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WO2018033195A1 - Method for manufactering sleeve - Google Patents

Method for manufactering sleeve Download PDF

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Publication number
WO2018033195A1
WO2018033195A1 PCT/EP2016/069331 EP2016069331W WO2018033195A1 WO 2018033195 A1 WO2018033195 A1 WO 2018033195A1 EP 2016069331 W EP2016069331 W EP 2016069331W WO 2018033195 A1 WO2018033195 A1 WO 2018033195A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
sleeve
billet
shaped
shaped portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2016/069331
Other languages
French (fr)
Inventor
Shanguo FANG
Markus WAGENBRET
Hongjun CHANG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to PCT/EP2016/069331 priority Critical patent/WO2018033195A1/en
Publication of WO2018033195A1 publication Critical patent/WO2018033195A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/10—Making other particular articles parts of bearings; sleeves; valve seats or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/02—Making hollow objects characterised by the structure of the objects
    • B21D51/10—Making hollow objects characterised by the structure of the objects conically or cylindrically shaped objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/84—Making other particular articles other parts for engines, e.g. connecting-rods

Definitions

  • the present disclosure relates to a method for manufacturing a sleeve for coolant flowing through, more particularly to a method for manufacturing a sleeve through hot bending processes.
  • Electric-drive component is one of the key power components in an electric vehicle or a hybrid electric vehicle.
  • the electric vehicle which has a working principle different from the internal combustion engine, is easy to malfunction under high temperature. Therefore, an electric-drive component which takes an electromotor as a power source is required to be provided with a cooling system for dissipating heat of the electromotor.
  • liquid cooling system is one of the most frequently used cooling systems. Specifically, through setting a sleeve at an external portion of the electromotor, cooling liquid can flow through the sleeve to dissipate heat of the electromotor when needed. As such, temperature of the electric-drive component can be lowered, which ensures that the electromotor can work under an appropriate temperature range.
  • a plurality of ear-shaped portions are needed for bolting at one end of the sleeve along an axial direction, where the sleeve is set at the external portion of the electromotor.
  • a circular-ring-shaped billet having a relative large wall thickness is required in order to form the ear-shaped portion at one end of the sleeve.
  • the wall thickness of the circular-ring-shaped billet is larger than a radial dimension of the ear-shaped portion being formed.
  • the present disclosure provides a method to solve problems of high complexity, high material cost and high process cost for manufacturing a sleeve of an electric vehicle for coolant flowing through.
  • the present disclosure provides a method for manufacturing a sleeve for coolant flowing through, wherein the sleeve is used in an electromotor and has an ear-shaped portion for fixing at one or more ends of the sleeve along an axial direction.
  • the method includes following steps: performing a cold bending treatment on at least one end of a circular-ring-shaped billet, to form a tapered ring which slants outwardly with a slant angle greater than 30°; heating the circular-ring-shaped billet to a yield temperature; performing a hot bending treatment on the tapered ring, to form a ring-shaped portion which slants outwardly with a slant angle of 90°; performing a heat treatment on the ring-shaped portion, to relieve stress; and performing a machining on the ring-shaped portion, to form the ear-shaped portion for fixing.
  • the cold bending treatment is performed for one or more times.
  • the hot bending treatment is performed for one or more times.
  • the tapered ring formed through the cold bending treatment has an outward slant angle of 45°.
  • the yield temperature ranges from 600°C to 1200°C.
  • the heat treatment is performed on a bended portion of the circular-ring-shaped billet.
  • the present disclosure possesses following advantages.
  • a circular-ring-shaped billet with a thin wall thickness is used, which reduces the material cost.
  • the processing procedure is only performed on an end portion of the billet, instead of the entire billet, which avoids to process the billet with a large area. Therefore, the manufacturing cost is also lowered. Moreover, accuracy requirement for the processing procedure is reduced, which further lowers the manufacturing cost.
  • FIG. 1 a and FIG. 1 b illustrate a manufacturing process of a sleeve in an electromotor according to an existing technology
  • FIG. 2a to FIG. 2d illustrate intermediate structures of manufacturing process of a sleeve in 5 an electromotor according to a first embodiment of the present disclosure.
  • a wall thickness of a circular-ring-shaped billet 20 is only 10 required to be substantially equal to a wall thickness of a final product.
  • a cold bending treatment is performed on one end of the circular-ring- shaped billet 20 where an ear-shaped portion is needed to be formed, thus a portion of the circular-ring-shaped billet 20 slants outwardly.
  • a tapered ring 21 having a slant angle about 45° is formed.
  • the portion of the circular-ring-shaped billet 20 slanting outwardly 15 has a width corresponds to a size of the ear-shaped portion to be formed.
  • the circular-ring-shaped billet 20 which is processed with the cold bending treatment is heated to a yield temperature (e.g., 800°C). Thereafter, a hot bending treatment is performed, so as to make the portion of the tapered ring further slants outwardly to a position perpendicular to other portions of the circular-ring shaped billet. With this, an annular portion 20 22 having a slant angle of 90° is formed, as shown in FIG. 2c.
  • heat may be implemented to a portion of the circular-ring-shaped billet 20 (e.g., the portion which needs to be bended outwardly), or be implemented to the entire circular-ring-shaped billet 20.
  • the portion being bended outwardly is processed with a heat treatment, so as to relive stress 25 generated in the hot bending treatment. Thereafter, the ear-shaped portion 23 is formed on the annular portion 22, as shown in FIG. 2d.
  • the yield temperature of 800°C is just for an exemplary illustration.
  • the yield temperature relates to material of the circular-ring-shaped billet and material of a processing mould. Normally, the yield temperature ranges from 600°C to 1200°C. If the yield 30 temperature is too low, the hot bending treatment can not be achieved, and if the yield temperature is too high, performance of the module will be affected.
  • the present disclosure also provides another embodiment, wherein the circular-ring-shaped billet may be the same with the above recited embodiment.
  • One end of the circular-ring-shaped billet, where an ear-shaped portion needs to be formed, is processed with a first cold bending treatment, thus a portion of the circular-ring-shaped billet slants outwardly to form a first tapered ring having a slant angle about 30°.
  • the portion of the circular-ring-shaped billet slanting outwardly has a width corresponds to a size of the ear- shaped portion to be formed.
  • the first tapered ring is further processed with a second cold bending treatment, so as to form a second tapered ring having a slant angle about 60°.
  • the circular-ring-shaped which is processed with the cold bending treatment for twice, is heated to a yield temperature (e.g., 800°C). Thereafter, a hot bending treatment is performed, so as to make the second tapered ring further slant outwardly to a position perpendicular to other portions of the circular-ring shaped billet. In such a way, an annular portion having a slant angle of 90° is formed.
  • the portion being bended outwardly is processed with a heat treatment, so as to relive stress generated in the hot bending treatment. Thereafter, the ear-shaped portion being needed is formed on the annular portion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

A method for manufacturing a sleeve for coolant flowing through, wherein the sleeve is used in an electromotor and has an ear-shaped portion for fixing at one or more ends of the sleeve along an axial direction, comprises following steps: performing a cold bending treatment on at least one end of a circular-ring-shaped billet, to form a tapered ring that slants outwardly with a slant angle greater than 30°; heating the circular-ring-shaped billet to a yield temperature; performing a hot bending treatment on the tapered ring, to form a ring-shaped portion that slants outwardly with a slant angle of 90°; performing a heat treatment on the ring-shaped portion, to relieve stress; and performing a machining on the ring-shaped portion, to form the ear-shaped portion for fixing. Accordingly, the processing procedure is only performed on an end portion of the billet, instead of the entire billet, which avoids to process the billet with a large area. Therefore, the manufacturing cost is also lowered. Moreover, accuracy requirement for the processing procedure is reduced, which further lowers the manufacturing cost.

Description

Method for manufactering sleeve
TECHNICAL FIELD The present disclosure relates to a method for manufacturing a sleeve for coolant flowing through, more particularly to a method for manufacturing a sleeve through hot bending processes.
BACKGROUND
Electric-drive component is one of the key power components in an electric vehicle or a hybrid electric vehicle. The electric vehicle, which has a working principle different from the internal combustion engine, is easy to malfunction under high temperature. Therefore, an electric-drive component which takes an electromotor as a power source is required to be provided with a cooling system for dissipating heat of the electromotor. Wherein, liquid cooling system is one of the most frequently used cooling systems. Specifically, through setting a sleeve at an external portion of the electromotor, cooling liquid can flow through the sleeve to dissipate heat of the electromotor when needed. As such, temperature of the electric-drive component can be lowered, which ensures that the electromotor can work under an appropriate temperature range.
Moreover, for a fixing purpose, a plurality of ear-shaped portions are needed for bolting at one end of the sleeve along an axial direction, where the sleeve is set at the external portion of the electromotor. In an existing technology, as shown in FIG. 1 a to FIG. 1 b, in order to form the ear-shaped portion at one end of the sleeve, a circular-ring-shaped billet having a relative large wall thickness is required. Specifically, the wall thickness of the circular-ring-shaped billet is larger than a radial dimension of the ear-shaped portion being formed. However, in order to form the ear-shaped portion at one end of the sleeve and achieve a sleeve with a satisfactory wall thickness, a large portion of the material of the circular-ring-shaped billet is removed during machining. As such, a large portion of the raw material is wasted. Moreover, for machining the billet with a large area, a controlling requirement for the processing is high and the processing complexity is increased, which increase the manufacturing cost. Accordingly, there is a need for an improved and simple method for manufacturing a sleeve of an electromotor. SUMMARY
The present disclosure provides a method to solve problems of high complexity, high material cost and high process cost for manufacturing a sleeve of an electric vehicle for coolant flowing through. In order to solve the problems, the present disclosure provides a method for manufacturing a sleeve for coolant flowing through, wherein the sleeve is used in an electromotor and has an ear-shaped portion for fixing at one or more ends of the sleeve along an axial direction. The method includes following steps: performing a cold bending treatment on at least one end of a circular-ring-shaped billet, to form a tapered ring which slants outwardly with a slant angle greater than 30°; heating the circular-ring-shaped billet to a yield temperature; performing a hot bending treatment on the tapered ring, to form a ring-shaped portion which slants outwardly with a slant angle of 90°; performing a heat treatment on the ring-shaped portion, to relieve stress; and performing a machining on the ring-shaped portion, to form the ear-shaped portion for fixing. Optionally, the cold bending treatment is performed for one or more times.
Optionally, the hot bending treatment is performed for one or more times.
Optionally, the tapered ring formed through the cold bending treatment has an outward slant angle of 45°.
Optionally, the yield temperature ranges from 600°C to 1200°C. Optionally, the heat treatment is performed on a bended portion of the circular-ring-shaped billet.
In comparison with existed technologies, the present disclosure possesses following advantages. A circular-ring-shaped billet with a thin wall thickness is used, which reduces the material cost. The processing procedure is only performed on an end portion of the billet, instead of the entire billet, which avoids to process the billet with a large area. Therefore, the manufacturing cost is also lowered. Moreover, accuracy requirement for the processing procedure is reduced, which further lowers the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 a and FIG. 1 b illustrate a manufacturing process of a sleeve in an electromotor according to an existing technology; and
FIG. 2a to FIG. 2d illustrate intermediate structures of manufacturing process of a sleeve in 5 an electromotor according to a first embodiment of the present disclosure.
DETAILED DESCRIPTION
As shown in FIG. 2a, according to a method for manufacturing a sleeve for coolant flowing through of the present disclosure, a wall thickness of a circular-ring-shaped billet 20 is only 10 required to be substantially equal to a wall thickness of a final product.
As shown in FIG. 2b, a cold bending treatment is performed on one end of the circular-ring- shaped billet 20 where an ear-shaped portion is needed to be formed, thus a portion of the circular-ring-shaped billet 20 slants outwardly. In such a way, a tapered ring 21 having a slant angle about 45° is formed. The portion of the circular-ring-shaped billet 20 slanting outwardly 15 has a width corresponds to a size of the ear-shaped portion to be formed.
The circular-ring-shaped billet 20 which is processed with the cold bending treatment is heated to a yield temperature (e.g., 800°C). Thereafter, a hot bending treatment is performed, so as to make the portion of the tapered ring further slants outwardly to a position perpendicular to other portions of the circular-ring shaped billet. With this, an annular portion 20 22 having a slant angle of 90° is formed, as shown in FIG. 2c. In the hot bending treatment, heat may be implemented to a portion of the circular-ring-shaped billet 20 (e.g., the portion which needs to be bended outwardly), or be implemented to the entire circular-ring-shaped billet 20.
The portion being bended outwardly is processed with a heat treatment, so as to relive stress 25 generated in the hot bending treatment. Thereafter, the ear-shaped portion 23 is formed on the annular portion 22, as shown in FIG. 2d.
In the present embodiment, the yield temperature of 800°C is just for an exemplary illustration. The yield temperature relates to material of the circular-ring-shaped billet and material of a processing mould. Normally, the yield temperature ranges from 600°C to 1200°C. If the yield 30 temperature is too low, the hot bending treatment can not be achieved, and if the yield temperature is too high, performance of the module will be affected. The present disclosure also provides another embodiment, wherein the circular-ring-shaped billet may be the same with the above recited embodiment.
One end of the circular-ring-shaped billet, where an ear-shaped portion needs to be formed, is processed with a first cold bending treatment, thus a portion of the circular-ring-shaped billet slants outwardly to form a first tapered ring having a slant angle about 30°. The portion of the circular-ring-shaped billet slanting outwardly has a width corresponds to a size of the ear- shaped portion to be formed.
The first tapered ring is further processed with a second cold bending treatment, so as to form a second tapered ring having a slant angle about 60°. The circular-ring-shaped, which is processed with the cold bending treatment for twice, is heated to a yield temperature (e.g., 800°C). Thereafter, a hot bending treatment is performed, so as to make the second tapered ring further slant outwardly to a position perpendicular to other portions of the circular-ring shaped billet. In such a way, an annular portion having a slant angle of 90° is formed. The portion being bended outwardly is processed with a heat treatment, so as to relive stress generated in the hot bending treatment. Thereafter, the ear-shaped portion being needed is formed on the annular portion.
Although the present disclosure has been disclosed above with reference to preferred embodiments thereof, it should be understood by those skilled in the art that various changes may be made without departing from the spirit or scope of the disclosure. Accordingly, the present disclosure is not limited to the embodiments disclosed.

Claims

Claims
1. A method for manufacturing a sleeve for coolant flowing through, wherein the sleeve is used in an electromotor and has an ear-shaped portion (23) for fixing at one or more ends of the sleeve along an axial direction, characterized by comprising following steps:
performing a cold bending treatment on at least one end of a circular-ring-shaped billet (20), to form a tapered ring (21 ) that slants outwardly with a slant angle greater than 30°; heating the circular-ring-shaped billet (20) to a yield temperature; performing a hot bending treatment on the tapered ring (21 ), to form a ring-shaped portion (22) that slants outwardly with a slant angle of 90°; performing a heat treatment on the ring-shaped portion (22) to relieve stress; and performing a machining on the ring-shaped portion (22) to form the ear-shaped portion
(23) for fixing.
2. The method for manufacturing a sleeve according to claim 1 , characterized in that, the cold bending treatment is performed for one or more times.
3. The method for manufacturing a sleeve according to claim 1 , characterized in that, the hot bending treatment is performed for one or more times.
4. The method for manufacturing a sleeve according to claim 1 , characterized in that, the tapered ring (21 ) formed through the cold bending treatment has an outward slant agle of 45°.
5. The method for manufacturing a sleeve according to any one of claims 1 to 3, charac- terized in that, the yield temperature ranges from 600°C to 1200°C.
6. The method for manufacturing a sleeve according to any one of claims 1 to 3, characterized in that, the heat treatment is performed on a bended portion of the circular-ring- shaped billet (20).
PCT/EP2016/069331 2016-08-15 2016-08-15 Method for manufactering sleeve Ceased WO2018033195A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2016/069331 WO2018033195A1 (en) 2016-08-15 2016-08-15 Method for manufactering sleeve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2016/069331 WO2018033195A1 (en) 2016-08-15 2016-08-15 Method for manufactering sleeve

Publications (1)

Publication Number Publication Date
WO2018033195A1 true WO2018033195A1 (en) 2018-02-22

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PCT/EP2016/069331 Ceased WO2018033195A1 (en) 2016-08-15 2016-08-15 Method for manufactering sleeve

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Country Link
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050275223A1 (en) * 2004-06-10 2005-12-15 Nippon Steel Corporation Integrally formed flanged metal pipe and method of manufacturing thereof
US20120131981A1 (en) * 2010-11-29 2012-05-31 Mach IP LLC Cold Forged Stub End
CN103736895A (en) * 2014-01-16 2014-04-23 信盛(泰州)五金锻造有限公司 Steel tube opening right-angle flanging die and forging and forming method thereof
CN102303070B (en) * 2011-09-20 2015-11-18 上海尊马汽车管件股份有限公司 A kind of processing method of shaft sleeve used for automobile steering transmission and mould

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050275223A1 (en) * 2004-06-10 2005-12-15 Nippon Steel Corporation Integrally formed flanged metal pipe and method of manufacturing thereof
US20120131981A1 (en) * 2010-11-29 2012-05-31 Mach IP LLC Cold Forged Stub End
CN102303070B (en) * 2011-09-20 2015-11-18 上海尊马汽车管件股份有限公司 A kind of processing method of shaft sleeve used for automobile steering transmission and mould
CN103736895A (en) * 2014-01-16 2014-04-23 信盛(泰州)五金锻造有限公司 Steel tube opening right-angle flanging die and forging and forming method thereof

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