinder output end, the flaring die can automatically retract and reset through the elastic ring, and the use is convenient.

Drawings

FIG. 1 is a cross-sectional view of a round tube rounding die according to an embodiment of the present invention;

fig. 2 is an exploded view of a round tube rounding die according to an embodiment of the present invention;

fig. 3 is a schematic view of the combination of the flaring die and the necking die of the round pipe round die provided by the embodiment of the invention;

fig. 4 is a schematic driving structure diagram of a flaring die of a round tube rounding die according to an embodiment of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below in detail and completely with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

With reference to fig. 1 and fig. 2, the embodiment provides a circular tube rounding die, which includes a flaring die 5 and a necking die 4 coaxially sleeved, wherein a tube opening of a circular tube can be inserted between the flaring die 5 and the necking die 4, a tapered core rod 9 having an outer conical surface is sleeved in an inner conical surface of the flaring die 5, a cover opening die 1 having an inner conical surface is sleeved outside an outer conical surface of the necking die 4, and an inclination direction of the tapered core rod 9 is the same as an inclination direction of the necking die 4; the device is characterized by further comprising a baffle 6 coaxially matched with the tapered core rod 9, the baffle 6 is arranged on one side, away from the cover neck ring mold 1, of the neck ring mold 4 and is in axial butt joint with the neck ring mold 4, one end, away from the cover neck ring mold 1, of the tapered core rod 9 is fixedly matched with the output end of the oil cylinder, and the output end of the oil cylinder is in butt joint with the end, away from the cover neck ring mold 5, of the baffle 6.

This embodiment acts on toper plug 9 and necking die 4 simultaneously through the hydro-cylinder, relative motion through toper plug 9 and necking die 5 makes the inflation of flaring die 5 internal expanding, make necking die 4 shrink in the mouth of pipe outside through necking die 4 and the 1 relative motion of cover bush simultaneously, realize the mesh that the mouth of pipe is whole round, only need an hydro-cylinder or similar sharp drive assembly drive, reduce equipment cost, need not consider the problem of many hydro-cylinders stroke debugging, ensure that the mouth of pipe diameter after the whole round accords with the design requirement.

At least two guide pins 11 fixedly matched with the cover opening die 1 are further fixed on the baffle 6 along the circumferential direction, the baffle 6 can slide relative to the guide pins 11 along the axial direction, and a spring 13 positioned between the baffle 6 and the cover opening die 1 is sleeved on the guide pins 11, so that after the whole circle is machined, the baffle 6 is driven by the spring 13 to automatically keep away from the cover opening die 1, and the necking die 4 returns to a natural state. In this embodiment, 8 guide pins 11 are provided along the circumferential direction of the shutter 6.

Referring to fig. 1, the tapered mandrel 9 includes a tapered section and a straight section, the tapered section moves axially relative to the flaring die 5 by pushing the straight section to expand the flaring die 5, the straight section is inserted into a mandrel sleeve 7, the baffle 6 is sleeved outside the mandrel sleeve 7, and the output end of the oil cylinder is fixedly matched with the mandrel sleeve 7; specifically, the one end that the hydro-cylinder was kept away from to mandrel cover 7 is provided with along radially outward protruding limiting plate 71, be provided with in the baffle 6 with limiting plate 71 sliding fit's slip chamber 61, the one end that slip chamber 61 is close to the hydro-cylinder is provided with end cover 62, end cover 62 and mandrel cover 7 transition fit, mandrel cover 7 can pass end cover 62 and freely slide to realize sliding spacing through limiting plate 71 and end cover 62.

A mandrel seat 8 is further arranged at one end, close to the oil cylinder, of the mandrel sleeve 7, and a fixing bolt (not shown) penetrating through the mandrel sleeve 7 and connected with a straight section of the conical mandrel 9 is axially arranged on the mandrel seat 8, so that the mandrel seat 8, the mandrel sleeve 7 and the conical mandrel 9 are fixed together; the output fixedly connected with connecting block 3 of hydro-cylinder, the terminal surface butt of connecting block 3 and mandrel seat 8, connecting block 3 still include the kicking block 31 that is in 8 sides of mandrel seat, kicking block 31 can follow axial butt with end cover 62 to through the axial motion of connecting block 3, drive mandrel seat 8 and baffle 6 simultaneously along axial motion, realize synchronous interior expanding and external contracting.

With reference to fig. 2, 3 and 4, the diameter of the mandrel holder 8 is larger than that of the mandrel sleeve 7, the side surface of the top block 31 is in adaptive contact fit with the side surfaces of the mandrel holder 8 and the mandrel sleeve 7, so that the mandrel holder 8 is in a groove, and the mandrel holder 8 is fixedly matched with the connecting block 3, so that the mandrel holder 8 can be pushed or pulled by the connecting block 3; when the oil cylinder does not extend out for work, a gap is reserved between the end face of the jacking block 31 and the end cover 62, so that the connecting block 3 pushes the conical core rod 9 to move to jack the flaring die 5, the pipe orifice is expanded, and then the pipe orifice is rounded through the necking die 4.

Referring to fig. 3, the connecting block 3 may be provided with a receiving groove on one side surface thereof, so that the mandrel holder 8 and the mandrel sleeve 7 can be fixed in the receiving groove, and the other part of the side surface of the receiving groove is used as a top block 31 to drive the baffle 6 to move axially.

Referring to fig. 4, the flaring die 5 includes eight flaring fan-shaped petals, the necking die 4 includes eight necking fan-shaped petals, and the specific structures of the flaring die 4 and the necking die 4 can refer to the prior art, and the structures of the flaring die 5 and the necking die 4 are not improved in this embodiment.

Further, an elastic ring 10 hooped outside the flaring die 5 is further provided outside the flaring die 5, the elastic ring 10 is provided at one end of the flaring die 5 close to the baffle 6, and the elastic ring 10 is made of polyurethane, so that after the tapered mandrel 9 leaves the flaring die 5 in the axial direction, the flaring die can be automatically contracted through the elastic ring 10.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.