JPS60152329A - Cylinder forming device - Google Patents

Abstract

PURPOSE:To suppress deformation in the circumferential direction, and to work a cylindrical material to a thin state by heating a working part of said cylindrical material, and pressing the outside circumferential surface of the material in the direction orthogoanl to an axis. CONSTITUTION:A working part is heated in narrow width on the circumference, deformation in the circumferential direction of a cylindrical material 4 is suppressed, and also the shapes of pushing rools 5, 6 are compressed narrowly in the axial direction, therefore, a cylinder is deformed in the axial direction. On the other hand, a mandrel 7 and the cylindrical material 4 have a small clearance, drawn in the circumferential direction by the pushing tools 5, 6 and receive a reducing force. Accordingly, a cylinder which adheres tightly to the mandrel 7 and has high accuracy is formed. The working part is heated in the course of working, too, therefore, the temperature does not fall, and it can be worked to a sufficiently thin state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder forming apparatus that can be applied to thin-walled cylinders.

Conventionally, cylindrical moons were produced by forging an implant I- and then punching a hole, and then a ring and twelve mill was used for figures, as shown in Figure 1, and a ring mill was used for accessories. In the ring forging shown in Fig. 1, a mandrel 2 is placed inside a cylindrical material 1.
Insert the ``ζ'' cylindrical material 1 into the press tool 3, which is mounted on a press or the like (=t 4), with the S rail supported at both ends or one side.
It is compressed and molded. As shown in Fig. 1, the mandrel 2 and the pusher 3 are arranged in parallel, and the cylindrical element +
The decrease in the thickness of A1 is mostly an elongation in the circumferential direction, and the cylindrical diameter increases.

On the other hand, as a special method of use, when it is desired to avoid an increase in the diameter of the cylinder, the mandrel 2 and the pusher 3 may be arranged at right angles, although not shown. Ring forging is hot working, and since the cylindrical material 1 is larger than the mandrel 2 and the diameter is expanded by forging, the cooling rate of the cylindrical material 1 is slow, which is convenient for forming. However, the cylindrical material 1 sandwiched between the mandrel 2 and the pusher 3 is less constrained during compression, resulting in poor molded product accuracy and the need to add a large extra wall thickness to the required thickness. Furthermore, because of hot working, thin walls cannot be processed by cooling, which combined with the aforementioned poor molded product accuracy, requires a large number of man-hours to be machined to the required thickness.

Thin-walled cylindrical materials for figures have traditionally been produced by bending lightning plates and then welding them, but this has been difficult to manage due to issues such as weight reduction and quality, and for this reason, there has been a desire to create a one-piece cylinder without welding. was there. Currently, the wall thickness of the one-piece cylindrical material is at least 60 mm.
1, and it required a large number of man-hours to remove the excess metal and also required abrasive fees, which was a problem in terms of cost.

The present invention was proposed to solve the above-mentioned conventional drawbacks, and consists of a mandrel inserted into a cylindrical material with a small clearance, and a means for pressing the mandrel and the outer peripheral surface of the circle in a direction perpendicular to the axis. We provide a cylindrical molding device that can easily ensure molded product accuracy, suppress deformation in the circumferential direction by heating narrowly on the periphery, and suppress deformation in the circumferential direction by a pressing means, and can process even thin walls because there is no temperature drop. That is.

Embodiments of the present invention will be described below with reference to the drawings. FIG.
and compressed with pushers 5.6. The cylinder 4 is a spare cylinder 8 (The requirement for a cylinder without a weld line is that it must be thin, lightweight, and strong, and these materials are expensive compared to general steel materials. The spare cylinder 8 is used for the purpose of effectively using the cylinder 8. Therefore, the spare cylinder 8 is not a component of the present invention.

The cylindrical material 4 is the chuck 9 (the chuck 9 is the mandrel 7
The left side of the mandrel can be moved in the axial direction of the mandrel, and rotation is performed simultaneously with the mandrel. The chuck 9 can also be moved from the hentos dock 10 through the lot 14 to the front and back of the mandrel on the sliding table 13.

Further, the chuck 9 has a key or spline attached to the mandrel so that it rotates at the same time as the mandrel. In some cases, the chuck may be driven by the sliding table 13. ) and indexed by the hemlock stock 10, making it possible to move in the axial direction. Further, the other end of the man I/rel 7 is a holding table 11, and a high frequency heating coil 12 or a gas burner is arranged around the processing section immediately before the processing section.

FIGS. 3 and 4 are detailed views of the area around the processing area, and the front of the processing area of the mandrel 7 is slightly cut in order to ease the cooling of the heated material.

Further, the pusher 5.6 is narrow in the axial direction of the mandrel 7 and widened in the right angle direction.

Next, to explain the effect, by heating the processed part narrowly to the circumference, the circumferential deformation of the cylindrical element +A4 is suppressed, and since the shape of the pusher 5.6 narrowly compresses it in the axial direction, the cylinder deforms in the axial direction. On the other hand, the clearance between the mandrel 7 and the cylindrical material 4 is made small, and it is compressed in the circumferential direction by the pusher 5.6 and receives a force for reducing the diameter, so that it is in close contact with the mandrel 7.
Cylinders can be formed with high precision. In addition, in the conventional method, it is heated in a furnace and cooled during processing, but in the present invention, local processing is performed, and the processing area is heated even during processing, so it is possible to process sufficiently thin walls without decreasing the temperature. becomes. Furthermore, this method is economical because conventional presses, mandrels, pushers, etc. can be used as they are.

Since the present invention is structured as described in detail, it is easy to ensure the precision of the molded product, and by narrowly heating the same, the outer circumferential surface of the material near the heated part (=J) can be heated in the direction perpendicular to the axis By providing a means for pressing, deformation in the circumferential direction is suppressed, and since there is no temperature drop, it is possible to process even thin walls.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional forming state of a cylindrical material, Fig. 2 is a partial side view of a cylindrical forming apparatus showing an embodiment of the present invention, and Fig. 3 is an enlarged cross-sectional view of the main part. , FIG. 4 is a front view of the same. Description of the main fip parts in the figure 4 - Cylindrical element + A' 5.6 - Push tool (pressing means) 7 Mandrel 9 - Chuck 10 = Head stock 11 - Holding stand 12 - High frequency heating coil (heating means) Patent applicant Mitsubishi Heavy Industries, Ltd. company

Claims (1)

[Claims] A cylindrical forming apparatus comprising: a mandrel inserted into a cylindrical material with a small clearance; and means for pressing the mandrel and the cylindrical material in a direction perpendicular to rotation.