CN103736838A - Machining method for backstop blank - Google Patents

Abstract

The invention relates to a machining method for a backstop blank, which belongs to the field of machining for railway wagon accessories. The machining method disclosed by the invention comprises the following steps of: heating the blank at first, and then performing axial and radial flattening, then punching the flattened blank, then performing rolling forming on the backstop blank by using a backstop rolling forming die, and finally shaping the backstop blank by a backstop shaping die. The machining amount of the blank machined by the method disclosed by the invention is reduced during subsequent machining; meanwhile, raw materials are saved, cost is decreased, machining equipment wear is reduced, and machining working hours are saved.

Description

Backstop blank processing method

Technical field

The present invention relates to a kind of backstop blank processing method, belong to railway freight-car accessory manufacture field.

Background technology

Critical effect has been played in backstop in the sealing of bearing, and it and the common fastening bearing inner race of protecgulum make bearing in motion process, and under the effect of axial force, do not produce and jump, thereby, guarantee railway freight-car safe operation.In traditional handicraft, the processing of bearing backstop adopts forging and stamping, mechanical processing technique to complete.Be specially backstop and first through forging and stamping, form blank, then through machine add, the manufacture such as phosphatization completes.Wherein in forging and stamping, form the process of blank, directly bar is forged into cake type, form like this that at follow-up machine, to add difficulty after blank larger, also more time-consuming, when blanking, also relatively waste raw material.

Summary of the invention

The object of the invention is, in order to make the blank after processing meet product design, in blanking process, to save raw material, at follow-up machine, add process and reduce labour intensity, save man-hour, thereby reach, reduce costs.

The object of the invention is to be achieved through the following technical solutions:

A kind of backstop blank processing method of the present invention, concrete steps are:

1) with bar, feed intake, the weight that feeds intake is 1.2～1.4 times of finished product.

2) bar of throwing in is heated to after 1100～1300 ℃, keep 10～15min, again blank is clapped flat: clap and be flatly divided into axially and radially clap flat, axially clap flat technique and make the aspect ratio required product height of blank material more than 10mm, radially clap the diameter that flat technique makes blank material and conform to backstop blank diameter.

3) blank of clapping after flat is carried out to punching, punching position and aperture will guarantee to match with product design.

4) adopt backstop to be rolled into pattern rear shelves blank is carried out to roller-compaction; Described backstop is rolled into pattern: the circulus that interior shape and backstop blank shape match;

Concrete roller-compaction technique is:

First backstop is rolled into pattern and is preheating to 150 ℃, then be fixed on fixture, by the 3rd) blank of step hole punch puts into backstop and is rolled into pattern, and the hole surrounding with staving press along blank rolls, and rolls to blank and fills up the inner chamber that backstop is rolled into pattern.

5) adopt backstop sizing die to carry out shaping process to rear shelves blank; Described backstop sizing die, comprises patrix die shank, patrix, counterdie, fixture.Patrix die shank is column structure, and the lower working face of patrix and the upper surface profile of backstop blank match, the loop configuration matching for inner chamber and blank outer wall profile of counterdie; Patrix is connected with forcing press by patrix die shank, and counterdie supports by fixture.

Concrete shaping process is: first by the preheating of backstop sizing die, preheat temperature is 150 ℃; By through the 4th) blank temperature after step roller-compaction is heated to be not less than 850 ℃, blank put between the upper die and lower die of backstop sizing die, by forcing press, patrix exerted pressure downwards, will obtain needed backstop blank after completing.

Beneficial effect is:

Adopt the blank of the inventive method processing, make the follow-up machine added-time reduce machine dosage, save raw material simultaneously, reduce costs, reduce machining equipment wearing and tearing, while saving machined.

Accompanying drawing explanation

Fig. 1 is backstop blank drawing.

Fig. 2 is that backstop is rolled into pattern figure.

Fig. 3 is backstop sizing die figure.

Wherein, 1-patrix die shank; 2-patrix; 3-counterdie; 4-fixture.

The specific embodiment

Below in conjunction with drawings and Examples, content of the present invention is further described.

Embodiment

The present invention relates to a kind of backstop blank processing method, concrete steps are:

1) with bar, feed intake, the size that feeds intake, for Φ 120 * 85 (mm), is removed surperficial burr.

2) with IGCT water-cooled static frequency changer, the bar of throwing in is heated, with the Portable infrared temperature measurement instrument of model PT300, every 30min, measure a furnace temperature, guarantee that blank does not have overheated burn-off phenomenon in heating process.Temperature more than 1100 ℃ can start forging blank, blank is clapped flat: clap and be flatly divided into axially and radially clap flatly, axially clap flat h=36, radially clap flat=Φ 185.

3) blank of clapping after flat is carried out its punching with 750kg pneumatic hammer machine, the technical program punching size is Φ 50.

4) first backstop is as shown in Figure 2 rolled into pattern and is preheating to 150 ℃, then be fixed on fixture, the blank of hole punch is put into backstop and be rolled into pattern, hole surrounding with 250mm staving press along blank rolls, blank can be filled the gap that backstop is rolled into pattern in the process rolling, after filling completely, can produce projection, namely modification along the route of staving press.

5) utilize the remaining temperature of blank to carry out shaping to it.Now blank temperature requires to be not less than 850 ℃, blank is put between the patrix 2 and counterdie 3 of backstop sizing die as shown in Figure 3 to 150 ℃ of the prior preheatings of backstop sizing die.With 100t forcing press, patrix 2 is exerted pressure downwards, after completing, will obtain needed backstop blank.

Claims (1)

1. a backstop blank processing method, is characterized in that: concrete steps are:

1) with bar, feed intake, the weight that feeds intake is 1.2～1.4 times of finished product;

2) bar of throwing in is heated to after 1100～1300 ℃, keep 10～15min, again blank is clapped flat: clap and be flatly divided into axially and radially clap flat, axially clap flat technique and make the aspect ratio required product height of blank material more than 10mm, radially clap the diameter that flat technique makes blank material and conform to backstop blank diameter;

3) blank of clapping after flat is carried out to punching, punching position and aperture will guarantee to match with product design;

4) adopt backstop to be rolled into pattern rear shelves blank is carried out to roller-compaction; Described backstop is rolled into pattern: the circulus that interior shape and backstop blank shape match;

Concrete roller-compaction technique is:

First backstop is rolled into pattern and is preheating to 150 ℃, then be fixed on fixture, by the 3rd) blank of step hole punch puts into backstop and is rolled into pattern, and the hole surrounding with staving press along blank rolls, and rolls to blank and fills up the inner chamber that backstop is rolled into pattern;

5) adopt backstop sizing die to carry out shaping process to rear shelves blank; Described backstop sizing die, comprises patrix die shank, patrix, counterdie, fixture; Patrix die shank is column structure, and the lower working face of patrix and the upper surface profile of backstop blank match, the loop configuration matching for inner chamber and blank outer wall profile of counterdie; Patrix is connected with forcing press by patrix die shank, and counterdie supports by fixture;

Concrete shaping process is: first by the preheating of backstop sizing die, preheat temperature is 150 ℃; By through the 4th) blank temperature after step roller-compaction is heated to be not less than 850 ℃, blank put between the upper die and lower die of backstop sizing die, by forcing press, patrix exerted pressure downwards, will obtain needed backstop blank after completing.

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