JPH0394996A - Clamping device of welding machine - Google Patents

Abstract

PURPOSE:To obtain an optimum of welding finished state by supporting axially one end of a link device bearing part on a link plate rear end part, fixing the other end to an end part of an elastic member, obstructing an advance movement of a support plate against an advance movement of the link plate and supporting axially the bearing part so as to be turnable in the reverse direction. CONSTITUTION:At the time of welding a work flange placed on the upper face of the tip part of a clamp piece 45, a work part is supported by a support plate 55. One end of an elastic member (plate spring) 57 is fixed to the support plate 55. One end of a link device bearing part 63 is supported axially by a link plate 61 rear end part, and the other end is fixed to the other end of the elastic member 57. An advance movement of the support plate 55 is obstructed against an advance movement of the link plate 61 and the bearing part 63 is supported axially so as to be turnable in the reverse direction. In such a way, a welding distortion can be decreased.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a welding machine, particularly a vertical welding machine, for welding a workpiece (
The present invention relates to a clamping device for clamping a workpiece (workpiece), and more particularly to a clamping device for a welding machine equipped with a support plate that is an attachment that is brought into contact with a flange portion of a workpiece during welding.

(Prior Art) Conventionally, in a welding machine, especially a vertical welding machine, in order to perform welding processing on a workpiece, a clamp frame of a clamp device is provided on the frame so as to be movable in the front-rear direction and the vertical direction, and a clamp piece is provided. A clamp holder is provided between the clamp frame and the clamp holder, and a clamp force adjusting member is provided between the clamp frame and the clamp holder to absorb the deflection of the clamp holder and uniformly support the clamp force, and the The clamping force during clamping can be adjusted, and it is possible to perform corner welding or flat butt welding on the workpiece.

(Problem to be Solved by the Invention) By the way, when using such a clamp device to weld the flange portion of the workpiece, there is no support member to support the flange portion, and the welded portion (bead) falls down and becomes dented. Even if the dents are sanded, the dents remain in the product, which impairs its aesthetic appearance. In addition, there was a problem in that there was no coolant to absorb welding heat, so welding distortion occurred in the flange, and this welding distortion caused a step in the flange.

SUMMARY OF THE INVENTION An object of the present invention is to provide a clamping device for a welding machine that can optimize the bead portion and welding distortion when welding a flange portion, in order to improve the above-mentioned problems.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention includes a clamp frame of a clamp device that is provided on the frame so as to be movable in the front and rear directions and the vertical direction. A clamp holder is provided between the crank frame and the crank holder, and a clamp force adjustment member is provided between the crank frame and the crank holder to absorb the deflection of the clamp holder and uniformly support the clamp force, and is placed on the upper surface of the tip of the clamp piece. a sabot plate that supports the flange portion of the work when welding the work, and an elastic member having one end fixed to the support plate;
A link plate whose distal end is movable in an elongated hole provided in the clamp bead as the clamp frame moves in the forward direction; one end is pivotally supported by the rear end of the link plate, and the other end is supported by the elastic member. a bearing fixed to an end and pivotally supported to prevent movement of the support plate in response to forward movement of the link plate and to be rotatable in the opposite direction; the support plate is raised from the upper surface of the clamp piece; This is a clamp device for a welding machine, characterized in that it is equipped with a link device that allows the welding machine to move.

(Function) By adopting the clamp device of the welding machine of the present invention,
When welding the workpiece, a support plate that supports the flange portion is placed on the upper surface of the tip of the clamp piece, one end of the elastic member is fixed to the support plate, and the tip of the link plate of the link device is provided on the clamp piece. The clamp frame can be moved in the forward direction in the elongated hole, and one end of the bearing part of the link device is pivotally supported by the rear end of the link plate, and the other end is supported by the other end of the elastic member. The movement of the support plate is prevented with respect to the forward movement of the link plate, and the support plate is pivotally supported so as to be rotatable in the opposite direction. As an attachment during flange welding, the support plate supports the bead from below and prevents the formation of a concave area where the bead sag, absorbs welding heat from the bead, reduces welding distortion, and supports the flange. It is possible to finish the weld in an optimal state without deformation.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIG. 9, vertical automatic welding machine 1 as a welding machine
A table 5 for placing a workpiece is provided on the front upper surface of a box-shaped frame 3. A support member 9 is provided in a groove 7 formed in the frame 3 on the rear side of the table 5, and molds 11A and 11B for backing the workpiece are rotatably supported on this support member 9. has been done. That is, when performing corner welding on the workpiece, the backing mold 11A. 11B rotates relatively, and the backing mold 11
The angles of A and IIB are positioned at 90 degrees. In addition, when performing flat butt welding on the workpiece, the backing mold 1
1A. 1.1B is rotated relatively, and the backing mold 11A is
, IIB are positioned at an angle of 180 degrees.

A support column 13 is erected on the rear part of the frame 3, and a vertical automatic welding machine 1 is connected to the left side of the support column 13 via a bracket 15.
A control panel 17 is installed to control the.

At the front of the support column 13, there are
An x-, y-, and z-axis unit 19 is attached that is movable in the axial direction (front-back direction) and the Z-axis direction (up-down direction). A torch 21 for welding a work is attached to the front of one of the x, y, and z axes units.

An L-shaped support frame 23 is provided at the front left side of the support column 13, and a clamp device 25 that is movable in the Y and Z axis directions is provided at the tip of the support frame 23, as shown in FIG. As shown in the figure, a plurality of Y-axis guides 2 extending in the Y-axis direction are provided at the tip of the support frame 23.
7 is provided. Furthermore, two clamp cylinders are provided within the tip end of the support frame 23.

A U-shaped guide member 31 is attached to the Y-axis guide 27, and a block 33 is attached to this guide member 31. A Z-axis guide 35 extending in the Z-axis direction is attached to this support block 33, and a Z-axis cylinder 3 is attached to the support block 33.
7 is provided, and the Z-axis guide 37 is provided with a clamp unit 39.

The three clamp units include a clamp frame 41, a clamp holder 43, a plurality of clamp pieces 45, and the like. More specifically, as shown in FIGS. 1 and 2, a clamp holder 43 is installed within the clamp frame 41, and within the clamp holder 43, a plurality of clamp pieces 45 are arranged in multiple stages in two axial directions. The number of clamp pieces 45 is selected depending on the length of the workpiece.

Note that 47 is a fixed clamp piece. (See FIGS. 6 to 8) As shown in FIGS. 1 to 4, the clamp force adjustment member 53, which is an air tube in this embodiment, is installed between the clamp frame 41 and the clamp holder 43. By the air force supplied into the air tube 53, the deflection of the clamp holder 43 is absorbed and a uniform clamping force is applied to the workpiece.

Further, a support plate 55 is placed on the upper surface of the tip of the clamp piece 45, and supports the flange portion 51 of the workpiece from below when welding the flange portion 51 of the workpiece.

Note that the support plate 55 is fixed to one end of an elastic member 57, which is a leaf spring in this embodiment, with a mounting screw 73.

The five link devices include a full rear end 65 of the clamp piece 45.
It is housed inside and mainly consists of a link plate 61 and a bearing part 63. The link plate 61 is provided such that its six tip end shaft bodies are movable within an elongated hole 67 provided in the clamp piece 45 as the clamp frame 41 moves in the forward direction (Y-axis direction). Further, one end of the bearing portion 63 is pivotally supported by the rear end shaft body 71 of the link plate 61, and the other end is held by a mounting screw 81 on a bearing stand 77 placed in the rear end groove portion 65. The leaf spring 57 is rotatably supported by a shaft body 79, and the other end of the leaf spring 57 is fixed with a fixing screw 75.

For example, as shown in FIGS. 6 to 7, the movement of the support plate 55 is blocked by the flange portion 51 of the workpiece with respect to the forward movement of the link plate 61 in the Y-axis direction. As shown in the figure, the bearing portion 63 is rotatably supported by the rear end shaft 71 so as to be rotatable in the opposite direction. By this reverse rotation of the support part 63, the support plate 5
5 rises from the upper surface of the clamp piece 45 via a leaf spring 57, and the support plate 55 connects the flange portion 51 with the leaf spring 5 from below as an attachment during flange welding.
For example, the sheet material 83 can be set in advance and automatically welded with the torch 21 while supporting the sheet material 83 with elasticity of 7. The peed portion formed by such a support plate 55 absorbs this welding heat and cools it down without sagging downward, thereby preventing the occurrence of welding distortion and making it possible to finish in an optimal state. .

Note that the present invention is not limited to the above-mentioned embodiments,
By making appropriate changes, other embodiments can be implemented.

(Effects of the Invention) As already clear from the above description, in the clamp device of the welding machine of the present invention, a support plate that supports the flange portion is placed on the top surface of the tip of the clamp piece when welding the workpiece. , one end of the elastic member is fixed to a support plate, a tip end of a link plate of the link device is movable in an elongated hole provided in the clamp bead by movement of the clamp frame in the forward direction, and a bearing of the link device One end of the part is pivotally supported by the rear end of the link plate, and the other end is fixed to the other end of the elastic member, so that the support plate is prevented from moving in the opposite direction with respect to the forward movement of the link plate. Since it is rotatably supported, the support plate rises from the upper surface of the clamp bead by rotation of the shaft support, and the support plate supports the bead part from below and lowers it as an attachment when welding the flange of the workpiece. This prevents the weld from dripping, cools the bead, reduces welding distortion, eliminates deformation of the flange, and allows the weld to be finished in an optimal welding state.

[Brief explanation of drawings]

1 to 5 represent the main parts of the embodiment of the present invention,
Fig. 1 is a plan view of the clamp unit in the clamp device, Fig. 2 is a cross-sectional view of Fig. 1, Fig. 3 is a cross-sectional view of Fig. 2, and Fig. 4 is the same <IV-■. 5 is a diagram of the support plate rising as the clamp unit moves forward, Figure 6 is an explanatory diagram of the clamp unit in the standby state, Figure 7 is an explanatory diagram of the clamp unit in the forward state, and Figure 8 is the support plate. An explanatory diagram of the raised state of the plate and the welding state, FIG. 9 is a perspective view of a vertical automatic welding machine in which the present invention is implemented, and FIG. 10 is an enlarged view of the clamping device, which is the section viewed from the X arrow shown in FIG. 9. It is. 1... Vertical automatic welding machine 23... Support frame 25... Three clamp devices... Clamp unit 41... Clamp frame 43... Clamp holder 45... Clamp bead 51... Work flange section 53...Air tube 55...Support plate 57...Five leaf springs...Link mechanism 61...Link plate 63...Bearing section 67...Elongated hole allowance Person

Claims (1)

[Claims] (1) A clamp holder equipped with a clamp piece attached to a clamp frame of a clamp device that is movably provided on the frame in the front-rear direction and up-down direction, and the clamp holder having a deflection between the clamp frame and the crank holder. a clamping force adjustment member that absorbs and supports the clamping force uniformly; a support plate that is placed on the upper surface of the tip of the clamp piece and supports the flange portion of the workpiece when welding the workpiece; and a support plate that supports the flange of the workpiece when the workpiece is welded; an elastic member fixed to a plate; a link plate whose distal end is movable in an elongated hole provided in the clamp piece as the clamp frame moves in the forward direction; and one end pivoted to the rear end of the link plate. and a bearing portion whose other end fixes the other end of the elastic member and is pivotally supported so as to be rotatable in a reverse direction so that movement of the support plate is prevented with respect to forward movement of the link plate. and a link device for lifting the clamp piece from the upper surface of the clamp piece.