KR20170000195A - A device for fixing frame for metal mask - Google Patents

A device for fixing frame for metal mask Download PDF

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Publication number
KR20170000195A
KR20170000195A KR1020150089103A KR20150089103A KR20170000195A KR 20170000195 A KR20170000195 A KR 20170000195A KR 1020150089103 A KR1020150089103 A KR 1020150089103A KR 20150089103 A KR20150089103 A KR 20150089103A KR 20170000195 A KR20170000195 A KR 20170000195A
Authority
KR
South Korea
Prior art keywords
frame
metal mask
height adjusting
fixing
fixed
Prior art date
Application number
KR1020150089103A
Other languages
Korean (ko)
Inventor
김민환
신현덕
Original Assignee
(주) 포커스레이져
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 (주) 포커스레이져 filed Critical (주) 포커스레이져
Priority to KR1020150089103A priority Critical patent/KR20170000195A/en
Publication of KR20170000195A publication Critical patent/KR20170000195A/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
    • H05K13/04—Mounting of components, e.g. of leadless components
    • H05K13/0456—Mounting of components, e.g. of leadless components simultaneously punching the circuit board
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/0011—Working of insulating substrates or insulating layers
    • H05K3/0017—Etching of the substrate by chemical or physical means
    • H05K3/0026—Etching of the substrate by chemical or physical means by laser ablation
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/0085—Apparatus for treatments of printed circuits with liquids not provided for in groups H05K3/02 - H05K3/46; conveyors and holding means therefor
    • H05K3/0088—Apparatus for treatments of printed circuits with liquids not provided for in groups H05K3/02 - H05K3/46; conveyors and holding means therefor for treatment of holes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
    • H05K3/12—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns
    • H05K3/1216—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns by screen printing or stencil printing
    • H05K3/1225—Screens or stencils; Holders therefor

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laser Beam Processing (AREA)

Abstract

The present invention relates to a device for fixing a frame for a metal mask. More specifically, the device for fixing a frame for a metal mask enables a metal mask to be processed more easily and conveniently by enabling the use of a laser processing apparatus regardless of the structure of a frame and a metal mask film to ease inconvenience of processing the metal mask film while replacing a fixing device in accordance with the structure of the frame and the metal mask film to be fixed to and installed on the laser processing apparatus so as to process a mounting hole for mounting a chip thereon. According to the present invention, the device for fixing a frame for a metal mask includes: a body unit including a fixing plate fixed to the laser processing apparatus, a support supporting the frame, and a gap maintaining plate connected to the fixing plate and the frame in an integrated or separable manner; a bracket fixated to and installed in the body unit; a connection link which is installed on the bracket and rotates around hinges; an operation lever member which is connected to the connection link to rotate around the hinges, and has an end connected to a pressurizing unit; and the pressurizing unit which is connected to the operation lever member to clamp and release the frame by rotating.

Description

Technical Field [0001] The present invention relates to a metal mask,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a metal mask frame fixing apparatus, and more particularly, to a metal mask film fixing apparatus for fixing a mounting hole for mounting a chip current to a laser machining apparatus, The metal mask film is fixed so as to solve the inconvenience of processing the mask film, and the metal mask film can be processed more easily and simply by using the laser machining apparatus regardless of the structure of the frame ≪ / RTI >

The size and complexity of conventional electronic assemblies are steadily increasing, and how they can be effectively soldered and assembled can lead to quality and reliability.

In recent years, portable telephones, notebook computers, PDAs, and the like, which are in the spotlight in recent years, have a flat panel display regardless of their sizes.

Conventionally, in order to perform soldering to a printed circuit board (PCB), a flexible printed circuit board (FPCB), or an FCOF, a solder cream is applied onto the substrate or film using a screen printing machine.

The metal mask is also referred to as a so-called stencil mask. The metal mask film is fixed to a laser processing machine to process mounting holes for mounting chips such as resistors, transistors, capacitors, etc., There is a method of using the metal thin film itself and a method of using a metal thin film in which a film is fixed to a frame as shown in FIG.

1, a metal thin film metal film 100 having a plurality of fixing holes 110 formed at regular intervals for machining a mounting hole is mounted on a laser processing machine using a separate fixing device 2, the film 100 of the thin metal film, which is not provided with the fixing holes 110, is fixed to the frame 200, When a hole for drilling a hole is to be drilled, a separate fixing device for fixing the film 100 having the structure of FIG. 1 is removed, and a dedicated fixing device for fixing the film-attached frame 200 to the laser processing machine is exchanged A mounting hole was machined.

Therefore, when a film having a structure is to be machined as shown in FIGS. 1 and 2 in a laser machining apparatus for drilling a hole for mounting, it is necessary to repeatedly fire and detach a fixing device for each film structure There is an inconvenience.

Also, if a fixing device for fixing the film shown in FIG. 1 is installed, it is impossible to fix the film fixed on the frame as shown in FIG.

Another problem is that two fixing devices must be used in the laser processing machine, which causes inconvenience in storage and deterioration of working efficiency.

Korean Patent Publication No. 2014-35158. Korea Patent Publication No. 2010-41865. Korean Patent Publication No. 2007-101755. German Published Patent Application No. 2005-054225 A1.

An object of the present invention is to provide a metal mask film which is fixed to a laser processing machine for machining a mounting hole for mounting chips, and a metal mask film A metal mask film and a frame fixing device for a metal mask are provided so that a laser machining apparatus can be used irrespective of the structure of the frame so that the metal mask film can be processed more simply and simply .

Another object of the present invention is to provide an apparatus and a method for adjusting a clamping force according to the thickness of a frame, by which the origin can be automatically adjusted by the stopper when the frame is mounted on the fixing device of the present invention, And it is possible to uniformly adjust the clamping force to be clamped through fine adjustment if a clearance is generated due to a machining error of the frame after clamping.

According to an aspect of the present invention, there is provided a laser processing apparatus, comprising: a fixing plate fixed to a laser processing apparatus; a pedestal supporting the frame; a body including a fixing plate and a spacing plate connected to the frame; A bracket fixed to the body portion; A connection link installed on the bracket and hinged; An operation lever member connected to the connection link so as to rotate in a hinge and having one end connected to the pressing portion; And a pressing portion connected to the operating lever member and rotated to clamp and release the frame.

The bracket includes a fixed plate portion fixed to the body, a vertical bent plate portion having an operating lever member and a shaft hole through which the pressing portion rotates hinge, and a concave space portion formed between the shaft hole formed in the vertical bent plate portion and the shaft hole The present invention is also directed to a metal mask frame fixing apparatus.

The pressing portion includes a pressing lever hinged to the operating lever member and rotatably mounted on the bracket, a height adjusting rod provided at one end of the pressing lever, a nut member engaged with the height adjusting rod, and a rubber member fixed to one end of the height adjusting rod. The present invention is also directed to a metal mask frame fixing apparatus.

And a stopper for holding the origin of the frame when the frame having the film is mounted on the laser processing apparatus is further provided on the body portion.

Wherein the pedestal is further provided with a fine height adjusting unit for finely adjusting a height of the frame.

Wherein the fine height adjusting unit comprises a height adjusting bolt member formed in a through hole of a pedestal formed on an inner circumferential surface of the screw portion and a fixing bolt orthogonal to the bolt member to fix the height adjusting bolt member while preventing the bolt member from flowing. Is achieved by a frame fixing device.

And a horizontal position adjusting member provided between the pressing lever and the nut member engaged with the height adjusting rod to adjust the horizontal position of the height adjusting rod.

According to the present invention, there is provided a metal mask film which is fixedly mounted on a laser machining apparatus for machining a mounting hole for mounting chips, and an inconvenience of processing a metal mask film while changing the fixing apparatus according to the structure of the frame. It is easy to use the laser machining apparatus irrespective of the structure of the metal mask film and the frame, and the convenience of automatically adjusting the origin by the stopper when the frame equipped with the film is mounted on the laser machining apparatus, The clamping force for clamping according to the thickness can be easily controlled and convenience for easily adjusting the clamping force to be clamped through fine adjustment if a clearance is generated due to a machining error of the frame after clamping is a very useful invention.

1 and 2 are perspective views showing a mounting structure of a metal mask film installed in a general laser processing machine.
FIG. 3A is a perspective view showing a structure of a frame fixing device for a metal mask to which the technique of the present invention is applied; FIG.
3B is a side sectional view showing the structure of a frame fixing device for a metal mask to which the technique of the present invention is applied;
4A is a perspective view showing a structure of an operation lever member which is a substantial part of the present invention.
4B is a perspective view showing a structure of a bracket which is a main part of the present invention;
4C is a perspective view showing a structure of a pressing portion which is a main part of the present invention.
5A is a side cross-sectional view showing a state before the operation of the frame fixing device for a metal mask according to the present invention.
FIG. 5B is a side cross-sectional view showing the state after the operation of the frame fixing device for metal mask of the present invention. FIG.
FIG. 6 is an exemplary view showing a method of adjusting the clamping force of a pressing portion which is a substantial portion of a frame fixing device for a metal mask according to the present invention. FIG.
FIG. 7 is an enlarged cross-sectional view showing a fine height adjusting device which is a main part of a frame fixing device for a metal mask according to the present invention. FIG.
8 is a side view showing a method of adjusting the horizontal position of the pressing portion.
FIG. 9 is a plan view showing a state where a frame equipped with a film is mounted on a metal mask frame fixing device of the present invention. FIG.
10 is a photograph showing an installation state of a frame fixing device for a metal mask according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3A is a perspective view showing a structure of a frame fixing device for a metal mask to which the technique of the present invention is applied, FIG. 3B is a side sectional view showing a structure of a frame fixing device for a metal mask to which the technique of the present invention is applied, A frame fixing device 1 for a frame is generally constituted by a body 10 fixed to a laser processing device and an operating lever member 50 and a pressing member 40 provided on the body 10 so as to rotate in a hinge.

The body 10 includes a fixing plate 11 having a plurality of fixing holes 11a to be fixed to the laser processing apparatus and a pedestal 12 supporting the frame. The fixing plate 11 and the pedestal 12 May be provided at both ends of the gap holding plate 13 in the vertical direction and the fixing plate 11 and the base 12 may be formed separately or integrally with the gap holding plate 13.

Although the pedestal 12 is described as having the same width as the spacing plate 13, the pedestal may be formed to be wider than the spacing plate 13, or a metal or synthetic resin material having a high strength may be used have.

The bracket 20 is fixed to the body 10 and the bracket 20 includes a fixing plate 21 fixed to the body 10 and an operating lever member 50 And a vertical bent plate portion 22 having a shaft hole to which the pressing member 40 is hinged are integrally formed and a concave space portion 23 is formed between the shaft hole formed in the vertical bent plate portion 22 and the shaft hole .

A connecting link 30 for rotating the hinge is connected to the operating lever member 50 and a connecting lever 30 is connected to the bracket 20 for connecting the operating lever member 50, which is hingedly connected to the connecting link 30, An operating lever member 50 to which the pressing member 40 is connected is provided.

The operating lever member 50 is provided with a hinge hole for connecting the pressing member 40 for clamping and releasing the frame mounted on the pedestal 12 integrally with the handle 51 as shown in FIG. The pressing member 40 is hinge-connected to the actuating lever member 50 as shown in FIG. 4C, and the pressing lever 40 is rotatably provided on the bracket 20 A height adjusting rod 42 provided at one end of the pressure lever 41, a nut member 43 fitted to the height adjusting rod 42, and a rubber fixed to one end of the height adjusting rod 42. [ Member (45).

4 (c) and 7 (b), it is provided between the pressing lever 41 and the nut member 43 engaged with the height adjusting rod 42, so that the right and left direction of the height adjusting rod 42, that is, And a horizontal position adjusting member 44 for horizontally adjusting the position to adjust the position.

A stopper 15 for holding the origin of the frame may be further installed on the body 10 when the frame having the film is mounted on the laser processing apparatus. Are installed on both sides of the fixing device of the present invention.

Meanwhile, as shown in FIG. 8, the pedestal 12 may be further provided with a fine height adjusting means 60 for finely adjusting the height of the frame.

The fine height adjusting means 60 includes a height adjusting bolt member 61 formed in the through hole of the pedestal 12 formed on the inner peripheral surface of the screw portion and a bolt member 61 for height adjusting bolt member 61 for preventing the height adjusting bolt member 61 from flowing, And a fixing bolt 62 provided so as to be orthogonal to the base 61.

As shown in FIG. 1, a thin film film is fixed to a laser processing apparatus, and then a film fixing apparatus 1 for metal mask according to the present invention ) Is attached to the laser processing apparatus using the fixing plate 11 as shown in FIG.

At this time, the space holding plate 13 is in close contact with the inner surface of the table of the laser processing apparatus, and the fixing plate 11 is formed with a through hole, and the bolt is inserted into the fixing hole and fixed to the laser processing apparatus.

9 and 10, the frame fixing device 1 for a metal mask is fixed to a laser machining apparatus, and then the frame is attached to a worker The frame is placed on the pedestal 12 of the installed fixing device 1 and slid on the pedestal 12 of the frame fixing device 1 for metal mask installed on the rear side to be caught by the stopper 15 to be restricted from entering.

When the frame to which the film is attached is caught by the stopper 15 and entry is restricted, reference point alignment is performed. For example, in order to explain the embodiment of the present invention, the following description will be made on the basis of providing the frame fixing device 1 for metal mask at four places. At this time, A stopper is provided on the metal mask 1 and a stopper is not provided on the near-front metal mask film fixing device 1.

This is because when the operator attaches the frame fixing device 1 for metal mask to the front side of the metal mask, it is inconvenient for the frame to be mounted after lifting the frame by being caught by the stopper when the frame is mounted on the laser machining apparatus, This is because it is inconvenient to reinstall the frame fixing device 1 for metal mask in accordance with the length of the frame, since the mounting hole can not be machined when the fixing device 1 is formed longer than the installation interval.

After confirming that the respective pedestals 12 provided at the four places are correctly raised, the operation lever member 50 rotated by the hinge as shown in FIG. And presses it downward as shown in the attached figure 5B

The vertical bent plate portion 22 of the bracket 20 fixed to the body portion 10 by the fixed plate portion 21 is rotated by rotating the knob 51 constituting the operating lever member 50 downward to be rotated substantially horizontally The connection link 30 is hinged to the concave space portion 23 side.

Since the operation lever member 50 is moved from the right to the left by a distance of L1 due to the hinge rotation of the connection link 30 while forming a radius having a length L1 toward the concave space portion 23, So that one side of the connecting rod 52 is moved to the concave space portion 23 to be drawn.

At this time, the hinge, which is the connecting portion of the operating lever member 50 and the pressing member 40, located in the concave space portion 23, escapes from the concave space portion 23 and the pressing member 40 is rotated in the L2 length direction , The pressing member (40) rotates and the end of the height adjusting rod (42) presses the frame.

The height of the height adjusting rod 42 is adjusted when the pressing force of the height adjusting rod 42 is weak or too strong and the height of the height adjusting rod 42 is adjusted when the pressing portion of the height adjusting rod 42 is not good, To adjust the position.

As shown in FIG. 6, the height adjusting rods 42 may be adjusted in height by unscrewing the nut members 43 provided on both sides of the pressing lever 41 through which the height adjusting rods 42 pass, Adjust the height of the height adjusting rod (42).

Meanwhile, as shown in FIG. 7, a method of adjusting the position of the height adjusting rod 42 includes a nut member 43 provided on both upper and lower sides of the pressing lever 41 through which the height adjusting rod 42 passes, When the tightening force of the loosening nut is released and then the height adjusting rod 42 is moved horizontally, the horizontal position adjusting member 44 installed on the upper and lower sides of the pressing lever 41 is slid and prevented from sagging.

When the height adjusting rod 42, the horizontal position adjusting member 44 and the nut member 43 are simultaneously moved, the nut member 43 is tightened. Although the rubber member 45 provided at the end of the height adjusting rod 42 is made of a rubber material, a synthetic resin material such as silicone may be used. The rubber member 45 has an effect of preventing damage to the frame and noise.

When the handle is lifted up and rotated, the operation lever member 50 is rotated by the connecting link 30 which hinges while forming a radius of L1 to the concave space portion 23, A distance of L1 is generated from left to right, so that the entire operation lever member 50 is pushed, and one side of the connecting rod 52 comes out of the concave space portion 23.

At this time, the hinge portion, which is the connecting portion of the operation lever member 50 and the pressing member 40, which is located outside the concave space portion 23, enters the concave space portion 23, so that the pressing member 40 rotates by L2 length And the pressing member 40 rotates to lift the height adjusting rod 42, thereby releasing the pressing force of the frame.

According to the present invention, there is provided a metal mask film which is fixedly mounted on a laser machining apparatus for machining a mounting hole for mounting chips, and an inconvenience of processing a metal mask film while changing the fixing apparatus according to the structure of the frame. It is easy to use the laser machining apparatus irrespective of the structure of the metal mask film and the frame, and the convenience of automatically adjusting the origin by the stopper when the frame equipped with the film is mounted on the laser machining apparatus, The pressing force for clamping according to the thickness can be easily controlled and the ease of clamping force to be clamped uniformly by fine adjustment if a clearance is generated due to a machining error of the frame after clamping.

10: Body part 11: Fixing plate
12: pedestal 13: spacing plate
20: Bracket 21: Fixing plate part
22: vertical bent plate portion 23: concave space portion
30: connecting link 40:
41: pressure lever 42: height adjustment rod
43: nut member 44: horizontal positioning member
50: operating lever member 52: connecting rod

Claims (7)

A frame fixing device for a metal mask,
A main body including a fixing plate fixed to the laser processing machine, a pedestal supporting the frame, and a spacing plate connected to the fixing plate and the frame integrally or separately;
A bracket fixed to the body portion;
A connection link installed on the bracket and hinged;
An operation lever member connected to the connection link so as to rotate in a hinge and having one end connected to the pressing portion;
And a pressing portion connected to the operating lever member and rotated to clamp and release the frame.
The method according to claim 1,
The bracket includes a fixed plate portion fixed to the body, a vertical bent plate portion having an operating lever member and a shaft hole through which the pressing portion rotates hinge, and a concave space portion formed between the shaft hole formed in the vertical bent plate portion and the shaft hole Wherein the metal mask is a metal mask.
The method according to claim 1,
The pressing portion includes a pressing lever hinged to the operating lever member and rotatably mounted on the bracket, a height adjusting rod provided at one end of the pressing lever, a nut member engaged with the height adjusting rod, and a rubber member fixed to one end of the height adjusting rod. Wherein the metal mask is fixed to the frame.
The method according to claim 1,
Wherein a stopper for holding the origin of the frame when the frame having the film attached thereto is mounted on the laser machining apparatus is further provided on the body portion.
The method according to claim 1,
Wherein the pedestal is further provided with a fine height adjusting unit for finely adjusting a height of the frame.
6. The method of claim 5,
Wherein the fine height adjusting unit comprises a height adjusting bolt member formed in a through hole of a pedestal formed on an inner circumferential surface of the screw portion and a fixing bolt orthogonal to the bolt member to fix the height adjusting bolt member while preventing the bolt member from flowing. Frame fixing device.
The method of claim 3,
And a horizontal position adjusting member provided between the pressing lever and the nut member engaged with the height adjusting rod to adjust a horizontal position of the height adjusting rod.
KR1020150089103A 2015-06-23 2015-06-23 A device for fixing frame for metal mask KR20170000195A (en)

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KR1020150089103A KR20170000195A (en) 2015-06-23 2015-06-23 A device for fixing frame for metal mask

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107957537A (en) * 2017-12-22 2018-04-24 浙江八达电子仪表有限公司 Transformer voltage-withstand test frock
CN108419374A (en) * 2018-05-18 2018-08-17 湖州旭源电气科技有限公司 A kind of pcb board automatic processing device
KR102183602B1 (en) * 2020-05-13 2020-11-26 (주)고려에스티 Jig for welding
KR20210109280A (en) * 2020-02-27 2021-09-06 삼덕기계공업주식회사 Leak test apparatus of shoe block for scarfing unit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005054225A1 (en) 2005-11-14 2007-05-16 Bernd Fromm Stencil holder for screen printing for mounting components on circuit board
KR20070101755A (en) 2004-12-09 2007-10-17 다이니폰 인사츠 가부시키가이샤 Metal mask unit, method of producing the same, method of installing metal tape, and tension application device
KR20100041865A (en) 2007-08-06 2010-04-22 에이전시 포 사이언스, 테크놀로지 앤드 리서치 Method of forming a cadmium containing nanocrystal
KR20140035158A (en) 2012-09-13 2014-03-21 박두해 Frame device of metal mask

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070101755A (en) 2004-12-09 2007-10-17 다이니폰 인사츠 가부시키가이샤 Metal mask unit, method of producing the same, method of installing metal tape, and tension application device
DE102005054225A1 (en) 2005-11-14 2007-05-16 Bernd Fromm Stencil holder for screen printing for mounting components on circuit board
KR20100041865A (en) 2007-08-06 2010-04-22 에이전시 포 사이언스, 테크놀로지 앤드 리서치 Method of forming a cadmium containing nanocrystal
KR20140035158A (en) 2012-09-13 2014-03-21 박두해 Frame device of metal mask

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107957537A (en) * 2017-12-22 2018-04-24 浙江八达电子仪表有限公司 Transformer voltage-withstand test frock
CN108419374A (en) * 2018-05-18 2018-08-17 湖州旭源电气科技有限公司 A kind of pcb board automatic processing device
KR20210109280A (en) * 2020-02-27 2021-09-06 삼덕기계공업주식회사 Leak test apparatus of shoe block for scarfing unit
KR102183602B1 (en) * 2020-05-13 2020-11-26 (주)고려에스티 Jig for welding

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