阅读说明：本技术 一种粉末冶金齿毂成形模具 (Powder metallurgy gear hub forming die ) 是由 张艳伟 钱夏晨 石小荣 夏敏 刘桦 于 2021-10-08 设计创作，主要内容包括：本发明提供一种粉末冶金齿毂成形模具,包括上冲模和下冲模,所述上冲模和下冲模均包括外冲和中冲,所述外冲套设于所述中冲外侧,所述外冲内壁面后侧设有多个沿周向设置的定位环,所述中冲外壁面上沿周向间隔设有多个与所述定位环配合的定位键。本发明提供的一种粉末冶金齿毂成形模具,提高了模具生产过程中的稳定性,降低卡模风险,提高模具寿命；提高零件生产过程质量稳定性；提高零件外齿端面跳动精度,取消外齿端面机加工。(The invention provides a powder metallurgy gear hub forming die which comprises an upper punching die and a lower punching die, wherein the upper punching die and the lower punching die respectively comprise an outer punch and a middle punch, the outer punch is sleeved outside the middle punch, a plurality of positioning rings arranged along the circumferential direction are arranged on the rear side of the inner wall surface of the outer punch, and a plurality of positioning keys matched with the positioning rings are arranged on the outer wall surface of the middle punch at intervals along the circumferential direction. According to the powder metallurgy gear hub forming die, the stability in the die production process is improved, the die clamping risk is reduced, and the service life of the die is prolonged; the quality stability of the part production process is improved; the run-out precision of the outer tooth end face of the part is improved, and the machining of the outer tooth end face is cancelled.)

1. The utility model provides a powder metallurgy tooth hub forming die, includes punch die and lower punch die, go up the punch die and all include outer punching (1) and well punching (2) down the punch die, outer punching (1) cover is located well punching (2) outside, its characterized in that: the rear side of the inner wall surface of the outer punch (1) is provided with a plurality of positioning rings (101) arranged along the circumferential direction, and the outer wall surface of the middle punch (2) is provided with a plurality of positioning keys (201) matched with the positioning rings (101) at intervals along the circumferential direction.

2. A powder metallurgy hub forming die as claimed in claim 1, wherein: the positioning key (201) is arranged along the length direction of the middle punch (2).

3. A powder metallurgy hub forming die as claimed in claim 1, wherein: outer towards (1) internal face from preceding to back and be equipped with the cooperation section in proper order and avoid the sky section, it is a plurality of on the section of keeping away is all located to holding ring (101), cooperation section and well towards (2) cooperation clearance between the outer wall be not more than 0.03mm, keep away the sky section and well towards (2) cooperation clearance between the outer wall be 0.3mm ~ 0.4mm, cooperation clearance between holding ring (101) and navigation key (201) is not more than 0.03 mm.

4. A powder metallurgy hub forming die as claimed in claim 3, wherein: the front section of the outer punch (1) is provided with a tooth-shaped part (102), and the length of the tooth-shaped part (102) is the same as that of the matching section.

Technical Field

The invention relates to the technical field of powder metallurgy, in particular to a powder metallurgy gear hub forming die.

Background

The production process of the prior powder metallurgy gear hub mainly comprises the following steps: shaping, sinter hardening, shaping, machining, and the like. Because the particularity of tooth hub part structure, the part mostly has the breach of more than 3 equipartitions, leads to hub part forming die's outer towards usually with tooth hub complex burst formula profile of tooth structure, burst formula profile of tooth structure still with well towards complex location section, the during operation for avoiding mould card powder, at outer towards the internal wall and well towards the outer wall setting and keep away the vacancy section, keep away the vacancy section and locate the location section rear side.

In the forming process, the split type tooth-shaped structure of the outer punch is deformed under stress, so that the positioning effective section of the original outer punch design is deformed, the fit clearance between the outer punch and the middle punch is not uniform, and the end face jump of the outer tooth is unstable in the production process of parts.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to overcome the defects that the forming process is unstable due to the fact that the fit clearance between an outer punch and a middle punch is unstable due to stress of a die in the forming process in the prior art, the invention provides a powder metallurgy gear hub forming die.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a powder metallurgy tooth hub forming die, includes punch die and lower punch die, go up the punch die and punch die down and all include outer dashing and dashing in the well, outer dashing the cover and locating in dashing in the outside, outer dashing the internal face rear side and being equipped with a plurality of holding rings that set up along circumference, in dash on the outer wall along circumference interval be equipped with a plurality ofly with holding ring complex navigation key.

The outer punch is sleeved outside the middle punch, and the positioning ring is added on the outer punch, so that the precision of the matching surface can be effectively improved; positioning keys are additionally arranged on the middle punch, and a certain interval is required between the positioning keys, so that residual powder can pass through the middle punch in the production process, and the mold clamping condition is avoided; outer dashing and well dashing and pass through the positioning key and the cooperation of holding ring, form new location section, can effectual improvement outer dashes and well dashes the cooperation stability between, and it is even to guarantee to dash the fit clearance between and well dashing outward, improves part production process stability, solves the unstable problem of external tooth facing runout.

Further, the positioning key is arranged along the length direction of the middle punch.

Further, outer towards the internal face from the front to back and be equipped with the cooperation section in proper order and keep away the sky section, it is a plurality of on the space-keeping section is all located to the holding ring, cooperation section and well cooperation clearance between towards the outer wall are not more than 0.03mm, keep away the cooperation clearance between the section and the well outer wall of dashing and be 0.3mm ~ 0.4mm, cooperation clearance between holding ring and the navigation key is not more than 0.03 mm. The arrangement of the avoidance section is used for avoiding blocking powder and avoiding the blocking condition.

Furthermore, the outer punching front section is provided with a tooth-shaped part, and the length of the tooth-shaped part is the same as the length of the matching section.

The invention has the beneficial effects that: the invention provides a powder metallurgy gear hub forming die which has the following advantages: 1. the stability in the production process of the die is improved, the die clamping risk is reduced, and the service life of the die is prolonged; 2. the quality stability of the part production process is improved; 3. the run-out precision of the outer tooth end face of the part is improved, and the machining of the outer tooth end face is cancelled.

Drawings

The invention is further illustrated by the following figures and examples.

FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure of the outer punch;

FIG. 3 is a schematic diagram of a center punch;

in the figure: 1. the external punch 101, the positioning ring 102, the tooth-shaped part 2, the middle punch 201 and the positioning key.

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.

As shown in fig. 1-3, the powder metallurgy gear hub forming die comprises an upper die and a lower die, wherein the upper die and the lower die both comprise an outer punch 1 and a middle punch 2, the outer punch 1 is sleeved outside the middle punch 2, a plurality of positioning rings 101 arranged along the circumferential direction are arranged on the rear side of the inner wall surface of the outer punch 1, a plurality of positioning keys 201 matched with the positioning rings 101 are arranged on the outer wall surface of the middle punch 2 along the circumferential direction at intervals, and the positioning keys 201 are arranged along the length direction of the middle punch 2.

Outer 1 anterior segment of dashing is equipped with profile of tooth portion 102, outer 1 internal face of dashing is equipped with the cooperation section in proper order after to from the front and keeps away the sky section, profile of tooth portion 102 length is the same with the cooperation section length, and is a plurality of holding ring 101 all locates on keeping away the sky section, cooperation section and well dash 2 outer wall between the cooperation clearance be 0.03mm, keep away the sky section and well dash 2 outer wall between the cooperation clearance be 0.3mm, the cooperation clearance between holding ring 101 and the navigation key 201 is 0.03 mm.

The working principle is as follows:

compared with the method for machining the whole inner wall surface of the outer punch 1, the positioning rings 101 are machined on the inner wall surface of the outer punch 1, so that machining accuracy is more accurate; towards 2 outsides in locating towards 1 cover outward, the cooperation of holding ring 101 and navigation key 201 makes the cooperation between 1 outer towards and 2 well towards more stable, and the card powder is avoided in the space between the navigation key 201, can avoid appearing the card mould condition.

Directions and references (e.g., up, down, left, right, etc.) may be used in the present disclosure only to aid in the description of features in the figures. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.

In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.