CN213495709U

CN213495709U - Manufacturing die for extruding piston pin hole copper bush

Info

Publication number: CN213495709U
Application number: CN202021762172.XU
Authority: CN
Inventors: 张将; 朱鸿磊; 洪晓露; 徐英; 刘永强; 彭银江; 陈大辉; 侯林冲
Original assignee: China Weapon Science Academy Ningbo Branch
Current assignee: China Weapon Science Academy Ningbo Branch
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2021-06-22
Anticipated expiration: 2030-08-21

Abstract

The utility model provides an extrusion piston pinhole copper bush preparation mould, include from last top board that sets gradually extremely down, go up the mould pressure head, external mold and die block, the cavity of being convenient for piston pinhole copper bush drawing of patterns and taking out is seted up at the central point of die block, the external mold sets up on the die block, and through extrusion module and die block phase-match, the middle part of external mold runs through and sets up the inner chamber coaxial with the cavity of die block, the intracavity is equipped with the mandrel, piston pin hole copper bush blank cover is established outside the mandrel, go up the upper end and the top board fixed connection of mould pressure head, the lower extreme setting of mould pressure head offsets with the upper end of mandrel. Has the advantages that: the arrangement of the core mold can improve the extrusion deformation of the copper bush, and greatly improve the strength and the wear resistance of the copper bush; the upper die pressing head and the extrusion module are arranged to facilitate demoulding and taking out, so that the copper bush blank is quickly formed under the pressure action of the upper die pressing head to realize near-net forming; has the characteristics of simple and reasonable structure, high efficiency and low manufacturing cost.

Description

Manufacturing die for extruding piston pin hole copper bush

Technical Field

The utility model relates to a mould structure especially relates to a preparation mould of piston pin hole copper bush.

Background

The piston pin hole bushing material is silicon brass CuZn31Si1, and the main components of the material comprise (weight percent): 28.5 to 33.3%, silicon: 0.7-1.3%, lead: 0.1-0.3%, nickel: 0.3-0.6%, iron: 0.3-0.5 percent of copper and inevitable impurities in balance, and the content of the impurities is less than or equal to 0.1 percent. The silicon brass CuZn31Si1 has excellent mechanical properties, good wear resistance, good processability and other excellent properties.

Pin boss fatigue cracking is one of the typical failure modes of a piston. The improvement of the highest combustion pressure of the high-power density diesel engine piston enables the fatigue load borne by the pin seat to be obviously increased, the fatigue loading frequency of the pin seat is obviously increased due to high rotating speed, and the fatigue failure probability is greatly improved. The fatigue failure problem of the pin boss cannot be completely solved by only improving the performance of the piston alloy, and a local strengthening technology is required; the high-strength copper alloy bushing embedding strengthening technology is characterized in that a silicon brass pin hole bushing is embedded in a piston pin hole, so that the wear resistance of the piston pin hole and the wear resistance of the connecting rod are improved, and the service life of the piston is greatly prolonged. Silicon brass pin bore liner reinforcements have been widely used in key parts of piston engines.

The existing silicon brass piston pin hole bushing in China adopts a mode of firstly extruding and then machining, a silicon brass pin hole blank is formed by adopting a solid extrusion die, the whole deformation of the blank is smaller, and the deformation of each part is different; the quality of the forming quality of the silicon brass CuZn31Si1 piston pin hole bushing is one of the key factors for enhancing the performance of the piston pin hole. The method for manufacturing the piston pin hole copper bush is that a piston pin hole copper bush blank is obtained by extrusion, and then the required bush is obtained by heat treatment and machining. The piston pin hole copper bush manufactured in this way has a long manufacturing cycle, a large amount of processing but a small amount of deformation, high manufacturing cost, and difficulty in meeting the requirements under mass production conditions.

The existing piston pin hole copper bush manufacturing die has relatively small deformation in the extrusion process, and needs to be processed again and thermally treated after extrusion, so that a product is finally obtained. The copper bush with the plug pin hole manufactured by the die has the advantages of low forming efficiency, poor performance and high manufacturing cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a extrusion piston pinhole copper bush preparation mould that simple structure is reasonable, the shaping is efficient, with low costs is provided.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides an extrusion piston pin hole copper bush preparation mould which characterized in that: the piston pin hole copper bush demoulding device comprises an upper pressing plate, an upper die pressing head, an outer die and a bottom die, wherein the upper pressing plate, the upper die pressing head, the outer die and the bottom die are sequentially arranged from top to bottom, a cavity convenient for demoulding and taking out of a piston pin hole copper bush is formed in the center of the bottom die, the outer die is arranged on the bottom die and is matched with the bottom die through an extrusion module, an inner cavity coaxial with the cavity of the bottom die is formed in the middle of the outer die in a penetrating mode, a core die is arranged in the inner cavity, a blank sleeve of the piston pin hole copper bush is arranged outside the.

As an improvement, the upper die pressing head is cylindrical, a round hole is formed in the center of the lower end face of the upper pressing plate and is used for being placed into by the upper end of the upper die pressing head, the upper end of the upper die pressing head is inserted into the round hole and is fixedly connected with the upper pressing plate through threads or is fixedly connected through a set screw, and the upper pressing plate is connected with the upper die pressing head to form an upper die part of the die.

And the lower end of the upper die pressure head is in clearance fit with the inner cavity of the outer die, and is in dynamic fit with the outer die, and the fit clearance is 0.05-0.1 mm.

Further, the extrusion module is the round platform structure of middle part fretwork, and the lower terminal surface of external mold has the circular recess that supplies the upper portion of extrusion module to put into around the inner chamber shaping at middle part, and the diameter of circular recess is greater than the cavity diameter of die block, and the lower part shaping of extrusion module is the undergauge round platform with the cavity clearance fit of die block, and the upper portion of extrusion module passes through clearance fit and sets up in the circular recess of external mold, and the lower part of extrusion module passes through clearance fit and sets up in the cavity of die block, and the upper end of die block offsets with the lower extreme of external mold, the step face of extrusion module.

Furthermore, the fit clearance between the extrusion module and the outer die is 0.05-0.1mm, and the fit clearance between the extrusion module and the bottom die is 0.05-0.1 mm.

Furthermore, the diameter of the hollow-out part in the middle of the extrusion module is larger than the outer diameter of the core mold, the diameter of the upper opening at the hollow-out part is larger than that of the lower opening, and the diameter of the upper opening is consistent with that of the inner cavity of the outer mold.

Furthermore, the core mold is cylindrical, the top of the core mold is provided with a circular convex edge extending outwards, the circular convex edge is in transition fit with the piston pin hole copper bush blank, and the fit clearance is-0.02 mm.

Finally, the material of the core die is H13 die steel, and the thermal expansion coefficient of the core die is close to that of silicon brass CuZn31Si 1.

Compared with the prior art, the utility model has the advantages of: the mandrel is arranged in the outer die, the edge of the top of the mandrel is provided with a convex round table and is in transition fit with the copper bush blank, so that the extrusion deformation of the copper bush can be improved, the strength and the wear resistance of the copper bush can be greatly improved, and the inner diameter size of the copper bush of the piston pin hole after extrusion is ensured; the structural design of the upper die pressing head and the arrangement of the extrusion module are convenient for demoulding and taking out, so that the copper bush blank is quickly formed under the pressure action of the upper die pressing head, the near net shape is realized, and the outer diameter dimension is controlled by the extrusion module and the bottom die. The utility model has the advantages of simple and reasonable structure, the shaping is efficient and low in manufacturing cost, has effectively solved that traditional forming process is slow, inconvenient drawing of patterns and take out, and the defect of poor performance greatly shortens processing cycle, can satisfy the needs under the batch production condition.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of the upper mold ram of FIG. 1;

fig. 3 is a schematic structural view of the core mold of fig. 1.

Fig. 4 is a schematic structural view of the extrusion module of fig. 1.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 4, the mold for manufacturing the copper bush for extruding the piston pin hole comprises an upper pressing plate 1, an upper mold pressing head 2, an outer mold 3, a core mold 4, an extruding module 5 and a bottom mold 6, wherein the upper pressing plate 1, the upper mold pressing head 2, the outer mold 3, the extruding module 5 and the bottom mold 6 are sequentially arranged from top to bottom, and the core mold 4 is arranged in an inner cavity of the outer mold 3. The central part of the bottom die 6 is provided with a cavity convenient for demoulding and taking out of the piston pin hole copper bush, the outer die 3 is arranged on the bottom die 6 and is matched with the bottom die 6 through the extrusion module 5, the middle part of the outer die 3 is provided with an inner cavity coaxial with the cavity of the bottom die 6 in a penetrating manner, a blank of the piston pin hole copper bush is sleeved outside the core die 4, the upper end of the upper die pressing head 2 is fixedly connected with the upper pressing plate 1, and the lower end of the upper die pressing head 2 is arranged in the inner cavity of the outer die 3 and is abutted.

The concrete structure is as follows: the upper die pressing head 2 is cylindrical, a round hole is formed in the center of the lower end face of the upper pressing plate 1 and is embedded into the upper end 21 of the upper die pressing head 2, the upper end 21 of the upper die pressing head 2 is inserted into the round hole and is fixedly connected with the upper pressing plate 1 through threads or is fixedly connected through a set screw, and the upper pressing plate 1 and the upper die pressing head 2 are connected to form an upper die part of the die. The lower end 22 of the upper die pressing head 2 is an expanded cylindrical structure which is in clearance fit with the inner cavity of the outer die 3, the lower end 22 of the upper die pressing head is in dynamic fit with the outer die 3, and the fit clearance is 0.05-0.1mm, so that the core die 4 and the piston pin hole copper bush blank can be conveniently placed. The extrusion module 5 is the round platform structure of middle part fretwork, the lower terminal surface of external mold 3 has the circular recess that supplies the upper portion of extrusion module 5 to put into around the inner chamber shaping at middle part, the diameter of circular recess is greater than the cavity diameter of die block 6, the lower part shaping of extrusion module 5 is the undergauge round platform with the cavity clearance fit of die block 6, the upper portion of extrusion module 5 passes through clearance fit and sets up in the circular recess of external mold 3, the lower part of extrusion module 5 passes through clearance fit and sets up in the cavity of die block 6, the upper end of die block 6 and the lower extreme of external mold 3, the step face of extrusion module 5 offsets the cooperation location. The fit clearance between the extrusion module 5 and the outer die 3 is 0.05-0.1mm, and the fit clearance between the extrusion module 5 and the bottom die 6 is 0.05-0.1 mm. The diameter of the hollow in the middle of the extrusion module 5 is larger than the outer diameter of the core mold 4, the diameter of the upper opening at the hollow part is larger than that of the lower opening, and the diameter of the upper opening is consistent with that of the inner cavity of the outer mold 3.

The core die 4 is cylindrical, the top of the core die 4 is provided with a circular convex edge 41 which extends outwards and is in transition with the piston pin hole copper bush blank, and the inner diameter size of the piston pin hole copper bush after extrusion is ensured, and the fit clearance is-0.02 mm. The material of the core mold 4 is H13 die steel, and the thermal expansion coefficient of the H13 die steel is close to that of silicon brass CuZn31Si1, so that the near net shape can be realized while the deformation is improved.

During forming, the upper pressure plate 1 moves downwards, a piston pin hole copper bush blank is quickly formed under the pressure action of the upper die pressing head 2, and the arrangement of the core die 4 can improve the extrusion deformation of the copper bush and greatly improve the strength and the wear resistance of the copper bush; the design of the structure of the upper die pressing head 2 and the arrangement of the additional extrusion module 5 are convenient for demoulding and taking out.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides an extrusion piston pin hole copper bush preparation mould which characterized in that: the piston pin hole copper bush demoulding device comprises an upper pressing plate, an upper die pressing head, an outer die and a bottom die, wherein the upper pressing plate, the upper die pressing head, the outer die and the bottom die are sequentially arranged from top to bottom, a cavity convenient for demoulding and taking out of a piston pin hole copper bush is formed in the center of the bottom die, the outer die is arranged on the bottom die and is matched with the bottom die through an extrusion module, an inner cavity coaxial with the cavity of the bottom die is formed in the middle of the outer die in a penetrating mode, a core die is arranged in the inner cavity, a blank sleeve of the piston pin hole copper bush is arranged outside the.

2. The production mold according to claim 1, wherein: the upper die pressing head is cylindrical, a round hole is formed in the center of the lower end face of the upper pressing plate and is used for being placed into by the upper end of the upper die pressing head, the upper end of the upper die pressing head is inserted into the round hole and is fixedly connected with the upper pressing plate through threads or is fixedly connected through a set screw, and the upper pressing plate and the upper die pressing head are connected to form an upper die part of the die.

3. The production mold according to claim 2, wherein: the lower end of the upper die pressure head is of an expanded diameter cylindrical structure in clearance fit with the inner cavity of the outer die, and the lower end of the upper die pressure head is in dynamic fit with the outer die, and the fit clearance is 0.05-0.1 mm.

4. The production mold according to claim 1, wherein: the extrusion module is the round platform structure of middle part fretwork, and the lower terminal surface of external mold has the circular recess that supplies the upper portion of extrusion module to put into around the inner chamber shaping at middle part, and the diameter of circular recess is greater than the cavity diameter of die block, and the lower part shaping of extrusion module is the undergauge round platform with the cavity clearance fit of die block, and clearance fit setting is passed through in the circular recess of external mold in the upper portion of extrusion module, and clearance fit setting is passed through in the cavity of die block in the lower part of extrusion module, and the upper end of die block offsets with the lower extreme of external mold, the step face of extrusion module.

5. The production mold according to claim 4, wherein: the fit clearance between the extrusion module and the outer die is 0.05-0.1mm, and the fit clearance between the extrusion module and the bottom die is 0.05-0.1 mm.

6. The production mold according to claim 5, wherein: the diameter of the hollow in the middle of the extrusion module is larger than the outer diameter of the core mold, the diameter of the upper opening at the hollow part is larger than that of the lower opening, and the diameter of the upper opening is consistent with that of the inner cavity of the outer mold.

7. The production mold according to claim 1, wherein: the core die is cylindrical, the top of the core die is provided with a circular convex edge extending outwards, the circular convex edge is in transition fit with the piston pin hole copper bush blank, and the fit clearance is-0.02 mm.

8. The production mold according to claim 7, wherein: the material of the core die is H13 die steel, and the thermal expansion coefficient of the core die is close to that of silicon brass CuZn31Si 1.