JPH01180727A - Manufacture of disk spring - Google Patents

Abstract

PURPOSE:To form a disk spring in the shape of a truncated cone without using a punch die, a forming die by passing and rounding the flat surface of band steel through a bending machine composed of three rolls in such a direction that it intersects to the axial line of each roll, cutting the lapped site and then butt-welding the cut sites. CONSTITUTION:The band steel is used as the stock and the band steel 3 is passes and rounded at a cold state among three rolls 2, 2, 2 arranged at the top sites of a triangle in such directions that the flat surface in its width direction intersects to the axial lines 0 of the rolls. Then, the band steel is cut at the lapped site, then, the initial cut area 4 and the terminal cut area 5 are butt-welded to form a disk spring stock 6 in the shape of a truncated cone. If the grooves 2' of the rolls 2, 2, 2 are shifted, the band steel 3 passing the grooves 2' can be worked slantingly to make a conical surface of an optional shape. Thereafter, the band steel is quenched, tempered and finished to manufacture a disk spring.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing disc springs, especially those with a thick plate.
This invention relates to a method of manufacturing a pan suitable for cases where the outside diameter is large.

(Conventional technology) Conventionally used large disc springs are manufactured by hot punching a fixed length material such as carbon tool steel, alloy steel, stainless steel, etc., first on the inner diameter and then on the outer diameter. After normalizing, rough processing, hot press forming into the shape of a disc spring, quenching and tempering, and finishing by grinding at least 0.4 mm on one side to remove decarburized parts, scale, and material scratches. is being carried out.

(Problems to be Solved by the Invention) This manufacturing method has drawbacks such as a poor yield because it is punched from a plate material, and there are many heating steps, and there are many scales and decarburized parts due to hot working. Moreover, since the rolling direction is unidirectional, the spring characteristics are not symmetrical about the axis.

In view of this, the present invention has been made for the purpose of eliminating the drawbacks of the prior art by providing a method for manufacturing a disc spring that uses strip steel as the material and is formed by cold working. be.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for coldly rolling a steel strip between at least three rolls arranged at the vertices of a triangle so that the flat surfaces of the steel strip intersect with the axis of the rolls. It is rounded by passing it through in the opposite direction, then cut at the overlapping parts, and the cut surfaces are welded to form a disc spring material with a truncated conical side surface, followed by a quenching/tempering process and a finishing process. It is characterized in that it is manufactured through a process.

(Example) The present invention will be described below with reference to an example shown in FIGS. 1 and 2.

The present invention uses a steel band (flat bar) as a material, and the bending process is made up of three rolls placed at the vertices of a triangle.
The band W43 is passed between each roll 2.2.2 of Al in a cold manner with the flat surface in the width direction in a direction perpendicular to the axis O-0 of the roll 2.2.2 so as to be rounded. After being processed and cut at the overlapping parts, welding is performed so that the first cut surface 4 and the last cut surface 5 are brought into contact with each other.
The process of forming the side surface into a disc spring material 6 having a truncated conical shape is performed in the order shown in FIG. 1, and then quenching and tempering.
The manufacturing of the disc spring 7 is completed through the finishing process.

In this case, the shape of the spring material is changed by shifting the grooves 2' provided in the rolls 2.2.2 to change the spacing, so that the strip steel in each roll 2.2.2 (D groove 2') is 2.
It is machined with an inclination between 2.2 and 2.2 to make it possible to create a conical surface of any shape.

Further, flash butt welding or electron beam welding is used to butt weld the cut end surfaces 4.5.

Finishing is performed on the inner and outer inclined surfaces and the inner and outer diameters.

Although the roll bending machine 1 is shown using three rolls 2, the number may be increased as appropriate depending on the bending situation.

To show an example of implementation using this manufacturing method, the width of the steel strip is 50 mm.
mm, thickness 3.2 mm, material 353C is bent using a roll bending machine, cut at the overlapping parts, and the cut surfaces are flash butt welded at 100 A/mm" for 5~
10 ports, 4 ports, 5 seconds of energization time, hardening 8
1 hour at a temperature of 40°C to 870°C, then tempered for 47
The test was carried out at a temperature of 0°C to 540°C for 1 hour.

In addition, materials such as 543C and 545C% SUP with a carbon content of 0.45 to 0.55% are used, and preheating and postheating are not required, resulting in a yield rate that is 2 times higher than conventional ones.
A value of 70% was obtained compared to 0-30%.

(Effects of the Invention) As described above, according to the method of the present invention, the material yield can be improved to 70% compared to the conventional 20-30%.
The number of processing steps is reduced compared to conventional methods, and there is no need for punching dies or forming dies.Also, by changing the spacing of the roll positions, it is possible to manufacture any shape, and since the rolling direction is concentric, it is possible to create springs. The characteristics are axially symmetrical. Furthermore, since it is a cold working process, there is less heat processing and there is no scale, which makes it possible to achieve many excellent processes.

[Brief explanation of the drawing]

Fig. 1 shows the manufacturing process of the disc spring according to the present invention, in which (a) shows the raw steel strip, (b) shows the arrangement of the three zero rollers, and (
e) is a state diagram in which the material is cold bent with three rollers, (d) is a state diagram in which the rolled material in (C) is cut and both end surfaces are butted together, and (e) is a state diagram in which the material is bent by three rollers. (f) is a diagram showing the finished state of the disc spring material after quenching and tempering; Figure 2 is a cross-sectional view of the finished disc spring manufactured by the manufacturing process shown in Figure 1; The figure shows the manufacturing process of a conventional disc spring. (a) is a standard length material (raw material), (b) is a standard length material whose inner diameter is hot punched, and (c) is a standard length material whose inner diameter is hot punched. are the punched material and the remaining material, (d) is a state diagram of the material after rough processing after normalizing, and (e) is the state of the disc spring material after hot forming (pressing) from the state of (d). Fig. 2(f) is a diagram showing the completed state of the disc spring which has been quenched, tempered, and finished from the state shown in (e). 1... Bending machine 2... Roll 3... Material 4.5... Both end faces 6... Disc spring material
7... Disc spring 0-0... Axis Applicant Komatsu Ltd. Representative (patent attorney) Oka 1) Kazuyoshi (b) (C) Figure 3 (a) (b) (c)
2' (.) (d) (e)
(f> Figure 1 Figure 2

Claims (1)

[Claims] The steel strip was cold rolled by passing it between at least three rolls arranged at the apex of a triangle with the flat surfaces thereof in a direction perpendicular to the axis of the rolls, and cut at the overlapping parts. A method for manufacturing a disc spring, characterized in that the cut surface is then welded to form a disc spring material having a truncated conical side surface, and the disc spring material is then manufactured through a quenching/tempering process and a finishing process. .