CN102989940A - Processing method of positioning hook forge piece - Google Patents

Abstract

The invention discloses a processing method of a positioning hook forge piece. The processing method of the positioning hook forge piece comprises the following steps: 1), selectively using 35mm round steel and cutting by using a shearing machine, wherein the length of a sheared rough blank piece is 172mm; 2) putting the rough blank piece obtained in the step 1 into an intermediate frequency heating furnace for heating at a heating temperature of 1120 to 1180 DEG C and keeping the heating for 2-3min; 3) drawing out two ends of the workpiece obtained in the step 2 by utilizing an air hammer till the arrival of 20+/-2mm diameter, wherein the hammer drawing is performed for 8-14 times; 4) putting the drawn-out workpiece into a bending die of a punching machine for bending; 5), putting the bent workpiece into a shaping die in an electric screw press for hot forging by using the shaping die, wherein the temperature is 900 DEG C and the pressure is 630T; and 6) putting the hot forged workpiece into the punching machine for side cutting and punching. With the adoption of a quenching and tempering heat treatment technology for a positioning hook provided by the invention, the high temperature normalizing and the forging are caused to organically form a continuous production line; and therefore, the defects of the prior art are overcome, the energy resource is saved, the heat treatment quality is improved, the production period is shortened, the production cost is lowered and the radiation pollution to a workshop environment is reduced.

Description

A kind of processing method of location hook forging

Technical field

The present invention relates to the manufacture field of location hook, specifically belong to a kind of processing method of location hook forging.

Background technology

The train location hook is an important accessory of railway freight-car, it mainly is the chief component of syndeton about tank body and the underframe end, simultaneously, prevent that tank body from producing transverse shifting in running, so railway freight-car has higher quality requirement with location hook itself.Existing railway freight-car is the method for casting with the manufacture method of location hook, and what the location hook casting was adopted is sand casting, i.e. water-glass sand carbon dioxide hardening technique.

There is following major defect in it:

Surface forming is bad, presentation quality is poor, the defective such as pore, shrinkage cavity and porosity is more, and the reason that causes these defectives is the structure of foundry goods itself, and is larger such as four boss position wall thickness, molten steel is not easy feeding, easily produce the defectives such as shrinkage cavity and porosity, so that moulding accessory interior tissue is comparatively loose, and internal flaw is difficult for finding, have a strong impact on the quality of moulding accessory, had potential harm; The pressing plate modeling process need to play the core could moulding in addition, and casting mold or fuse be in the situation that parch and easily produce gas hole defect, and in the modeling process, the clean casting flaws such as burning into sand, drop that easily produce of what cleaning affect the presentation quality of foundry goods.

Summary of the invention

The processing method that the purpose of this invention is to provide a kind of location hook forging, with high temperature normalizing and the quenching-and-tempering process that forges the location hook that organically forms tinuous production, overcome the defective of prior art, saved the energy, improved thermal treatment quality, shorten the production cycle, reduced production cost, reduced the radiation pollution to workshop condition.

Technical scheme of the present invention is as follows:

A kind of processing method of location hook forging is characterized in that may further comprise the steps:

A, cast cylinder blank step

Chemical component weight percentage is in the cylinder blank: C 0.18-0.40%, Mn 0.5-2.0%, Si 0.6-0.9%, V 0.09-0.15%, Ti 0.11-0.22%, Cr 0.4-0.8%, Ni 0.4-0.9%, Mo 0.15～0.30%, W 0.4-0.8%, Nb 0.02-0.08%, Al 0.15～0.20%, Mg 0.15～0.50%, P≤0.030%, S≤0.030%, and surplus is Fe and inevitably is mingled with matter;

B, forging step

1), to select diameter be 35 mm round steel shape blanks, utilizes cutter to carry out blanking, blank length is 172mm after shearing;

2), blank that step 1 is obtained puts into the intermediate-frequency heating furnace heating, heating-up temperature 1120-1180 ℃, keeps 20-35min heat time heating time;

3), with step 2) workpiece that obtains, utilize pneumatic hammer that the two ends of above-mentioned workpiece are pulled out, pull out to diameter 20 ± 2 mm and get final product, pulling out the hammer number of times is 8-14 time;

4), the enterprising line bend operation of bending die of putting into punch press of the workpiece after will pulling out;

5), the workpiece after the bending is put on the mould of electric screw press, utilize mould forge hot workpiece; 900 ℃ of temperature, pressure 630T;

6), with the workpiece after the forge hot, put into that punch press is cut edge, punching processes;

C, heat treatment step

1), will cut edge, the workpiece after the punching carries out normalized treatment, is heated to 880 ± 10 ℃ in heat-treatment furnace, and the air cooling of coming out of the stove after being incubated 3.5～4 hours;

2), with the workpiece Shot Blasting after the heat treatment, adopt apron type airless shot blasting machine that forging is carried out surface treatment, until oxide skin that its surface produces all comes off;

3), the workpiece behind the ball blast carried out cold school process, finally obtain finished product.

Step 2 in the described forging step) blank in is put into intermediate-frequency heating furnace heating, 1150 ℃ of heating-up temperatures, retention time 2.7min.

Compared with the prior art, beneficial effect of the present invention is as follows:

The present invention only needs a few fire to get final product, and blank is repeatedly overturn, pulls out, and the defective of steel part inside can be compacted, and the blank internal modification is even, is not prone to the dead band, makes location hook with this forging method, and the qualification rate of product is higher.

The present invention has overcome the defective of prior art with high temperature normalizing and the quenching-and-tempering process that forges the location hook that organically forms tinuous production, has saved the energy, improved thermal treatment quality, shorten the production cycle, reduced production cost, reduced the radiation pollution to workshop condition.

Of the present invention PowerPerformance detection data is as follows:

Tensile strength 〉=921 Mpa

Yield strength 〉=786 Mpa

Percentage elongation 〉=16%

The contraction percentage of area 〉=45%

Brinell hardness HB=217-244.

The specific embodiment

A kind of processing method of location hook forging may further comprise the steps:

A, cast cylinder blank step

Chemical component weight percentage is in the cylinder blank: C 0.18-0.40%, Mn 0.5-2.0%, Si 0.6-0.9%, V 0.09-0.15%, Ti 0.11-0.22%, Cr 0.4-0.8%, Ni 0.4-0.9%, Mo 0.15～0.30%, W 0.4-0.8%, Nb 0.02-0.08%, Al 0.15～0.20%, Mg 0.15～0.50%, P≤0.030%, S≤0.030%, and surplus is Fe and inevitably is mingled with matter;

B, forging step

1), to select diameter be 35 mm round steel shape blanks, utilizes cutter to carry out blanking, blank length is 172mm after shearing;

2), blank that step 1 is obtained puts into the intermediate-frequency heating furnace heating, heating-up temperature 1120-1180 ℃, keeps 20-35min heat time heating time;

3), with step 2) workpiece that obtains, utilize pneumatic hammer that the two ends of above-mentioned workpiece are pulled out, pull out to diameter 20 ± 2 mm and get final product, pulling out the hammer number of times is 8-14 time;

4), the enterprising line bend operation of bending die of putting into punch press of the workpiece after will pulling out;

5), the workpiece after the bending is put on the mould of electric screw press, utilize mould forge hot workpiece; 900 ℃ of temperature, pressure 630T;

6), with the workpiece after the forge hot, put into that punch press is cut edge, punching processes;

C, heat treatment step

1), will cut edge, the workpiece after the punching carries out normalized treatment, is heated to 880 ± 10 ℃ in heat-treatment furnace, and the air cooling of coming out of the stove after being incubated 3.5～4 hours;

2), with the workpiece Shot Blasting after the heat treatment, adopt apron type airless shot blasting machine that forging is carried out surface treatment, until oxide skin that its surface produces all comes off;

3), the workpiece behind the ball blast carried out cold school process, finally obtain finished product.

Step 2 in the described forging step) blank in is put into intermediate-frequency heating furnace heating, 1150 ℃ of heating-up temperatures, retention time 2.7min.

Claims (2)

1. the processing method of a location hook forging is characterized in that may further comprise the steps:

A, cast cylinder blank step

Chemical component weight percentage is in the cylinder blank: C 0.18-0.40%, Mn 0.5-2.0%, Si 0.6-0.9%, V 0.09-0.15%, Ti 0.11-0.22%, Cr 0.4-0.8%, Ni 0.4-0.9%, Mo 0.15～0.30%, W 0.4-0.8%, Nb 0.02-0.08%, Al 0.15～0.20%, Mg 0.15～0.50%, P≤0.030%, S≤0.030%, and surplus is Fe;

B, forging step

1), to select diameter be 35 mm round steel shape blanks, utilizes cutter to carry out blanking, blank length is 172mm after shearing;

2), blank that step 1 is obtained puts into the intermediate-frequency heating furnace heating, heating-up temperature 1120-1180 ℃, keeps 20-35min heat time heating time;

3), with step 2) workpiece that obtains, utilize pneumatic hammer that the two ends of above-mentioned workpiece are pulled out, pull out to diameter 20 ± 2 mm and get final product, pulling out the hammer number of times is 8-14 time;

4), the enterprising line bend operation of bending die of putting into punch press of the workpiece after will pulling out;

5), the workpiece after the bending is put on the mould of electric screw press, utilize mould forge hot workpiece; 900 ℃ of temperature, pressure 630T;

6), with the workpiece after the forge hot, put into that punch press is cut edge, punching processes;

C, heat treatment step

1), will cut edge, the workpiece after the punching carries out normalized treatment, is heated to 880 ± 10 ℃ in heat-treatment furnace, and the air cooling of coming out of the stove after being incubated 3.5～4 hours;

2), with the workpiece Shot Blasting after the heat treatment, adopt apron type airless shot blasting machine that forging is carried out surface treatment, until oxide skin that its surface produces all comes off;

3), the workpiece behind the ball blast carried out cold school process, finally obtain finished product.

2. the processing method of location hook forging according to claim 1 is characterized in that: the blank the step 2 in the described forging step) is put into intermediate-frequency heating furnace heating, 1150 ℃ of heating-up temperatures, retention time 2.7min.