KR101638337B1 - Method for manufacturing valve housing - Google Patents

Method for manufacturing valve housing Download PDF

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Publication number
KR101638337B1
KR101638337B1 KR1020160010352A KR20160010352A KR101638337B1 KR 101638337 B1 KR101638337 B1 KR 101638337B1 KR 1020160010352 A KR1020160010352 A KR 1020160010352A KR 20160010352 A KR20160010352 A KR 20160010352A KR 101638337 B1 KR101638337 B1 KR 101638337B1
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KR
South Korea
Prior art keywords
valve seat
valve
inner core
housing
valve housing
Prior art date
Application number
KR1020160010352A
Other languages
Korean (ko)
Inventor
정영호
Original Assignee
한미에이디엠 (주)
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Priority to KR1020160010352A priority Critical patent/KR101638337B1/en
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Publication of KR101638337B1 publication Critical patent/KR101638337B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/04—Casting in, on, or around objects which form part of the product for joining parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Lift Valve (AREA)

Abstract

The present invention relates to a method to manufacture a valve housing and, more specifically, relates to a method to manufacture the valve housing of an exhaust gas recirculation (EGR) valve. The valve housing manufacturing method comprises: a step of manufacturing an upper valve seat which opens and closes a flow path formed in a valve housing by being in contact or being separated from a valve equipment, including an inner core and a valve seat main body, and having the inner core and the valve seat main body formed with different materials; a step of integrating the main body of the valve housing with the upper valve seat by inserting and casting the upper valve seat into a valve housing mold; and a step of removing the inner core of the upper valve seat.

Description

[0001] METHOD FOR MANUFACTURING VALVE HOUSING [0002]

The present invention relates to a valve housing, and more particularly, to a method of manufacturing a valve housing of an exhaust gas recirculation valve for a vehicle.

An EGR valve, that is, an exhaust gas recirculation valve, is being used to reduce nitrogen oxides (NOx) in automotive exhaust gases.

The EGR valve extracts a part of the exhaust gas and supplies it to the combustion chamber again, thereby lowering the combustion temperature at the time of combustion, thereby reducing nitrogen oxides. More specifically, the inert gas such as CO 2 or H 2 O contained in the exhaust gas is replaced with a part of the intake gas and mixed into the combustion chamber, thereby increasing the heat capacity of the mixed gas, suppressing the temperature rise of the combustion gas in the combustion chamber, And a portion of the intake gas is replaced with an exhaust gas having a low oxygen concentration, so that oxygen in the combustion chamber is reduced and the amount of NOx generated can be reduced.

This EGR valve is composed of a valve housing constituting an exhaust gas flow path and a valve mechanism for opening and closing a flow path formed by the valve housing. The valve housing is mostly made of aluminum material, and die casting for injecting molten metal into the mold And machining center (MCT) machining to produce valve housings.

A portion of the valve housing that regulates the opening and closing of the exhaust gas passage in the valve through contact with the valve mechanism is referred to as a valve seat. When the passage is closed, the valve seat of the valve housing and the valve mechanism closely contact each other, Do not leak.

Normally, the valve mechanism is made of stainless steel material, for example, SUS 304.

Considering that the valve housing is made of aluminum material, when the valve seat is made of aluminum material in the same way as the valve housing, the valve seat is opened and closed by operating the valve mechanism to open or close the exhaust gas passage in the valve housing. There is a possibility that the valve seat wears and deforms.

If the valve seat wears or deformation occurs on the valve seat, even if the valve mechanism contacts the valve seat, there is a gap in the valve mechanism and the valve seat due to wear or deformation of the valve seat, Which may lead to lower efficiency or environmental pollution.

Therefore, the valve seat of the valve housing is made of stainless steel material such as SUS 304, which is the same as the material of the valve mechanism.

In manufacturing the valve housing, a valve seat top and a valve seat lower made of stainless steel are manufactured by cutting and pressing, and these valve seats are molded into a mold for valve housing casting After the insert, the valve housing can be manufactured by integrating the valve housing body, the upper valve seat and the lower valve seat by die casting for injecting the molten metal into the mold.

6 and 7 show an upper valve seat and a lower valve seat for use in the manufacture of a conventional valve housing.

Fig. 6 shows the upper valve seat, and Fig. 7 shows the lower valve seat. Both the upper valve seat and the lower valve seat are formed in an annular shape, and a through hole is formed at the center of the upper valve seat and the exhaust gas passage.

The upper valve seat and the lower valve seat are formed with a plurality of grooves in the circumferential direction together with the step difference. When the valve seat is inserted into the mold and the upper valve seat and the lower valve seat are molded, And a structure for increasing the coupling force between the body and the valve seat.

Further, the upper valve seat and the lower valve seat of the valve housing are formed in different shapes.

The valve seat is manufactured through cutting and pressing. Since the valve seat is made of stainless steel material, the workability is not good, and the machining amount becomes excessive, loss of press process occurs, and the machining dimension becomes unstable. There is a problem that the process time and the process cost are large in manufacturing the valve seat.

Therefore, a construction for reducing the processing load in manufacturing the upper and lower valve seats in the manufacturing process of the valve housing was required.

Korean Patent Laid-Open Publication No. 10-2014-0105215 (published on Apr. 01, 2014) discloses a method for increasing the productivity through the casting mold using the core for the casting of the EGR valve housing and the core thereof, But there is no solution to the problem.

Korean Patent Publication No. 10-2014-0105215 (published on April 1, 2014)

In the present invention, the amount of processing cut, which is a problem that occurs when a valve seat is manufactured in the manufacturing process of a valve housing, becomes excessive and loss of a press process occurs, thereby making the machining dimensions unstable. Process time and process cost are large.

In order to solve the above problems, the present invention provides a method of manufacturing a valve housing, comprising the steps of: opening and closing a flow passage formed in the valve housing in contact with or spaced from the valve mechanism, the valve comprising an inner core and a valve seat body, A method of manufacturing an upper valve seat, the method comprising: fabricating an upper valve seat having a sheet body made of a different material; Inserting and casting the upper valve seat into a valve housing mold to integrate the valve housing body and the upper valve seat; And removing the inner core of the upper valve seat.

According to the present invention, the step of manufacturing the upper valve seat may include the steps of: preparing an inner core made of a first material; The method comprising: fabricating a valve seat body made of a second material different from the first material; And inserting the inner core into the valve seat body.

Further, the present invention provides a method of manufacturing a valve housing, further comprising the step of opening and closing the flow passage in the valve housing in contact with the valve, and manufacturing a lower valve seat composed only of the valve seat body.

Further, according to the present invention, the valve seat bodies of the upper valve seat and the lower valve seat have the same shape.

According to the present invention, the first material is aluminum, and the second material is stainless steel.

According to the present invention, in the step of inserting and molding the upper valve seat into the valve housing mold and integrating the valve housing and the upper valve seat, the direction in which the inner core is inserted into the valve seat body, Wherein the step of removing the inner core of the upper valve seat by inserting the upper valve seat into the valve housing such that the direction in which the cutting tool is inserted into the valve housing is the same to remove the inner core, So as not to be detached from the sheet.

According to the present invention, the valve housing is an exhaust gas recirculation valve for a vehicle.

Also, a valve housing manufactured according to the manufacturing method of the present invention is provided.

In the valve seat used in the manufacture of the valve housing according to the present invention, the valve seat is provided with an inner core made of a first material and a second material made of a second material different from the first material, There is provided a valve seat including a valve seat body and the inner core being inserted into the valve seat body.

According to the present invention, the first material is aluminum and the second material is stainless steel.

Through the embodiment of the present invention, the valve seat body and the inner core are divided into the valve seat body and the inner core, and the valve seat body and the inner core are formed of materials different from each other, thereby reducing the processing load in manufacturing the valve housing, .

In addition, since the material of the valve seat body and the valve mechanism, which are in contact with the valve mechanism in the valve housing, can be made the same, the wear and deformation of the valve seat can be prevented, One can prevent environmental pollution.

Also, since the upper valve seat is composed of the valve seat body and the inner core, and the lower valve seat is formed only of the valve seat body, the upper valve seat and the lower valve seat commonly use the valve seat body, Saving effect can be seen.

1 is a sectional view showing a cross-section of a valve housing according to the present invention.
Fig. 2 shows a valve seat body of the valve housing according to the present invention, Fig. 2 (a) is a front view of the valve seat body, and Fig. 2 (b) is a sectional view of the valve seat body.
Figure 3 shows an inner core of a valve housing according to the invention, Figure 3 (a) is a front view of the inner core, and Figure 3 (b) is a cross-sectional view of the inner core.
4 (a) is a front view of a structure in which a valve seat body and an inner core are combined, and FIG. 4 (b) is a front view of the valve seat body and an inner core, Sectional view.
5 is a process flow chart for manufacturing a valve housing according to the present invention.
Fig. 6 shows an upper valve seat of a valve housing according to the prior art, Fig. 6 (a) is a front view of the upper valve seat, and Fig. 6 (b) is a sectional view of the upper valve seat.
Fig. 7 shows a lower valve seat of the valve housing according to the prior art. Fig. 7 (a) is a front view of the lower valve seat, and Fig. 7 (b) is a sectional view of the lower valve seat.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular form may be interpreted to include plural forms unless specifically stated otherwise. The word " comprises "and / or" comprising ", as used in the specification, mean that, in addition to the components, steps, operations and / or elements mentioned, one or more other components, / RTI > does not exclude the presence or addition of < RTI ID = 0.0 >

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.

1 is a sectional view showing a cross section of a valve housing 1 according to the present invention.

The EGR valve for a vehicle may include a valve housing 1 and a valve mechanism (not shown) so that the exhaust gas can be recirculated. The valve housing 1 is formed with a flow passage through which exhaust gas passes. The molten metal such as aluminum is injected into a mold having the shape of the valve housing 1, and the die can be manufactured through a casting process such as die casting.

The valve housing 1 includes a valve housing body 10 having an exhaust gas passage therein and formed by curing the molten metal in accordance with the shape of the metal during the casting process, And a valve seat 20, 30 for opening and closing the flow passage formed in the valve seat 20.

The valve housing body 10 is formed by a casting process. In this embodiment, the molten metal injected into the mold is made of aluminum, but it is also possible to form the valve housing body 10 with other molten metal used in the casting process have.

The valve seat 20, 30 may include an upper valve seat 20 and a lower valve seat 30.

The upper valve seat 20 and the lower valve seat 30 respectively act on the valve mechanism to seal or open the exhaust gas passage formed in the valve housing body 10. [

Specifically, when the valve mechanism is actuated and brought into intimate contact with the upper valve seat 20, the flow passage through the upper valve seat 20 may be closed to prevent the exhaust gas from entering or flowing out. On the contrary, when the valve mechanism is operated and separated from the upper valve seat 20 in a state in which the valve mechanism is in close contact with the upper valve seat 20, the flow passage through the upper valve seat 20 is opened, Can be done.

In the case of the EGR valve for a vehicle, since the valve mechanism and the upper valve seat 20 and the lower valve seat 30 in the valve housing 1 are repeatedly contacted and spaced repeatedly in the exhaust gas recirculation process, The portion of the upper valve seat 20 and the lower valve seat 30, which is in contact with the valve mechanism, may be made of a stainless steel material having the same material as the valve mechanism. Though the present embodiment is made of stainless steel, it is not limited to a material having physical properties capable of coping with wear and deformation.

The upper valve seat 20 and the housing body 10 can be joined at the upper valve seat engaging portion 11 through the casting process. When the housing body 10 is formed through the casting process, the upper valve seat 20 is coupled to the housing body 10 at the upper valve seat engaging portion 11 by being inserted into the mold, In the same manner, the lower valve seat 30 is engaged with the housing body 10 at the lower valve seat engaging portion 12.

Fig. 2 shows the valve seat body 21 of the valve housing 1 according to the invention, Fig. 3 shows the inner core 22 and Fig. 4 shows the valve seat body 21 and the inner core 22, The upper valve seat 20 and the lower valve seat 20 are formed.

The valve seat body 21 is formed in an annular shape and a through hole through which the exhaust gas can pass is present in the center of the valve seat body 21. [ A plurality of grooves are formed in the circumferential direction on the outer circumference of the valve seat body 21. When the valve seat body 21 is inserted into the mold and the shape of the valve housing 1 is cast, And the valve seat body 21 can be increased.

The inner core 22 of FIG. 3 to be described later is inserted into the through hole of the valve seat body 21 to form the upper valve seat 20 as shown in FIG.

The valve seat body 21 is made of stainless steel and can be manufactured in a shape as shown in Fig. 2 through cutting and pressing.

The inner core 22 has a circular shape and a through hole is located at the center. The upper surface of the inner core 22 may protrude to form a step surface on the outer periphery of the inner core 22. [ The inner core 22 is made of aluminum and can be formed into a shape shown in FIG. 3 through a process such as casting, cutting, and pressing.

The upper valve seat 20 may be formed by joining the valve seat body 21 and the inner core 22 together. The inner core 22 may be inserted into the through hole of the valve seat body 21 and coupled to the upper surface of the valve seat body 21 so that the protruded upper surface of the inner core 22 is supported.

In this embodiment, the valve seat body 21 is made of stainless steel, the inner core 22 is made of aluminum, and the valve body comes into contact with the valve seat body 21. With this configuration, it is possible to prevent wear and deformation of the valve seat.

On the other hand, the inner core 22 can be removed through the cutting tool after the upper valve seat 20 is inserted into the mold and integrated with the valve housing body 10 in the casting process. The inner core 22 can be removed by fixing the housing body 10 and inserting the cutting tool into the housing body 10 and the cutting tool can be inserted along the center line of FIG.

As shown in Figs. 6 and 7, a typical EGR valve for a vehicle is constructed by different shapes of the upper valve seat 40 and the lower valve seat 50. Fig. In the present embodiment, the lower valve seat 30 can be constituted only by the valve seat body 21. As a result, since the upper valve seat 20 is configured by combining the valve seat body 21 and the inner core 22 and the lower valve seat 30 is formed by the valve seat body 21, the upper valve seat 20 And the lower valve seat 30 may have different shapes.

5 is a process flow chart for manufacturing a valve housing according to the present invention.

The process of manufacturing the valve housing 1 includes a process of manufacturing the upper valve seat 20 by combining the valve seat body 21 and the inner core 22, a process of manufacturing the lower valve seat 30, The upper valve seat 20 and the lower valve seat 30 are inserted and molded into a mold for forming the valve housing body 10 to form the valve housing body 10 and the upper valve seat 20 and the lower valve seat 30, And a process of inserting the cutting tool into the housing body 10 and removing the inner core 22 of the upper valve seat 20.

The upper valve seat 20 manufacturing process S10 includes the steps of manufacturing the inner core 22 by casting, cutting, pressing, and the like with aluminum material and cutting the stainless steel material by pressing and pressing the valve seat body 21 The upper valve seat 20 is manufactured by inserting the inner core 22 into the valve seat body 21 after manufacturing.

In the manufacturing process S20 of the lower valve seat 30, the lower valve seat 30 can be prepared only by the valve seat body 21 obtained by cutting and pressing the stainless steel material. Here, the valve seat body 21 of the lower valve seat 30 may be prepared in the same shape and material as the valve seat body 21 of the upper valve seat 20.

The upper and lower valve seats 20 and 30 prepared in the upper and lower valve seat 20 and 30 manufacturing processes S10 and S20 are formed through the casting process to form the valve housing body 10 and the valve housing body 10 (S30) in which the upper and lower valve seats 20, 30 are integrated with each other can be performed.

In the casting step S30 of the present embodiment, a mold for forming the valve housing body 10 is prepared, and the upper and lower valve seats 20 and 30 can be inserted into the mold.

The molten metal is injected into the mold and cured to form the valve housing body 10 and the upper valve seat engaging portion 11 of the valve housing body 10 and the lower valve seat engaging portion 11 of the valve housing body 10, The upper valve seat 20 and the lower valve seat 30 can be cured in the state where the valve seat body 10 is inserted in the valve seat engagement portion 12 to thereby secure the engagement.

In the inner core 22 removing process (S40) of the upper valve seat 20, the cutting tool may be moved into the valve housing body 10 to remove the inner core 22 through cutting. By removing the inner core 22, the area where the valve mechanism is in contact with the valve housing at the time of valve operation is limited to the valve seat body made of stainless steel material, so that wear or deformation of the valve seat can be prevented.

In order to remove the inner core 22 of the upper valve seat 20 and the direction in which the inner core 22 is inserted into the valve seat body 21 in the casting step S30 of the present embodiment, The upper valve seat 20 can be inserted into the valve housing 1 so that the direction of insertion into the valve housing 1 is the same.

With this configuration, in step S40 of removing the inner core 22 of the upper valve seat 20, the inner core 22 is prevented from falling off the valve seat body 21 due to the pressure of the cutting tool at the time of machining can do. When the upper valve seat 20 is inserted in the opposite direction, there is a possibility that the internal core 22 may be detached from the valve seat body 21 due to the pressure of the cutting tool.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention.

Accordingly, it is intended that the appended claims cover all such modifications and variations as fall within the true spirit of the invention.

1: valve housing
10: valve housing body
11: upper valve seat engaging portion
12: Lower valve seat engaging portion
20: Upper valve seat
21: valve seat body
22: Internal core
30: Lower valve seat
40: Upper valve seat of the prior art
50: Prior art bottom valve seat

Claims (10)

A method of manufacturing a valve housing,
Manufacturing an upper valve seat in contact with or spaced from the valve mechanism to open and close a flow passage formed in the valve housing and including an inner core and a valve seat body, wherein the inner core and the valve seat body are made of different materials;
Inserting the upper valve seat into the valve housing mold and casting to unify the valve housing body and the upper valve seat; And
And removing the inner core of the upper valve seat. The method according to claim 1,
Wherein the step of fabricating the upper valve seat comprises:
Fabricating an inner core of a first material;
The method comprising: fabricating a valve seat body made of a second material different from the first material; And
And inserting the inner core into the valve seat body. The method according to claim 1,
Further comprising the step of opening and closing the flow passage in the valve housing in contact with the valve mechanism to manufacture a lower valve seat composed only of the valve seat body. The method of claim 3,
Wherein the valve seat body of the upper valve seat and the valve seat body of the lower valve seat have the same shape. The method of claim 2,
Wherein the first material is aluminum and the second material is stainless steel. The method according to claim 1,
In the step of inserting the upper valve seat into the valve housing mold and casting to integrate the valve housing body and the upper valve seat,
The upper valve seat is inserted into the valve housing so that the direction in which the inner core is inserted into the valve seat body and the direction in which the cutting tool is inserted into the valve housing to remove the inner core of the upper valve seat are inserted into the valve housing, The inner core is prevented from falling off the upper valve seat during processing in the step of removing the inner core of the valve body. The method according to claim 1,
Wherein the valve housing is an exhaust gas recirculation valve for a vehicle. A valve housing manufactured according to the manufacturing method according to claim 1. A valve seat used for manufacturing a valve housing according to claim 1,
And a valve seat body which is in contact with or spaced from the valve mechanism to open and close a flow path in the housing and which is made of a second material different from the first material and which has an inner core made of a first material, Wherein the valve seat is formed in a shape of a cylinder. The method of claim 9,
Wherein the first material is aluminum and the second material is stainless steel.
KR1020160010352A 2016-01-27 2016-01-27 Method for manufacturing valve housing KR101638337B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110253214A (en) * 2019-05-24 2019-09-20 无锡亿锞精密机械有限公司 Magnetizing coil fixing seat prevents thermal deformation processing technology

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1013218B (en) * 1989-12-22 1991-07-17 綦建前 Diaphragm valve
KR20030000544A (en) * 2001-06-26 2003-01-06 현대자동차주식회사 cylinder head with valve seat and a preparing method thereof
KR20110010827A (en) * 2008-10-09 2011-02-07 미쓰비시덴키 가부시키가이샤 Egr valve device
KR20110003420U (en) * 2009-09-29 2011-04-06 주식회사 이룸지엔지 Solenoid valve
KR20140105215A (en) 2013-02-22 2014-09-01 박원철 Assembly Core for Casting Mold of EGR Valve Housing and Casting Mold using the Same.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1013218B (en) * 1989-12-22 1991-07-17 綦建前 Diaphragm valve
KR20030000544A (en) * 2001-06-26 2003-01-06 현대자동차주식회사 cylinder head with valve seat and a preparing method thereof
KR20110010827A (en) * 2008-10-09 2011-02-07 미쓰비시덴키 가부시키가이샤 Egr valve device
KR20110003420U (en) * 2009-09-29 2011-04-06 주식회사 이룸지엔지 Solenoid valve
KR20140105215A (en) 2013-02-22 2014-09-01 박원철 Assembly Core for Casting Mold of EGR Valve Housing and Casting Mold using the Same.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110253214A (en) * 2019-05-24 2019-09-20 无锡亿锞精密机械有限公司 Magnetizing coil fixing seat prevents thermal deformation processing technology
CN110253214B (en) * 2019-05-24 2022-06-14 无锡亿锞精密机械有限公司 Machining process for preventing thermal deformation of magnetizing coil fixing seat

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