CN217315870U

CN217315870U - Asymmetric powder metallurgy is mould for gear

Info

Publication number: CN217315870U
Application number: CN202220886319.9U
Authority: CN
Inventors: 高维娜; 张旋; 马华荣; 朱明祥; 刘小青; 葛志林
Original assignee: Porite Yangzhou Technology And Industry Co ltd
Current assignee: Porite Yangzhou Technology And Industry Co ltd
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-08-30
Anticipated expiration: 2032-04-15

Abstract

The utility model discloses an asymmetric powder metallurgy mould for gear belongs to powder metallurgy technical field, and this mould includes die set and shaping frame, and die set includes the upper punch that sets gradually from the top down, well mould and lower punch, and the die set is equipped with the through hole, is equipped with the plug in the through hole, is equipped with the die cavity that is used for the gear shaping in the well mould, and the plug runs through down punch and die cavity, shaping frame include gland and pressure pad, and gland and pressure pad are connected with the lower punch, and the central axis of die cavity is different on same straight line with the central axis of die set. The utility model can ensure the uniform stress of the mould by coinciding the stress central line of the gear with the central axis of the mould, avoid the uneven damage of the stress of the mould and especially prolong the service life of the core rod; the core rod adopts a threaded connection mode, and the rod body has high strength.

Description

Asymmetric powder metallurgy mould for gear

Technical Field

The utility model belongs to the technical field of powder metallurgy, concretely relates to asymmetric powder metallurgy mould for gear.

Background

Powder metallurgy forming is one of the basic processes in powder metallurgy production, the aim being to produce a semifinished product with a predetermined geometry, size, density and strength from loose (metal, ceramic, or other material) powder by pressing in a mould, and then obtaining a semifinished blank by demoulding. The semi-finished product is at least required to be subjected to a subsequent sintering process to become a finished product. In the process of die pressing of some asymmetric gear products, because the parts of the die are long, the efficient continuous production cannot be realized due to uneven stress in the forming process, particularly the core rod in the middle of the die is easy to break, and the production efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

The technical problem is as follows: to the above-mentioned problem that exists among the prior art, the utility model aims to solve the technical problem that a long service life's asymmetric powder metallurgy mould for gear is provided.

The technical scheme is as follows: in order to solve the technical problem, the utility model discloses a technical scheme as follows:

the utility model provides an asymmetric powder metallurgy mould for gear, includes die set and shaping frame, die set includes the upper punch, well mould and the undershoot that set gradually from the top down, be equipped with the through hole in the die set, be equipped with the plug in the through hole, be equipped with the die cavity that is used for gear forming in the well mould, the plug runs through undershoot and die cavity, shaping frame includes gland and pressure pad, gland and pressure pad with the undershoot is connected, the central axis of die cavity with the central axis of die set is not on the same straight line.

Preferably, the stressed central line of the gear coincides with the central axis of the die set.

Preferably, the mandrel comprises a first rod body and a second rod body, and the first rod body and the second rod body are detachably connected through threads.

Preferably, the lower punch comprises a next punch, a lower second punch and a lower third punch which are arranged from top to bottom in sequence.

Preferably, the gland comprises a next stamping cover, a second lower stamping cover and a third lower stamping cover, and the pressing pads comprise a next stamping pad, a second lower stamping pad and a third lower stamping pad.

Preferably, the next stamping cover and the next stamping pad are connected with the next stamping, the lower second stamping cover and the lower second stamping pad are connected with the lower second stamping, and the lower third stamping cover and the lower third stamping pad are connected with the lower third stamping.

Preferably, the next punching pad, the second punching pad and the third punching pad are connected through connecting rods, and the number of the connecting rods is more than one.

Preferably, the tail end of the connecting rod is further connected with a bottom pad, and a plurality of threaded holes are formed in the bottom pad.

Has the advantages that: compared with the prior art, the utility model has the advantages of it is following: 1. the utility model can ensure the uniform stress of the mould by coinciding the stress central line of the gear with the central axis of the mould, avoid the uneven damage of the stress of the mould and especially prolong the service life of the core rod; 2. the core rod adopts a sectional threaded connection mode, and the rod body has high strength.

Drawings

Fig. 1 is a schematic structural view of a shift gear according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention;

FIG. 3 is a schematic cross-sectional view of the die set of the present invention;

fig. 4 is a schematic cross-sectional view of the upper punch of the present invention;

FIG. 5 is a schematic view of a force center of a shift gear according to an embodiment of the present invention;

FIG. 6 is a three-dimensional view of the shape structure of the forming frame of the present invention;

fig. 7 is a schematic view of the structure of the mandrel of the present invention.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples, which are carried out in the light of the technical solutions of the present invention, and it should be understood that these examples are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1, in the shift gear 9 manufactured by the powder metallurgy process, the shift gear 9 is substantially in a hollow cylindrical shape, one side of the shift gear is provided with teeth 91, the other side of the shift gear is provided with grooves 92 for shifting, the upper end of the shift gear is provided with a top wall 93, a circular through hole 94 is formed in the center of the top wall 93, two sides of the shift gear 9 are in an asymmetric structure, and in the process of using a mold to form, the two sides are stressed unevenly, so that a core rod of the mold is easily damaged.

As shown in fig. 2 and 3, an asymmetric powder metallurgy gear die for forming a gear shift 9 comprises a die set and a forming frame, wherein the die set comprises an upper punch 1, a middle punch 2 and a lower punch 3 which are sequentially arranged from top to bottom, the lower punch 3 comprises a next punch 31, a lower second punch 32 and a lower third punch 33 which are sequentially arranged from top to bottom, a through hole 11 is arranged in the die set, the through hole 11 sequentially penetrates through the upper punch 1, the middle punch 2 and the lower punch 3 from top to bottom, a core rod 4 is arranged in the through hole 11, a die cavity 5 for forming the gear is arranged in the middle punch 2, the metal powder is contained in the die cavity 5, the core rod 4 penetrates through the lower punch 3 and the die cavity 5, the upper punch 1 presses the metal powder in the die cavity 5 from the upper part, the next punch 31, the lower second punch 32 and the lower third punch 33 press the metal powder from the lower part, the outer ring of the lower third punch 33 is wrapped in the middle punch 2, and the lower second punch 32 is wrapped in the outer ring 33, the next punch 31 is wrapped around the outer ring of the next punch 32, so that the metal powder in the die cavity 5 is pressed into the shift gear 9 by the combined action of the core rod 4, the upper punch 1, the middle die 2 and the lower punch 3.

As shown in fig. 3, 4, and 5, in order to uniformly apply the force to the core rod 4, the central axis of the cavity 5 is not aligned with the central axis of the die set, and the force-applying center line of the asymmetric gear in the cavity 5 coincides with the central axis of the die set. The central axis of the die cavity 5 is the central axis of the shift gear 9, i.e. the line a in fig. 3, the central axis of the die set is the line B in fig. 3, and the stressed central line of the shift gear 9 is coincident with the line B; as shown in fig. 4, when the upper punch 1 is shown, the central axis of the die set, i.e., the central axis of the upper punch 1, is a line B, the central axis of the shift gear 9, i.e., the central axis of the through hole 11, is a line a, and the acting force center line of the upper punch 1 coincides with the line B; as shown in fig. 5, when the gear 9 is shifted, the force center of the gear 9 is not on the central axis thereof, and the force center of the gear is on the central axis of the die set, so as to prevent the mandrel 4 in the die set from being damaged due to uneven force, and prolong the service life of the mandrel.

As shown in fig. 2 and 6, the forming frame is used for connecting the die set and the machine table and driving the die set to move, the forming frame includes a press cover 6 and a press pad 7, the press cover 6 includes a next press cover 61, a lower second press cover 62 and a lower third press cover 63, the press pad 7 includes a next press pad 71, a lower second press pad 72 and a lower third press pad 73, the next press cover 61 and the next press pad 71 are respectively connected with the next punch 31 from above and below and clamp the next punch 31, so that the next punch 31 can be driven to move up and down, the upper end of the next punch 31 enters the middle die 2 to participate in the press forming operation, similarly, the lower second press cover 62 and the lower second press pad 72 are respectively connected with the lower second punch 32 from above and below, and the lower third press cover 63 and the lower third press pad 73 are respectively connected with the lower third punch 33 from above and below. The next punching pad 71, the lower second punching pad 72 and the lower third punching pad 73 are connected through four connecting rods 34, so that the next punching 31, the lower second punching 32 and the lower third punching 33 can move integrally, the tail end of each connecting rod 34 is also connected with a bottom pad 35, and a plurality of threaded holes 351 are formed in the bottom pad 35 and used for being connected with driving equipment of a machine table to drive the lower punching 3 to move integrally.

As shown in fig. 7, the mandrel 4 includes a first rod 41 and a second rod 42, the first rod 41 and the second rod 42 are detachably connected by a screw, the strength of the rods is improved by changing the conventional welding-type connection of the mandrel 4 into a screw connection, the material of the mandrel 4 can be changed, and the fracture resistance of the rods is improved by changing the original cemented carbide WC into a steel ASP60 with good toughness.

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 modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides an asymmetric powder metallurgy mould for gear, its characterized in that includes die set and shaping frame, die set includes from the top down upper punch (1) that sets gradually, well mould (2) and lower punch (3), the die set is equipped with through hole (11), be equipped with plug (4) in through hole (11), be equipped with die cavity (5) that are used for gear shaping in well mould (2), plug (4) run through down punch (3) and die cavity (5), the shaping frame includes gland (6) and pressure pad (7), gland (6) and pressure pad (7) with lower punch (3) are connected, the central axis of die cavity (5) with the central axis of die set is not on the same straight line.

2. The die for the asymmetric powder metallurgy gear according to claim 1, wherein a force-receiving center line of the gear coincides with a central axis of the die set.

3. The die for asymmetric powder metallurgy gears according to claim 1, wherein the mandrel (4) comprises a first rod body (41) and a second rod body (42), and the first rod body (41) and the second rod body (42) are detachably connected through a thread.

4. The die for asymmetric powder metallurgy gears according to claim 1, wherein the lower punch (3) comprises a next punch (31), a next second punch (32) and a next third punch (33) which are arranged in sequence from top to bottom.

5. The die for asymmetric powder metallurgy gears according to claim 4, wherein the gland (6) includes a next-to-press lid (61), a second-to-press lid (62), and a third-to-press lid (63), and the press pads (7) include a next-to-press pad (71), a second-to-press pad (72), and a third-to-press pad (73).

6. The die for asymmetric powder metallurgy gears according to claim 5, wherein the next punch cover (61) and the next punch pad (71) are connected to the next punch (31), the lower second punch cover (62) and the lower second punch pad (72) are connected to the lower second punch (32), and the lower third punch cover (63) and the lower third punch pad (73) are connected to the lower third punch (33).

7. The die for asymmetric powder metallurgy gears according to claim 5, wherein the next punching pad (71), the second punching pad (72), and the third punching pad (73) are connected by a connecting rod (34), and the number of the connecting rods (34) is one or more.

8. The die for the asymmetric powder metallurgy gear according to claim 7, wherein a bottom pad (35) is further connected to the tail end of the connecting rod (34), and a plurality of threaded holes (351) are formed in the bottom pad (35).