JPH0570560B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a welding workpiece support table used for welding a welding workpiece having a flat bottom or the like placed on a table. .

(Prior Art) In a conventional workpiece support stand, the workpiece to be welded is placed directly on a flat table surface.

(Problems to be Solved by the Invention) However, when welding the workpiece using the conventional weldwork support stand, the workpiece W is moved to the table 15' by the welding heat generated during welding. Since the weld warps in a convex manner (see Fig. 5), there is a problem in that the stability of the welded object deteriorates and the welding position becomes misaligned. Furthermore, since the workpiece and the table are in contact over a wide area, heat propagated from the workpiece causes various parts of the workpiece support to reach high temperatures, which has an adverse effect on parts such as bearings.

(Means for Solving the Problems) In order to solve the above problems, the present invention has the following configuration. That is, in the welding object support stand according to the present invention, on the table surface serving as the base, a protruding support member that contacts and supports the bottom surface of the welded object is arranged approximately along the weld line. It is characterized by

(Function) In the workpiece support table according to the present invention, the workpiece to be welded is mainly supported by the protruding receiving material, and the table surface and the workpiece do not come into direct contact over a wide area.

(Example) Fig. 1 is a sectional view of a welding device using an example of the workpiece support according to the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a front view of the welding device, and Fig. 4 is a FIG. 3 is a plan view of a weldment workpiece support; This welding device 1 is
A workpiece support 2 and a welding head support device 3 are provided, and a welding head 4 is supported by the welding head support device 3. In the figure, 6 and 7 are the objects to be welded, which are a square steel pipe and a square steel plate for a flange, and 8
is the backing money. A method for fixing the square steel plate 7 will be described later.

The workpiece support stand 2 includes a base part 2a installed on the floor and a rotating part 2b rotatable with respect to the base part 2a. The base portion 2a includes a bearing sleeve 10
is fixed onto the base 12 with a set bolt 11. On the other hand, in the rotating part 2b, a table 15 is integrally attached to the upper end of the shaft 14 with a mounting bolt 18. The shaft 14 is rotatably supported in the bearing sleeve 10 by radial bearings 18, 19 and a thrust bearing 20 in a horizontal plane. In addition, the shaft 14
A lower end portion of the rotary encoder 23 is connected to a rotary encoder 23 via a shaft coupling 22 . The rotary encoder 23 has the role of detecting the amount of rotation of the shaft 14 and controlling the welding, and is connected to a preset counter (not shown), and when welding is performed by the angle determined by the preset counter, The rotation of the drive roller and welding are automatically stopped. Further, the lower end of the shaft 14 is connected via a rotary ground 26 to a ground wire 25 taken out from a hole 24 provided in the side wall of the bearing sleeve 10 .

The table 15 has protrusions 15b that are trapezoidal in plan view on all sides of a base 15a that is provided with a recess 30 having a hole for inserting the mounting bolt 16.
are arranged at equal intervals. Each protrusion 1
5b, a plurality of groove-like recesses 31 are provided at predetermined intervals from the vicinity of the boundary with the base 15a to the outer end. The receiving material 32 is fitted into the groove-like recess 31 at a corresponding arbitrary position and fixed. This receiving material 32 is made of an electrically improved conductor such as iron or brass, and has a height higher than the depth of the groove-shaped recess 31, so that its upper part protrudes beyond the upper surface of the table 15 in the fitted state. There is. Further, a gap portion serving as a ventilation path is provided between the receiving materials 32, 32 that are adjacent to each other.

Each protruding portion 15b of the table 15 is provided with a slit 35 for attaching a workpiece fixing block 34 in the direction of the center line. As shown in FIG. 4, the workpiece fixing block 34 is
A narrow leg portion 34a is formed on the lower surface side, and by inserting this leg portion 34a into a slit 35 and screwing a fixing screw 36 into the leg portion 34a from below through the slit 35, a long length can be secured. It is fixed to the table 15 at any position of the shaped slit. A table protection plate 37 is attached around the fixed block 34.

Next, the welding head support device 3 moves the sliding portion 3a
, a vertical support 40 supported by the sliding portion 3a and movable in the horizontal direction, and an arm 41 projecting horizontally from the upper end of the vertical support 40, and the welding head 4 is attached to the tip of the arm 41. It is being In the sliding part 3a, a bearing rail 44 is provided inside a bearing base 43 that is integrated with the bearing cylinder 10 of the workpiece support base 2, and a lower end of the vertical support 40 is mounted on the rail 44 at the tip. A fixed sliding plate 45 is mounted via a bearing 46 for linear motion. The upper parts of the bearing base 43 and the sliding plate 45 are connected to a fixed cover 48 and the sliding plate 4.
5 and is covered by a movable cover 49 that is integral with it. Note that a hook-shaped cable hanging arm 51 is provided at the upper end of the vertical support 40. A cable hanger 53 is attached to the tip of the cable hanger arm 51 via a spring 52, and the intermediate portions of the welding and motor cables 55, 56 are supported on this hanger 53.

The welding head 4 has two recesses formed at the top and bottom on the front side of the casing 60, each of which serves as a gear room 61 and a roller room 62. A motor 64 and a speed reducer 65 are attached to the top of the casing 60, and a drive gear 68 is fitted onto a rotating shaft 66 that projects into the gear room 61. The drive gear 68 is in meshing relationship with two driven gears 70 and 70' via a transmission gear 69. Driven gear 7
Roller shafts 71 and 71' to which roller shafts 0 and 70' are attached vertically pass through the partition wall 60a of the gear room 61 and the roller room 62 and the roller room 62, and are provided at the partition side 60a and the lower end of the casing 60. It is supported by bearings 72, 72. Two rollers 73, 73 and 73', 73' are fitted on each roller shaft 71, 71'. Each of these rollers has a short cylindrical magnet 7.
A flange-shaped disk 7 having a larger diameter than the magnet 74 is provided on both sides of the magnet 74.
5,75 is fixed. The mounting positions of the rollers 73, 73 on the roller shaft 71 and the mounting positions of the rollers 73', 73' on the roller shaft 71' are slightly shifted vertically, and the rollers 73 and 73' are partially separated in plan view. are arranged so that they overlap.

The welding torch 80 is attached to a support frame 81 fixed to the side surface of the lower end of the casing 60 and protruding diagonally downward.
is attached to. The welding torch 80 is supported at a position below the gap between the roller shafts 71, 71', and is supported so as to face the welding line WL so that the extension line of the shaft coincides with the welding line WL.

Further, a spatter shielding device 100 is attached to the lower end of the casing 60. This spatter shielding device 100 is constructed by bending an elastic support plate 101 whose base is fixed to the back surface of a casing 60 diagonally forward at the middle part, and attaching a chip 102 made of a magnet to the tip of the support plate 101. It is something. The support plate 101 is elastically biased so as to press the tip 102 forward (towards the object to be welded), and together with the magnetic force of the tip 102, always brings the square steel pipe 6, which is the object to be welded, into close contact with the tip 102. work like that. A fixed shielding plate 104 is provided on the outside of the spatter shielding device 100. In addition to the shielding plate 104, the welding head 4 includes:
Motor protection plate 105 that protects the front of the motor 64
A cover 106 that closes off the front side of the gear room 61 is provided.

The welding head 4 attaches the arm 41 to a vertical pin 111 provided on the back side of the casing 60 and fixed by a pair of upper and lower pin receivers 110, 110'.
By fitting the cylindrical tip 41a of
It is rotatably supported by an arm 41.

Next, a method for fixing the workpiece to the table 15 of the workpiece support base 2 will be described. First, among the groove-like recesses 31 provided in each protrusion 15b of the table 15, the receiving material 32 is fitted into the recess located closest to the welding line WL. In some cases, welding line WL inside the outer circumference of the workpiece
The receiving material 32 may be provided at a position apart from the receiving member 32. Place the square steel plate 7, which is the object to be welded, on the receiving materials 32, 32, . . . , apply the fixing blocks 34 from all sides, and tighten the fixing screws 36.
A square steel plate 7 to which a square steel pipe 6 is temporarily attached via a backing metal 8 is fixed.

As mentioned above, after supporting the square steel plate 7 and the square steel pipe (column) 6, which are the objects to be welded, on the welding object support stand 2, the welding head 4 is moved and each roller 73, 7
3' is brought into contact with the outer peripheral surface of the square steel pipe 6. and,
When the motor 64 is started, the rollers 73 and 73' having magnetic force rotate, so that the object to be welded is moved to the rotating part 2b of the welding support device 2 by the frictional force with the rollers.
In this state, the welding power source is turned on and welding is performed.

Welding head 4 supporting welding torch 80
The arm 41 is movable back and forth with respect to the workpiece to be welded.
Since the rollers 73 and 73' can be freely rotated around the pin 111, the rollers 73 and 73' are always attached to the workpiece, even when the workpiece is at a corner of the square steel pipe 6. in contact with the outer surface,
Therefore, the welding torch 80 is always kept in a constant position relative to the welding location. Further, since the workpiece to be welded is rotated by the rollers 73, 73' attached to the welding head 4, a constant circumferential speed (welding speed) can be maintained at all times.

As mentioned above, during welding work, the object to be welded (square steel plate 7) is usually strained and warped in a convex manner with respect to the table surface. However, since this workpiece support base 2 supports the workpiece to be welded with the receiving material 32 near the lower position of the welding line WL, distortion occurs in the square steel plate 7, making it difficult to change the positional relationship between the table and the welding line. Therefore, the position of the welding line of the object to be welded and the torch hardly deviates. In addition, the protruding part due to the strain in the center of the square steel plate 7 is
Since there is no contact with the workpiece, the workpiece to be welded is always stably supported.

Furthermore, in this workpiece support 2, the table and the workpiece do not come into contact over a large area, so the amount of heat transferred from the workpiece to the support stand 2 is small, and moreover, there is a flow of heat between the workpiece and the workpiece on the surface of the table 15. Since the air layer has the effect of cooling the table and the object to be welded, the support base 4 does not reach a high temperature.
Therefore, the durability of the bearings and the like is improved compared to conventional support stands, and dimensional changes in the shafts, bearings, etc. can be kept small, and smooth movement can be maintained. Further, when welding is performed continuously, the table 15 does not reach a high temperature so that positioning and fixing of the workpiece to be welded is easy and safe. Furthermore, even if spatter or dust adheres between the workpiece to be welded and the top surface of the table, the workpiece to be welded will not wobble because the protruding receiving material 3 is raised higher than it. Note that the groove-shaped recess 3
1 in a row at predetermined intervals according to the specified size of the workpiece, it is convenient because it can be used as a cage for positioning the workpiece. In this case, as shown in FIG. 7, if the two workpiece fixing blocks 34, 34 are fixed in advance at predetermined positions, alignment will be made easier.

The illustrated welding apparatus 1 has a structure in which the table 15 of the workpiece support 2 rotates together with the workpiece due to the rotation of the rollers of the welding head supported in a fixed position. A similar effect can be obtained by holding the welding head in the same state and moving the welding head along the outer circumference of the workpiece. moreover,
Similar effects can be obtained when the table surface of the workpiece support is provided diagonally or vertically other than horizontally.

In addition, the receiving material 32 is not limited to the illustrated example.
It can be of various shapes, and can also be formed of a lattice, a net, or the like. Note that the receiving material 32 may be provided integrally with the table.

(Effects of the Invention) As is clear from the above description, the workpiece support table according to the present invention prevents strain on the workpiece during welding by supporting the workpiece with a receiving material that protrudes from the table surface. The workpiece to be welded can be stably supported even when the welding occurs, and the positional relationship between the welding torch and the welding line can always be kept constant, making it possible to perform proper welding. Ta. Furthermore, since the amount of heat transferred to the support base is reduced, it is now possible to expect improvements in the durability and workability of the parts.

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view of a welding device using an example of a welding workpiece support according to the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a front external view thereof, and Fig. 4 is a welding support stand. FIG. 5 is a plan view, FIG. 5 is a partial view thereof, FIG. 6 is an explanatory view showing a welding state using a conventional workpiece support, and FIG. 7 is an explanatory view of center positioning. 1...Welding device, 2...Welding object support stand, 3...
Welding head support device, 4... Welding head, 15...
...Table, 31...Groove-shaped recess, 32...Protruding receiving material, 34...Workpiece fixing block, 35...
Slit, 41...Arm, 64...Motor, 7
3,73′...Roller, 80...Torch, WL...
...Welding line.

Claims (1)

[Scope of Claims] 1. A workpiece support table used for welding by placing a workpiece such as a flat plate, which is placed on a table surface serving as a base and in contact with the bottom surface of the workpiece. A welded workpiece support stand, characterized in that a protruding support member supporting the welded workpiece is arranged substantially along a weld line. 2. The welded workpiece support stand according to claim 1, wherein the protruding receiving material is divided into a plurality of pieces, and an interval for ventilation is provided between adjacent projecting receiving materials. 3. The welded workpiece support stand according to claim 1 or 2, wherein a groove is provided on the table surface, and the lower part of the protruding receiving member is removably fitted into the groove. 4. The welded workpiece support stand according to claim 3, wherein a plurality of grooves for fitting receiving materials are provided at predetermined intervals in the radial direction of the table.