CN217775471U

CN217775471U - For military use bearing blank forges mould subassembly

Info

Publication number: CN217775471U
Application number: CN202222191405.0U
Authority: CN
Inventors: 佟娜; 王龙; 郭文杰
Original assignee: Harbin Bearing Group Ltd
Current assignee: Harbin Bearing Group Ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2022-11-11
Anticipated expiration: 2032-08-19

Abstract

A military bearing blank forging die assembly relates to the technical field of machining and forging. The forging method aims to solve the problems that in the existing forging process of military bearing blanks, in three processes of material section cake upsetting, punching and bottom cutting, because the outer diameter of the blanks is not restrained and positioned by a die, the blanks are freely formed, the inner diameter is the proper inner diameter of the blanks which are forged by a punching punch held by a worker through experience alignment, the whole process of blank forming is manually operated by the worker, the inner diameter is easy to deflect, so that the design requirements cannot be met, and the service life of the bearing is further influenced. And (3) performing forming forging on the blank, firstly inserting the top end of the lower punch into the through hole in the middle of the lower surface of the forming die, then placing the blank subjected to cake upsetting on the top end of the lower punch through the through hole in the upper surface of the forming die, finally inserting the bottom of the upper punch into the through hole in the upper surface of the forming die, performing multiple times of extrusion, and performing plug-in cooperation of the forming die, the upper punch and the lower punch to forge and form the blank subjected to cake upsetting. The utility model is suitable for a forge the field.

Description

For military use bearing blank forges mould subassembly

Technical Field

The utility model relates to a machining forges technical field, concretely relates to for military use bearing blank forges mould assembly.

Background

The military product bearing blank forging equipment 1T hammer adopts a free forging mode, and the free forging process of the bearing blank is as follows: the method comprises three processes of material section heating → upsetting cake → punching → bottom cutting → rolling, material section upsetting cake, punching and bottom cutting, wherein the outer diameter has no die constraint and positioning, the free forming is realized, the inner diameter is the inner diameter of a blank which is properly formed by a worker holding a punching punch through experience alignment forging, the whole process of blank forming is manually operated by the worker, the inner diameter is easy to deviate, the blank forming is not standard, the difficulty is brought to the subsequent rolling process, the operator is required to have extremely high technical level and matching capability, the military supplies are made of special steel with high hardness, high viscosity and high forming and rolling difficulty, so that only some bearing forged pieces with large rolling expansion ratio and low width can be processed, products with high width, small rolling expansion ratio of the outer diameter and the inner diameter cannot be processed, and the processing range of a 1T hammer is greatly limited. In addition, the outer diameter of the forging blank is not restricted in the free forming process, and the metal streamline structure in the forged forging is not good, so that the service life of the bearing is influenced.

In summary, in the existing forging process of a military bearing blank, in three processes of material section cake upsetting, punching and bottom cutting, because the outer diameter of the blank is not restrained and positioned by a die, the blank is freely formed, the inner diameter is the proper inner diameter of the blank which is formed by aligning and forging a punching punch held by a worker through experience, the whole process of blank forming is manually operated by the worker, the inner diameter is easily deviated by punching, and in addition, the outer diameter of the blank of the forged piece is not restrained in the free forming process, the structure of a metal streamline in the forged piece is not good, so that the design requirement cannot be met, and the service life of the bearing is further influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve present forging in-process to for military use bearing blank, at the material section upset cake, punch a hole and cut the end in the three process, because the blank external diameter does not have mould restraint and location, free forming, the internal diameter is that the handheld punching punch of workman relies on experience alignment to forge suitable blank internal diameter, the blank shaping overall process all leans on workman manually operation, the internal diameter is very easy towards partially, including the forging blank in free forming process, the external diameter is not retrained, the inside metal streamline tissue of forging back forging is not good, thereby can't reach the designing requirement, and then influence bearing life's problem, and provide a for military use bearing blank and forge mould subassembly.

The utility model discloses a military bearing blank forging die assembly, which comprises a forming die, an upper stamping die, a lower stamping die, a perforating die and a hole cutting die;

the forming die, the upper punching die and the lower punching die are in insertion fit; or the forming die perforation die and the hole cutting die are in inserted fit;

furthermore, a circular through hole is processed in the middle of the upper surface of the forming die, and chamfers are processed at the edges of the upper part and the lower part of the circular through hole;

further, an arc-shaped groove is machined in the middle of the outer surface of the forming die along the circumferential direction;

further, an arc-shaped bulge is processed in the middle of the lower surface of the upper punching die;

further, an arc-shaped bulge is processed in the middle of the upper surface of the lower punch die;

furthermore, a counter bore is formed in the middle of the upper surface of the hole cutting die, a tapered hole is formed in the middle of the lower surface of the hole cutting die, and the tapered hole is communicated with the counter bore;

further, the section diameter of the perforating die is smaller than that of the upper punch die;

furthermore, when the forging die is used, firstly, the blank is formed and forged, the top end of the lower stamping die is inserted into the through hole in the middle of the lower surface of the forming die, then the blank after upsetting cake is placed at the top end of the lower stamping die through the through hole in the upper surface of the forming die, finally, the bottom of the upper stamping die is inserted into the through hole in the upper surface of the forming die and is extruded for multiple times, the blank after upsetting cake is formed by utilizing the insertion fit of the forming die, the upper stamping die and the lower stamping die, the blank is placed into the forming die, the outer diameter of the blank is restrained and positioned by the die, so that the outer diameters of the blank are unified, the size precision of the formed by forging is improved, the arc-shaped bulge processed in the middle of the lower surface of the upper stamping die is matched with the arc-shaped bulge processed in the middle of the upper surface of the lower stamping die, the position of the inner hole of the blank is more positive, the processing difficulty of the rolling expansion process is greatly reduced, and the quality of the forged piece after rolling expansion is improved;

and then, cutting the bottom of the blank after forging forming, replacing a lower punching die in a forming die with a hole cutting die, replacing an upper punching die in the forming die with a hole punching die, utilizing the middle part of the upper surface of the hole cutting die to be provided with a counter bore, utilizing the hole punching die to downwards extrude the middle part of the blank, and dividing the blank into two parts from the center, thereby finishing the forging treatment of the blank.

Compared with the prior art, the utility model following beneficial effect has:

the utility model overcomes prior art's shortcoming, carry out the shaping forging to the blank when using, insert the through-hole at moulded die lower surface middle part with the top of punch down earlier inside, the blank after the cake will be upset again places the top at punch down through-hole on the moulded die, the bottom that will go up the punch up at last inserts inside the through-hole of moulded die upper surface, and carry out the extrusion many times, utilize the moulded die, go up the die and punch down the cooperation of pegging graft, make the blank after the cake forge the shaping, the inside of putting the moulded die into with the blank utilization, make the stock external diameter have mould restraint and location, thereby make the external diameter of stock unify, and then the fashioned size precision of forging has been improved, the lower surface middle part processing of utilizing the punch up has the protruding cooperation of arc with the upper surface middle part processing of punch down, the position of the hole of making the blank is more positive, greatly reduced the processing degree of difficulty of process, the forging quality after having improved the roll-expansion, design requirements has been satisfied, the bearing that the stock processing that utilizes the device to produce, and service life is longer.

Drawings

FIG. 1 is a main half-sectional view of a military bearing blank forging die assembly of the present invention in a use state at a forging stage;

FIG. 2 is a main half-sectional view of a military bearing blank forging die assembly according to the present invention in a use state of cutting the blank after forging and forming;

FIG. 3 is a front sectional view of a forming die in a military bearing blank forging die assembly in accordance with the present invention;

FIG. 4 is a front cross-sectional view of an upper punch die of a military bearing blank forging die assembly in accordance with the present invention;

FIG. 5 is a front cross-sectional view of a lower punch die of a military bearing blank forging die assembly in accordance with the present invention;

FIG. 6 is a front cross-sectional view of a piercing die in a military bearing blank forging die assembly in accordance with the present invention;

fig. 7 is a main sectional view of a hole cutting die in a military bearing blank forging die assembly according to the present invention.

Detailed Description

The first specific implementation way is as follows: the military bearing blank forging die assembly of the embodiment is described with reference to fig. 1 to 7, and comprises a forming die 1, an upper die 2, a lower die 3, a punching die 5 and a hole cutting die 6;

the forming die 1, the upper punching die 2 and the lower punching die 3 are in inserted fit; or the perforation die 5 and the hole cutting die 6 of the forming die 1 are matched in an inserting way;

when the forging die is used, firstly, the blank is formed and forged, the top end of a lower punch die 3 is inserted into a through hole in the middle of the lower surface of a forming die 1, the blank subjected to cake upsetting is placed at the top end of the lower punch die 3 through the through hole in the upper surface of the forming die 1, finally, the bottom of an upper punch die 2 is inserted into the through hole in the upper surface of the forming die 1, multiple times of extrusion are performed, the blank subjected to cake upsetting is formed by inserting and matching the forming die 1, the upper punch die 2 and the lower punch die 3, the blank subjected to cake upsetting is placed into the forming die 1, the outer diameter of the blank has die restraint and positioning, the outer diameters of the blank are unified, the size precision of the formed by forging is improved, an arc-shaped bulge is processed in the middle of the lower surface of the upper punch die 2 and an arc-shaped bulge is processed in the middle of the upper surface of a rolling die 3, the position of an inner hole of the blank is correct, the processing difficulty of a rolling process is greatly reduced, and the quality of a forged piece after expansion is improved;

and then cutting the bottom of the blank after forging forming, replacing the lower punching die 3 in the forming die 1 with a hole cutting die 6, replacing the upper punching die 2 in the forming die 1 with a hole perforating die 5, utilizing the middle part of the upper surface of the hole cutting die 6 to be provided with a counter bore, utilizing the hole perforating die 5 to extrude the middle part of the blank downwards, and then dividing the blank into two parts from the center, thereby finishing the forging treatment of the blank.

The second embodiment is as follows: the present embodiment is described with reference to fig. 3, and is further limited to the forging die set according to the first embodiment, in which a circular through hole is formed in the middle of the upper surface of the forming die 1, and chamfers are formed at the upper and lower edges of the circular through hole.

The third concrete implementation mode: the present embodiment is described with reference to fig. 3, and the present embodiment further defines the forging mold assembly according to the second embodiment, in the forging mold assembly for military bearing blank according to the present embodiment, an arc-shaped groove is formed in the middle of the outer surface of the forming die 1 along the circumferential direction;

in the specific embodiment, the arc-shaped groove is machined in the middle of the outer surface of the forming die 1 along the circumferential direction, so that the clamping is facilitated.

The fourth concrete implementation mode: the present embodiment is described with reference to fig. 4, and is further limited to the forging die set according to the first embodiment, in which an arc-shaped protrusion is formed in the middle of the lower surface of the upper die 2.

The fifth concrete implementation mode: the present embodiment is described with reference to fig. 5, and the present embodiment further defines the forging die set according to the first embodiment, in the forging die set for military bearing blank according to the present embodiment, an arc-shaped protrusion is formed in the middle of the upper surface of the lower die 3;

according to the specific embodiment, the arc-shaped bulge is machined in the middle of the lower surface of the upper punch 2 and matched with the arc-shaped bulge machined in the middle of the upper surface of the lower punch 3, so that the position of the inner hole of the blank is correct, the machining difficulty of the rolling process is greatly reduced, and the quality of the rolled forge piece is improved.

The sixth specific implementation mode: the embodiment is described with reference to fig. 7, and the embodiment further defines the forging mold assembly according to the first embodiment, in the forging mold assembly for military bearing blanks according to the embodiment, a counter bore is formed in the middle of the upper surface of the hole cutting die 6, a tapered hole is formed in the middle of the lower surface of the hole cutting die 6, and the tapered hole is communicated with the counter bore.

The seventh embodiment: the present embodiment is described with reference to fig. 4 and 6, and is further limited to the forging die set according to the first embodiment, and the sectional diameter of the bottom of the punching die 5 is smaller than the sectional diameter of the bottom of the upper punch 2.

Principle of operation

When the forging die is used, firstly, a blank is formed and forged, the top end of the lower punch die 3 is inserted into the through hole in the middle of the lower surface of the forming die 1, then the blank 4 subjected to cake upsetting is placed at the top end of the lower punch die 3 through the through hole in the upper surface of the forming die 1, finally, the bottom of the upper punch die 2 is inserted into the through hole in the upper surface of the forming die 1, multiple times of extrusion are carried out, the blank 4 subjected to cake upsetting is formed by inserting and matching the forming die 1, the blank 4 is placed into the forming die 1, the outer diameter of the blank 4 is restricted and positioned by the die, the outer diameter of the blank 4 is unified, the size precision of the forging forming is improved, the processing range of the 1T hammer is widened, and forgings can be processed for products which cannot be produced before. The product types widened are:

1. the width of the bearing is less than 18mm, the inner diameter of the bearing is less than 55mm, and the wall thickness of the bearing is greater than 25 mm;

2. the width of the bearing forging exceeds 70mm, the inner diameter of the bearing forging is less than 55, the outer diameter of the bearing forging is less than 110mm, the rolling expansion ratio of the two types of special steel bearing forgings is not enough, rolling expansion cannot be achieved, the forging sizes required by the process can be directly forged and formed on a 1T hammer by using the set of forming die, and rolling expansion is not needed;

3. the special steel bearing forging with the width larger than 50mm and the outer diameter smaller than 150mm can be rolled and expanded after a blank is formed by a forming die. The problems and difficulties are thoroughly solved, some uncontrollable factors of manual operation are compensated, the processing range of free forging of the 1T hammer military products and the quality of the forged products are greatly improved, and the metal streamline structure in the forged products and the service life of military product bearings are prolonged; the processing ranges before and after the improvement of the special steel are shown in the following table:

then, the arc-shaped bulge processed in the middle of the lower surface of the upper punch die 2 is matched with the arc-shaped bulge processed in the middle of the upper surface of the lower punch die 3, so that the position of an inner hole of a blank is correct, the processing difficulty of a rolling process is greatly reduced, and the quality of a forged piece after rolling is improved;

and then, cutting the bottom of the forged blank 4, replacing the lower punching die 3 in the forming die 1 with a hole cutting die 6, replacing the upper punching die 2 in the forming die 1 with a hole penetrating die 5, utilizing the middle part of the upper surface of the hole cutting die 6 to be provided with a counter bore, utilizing the hole penetrating die 5 to extrude the middle part of the blank 4 downwards, and dividing the blank 4 into two parts from the center, thereby finishing the forging treatment of the blank.

Claims

1. The utility model provides a for military use bearing blank forges mould subassembly which characterized in that: the punching die comprises a forming die (1), an upper punching die (2), a lower punching die (3), a punching die (5) and a hole cutting die (6);

the forming die (1), the upper punching die (2) and the lower punching die (3) are in inserted fit; or the perforation die (5) of the forming die (1) is in plug-in fit with the hole cutting die (6).

2. The military bearing blank forging die assembly of claim 1, wherein: the upper surface middle part of moulded die (1) process and have circular through-hole, and the upper portion of this circular through-hole all processes with lower part edge has the chamfer.

3. The military bearing blank forging die assembly of claim 2, wherein: an arc-shaped groove is processed in the middle of the outer surface of the forming die (1) along the circumferential direction.

4. The military bearing blank forging die assembly of claim 1, wherein: the middle part of the lower surface of the upper punching die (2) is provided with an arc-shaped bulge.

5. The military bearing blank forging die assembly of claim 1, wherein: an arc-shaped bulge is processed in the middle of the upper surface of the lower punching die (3).

6. The military bearing blank forging die assembly of claim 1, wherein: the middle part of the upper surface of the hole cutting die (6) is provided with a counter bore, the middle part of the lower surface of the hole cutting die (6) is provided with a tapered hole, and the tapered hole is communicated with the counter bore.

7. The military bearing blank forging die assembly of claim 1, wherein: the diameter of the section of the bottom of the punching die (5) is smaller than that of the section of the bottom of the upper punch die (2).