CN215681209U

CN215681209U - Forming die for fan-shaped graphite carbon brush

Info

Publication number: CN215681209U
Application number: CN202022758109.5U
Authority: CN
Inventors: 陆超
Original assignee: TRIS (ZHENJIANG) CARBON CO Ltd
Current assignee: TRIS (ZHENJIANG) CARBON CO Ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2022-01-28
Anticipated expiration: 2030-11-25

Abstract

The utility model discloses a fan-shaped graphite carbon brush forming die which comprises a female die, an upper punch and a lower punch, wherein the female die is provided with a first punch hole; the center part of the female die is provided with a special-shaped die cavity which penetrates through the female die in the radial direction; the special-shaped die cavity is divided into a first die cavity, a second die cavity and a third die cavity from top to bottom; the first die cavity and the third die cavity are both of cuboid structures with rectangular longitudinal sections; the longitudinal section of the third die cavity is of a right-angled trapezoid structure; the right trapezoid takes the joint of adjacent die cavities as an upper base and a lower base, the bevel edge of the right trapezoid is an arc-shaped edge, and the radian of the arc-shaped edge is matched with that of the molded fan-shaped graphite carbon brush. The die disclosed by the utility model not only forms the arc surface of the fan-shaped graphite carbon brush at one time, obviously reduces subsequent processing procedures, but also avoids the difficulty caused by the special processing of the arc surface, and the prepared die also has the advantages of good size consistency and high precision, improves the working efficiency and reduces the processing cost.

Description

Forming die for fan-shaped graphite carbon brush

Technical Field

The utility model relates to the field of powder metallurgy dies, in particular to a fan-shaped graphite carbon brush forming die.

Background

At present, common carbon brush products on the market show larger physical property difference in different pressing directions of materials due to fixed pressing directions, the phenomenon is called anisotropy of the carbon brush, and the bending strength and the resistivity of the materials in different directions can reach 2 to 3 times of difference, so that the use performance of the carbon brush is greatly influenced.

When the carbon brush finished product required by the customer has a cylindrical structure with a cross section similar to a sector shape, specifically as shown in fig. 1, the pressing direction is from the directions of the inclined surfaces at the two sides, specifically as shown in fig. 2 (the shaded area is the part to be processed). Because the existence of face of cylinder and both sides inclined plane, the shaping and the processing mode and the process step of this carbon brush are shown in fig. 3 under general condition, and the blank after the shaping need process at least 4 and just can obtain required shape, and the shadow region is the position that needs processing, and this scheme not only the manufacturing procedure is more, and face of cylinder processing is difficult, and the processing cost is high, is unfavorable for mass production, and the material is extravagant many moreover, is unfavorable for environmental protection and energy-conservation.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to solve the problems in the prior art, the utility model provides a forming die for a fan-shaped graphite carbon brush, which solves the problems of multiple processing procedures of a formed blank, high processing cost and large material waste in the prior art.

The technical scheme is as follows: in order to achieve the purpose, the utility model can adopt the following technical scheme: a fan-shaped graphite carbon brush forming die comprises a female die, an upper punch and a lower punch; the center part of the female die is provided with a special-shaped die cavity which axially penetrates through the female die; the special-shaped die cavity is divided into three sections from top to bottom, namely a first die cavity, a second die cavity and a third die cavity in sequence;

the first die cavity and the third die cavity are both of cuboid structures with rectangular longitudinal sections; the side length of the joint of the first die cavity and the second die cavity is larger than that of the joint of the second die cavity and the third die cavity; the longitudinal section of the second die cavity is of a right-angled trapezoid structure; the right trapezoid takes the joint of adjacent die cavities as an upper base and a lower base, the bevel edge of the right trapezoid is an arc-shaped edge, and the radian of the arc-shaped edge is matched with that of the molded fan-shaped graphite carbon brush.

Further, the female die is of a cylindrical structure.

Furthermore, 2 special-shaped mold cavities are arranged in the center of the female mold in parallel; the die sinking of a plurality of products can be realized, and the work efficiency is improved.

Furthermore, a first connecting part protruding towards the periphery is arranged at the top end of the upper punch; the first connecting portion fixes the upper punch to the upper die frame connecting mechanism above.

Furthermore, a second connecting part protruding towards the periphery is arranged at the bottom end of the lower punch; the second connecting part fixes the lower punch to a lower die frame connecting mechanism below.

Furthermore, before the die stamping, the bottom end of the upper die stamping is positioned above the first die cavity and is arranged at an upper stop point outside the first die cavity; the top end of the lower punch is positioned at the lower dead center of the middle part in the third die cavity; filling graphite powder to the upper surface of the special-shaped die cavity from the top end of the lower punch; the upper punch and the lower punch move simultaneously to perform biaxial die pressing, and the upper punch moves to the joint of the first die cavity and the second die cavity and stops; the lower punch moves to the joint of the second die cavity and the third die cavity and stops; after pressing the blank with the same shape as the second die cavity, the upper punch returns to the top dead center of the upper punch, and the lower punch continues to move upwards to push the pressed blank out of the special-shaped die cavity.

Furthermore, a circle of concave parts are arranged on the periphery of the upper part of the upper punch; a circle of concave part is arranged on the periphery of the lower part of the lower punch; the method is used for reducing the frictional resistance between the upper punch and the lower punch and the female die during the forming of the carbon brush, and is convenient for gas discharge in the pressing process.

Has the advantages that: the utility model has the following advantages: the die has the advantages that the arc surface is formed at one time, the subsequent processing procedures are obviously reduced, the difficulty caused by the special processing of the arc surface is avoided, the size consistency of the prepared die is good, the precision is high, the working efficiency is improved, and the processing cost is reduced.

Drawings

FIG. 1 is a schematic perspective view of a finished fan-shaped graphite carbon brush;

FIG. 2 is a schematic view of a pressing direction of a fan-shaped graphite carbon brush in the prior art;

FIG. 3 is a schematic view of a prior art process for preparing a fan-shaped graphite carbon brush from a blank;

fig. 4 is a schematic perspective view of a fan-shaped graphite carbon brush forming mold according to embodiment 1 of the present invention;

fig. 5 is a schematic view of a connection structure of a fan-shaped graphite carbon brush forming mold and a mold control mechanism according to embodiment 1 of the present invention;

fig. 6 is a schematic longitudinal sectional view of a fan-shaped graphite carbon brush forming die according to embodiment 1 of the present invention before die stamping;

fig. 7 is a schematic longitudinal sectional view of a fan-shaped graphite carbon brush forming die according to embodiment 1 of the present invention during die stamping;

fig. 8 is a schematic longitudinal sectional view of a fan-shaped graphite carbon brush forming die according to embodiment 1 of the present invention after the die is removed by punching;

fig. 9 is a schematic flow chart of a process for manufacturing a fan-shaped graphite carbon brush from a blank after a mold is demolded according to embodiment 1 of the utility model.

Detailed Description

Example 1:

referring to fig. 4-9, the utility model discloses a forming die for a fan-shaped graphite carbon brush, which comprises a female die 1, an upper punch 2 and a lower punch 3; the center of the female die 1 is provided with a special-shaped die cavity 4 which axially penetrates through the female die; the special-shaped die cavity 4 is divided into three sections from top to bottom, namely a first die cavity 41, a second die cavity 42 and a third die cavity 43 in sequence;

the female die 1 is of a cylindrical structure; the number of the special-shaped die cavities 4 is 2, and the special-shaped die cavities are arranged in the center of the female die 1 in parallel; the die sinking of a plurality of products can be realized, and the work efficiency is improved.

The first mold cavity 41 and the third mold cavity 43 are both rectangular structures with rectangular longitudinal sections; the side length of the joint of the first die cavity 41 and the second die cavity 42 is larger than that of the joint of the second die cavity 42 and the third die cavity 43; the longitudinal section of the second die cavity 42 is of a right-angled trapezoid structure; the right trapezoid takes the joint of the adjacent die cavities as an upper base and a lower base, the bevel edge of the right trapezoid is an arc-shaped edge, and the radian of the arc-shaped edge is matched with that of the arc-shaped edge of the molded fan-shaped graphite carbon brush.

The top end of the upper punch 2 is provided with a first connecting part 21 protruding towards the outer periphery; the first connecting point 21 secures the upper punch 2 to the upper frame connecting means 22.

The bottom end of the lower punch 3 is provided with a second connecting part 31 protruding towards the periphery; the second connecting point 31 secures the lower punch 3 to the lower die carrier connecting mechanism 32 below.

A circle of concave parts are arranged on the periphery of the upper part of the upper punch 2; a circle of concave parts are arranged on the periphery of the lower part of the lower punch 3; the method is used for reducing the frictional resistance between the upper punch and the lower punch and the female die during the forming of the carbon brush, and is convenient for gas discharge in the pressing process.

The working process is as follows:

before the die stamping, the bottom end of the upper punch 2 is positioned above the first die cavity 41 and is arranged at an upper stop point outside the first die cavity; the top end of the lower punch 3 is located at the bottom dead center in the middle of the third die cavity 43; please refer to fig. 6 specifically; graphite powder is filled to the upper surface of the special-shaped die cavity 4 from the top end of the lower punch 3;

the upper and lower die control mechanisms respectively control the upper punch 2 and the lower punch 3 to move simultaneously to perform biaxial die pressing, and the upper punch 2 moves to the joint of the first die cavity 41 and the second die cavity 42 and stops; the lower punch 3 moves to the joint of the second die cavity 42 and the third die cavity 43 and stops; please refer to the state shown in fig. 7;

after pressing the blank 5 with the same shape as the second die cavity 42, the upper punch 2 returns to the top dead center thereof, and the lower punch 3 continues to move upwards to push the pressed blank 5 out of the special-shaped die cavity 4; please refer to the state shown in fig. 8.

After the blank is pressed, as shown in fig. 9, the machining process 1 is performed, and the corresponding fan-shaped graphite carbon brush forming die can be obtained through two machining processes of the machining process 2, compared with the machining process (4 processes) shown in fig. 3 in the prior art, the circular arc surface is formed at one time, the subsequent machining processes are obviously reduced, the difficulty caused by the fact that the circular arc surface needs to be machined specially is avoided, and the prepared die has the advantages of good size consistency and high precision, the working efficiency is improved, and the machining cost is reduced.

Claims

1. A fan-shaped graphite carbon brush forming die is characterized by comprising a female die (1), an upper punch (2) and a lower punch (3); the center of the female die (1) is provided with an axially-penetrated special-shaped die cavity (4); the special-shaped die cavity (4) is divided into three sections from top to bottom, namely a first die cavity (41), a second die cavity (42) and a third die cavity (43) in sequence;

the first die cavity (41) and the third die cavity (43) are both of rectangular structures with rectangular longitudinal sections; the side length of the joint of the first die cavity (41) and the second die cavity (42) is larger than that of the joint of the second die cavity (42) and the third die cavity (43); the longitudinal section of the second die cavity (42) is of a right-angled trapezoid structure; the right trapezoid takes the joint of adjacent die cavities as an upper base and a lower base, the bevel edge of the right trapezoid is an arc-shaped edge, and the radian of the arc-shaped edge is matched with that of the molded fan-shaped graphite carbon brush.

2. The forming die for the fan-shaped graphite carbon brush according to claim 1, characterized in that: the female die (1) is of a cylindrical structure.

3. The forming die for the fan-shaped graphite carbon brush according to claim 1, characterized in that: the number of the special-shaped die cavities (4) is 2, and the special-shaped die cavities are arranged in the center of the female die (1) in parallel.

4. The forming die for the fan-shaped graphite carbon brush according to claim 1, characterized in that: the top end of the upper punch (2) is provided with a first connecting part (21) protruding towards the periphery; the first connecting portion (21) fixes the upper punch (2) to an upper die holder connecting mechanism (22).

5. The forming die for the fan-shaped graphite carbon brush according to claim 1, characterized in that: the bottom end of the lower punch (3) is provided with a second connecting part (31) protruding towards the periphery; the second connecting part (31) fixes the lower punch (3) to a lower die carrier connecting mechanism (32) below.

6. The forming die for the fan-shaped graphite carbon brush according to claim 1, characterized in that: a circle of concave parts are arranged on the periphery of the upper part of the upper punch (2); the periphery of the lower part of the lower punch (3) is provided with a circle of concave parts.