CN114589279A - Method and apparatus for manufacturing workpiece - Google Patents
Method and apparatus for manufacturing workpiece Download PDFInfo
- Publication number
- CN114589279A CN114589279A CN202111046442.6A CN202111046442A CN114589279A CN 114589279 A CN114589279 A CN 114589279A CN 202111046442 A CN202111046442 A CN 202111046442A CN 114589279 A CN114589279 A CN 114589279A
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- workpiece
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- forging
- cooling
- surface treatment
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000005242 forging Methods 0.000 claims abstract description 62
- 238000001816 cooling Methods 0.000 claims abstract description 57
- 238000010273 cold forging Methods 0.000 claims abstract description 52
- 238000004381 surface treatment Methods 0.000 claims abstract description 40
- 238000005422 blasting Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000003507 refrigerant Substances 0.000 claims description 14
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000005488 sandblasting Methods 0.000 description 5
- 238000005480 shot peening Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003303 reheating Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The present disclosure relates to a method and an apparatus for manufacturing a workpiece, the method including: a hot forging step of heating the workpiece to a hot forging temperature and then forging the workpiece; a cooling step of cooling only a part of the workpiece including a first part to be cold forged, out of the workpieces, to a blasting temperature lower than a cold forging temperature after the hot forging step; a surface treatment step of performing blasting on the first portion at the blasting temperature; a temperature raising step of raising the temperature of the first portion to a cold forging temperature using residual heat at the time of hot forging of a second portion that is a portion other than the portion of the workpiece after the surface treatment step; and a cold forging step of forging the first portion at the cold forging temperature.
Description
Technical Field
The present disclosure relates to a method and an apparatus for manufacturing a workpiece.
Background
Japanese patent application laid-open No. 2013-146769 discloses a method for manufacturing a shaft member of a rolling bearing device for a wheel, in which a hot forging is performed, a shot peening is performed, and then a cold forging is performed.
Disclosure of Invention
When the shot blasting is performed, dust flies in the apparatus. Therefore, after hot forging, the workpiece is cooled to a low temperature and shot peening is performed. The temperature of the workpiece in the cold forging to be performed thereafter is higher than that in the shot blasting. Therefore, the temperature of the workpiece is temporarily lowered for shot peening, and then, the temperature of the workpiece is raised at the time of cold forging. Therefore, there is a problem in that energy loss is large.
The present disclosure may be implemented in the following manner.
(1) According to an aspect of the present disclosure, a method of manufacturing a workpiece is provided. The method for manufacturing a workpiece includes: a hot forging step of heating the workpiece to a hot forging temperature and then forging the workpiece; a cooling step of cooling only a part of the workpiece including a first part to be cold forged, out of the workpieces, to a blasting temperature lower than a cold forging temperature after the hot forging step; a surface treatment step of performing blasting on the first portion at the blasting temperature; a temperature raising step of raising the temperature of the first portion to a cold forging temperature using residual heat at the time of hot forging of a second portion that is a portion other than the portion of the workpiece after the surface treatment step; and a cold forging step of forging the first portion at the cold forging temperature. According to this aspect, the temperature of the first portion is increased by the heat of the hot forging remaining in the second portion, and therefore, the energy loss can be reduced. (2) In the above aspect, in the cooling step, the first portion may be cooled by bringing a cooling jig into contact with at least a part of the first portion. According to this aspect, since the cooling jig is used, the portion to be cooled can be limited.
(3) In the above aspect, in the cooling step, the first portion may be cooled by causing the refrigerant jetted from the nozzle to contact at least a part of the first portion. According to this mode, the first portion can be cooled regardless of the shape of the first portion.
(4) In the above aspect, the workpiece may be continuously conveyed from a hot forging apparatus that performs the hot forging step to a surface treatment apparatus that performs the surface treatment step, and the cooling step may be performed while the workpiece is being conveyed. According to this aspect, the workpiece can be cooled by continuously performing the hot forging process to the surface treatment process as a series of steps.
(5) In the above aspect, a holding jig for covering the second portion may be used in the surface treatment step. According to this aspect, the second portion can be suppressed from being processed in the surface treatment step.
(6) In the above aspect, the holding jig may have a hole having a cross-sectional shape at a boundary between the first portion and the second portion of the workpiece, and the second portion may be fitted into the hole. According to this mode, since the second portion is fitted into the hole of the holding jig, the second portion can be protected with a simple structure.
(7) According to an aspect of the present disclosure, there is provided a manufacturing apparatus of a workpiece. The apparatus for manufacturing a workpiece includes: a conveying device which conveys a workpiece; a hot forging device for heating the workpiece to a hot forging temperature and forging the workpiece; a cooling device for cooling only a part of the workpiece including a first part to be cold forged to a blast processing temperature; a surface treatment device for performing a sand blast process on the first portion; and a cold forging device for forging the first portion, wherein the hot forging device, the cooling device, the surface treatment device, and the cold forging device are arranged in this order from an upstream side to a downstream side of the transport device, the surface treatment device and the cold forging device are arranged at a predetermined interval, and residual heat during hot forging of a second portion, which is a portion other than the first portion, is transferred to the first portion while the workpiece is transported from the surface treatment device to the cold forging device. According to this aspect, since the surface treatment device and the cold forging device are disposed at a predetermined interval, the residual heat of the hot forging remaining in the second portion is transferred to the first portion while the workpiece is conveyed from the surface treatment device to the cold forging device, and thus the energy loss can be reduced.
(8) In the above aspect, the cooling device may include a cooling jig that cools the first portion, and the cooling jig may be brought into contact with at least a part of the first portion to cool the first portion. According to this aspect, since the cooling jig is used, the portion to be cooled can be limited.
(9) In the above aspect, the cooling device may include a nozzle that ejects the refrigerant, and the first portion may be cooled by causing the refrigerant ejected from the nozzle to contact at least a part of the first portion. According to this mode, the first portion can be cooled regardless of the shape of the first portion.
(10) In the above aspect, the surface treatment apparatus includes a holding jig that covers the second portion. According to this aspect, the second portion can be suppressed from being processed in the surface treatment step.
(11) In the above aspect, the holding jig may have a hole having a cross-sectional shape at a boundary between the first portion and the second portion of the workpiece, and the second portion may be fitted into the hole. According to this aspect, since the portion other than the first portion is fitted into the hole of the holding jig, the second portion can be protected with a simple structure.
The present disclosure may be implemented in various ways other than the manufacturing method and manufacturing apparatus of the workpiece. For example, the forging method and the forging apparatus can be used for the workpiece.
Drawings
Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals illustrate like elements.
Fig. 1 is an explanatory diagram illustrating a workpiece manufacturing apparatus.
Fig. 2 is an explanatory diagram illustrating an example of the workpiece.
Fig. 3 is an explanatory diagram illustrating a method of manufacturing a workpiece.
Fig. 4 is an explanatory diagram showing a change in temperature of the workpiece.
Fig. 5 is an explanatory view showing the workpiece and the cooling jig.
Fig. 6 is an explanatory diagram showing a workpiece and a nozzle.
Fig. 7 is an explanatory diagram showing the workpiece and the holding jig.
Fig. 8 is an explanatory diagram showing the workpiece and the holding jig.
Detailed Description
First embodiment
Fig. 1 is an explanatory diagram illustrating a manufacturing apparatus 10 of a workpiece 100. The manufacturing apparatus 10 includes: a conveying device 20 for conveying the workpiece 100 from upstream to downstream, a heating device 30, a hot forging device 40, a cooling device 50, a surface treatment device 60, and a cold forging device 70, which are arranged in this order from the upstream side to the downstream side of the conveying device 20. The surface treatment device 60 and the cold forging device 70 are disposed at a predetermined interval, and no device for performing a treatment on the workpiece 100 is disposed therebetween. In the present embodiment, the conveying device 20 is, for example, a conveyor, and the workpiece 100 is placed on the conveying device 20 and continuously conveyed from the heating device 30 to the cold forging device 70. As the conveyance device 20, a robot arm may be used.
The heating device 30 heats the workpiece 100 to a hot forging temperature equal to or higher than the transformation point temperature of the material constituting the workpiece 100, for example, to 1000 to 1300 ℃.
The hot forging device 40 performs a hot forging process of forging the heated workpiece 100.
The cooling device 50 performs a cooling process of cooling the workpiece 100 to a blasting temperature lower than the cold forging temperature. In the blasting, since dust is generated, the blasting temperature is preferably a temperature of, for example, less than 100 ℃. In addition, the cold forging temperature is 100-150 ℃. In addition, in the sandblasting, as described later, since particles called shots collide with each other, the temperature of the workpiece 100 rises. Therefore, it is preferable that the cooling device cools the workpiece 100 to such a temperature that the temperature of the workpiece 100 does not exceed 100 ℃ at the time of the blast processing.
As described above, in the hot forging process, the temperature of the workpiece 100 is heated to 1000 to 1300 ℃. Therefore, an oxide film (also referred to as "scale") is formed on the surface of the workpiece 100. The surface treatment device 60 performs a surface treatment process of removing an oxide film generated on the surface of the workpiece 100 by causing particles called shots to collide with the workpiece 100. Blast machining (blasting) is a generic term for shot blasting (shot blasting) using fine steel balls as the projection material, sanding (sand blasting) using silica sand, and blast machining (grit blasting) using iron particles formed into an acute angle shape, and the like, and an appropriate projection material is selected according to the purpose of machining. In the present embodiment, the oxide film generated on the surface of the first portion 100a of the workpiece 100 is removed by shot peening. In the present embodiment, sand blast (sand blast) processing or shot blasting may be performed.
The cold forging device 70 performs a cold forging process of forging the workpiece 100 at a temperature of 100 to 150 ℃.
Fig. 2 is an explanatory diagram illustrating an example of the workpiece 100. The workpiece 100 is formed of metal and includes a first portion 100a and a second portion 100 b. The first portion 100a is a portion subjected to the sand blasting and the cold forging, and the second portion 100b is a portion not subjected to the sand blasting and the cold forging.
Fig. 3 is an explanatory diagram illustrating a method of manufacturing the work 100. Fig. 4 is an explanatory diagram showing a change in temperature of the workpiece 100. In step S10 from time t0 to t1, the heating device 30 heats the entire workpiece 100 moving on the belt conveyor 20. Therefore, the overall temperature of the workpiece 100 rises. When the temperature of the workpiece 100 reaches 1000 to 1300 ℃, the workpiece 100 on the belt conveyor 20 comes out of the heating device 30 into the hot forging device 40, and the process shifts to step S20.
In step S20 at time t1 to t2, the hot forging apparatus 40 performs a hot forging process of performing hot forging on the workpiece 100. In the hot forging process, the workpiece 100 receives collision energy by forging, but the temperature of the workpiece 100 is high, and the temperature of the workpiece 100 is slightly lowered by the balance between the two. After the hot forging process is completed, the workpiece 100 on the belt conveyor 20 exits the hot forging apparatus 40, enters the cooling apparatus 50, and the process proceeds to step S30.
Since the temperature changes of the first portion 100a and the second portion 100b of the workpiece 100 are not the same, the temperature changes of the first portion 100a and the second portion 100b are separately described.
First, the first portion 100a will be explained. In step S30 at time t2 to t3 after the hot forging process in step S20, the cooling apparatus 50 performs a cooling process of forcibly cooling a portion of the workpiece 100 including at least a part of the first portion 100a of the workpiece 100. The "part of the workpiece 100 including at least a part of the first portion 100a of the workpiece 100" may be at least a part of the first portion 100a to be cold forged, or may be a part larger than the first portion 100a to be cold forged by a predetermined range. Fig. 5 is an explanatory diagram showing the workpiece 100 and the cooling jig 52. The cooling jig 52 is cooled to a temperature lower than the cold forging temperature. The cooling device 50 brings the cooling jig 52 into contact with the first portion 100a of the workpiece 100 from the inside and outside of the first portion 100a to cool the first portion of the workpiece 100. Since the cooling jig 52 does not contact the second portion 100b, the first portion 100a can be cooled without cooling the second portion 100 b. At time t3, when the temperature of the first part 100a of the workpiece 100 is less than 100 ℃, and reaches a temperature suitable for the blast processing, the workpiece 100 on the belt conveyor 20 comes out of the cooling device 50 after the cooling jig 52 is removed, enters the surface treatment device 60, and the process shifts to step S40. The cooling jig 52 does not need to be in contact with the entire surface of the first portion 100a, and may be in contact with the first portion 100a so that the temperature of the entire first portion 100a is reduced to the blasting temperature. The cooling jig 52 may slightly contact the second portion 100 b.
In step S40 at time t3 to t4 after the cooling process of step S30, the surface treatment apparatus 60 performs a surface treatment process of removing the oxide film generated on the surface of the first portion 100a of the workpiece 100 by shot peening. After the oxide film is removed, the workpiece 100 on the transport device 20 comes out of the surface treatment device 60, and the process proceeds to step S50. In addition, in the sandblasting process, since the cooling jig 52 is removed, the temperature of the first portion 100a of the workpiece 100 slightly rises due to heat conduction from the second portion 100 b.
In step S50 from time t4 to t5 after the surface treatment process of step S40, the workpiece 100 on the conveying device 20 is moved to the cold forging device 70. During this time, since the heat remaining in the second portion 100b is conducted to the first portion 100a, the temperature of the first portion 100a of the workpiece 100 rises. That is, step S50 is a temperature raising step of raising the temperature of the first portion 100a to the cold forging temperature by the residual heat of the hot forging temperature remaining in the second portion 100 b. When the temperature is raised to the cold forging temperature by the heat remaining in the second portion 100b, the temperature may be raised only by the heat remaining in the second portion 100b, or may be raised by heating with a heater or the like in an auxiliary manner. The auxiliary heating may be performed not only when the total amount of residual heat cannot satisfy the temperature increase demand of the second portion but also when the temperature increase demand of the second portion can be satisfied, for example, to shorten the temperature increase time. A heater or the like may be provided between the surface treatment device 60 and the cold forging device 70.
Next, the second portion 100b will be explained. In step S60 from time t2 to t5, the second portion 100b of the workpiece 100 is naturally cooled. "Natural cooldown of the second portion 100 b" means that the second portion 100b is not forcibly cooled. Further, as described above, the first portion 100a of the workpiece 100 is connected to the second portion 100 b. Therefore, when the first portion 100a is cooled by the cooling jig 52 of the cooling device 50, the temperature of the first portion 100a is lower than that of the second portion 100 b. Therefore, while the temperature of the first portion 100a is lower than that of the second portion 100b, the second portion 100b is lowered in temperature by natural cooling and heat conduction to the first portion 100 a. However, the temperature of the second portion 100b is not lower than the temperature of the first portion 100 a.
By time t5, the temperature of first portion 100a is raised to a cold forging temperature suitable for cold forging. The workpiece 100 enters the cold forging apparatus 70, and the process proceeds to step S70. The temperature of the first portion 100a may be lower than the temperature of the second portion 100b, and as shown in fig. 4, the temperature of the first portion 100a and the temperature of the second portion 100b may be substantially the same temperature.
In step S70 at time t5 to t6 after the temperature raising step of step S50, the cold forging apparatus 70 performs a cold forging step of forging the first portion 100a of the workpiece. Further, fig. 4 is a graph in which the temperature of the workpiece 100 hardly changes during the cold forging process, but the temperature of the workpiece 100 changes due to the balance of heat dissipation from the workpiece 100 to the atmosphere and collision energy received by forging. After the cold forging process is completed, the workpiece 100 is separated from the cold forging apparatus 70, and the process proceeds to step S80.
In step S80 from time t6 to t7, the workpiece 100 is naturally cooled.
As described above, according to the first embodiment, the surface treatment device 60 and the cold forging device 70 are disposed at a predetermined interval. Therefore, during the period from the exit of the workpiece 100 on the transport apparatus 20 from the surface treatment apparatus 60 to the entrance to the cold forging apparatus 70 in step S70, a temperature raising step of raising the temperature of the first portion 100a to the cold forging temperature by the residual heat of the hot forging temperature remaining in the second portion 100b is performed. Therefore, the first portion 100a does not need to be reheated by a heater, and no energy loss occurs. As described above, the surface treatment device 60 and the cold forging device 70 are disposed at a predetermined interval, and the predetermined interval may be an interval necessary for the heat of the second portion 100b of the workpiece 100 to be conducted to the first portion 100a and for the temperature of the first portion 100a to be increased to the cold forging temperature. Further, according to the present embodiment, since the temperature of the second portion 100b does not decrease to the blasting temperature, even when reheating the first portion 100a, the reheating energy for reheating the first portion 100a can be reduced as compared with the case where the temperature of the second portion 100b is decreased to the blasting temperature.
Second embodiment
Fig. 6 is an explanatory diagram showing the workpiece 100 and the nozzle 54. In the first embodiment, the cooling apparatus 50 cools the first portion 100a by bringing the cooling jig 52 into contact with the first portion 100a of the workpiece 100, but in the second embodiment, the first portion 100a is cooled by spraying the refrigerant 55 from the nozzle 54 to the first portion 100 a. As the refrigerant 55, nitrogen gas or carbon dioxide gas can be used. The low-temperature refrigerant 55 may be prepared to be brought into contact with the first portion 100a, or the high-pressure refrigerant 55 may be injected from the nozzle 54 to be adiabatically expanded to lower the temperature of the refrigerant 55 and be brought into contact with the first portion 100 a.
According to the second embodiment, since the first portion 100a is cooled using the refrigerant 55 injected from the nozzle 54, the first portion 100a can be cooled even if the shape of the first portion 100a is complicated.
Fig. 7 and 8 are explanatory views showing the workpiece 100 and the holding jig 62. Fig. 7 shows a cross section of the workpiece 100 and the holding jig 62 cut by a plane passing through the central axis O of the workpiece 100 and the holding jig 62, and fig. 8 shows a cross section of the workpiece 100 and the holding jig 62 cut by a plane perpendicular to the central axis O. The holding jig 62 used in the present embodiment includes: a cylindrical portion 62a having an opening 62b on one side, a bottom surface 62c provided on the opposite side of the cylindrical portion 62a from the opening 62b, and a hole 62d formed in the bottom surface 62 c. The hole 62d corresponds to the shape of the cross section perpendicular to the central axis O at the boundary between the first portion 100a and the second portion 100b of the workpiece 100, and the holding jig 62 can receive the workpiece in a state where the first portion 100a of the workpiece 100 is exposed to the outside of the holding jig 62 and the second portion 100b is fitted into the holding jig 62.
Since the holding jig 62 covers the second portion 100b of the workpiece 100, particles called shots contact the first portion 100a of the workpiece 100 but do not contact the second portion 100b during the blasting process, and thus only the oxide film of the first portion 100a can be removed. That is, the second portion 100b can be suppressed from being sandblasted by the holding jig 62.
The holding jig 62 may also be used in the cooling device 50. For example, when the first portion 100a is cooled by the refrigerant 55 injected from the nozzle 54, the holding jig 62 does not allow the refrigerant 55 to contact the second portion 100b, so that the heat in the hot forging step can be held in the second portion 100b, and the heat in the second portion 100b can be conducted to the first portion 100a in the temperature increasing step of step S50 to increase the temperature of the first portion 100 a.
The present disclosure is not limited to the above-described embodiments, and may be implemented in various configurations without departing from the spirit of the present disclosure. For example, in order to solve part or all of the above-described problems or to achieve part or all of the above-described effects, the technical features of the embodiments corresponding to the technical features of the respective aspects described in the summary of the invention may be appropriately replaced or combined. In addition, if this technical feature is not described as an essential matter in this specification, it can be deleted as appropriate.
Claims (11)
1. A method for manufacturing a workpiece includes:
a hot forging step of heating the workpiece to a hot forging temperature and then forging the workpiece;
a cooling step of cooling only a part of the workpiece including a first part to be cold forged, of the workpieces, to a blasting temperature lower than a cold forging temperature after the hot forging step;
a surface treatment step of performing blasting on the first portion at the blasting temperature;
a temperature raising step of raising a temperature of the first portion to a cold forging temperature using residual heat at the time of hot forging of a second portion that is a portion other than the portion of the workpiece after the surface treatment step; and
and a cold forging step of forging the first portion at the cold forging temperature.
2. The method of manufacturing a workpiece according to claim 1, wherein in the cooling step, the first portion is cooled by bringing a cooling jig into contact with at least a part of the first portion.
3. The method of manufacturing a workpiece according to claim 1, wherein in the cooling step, the first portion is cooled by causing a refrigerant jetted from a nozzle to impinge on at least a part of the first portion.
4. The method of manufacturing a workpiece according to any one of claims 1 to 3, wherein the workpiece is continuously conveyed between a hot forging apparatus that performs the hot forging step and a surface treatment apparatus that performs the surface treatment step, and the cooling step is performed while the workpiece is conveyed.
5. The method of manufacturing a workpiece according to any one of claims 1 to 4, wherein a holding jig covering the second portion is used in the surface treatment process.
6. The method of manufacturing a workpiece according to claim 5, wherein the holding jig has a hole in the shape of a cross section at the intersection of the first part and the second part of the workpiece, and the second part is fitted into the hole.
7. An apparatus for manufacturing a workpiece, comprising:
a conveying device which conveys a workpiece;
a hot forging device for heating the workpiece to a hot forging temperature and then forging the workpiece;
a cooling device that cools only a portion of the workpiece including a first portion to be cold forged, among the workpieces, to a blast processing temperature;
a surface treatment device that performs a blasting process on the first portion; and
a cold forging device that performs forging of the first portion,
wherein the hot forging device, the cooling device, the surface treatment device, and the cold forging device are arranged in this order from an upstream side to a downstream side of the conveying device,
the surface treatment device and the cold forging device are arranged at a predetermined interval,
during the conveyance of the workpiece from the surface treatment apparatus to the cold forging apparatus, conduction of residual heat at the time of hot forging of a second portion that is a portion other than the one portion to the first portion is achieved.
8. The apparatus for manufacturing a workpiece according to claim 7, wherein the cooling device has a cooling jig that cools the first portion, and the cooling jig is brought into contact with at least a part of the first portion to cool the first portion.
9. The apparatus for manufacturing a workpiece according to claim 7, wherein the cooling device has a nozzle that ejects the refrigerant, and the first portion is cooled by causing the refrigerant ejected from the nozzle to strike at least a part of the first portion.
10. The apparatus for manufacturing a workpiece according to any one of claims 7 to 9, wherein the surface treatment apparatus has a holding jig covering the second portion.
11. The apparatus for manufacturing a workpiece according to claim 10, wherein the holding jig has a hole in a cross-sectional shape at an intersection of the first portion and the second portion of the workpiece, and the second portion is fitted into the hole.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-200782 | 2020-12-03 | ||
| JP2020200782A JP7567412B2 (en) | 2020-12-03 | 2020-12-03 | Workpiece manufacturing method and manufacturing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114589279A true CN114589279A (en) | 2022-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111046442.6A Pending CN114589279A (en) | 2020-12-03 | 2021-09-03 | Method and apparatus for manufacturing workpiece |
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| Country | Link |
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| JP (1) | JP7567412B2 (en) |
| CN (1) | CN114589279A (en) |
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| JP7567412B2 (en) | 2024-10-16 |
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