JP2018159414A - Manufacturing method of disc spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To disclose a manufacturing method of a disc spring which can reduce a weld failure.SOLUTION: When butt-welding one end 10A of a belt ring body which is formed into a C-shape in a circumferential direction, and the other end 10A in the circumferential direction, a pointed end part 10E formed at one end 10A and a pointed end part 10F formed at the other end 10B are made to contact with each other. Next, by applying a voltage to a contact part while pressurizing the belt ring body 10 so as to increase the contact pressure of a pair of the pointed end parts 10E, 10F, the contact part is heated, and thus the ends are welded. Then, since an area of the contact part becomes small in the pointed end parts 10E, 10F, a distribution of a heating temperature of the contact part becomes uniform compared with the case that the contact part has a relatively-large area. Accordingly, since the contact part is stabilized, favorable welding can be performed.SELECTED DRAWING: Figure 3

Description

  The present application relates to a method of manufacturing a belt ring shaped disc spring.

  For example, in the manufacturing method of a disc spring described in Patent Document 1, a flat belt spring steel material is rolled to form a C-shaped ring (hereinafter also referred to as a band ring body), and the band ring body One end in the circumferential direction is welded to the other end in the circumferential direction.

JP 2001-225112 A

  In welding using heat generation during energization such as resistance welding, the current flowing during welding tends to flow on the surface of the band ring body. When one end in the circumferential direction of the band ring body and the other end in the circumferential direction are in contact with each other with a relatively large area, the heat generation temperature distribution at the contact portion tends to be non-uniform. If the heat generation temperature distribution at the contact portion is non-uniform, poor welding is likely to occur. This application discloses the manufacturing method of the disc spring which can reduce a welding defect.

  In the method of manufacturing a belt ring-shaped disc spring by butt welding the circumferential end (10A) and the other circumferential end (10B) of the belt ring body (10) formed in a C shape. The pressure contact step of bringing the tip (10E) provided at one end (10A) into contact with the tip (10F) provided at the other end (10B) and the contact pressure between the pair of tips (10E, 10F) A welding step in which a voltage is applied to the contact portion (10C) to heat the contact portion (10C) while pressurizing the band ring body (10) so as to increase.

  And if it is a point part (10E, 10F), since the area of a contact part will become small, compared with the case where it contacts in a comparatively large area, the heat_generation | fever temperature distribution of a contact part will be equalize | homogenized. Therefore, since the contact portion is stabilized, good welding can be performed.

  Incidentally, the reference numerals in the above parentheses are examples showing the correspondence with the specific configurations described in the embodiments described later, and the present invention is limited to the specific configurations indicated by the reference numerals in the parentheses. It is not something.

1 is an external view of a disc spring 1 according to an embodiment of the present invention. It is explanatory drawing of the belt ring body 10 which concerns on embodiment of this invention. It is a figure which shows the manufacturing method which concerns on 1st Embodiment of this invention. It is explanatory drawing of the belt ring body 10 which concerns on 2nd Embodiment of this invention.

  The “embodiment of the invention” described below shows an example of an embodiment belonging to the technical scope of the present invention. In other words, the invention specific items described in the claims are not limited to the specific configurations and structures shown in the following embodiments.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the arrow etc. which show the direction attached | subjected to each figure are described in order to make it easy to understand the relationship between each figure. The present invention is not limited to the directions given in the drawings.

  At least one member or part described with at least a reference numeral is provided, except where “one” or the like is omitted. That is, when there is no notice such as “one”, two or more members may be provided.

(First embodiment)
1. Disc Spring In this embodiment, the present invention is applied to a method of manufacturing the disc spring 1 shown in FIG. The disc spring 1 is a belt ring-shaped ring. The disc spring 1 is configured such that the ring is formed in a substantially conical taper shape. Therefore, (φ1 × π) <(φ2 + 2 × W) × π.

2. Method of manufacturing disc spring The disc spring 1 is formed by welding a band ring body 10 (see FIG. 2) formed in a C shape into an annular shape. In addition, the manufacturing apparatus of the disc spring 1 shape | molds the belt ring body 10 formed in the C shape by giving roll processing to flat belt spring steel materials (refer FIG. 2).

As shown in FIG. 3, point portions 10 </ b> E and 10 </ b> F are provided on each of the circumferential end 10 </ b> A and the other circumferential end 10 </ b> B of the band ring body 10.
The pointed portion 10E is an acute-angled portion with the pointed end 10F protruding to the side. The apex portion 10F is an acute-angled portion with the apex 10E protruding to the side. The pointed portions 10E and 10F according to the present embodiment have a substantially L-shaped or substantially U-shaped pointed shape in which the widthwise center of each of the one end 10A and the other end 10B protrudes. The “width direction” is the direction indicated by the dimension W in FIG.

  As shown in FIG. 3, the manufacturing apparatus for the disc spring 1 performs welding in a state where the tip portion 10E provided at one end 10A and the tip portion 10F provided at the other end 10B are brought into pressure contact with each other. The welding process by the manufacturing apparatus is as follows.

  In the welding process, the manufacturing apparatus pressurizes and compresses the contact portion 10C via the jigs 11A and 11B while applying a voltage to the contact portion 10C between the one end 10A and the other end 10B to generate heat. To do. At this time, the manufacturing apparatus compresses and compresses the one end 10A and the other end 10B until at least the tip portions 10E and 10F disappear.

  After the end of the welding process, the manufacturing apparatus performs “normalizing” on the band ring body 10 to homogenize the metal structure. Thereafter, the manufacturing apparatus performs cold plastic working on the band ring body 10 to form the band ring body 10 into a substantially conical taper shape (dish shape). Next, the manufacturing apparatus performs “quenching” and “tempering” on the band ring body 10 and then performs barrel polishing on the band ring body 10.

3. Features of the manufacturing method according to the present embodiment In the present embodiment, the contact portion 10C is stabilized, so that good welding can be performed. That is, the current flowing during welding tends to flow on the surface of the band ring body 10. For this reason, when the one end 10A and the other end 10B come into contact with each other in a relatively large area, the heat generation temperature distribution of the contact portion 10C tends to be non-uniform.

  On the other hand, if the tip portions 10E and 10F are used, the area of the contact portion 10C is small, so that the heat generation temperature distribution of the contact portion 10C becomes uniform as compared with the case where contact is made with a relatively large area. Therefore, since the contact portion 10C is stabilized, good welding can be performed.

(Second Embodiment)
In the present embodiment, as shown in FIG. 4, the circumferential length from one end 10 </ b> A of the band ring body 10 before welding to the other end 10 </ b> B is longer than the circumferential length of the band ring body 10 after welding. The manufacturing apparatus performs the welding process in a state in which the band ring body 10 is deformed so as to expand and the one end 10A and the other end 10B are brought into contact with each other.

Thereby, it can suppress that big "tensile residual stress" generate | occur | produces in the band ring body 10 which the welding process was complete | finished.
That is, since the manufacturing apparatus pressurizes and compresses the contact portion 10C during welding, the circumferential length of the band ring body 10 after welding is shorter than the circumferential length before welding. For this reason, there is a possibility that a large “tensile residual stress” is generated in the band ring body 10 after the welding process.

However, in this embodiment, since the circumferential length before welding is longer than the circumferential length after welding, a large “tensile residual stress” is unlikely to occur even when the contact portion 10C is compressed by pressure during welding.
The manufacturing apparatus according to the present embodiment pressurizes and compresses the contact portion 10C to bulge a part of the contact portion 10C to the outer peripheral side during the welding process. A manufacturing apparatus excludes the site | part which expanded at the said welding process by the grinding process or grinding | polishing process after completion | finish of a welding process.

  The difference between the circumferential length before welding and the circumferential length after welding (also referred to as a lapping allowance) is desirably a predetermined dimension that is equal to or larger than the compression dimension when the contact portion 10C is compressed by pressure. Note that the same constituent elements as those of the above-described embodiment are denoted by the same reference numerals as those of the above-described embodiment, and thus redundant description is omitted.

(Other embodiments)
In the embodiment described above, the welding process is performed by upset welding. However, the invention disclosed in this specification is not limited to this, and other welding methods may be used.

  The pointed portions 10E and 10F according to the above-described embodiment were acute angle portions. However, the invention disclosed in this specification is not limited to this. That is, the tip portions 10E and 10F according to the present application may have any shape that reduces the cross-sectional area as it approaches the tip. Therefore, for example, the tip portions 10E and 10F may be configured by an obtuse angled part, a trapezoidal part, or a semicircular part.

  The present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims. Therefore, you may combine at least 2 embodiment among several embodiment mentioned above.

  10 ... Band ring body

Claims (3)

In the method of manufacturing a belt ring-shaped disc spring by attaching and welding one end in the circumferential direction of the band ring body formed in a C shape and the other end in the circumferential direction,
A pressure-contacting step of bringing a tip provided at the one end into contact with a tip provided at the other end; and
And a welding step of applying a voltage to the contact portion to heat the contact portion while pressurizing the band ring body so as to increase the contact pressure between the pair of tip portions. The pointed end of the one end is provided at the substantially center in the width direction of the one end,
The disc spring manufacturing method according to claim 1, wherein the tip of the other end is provided substantially at the center in the width direction of the other end. In the method of manufacturing a belt ring-shaped disc spring by attaching and welding one end in the circumferential direction of the band ring body formed in a C shape and the other end in the circumferential direction,
A press-contacting step in which the circumferential length from the one end to the other end deforms a C-shaped belt ring body longer than that after welding and contacts the one end and the other end;
A welding step of applying a voltage to the contact portion to generate heat by applying a voltage to the contact portion while pressurizing the band ring body so as to increase the surface pressure of the contact portion between the one end and the other end. Production method.