JPS631158B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is directed to forming a flat steel plate into a cylindrical shape, such as a steel motor frame, compressor housing, fire extinguisher body, etc., and processing the joints by seam welding or the like. This invention relates to a clamping device used to keep the joint position constant during the process.

Configuration of conventional example and its problems FIG. 1 shows a conventional clamping device. The configuration of this conventional example will be explained below. In FIG. 1, 1 is a flat plate of the workpiece. 2 is a mandrel, and the flat plate 1 is wrapped around this mandrel 2 in a cylindrical shape and clamped. 3 is the lower clamp, 4 is the right clamp, 5 is the left clamp,
Right clamp 4 and left clamp 5 are lower clamp 3
It has a fulcrum 6 and is connected. Clamp 3,
4 and 5 are driven by cylinders 7, 8 and 9, respectively.

Next, the operation will be explained. In FIG. 1, when the flat plate 1 is laterally inserted into the lower part of the mandrel 2, the lower clamp 3 is raised, and the central part of the flat plate 1 is clamped to the mandrel 2 for forming. Next, the right clamp 4 and the left clamp 5 operate in this order, and the flat plate 1 is formed into a cylindrical shape along the mandrel 2, and the clamping is completed. However, in the above conventional example, three clamps 3,
4 and 5, the flat plate 1 is directly formed and wound around the mandrel 2, so there is a limit to the roundness of the cylindrical shape of the mandrel and the accuracy of positioning the cylinder end face, and the clamping operation is limited due to the fact that the flat plate is supplied as is. However, there was a limit to the productivity improvement achieved by shortening the operating time.

Purpose of the Invention The present invention eliminates the drawbacks of the conventional examples described above, and provides a clamping device that can improve the roundness and end face alignment accuracy of cylindrical objects and improve productivity by shortening operation time. This is what I am trying to do.

Structure of the Invention In order to achieve the above-mentioned object, the present invention involves forming a flat plate into a cylindrical shape in a pre-process such as forming with two or three rolls, and placing an object already formed into a cylindrical shape on a mandrel. On the other hand, the left and right clamps and the intermediate section are comprised of a device that performs clamping using a leaf chain with rollers and aligns the end faces of the cylinder.The series of these operations improves the precision of the cylinder shape and shortens the clamping operation time. It is effective.

DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a front view of a clamp device in one embodiment of the present invention. In FIG. 2, 10 is a cylindrical object made of a steel plate formed into a cylindrical shape. Reference numeral 11 denotes a positioning fitting for the circumferential end surface, and a mandrel 12
Positioning in the circumferential direction when inserting the cylindrical object 10 is performed. Reference numeral 13 denotes a left clamping metal fitting, which performs a clamping operation with a cylinder 14. Reference numeral 15 denotes a right clamp fitting, to which a small diameter cylinder 17 and a large diameter cylinder 18 are connected via an arm 16. Left clamp fitting 1
3 and the right clamp fitting 15 are respectively attached with end face alignment cylinders 19 and 20, and these cylinders 19 and 20 press the end faces of the cylindrical object 10 to correct misalignment of the end faces on the left and right sides of the circumferential joint. 21 is a leaf chain, one end of which is connected to the left clamp 13;
The other end is connected to a cylinder 23 via a chain clamp fitting 22. 24 is a disk electrode located above the mandrel 12, and the cylindrical object 10
The joints are pine seam welded.

Figure 3 shows the left clamp fitting 13 and chain 21.
It is a side view of the connection part of. The left clamp fitting 13 has a groove 25, and this groove 25 is a guide groove for an end alignment fitting 26 at the tip of the end alignment cylinder 19. The chain 21 includes links 27 and rollers 28
It is composed of a combination of

Next, the operation of the above embodiment will be explained. Fourth
The figure shows the operation process of the present clamping device, and will be explained in conjunction with FIG. 3. First, the cylindrical object 10 is inserted into the mandrel 12 with the circumferential joint regulated by the position regulating fitting 11 (FIG. 4a). next,
The cylindrical object 10 is clamped by the left clamp fitting 13 by the operation of the cylinder 14, and the mandrel 12
When it is fixed, the position regulating fitting 11 retreats (FIG. 4b). Next, the right clamp fitting 15 performs clamping with the small diameter cylinder 17. This small diameter cylinder 17 is used to clamp the mandrel 12.
The cylindrical object 10 is only lightly held down to the extent that it does not move, and at the same time, the clamp pressure in the left clamp cylinder 14 is exhausted. however,
The left clamp fitting 13 does not operate and is in a state where it presses the cylindrical object 10 against the mandrel 12 by its own weight (FIG. 4c). Next, the end face alignment cylinder 19,
20 moves forward and pushes the left and right sides of the seam of the cylindrical object 10, correcting the deviation between the left and right end faces. At this time, the cylindrical object 10 is held against the mandrel 12 by the left and right clamp fittings 13, 15 under low pressure, so that no positional deviation occurs in the circumferential rotation direction (FIG. 4d). Next, left clamp cylinder 1
0, compressed air is supplied again and the left clamping fitting 9 performs left clamping. Subsequently, the chain 21 is wound around the mandrel 12 using the chain clamp cylinder 23 to perform chain clamping. The function of the rollers 28 incorporated in the chain 21 is to prevent damage to the cylindrical object 10 due to slippage occurring between the chain 21 and the cylindrical object 10 when the chain is clamped.
This chain clamp has a shape in which the cylindrical object 10 is successively brought into close contact with the mandrel 12 from the left end of the circumference toward the right end of the circumference, and the right end of the cylindrical object 10 pushes up the right clamp fitting 15 by the small-diameter cylinder 17. It runs onto the left edge of the circumference (Fig. 4 e). Finally, the right clamp fitting 15 clamps the cylindrical object 10 by the operation of the large diameter cylinder 18, completing a series of clamping operations to a predetermined position (FIG. 4f). After clamping is completed, pine seam welding is performed using the disc electrode 24, but the cylinder is always clamped at a certain position with a certain lap margin by the above-mentioned clamping device, which can play an important role in performing perfect pine seam welding. become.

Effects of the Invention The present invention has the above-described configuration, and provides the following effects.

(a) Since three clamp fittings and a chain connecting them are used to wrap the cylinder around the opposite mandrel and clamp it over almost the entire circumference, the cylinder has good internal diameter dimensional accuracy and roundness.

(b) Because the end face alignment is corrected, there will be no misalignment of the left and right ends of the circumferential seam.

(c) Since the steel plate formed into a cylinder in the previous step is inserted into the mandrel and clamped, the movement of each clamping metal fitting is small, the clamping operation time can be shortened, and productivity can therefore be improved.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional clamping device, Fig. 2 is a front view of a clamping device according to an embodiment of the present invention, and Fig. 3 is a side view showing the connecting part of the chain clamp of the left clamp fitting and the end face alignment cylinder part. FIGS. 4a to 4f are partial sectional views of FIG. 10... Cylindrical object, 11... Position regulating fitting, 1
2...Mandrel, 13...Left clamp fitting, 1
4...Cylinder, 15...Right clamp fitting, 1
7... Small diameter cylinder, 18... Large diameter cylinder, 19, 20... End face alignment cylinder, 21...
...leaf chain.

Claims (1)

[Claims] 1. A mandrel having the necessary inner diameter in order to keep the joint of an object formed into a cylindrical shape from a single plate in a fixed position and a constant circular diameter;
A cylindrical object is wound around this mandrel, and a leaf chain incorporates a clamp fitting that clamps the left and right sides of the circumferential surface, a roller that clamps the circumferential surface between the left and right clamp fittings, and a circumferential joint. A clamp device comprising a first regulating fitting for regulating, a second regulating fitting for regulating a cylindrical end face, and a cylinder for driving the first and second regulating fittings.