CN210877547U

CN210877547U - Forming die for internal gear powder metallurgy

Info

Publication number: CN210877547U
Application number: CN201921826424.8U
Authority: CN
Inventors: 宁上中
Original assignee: Zhangjiagang Zhenjiang Powder Metallurgy Product Co ltd
Current assignee: Zhangjiagang Zhenjiang Powder Metallurgy Product Co ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-06-30
Anticipated expiration: 2029-10-28

Abstract

The utility model discloses a forming die for internal gear powder metallurgy with delicate forming and good use performance of finished products, which comprises a middle die holder and an upper punch used for forming the upper surface of a workpiece, the lower punch is arranged on the upper section of the middle die core in a circumferential and uniform distribution mode, the middle section of the middle die core is a round smooth inner wall, the upper punch is movably provided with an upper punch, the lower part of the upper punch is provided with a circle of forming grooves for forming teeth inside the workpiece, the upper hole wall of the lower punch axial through hole is provided with a plurality of guide forming blocks matched with the forming grooves, the top of each guide forming block is an inclined plane for forming the end parts of the teeth of the workpiece, the inner wall of the lower section of the middle die core is circumferentially provided with a plurality of positioning grooves, and the outer side of the upper part of the lower punch is provided with a plurality of positioning lugs clamped into the positioning grooves; a plurality of preset blocks clamped into gaps between the guide forming blocks on the inner wall of the lower punch are arranged on the outer side of the upper section of the core rod in the circumferential direction.

Description

Forming die for internal gear powder metallurgy

Technical Field

The utility model relates to an internal gear forming die for powder metallurgy.

Background

In the internal gear shown in fig. 1 and 2, when the powder metallurgy processing is adopted, the traditional method of powder blank is to punch and form by adopting the structure of an upper punch, a middle die, a lower punch and a core rod. After the workpiece powder blank is sintered, a circle of groove on the periphery needs to be machined.

However, with the structure, the arc angle of the inner teeth of the workpiece can not be made, the inner gear ring is used for engaging gears, and if the inner teeth do not have round corners, the gear disengaging condition can occur in actual use, so that the use performance is seriously influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the forming die for the powder metallurgy of the internal gear is fine in forming and good in service performance of a finished product.

For solving the technical problem, the utility model discloses the technical scheme who adopts does: the forming die for powder metallurgy of the internal gear comprises a middle die holder, an upper punch, a lower punch and a core rod, wherein the upper punch and the lower punch are used for forming the upper surface of a workpiece, the core rod is arranged in an axial through hole in the middle of the lower punch in a penetrating manner, a middle die core for forming the outer side surface of the workpiece is detachably arranged in the middle die holder, a plurality of outer forming notches of peripheral spacing blocks of the formed workpiece are uniformly distributed on the upper section in the middle die core in the circumferential direction, the middle section in the middle die core is a round smooth inner wall, and the,

an upper punch is movably arranged in the upper punch in a penetrating manner, a circle of forming groove used for forming teeth inside the workpiece is arranged at the lower part of the upper punch, a plurality of guide forming blocks matched with the forming groove are arranged on the upper hole wall of the lower punch axial through hole, the top of each guide forming block is an inclined surface for forming the end part inclined surface of the tooth of the workpiece, and the lower part of the upper punch is inserted into the lower punch axial through hole to be matched with the middle die core and the lower surface of the upper punch to form a forming cavity of the formed workpiece; a plurality of vertical positioning grooves for guiding and positioning the lower punch and the upper punch are circumferentially arranged on the inner wall of the lower section of the middle mold core, and a plurality of positioning lugs clamped into the positioning grooves are arranged on the outer side of the upper part of the lower punch; a plurality of preset blocks clamped into gaps between the guide forming blocks on the inner wall of the lower punch are arranged on the outer side of the upper section of the core rod in the circumferential direction.

The utility model has the advantages that:

because the middle die core is used for forming the outer side surface of a workpiece, a plurality of outer forming notches of the forming workpiece periphery spacing blocks are uniformly distributed on the upper section of the middle die core in the circumferential direction, the middle section of the middle die core is a round smooth inner wall, the core rod is matched with the lower punch and the middle die core to form a feeding cavity for feeding, the upper punch is movably penetrated and provided with the upper punch, the lower part of the upper punch is provided with a forming groove for forming teeth inside the workpiece, the round angle of the inner teeth of the workpiece can be accurately formed, and therefore the product is good in use performance. The upper hole wall of the lower punch axial through hole is provided with a plurality of guide forming blocks matched with the forming grooves, the top of each guide forming block is an inclined surface for forming the end part inclined surface of the tooth of the workpiece, and the core rod moves downwards while the lower parts of the upper punches are inserted into the lower punch axial through hole to be matched with the middle mold core and the lower surface of the upper punch to form a forming cavity of the formed workpiece; because the outer side of the upper section of the mandrel is circumferentially provided with a plurality of preset forming blocks clamped into gaps between the guide forming blocks on the inner wall of the lower punch, the mandrel can preset the inner hole of the workpiece, iron powder can be prevented from scattering, and the forming precision of the workpiece is ensured.

A plurality of vertical positioning grooves used for guiding and positioning the lower punch moving up position are circumferentially arranged on the inner wall of the lower section of the middle mold core, and a plurality of positioning lugs clamped into the positioning grooves are arranged on the outer side of the upper part of the lower punch, so that the lower punch can move more stably, and can conveniently, quickly and accurately move in place in the vertical direction.

Drawings

Fig. 1 is a schematic view of the structure of the processed product of the present invention.

Fig. 2 is a schematic sectional structure view of the processed product of the present invention.

Fig. 3 is a schematic view of the structure of the present invention.

Fig. 4 is a schematic top view of the undershoot in the present invention.

Fig. 5 is a schematic view of the inner section of the upper section of the middle mold core in the present invention.

In fig. 3 to 5: 1. the forming die comprises a middle die holder, 2. an upper punch, 3. a lower punch, 31. a guide forming block and 32. a positioning lug; 4. core rod, 5, middle mold core, 6, two punching.

Detailed Description

The following describes in detail a specific embodiment of the present invention with reference to the drawings.

As shown in fig. 3-5, the forming die for powder metallurgy of internal gear comprises a middle die holder 1, an upper punch 2 used for forming the upper surface of a workpiece, a lower punch 3, and a core rod 4 inserted into an axial through hole in the middle of the lower punch 3, wherein a middle die core 5 used for forming the outer side surface of the workpiece is detachably arranged in the middle die holder 1, a plurality of outer forming notches of peripheral spacing blocks of the formed workpiece are circumferentially and uniformly distributed on the upper section in the middle die core 5, the middle section in the middle die core 5 is a circular smooth inner wall, and the core rod 4, the lower punch 3 and the middle die core 5 are matched to form a feeding cavity for feeding;

an upper punch 6 is movably arranged in the upper punch 2 in a penetrating mode, a circle of forming groove used for forming teeth inside a workpiece is formed in the lower portion of the upper punch 6, a plurality of guide forming blocks 31 matched with the forming groove are arranged on the upper hole wall of an axial through hole of the lower punch 3, the top of each guide forming block 31 is an inclined surface used for forming the end portion of each tooth of the workpiece, and the lower portion of the upper punch 6 is inserted into the axial through hole of the lower punch 3 to be matched with the middle die core 5 and the lower surface of the upper punch 2 to form a forming cavity of the formed workpiece when the core rod 4 moves downwards; a plurality of vertical positioning grooves for guiding and positioning the upward movement position of the lower punch 3 are circumferentially arranged on the inner wall of the lower section of the middle mold core 5, and a plurality of positioning lugs 32 clamped into the positioning grooves are arranged on the outer side of the upper part of the lower punch 3; a plurality of preset blocks clamped into the gaps between the guide forming blocks 31 on the inner wall of the lower punch 3 are arranged on the outer side of the upper section of the core rod 4 in the circumferential direction.

After the workpiece powder blank is sintered, a circle of groove on the periphery still needs to be machined.

The above-mentioned embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be used, and are not intended to limit the present invention; it should be noted that, for those skilled in the art, without departing from the inventive concept, several variations and modifications can be made, which are within the scope of the present invention.

Claims

1. Internal gear is forming die for powder metallurgy, its characterized in that: the feeding device comprises a middle die holder, an upper punch, a lower punch and a core rod, wherein the upper punch, the lower punch and the core rod are used for forming the upper surface of a workpiece, the core rod is arranged in an axial through hole in the middle of the lower punch in a penetrating manner, a middle die core used for forming the outer side surface of the workpiece is detachably arranged in the middle die holder, a plurality of outer forming notches of peripheral spacing blocks of the formed workpiece are uniformly distributed on the upper section of the middle die core in the circumferential direction, the middle section of the middle die core is a round smooth;