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JP7567412B2 - Workpiece manufacturing method and manufacturing device - Google Patents
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JP7567412B2 - Workpiece manufacturing method and manufacturing device - Google Patents

Workpiece manufacturing method and manufacturing device Download PDF

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JP7567412B2
JP7567412B2 JP2020200782A JP2020200782A JP7567412B2 JP 7567412 B2 JP7567412 B2 JP 7567412B2 JP 2020200782 A JP2020200782 A JP 2020200782A JP 2020200782 A JP2020200782 A JP 2020200782A JP 7567412 B2 JP7567412 B2 JP 7567412B2
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workpiece
temperature
manufacturing
cooling
forging
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JP2022088768A (en
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泰明 福村
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Toyota Motor Corp
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Toyota Motor Corp
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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
    • 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)

Description

本開示は、ワークの製造方法及び製造装置に関する。 This disclosure relates to a method and apparatus for manufacturing a workpiece.

特許文献１には、熱間鍛造を行った後、ショットブラスト加工を行い、その後、冷間鍛造を行う車輪用転がり軸受装置の軸部材の製造方法が開示されている。 Patent Document 1 discloses a method for manufacturing a shaft member for a wheel rolling bearing device, which involves hot forging, shot blasting, and then cold forging.

特開２０１３－１４６７６９号公報JP 2013-146769 A

ショットブラスト加工を行うときには、装置内に粉塵が舞う。このため、熱間鍛造を行った後、ワークを低温に冷却して、ショットブラスト加工を行う。その後に行う冷間鍛造におけるワークの温度は、ショットブラストを行うときの温度よりも高い。従って、ショットブラスト加工のために一旦ワークの温度を下げ、その後、冷間鍛造時にワークの温度を上げている。そのため、エネルギーロスが大きいという課題があった。 When performing shot blasting, dust particles fly around inside the equipment. For this reason, after hot forging, the workpiece is cooled to a low temperature and then shot blasted. The temperature of the workpiece in the subsequent cold forging is higher than the temperature when shot blasting is performed. Therefore, the temperature of the workpiece is first lowered for shot blasting, and then raised during cold forging. This posed the problem of large energy losses.

本開示は、以下の形態として実現することが可能である。 This disclosure can be realized in the following forms:

（１）本開示の一形態によれば、ワークの製造方法が提供される。このワークの製造方法は、熱間鍛造温度まで昇温したワークを、熱間鍛造装置において、熱間鍛造する熱間鍛造工程と、前記熱間鍛造工程の後、前記ワークを移動し、前記ワークのうちの冷間鍛造を行う第１部分を含む前記ワークの一部分のみを冷間鍛造温度よりも低温のブラスト加工温度に冷却する冷却工程と、前記第１部分を含む前記ワークの一部分が前記ブラスト加工温度に冷却された後、前記冷却工程を終了し、前記ワークを表面処理装置に移動し、前記ブラスト加工温度で、前記第１部分の表面に対してブラスト加工を行う表面処理工程と、前記表面処理工程の後、前記ワークの前記一部分以外の部分である第２部分に残る熱間鍛造の時の残存熱を用いて前記第１部分の温度を冷間鍛造温度まで昇温させつつ、前記ワークを冷間鍛造装置に移動する昇温工程と、前記冷間鍛造装置において、前記冷間鍛造温度で前記第１部分の鍛造を行う冷間鍛造工程と、を備える、この形態によれば、第２部分に残る熱間鍛造の熱を用いて第１部分の温度を上昇させるので、エネルギーロスを低減できる。
（２）上記形態において、前記冷却工程では、前記第１部分の少なくとも一部に冷却用治具を接触させることで前記第１部分を冷却してもよい。この形態によれば、冷却用治具を用いるので、冷却する部分を限定できる。
（３）上記形態において、前記冷却工程では、ノズルから噴射された冷媒を、前記第１部分の少なくとも一部に当てることで前記第１部分を冷却してもよい。この形態によれば、第１部分の形状によらず第１部分を冷却できる。
（４）上記形態において、前記熱間鍛造工程を行う前記熱間鍛造装置から前記表面処理工程を行う表面処理装置までの間、前記ワークが連続して搬送され、前記ワークが搬送される間に前記冷却工程が実行されてもよい。この形態によれば、熱間鍛造工程から表面処理工程までを一連の工程として連続し、ワークを冷却できる。
（５）上記形態において、前記表面処理工程では、前記第２部分を覆う保持治具を用いてもよい。この形態によれば、第２部分が表面処理工程により処理されることを抑制できる。
（６）上記形態において、前記保持治具は、前記ワークの前記第１部分と前記第２部分の境界における断面の形状の穴を有し、前記穴の中に前記第２部分を嵌め込んでもよい。この形態によれば、第２部分が保持治具の穴の中に嵌め込まれるので、簡易な構成で第２部分を保護できる。
（７）本開示の一形態によれば、ワークの製造装置が提供される。このワークの製造装置は、ワークを搬送する搬送装置と、前記ワークを熱間鍛造温度まで昇温した後、熱間鍛造を行う熱間鍛造装置と、前記ワークのうちの冷間鍛造を行う第１部分を含む前記ワークの一部分のみをブラスト加工温度に冷却する冷却装置と、前記第１部分を含む前記ワークの一部分が前記ブラスト加工温度に冷却されたのち、前記冷却装置による冷却を終了し、前記第１部分の表面に対してブラスト加工を実行する表面処理装置と、前記第１部分の鍛造を行うと冷間鍛造装置と、を備え、前記熱間鍛造装置と、前記冷却装置と、前記表面処理装置と、前記冷間鍛造装置とは、前記搬送装置の上流側から下流側に向けて順次配置され、前記表面処理装置と前記冷間鍛造装置とは予め定めた間隔を空けて配置され、前記ワークを前記表面処理装置から前記冷間鍛造装置に搬送する搬送装置を設け、前記ワークを前記冷間鍛造装置に移動する間に、前記一部分以外の部分である第２部分に残る熱間鍛造の時の残存熱の前記第１部分への伝導を図り、前記第１部分の温度を冷間鍛造温度まで昇温する。この形態によれば、表面処理装置と冷間鍛造装置とは予め定めた間隔を空けて配置されているので、ワークが表面処理装置から冷間鍛造装置に搬送される間に、第２部分に残る熱間鍛造の残存熱の第１部分への伝導を図るので、エネルギーロスを低減できる。
（８）上記形態において、前記冷却装置は、前記第１部分を冷却する冷却用治具を有し、前記第１部分の少なくとも一部に前記冷却用治具を接触させることで前記第１部分を冷却してもよい。この形態によれば、冷却用治具を用いるので、冷却する部分を限定できる。
（９）上記形態において、前記冷却装置は、冷媒を噴射するノズルを有し、前記ノズルから噴射された冷媒を、前記第１部分の少なくとも一部に当てることで前記第１部分を冷却してもよい。この形態によれば、第１部分の形状によらず第１部分を冷却できる。
（１０）上記形態において、前記表面処理装置は、前記第２部分を覆う保持治具を有してもよい。この形態によれば、第２部分が表面処理工程により処理されることを抑制できる。
（１１）上記形態において、前記保持治具は、前記ワークの前記第１部分と前記第２部分の境界における断面の形状の穴を有し、前記穴の中に前記第２部分を嵌め込んでもよい。この形態によれば、前記第１部分以外が保持治具の穴の中にはめ込まれるので、簡易な構成で第２部分を保護できる。 (1) According to one embodiment of the present disclosure, a method for manufacturing a workpiece is provided, comprising : a hot forging step of hot forging a workpiece heated to a hot forging temperature in a hot forging device; a cooling step of moving the workpiece after the hot forging step and cooling only a portion of the workpiece including a first portion of the workpiece to be cold forged to a blasting temperature that is lower than the cold forging temperature; and a cooling step of terminating the cooling step after the portion of the workpiece including the first portion has been cooled to the blasting temperature, moving the workpiece to a surface treatment device, and performing blasting of the first portion at the blasting temperature. The method includes a surface treatment step of performing a blasting process on the surface , a heating step of moving the workpiece to a cold forging device while heating the first portion to a cold forging temperature using the residual heat from hot forging remaining in a second portion, which is a portion other than the one portion of the workpiece, after the surface treatment step, and a cold forging step of forging the first portion at the cold forging temperature in the cold forging device . According to this embodiment, the temperature of the first portion is raised using the heat from hot forging remaining in the second portion, thereby reducing energy loss.
(2) In the above aspect, in the cooling step, the first portion may be cooled by contacting a cooling jig with at least a part of the first portion. According to this aspect, since the cooling jig is used, the part to be cooled can be limited.
(3) In the above aspect, in the cooling step, the first portion may be cooled by applying a coolant sprayed from a nozzle to at least a part of the first portion. According to this aspect, the first portion can be cooled regardless of a shape of the first portion.
(4) In the above embodiment, the workpiece may be continuously transported from the hot forging device that performs the hot forging step to a surface treatment device that performs the surface treatment step, and the cooling step may be performed while the workpiece is being transported. According to this embodiment, the hot forging step to the surface treatment step are performed continuously as a series of steps, and the workpiece can be cooled.
(5) In the above-described embodiment, a holding jig that covers the second portion may be used in the surface treatment step. According to this embodiment, the second portion can be prevented from being treated in the surface treatment step.
(6) In the above embodiment, the holding jig may have a hole having a cross-sectional shape of 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 embodiment, the second portion is fitted into the hole of the holding jig, so that the second portion can be protected with a simple structure.
(7) According to one embodiment of the present disclosure, a workpiece manufacturing apparatus is provided, the workpiece manufacturing apparatus including: a conveying device for conveying a workpiece; a hot forging device for heating the workpiece to a hot forging temperature and then hot forging the workpiece; a cooling device for cooling only a portion of the workpiece including a first portion of the workpiece to be cold forged to a blasting temperature; a surface treatment device for terminating cooling by the cooling device after the portion of the workpiece including the first portion has been cooled to the blasting temperature and performing blasting on the surface of the first portion; and a cold forging device for forging the first portion; The hot forging device, the cooling device, the surface treatment device, and the cold forging device are sequentially arranged from the upstream side to the downstream side of the conveying device, the surface treatment device and the cold forging device are arranged at a predetermined interval, and a conveying device is provided for conveying the work from the surface treatment device to the cold forging device, and while the work is being moved to the cold forging device, the residual heat from the hot forging remaining in the second portion, which is a portion other than the one portion, is conducted to the first portion , and the temperature of the first portion is raised to the cold forging temperature. According to this embodiment, since the surface treatment device and the cold forging device are arranged at a predetermined interval, while the work is being conveyed from the surface treatment device to the cold forging device, the residual heat from the hot forging remaining in the second portion is conducted to the first portion, thereby reducing energy loss.
(8) In the above aspect, the cooling device may have a cooling jig that cools the first portion, and may cool the first portion by bringing the cooling jig into contact with at least a part of the first portion. According to this aspect, since the cooling jig is used, it is possible to limit the portion to be cooled.
(9) In the above aspect, the cooling device may have a nozzle that sprays a refrigerant, and the first portion may be cooled by applying the refrigerant sprayed from the nozzle to at least a part of the first portion. According to this aspect, the first portion can be cooled regardless of a shape of the first portion.
(10) In the above-described aspect, the surface treatment device may have a holding jig that covers the second portion. According to this aspect, it is possible to prevent the second portion from being treated in the surface treatment step.
(11) In the above embodiment, the holding jig may have a hole having a cross-sectional shape of a boundary between the first portion and the second portion of the work, and the second portion may be fitted into the hole. According to this embodiment, the part other than the first portion is fitted into the hole of the holding jig, so that the second portion can be protected with a simple structure.

本開示は、ワークの製造方法、製造装置以外の種々の形態で実現することも可能である。例えば、ワークの鍛造方法、鍛造装置等の形態で実現することができる。 The present disclosure can also be realized in various forms other than a workpiece manufacturing method and manufacturing device. For example, it can be realized in the form of a workpiece forging method, a forging device, etc.

ワークの製造装置を示す説明図である。FIG. 2 is an explanatory diagram showing a workpiece manufacturing device. ワークの一例を示す説明図である。FIG. 2 is an explanatory diagram showing an example of a workpiece. ワークの製造方法を示す説明図である。FIG. 4 is an explanatory diagram showing a method for manufacturing a workpiece. ワークの温度の遷移を示す説明図である。FIG. 4 is an explanatory diagram showing a transition of the temperature of a workpiece. ワークと冷却用治具を示す説明図である。FIG. 2 is an explanatory diagram showing a workpiece and a cooling jig. ワークとノズルを示す説明図である。FIG. 2 is an explanatory diagram showing a workpiece and a nozzle. ワークと保持治具を示す説明図である。FIG. 2 is an explanatory diagram showing a workpiece and a holding jig. ワークと保持治具を示す説明図である。FIG. 2 is an explanatory diagram showing a workpiece and a holding jig.

・第１実施形態：
図１は、ワーク１００の製造装置１０を示す説明図である。製造装置１０は、ワーク１００を上流から下流に搬送する搬送装置２０と、搬送装置２０の上流側から下流側に向けて順次配置された加熱装置３０と、熱間鍛造装置４０と、冷却装置５０と、表面処理装置６０と、冷間鍛造装置７０を備える。表面処理装置６０と、冷間鍛造装置７０とは、予め定めた間隔を空けて配置されており、その間には、ワーク１００に対して処理実行する装置が配置されていない。本実施形態では、搬送装置２０は、例えばコンベアであり、ワーク１００は、搬送装置２０に載せられて、加熱装置３０から冷間鍛造装置７０まで、連続して搬送される。搬送装置２０として、ロボットアームを用いてもよい。 First embodiment:
FIG. 1 is an explanatory diagram showing a manufacturing apparatus 10 for 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 arranged in sequence from the upstream side to the downstream side of the conveying device 20, a hot forging device 40, a cooling device 50, a surface treatment device 60, and a cold forging device 70. The surface treatment device 60 and the cold forging device 70 are arranged at a predetermined interval, and no device that performs processing on the workpiece 100 is arranged therebetween. In this embodiment, the conveying device 20 is, for example, a conveyor, and the workpiece 100 is placed on the conveying device 20 and conveyed continuously from the heating device 30 to the cold forging device 70. A robot arm may be used as the conveying device 20.

加熱装置３０は、ヒータを用いてワーク１００を、ワーク１００を構成する材料の変態点温度以上である熱間鍛造温度、例えば１０００～１３００℃までワーク１００を加熱する。 The heating device 30 uses a heater to heat the workpiece 100 to a hot forging temperature, for example 1000 to 1300°C, which is equal to or higher than the transformation point temperature of the material that constitutes the workpiece 100.

熱間鍛造装置４０は、加熱されたワーク１００に対して鍛造を行う熱間鍛造工程を実行する。 The hot forging device 40 performs a hot forging process to forge the heated workpiece 100.

冷却装置５０は、ワーク１００を、冷間鍛造温度よりも低温のブラスト加工温度まで冷却する冷却工程を実行する。ブラスト加工では、粉塵が生じるため、ブラスト加工温度は、例えば、１００℃未満の温度が好ましい。なお、冷間鍛造温度は、１００～１５０℃である。また、ブラスト加工時には、後述するように、投射材と呼ばれる粒体が衝突するため、ワーク１００の温度が上昇する。そのため、冷却装置は、ブラスト加工時に、ワーク１００の温度が１００℃を超えないような温度までワーク１００を冷却することが好ましい。 The cooling device 50 executes a cooling process to cool the workpiece 100 to a blasting temperature, which is lower than the cold forging temperature. Since blasting generates dust, the blasting temperature is preferably, for example, less than 100°C. The cold forging temperature is 100 to 150°C. During blasting, particles called blasting material collide with the workpiece 100, as described below, and the temperature of the workpiece 100 rises. Therefore, it is preferable that the cooling device cools the workpiece 100 to a temperature that does not exceed 100°C during blasting.

上述したように、熱間鍛造工程では、ワーク１００の温度が、１０００～１３００℃に加熱される。そのため、ワーク１００の表面に酸化皮膜（「スケール」とも呼ぶ。）が生じる。表面処理装置６０は、ワーク１００の表面に生じた酸化皮膜を、投射材と呼ばれる粒体をワーク１００に衝突させることで、除去する表面処理工程を実行する。ブラスト加工は、投射材として細かな鋼球を用いるショットブラスト加工、珪砂を用いるサンドブラスト加工、鋭角な形状をした鉄の粒を用いるグリッドブラスト加工などの総称であり、加工目的により適切な投射材が選択される。本実施形態では、ワーク１００の第１部分１００ａの表面に生じた酸化皮膜をショットブラスト加工により除去する。なお、本実施形態において、サンドブラスト加工や、グリッドブラスト加工を実行してもよい。 As described above, in the hot forging process, the temperature of the workpiece 100 is heated to 1000 to 1300°C. As a result, an oxide film (also called "scale") is formed on the surface of the workpiece 100. The surface treatment device 60 performs a surface treatment process in which the oxide film formed on the surface of the workpiece 100 is removed by colliding granules called blasting material with the workpiece 100. The blasting process is a general term for shot blasting using fine steel balls as blasting material, sand blasting using silica sand, and grid blasting using iron particles with acute angles, and an appropriate blasting material is selected depending on the processing purpose. In this embodiment, the oxide film formed on the surface of the first portion 100a of the workpiece 100 is removed by shot blasting. Note that in this embodiment, sand blasting and grid blasting may also be performed.

冷間鍛造装置７０は、ワーク１００に対して１００～１５０℃の温度で鍛造を行う冷間鍛造工程を実行する。 The cold forging device 70 performs a cold forging process on the workpiece 100 at a temperature of 100 to 150°C.

図２は、ワーク１００の一例を示す説明図である。ワーク１００は金属で形成されており、第１部分１００ａと第２部分１００ｂとを備える。第１部分１００ａには、ブラスト加工及び冷間鍛造が行われる部分であり、第２部分１００ｂは、ブラスト加工及び冷間鍛造が行われない部分である。 Figure 2 is an explanatory diagram showing an example of the workpiece 100. The workpiece 100 is made of metal and has a first portion 100a and a second portion 100b. The first portion 100a is a portion where blast processing and cold forging are performed, and the second portion 100b is a portion where blast processing and cold forging are not performed.

図３は、ワーク１００の製造方法を示す説明図である。図４は、ワーク１００の温度の遷移を示す説明図である。時刻ｔ０からｔ１までのステップＳ１０では、加熱装置３０は、ベルココンベア２０上を移動するワーク１００の全体を加熱する。そのため、ワーク１００の全体の温度が上昇していく。ワーク１００の温度が１０００～１３００℃になると、ベルココンベア２０上のワーク１００は、加熱装置３０を出て熱間鍛造装置４０に入り、処理はステップＳ２０に移行する。 Figure 3 is an explanatory diagram showing the manufacturing method of the workpiece 100. Figure 4 is an explanatory diagram showing the transition of the 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 Velco conveyor 20. As a result, the temperature of the entire workpiece 100 rises. When the temperature of the workpiece 100 reaches 1000 to 1300°C, the workpiece 100 on the Velco conveyor 20 leaves the heating device 30 and enters the hot forging device 40, and the process proceeds to step S20.

時刻ｔ１からｔ２のステップＳ２０では、熱間鍛造装置４０は、ワーク１００に対して熱間鍛造を実行する熱間鍛造工程を実行する。熱間鍛造工程では、ワーク１００は、鍛造により衝突エネルギーを受けるが、ワーク１００の温度が高いため、両者のバランスにより、ワーク１００の温度は、少しずつ低下していく。熱間鍛造工程が終了すると、ベルココンベア２０上のワーク１００は、熱間鍛造装置４０を出て、冷却装置５０に入り、処理はステップＳ３０に移行する。 In step S20 from time t1 to t2, the hot forging device 40 executes a hot forging process to perform hot forging on the workpiece 100. In the hot forging process, the workpiece 100 receives collision energy from forging, but because the temperature of the workpiece 100 is high, the temperature of the workpiece 100 gradually decreases due to the balance between the two. When the hot forging process is completed, the workpiece 100 on the VELCO conveyor 20 leaves the hot forging device 40 and enters the cooling device 50, and the process proceeds to step S30.

ワーク１００の第１部分１００ａと第２部分１００ｂの温度遷移は同じではないので、第１部分１００ａと第２部分１００ｂの温度遷移を分けて説明する。 The temperature transitions of the first part 100a and the second part 100b of the workpiece 100 are not the same, so the temperature transitions of the first part 100a and the second part 100b will be explained separately.

先ず、第１部分１００ａについて説明する。ステップＳ２０の熱間鍛造工程の後の時刻ｔ２からｔ３のステップＳ３０では、冷却装置５０は、ワーク１００の第１部分１００ａの少なくとも一部を含むワーク１００の一部分を、強制的に冷却する冷却工程を実行する。「ワーク１００の第１部分１００ａの少なくとも一部を含むワーク１００の一部分」とは、冷間鍛造される第１部分１００ａの少なくとも一部であってもよいし、冷間鍛造される第１部分１００ａより予め定めた範囲だけ大きな部分であってもよい。図５は、ワーク１００と冷却用治具５２を示す説明図である。冷却用治具５２は、冷間鍛造温度よりも低い温度に冷却されている。冷却装置５０は、ワーク１００の第１部分１００ａの内側と外側から第１部分１００ａに、冷却用治具５２を接触させてワーク１００の第１部分を冷却する。冷却用治具５２は、第２部分１００ｂに接触しないため、第２部分１００ｂを冷却せずに第１部分１００ａを冷却できる。時刻ｔ３において、ワーク１００の第１部分１００ａの温度が１００℃未満となり、ブラスト加工に適した温度になると、ベルココンベア２０上のワーク１００は、冷却用治具５２が外された後冷却装置５０を出て、表面処理装置６０に入り、処理はステップＳ４０に移行する。なお、冷却用治具５２は、第１部分１００ａの全表面に接触している必要はなく、第１部分１００ａ全体の温度がブラスト加工温度に低下するように、第１部分１００ａに接触していればよい。また、冷却用治具５２は、第２部分１００ｂに少し接触していてもよい。 First, the first portion 100a will be described. In step S30 from time t2 to t3 after the hot forging process of step S20, the cooling device 50 executes a cooling process to forcibly cool a portion of the workpiece 100 including at least a portion of the first portion 100a of the workpiece 100. The "portion of the workpiece 100 including at least a portion of the first portion 100a of the workpiece 100" may be at least a portion of the first portion 100a to be cold forged, or may be a portion 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 cools the first portion of the workpiece 100 by contacting the cooling jig 52 with the first portion 100a of the workpiece 100 from the inside and outside of the first portion 100a. Since the cooling jig 52 does not contact the second portion 100b, the first portion 100a can be cooled without cooling the second portion 100b. At time t3, when the temperature of the first portion 100a of the workpiece 100 becomes less than 100°C and becomes a temperature suitable for blast processing, the workpiece 100 on the Belco conveyor 20 leaves the cooling device 50 after the cooling jig 52 is removed and enters the surface processing device 60, and the process proceeds to step S40. Note that the cooling jig 52 does not need to be in contact with the entire surface of the first portion 100a, and it is sufficient that the cooling jig 52 is in contact with the first portion 100a so that the temperature of the entire first portion 100a is reduced to the blast processing temperature. The cooling jig 52 may also be in slight contact with the second portion 100b.

ステップＳ３０の冷却工程の後の時刻ｔ３からｔ４のステップＳ４０では、表面処理装置６０は、ワーク１００の第１部分１００ａの表面に生じた酸化被膜をショットブラスト加工により除去する表面処理工程を実行する。酸化被膜が除去されると、搬送装置２０上のワーク１００は、表面処理装置６０を出て、処理はステップＳ５０に移行する。なお、ブラスト加工時には、冷却用治具５２が外されるので、ワーク１００の第１部分１００ａの温度は、第２部分１００ｂからの熱伝導により、少し上昇する。 In step S40, from time t3 to t4 after the cooling process in step S30, the surface treatment device 60 performs a surface treatment process to remove the oxide film formed on the surface of the first portion 100a of the workpiece 100 by shot blasting. Once the oxide film has been removed, the workpiece 100 on the transport device 20 leaves the surface treatment device 60, and the process proceeds to step S50. Note that since the cooling jig 52 is removed during the blasting process, the temperature of the first portion 100a of the workpiece 100 rises slightly due to heat conduction from the second portion 100b.

ステップＳ４０の表面処理工程の後の時刻ｔ４からｔ５のステップＳ５０では、搬送装置２０上のワーク１００は、冷間鍛造装置７０に向けて移動する。この間、第２部分１００ｂに残存する熱が第１部分１００ａに熱伝導するため、ワーク１００の第１部分１００ａの温度は上昇する。すなわち、ステップＳ５０は、第２部分１００ｂに残る熱間鍛造温度の残存熱を用いて第１部分１００ａの温度を冷間鍛造温度まで昇温させる昇温工程である。第２部分１００ｂに残存する熱を用いて冷間鍛造温度まで昇温させる際、第２部分１００ｂに残存する熱のみに拠って昇温させても良いし、補助的にヒータなどによる加熱を行なって昇温させても良い。補助的な加熱は、残存熱の総量が第２部分の昇温に足りない場合のみならず、第２部分の昇温に足りている場合であっても、例えば昇温時間の短縮のために行なってもよい。表面処理装置６０と冷間鍛造装置７０の間に、補助的にヒータなどを設けてもよい。 In step S50 from time t4 to t5 after the surface treatment process of step S40, the workpiece 100 on the conveying device 20 moves toward the cold forging device 70. During this time, the heat remaining in the second portion 100b is thermally conducted to the first portion 100a, so that the temperature of the first portion 100a of the workpiece 100 rises. That is, step S50 is a heating process in which the temperature of the first portion 100a is raised to the cold forging temperature using the residual heat of the hot forging temperature remaining in the second portion 100b. When raising the temperature to the cold forging temperature using the heat remaining in the second portion 100b, the temperature may be raised only by the heat remaining in the second portion 100b, or the temperature may be raised by auxiliary heating using a heater or the like. Auxiliary heating may be performed not only when the total amount of residual heat is insufficient to raise the temperature of the second portion, but also when the total amount of residual heat is sufficient to raise the temperature of the second portion, for example, to shorten the temperature rise time. A heater or other auxiliary device may be provided between the surface treatment device 60 and the cold forging device 70.

次に、第２部分１００ｂについて説明する。時刻ｔ２からｔ５のステップＳ６０
では、ワーク１００の第２部分１００ｂは、自然放冷される。「第２部分１００ｂの自然放冷」とは、第２部分１００ｂを強制的に冷却しないことを意味する。なお、上述したように、ワーク１００の第１部分１００ａと第２部分１００ｂとは繋がっている。そのため、第１部分１００ａが冷却装置５０の冷却用治具５２により冷却されると、第１部分１００ａの温度が第２部分１００ｂの温度よりも低下する。そのため、第１部分１００ａの温度が第２部分１００ｂの温度よりも低い間は、第２部分１００ｂは、自然放冷と、第１部分１００ａへの熱伝導により、温度が低下する。但し、第２部分１００ｂは、第１部分１００ａよりも低温にはならない。 Next, the second portion 100b will be described. Step S60 from time t2 to t5
In the above, the second portion 100b of the workpiece 100 is naturally cooled. "Natural cooling of the second portion 100b" means that the second portion 100b is not forcibly cooled. As described above, the first portion 100a and the second portion 100b of the workpiece 100 are connected. 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 the temperature of the second portion 100b. Therefore, while the temperature of the first portion 100a is lower than the temperature of the second portion 100b, the temperature of the second portion 100b is lowered by natural cooling and heat conduction to the first portion 100a. However, the second portion 100b does not become lower in temperature than the first portion 100a.

時刻ｔ５になると、第１部分１００ａの温度は、冷間鍛造に適した冷間鍛造温度まで上昇する。ワーク１００は、冷間鍛造装置７０に入り、処理はステップＳ７０に移行する。第１部分１００ａの温度が、第２部分１００ｂの温度よりも低くてもよく、図４に示すように、第１部分１００ａの温度と第２部分１００ｂの温度は、ほぼ同じ温度になっていてもよい。 At time t5, the temperature of the first portion 100a rises to a cold forging temperature suitable for cold forging. The workpiece 100 enters the cold forging device 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 approximately the same.

ステップＳ５０の昇温工程の後の時刻ｔ５からｔ６のステップＳ７０では、冷間鍛造装置７０は、ワークの第１部分１００ａに体して鍛造を行う冷間鍛造工程を実行する。なお、図４では、冷間鍛造工程の間、ワーク１００の温度がほぼ変わらないグラフとなっているが、ワーク１００から大気への放熱と、鍛造により受ける衝突エネルギーと、のバランスにより、ワーク１００の温度は変化する。冷間鍛造工程が終了すると、ワーク１００は、冷間鍛造装置７０を出て、処理は、ステップＳ８０に移行する。 In step S70, from time t5 to t6 after the temperature increase step in step S50, the cold forging device 70 executes a cold forging step in which forging is performed on the first portion 100a of the workpiece. Note that in FIG. 4, the graph shows that the temperature of the workpiece 100 remains almost constant during the cold forging step, but the temperature of the workpiece 100 changes depending on the balance between the heat dissipated from the workpiece 100 to the atmosphere and the collision energy received during forging. When the cold forging step is completed, the workpiece 100 leaves the cold forging device 70, and the process proceeds to step S80.

時刻ｔ６からｔ７のステップＳ８０では、ワーク１００は、自然放冷される。 In step S80, from time t6 to t7, the workpiece 100 is allowed to cool naturally.

以上、第１実施形態によれば、表面処理装置６０と冷間鍛造装置７０とは、予め定めた間隔を空けて配置されている。そのため、搬送装置２０上のワーク１００が、表面処理装置６０を出て冷間鍛造装置７０に入るまでのステップＳ７０の期間、第２部分１００ｂに残る熱間鍛造温度の残存熱を用いて第１部分１００ａの温度を冷間鍛造温度まで昇温させる昇温工程が実行される。そのため、ヒータを用いて第１部分１００ａを再加熱する必要が無く、エネルギーロスが生じない。なお、表面処理装置６０と冷間鍛造装置７０との間は、上述したように、予め定められた間隔を空けて配置されているが、この予め定められた間隔は、ワーク１００の第２部分１００ｂの熱が、第１部分１００ａに伝導して、第１部分１００ａの温度を冷間鍛造温度まで上昇させるのに必要な間隔であればよい。また、本実施形態によれば、第２部分１００ｂの温度は、ブラスト加工温度まで低下しないので、第１部分１００ａを再加熱する場合であっても、第２部分１００ｂの温度をブラスト加工温度まで低下させる場合に比べて、第１部分１００ａを再加熱するより再加熱のエネルギーを少なくできる。 As described above, according to the first embodiment, the surface treatment device 60 and the cold forging device 70 are arranged at a predetermined interval. Therefore, during the period of step S70 until the work 100 on the conveying device 20 leaves the surface treatment device 60 and enters the cold forging device 70, a heating process is performed in which the temperature of the first part 100a is raised to the cold forging temperature using the residual heat of the hot forging temperature remaining in the second part 100b. Therefore, there is no need to reheat the first part 100a using a heater, and no energy loss occurs. Note that, as described above, the surface treatment device 60 and the cold forging device 70 are arranged at a predetermined interval, but this predetermined interval may be an interval necessary for the heat of the second part 100b of the work 100 to be conducted to the first part 100a and the temperature of the first part 100a to be raised to the cold forging temperature. Furthermore, according to this embodiment, the temperature of the second portion 100b does not drop to the blast processing temperature, so even when the first portion 100a is reheated, less energy is required to reheat the first portion 100a than when the temperature of the second portion 100b is lowered to the blast processing temperature.

・第２実施形態：
図６は、ワーク１００とノズル５４を示す説明図である。第１実施形態では、冷却装置５０は、冷却用治具５２をワーク１００の第１部分１００ａに接触させることで、第１部分１００ａを冷却しているが、第２実施形態では、ノズル５４から第１部分１００ａに冷媒５５を噴射することで、第１部分１００ａを冷却する。冷媒５５としては、窒素や、炭酸ガスを利用可能である。低温の冷媒５５を準備して第１部分１００ａに当ててもよく、高圧の冷媒５５をノズル５４から噴射させることで、断熱膨張させ、冷媒５５の温度を下げて、第１部分１００ａに当ててもよい。 Second embodiment:
6 is an explanatory diagram showing the workpiece 100 and the nozzle 54. In the first embodiment, the cooling device 50 cools the first portion 100a of the workpiece 100 by bringing the cooling jig 52 into contact with the first portion 100a, but in the second embodiment, the cooling device 50 cools the first portion 100a by spraying the refrigerant 55 from the nozzle 54 to the first portion 100a. Nitrogen or carbon dioxide gas can be used as the refrigerant 55. A low-temperature refrigerant 55 may be prepared and applied to the first portion 100a, or a high-pressure refrigerant 55 may be sprayed from the nozzle 54 to adiabatically expand the refrigerant 55, lowering the temperature of the refrigerant 55, and then applied to the first portion 100a.

第２実施形態によれば、ノズル５４から噴射された冷媒５５を用いて第１部分１００ａを冷却するので、第１部分１００ａの形状が複雑でも、第１部分１００ａを冷却できる。 According to the second embodiment, the first portion 100a is cooled using the refrigerant 55 sprayed from the nozzle 54, so that the first portion 100a can be cooled even if the shape of the first portion 100a is complex.

図７、図８は、ワーク１００と保持治具６２を示す説明図である。図７は、ワーク１００と保持治具６２を、その中心軸Ｏを通る平面で切った断面を示し、図８は、中心軸Ｏと垂直な平面で切った断面を示している。本実施形態で用いられる保持治具６２は、一方に開口部６２ｂを有する円筒形の円筒部６２ａと、円筒部６２ａの開口部６２ｂと反対側に設けられた底面６２ｃと、底面６２ｃに形成された穴６２ｄとを備える。穴６２ｄは、ワーク１００の第１部分１００ａと第２部分１００ｂの境界における中心軸Ｏと垂直な断面の形状に対応しており、保持治具６２は、ワーク１００の第１部分１００ａを保持治具６２の外側に露出し、第２部分１００ｂを保持治具６２の内部に嵌め込んだ状態でワークを格納できる。 7 and 8 are explanatory diagrams showing the work 100 and the holding jig 62. FIG. 7 shows a cross section of the work 100 and the holding jig 62 cut on a plane passing through the central axis O, and FIG. 8 shows a cross section cut on a plane perpendicular to the central axis O. The holding jig 62 used in this embodiment has a cylindrical portion 62a having an opening 62b on one side, a bottom surface 62c provided on the opposite side of the opening 62b of the cylindrical portion 62a, and a hole 62d formed in the bottom surface 62c. The hole 62d corresponds to the shape of a cross section perpendicular to the central axis O at the boundary between the first part 100a and the second part 100b of the work 100, and the holding jig 62 can store the work with the first part 100a of the work 100 exposed to the outside of the holding jig 62 and the second part 100b fitted inside the holding jig 62.

保持治具６２は、ワーク１００の第２部分１００ｂを覆っているので、ブラスト加工時に、投射材と呼ばれる粒体は、ワーク１００のうち、第１部分１００ａには当たるが第２部分１００ｂには、当たらないので、第１部分１００ａのみの酸化皮膜を除去できる。すなわち、第２部分１００ｂが、ブラスト加工されることを保持治具６２により抑制できる。 The holding jig 62 covers the second portion 100b of the workpiece 100, so that during blast processing, granules called projection material hit the first portion 100a of the workpiece 100 but not the second portion 100b, and the oxide film can be removed only from the first portion 100a. In other words, the holding jig 62 can prevent the second portion 100b from being blast processed.

保持治具６２は、冷却装置５０においても使用可能である。例えば、ノズル５４から噴射された冷媒５５を用いて第１部分１００ａを冷却する場合、保持治具６２により、第２部分１００ｂは、冷媒５５が当たらない、そのため、第２部分１００ｂに熱間鍛造工程における熱を保持でき、ステップＳ５０の昇温工程で、第２部分１００ｂの熱を第１部分１００ａに伝導させる第１部分１００ａを昇温できる。 The holding jig 62 can also be used in the cooling device 50. For example, when the first portion 100a is cooled using the coolant 55 sprayed from the nozzle 54, the holding jig 62 prevents the coolant 55 from hitting the second portion 100b, so that the heat from the hot forging process can be retained in the second portion 100b, and the first portion 100a can be heated in the heating process of step S50, which transfers the heat of the second portion 100b to the first portion 100a.

本開示は、上述の実施形態に限られるものではなく、その趣旨を逸脱しない範囲において種々の構成で実現することができる。例えば、発明の概要の欄に記載した各形態中の技術的特徴に対応する実施形態の技術的特徴は、上述の課題の一部又は全部を解決するために、あるいは、上述の効果の一部又は全部を達成するために、適宜、差し替えや、組み合わせを行うことが可能である。また、その技術的特徴が本明細書中に必須なものとして説明されていなければ、適宜、削除することが可能である。 The present disclosure is not limited to the above-described embodiments, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features of the embodiments corresponding to the technical features in each form described in the Summary of the Invention column can be replaced or combined as appropriate to solve some or all of the above-described problems or to achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be deleted as appropriate.

１０…製造装置、２０…搬送装置、３０…加熱装置、４０…熱間鍛造装置、５０…冷却装置、５２…冷却用治具、５４…ノズル、５５…冷媒、６０…表面処理装置、６２…保持治具、６２ａ…円筒部、６２ｂ…開口部、６２ｃ…底面、６２ｄ…穴、７０…冷間鍛造装置、１００…ワーク、１００ａ…第１部分、１００ｂ…第２部分、Ｏ…中心軸、ｔ０～ｔ６…時刻 10... manufacturing device, 20... conveying device, 30... heating device, 40... hot forging device, 50... cooling device, 52... cooling jig, 54... nozzle, 55... refrigerant, 60... surface treatment device, 62... holding jig, 62a... cylindrical portion, 62b... opening, 62c... bottom surface, 62d... hole, 70... cold forging device, 100... workpiece, 100a... first part, 100b... second part, O... center axis, t0 to t6... time

Claims (11)

ワークの製造方法であって、
熱間鍛造温度まで昇温したワークを、熱間鍛造装置において、熱間鍛造する熱間鍛造工程と、
前記熱間鍛造工程の後、前記ワークを移動し、前記ワークのうちの冷間鍛造を行う第１部分を含む前記ワークの一部分のみを冷間鍛造温度よりも低温のブラスト加工温度に冷却する冷却工程と、
前記第１部分を含む前記ワークの一部分が前記ブラスト加工温度に冷却された後、前記冷却工程を終了し、前記ワークを表面処理装置に移動し、前記ブラスト加工温度で、前記第１部分の表面に対してブラスト加工を行う表面処理工程と、
前記表面処理工程の後、前記ワークの前記一部分以外の部分である第２部分に残る熱間鍛造の時の残存熱を用いて前記第１部分の温度を冷間鍛造温度まで昇温させつつ、前記ワークを冷間鍛造装置に移動する昇温工程と、
前記冷間鍛造装置において、前記冷間鍛造温度で前記第１部分の鍛造を行う冷間鍛造工程と、
を備える、ワークの製造方法。 A method for manufacturing a workpiece, comprising:
A hot forging process in which the workpiece heated to the hot forging temperature is hot forged in a hot forging device;
a cooling step of moving the workpiece after the hot forging step and cooling only a portion of the workpiece including a first portion of the workpiece to be cold forged to a blast processing temperature that is lower than the cold forging temperature;
a surface treatment step of terminating the cooling step after a portion of the workpiece including the first portion has been cooled to the blast processing temperature, moving the workpiece to a surface treatment device, and performing blast processing on a surface of the first portion at the blast processing temperature;
A heating process in which the temperature of the first portion is raised to a cold forging temperature using residual heat from the hot forging remaining in a second portion other than the portion of the workpiece after the surface treatment process, and the workpiece is moved to a cold forging device .
a cold forging step of forging the first portion at the cold forging temperature in the cold forging device ;
A method for manufacturing a workpiece, comprising: 請求項１に記載のワークの製造方法であって、
前記冷却工程では、前記第１部分の少なくとも一部に冷却用治具を接触させることで前記第１部分を冷却する、ワークの製造方法。 The method for manufacturing a workpiece according to claim 1,
A method for manufacturing a workpiece, wherein in the cooling step, the first portion is cooled by contacting a cooling jig with at least a portion of the first portion. 請求項１に記載のワークの製造方法であって、
前記冷却工程では、ノズルから噴射された冷媒を、前記第１部分の少なくとも一部に当てることで前記第１部分を冷却する、ワークの製造方法。 A method for manufacturing a workpiece according to claim 1,
A method for manufacturing a workpiece, wherein the cooling step cools the first portion by applying a coolant sprayed from a nozzle to at least a portion of the first portion. 請求項１から請求項３のいずれか一項に記載のワークの製造方法であって、
前記熱間鍛造工程を行う前記熱間鍛造装置から前記表面処理工程を行う前記表面処理装置までの間、前記ワークが連続して搬送され、前記ワークが搬送される間に前記冷却工程が実行される、ワークの製造方法。 A method for manufacturing a workpiece according to any one of claims 1 to 3,
A method for manufacturing a workpiece, in which the workpiece is continuously transported from the hot forging device that performs the hot forging step to the surface treatment device that performs the surface treatment step, and the cooling step is performed while the workpiece is being transported. 請求項１から請求項４のいずれか一項に記載のワークの製造方法であって、
前記表面処理工程では、前記第２部分を覆う保持治具を用いる、ワークの製造方法。 A method for manufacturing a workpiece according to any one of claims 1 to 4,
A method for manufacturing a workpiece, in which a holding jig that covers the second portion is used in the surface treatment process. 請求項５に記載のワークの製造方法であって、
前記保持治具は、前記ワークの前記第１部分と前記第２部分の境界における断面の形状の穴を有し、前記穴の中に前記第２部分を嵌め込む、ワークの製造方法。 The method for manufacturing a workpiece according to claim 5,
A method for manufacturing a workpiece, wherein the holding jig has a hole having a cross-sectional shape at the boundary between the first and second parts of the workpiece, and the second part is fitted into the hole. ワークの製造装置であって、
ワークを搬送する搬送装置と、
前記ワークを熱間鍛造温度まで昇温した後、熱間鍛造を行う熱間鍛造装置と、
前記ワークのうちの冷間鍛造を行う第１部分を含む前記ワークの一部分のみをブラスト加工温度に冷却する冷却装置と、
前記第１部分を含む前記ワークの一部分が前記ブラスト加工温度に冷却されたのち、前記冷却装置による冷却を終了し、前記第１部分の表面に対してブラスト加工を実行する表面処理装置と、
前記第１部分の鍛造を行うと冷間鍛造装置と、
を備え、
前記熱間鍛造装置と、前記冷却装置と、前記表面処理装置と、前記冷間鍛造装置とは、前記搬送装置の上流側から下流側に向けて順次配置され、
前記表面処理装置と前記冷間鍛造装置とは予め定めた間隔を空けて配置され、
前記ワークを前記表面処理装置から前記冷間鍛造装置に搬送する搬送装置を設け、前記ワークを前記冷間鍛造装置に移動する間に、前記一部分以外の部分である第２部分に残る熱間鍛造の時の残存熱の前記第１部分への伝導を図り、前記第１部分の温度を冷間鍛造温度まで昇温する、
ワークの製造装置。 A workpiece manufacturing apparatus,
A conveying device that conveys the workpiece;
A hot forging device that heats the workpiece to a hot forging temperature and then performs hot forging;
A cooling device that cools only a portion of the workpiece, including a first portion to be cold forged, to a blasting temperature;
a surface treatment device that, after a portion of the workpiece including the first portion is cooled to the blast processing temperature, stops cooling by the cooling device and performs blast processing on a surface of the first portion;
a cold forging device for forging the first portion;
Equipped with
The hot forging device, the cooling device, the surface treatment device, and the cold forging device are sequentially arranged from the upstream side to the downstream side of the conveying device,
The surface treatment device and the cold forging device are disposed at a predetermined interval,
A conveying device is provided for conveying the workpiece from the surface treatment device to the cold forging device, and while the workpiece is being moved to the cold forging device , the residual heat remaining in the second portion other than the one portion during the hot forging is conducted to the first portion , and the temperature of the first portion is raised to the cold forging temperature.
Workpiece manufacturing equipment. 請求項７に記載のワークの製造装置であって、
前記冷却装置は、前記第１部分を冷却する冷却用治具を有し、前記第１部分の少なくとも一部に前記冷却用治具を接触させることで前記第１部分を冷却する、ワークの製造装置。 The workpiece manufacturing apparatus according to claim 7,
The cooling device is a workpiece manufacturing apparatus having a cooling jig that cools the first portion, and cools the first portion by contacting the cooling jig with at least a portion of the first portion. 請求項７に記載のワークの製造装置であって、
前記冷却装置は、冷媒を噴射するノズルを有し、前記ノズルから噴射された冷媒を、前記第１部分の少なくとも一部に当てることで前記第１部分を冷却する、ワークの製造装置。 The workpiece manufacturing apparatus according to claim 7,
The cooling device is a workpiece manufacturing apparatus having a nozzle for spraying a coolant, and cools the first portion by directing the coolant sprayed from the nozzle against at least a portion of the first portion. 請求項７から請求項９のいずれか一項に記載のワークの製造装置であって、
前記表面処理装置は、前記第２部分を覆う保持治具を有する、ワークの製造装置。 The workpiece manufacturing apparatus according to any one of claims 7 to 9,
The surface treatment device is a workpiece manufacturing device having a holding jig that covers the second portion. 請求項１０に記載のワークの製造装置であって、
前記保持治具は、前記ワークの前記第１部分と前記第２部分の境界における断面の形状の穴を有し、前記穴の中に前記第２部分を嵌め込む、ワークの製造装置。 The workpiece manufacturing apparatus according to claim 10,
A workpiece manufacturing device, wherein the holding jig has a hole having a cross-sectional shape at the boundary between the first part and the second part of the workpiece, and the second part is fitted into the hole.
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