KR20170108486A - Automatic transmission, Overdrive clutch hub inner race and its manufacturing method - Google Patents

Automatic transmission, Overdrive clutch hub inner race and its manufacturing method Download PDF

Info

Publication number
KR20170108486A
KR20170108486A KR1020160032474A KR20160032474A KR20170108486A KR 20170108486 A KR20170108486 A KR 20170108486A KR 1020160032474 A KR1020160032474 A KR 1020160032474A KR 20160032474 A KR20160032474 A KR 20160032474A KR 20170108486 A KR20170108486 A KR 20170108486A
Authority
KR
South Korea
Prior art keywords
overdrive clutch
inner race
tooth
overdrive
workpiece
Prior art date
Application number
KR1020160032474A
Other languages
Korean (ko)
Inventor
장준수
장경재
Original Assignee
장준수
장경재
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 장준수, 장경재 filed Critical 장준수
Priority to KR1020160032474A priority Critical patent/KR20170108486A/en
Publication of KR20170108486A publication Critical patent/KR20170108486A/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/26—Generation or transmission of movements for final actuating mechanisms
    • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
    • F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
    • 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
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • 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
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12—Forming profiles on internal or external surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/022—Special design or construction multi-stage forging presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/04—Piercing presses
    • 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
    • B21K1/00—Making machine elements
    • B21K1/28—Making machine elements wheels; discs
    • B21K1/40—Making machine elements wheels; discs hubs

Abstract

The present invention relates to a method of manufacturing an overdrive clutch hub for an automotive transmission, and more particularly, to a method of manufacturing an overdrive clutch hub for an automotive transmission, which comprises forming a workpiece having a rough inner race portion and an outline contour shape by hot forging a raw material, A step of forming a work material into a predetermined size for cold forming,
The machining material is inserted into the overdrive clutch part dice so as to be placed on the upper part of the overdrive clutch part tooth type and the upper part of the inner surface of the workpiece is pressed by pressing the punch to form the overdrive clutch part and the overdrive clutch part tooth A cold forming step of an overdrive clutch portion tooth to form an overdrive clutch portion tooth profile,
The work material having the overdrive clutch portion and the overdrive clutch portion teeth is inserted into the inner race portion dice to be positioned on the upper portion of the inner race portion dice and then the punch is pressed to push the surface of the workpiece upward, An inner race beating-type cold forming step of forming an inner race race portion,
The surface of the workpiece is pushed out to remove unnecessary protruding structure and the outer diameter to be brought into close contact with the bearing is turned for the precision of the overdrive clutch hub and the inner diameter is turned so that the inner diameter tooth to be formed in the inner diameter can be precisely formed A precision machining step for machining,
A broaching step of blowing the inner diameter to form an inner diameter tooth,
An oil hole piercing step of forming an oil hole so that lubricating oil can permeate into the overdrive clutch hub so as to be lubricated smoothly,
A heat treatment step of increasing the rigidity of the overdrive Huff clutch through a heat treatment by a carburizing method and a grinding step of grinding the outer diameter so that the formed outer diameter satisfies the bearing tolerance.

Description

Technical Field [0001] The present invention relates to an inner race of an automatic transmission for a vehicle, an overdrive clutch hub,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a manufacturing method for integrally forming an inner race and an overdrive clutch hub of an automatic transmission for a vehicle, and more particularly, to a method of manufacturing an overdrive clutch hub in which an end of a toothed portion is brought into contact with a lower portion of an outer diameter, The present invention relates to an inner race, an overdrive clutch hub, and a manufacturing method of an inner race of an automatic transmission for a vehicle, in which a work material is pushed and pressed by using a punch so that a precise tooth profile can be formed without post processing.

Generally, an automatic transmission of a vehicle is provided with a multi-stage transmission mechanism, and one of the gear stages is selected and operated so as to transmit power according to the running state of the vehicle.

The above-mentioned automatic transmission includes an inner race and an overdrive clutch hub. In the inner race and the overdrive clutch hub, a plurality of teeth are formed on the outer circumferential surfaces of the overdrive clutch portion and the inner race portion, have.

The conventional inner race and overdrive clutch hub are formed to respectively form an overdrive clutch portion and an inner race portion and are coupled by electron beam welding. When the overdrive clutch portion and the inner race portion are coupled through welding as described above, The inner race and overdrive clutch hub are subjected to a large load because the centers of the inner race and inner race portions do not coincide exactly with each other and the inner race portion is thick when the inner race and overdrive clutch hub are heat treated. However, since the overdrive clutch portion is thin, deformation is caused in the carburizing heat treatment. Therefore, the manufacturing cost of the inner race and the overdrive clutch hub increases due to the expensive gas nitriding process. There is a problem that an error occurs when welding the inner race portion, resulting in frequent defects in the product resulting in financial damages.

A manufacturing method for integrally forming the inner race and the overdrive clutch hub in order to solve the above problems is already known from the patent application 10-2015-0101974 filed by the present applicant.

However, the inner race and overdrive clutch hub formed by the above-described method can solve the above-mentioned problem. However, in order to form the teeth of the overdrive clutch portion which abuts the lower portion of the outer diameter, The overdrive clutch portion can not be precisely formed until the end of the overdrive clutch portion due to the repulsive force generated by the overdrive clutch portion and the post-machining process can not be performed in order to properly form the teeth of the overdrive clutch portion. There is a problem that the cost is further increased.

Japanese Patent Application Laid-Open No. 10-2015-0101974 (Method of manufacturing overdrive clutch hub of an automatic transmission for a vehicle)

SUMMARY OF THE INVENTION The object of the present invention is to provide an overdrive clutch device and a method of manufacturing the same which are capable of precisely forming the teeth of the overdrive clutch portion without a post- And thus,

The overdrive clutch hub and the overdrive clutch hub of the vehicular automatic transmission that can eliminate the gas nitriding process which requires a large cost by integrally forming the inner race portion and the overdrive clutch portion by the carburizing heat treatment having the durability greatly improved, And a manufacturing method thereof.

According to an aspect of the present invention, there is provided a method of forming a workpiece having an inner race portion and an outline of an outer diameter by hot forging a raw material, annealing the workpiece so as to improve moldability, A workpiece forming step of processing the workpiece to a predetermined size for the workpiece,

The machining material is inserted into the overdrive clutch part dice so as to be placed on the upper part of the overdrive clutch part tooth type and the upper part of the inner surface of the workpiece is pressed by pressing the punch to form the overdrive clutch part and the overdrive clutch part tooth A cold forming step of an overdrive clutch portion tooth to form an overdrive clutch portion tooth profile,

The work material in which the overdrive clutch portion and the overdrive clutch portion tooth are formed is inserted into the inner race portion dice and positioned on the upper portion of the inner race portion die. Then, the punch is pressed to push the surface of the workpiece upward, An inner race-like cold forming step of forming a race portion and an inner race portion,

The surface of the workpiece is pushed out to remove unnecessary protruding structure and the outer diameter to be brought into close contact with the bearing is turned for the precision of the overdrive clutch hub and the inner diameter is turned so that the inner diameter tooth to be formed in the inner diameter can be precisely formed A precision machining step for machining,

A broaching step of blowing the inner diameter to form an inner diameter tooth,

An oil hole piercing step of forming an oil hole so that lubricating oil can permeate into the overdrive clutch hub so as to be lubricated smoothly,

The overdrive clutch hub may be formed through a heat treatment step for increasing the rigidity of the overdrive Huff clutch through a heat treatment by a carburization method and a grinding step for grinding the outer diameter so that the outer diameter of the overdrive Huff clutch can satisfy the bearing tolerance.

According to the present invention, the punch is lowered and the workpiece is pushed down and pressed to form the teeth of the overdrive clutch portion, so that the workpiece does not clump and the repulsive force is not generated so much that the punch can be properly lowered to the end, There is an effect that the teeth of the overdrive clutch portion can be formed and there is no need to finish the teeth of the overdrive clutch portion,

Further, since the inner race portion and the overdrive clutch portion are integrally formed, the durability is greatly improved and the heat treatment cost is reduced by the carburizing heat treatment which is low in cost, so that the gas nitriding process which requires a large cost can be eliminated, There is an effect that can be saved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an overall structure of an inner race, an overdrive clutch hub formed by the present invention;
Fig. 2 is a schematic view showing the steps of manufacturing the inner race and overdrive clutch hub according to the present invention. Fig.
3 is an exemplary view showing a state before pressurization in the cold forming step of the overdrive clutch portion of the present invention
4 is an exemplary view showing a state after pressurization in the cold forming step of the overdrive clutch portion of the present invention
5 is an exemplary view showing a state before pressurization in the cold forming step of the inner race portion of the present invention
6 is an exemplary view showing a state after pressurization in the cold forming step of the inner race portion of the present invention

Hereinafter, an inner race, an overdrive clutch hub, and a manufacturing method thereof of an automatic transmission for a vehicle according to the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention.

First, an inner race portion 14 of a large diameter is formed at an upper portion of an inner race and an overdrive clutch hub of an automatic transmission for a vehicle. A plurality of inner race portions 14a are formed at the outer peripheral surface of the inner race portion 14 15 are formed.

A lower portion of the inner race portion 14 is formed with an outer diameter 13 formed by precision machining to closely contact the bearing and an overdrive clutch portion 11 is formed below the outer diameter portion 13.

A plurality of overdrive clutch teeth (12) are formed on the outer circumferential surface of the overdrive clutch portion (11), and the inner side of the overdrive clutch hub is formed to pass through. The inner diameter A plurality of inner diameter teeth 17 are formed.

The outer race of the inner race and the overdrive clutch hub has a plurality of oil holes 18 formed therein so that the lubricating oil can penetrate into the inner race and the lubricating oil can be properly lubricated.

The overdrive clutch portion 11 and the overdrive clutch portion tooth 12 are formed by pressing the upper surface of the inner surface of the workpiece by press-pressing the punch, though the above-described configuration is a general configuration of the inner race and overdrive clutch hub of the automatic transmission. It is characterized by being cold-formed.

Hereinafter, the production method of the present invention will be described in detail.

Step 1 - Step of forming workpiece

The raw material 1 prepared for forming the inner race and the overdrive clutch hub is hot forged to form the working material 10 having the approximate inner race portion 14 and the outline shape of the outer diameter 13. The work material 10 is formed to have a sufficiently large thickness so that the overdrive clutch portion 11 can be formed by pressing the punch and annealing is performed by annealing so as to improve moldability, And then processed to a predetermined size.

Second Step - Cold Forming Step of Overdrive Clutch Tooth

The machining material 10 formed through the one step is inserted into the overdrive clutch part dice 20 so as to be placed on the upper part of the overdrive clutch part tooth 21 and the punch is press- To press the upper portion of the inner surface of the plate.

As described above, when the upper portion of the workpiece 10 is pressed by the punch, the surface of the workpiece 10, which is formed thickly, is pushed down by the pressure of the punch and pressed against the overdrive clutch die tooth 21 and the punch. And a plurality of overdrive clutch teeth 12 are formed on the outer circumferential surface of the overdrive clutch portion 11.

The overdrive clutch portion 11 and the overdrive clutch teeth 12 formed by compression as described above are more densely packed with the internal structure than before the compression, and the durability of the overdrive clutch portion 12 is increased. The surface of the workpiece 10 pushed along the inner surface of the flange 21 is smoothly pressed without being clumped to form the precise overdrive clutch teeth 12.

Third Step - Inner Race Tooth Cold Forming Step

The processing material 10 in which the overdrive clutch portion 11 and the overdrive clutch tooth tooth 12 are formed is inserted into the inner race portion dice 22 through the second process to form the inner race portion tooth 23, As shown in FIG.

As described above, the surface of the workpiece 10 positioned on the upper portion of the inner race portion-to-be-machined die 23 is placed on the upper surface of the inner race portion-toothed dice 23, The punch is press-pressed to push the surface of the workpiece 10 upward, thereby forming the inner race portion 14 and the inner race portion 15.

Fourth step - Precision processing step

The upper surface of the workpiece 10 on which the inner race isotope 15 is formed by the third step is pushed out of the surface of the workpiece 10 forming the inner race tooth 15, So that the inner race tooth 15 can be precisely formed.

Thereafter, the outer diameter 13 to be brought into close contact with the bearing is subjected to turning for the sake of precision of the inner race and the overdrive clutch hub, and the inner diameter is turned so that the inner diameter tooth 17 to be formed on the inner diameter 16 can be precisely formed .

Fifth step - Broaching step

The inner diameter 16 and the inner diameter 16 of the workpiece 10, which have been machined by the turning of the inner and outer diameters, are formed through the broaching process.

Step 6 - Oil hole piercing step

An oil hole 18 is formed at a plurality of positions so as to penetrate the surface of the overdrive clutch hub so that the lubricating oil can permeate to smoothly lubricate the overdrive clutch hub.

Seventh Process - Heat Treatment Step

When the piercing of the oil hole is completed, the inner race and the overdrive clutch hub are completed. The inner race and the overdrive clutch hub thus formed are cured by heat treatment.

Since the inner race and the overdrive clutch hub formed as described above are integrally formed and the deformation caused by the heat treatment is small, the entire inner race and overdrive clutch hub can be heat-treated by the carburizing method, , It is not necessary to perform the gas nitriding process used in the overdrive clutch portion, and the cost competitiveness can be secured.

Step 8 - Grinding step

After the heat treatment, the inner race and overdrive clutch hub finish the machining of the overdrive clutch hub by grinding the outer diameter (13) in close contact with the bearing so as to satisfy the bearing tolerance.

According to the method for manufacturing the inner race and the overdrive clutch hub of the above automatic transmission for a vehicle, the prepared raw material 1 is formed by the hot working forging 10, the formed workpiece 10 is annealed, It makes the castle look good.

The surface of the workpiece 10 pushed by the punch through press-pressing is pressed between the overdrive clutch die tooth 21 and the punch as described above for the workpiece 10 annealed, So that the overdrive clutch portion 11 and the overdrive clutch tooth portion 12 are formed.

The overdrive clutch teeth 12 formed as described above are formed precisely up to the end of the teeth because the work material is gathered and no repulsive force is generated. This causes the overdrive clutch teeth 12 to take a lot of time and a lot of work It is possible to provide an effect of improving the productivity because there is no need to perform post-processing, and it is also possible to provide an effect of reducing post-processing cost and increasing price competitiveness.

Since the overdrive clutch portion 11 and the overdrive clutch tooth portion 12 are tightly formed in such a manner that the internal structure of the workpiece 10 in a loose state is narrowed by the compression, The rigidity of the drive clutch portion 11 and the overdrive clutch portion tooth 12 can be greatly improved.

The inner race portion 14 and the inner race portion 15 which are formed through the press-pressing are likewise pushed by the surface of the workpiece 10 and the surrounding tissue is made into a compact shape. Therefore, the inner race portion 14 and the inner race portion 14, The stiffness of the race portion 15 can be greatly improved.

Since the inner race and the overdrive clutch hub integrally formed are less deformed by the heat treatment, the inner race and the overdrive clutch hub can be heat-treated by the carburizing method at a low cost, It is possible to provide an effect of enhancing price competitiveness.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

1: raw material 10: processing material
11: overdrive clutch part 12: overdrive clutch part tooth type
13: outer diameter 14: inner race portion
15: Inner race notch 16: Inner diameter
17: Inner diameter tooth 18: Oil hole
20: Overdrive clutch part die
21: Overdrive clutch part tooth type
22: Inner race part Dice 23: Inner race part type die

Claims (2)

A method of manufacturing an inner race or overdrive clutch hub of an automatic transmission for a vehicle,
The raw material 1 is hot-knitted to form a rough work piece 10 having an outline shape of an inner race portion 14 and an outer diameter portion 13, annealing is performed so as to improve moldability, A workpiece forming step of machining the workpiece to a predetermined dimension for the workpiece;
The machining material 10 is inserted into the overdrive clutch part dice 20 so as to be placed on the upper part of the overdrive clutch part tooth 21 and the punch is press- Forming an overdrive clutch portion (11) and an overdrive clutch portion tooth (12) by pressurizing the overdrive clutch portion (12);
The overdrive clutch portion 11 and the workpiece material 10 formed on the overdrive clutch portion tooth 12 are inserted into the inner race portion dice 22 and positioned on the upper portion of the inner race portion tooth 23 A cold forming step of an inner race portion in which an inner race portion 14 and an inner race portion 15 are formed by pushing the punch to push the surface of the workpiece 10 upward;
The outer diameter 13 to be brought into close contact with the bearing is turned for the sake of the precision of the overdrive clutch hub and the outer diameter of the inner diameter tooth 16 to be formed in the inner diameter 16 17) is precisely formed;
A broaching step of broaching the inner diameter (16) to form an inner diameter tooth (17);
An oil hole piercing step of forming an oil hole (18) allowing the lubricating oil to permeate into the inner race, the overdrive clutch hub, so that the lubricating oil can be smoothly lubricated;
A heat treatment step of increasing the rigidity of the overdrive Huff clutch through heat treatment by a carburizing method; And
And grinding the outer diameter (13) so that the formed outer diameter (13) can satisfy the bearing tolerance. The machining material is inserted into the overdrive clutch part dice by the method of claim 1 so as to be placed on the upper part of the overdrive clutch part tooth and the upper part of the inner surface of the workpiece is pressed by pressing the punch, And the overdrive clutch portion tooth is cold-formed. The inner race of the overdrive clutch hub of the vehicular automatic transmission.
KR1020160032474A 2016-03-18 2016-03-18 Automatic transmission, Overdrive clutch hub inner race and its manufacturing method KR20170108486A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160032474A KR20170108486A (en) 2016-03-18 2016-03-18 Automatic transmission, Overdrive clutch hub inner race and its manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160032474A KR20170108486A (en) 2016-03-18 2016-03-18 Automatic transmission, Overdrive clutch hub inner race and its manufacturing method

Publications (1)

Publication Number Publication Date
KR20170108486A true KR20170108486A (en) 2017-09-27

Family

ID=60036443

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020160032474A KR20170108486A (en) 2016-03-18 2016-03-18 Automatic transmission, Overdrive clutch hub inner race and its manufacturing method

Country Status (1)

Country Link
KR (1) KR20170108486A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210339306A1 (en) * 2019-04-23 2021-11-04 National University Corporation Tokai National Higher Education And Research System Precision forging method, precision forging device, and precision forging product

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210339306A1 (en) * 2019-04-23 2021-11-04 National University Corporation Tokai National Higher Education And Research System Precision forging method, precision forging device, and precision forging product
US11925972B2 (en) * 2019-04-23 2024-03-12 National University Corporation Tokai National Higher Education And Research System Precision forging method, precision forging device, and precision forging product

Similar Documents

Publication Publication Date Title
JP3108710B2 (en) Method of manufacturing gear for transmission
US20100083783A1 (en) Forming preforms and parts therefrom
CN109195726B (en) Cylindrical ring member, bearing, clutch, vehicle, and machine manufacturing method
KR102150511B1 (en) Manufacturing method of clutch hub for automobile air conditioner compressor
WO2009136532A1 (en) Retainer for roller bearing, roller bearing, and method of manufacturing retainer for roller bearing
KR100851651B1 (en) Annular component fabricating method, die for use in such fabricating method and annular component fabricated thereby
KR102253535B1 (en) Method for Producing Stamped Parts
KR100576624B1 (en) Method for the manufacture of hub-flange for clutch
KR101749477B1 (en) Manufacturing method of hub for electromagnetic clutch
JP4080182B2 (en) SHELL TYPE NEEDLE ROLLER BEARING AND MANUFACTURING METHOD THEREOF
KR20170108486A (en) Automatic transmission, Overdrive clutch hub inner race and its manufacturing method
WO2006040840A1 (en) Method for manufacturing toothed parts
JP2014091125A (en) Steel component different in carbon content and method of manufacturing the same
JP4650632B2 (en) Gear structure and pinion gear
KR100705535B1 (en) Manufacturing process of spline shaft
JP2011177740A (en) Method of forming tooth shape of sheet metal plate and tooth-shaped product
JP2011098380A (en) Method of manufacturing steel plate-like component, pole parking and cold forging metallic mold
KR101736837B1 (en) Over driver hub clutch process of manufacture of automatic transmission for cars
KR200458880Y1 (en) Forging shape for the lower part spline of one way clutch inner race in 6-speed automatic transmission
JP4145924B2 (en) Tooth profile forming method
JP6576851B2 (en) Half blanking test method
CN113478188B (en) Parking gear tooth profile lateral extrusion forming method
CN111133228A (en) Continuously variable transmission and method of manufacturing the same
JP2014066336A (en) Gear with flange
US20210323062A1 (en) Apparatus and Method for Internal Surface Densification of Powder Metal Articles

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal