CN111299494A

CN111299494A - Manufacturing method of bearing ring forging

Info

Publication number: CN111299494A
Application number: CN202010191704.7A
Authority: CN
Inventors: 郝明闪; 朱淑圭; 郑峰; 周黎明
Original assignee: Hangzhou Steam Turbine Casting and Forging Co Ltd
Current assignee: Hangzhou Steam Turbine Casting and Forging Co Ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2020-06-19
Anticipated expiration: 2040-03-18
Also published as: CN111299494B

Abstract

The application discloses a bearing ring forging manufacturing method, which comprises the following steps of: flattening the decagonal or octahedral columnar steel blank into a rectangular column; upsetting: pressing the rectangular column into an oval sphere; a drawing step: drawing the elliptical ball into a rectangular prism, wherein the included angle between the drawing surface and the pressing surface in the flattening step is 90 degrees. The manufacturing method has the following beneficial effects: the steel ingot is compacted and compacted by the raw materials through three steps of flattening, upsetting and drawing, and the compacting effect which can be achieved only by five steps of the traditional method can be achieved through the three steps, so that the forging and pressing fire frequency can be reduced, the production efficiency is improved, and the production cost is reduced.

Description

Manufacturing method of bearing ring forging

Technical Field

The invention relates to the field of metal forging, in particular to a method for manufacturing a bearing ring forging.

Background

The bearing ring is a very important device on a fan, and the current method for manufacturing the bearing ring is shown in figure 1, a hexahedral billet is taken as a raw material to be forged, a total of 7 small figures are shown in figure 1, and seven processing procedures are represented from left to right and from top to bottom respectively.

Referring to fig. 1, a forging process of a bearing ring is described in detail, first, a steel billet in a hexahedral (or octahedral) shape is used as a raw material, and is subjected to a stretching treatment by pressing a clamping handle to form an octahedral shape (a first small diagram in fig. 1), then, a upsetting treatment is performed (the treated shape is shown as a second small diagram in fig. 1, and the structure is still substantially an octahedral column), then, a stretching treatment is performed (the treated shape is shown as a third small diagram in fig. 1), a upsetting treatment is performed after the treatment is completed (the treated shape is shown as a fourth small diagram in fig. 1), then, a stretching treatment is performed (the treated shape is shown as a fifth small diagram in fig. 1, and the structure is substantially a cylindrical shape), blanking, upsetting and punching treatments are performed after the above steps are completed (the treated structure is shown as a sixth small diagram in fig. 1), and finally, a hole expanding and finishing treatment are performed (the treated structure is shown as a seventh small diagram in fig. 1). The forging process is complicated and inconvenient.

Disclosure of Invention

The invention provides a bearing ring forging manufacturing method aiming at the problems.

The technical scheme adopted by the invention is as follows:

a bearing ring forging manufacturing method comprises the following steps,

s1 (flattening step): flattening the decagonal or octahedral columnar steel blank into a rectangular column;

s2 (upsetting step): pressing the cuboid column into an elliptical ball;

s3 (elongation step): and drawing the elliptical ball into a rectangular prism, wherein the included angle between the drawing surface and the pressing surface in the flattening step is 90 degrees.

Because the included angle between the drawing surface in the drawing step and the extrusion surface in the flattening step is 90 degrees, the rectangular column can be extruded in all four directions, namely the front direction, the rear direction, the left direction and the right direction, and the steel ingot can be compacted in all directions. According to the method, the steel ingot is compacted and compacted through three steps of flattening, upsetting and drawing out of the raw materials, and the compacting effect which can be achieved through five steps of the traditional method can be achieved through the three steps, so that the forging and pressing fire frequency can be reduced, the production efficiency is improved, and the production cost is reduced.

Optionally, the ratio of the width to the height of the rectangular parallelepiped pillar in the flattening step is 1: 3.

when the billet is flattened, the original octahedral column or sixteen-surface column billet is flattened into a cuboid column, so that when the length of the final column is fixed, the deformation in the height direction of the pressed cuboid column is improved by more than 20% compared with the original octahedral column, and the steel ingot core compacting effect in the direction is ensured.

Optionally, the ratio of the width to the height of the rectangular parallelepiped pillar in the drawing step is 1: 3.

the ratio of the width to the height of the cuboid column in the drawing step is 1: 3, when the length of the final column is fixed, the deformation amount of the drawn rectangular column in the height direction is improved by more than 20 percent compared with the original drawn octahedral column, and the compaction effect of the steel ingot core part in the direction is ensured.

Optionally, the drawing method further comprises the steps of blanking, upsetting and punching, after the drawing step is completed, the rectangular column is cut into a plurality of independent square blocks, the square blocks are further upset into round cakes, then punching is carried out, and the round cakes are punched into rings.

Optionally, the method further comprises a hole expanding treatment and a finishing treatment.

Because the ring after punching still has the aperture and does not reach the problem such as surface unevenness not up to standard, so need carry out reaming processing for the aperture of ring reaches standard requirement, and finishing treatment's effect is in order to let the disc surface level and smooth.

Optionally, the punching is a single-sided extrusion punching.

The single-side extrusion punching can avoid the surface folding defect of the inner hole caused by double-side punching, and creates good conditions for the next ring rolling. The finishing process has the step of ring rolling.

Optionally, the temperature of the steel billet in the flattening step, the upsetting step and the drawing step is maintained to be 850-1250 ℃.

The invention has the beneficial effects that: according to the method, the steel ingot is compacted and compacted through three steps of flattening, upsetting and drawing out of the raw materials, and the compacting effect which can be achieved through five steps of the traditional method can be achieved through the three steps, so that the forging and pressing fire frequency can be reduced, the production efficiency is improved, and the production cost is reduced.

Description of the drawings:

FIG. 1 is a schematic flow chart of a conventional bearing ring manufacturing process,

FIG. 2 is a schematic flow chart of a bearing ring forging manufacturing method.

The specific implementation mode is as follows:

the present invention will be described in detail below with reference to the accompanying drawings.

It should be noted that, in fig. 2, the sequence of the small drawings is first from top to bottom and then from bottom to top in order.

S1 (flattening step): flattening a hexahedral or octahedral steel blank into a rectangular column, wherein the width-to-height ratio of the rectangular column is 1: 3; the shape of the billet after the flattening step is shown in the first panel of fig. 2;

s2 (upsetting step): pressing the rectangular column into an oval sphere; the shape of the billet after the upsetting step is shown in the second smaller drawing in fig. 2;

s3 (elongation step): draw out into the cuboid post with oval spherical shape, and draw out the contained angle of long face and the extrusion face of flattening in the step when drawing out long be 90 degrees, and the width and the height ratio of cuboid post are 1: 3; the shape of the billet after drawing is shown in the third small drawing in figure 2;

s4 (blanking, upsetting, punching): cutting off redundant waste materials at two ends of a rectangular solid column, then cutting the rectangular solid column into a plurality of independent square blocks, further upsetting the square blocks into round cakes, then placing the round cakes on a disc with holes, and punching the round cakes into a circular ring by a single-side extrusion mode, wherein the structure of the circular ring is shown as a fourth small figure in the attached figure 2;

s5 (broaching, finishing): the holes of the circular ring are expanded, and then the surface of the circular ring is flattened, so that the circular ring becomes a regular circular ring.

The temperature of the billet is maintained between 850 ℃ and 1250 ℃ in the steps S1-S5.

In the step S1, the original octahedral column or sixteen-sided column shaped billet is flattened into the rectangular column during flattening, so that when the length of the final column is fixed, the deformation amount in the height direction of the pressed rectangular column is improved by more than 20% compared with the original pressed octahedral column shape, and the steel ingot core compacting effect in the direction is ensured.

In step S3, since the ratio of the width to the height of the rectangular parallelepiped pillar is 1: 3, when the length of the final column is fixed, the deformation amount of the drawn rectangular column in the height direction is improved by more than 20 percent compared with the original drawn octahedral column, and the compaction effect of the steel ingot core part in the direction is ensured.

In the above embodiment, since the included angle between the drawing surface in the drawing step and the extrusion surface in the flattening step is 90 degrees, the rectangular column can be extruded in all four directions, namely, the front, the back, the left and the right, so that the steel ingot can be compacted in all directions. According to the method, the steel ingot is compacted and compacted through three steps of flattening, upsetting and drawing out of the raw materials, and the compacting effect which can be achieved through five steps of the traditional method can be achieved through the three steps, so that the forging and pressing fire frequency can be reduced, the production efficiency is improved, and the production cost is reduced. Meanwhile, the product quality and the product percent of pass can be greatly improved.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields and are included in the scope of the present invention.

Claims

1. A bearing ring forging manufacturing method is characterized by comprising the following steps,

flattening: flattening the decagonal or octahedral columnar steel blank into a rectangular column;

upsetting: pressing the cuboid column into an elliptical ball;

a drawing step: and drawing the elliptical ball into a rectangular prism, wherein the included angle between the drawing surface and the pressing surface in the flattening step is 90 degrees.

2. The method of manufacturing a bearing ring forging of claim 1, wherein the step of flattening has a rectangular parallelepiped pillar width to height ratio of 1: 3.

3. the method of manufacturing a bearing ring forging of claim 2, wherein the ratio of the width to the height of the rectangular parallelepiped pillar in the step of elongating is 1: 3.

4. the method for manufacturing a bearing ring forging according to claim 1, further comprising blanking, upsetting and punching, wherein after the drawing step is completed, the rectangular column is cut into a plurality of independent blocks, the blocks are further upset into round cakes, and then punching is performed, and the round cakes are punched into rings.

5. The method of manufacturing a bearing ring forging of claim 4, further comprising a broaching process and a finishing process.

6. The method of manufacturing a bearing ring forging of claim 4, wherein said punch is a single side extrusion punch.

7. The method of manufacturing a bearing ring forging of claim 1, wherein the temperature of the billet during the flattening, upsetting and drawing steps is maintained between 850 ℃ and 1250 ℃.