阅读说明：本技术 一种复合式阀芯冷压成型工装及成型工艺 (Combined type valve core cold press molding tool and molding process ) 是由 杨生旭 郭叶 赵飞 徐鸿翔 吴平 梁懿 王�华 李彧 于 2021-07-30 设计创作，主要内容包括：本发明提供了一种复合式阀芯冷压成型工装及成型工艺,所述成型工装包括底座、紧固套、导向柱、压杆和弹簧；成型时,将复合式阀芯的零件进行组装；对紧固件采用收口或者销钉固定；将组装后的复合式阀芯置于底座的内腔,阀芯基体的长柱状导向杆插入基座的小孔中；将紧固套套设在复合式阀芯外,并与基座的内圆螺纹连接；将压杆的小端插入紧固套的小孔中,与阀芯塑料密封环的上表面接触；将导向柱置于压杆的内腔中,然后在压杆的内腔中再插入弹簧,顶住导向柱；对复合式阀芯的塑料密封环进行保压,使塑料充分受压,在限定范围内充分变形；对阀芯表面进行机械加工,保证密封面平整。本发明有效实现了复合式阀芯的软密封结构制造,保证密封性能良好。(The invention provides a combined type valve core cold press molding tool and a molding process, wherein the molding tool comprises a base, a fastening sleeve, a guide post, a compression bar and a spring; assembling parts of the composite valve core during molding; closing up or fixing the fastener by pins; the assembled composite valve core is arranged in the inner cavity of the base, and the long columnar guide rod of the valve core base body is inserted into the small hole of the base; sleeving the fastening sleeve outside the combined type valve core and connecting the fastening sleeve with the inner circle of the base through threads; inserting the small end of the pressure lever into the small hole of the fastening sleeve, and contacting the small end of the pressure lever with the upper surface of the valve core plastic sealing ring; placing the guide post in the inner cavity of the pressure lever, and then inserting a spring in the inner cavity of the pressure lever to prop against the guide post; maintaining the pressure of the plastic sealing ring of the combined valve core to ensure that the plastic is fully pressed and fully deformed within a limited range; and the surface of the valve core is machined, so that the flatness of a sealing surface is ensured. The invention effectively realizes the manufacture of the soft sealing structure of the combined type valve core and ensures good sealing performance.)

1. The combined type valve core cold press molding tool is characterized by comprising a valve core base body (71), a fastener (72) and a plastic sealing ring (73), wherein the small end of the valve core base body (71) is a long columnar guide rod, the large end of the valve core base body is of a step block structure, the plastic sealing ring (73) is pressed on the large end of the valve core base body (71), the position is limited through the corresponding step surface, and the height of the plastic sealing ring (73) is higher than the end face of the large end of the valve core base body (71) after installation; the fastener (72) is pressed on the large end of the valve core base body (71) and is coated with a plastic sealing ring (73);

the forming tool comprises a base (1), a fastening sleeve (2), a guide post (3), a pressure lever (4) and a spring (5); the inner cavity of the base (1) is of a stepped hole structure, the diameter of a small hole is larger than that of a long columnar guide rod of the valve core base body (71) and used for accommodating the long columnar guide rod of the valve core base body (71), and a large hole is a threaded hole and is in threaded connection with the outer circle of the fastening sleeve (2) and used for fixing the composite valve core;

the inner cavity of the fastening sleeve (2) is of a stepped hole structure, the diameter of a large hole is larger than the maximum excircle diameter of the combined valve core, and the diameter of a small hole is larger than the outer diameter of the plastic sealing ring (73) of the combined valve core and smaller than the outer diameter of the fastening piece (72) and is used for wrapping the excircle of the plastic sealing ring (73);

the guide column (3) is cylindrical, the diameter of the excircle of the guide column is smaller than the inner diameter of the valve core plastic sealing ring (73), and the lower end of the guide column is arranged in an inner hole of the plastic sealing ring (73);

the pressure lever (4) is of a hollow step-like structure, the inner cavity of the pressure lever is a longitudinal through hole, the guide post (3) is arranged in the longitudinal through hole, the inner diameter and the outer diameter of the small end of the pressure lever (4) are consistent with the inner diameter and the outer diameter of the valve core plastic sealing ring (73) and are in contact with the upper surface of the valve core plastic sealing ring (73), and the large end of the pressure lever is a stress surface of a press machine and is used for applying pressure to a plastic surface by means of the press machine;

the lower part of the spring (5) is positioned in the inner cavity of the pressure rod (4), the lower end of the spring is in contact with the upper surface of the guide column (3), the upper end of the spring is a stress surface of the press machine, the length of the spring is greater than the difference between the total length of the guide column (3) and the total length of the pressure rod (4), and the spring is used for pressing the guide column (3).

2. The composite valve core cold press molding tool according to claim 1, wherein a large hole opening of the base (1) is of a conical surface structure.

3. The composite valve core cold press molding tool according to claim 1, wherein the height of the fastening sleeve (2) is greater than, less than or equal to the height of the large hole of the base (1), preferably the height of the fastening sleeve (2) is greater than the height of the large hole of the base (1).

4. The composite valve core cold press molding tool according to claim 1, wherein the diameter of the small hole of the fastening sleeve (2) is 0.05-0.15mm larger than the outer diameter of the composite valve core plastic sealing ring (73).

5. The composite valve core cold press molding tool according to claim 1, wherein the diameter of the outer circle of the guide column (3) is 0.05-0.15mm smaller than the inner diameter of the valve core plastic sealing ring (73).

6. The composite valve core cold press molding tool according to claim 1, wherein the circular edges at two ends of the guide column (3) are sharp edges.

7. The composite valve core cold press molding tool according to claim 1, wherein the length of the spring (5) is 1.5-2 times of the difference between the total length of the guide post (3) and the total length of the pressure rod (4).

8. A cold press molding process of a composite valve core is characterized by comprising the following steps:

step 1), assembling parts of the composite valve core, namely press-fitting a plastic sealing ring (73) on the large end of a valve core base body (71), limiting through a corresponding step surface, press-fitting a fastener (72) on the valve core base body (71) to coat the plastic sealing ring (73), wherein the height of the plastic sealing ring (73) is higher than the end surface of the large end of the valve core base body (71) after installation;

step 2), adopting a closing-in or a pin for fixing the fastener (72), and selecting to roll and press a thin wall at one end of the fastener (71) according to the structural characteristics of the composite valve core to enable the thin wall to be closely attached to the valve core base body (71) or directly connecting the fastener (72) and the valve core base body (71) by using the pin to prevent the fastener (72) from relatively moving or rotating;

step 3), placing the assembled composite valve core in an inner cavity of the base (1), and inserting a long columnar guide rod of the valve core base body (71) into a small hole of the base (1); sleeving the fastening sleeve (2) outside the composite valve core and connecting the fastening sleeve with the inner circle of the base (1) in a threaded manner; the small end of the pressure lever (4) is inserted into the small hole of the fastening sleeve (2) and contacts with the upper surface of the valve core plastic sealing ring (73); the guide post (3) is arranged in the inner cavity of the pressure lever (4), and then the spring (5) is inserted into the inner cavity of the pressure lever (4) to prop against the guide post (3);

step 4), maintaining the pressure of the plastic sealing ring (73) of the composite valve core, so that the plastic sealing ring (73) of the valve core is fully pressed and fully deformed in a limited range, and a 60-degree annular sealing groove on the substrate is fully filled;

and 5), machining the surface of the valve core to ensure that the sealing surface is flat.

9. The cold press molding process of the composite valve core according to claim 8, wherein in the step 4), the pressurizing speed is not more than 1mm/min, and the dwell time is 10min to 15 min.

10. The cold press molding process of a composite valve core according to claim 8, wherein in the step 5), the machining is carried out by adopting a feed mode of feeding the non-metal surface of the plastic sealing ring (73) to the metal surfaces of the valve core base body (71) and the fastener (72) on both sides.

Technical Field

The invention belongs to the technical field of machining, and particularly relates to a combined type valve core cold press molding tool and a molding process.

Background

The composite valve core is a soft sealing type valve core formed by multiple parts, the sealing reliability in a liquid rocket engine is high, the application range is wide, and the valve core with the structure is adopted by multiple automatic devices to ensure the reliable functions of the automatic devices. The sealing material of the soft sealing structure has certain elasticity, and compared with a hard sealing structure, the sealing performance is better, and the quality guarantee of aerospace products is facilitated. However, in the forming process of the composite valve core, the non-metal material is plastically deformed to fill the 60-degree sealing groove on the base body, and the filling quality of the non-metal material of the valve core is influenced by the forming process and the auxiliary tool in the forming process. Improper design of the forming process can cause failure of fastening parts, sudden pressure release and failure of cold molding of the valve core. The unreasonable design of auxiliary fixtures can cause pressure diffusion, and plastic shearing and tearing phenomena can also occur mostly, so that the mechanical property of the nonmetal sealing element is seriously influenced. The valve core cold press forming process is high in difficulty, multiple parameters need to be comprehensively controlled, reasonable auxiliary tools and process flows need to be designed, and the one-time inspection qualified rate of the composite soft sealing structure can be guaranteed only by means of tight control in multiple aspects.

Disclosure of Invention

In order to overcome the defects in the prior art, the inventor of the invention carries out intensive research, provides a cold press molding tool and a cold press molding process for a composite valve core of a liquid rocket engine, solves the technical problem that a plastic sealing ring of the composite valve core fully fills a sealing cavity to be tightly attached to metal through plastic deformation in a limited range, effectively realizes the manufacturing of a soft sealing structure of the composite valve core, and ensures good sealing performance, thereby completing the invention.

The technical scheme provided by the invention is as follows:

the first aspect is that the combined type valve core cold press molding tool comprises a valve core base body, a fastener and a plastic sealing ring, wherein the small end of the valve core base body is a long columnar guide rod, the large end of the valve core base body is of a step block structure, the plastic sealing ring is pressed and installed at the large end of the valve core base body, the plastic sealing ring is limited by a corresponding step surface, and the height of the plastic sealing ring is higher than the end face of the large end of the valve core base body after installation; the fastening piece is pressed on the large end of the valve core base body and wraps the plastic sealing ring;

the forming tool comprises a base, a fastening sleeve, a guide post, a pressure rod and a spring; the inner cavity of the base is of a stepped hole structure, the diameter of a small hole is larger than that of a long columnar guide rod of the valve core base body and is used for accommodating the long columnar guide rod of the valve core base body, and a large hole is a threaded hole and is in threaded connection with the outer circle of the fastening sleeve and is used for fixing the combined valve core;

the inner cavity of the fastening sleeve is of a stepped hole structure, the diameter of a large hole is larger than the diameter of the maximum outer circle of the combined type valve core, and the diameter of a small hole is larger than the outer diameter of the plastic sealing ring of the combined type valve core and smaller than the outer diameter of the fastening piece and is used for wrapping the outer circle of the plastic sealing ring;

the guide post is cylindrical, the diameter of the outer circle of the guide post is smaller than the inner diameter of the valve core plastic sealing ring, and the lower end of the guide post is arranged in an inner hole of the plastic sealing ring;

the pressure lever is of a hollow step-like structure, the inner cavity of the pressure lever is a longitudinal through hole, the guide post is arranged in the longitudinal through hole, the inner diameter and the outer diameter of the small end of the pressure lever are consistent with the inner diameter and the outer diameter of the valve core plastic sealing ring and are in contact with the upper surface of the valve core plastic sealing ring, and the large end of the pressure lever is a stress surface of a press machine and is used for applying pressure to a plastic surface by means of the press machine;

the lower part of the spring is positioned in the inner cavity of the pressure rod, the lower end of the spring is in contact with the upper surface of the guide column, the upper end of the spring is a stress surface of the press machine, the length of the stress surface is greater than the difference between the total length of the guide column and the total length of the pressure rod, and the stress surface is used for pressing the guide column.

In a second aspect, a cold press molding process for a composite valve core comprises the following steps:

step 1), assembling parts of the composite valve core, namely firstly pressing and mounting a plastic sealing ring on the large end of a valve core base body, limiting through a corresponding step surface, then pressing and mounting a fastener on the valve core base body, and coating the plastic sealing ring, wherein the height of the plastic sealing ring is higher than the end surface of the large end of the valve core base body after mounting;

step 2), adopting a closing-in or a pin for fixing the fastener, and selecting and rolling a thin wall at one end of the fastener according to the structural characteristics of the composite valve core to enable the thin wall to be closely attached to the valve core base body or directly connecting the fastener with the valve core base body by using the pin to prevent the fastener from relatively moving or rotating;

step 3), placing the assembled composite valve core in an inner cavity of a base, and inserting a long columnar guide rod of a valve core base body into a small hole of the base; sleeving the fastening sleeve outside the combined type valve core and connecting the fastening sleeve with the inner circle of the base through threads; inserting the small end of the pressure lever into the small hole of the fastening sleeve, and contacting the small end of the pressure lever with the upper surface of the valve core plastic sealing ring; placing the guide post in the inner cavity of the pressure lever, and then inserting a spring in the inner cavity of the pressure lever to prop against the guide post;

step 4), maintaining the pressure of the plastic sealing ring of the composite valve core to ensure that the plastic sealing ring of the valve core is fully pressed and fully deformed within a limited range to fully fill a 60-degree annular sealing groove on the base body;

and 5), machining the surface of the valve core to ensure that the sealing surface is flat.

According to the combined type valve core cold press molding tool and the molding process provided by the invention, the combined type valve core cold press molding tool has the following beneficial effects:

(1) according to the cold press molding tool and the molding process for the composite valve core, plastic deformation of plastic is realized without adopting a hot pressing mode, and the plastic heating cost is reduced;

(2) according to the cold press molding tool and the molding process for the combined type valve core, the plastic sealing ring is pressurized by the pressure rod, and is limited by the fastening sleeve and the guide column, so that the pressure effectiveness is improved, and the filling rate of plastic deformation is high;

(3) according to the combined type valve core cold press molding tool and the molding process, the fastening sleeve and the guide post are designed and matched with other structural members, so that the process method provided by the invention avoids the problems of failure of fastening parts, sudden pressure release and failure of cold molding of the valve core caused by unreasonable design of the traditional process method, and the tool is reasonable in design, and can not generate the problems of pressure diffusion, plastic shearing and tearing phenomena and serious influence on the mechanical property of a nonmetal sealing element caused by unreasonable design of the traditional tool;

(4) according to the cold press molding tool and the molding process for the combined type valve core, the surface of the combined type valve core is processed after cold pressing is finished, and the flow direction of metal scrap iron can be effectively controlled by feeding the combined type valve core from the non-metal surface of the plastic sealing ring to the metal surfaces of the valve core base bodies and the fastening pieces on the two sides, so that the non-metal is prevented from being damaged.

Drawings

FIG. 1 is a schematic structural view of a composite valve core cold press molding tool of the present invention;

FIG. 2 is a base structure diagram of the composite valve core cold press molding tool of the present invention;

FIG. 3 is a structural diagram of a fastening sleeve of the composite valve core cold press molding tool of the invention;

FIG. 4 is a structural diagram of a guide post of the composite valve core cold press molding tool of the invention;

FIG. 5 is a structure diagram of a pressure lever of the composite valve core cold press molding tool of the invention;

FIG. 6 is a schematic structural view of a composite valve cartridge according to the present invention;

fig. 7 is a schematic view of the valve core surface machining mode according to the present invention.

Description of the reference numerals

1-a base; 2-fastening sleeve; 3-a guide post; 4-a pressure bar; 5-a spring; 6-a compound valve core; 71-a valve core base body; 72-a fastener; 73-plastic sealing ring.

Detailed Description

The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

According to the first aspect of the invention, a composite valve core cold press molding tool is provided, the composite valve core comprises a valve core base body 71, a fastener 72 and a plastic sealing ring 73, as shown in fig. 1 and fig. 6, the valve core base body 71 is of a T-shaped structure, the small end of the valve core base body is a long columnar guide rod, the large end of the valve core base body is of a step block structure, the plastic sealing ring 73 is pressed on the large end of the valve core base body 71, the valve core base body is limited by a corresponding step surface, a 60-degree annular sealing groove is processed on the step surface, and the height of the plastic sealing ring 73 is higher than the end surface of the large end of the valve core base body 71 after installation, and is preferably higher by 1-1.5 mm; the fastener 72 is pressed on the large end of the valve core base body 71 and is coated with a plastic sealing ring 73;

as shown in fig. 1, the forming tool comprises a base 1, a fastening sleeve 2, a guide post 3, a pressure lever 4 and a spring 5; as shown in fig. 2, the inner cavity of the base 1 is of a stepped hole structure, the diameter of a small hole is slightly larger than that of a long columnar guide rod of the valve core base body 71, the small hole is used for accommodating the long columnar guide rod of the valve core base body 71, and a large hole is a threaded hole and is in threaded connection with the outer circle of the fastening sleeve 2, and is used for fixing the composite valve core;

as shown in fig. 3, the inner cavity of the fastening sleeve 2 is also of a stepped hole structure, the diameter of a large hole is slightly larger than the diameter of the maximum outer circle of the composite valve core, the diameter of a small hole is larger than the outer diameter of the plastic sealing ring 73 of the composite valve core and smaller than the outer diameter of the fastening piece 72, and preferably, the diameter of the small hole is 0.05-0.15mm larger than the outer diameter of the plastic sealing ring 73 of the composite valve core, so that the outer circle of the plastic sealing ring 73 is wrapped, and the plastic sealing ring 73 is prevented from being pressed to deform outwards;

as shown in fig. 4, the guide post 3 is a cylinder, the diameter of the outer circle is smaller than the inner diameter of the valve core plastic sealing ring 73, preferably, the diameter of the outer circle is 0.05-0.15mm smaller than the inner diameter of the valve core plastic sealing ring 73, and the guide post is placed in the inner hole of the plastic sealing ring 73 to prevent the plastic sealing ring 73 from being pressed to deform inwards;

as shown in fig. 5, the pressure lever 4 is a hollow step-like structure, the inner cavity is a longitudinal through hole, the guide post 3 is arranged in the longitudinal through hole, the inner and outer diameters of the small end of the pressure lever 4 are consistent with the inner and outer diameters of the valve core plastic sealing ring 73 and are in contact with the upper surface of the valve core plastic sealing ring 73, the large end is a stress surface of a press, the outer diameter has no specific size requirement, and the pressure lever is used for applying pressure to a plastic surface by means of the press;

as shown in fig. 1, the lower part of the spring 5 is located in the inner cavity of the compression bar 4, the lower end of the spring is in contact with the upper surface of the guide post 3, the upper end of the spring is a stress surface of the press, the outer diameter of the spring is smaller than the inner diameter of the compression bar 4, the length of the spring is larger than the difference between the total length of the guide post 3 and the total length of the compression bar 4, preferably, the length of the spring is 1.5-2 times of the difference between the total length of the guide post 3 and the total length of the compression bar 4, and the spring has the function of pressing the guide post 3 and preventing the guide post 3 from being ejected out when plastic deforms.

In a preferred embodiment, the large hole opening of the base 1 is of a conical surface structure, so that the fastening sleeve 2 is convenient to be matched with the base 1.

In a preferred embodiment, the height of the fastening sleeve 2 is greater than, less than or equal to the height of the large hole of the base 1, and preferably, the height of the fastening sleeve 2 is greater than the height of the large hole of the base 1, so that the fastening sleeve 2 can be conveniently mounted and dismounted.

In a preferred embodiment, the rounded edges at both ends of the guide post 3 are sharp edges, and no chamfer is allowed.

In a preferred embodiment, the spring 5 is a compression spring having a diameter no less than 1/2 of the diameter of the guide post 3.

According to a second aspect of the invention, a composite valve core cold press molding process is provided, which comprises the following steps:

(1) assembling the parts of the composite valve core, namely pressing the plastic sealing ring 73 on the large end of the valve core base body 71, limiting through the corresponding step surface, pressing the fastening piece 72 on the valve core base body 71 to coat the plastic sealing ring 73, wherein the height of the plastic sealing ring 73 is 1-1.5 mm higher than the end surface of the large end of the valve core base body 71 after installation;

(2) the fastener 72 is fixed by adopting a closing-in or a pin, and according to the structural characteristics of the composite valve core, the thin wall at one end of the rolling fastener 71 is selected to be closely attached to the valve core base body 71 or the fastener 72 is directly connected with the valve core base body 71 by using the pin, so that the fastener 72 is prevented from relatively moving or rotating;

(3) the assembled composite valve core is arranged in the inner cavity of the base 1, and the long columnar guide rod of the valve core base body 71 is inserted into the small hole of the base 1; sleeving the fastening sleeve 2 outside the composite valve core and connecting the fastening sleeve with the inner circle of the base 1 through threads; the small end of the pressure lever 4 is inserted into the small hole of the fastening sleeve 2 and contacts with the upper surface of the valve core plastic sealing ring 73; placing the guide post 3 in the inner cavity of the pressure lever 4, and then inserting the spring 5 in the inner cavity of the pressure lever 4 to prop against the guide post 3;

(4) maintaining the pressure of the plastic sealing ring 73 of the composite valve core, so that the plastic sealing ring 73 of the valve core is fully pressed and fully deformed in a limited range, and a 60-degree annular sealing groove on the base body is fully filled; the pressurizing pressure value is calculated according to the stress area of the plastic sealing ring 73, the pressurizing speed is not more than 1mm/min, the pressure maintaining time is calculated according to the stress area of the plastic sealing ring 73, and the optimal time is 10-15 min;

research shows that the pressurizing speed is not more than 1mm/min, the plastic sealing ring can be basically ensured not to be damaged by pressure, and if the pressurizing speed is more than 1mm/min, the plastic sealing ring can be fractured or the guide post 3 can be jacked upwards.

(5) The surfaces of the valve core are machined to ensure that the sealing surfaces are flat, and the machining is preferably carried out by adopting a feed mode that the non-metal surface of the plastic sealing ring 73 feeds to the metal surfaces of the valve core base body 71 and the fastening piece 72 on two sides, as shown in fig. 7.

Examples

Example 1

A cold press forming process for a composite valve core in valves of a blowing system and a fuel system in a liquid rocket engine comprises the following steps:

(1) assembling the parts of the composite valve core, namely pressing the plastic sealing ring 73 on the large end of the valve core base body 71, limiting through the corresponding step surface, pressing the fastening piece 72 on the valve core base body 71, and coating the plastic sealing ring 73; the height of the plastic sealing ring 73 is 1mm higher than the end face of the large end of the valve core base body 71 after installation;

(2) after the parts of the composite valve core are assembled, the fastener 72 is fixed in a closing-up mode, and the thin wall at the left end of the fastener is rolled to be closely attached to the valve core base body so as to be fixed (see fig. 6);

(3) the assembled composite valve core is arranged in the inner cavity of the base 1, and the long columnar guide rod of the valve core base body 71 is inserted into the small hole of the base 1; sleeving the fastening sleeve 2 outside the composite valve core and connecting the fastening sleeve with the inner circle of the base 1 through threads; the small end of the pressure lever 4 is inserted into the small hole of the fastening sleeve 2 and contacts with the upper surface of the valve core plastic sealing ring 73; placing the guide post 3 in the inner cavity of the pressure lever 4, and then inserting the spring 5 in the inner cavity of the pressure lever 4 to prop against the guide post 3;

(4) the plastic sealing ring 73 of the composite valve core is subjected to pressure maintaining, so that the plastic is fully pressed and fully deformed in a limited range, a 60-degree annular sealing groove on the base body is fully filled, and the stress area of the plastic sealing ring 73 is 40.3mm²The pressure value F is 6000N, the pressure speed is 1mm/min, and the pressure maintaining time is 10 min;

(5) and (3) machining the surface of the valve core to ensure that the sealing surface is flat, and carrying out machining by adopting a feed mode of feeding from a non-metal surface to a metal surface.

The composite valve core processed by the process has the advantages of good sealing surface quality, no defects of tearing, breakage and the like which influence use, good sealing performance and capability of meeting sealing requirements in the industry. And (4) carrying out sectioning inspection on the valve core, and filling 60-degree annular sealing grooves on the base body fully.

The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.

Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.