KR101207743B1

KR101207743B1 - Apparatus for molding

Info

Publication number: KR101207743B1
Application number: KR1020100134306A
Authority: KR
Inventors: 신점수; 한상빈; 이태오; 전효식
Original assignee: 주식회사 포스코
Priority date: 2010-12-24
Filing date: 2010-12-24
Publication date: 2012-12-03
Also published as: KR20120072524A

Abstract

Disclosed is a welding apparatus capable of controlling a lifting height of a welding member according to a thickness of a material.
The welding device is provided with a device body having a mounting base to which the material is fixed, a material thickness measuring means for measuring the thickness of the material fixed to the mounting base and the device body is welded in cooperation with each other, the material thickness It includes a welding member which is elevated according to the thickness of the material measured by the measuring means.
According to such a welding apparatus, it is possible to prevent the welding portion to which the material is welded from being eccentric by adjusting the falling height of the welding member according to the thickness of the material measured by the material thickness measuring means.

Description

Welding device {Apparatus for molding}

The present invention relates to a welding apparatus, and more particularly, to a welding apparatus for welding a workpiece in a state in which the welding member pressurizes the workpiece.

In order to use the steel material for industry, it is necessary to conduct various property evaluations and supply the material with the material that meets the optimal conditions. Especially, the characteristic about the weldability of a raw material is handled important.

In particular, in the automobile industry for welding by welding machine, the property of the weldability of the material is more important. In order to satisfy the optimum conditions suitable for the property of the material, the properties of the material are measured by various methods and conditions.

On the other hand, in order to weld the material by spot welding, the operator inputs the welding conditions into the controller of the spot welder, places the material between the electrodes composed of a pair of up and down, and then presses the operation switch of the spot welder.

Thereafter, when the moving table of the spot welder is moved to press the material to be welded to the upper electrode, current is supplied to the material. That is, when the servo motor is driven, the moving table is lowered by the driving of the servo motor, and accordingly, the upper electrode installed on the moving table is lowered to press the material to be welded. At this time, the current is energized and welding of the material is performed in connection with the lower electrode.

By the way, the material to be spot welded in this manner has a variety of thickness. However, since the lowering distance at which the upper electrode is lowered by the servomotor lowering the movable table is not controlled, when the welding of the thick material is performed, the movable table is continuously lowered even if the upper electrode is in contact with the material.

This causes a problem in that the welded portion is twisted by the pressing force applied by the movable table. That is, there is a problem that the welded portion to which the material is welded is eccentric.

In addition, the shaft is provided in the movable table, the upper electrode is connected to the shaft, the shaft and the upper electrode is coupled to the bushing coupled to the thread formed on the shaft. However, there is a problem in that the screw portion of the shaft is broken by the pressing force applied by the movable table, and the upper electrode is twisted, thereby preventing precision welding.

Due to the above problem, there is a problem that an error occurs in data of proper current range, continuous RBI, and ductility ratio which are important items for weldability evaluation.

An object of the present invention is to provide a welding device that can control the lifting height of the welding member according to the thickness of the material.

Welding apparatus according to an embodiment of the present invention is installed on the device body having a mounting material to which the material is fixed, the material thickness measuring means for measuring the thickness of the material fixed to the mounting and the device body in cooperation with each other The welding member includes a welding member which is lifted and lowered according to the thickness of the material measured by the material thickness measuring means.

The apparatus body may be provided with a lifting unit is provided with the welding member and the material thickness measuring means is elevated on the upper portion of the material.

The material thickness measuring means may include a body part installed on the lifting part and a touch bar installed on the body part so as to be liftable to contact the material.

The material thickness measuring means further includes a touch bar driving source installed in the inner space of the body part to drive the touch bar, wherein the touch bar driving source includes an encoder and the encoder controls information about the falling height of the touch bar. The control unit may calculate the thickness of the material by sending it out.

The lifting unit may include a welding member lifting means connected to the welding member to lift the welding member.

The welding member elevating means includes a welding member driving source for generating a driving force for elevating the welding member, a power transmission member connected to the welding member driving source and being elevated, and one end is mounted to the power transmission member and the welding member at the other end thereof. It may have a connection member is installed.

The power transmission member is provided with a rotating bar which is formed while the thread of the ball screw is rotated to move up and down, a bearing portion rotatably installed on one side, and an extension bar fixedly fixed to the other side of the bearing portion, the extension The bar has a convex portion formed to reinforce the strength against the compressive load generated when the welding member presses the material, and the extension bar and the connection member may be connected by a cylindrical bushing.

The power transmission member is provided with a rotating bar that is formed by the screw thread of the ball screw is rotated while lifting, a bearing portion rotatably installed on one side of the rotating bar, and an extension bar fixedly fixed to the other side of the bearing portion, the extension bar A convex portion is formed to reinforce the strength of the compressive load generated when the welding member presses the material, and the extension bar and the connection member may be connected by a cylindrical bushing.

According to the present invention, by adjusting the falling height of the welding member according to the thickness of the material measured by the material thickness measuring means there is an effect that can prevent the welded portion welded to the material.

In addition, by adjusting the lowering height of the welding member in accordance with the thickness of the raw material there is an effect that can be prevented from being damaged by the pressing force of the connection member of the connection member and the power transmission member, that is, the screw connected by the bushing is installed. .

In addition, it is possible to reinforce the strength of the power transmission member by the convex portion formed in the extension bar of the power transmission member, and the connection member and the power transmission member are connected by the cylindrical bushing, thereby preventing damage to the screw portion.

1 is a schematic structural view of the welding apparatus according to an embodiment of the present invention as viewed from the side.
Figure 2 is a schematic configuration view of the welding apparatus according to an embodiment of the present invention as viewed from the front.
Figure 3 is a schematic block diagram showing a welding member lifting means according to an embodiment of the present invention.
4 to 6 are operation explanatory diagrams for explaining the operation of the welding apparatus according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments which fall within the scope of the inventive concept may be easily suggested, but are also included within the scope of the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a schematic configuration view of the welding apparatus according to an embodiment of the present invention from the side, Figure 2 is a schematic configuration view of the welding apparatus according to an embodiment of the present invention from the front, Figure 3 is a view of the present invention A schematic block diagram showing a welding member lifting means according to an embodiment.

1 to 3, the welding device 100 according to an embodiment of the present invention includes a device body 120, material thickness measuring means 140, a welding member 160 and the controller 180 Can be configured.

The device body 120 may include a mounting table 122 to which the material S is fixed. Mounting table 122 may be disposed in the central portion of the device body 120, it may be composed of a fixing jig to be fixed to the material (S) to be welded.

In addition, the device body 120 is provided with a material thickness measuring means 140 and the welding member 160, it may be provided with a lifting unit 124 to be elevated in the upper portion of the material (S).

In addition, the elevating unit 124 may be connected to an elevating unit driving source (not shown) for elevating driving. Then, the lifting unit driving source lowers the lifting unit 124 from the base position and lowers the lifting unit 124 to a position where the welding member 160 is disposed at a predetermined distance apart from the material S.

On the other hand, the lifting unit driving source may be formed of a cylinder or a motor for generating a driving force for lowering the lifting unit 124.

In addition, the lifting unit 124 may be provided with a welding member lifting means 130 that is connected to the welding member 160 to elevate the welding member 160.

The welding member lifting means 130 may include a welding member driving source 132, a gear box 134, a power transmission member 136, and a connection member 138.

The welding member drive source 132 generates a driving force for elevating the welding member 160. In addition, the welding member driving source 132 may be formed of a stepping motor to control the height of the welding member 160 falling. In addition, the welding member drive source 132 is connected to the controller 180 is controlled by the controller 180 according to the thickness of the material (S) measured by the material thickness measuring means 140 to lower the welding member 160. .

On the other hand, the power transmission member 136 is connected to the welding member drive source 132 is elevated. That is, the power transmission member 126 may be connected to the welding member driving source 132 through a gear box 134 in which the rotating shaft of the welding member driving source 132 is mounted and a plurality of gears are installed.

On the other hand, the gear box 134 may be provided with a gear 134b having a female screw portion 134a of the ball screw.

In addition, the power transmission member 136 may include a rotation bar 136a, a bearing portion 136b, and an extension bar 136c.

Rotating bar 136a may be formed with a thread (136d) of the ball screw on the upper side. That is, the thread 136d formed on the rotation bar 136a is coupled to the gear 134b having the female thread part 134a provided in the gear box 134, and the rotation bar 136a is rotated when the gear 134b is rotated. It is lifted while rotating in conjunction with this.

The rotating bar 136a is rotatably installed on the bearing part 136b, and the bearing part 136b is also raised and lowered by the lifting of the rotating bar 136a.

On the other hand, an elastic member 136e may be installed between the rotating bar 136a and the bearing portion 136b, so that the thread 136d of the ball screw formed on the rotating bar 136a is damaged by the pressing force or the gear The separation from the female screw portion 134a provided in the box 134 can be prevented.

In addition, the extension bar 136c is fixed to the bearing portion 136b. On the other hand, the extension bar 136c may be provided with a convex portion 136f to reinforce the strength of the compressive load generated when the welding member 160 presses the material.

And, the end of the extension bar 136c may be provided with a screw portion (136g) for coupling with the connection member 138.

On the other hand, the extension bar 136c and the connecting member 138 are connected by a cylindrical bushing 137. That is, the bushing 137 has a cylindrical shape to prevent breakage of the threaded portion 136g formed in the extension portion 136c. Accordingly, the contact area between the bushing 137 and the extension bar 136c is increased and applied. Since the load can be distributed to a larger area, it is possible to prevent the screw portion 136g from being damaged by the applied load.

One end of the connection member 138 is mounted to the power transmission member 136 and the other end of the welding member 160 is installed. That is, one end of the connection member 1380 is coupled to the extension bar 136c of the power transmission member 136 through the bushing 137, and the welding member 160 is fixedly installed at the other end.

On the other hand, the connection member 138 may be disposed in the center of the lifting unit 124.

In addition, the device body 120 may include a fixing part 126 on which any one of the welding members 160 is installed. The fixing part 126 is installed on the device body 120 to be disposed below the device body 120, and the welding member 160 mounted on the fixing part 126 is fixed to the mounting table 122. Is in contact with the bottom of the.

The material thickness measuring unit 140 measures the thickness of the material S fixed to the mounting table 122. Meanwhile, the material thickness measuring unit 140 may include a body 142, a touch bar 144, and a touch bar driving source 146.

Body portion 142 is fixed to the lifting unit 124, and has an internal space so that the touch bar drive source 146 can be installed.

In addition, the touch bar 144 is installed to be liftable on the body 142 to be in contact with the material (S).

On the other hand, the end of the touch bar 144 may be provided with a touch sensor 144a for generating a signal when contacting the material (S). In addition, the touch bar 144 is connected to the control unit 180, and when the touch bar 144 is lowered to contact the material (S), the touch sensor 144a transmits a signal for this to the control unit 180.

The touch bar driving source 146 is installed inside the body 142 to drive the touch bar 144 up and down. In addition, an encoder (not shown) is provided at the touch bar driving source 146, and the encoder transmits information about a falling height of the touch bar 144 to the controller 180.

Hereinafter, the operation of the material thickness measuring means 140 will be described. First, the touch bar driving source 146 is driven to start the lowering of the touch bar 144. The lowering of the touch bar 144 continues until the touch sensor 144a provided on the touch bar 144 contacts the material S.

Thereafter, when the touch sensor 144a contacts the material S and a signal is transmitted to the controller 180, the controller 180 controls the touch bar driving source 146 to raise the touch bar 144.

On the other hand, the controller 180 calculates the falling height of the touch bar 144 through the signal from the encoder provided in the touch bar driving source 146, and calculates the thickness of the material (S) from this.

The welding member 160 is installed in the apparatus main body 120 to cooperate with each other to weld the raw material S, and is lifted according to the thickness of the raw material S measured by the material thickness measuring unit 140.

That is, the welding member 160 may include an upper welding member 162 installed on the lifting unit 124 and a lower welding member 164 installed on the fixing unit 126.

On the other hand, the upper welding member 162 is connected to the lifting member 130, the lifting member 130 is provided in the lifting unit 124, the lower welding member 164 is the bottom surface of the material (S) fixed to the mounting table 122 It is fixed to the fixing portion 126 to be in contact with.

As described in more detail above, the upper welding member 162 is fixedly installed on the connection member 138, and is elevated in conjunction with the power transmission member 136 in accordance with the elevation of the power transmission member 136.

In addition, the upper welding member 162 is elevated by the welding member driving source 132 connected to the control unit 180, the control unit 180 controls the welding member driving source 132 to the upper welding member 162 to the material (S ) And descend according to the thickness.

The controller 180 controls the falling height of the upper welding member 162 according to the thickness of the raw material S measured by the raw material thickness measuring unit 140.

That is, the controller 180 is connected to the touch sensor 144a provided in the touch bar 144 of the material thickness measuring unit 140, the touch bar driving source 146, and the encoder provided in the touch bar driving source 146. do.

When the signal is transmitted from the touch sensor 144a, the falling height of the touch bar 144 is calculated through the signal from the encoder. From this, the controller 180 calculates the thickness of the material (S).

In addition, the controller 180 is connected to the welding member drive source 132 of the welding member lifting means 130, and controls the welding member drive source 132 according to the calculated thickness of the material (S) to the welding member 160 The falling height of the upper welding member 162 is controlled.

As described above, the material S is welded by adjusting the falling height of the upper welding member 160 constituting the welding member 160 according to the thickness of the material S measured by the material thickness measuring means 140. It is possible to prevent the weld portion from being eccentric.

That is, the welding is performed by lowering the upper welding member 160 to prevent excessive pressure from being applied to the upper welding member 160 constituting the welding member 160 according to the thickness of the raw material S. Can be prevented from being eccentric.

In addition, the connection member 138 and the power transmission member 136 to which the upper welding member 162 constituting the welding member 160 is coupled by adjusting the lowering height of the welding member 160 according to the thickness of the material S. It is possible to prevent the connection portion of, i.e., the screw portion 136f connected by the bushing 137, to be broken by the pressing force.

In addition, it is possible to reinforce the strength of the power transmission member 136 by the convex portion 136d formed on the extension bar 136c of the power transmission member 136, and the connecting member 138 by the cylindrical bushing 137. And the power transmission member 136 can be prevented from being damaged by the screw portion 136f.

Hereinafter, with reference to the drawings will be described the operation of the welding apparatus according to an embodiment of the present invention.

4 to 6 are operation explanatory diagrams for explaining the operation of the welding apparatus according to an embodiment of the present invention.

First, referring to FIG. 4, when the material S is fixedly installed on the mounting table 122, the lifting unit 124 is lowered by a predetermined height from the base position. At this time, the upper welding member 162 constituting the welding member 160 is disposed spaced apart from the material (S) by a predetermined distance, the lower welding member 160 supports the bottom surface of the material (S).

Then, as shown in Figure 5, the touch bar 144 of the material thickness measuring means 140 is lowered. The lowering of the touch bar 144 continues until the touch sensor 144a provided at the end of the touch bar 144 contacts the material S.

Meanwhile, when a signal is transmitted from the touch sensor 144a to the controller 180, the controller 144a controls the touch bar driving source 146 to raise the touch bar 144. At the same time, the controller 144a calculates the falling height of the touch bar 144 through a signal from an encoder connected to the touch bar driving source 146 to calculate the thickness of the material S.

Thereafter, as shown in FIG. 6, the controller 180 controls the welding member driving source 132 of the welding member lifting means 130 to adjust the height of the upper welding member 162 to match the thickness of the material S. FIG. To control.

Accordingly, since excessive pressing force may not be applied when welding the raw material S, it is possible to prevent the welding part to which the raw material S is welded from being eccentric.

100: welding device 120: device body
140: material thickness measuring device 160: welding member
180:

Claims

An apparatus body having a mounting table on which a material is fixed;
Material thickness measuring means for measuring the thickness of the material fixed to the mounting table; And
A welding member installed in the apparatus body to weld the material in cooperation with each other, and to be elevated according to the thickness of the material measured by the material thickness measuring means;
Welding apparatus comprising a.

According to claim 1, wherein the device body
The welding device and the material thickness measuring means is installed and the welding device, characterized in that it comprises a lifting unit which is lifted from the upper portion.

The method of claim 2,
The material thickness measuring means is a welding device, characterized in that it comprises a body portion which is installed in the elevating portion, and the touch bar is provided so as to be liftable to the body portion in contact with the material.

According to claim 3, wherein the material thickness measuring means
It is provided in the inner space of the body portion further comprises a touch bar drive source for driving the touch bar,
The touch bar drive source is provided with an encoder, the encoder sends information on the height of the falling of the touch bar to the control unit, characterized in that the control unit calculates the thickness of the material.

The method of claim 2, wherein the lifting unit
And a welding member elevating means connected to the welding member to elevate the welding member.

According to claim 5, The welding member lifting means
A welding member driving source for generating a driving force for elevating the welding member;
A power transmission member connected to the welding member driving source and lifted up and down; And
A connection member having one end mounted to the power transmission member and the welding member installed at the other end;
Welding apparatus characterized in that it comprises a.

The method according to claim 6,
The power transmission member is provided with a rotating bar that is formed while the screw thread of the ball screw is rotated and raised, a bearing portion rotatably installed on one side, and an extension bar fixedly fixed to the other side of the bearing portion,
The extension bar is formed with a convex portion to reinforce the strength against the compressive load generated when the welding member presses the material,
And the extension bar and the connection member are connected by a cylindrical bushing.

The method according to claim 6,
The welding member drive source is connected to the control unit and the welding device, characterized in that the control unit controls the welding member drive source to adjust the height of the falling of the welding member in accordance with the calculated thickness of the material.