JP2002292494A - Jig for buildup welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jig for buildup welding capable of making welding region into horizontal conditions in the buildup welding for amending molds for the purpose of reusability. SOLUTION: A mold 1 is loaded and fixed in the buildup welding jig 4 of a buildup welding auxiliary means 7 and at the same time, the mold is gripped and rotated by the buildup welding auxiliary means 7 so that the horizontal conditions of the desired mold buildup welding region are maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal welding operation performed as one of measures for repairing and reusing a metal mold used for forging, casting, and sheet metal pressing. For a mold having a welded welding surface where welding work is difficult due to a corrugated shape or a stepped shape, providing a variable mold angle for obtaining a horizontal position of a desired welding operation. The present invention relates to a metal welding jig used for an auxiliary device.

[0002]

2. Description of the Related Art Generally, hot forging dies and cold forging dies,
If the casting mold, sheet metal press mold is damaged or worn,
As one of the measures for correcting and reusing the mold, there is a method in which the molded portion is returned to a predetermined shape by performing welding and further removing the molded portion.

For example, in the case of hot forging, a forged material heated to a high temperature of about 900 ° C. to 1200 ° C. comes into contact with the surface of a molding portion of a die. Immediately after molding, a mold lubricating liquid at normal temperature is applied to a molding portion of the mold for the purpose of facilitating cooling of the mold and releasing the mold from the formed product. That is, by repeatedly contacting the high-temperature forging material and the normal-temperature mold lubricating liquid, when a certain amount of molding is performed by the mold, the surface of the molded portion repeats thermal expansion and thermal contraction, and distortion occurs. Will do. In addition, the distortion may cause minute cracks, that is, heat cracks, on the surface of the molded portion of the mold, which may be fatal to the mold.

In addition, due to plastic deformation of the forged material generated during the molding by the mold, the material repeatedly flows on the surface of the molded part of the mold, and the surface of the molded part is worn and the surface condition of the mold (surface roughness). Degree) becomes coarse, leading to poor quality of the surface skin of the formed product. Further, the dimensions of the molded part change due to the wear of the surface of the molded part, and the desired shape quality of the formed product cannot be obtained.

In general, the quantity (number of lots) that can be continuously molded at one time with the same mold corresponds to the time when the above-described problem of heat crack occurs or the time when a desired formed product shape cannot be obtained due to abrasion. . The quantity from the start of molding until the molding becomes impossible continuously is referred to as mold life or mold life. The mold that has reached the mold life is recycled and reused to reduce the cost of the mold material. There is a mold correction method for returning to the initial shape of the formed portion by electric discharge machining or polishing and removal by combination thereof.

[0006] However, it is necessary that the formed portion (filled metal welded portion) that requires the welded metal at the time of mold correction be in a horizontal state in order to obtain a good welded metal welded state. In particular, in the case of a square-shaped mold used for forging, etc., since the formed part has a stepped shape or a wave shape, the metal welding work is performed in order to obtain a horizontal state of a part where the operator wants metal welding. Complicated work is required.

For example, as shown in FIG. 6 to FIG. 8, a metal table welding (1) for use in hot forging is performed on a square die (1) having a step-shaped forming portion as shown in FIG.
9) is handled manually. To use the movable table device (19), first, the mold (1) is heated to about 400 ° C. in advance. The above mold (1) is preliminarily
The reason for heating to 0 ° C. will be described. When metal welding is performed at room temperature, only the metal-welded portion locally becomes a high temperature state. Immediately thereafter, the welded metal portion is rapidly cooled, and a cooling distortion occurs in the welded metal portion, which may cause the welded metal portion to crack. About 40
Heating at 0 ° C. has the purpose of preventing the cracking phenomenon.

Next, the mold (1) is placed in the mold storage area (21) on the turntable (20) of the movable table device (19), and an operator (26) operates a switch to turn the turntable (20). ) By rotating the rotation direction (23) and the inclination direction (24) to the operator side to change the position and angle of the mold (1) visually desired by the operator (26), and to perform the welding operation for the filling metal. I do. If the inclination angle (α) is insufficient with respect to the angle desired by the operator (26), an inclusion (25) having a predetermined thickness is interposed under the mold (1), and the angle (α) is larger than the angle (α). (Β) is secured and the welding operation is performed. When the rotary table (20) is inclined, the mold (1) is prevented from sliding down by a stopper (22) fixed to the mold storage area (21).

[0009]

As described above, it is necessary for the metal welded portion at the time of mold correction to be in a horizontal state in order to obtain a good metal welded state. When the metal welding is performed while the metal welding portion of the inclined part (2) of the mold (1) is inclined, the metal capacity is larger than that of the normal metal (metal wall thickness is 20 to 30 mm). This is because the molten metal flows downward by its own weight before cooling and solidification. In addition, since the amount of flow varies depending on the inclination angle, it is not possible to obtain a uniform thickness of the ferrule and a uniform penetration depth. The penetration depth as referred to herein means a depth at which the peripheral portion of the surface of the mold in contact with the metal is melted by the heat of the metal by the metal welding. In addition, the metal welding of the inclined portion (2) to the metal welding portion (3) compensates the flow of the molten metal,
It is necessary to take a longer time than the work for welding the metal in the horizontal portion to work until the desired metal thickness is obtained. Therefore, the periphery of the metal weld (3) is exposed to heat for a longer time than other parts,
As a result, the penetration depth becomes deeper than the multiple portions. In addition, under the inclination of the metal welded portion (2), the metal flow becomes thicker than other parts due to the flow of the metal, or air is easily trapped by the flow lamination of the metal. That is, it causes a blow hole.

[0010] As described above, in the required mold quality after the mold is repaired, the welded metal to the molded part has a uniform thickness of the welded metal and a uniform penetration depth, and has no blow hole. Are listed.

[0011] The reason why the uniform metal thickness is required is that if the metal thickness is large, that is, if the build-up amount is too large, there is a removal processing allowance for removing the metal that has been metalized to a desired size or more in the subsequent process. Is to increase. Conversely, when the build-up thickness is thin, there is no processing allowance in the post-process, and the build-up skin remains, and if it is molded as it is, quality defects occur on the surface skin of the formed product.

On the other hand, the reason why a uniform penetration depth is required is that if the penetration depth is non-uniform, the part of the mold itself that is deteriorated in hardness due to the influence of heat accompanying the metal welding is non-uniform. This is because the hardened portion of the mold locally and deeply affected by heat is easily damaged by the molding load during molding.

The reason why the blow hole cannot be present inside the metal fill is that the blow hole is exposed when the metal weld is removed to a desired initial shape, resulting in a defective shape of the molded part. Also, even if you escaped the surface exposure of the blow hole,
This is because stress concentration occurs in the blowholes existing in the mold (1) during molding, and the mold (1) is more likely to be damaged starting from the blowholes.

[0014] The present invention provides a metal welding jig which allows a worker to easily secure a local level of a metal-welded portion at the time of metal-welding of a mold, and saves a great number of man-hours required for the metal-welding work. It is to reduce.

[0015]

SUMMARY OF THE INVENTION In a metal-welding auxiliary device in which a metal-welding portion of the metal mold is arranged upward by rotation of a gripping means for gripping the metal mold, the metal mold can be placed or pinched. A possible support, and at least one gripper being gripped by the gripping means and extending from the support.
Wherein the shaft portion is disposed at a position where the shaft portion substantially supports the center of gravity of the support when the mold is placed or pinched when the gripping means is rotated. Provide gold welding jigs. Thus, by using the metal welding jig, the worker can easily secure a local level of the metal welded portion at the time of metal welding of the mold.

Further, the present invention provides a metal welding jig characterized in that the support is provided with fixing means for firmly fixing the mold. Thus, the mold does not move on the support, and the welded portion of the mold can be stably welded. Further, the support has a floor portion on which the mold is placed, and two side surfaces of the mold connected to the floor portion.
And a jig for metal welding having a shaft portion connected to the outer surface of the support from the side portion and located on the same axis. Thereby, the gripping means of the metal-filled welding assisting device can reliably grip, and a shift due to the rotation of the gripping means does not easily occur.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An overlay welding jig used for an overlay welding assist device according to an embodiment of the present invention is shown in FIGS.
Explanation will be made using 0.

In this embodiment, a rectangular mold (1), which is a typical mold for hot forging, functions as a support (10) for the mold (1). ) Is rotated by using a welding jig (4) having a shaft portion for supporting the same, and a welding auxiliary device (7) having a function of holding and rotating the welding jig (4). A description will be given in the case where the metal is welded to the mold (1).

As shown in FIG. 2, the support (10) of the metal welding jig in the present embodiment has a plate-like floor (9) for mounting the mold (1) to be metal-welded. ), And plate-like members (7a, 7b, 8a, 8b) connected to the floor (9) and arranged substantially vertically so as to have a predetermined gap with the mold (1).
And a plate-like material (7
a, 8a) each have one or more bolt holes (6), so that the mold (1) can be fixed by the pressing force of bolt tightening.

On a pair of side surfaces, shaft portions (5a, 5a) for gripping by a metal welding auxiliary device (7) having gripping means.
b), and the shaft portions (5a, 5b) are provided so as to be located substantially on the same axis center line on the center of gravity when the mold (1) is placed on the support (10). I have. As shown in FIG. 2, shaft portions (5a, 5b) of the metal welding jig (4).
One has a cylindrical shape (5a) and is fixed to the side surface (7a), and the other has a cylindrical shape and a tip having a conical convex shape (5c) and is fixed to the side surface (15b). You.

Next, as shown in FIG. 4, the metal-welding assisting device (7) in this embodiment may use a device used for butt welding of two cylindrical workpieces. The chuck (12), the positioner (11) for supporting the screw chuck (12), the base (13) for holding the positioner, and the welding jig (4) for the metal welding are sandwiched therebetween. ), A pusher (1) for pressing and supporting the metal welding jig (4) from the opposite side.
4a) and a table (15) holding the pusher (14a). The pusher (14a) has a rod-shaped sliding portion (14b) and a contact portion (14c) for contacting and supporting the shaft portion (5b). The abutment (14c) has a conical recess which slides on the shaft and rotates manually about the rotation center axis, and the center of the cone is the rotation of the screw chuck (12). Located on the central axis.

Next, in this embodiment, the metal welding jig (4) on which the mold (1) is mounted is connected to the metal welding auxiliary device (7).
The operation that can be changed to the desired rotation angle of the mold by the operator will be described. The gripping means of the metal overlay assisting device (7) has a manually or automatically rotating screw chuck (12), and a shaft (5) of the metal alloy welding jig (4).
a) is fixed with a bezel. The shaft portion (5b) is pressed by the contact portion (14c) provided on the sliding portion (14b) of the pusher (14a) that rotates manually or automatically. The conical convex shape of the shaft portion (5b) is configured to fit into the conical concave shape of the contact portion (14c) with substantially no gap.

As described above, the metal welding jig (4) on which the mold (1) to be metal-welded is placed is gripped by the metal-welding auxiliary device (7), so that the metal-welding is performed. Jig (4)
Can be rotated about the substantially center of gravity axis. Therefore, as shown in FIG. 5, the worker can easily rotate the metal welding jig (4) in the Y direction in FIG.
The angle of the mold placed on the metal welding jig (4) can be easily changed.

In the above-mentioned support (10), as another example, a cage-like structure in which a floor portion and a side portion on which the mold (1) is placed is erected by a bar-like member or a beam-like member shown in FIG. This is suitable for reducing the weight.

The mounting method of the mold (1) by the pressing force of the bolt tightening shown in FIG. 3 described above uses air pressure, hydraulic pressure, or nitrogen gas pressure on the plate-like members (7a, 8a) as another example. There is a method of installing a cylinder inside and fixing the cylinder by pressing the cylinder. In addition, there is a method in which the eccentric tightening jig (34) shown in FIG. In addition, a magnet is laid on the support so that the magnet part is in contact with the mold (1) when the mold is placed, and the magnet part is attached to the mold (1).
There is a way to fix it by touching it.

As a measure for holding the mold according to the first aspect, the inner width of at least one pair of side portions of the box-shaped support is set to a predetermined press-fitting dimension with respect to the side surface of the mold. There is a method of inserting a mold into a support.

As described in the first aspect, only one shaft portion of the gripping means can be established. When the metal welding jig on which the mold (1) is mounted is lightweight, the metal welding jig is rotated in a cantilever state by the gripping means of the metal welding auxiliary device (7). The strategy holds.

In the above-mentioned shaft portion, the shaft portion may have a triangular prism shape even when the shaft portion has a triangular prism shape.
The shaft portion is not limited to a triangular prism shape, but is not limited to another polygonal shape or a key shape.

Further, the shape of the shaft of the welding auxiliary device (7) and the metal welding jig (4) may be reversed from the contact portion (14c) of the pusher (14a).

The gripping means of the metal-welding auxiliary device (7) has a method of gripping and fixing it in a key shape or the like, in addition to the shape of the claw chuck. Alternatively, the shaft of the metal welding jig may be formed in a tubular shape, and the gripping means may be formed as a push-expand type chuck.
The holding means is not limited to the embodiment.

As a second embodiment according to the present invention, a sector plate (28) shown in FIG. 9 is provided on the shaft portion (5a) of the welding metal jig.
Is installed above the shaft part, and the chuck (12)
When the jaws of the fan are loose and open, the fan-shaped plate (2
8) The side surface is held in contact with two of the nails to prevent the welding metal jig from falling.

As a third embodiment according to the present invention, as shown in FIG. 5, if a metal-welding jig (4) and the metal-welding auxiliary device (7) are used, automatic metal-welding is performed in combination with a welding machine. Becomes possible. In the method, a sequence controller is internally provided in the positioner (11) of the metal welding assist device (7), and the rotation phase of the chuck (12) is automatically operated by teaching, or the sequence-controlled welding is performed. Combine the robot (18).

First, in order to make sure that the welding robot (18) welds the horizontal portion with the metal, first, the metal welding jig (4) whose welding position is horizontal with respect to the metal welding position of the metal welding robot (14). The rotation of the chuck (9), that is, the rotation of the chuck (9) is stored in advance by teaching, and the movement of the chuck (9) and the welding robot (18) are synchronized with each other by sequence control to rely on manual work. No automatic metal welding can be possible.

[0034]

As described above, according to the present invention, even if a step-shaped or corrugated square mold is used, an operator can perform welding by using a metal-welding jig and a metal-welding auxiliary device. The inclined portion of the step-shaped or corrugated square mold can be easily made horizontal. In addition, also in the quality of the metal welding of the step-shaped or corrugated square metal mold, the metal-wall thickness and the penetration depth can be easily made uniform, and the occurrence of blow holes can be reduced.

Further, the automation eliminates the need for a complicated rotation operation of the chuck by manual operation, and greatly reduces the man-hour for the welding operation of the metal fill. Further, since the welding operation is performed by a welding machine, there is no danger that the operator's skin touches the mold heated to about 400 ° C. and burns the operator.

[Brief description of the drawings]

FIG. 1 is a perspective view of a step-shaped square mold according to the present invention.

FIG. 2 is a perspective view of a metal welding jig according to the present invention.

FIG. 3 is a perspective view showing a state in which a mold is stored in a metal welding jig according to the present invention.

FIG. 4 is a front view of the welding equipment in a state where a metal welding jig according to the present invention is held.

FIG. 5 is a side view showing a state in which a welding welding jig according to the present invention is rotated and a welding robot is filling an irregularly shaped portion.

FIG. 6 is an overall view of a filler metal welding operation in a conventional example.

FIG. 7 is an overall view showing a state in which a rotary table is inclined to an operator side in a metal welding work in a conventional example.

FIG. 8 is a top view of a rotary table in a conventional welding operation for metal filling.

FIG. 9 is a perspective view of a shaft portion with a fan-shaped plate member according to the present invention.

FIG. 10 is a perspective view of the eccentric fastening device according to the present invention.

[Explanation of symbols]

 1. . . Mold 2. . . Inclined part 3. . . Support 4. . . Metal welding jigs 5a, 5b. . . Shaft. . . Filling welding assist device 10. . . Support

Claims (3)

[Claims] 1. A filler metal welding assisting device for arranging a filler metal welding portion of a metal mold upward by rotating a gripping means for gripping the metal mold, wherein a support capable of mounting or holding the metal mold is provided. And at least one shaft portion that is gripped by the gripping means and extends from the support, and the shaft portion is configured to support or support the mold when placing or nipping the mold upon rotation of the gripping means. A metal welding jig, which is arranged at a position where the center of gravity is substantially supported. 2. The welding jig according to claim 1, wherein the support is provided with fixing means for firmly fixing the mold. 3. The support according to claim 1, wherein the support has a floor portion on which the mold is placed, and two side portions on side surfaces of the mold connected to the floor portion. A jig for metal welding, comprising a shaft portion extending from said side portion to the outer surface of the body and located on the same axis.