阅读说明：本技术 双耳绞生产加工模具及其锻造方法 (Double-lug-twisted production processing die and forging method thereof ) 是由 陈占民 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种双耳绞生产加工模具,所述模具包括制坯模、预锻模以及终锻模,所述的预锻模与所述的终锻模共同布置于一套组合模具上,该组合模具包括下锻模以及上锻模；所述下锻模的右侧设有预锻下模膛以及终锻下模膛,所述的预锻下模膛的前部设有分料凸起,所述的预锻下模膛的后部设有定位槽；所述定位槽的外部设有阻力沟；所述上锻模上设有与所述预锻下模膛、终锻下模膛相匹配的预锻上模膛以及终锻上模膛。本发明还公开了上述双耳绞的锻造方法,通过上述方法以及模具,大大提高了双耳绞的生产效率,节省了材料,提高了双耳绞的生产质量。(The invention discloses a double-lug-hinge production processing die which comprises a blank making die, a preforging die and a finish forging die, wherein the preforging die and the finish forging die are arranged on a set of combined die together, and the combined die comprises a lower forging die and an upper forging die; a pre-forging lower impression and a finish-forging lower impression are arranged on the right side of the lower forging die, a material distributing bulge is arranged at the front part of the pre-forging lower impression, and a positioning groove is arranged at the rear part of the pre-forging lower impression; a resistance groove is arranged outside the positioning groove; and the upper forging die is provided with a pre-forging upper die cavity and a finish-forging upper die cavity which are matched with the pre-forging lower die cavity and the finish-forging lower die cavity. The invention also discloses a forging method of the double-lug hank, and by the method and the die, the production efficiency of the double-lug hank is greatly improved, the material is saved, and the production quality of the double-lug hank is improved.)

1. A double-lug-hinge production processing die comprises a blank making die, a pre-forging die and a finish forging die, wherein the pre-forging die and the finish forging die are arranged on a set of combined die together, and the combined die comprises a lower forging die (3) and an upper forging die (4);

the method is characterized in that:

the blank making die comprises a lower blanking die (1) and an upper blanking die (2), wherein the lower blanking die (1) is provided with a first cavity (101) with an upward opening, the upper blanking die (2) is provided with a second cavity (201) for accommodating a bar, and the opening of the second cavity (201) is downward;

a pre-forging lower die cavity (301) and a finish-forging lower die cavity (305) are arranged on the right side of the lower forging die (3), a material distributing bulge (302) is arranged at the front part of the pre-forging lower die cavity (301), and a positioning groove (303) is arranged at the rear part of the pre-forging lower die cavity (301); a resistance groove (304) is arranged outside the positioning groove (303);

and the upper forging die (4) is provided with a preforging upper die cavity (401) and a finish forging upper die cavity (402) which are matched with the preforging lower die cavity (301) and the finish forging lower die cavity (305).

2. The double-lug-stranding production processing die according to claim 1, characterized in that: the top in first cavity (101) is equipped with a location portion (102), the interior bottom of second cavity (201) is equipped with a wedge-shaped material platform of cleaving (202).

3. The double-lug-stranding production processing die according to claim 1, characterized in that: the pre-forging lower die cavity (301) is U-shaped.

4. The double-lug-stranding production processing die according to claim 1, characterized in that: the finish forging lower die cavity (305) is arranged on one side of the pre-forging lower die cavity (301), and a cavity of the finish forging lower die cavity (305) is matched with the shape of the double-lug hinge.

5. A double-lug-stranding production tooling die according to any one of claims 1 to 4, characterised in that: an assembly groove (203) is formed in the surface of the upper material upsetting die (2), a telescopic component (204) is arranged in the assembly groove (203), and an assembly pin (103) is fixed at the bottom of the lower material upsetting die (1) and right above the assembly groove (203).

6. The double-lug-stranding production processing die according to claim 5, characterized in that: in the process of upsetting, the lower upsetting die (1) moves up and down to be assembled with the upper upsetting die (2), upsetting operation is carried out on the bar, and an assembling pin (103) is inserted into the assembling groove (203).

7. The double-lug-stranding production processing die according to claim 6, characterized in that: the preforging lower die cavity (301) and the preforging upper die cavity (401) are 2-5mm higher than the final forging lower die cavity (305) and the final forging upper die cavity (402), the preforging lower die cavity (301) and the preforging upper die cavity (401) are 1-2mm smaller than the widths of the final forging lower die cavity (305) and the final forging upper die cavity (402), and the inclination angles of the preforging lower die cavity (301), the preforging upper die cavity (401), the final forging lower die cavity (305) and the final forging upper die cavity (402) are the same.

8. A forging method of a double-lug-stranding production processing die according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:

step one, placing qualified raw materials on a band sawing machine according to drawing requirements, adjusting and positioning, and starting the band sawing machine to cut to obtain bars with required sizes;

step two, loading the qualified bars into a shot blasting machine, starting the shot blasting machine after confirming that all process parameters are correct, and taking out the bars for inspection after shot blasting is finished;

step three, coating lime slurry on one end face of the bar stock, and then placing the bar stock into an intermediate frequency furnace for heating, wherein the heating temperature is 1150-1230 ℃, the heating time is 200-220 seconds, the current is 190-210A, and the voltage is 500-520V;

vertically placing the bar stock with qualified temperature into a blank making mold, starting a pressure machine to make a blank, taking the blank after the blank is made out of the blank making mold, and removing oxide skin of the blank by using compressed air;

placing the blank on a pre-forging die, starting an electro-hydraulic hammer to strike the blank into a pre-forging piece, striking the pre-forging piece by 9 hammers, wherein the striking energy of each hammer is carried out according to the design requirement, and the compressed air is used for blowing off the die cavity and the oxide skin of the workpiece in the process of striking gaps by each hammer;

taking out the pre-forging piece from the pre-forging die and blowing the pre-forging piece completely, putting the pre-forging piece into a finish forging die for finish forging, wherein the finish forging strikes for 3 hammers, the striking energy of each hammer is carried out according to the design requirement, a die cavity and workpiece oxide skin are blown off by compressed air in the process of striking a gap by each hammer, and the finish forging piece is taken out after the shape and the surface oxide skin of the forging piece are qualified;

step seven, placing the finish forging on a trimming die, enabling the outline to be attached to the die cavity, then trimming, and taking out after checking no defect;

and step eight, loading the forged piece after the flash is cut into a shot blasting machine, starting the shot blasting machine after confirming that all process parameters are correct, taking out the forged piece after the shot blasting is finished, and carrying out appearance inspection.

9. The forging method of a binaural hank as set forth in claim 8, wherein: in the second step, a 600kg shot blasting machine is adopted, the charging is not more than 10kg each time, the current of the shot blasting machine is 20A-28A, the shot blasting time is 3 min-5 min, and after shot blasting, the appearance is checked to see whether the surface has the defects of cracks, oxide skin, residual oil stains, serious damage and missed blasting.

10. The forging method of a binaural hank as set forth in claim 8, wherein: in the fifth step and the sixth step, a 125KJ electro-hydraulic hammer is adopted, and the die is placed into a heating furnace for preheating before forging, wherein the preheating temperature is 350 ℃, and the preheating time is more than 3 hours; slowly baking the side surface of the die by using large-area flame before forging, and keeping the preheating temperature of the die; the graphite emulsion release agent is prepared according to the ratio of 25:1, and is added into a storage tank after being uniformly stirred.

Technical Field

The invention belongs to the technical field of production and processing of double-lug strands, and particularly relates to a double-lug strand production and processing die and a forging method thereof.

Background

The double-lug hinge is a part used for fixing or bearing devices, and is particularly widely applied to excavators. At present, more double-lug hinges are manufactured by heating and bending plates, the plates are made of more materials, the operation is complex, the temperature of a workpiece is not uniform, the temperature is easily reduced too fast, multiple times of remelting and heating are needed, the production period is long, the labor intensity of operators is high, and potential safety hazards exist.

Disclosure of Invention

The invention provides a double-lug stranding die, which aims at solving the problem of huge workload in the production and processing process of the existing double-lug stranding, and comprises a blank making die, a preforging die and a finish forging die, wherein the production and processing of the double-lug stranding are completed by a preselected bar through blank making, preforging and finish forging procedures, so that the material usage is saved, the production and processing workload of the double-lug stranding is reduced, the production efficiency of the double-lug stranding is improved, and the problems provided in the background technology are effectively solved.

In order to solve the above problems, the present invention adopts the following technical solutions.

A double-lug-hinge production processing die comprises a blank making die, a pre-forging die and a finish forging die, wherein the pre-forging die and the finish forging die are arranged on a set of combined die together, and the combined die comprises a lower forging die and an upper forging die;

the blank making die comprises a lower material upsetting die and an upper material upsetting die, wherein the lower material upsetting die is provided with a first cavity with an upward opening, the upper material upsetting die is provided with a second cavity for accommodating a bar, and the second cavity is downward in opening;

a pre-forging lower impression and a finish-forging lower impression are arranged on the right side of the lower forging die, a material distributing bulge is arranged at the front part of the pre-forging lower impression, and a positioning groove is arranged at the rear part of the pre-forging lower impression; a resistance groove is arranged outside the positioning groove;

and the upper forging die is provided with a pre-forging upper die cavity and a finish-forging upper die cavity which are matched with the pre-forging lower die cavity and the finish-forging lower die cavity.

Preferably, a positioning part is arranged at the top in the first cavity, and a wedge-shaped material splitting table is arranged at the bottom in the second cavity.

Preferably, the pre-forging lower die cavity is U-shaped.

Preferably, the finish forging lower die cavity is arranged on one side of the pre-forging lower die cavity, and a cavity of the finish forging lower die cavity is matched with the shape of the double-lug hinge.

Preferably, the assembly groove is formed in the surface of the upper material upsetting die of the double-lug strand production and processing die, the telescopic component is arranged in the assembly groove, and the assembly pin is fixed at the bottom of the lower material upsetting die and right above the assembly groove.

Preferably, in the process of upsetting, the lower upsetting die moves up and down to be assembled with the upper upsetting die, upsetting operation is performed on the bar stock, and the assembling pin is inserted into the assembling groove.

Preferably, the preforging lower impression and the preforging upper impression are 2-5mm higher than the final forging lower impression and the final forging upper impression, the preforging lower impression and the preforging upper impression are 1-2mm smaller than the width of the final forging lower impression and the final forging upper impression, and the tilt angles of the preforging lower impression and the pre forging upper impression and the final forging lower impression and the final forging upper impression are the same.

The invention also discloses a forging method of the double-lug hank, which comprises the following specific steps:

step one, placing qualified raw materials on a band sawing machine according to drawing requirements, adjusting and positioning, and starting the band sawing machine to cut to obtain bars with required sizes;

step two, loading the qualified bars into a shot blasting machine, starting the shot blasting machine after confirming that all process parameters are correct, and taking out the bars for inspection after shot blasting is finished;

step three, coating lime slurry on one end face of the bar, and then placing the bar into an intermediate frequency furnace for heating, wherein the heating temperature is 1150-;

vertically placing the bar stock with qualified temperature into a blank making mold, starting a pressure machine to make a blank, taking the blank after the blank is made out of the blank making mold, and removing oxide skin of the blank by using compressed air;

placing the blank on a pre-forging die, starting an electro-hydraulic hammer to strike the blank into a pre-forging piece, striking the pre-forging piece by 9 hammers, wherein the striking energy of each hammer is carried out according to the design requirement, and the compressed air is used for blowing off the die cavity and the oxide skin of the workpiece in the process of striking gaps by each hammer;

taking out the pre-forging piece from the pre-forging die and blowing the pre-forging piece completely, putting the pre-forging piece into a finish forging die for finish forging, wherein the finish forging strikes for 3 hammers, the striking energy of each hammer is carried out according to the design requirement, a die cavity and workpiece oxide skin are blown off by compressed air in the process of striking a gap by each hammer, and the finish forging piece is taken out after the shape and the surface oxide skin of the forging piece are qualified;

step seven, placing the finish forging on a trimming die, enabling the outline to be attached to the die cavity, then trimming, and taking out after checking no defect;

and step eight, loading the forged piece after the flash is cut into a shot blasting machine, starting the shot blasting machine after confirming that all process parameters are correct, taking out the forged piece after the shot blasting is finished, and carrying out appearance inspection.

Preferably, in the second step, a 600kg shot blasting machine is adopted, the current of the shot blasting machine is 20-28A when the shot blasting machine is loaded for no more than 10kg each time, the shot blasting time is 3-5min, and the appearance is inspected after shot blasting, so that the surface has no defects of cracks, oxide skin, residual oil stains, serious damage, missed blasting and the like.

Preferably, in the fifth step and the sixth step, a 125KJ electro-hydraulic hammer is adopted, and the die is placed into a heating furnace for preheating before forging, wherein the preheating temperature is 350 ℃, and the preheating is carried out for at least 3 hours; before forging, the side surface of the die must be slowly baked by large-area flame, and the preheating temperature of the die is kept; the graphite emulsion release agent is prepared according to the ratio of 25:1, and is added into a storage tank after being uniformly stirred.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention adopts integral die forging forming, comprising a blank making die, a pre-forging die and a finish forging die, thereby greatly improving the material utilization rate, shortening the processing process of the double-lug strand in the forging process, reducing the workload of forging, and greatly improving the production efficiency of the double-lug strand;

2. the invention adopts the fractional forging of blank making, pre-forging and finish forging, and is also provided with the positioning groove and the resistance groove, thereby reducing the metal flow resistance of a material part in the forging process, reducing the bearing capacity of a die, avoiding the material waste, having high forming precision and improving the integral quality of a product;

3. according to the invention, the lower blanking die and the upper blanking die on the blank making die are provided with the assembling groove and the assembling pin, so that the upper blanking die and the lower blanking die are precisely assembled in the blank making process of the bar, the blank making efficiency and the blank making effect are improved, in addition, the assembling groove is also internally provided with the telescopic member, the mould removing efficiency is improved due to the elastic action of the telescopic member, and the use is convenient.

Drawings

FIG. 1 is a structural cross-sectional view of an upper blanking die of the blank making die of the present invention;

FIG. 2 is a bottom view of the blank mold of the present invention; a

FIG. 3 is a sectional view showing the structure of a lower heading die of the blank mold according to the present invention;

FIG. 4 is a top view of the lower pier of the blank mold of the present invention;

FIG. 5 is a schematic view of the structural assembly of the upper blanking die and the lower blanking die in the present invention;

FIG. 6 is a schematic side view of a preforging die and a finisher in the present invention;

FIG. 7 is another schematic side view of the preforging and finisher dies of the present invention;

FIG. 8 is a schematic view of the structural assembly of an upper blanking die and a lower blanking die according to another embodiment of the present invention;

fig. 9 is an enlarged view of the structure at a in fig. 8.

1. Blanking a material die; 101. a first cavity; 102. a positioning part; 103. assembling a pin;

2. feeding a material upsetting die; 201. a second cavity; 202. a material splitting table; 203. assembling a groove; 204. a telescoping member;

3. a lower forging die; 301. pre-forging a lower die cavity; 302. distributing bulges; 303. positioning a groove; 304. resistance grooves; 305. finish forging to lower the impression;

4. an upper forging die; 401. pre-forging and setting a die cavity; 402. and finally forging the die cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1 to 7, which are schematic structural diagrams of a double-lug-twisted production processing die in the present invention, the double-lug-twisted production processing die in the present embodiment includes a blank making die, a blocker and a finisher, the blocker and the finisher are disposed on a set of combined die, and the combined die includes a lower forging die 3 and an upper forging die 4.

As shown in fig. 1-5, which are schematic structural diagrams of the blank making mold in this embodiment, the blank making mold in this embodiment includes a lower blank making mold 1 and an upper blank making mold 2, a first cavity 101 with an upward opening is formed on the lower blank making mold 1, and a positioning portion 102 is formed at the top inside the first cavity 101; through setting up this structure, the volume of misplacing is not more than 3mm when guaranteeing the product system base. The upper material upsetting die 2 is provided with a second cavity 201 for accommodating a bar, the second cavity 201 is provided with a downward opening, a wedge-shaped material splitting table 202 is arranged at the bottom of the second cavity 201, and the material splitting table 202 is used for pre-splitting the bar. By the arrangement of the structure, the blanking weight of each product is saved by 3 kg.

In this embodiment, a pre-forging lower die cavity 301 and a finish-forging lower die cavity 305 are arranged on the right side of the lower forging die 3, the pre-forging lower die cavity 301 is U-shaped, a material distributing protrusion 302 is arranged at the front of the pre-forging lower die cavity 301, and a positioning groove 303 is arranged at the rear of the pre-forging lower die cavity 301 to ensure that the position of the blank is relatively fixed during pre-forging of the product. A resistance groove 304 is arranged outside the positioning groove 303; because the bridging parts of the double-lug hinges are made of more materials, partial materials can flow out of the die cavity at the bridging parts during pre-forging, the resistance groove 304 structure is specially arranged for forcing metal to fill the die cavity, and the metal is effectively prevented from flowing outwards. The finish forging lower die cavity 305 is arranged on one side of the pre-forging lower die cavity 301, and a cavity of the finish forging lower die cavity 305 is matched with the shape of the double-lug hinge;

and the upper forging die 4 is provided with a preforging upper die cavity 401 and a finish forging upper die cavity 402 which are matched with the preforging lower die cavity 301 and the finish forging lower die cavity 305.

The flow condition of metal can be well improved by arranging the preforging die, and the forging piece is prevented from being folded; the blank is easy to fill the cavity, and the defect of insufficient filling on the forging is avoided; reduce the wear of the finish forging impression and prolong the service life of the forging die.

In order to ensure the full forging forming, the blank after the pre-forging is mainly formed by upsetting during the finish forging, the pre-forging lower die cavity 301 and the pre-forging upper die cavity 401 are 2-5mm higher than the finish forging lower die cavity 305 and the finish forging upper die cavity 402, and the widths of the pre-forging lower die cavity 301 and the pre-forging upper die cavity 401 are 1-2mm smaller than the widths of the finish forging lower die cavity 305 and the finish forging upper die cavity 402. The inclination angles of the pre-forging lower die cavity 301, the pre-forging upper die cavity 401, the final forging lower die cavity 305 and the final forging upper die cavity 402 are the same, and the difficult-to-fill part is increased by 2-3 degrees.

The invention adopts integral die forging molding, the material utilization rate reaches more than 90 percent, the processing process is shortened, and the production efficiency is improved; the method adopts the sectional forging of blank making, pre-forging and finish forging, reduces the metal flow resistance, reduces the bearing capacity of the die, has high forming precision and improves the overall quality of products.

Example 2

As shown in fig. 8 and 9, which are schematic views of an assembly structure of a lower blanking die 1 and an upper blanking die 2 according to another preferred embodiment of the present invention, on the basis of example 1, an assembly groove 203 is formed on the surface of the upper blanking die 2 of the double-lug strand production processing die, a telescopic member 204 is disposed inside the assembly groove 203, and the telescopic member 204 can be vertically stretched inside the assembly groove 203;

in this embodiment, be located lower mound material mould 1's bottom and be located assembly groove 203 and be fixed with assembly pin 103 directly over, at the in-process of mound material, lower mound material mould 1 reciprocate with last mound material mould 2 assembly, carry out the mound material operation to the bar, assembly pin 103 inserts assembly groove 203 in realized lower mound material mould 1 with last mound material mould 2 accurate positioning, improved the mound material effect.

Example 3

The embodiment provides a forging method of the double-lug skein, which comprises the following specific steps:

step one, placing the qualified raw materials on a band sawing machine according to the drawing requirements, adjusting and positioning, and then starting the band sawing machine to cut to obtain bars with required sizes.

Before the blanking, it is noted that the operator must check the condition of the equipment, in particular whether the fixed wheel is loose, and replace the saw blade with a new one. After blanking, removing burrs at two ends of the bar by using a file, and cleaning the cuttings of the section; and the first piece of each round steel is inspected to be qualified and then starts to be produced.

And step two, loading the qualified bars into a shot blasting machine, starting the shot blasting machine after confirming that all process parameters are correct, and taking out the bars for inspection after shot blasting is finished.

The shot blasting machine with the weight of 600kg is adopted, the charging is not more than 10kg each time, the current of the shot blasting machine is 20-28A, the shot blasting time is 3-5min, and the appearance inspection is carried out after the shot blasting, so that the defects of no crack, no oxide skin, no residual oil stain, no serious damage, no spray leakage and the like on the surface are overcome.

Step three, coating lime slurry on one end face of the bar stock, and then placing the bar stock into an intermediate frequency furnace for heating, wherein the heating temperature is 1150-.

Before heating the raw material, carrying out equipment point inspection on the intermediate frequency induction heating furnace, and confirming that a circuit and a cooling system are intact and the operation is normal; before the formal product bar stock is put into the furnace, at least 3 guide materials (waste materials or hot mold materials) are placed, and the guide materials are put into a waste material barrel after being taken out of the furnace; before the production on duty is finished, the bar stock in the heating furnace needs to be led out by using wood, and the forging process is finished.

And step four, vertically placing the bar stock with qualified temperature into a blank making mold, starting a pressure machine to make a blank, taking the blank after blank making out of the blank making mold, and removing oxide skin of the blank by using compressed air.

A 400T single-point press is adopted, a blank making mold is heated to 100 ℃ before operation, and a small amount of butter is coated on the blank making upper mold before blank making; scrapping the overtemperature materials; uniformly heating and forging the material with the forging temperature lower than the required forging temperature for the second time before the normal forging of the batch is finished, and storing the material and the primary heating and forging blank in an isolated way and independently turning the material; paying attention to the working condition of the temperature measuring system at any time, and stopping the machine for processing when abnormality is found; the whole material is lightly taken and lightly placed in the heating process, and collision is strictly prohibited.

And fifthly, placing the blank on a pre-forging die, starting an electro-hydraulic hammer to strike the blank into a pre-forged part, striking the pre-forged part by 9 hammers, wherein the striking energy of each hammer is carried out according to the design requirement, and the compressed air is used for blowing off the die cavity and the oxide skin of the workpiece in the process of striking the gap by each hammer.

Adopting a 125KJ electro-hydraulic hammer, putting the die into a heating furnace for preheating before forging, wherein the preheating temperature is 350 ℃, and the preheating is carried out for more than 3 hours; before forging, the side surface of the die must be slowly baked by large-area flame, and the preheating temperature of the die is kept; the preparation method comprises the following steps of (1) preparing a graphite emulsion release agent according to a ratio of 25:1, uniformly stirring, adding into a storage tank, and before forging, checking smooth spraying of the graphite emulsion to achieve uniform and sufficient spraying effect; the forging preparation process must carefully check the equipment operating conditions, particularly the control system.

And sixthly, taking out the pre-forging piece from the pre-forging die and blowing off the pre-forging piece, putting the pre-forging piece into a finish forging die for finish forging, striking 3 hammers for finish forging, striking energy of each hammer is carried out according to design requirements, blowing off a die cavity and workpiece oxide skin by using compressed air in the process of striking a gap by each hammer, and taking out the finish forging piece after the shape and the surface oxide skin of the forging piece are qualified.

Adopting a 125KJ electro-hydraulic hammer, putting the die into a heating furnace for preheating before forging, wherein the preheating temperature is 350 ℃, and the preheating is carried out for more than 3 hours; before forging, the side surface of the die must be slowly baked by large-area flame, and the preheating temperature of the die is kept; the preparation method comprises the following steps of (1) preparing a graphite emulsion release agent according to a ratio of 25:1, uniformly stirring, adding into a storage tank, and before forging, checking smooth spraying of the graphite emulsion to achieve uniform and sufficient spraying effect; the forging preparation process must carefully check the operation of the equipment, particularly the control system and hydraulic system, for proper operation. The production can be continued after the first piece is qualified; the whole material is lightly taken and lightly placed in the heating process, and collision is strictly prohibited.

If the workpiece is stuck on the upper die in the finish forging process, the auxiliary forging worker needs to firstly place the anti-collision wood plate on the lower die and then assist the auxiliary forging worker in prying down the workpiece. If the workpiece is stuck, the stuck die cavity needs to be cooled by compressed air. And after the forging worker visually inspects the shape and the surface oxide scale of the final forging piece to be qualified, putting the workpiece into a transmission chain to the next procedure, and finishing the forging forming procedure. In the forging process, the auxiliary forging worker can place a blank and a pre-forging piece and assist in prying the workpiece under the condition that the workpiece is stuck with a die in the whole process.

And step seven, placing the finish forging on a trimming die to enable the contour to be attached to the die cavity, then trimming, and taking out after checking no defect.

A 400T double-point press is adopted, whether the equipment operates normally is checked before trimming, the key size of the trimming die must be checked by a die class before the trimming die is used, and the trimming die can be used after the key size is checked to be qualified; and (4) preheating the trimming die before trimming at the preheating temperature of 100 ℃ and keeping the preheating temperature until trimming is started.

And step eight, loading the forged piece after the flash is cut into a shot blasting machine, starting the shot blasting machine after confirming that all process parameters are correct, taking out the forged piece after the shot blasting is finished, and carrying out appearance inspection.

The method is characterized in that a 600kg shot blasting machine is adopted, 10-12kg of shot blasting machine is loaded each time, the current of the shot blasting machine is 20-25A, the shot blasting time is 3-5min, and appearance inspection is carried out after shot blasting, so that the defects of no crack, no oxide skin, no residual oil stain, no serious damage, no jet leakage and the like on the surface are overcome.

The parts not involved in the present invention are the same as or can be implemented by the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.