JP2562247Y2 - Positioning pin - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning pin, and more particularly to a positioning pin used for positioning a steel sheet and welding it in, for example, an automobile manufacturing process.

[0002]

2. Description of the Related Art Conventionally, metal such as S45C is used for a positioning pin, but there is a drawback that the service life is limited when the number of steel sheets is about 5,000 to 50,000, because the wear resistance and corrosion resistance are not sufficient. .

[0003] Ceramics such as silicon nitride and sialon have characteristics such as high strength, high hardness, high wear resistance, and light weight. Therefore, a positioning member having a circular cross section is considered as a positioning member for a positioning pin. Have been. However, when determining the position of the steel sheet in only one direction, it is not clear about the structure of a specific positioning pin that can sufficiently withstand a mechanical shock when loading and unloading the steel sheet.

[0004]

The object of the present invention is to determine the position of a steel sheet in only one direction, made of ceramics, which has excellent durability against mechanical shock when loading and unloading the steel sheet. It is intended to provide a positioning pin.

[0005]

That is, in the present invention, a ceramic positioning member 2 having a through hole is disposed on the upper surface of a metal fixing member 1, and the metal introducing member 3 is moved through the through hole. The positioning pin mounted on the fixed member 1 is characterized in that the cross section of the metal introducing member 3 and the ceramic positioning member 2 has an elliptical shape.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1A is a partially cutaway sectional view showing one embodiment of the present invention, and FIG. 1B is an AA sectional view. That is, the positioning pin of the present invention includes a metal fixing member (hereinafter, simply referred to as a fixing member) 1, a ceramic positioning member (hereinafter, simply referred to as a positioning member) 2 having a through hole, and a metal introducing member (hereinafter, simply referred to as a positioning member). 3). More specifically, the positioning member 2 is positioned on the upper surface of the fixing member 1, and the shaft portion 4 of the introducing member is inserted through the through hole of the positioning member 2 so that the introducing member 3 and the fixing member 1 are connected to each other by a coupling means such as a screw portion 5. It has a structure to be mounted more.

A major feature of the present invention is that the cross sections of the introduction member 3 and the positioning member 2 are elliptical. By doing so, it is possible to increase the thickness of the introduction portion and the positioning portion while securing a clearance allowance for the steel sheet.
Breakage due to mechanical shock when loading / unloading the steel sheet in one direction is less likely to occur.

The fixing of the introduction member 3 and the fixing member 1 is preferably screwed with a screw portion 5 provided on the shaft portion. In this case, a loosening preventing agent such as an adhesive or solder may be applied.

When positioning the positioning member 2 on the upper surface of the fixing member 1, it is preferable to adopt a structure in which a part of the outer peripheral straight body of the positioning member 2 is incorporated inside the fixing member 1 as shown in FIG. . By doing so, the positioning member 2 does not shift due to an external force from the steel plate during use.

The positioning member 2 and the introduction member 3 may be manufactured to have an elliptical cross section before assembly.
After a circular cross section is assembled, it may be processed into an elliptical shape.

The material of the positioning member 2 is selected from ceramics such as silicon nitride, sialon, zirconia, alumina, and silicon carbide. Silicon nitride is preferable from the viewpoint of wear resistance and corrosion resistance. The method of sintering ceramics can be selected from normal pressure sintering, hot pressing, and HIP depending on the shape and required performance.

Although the introduction member 3 has the shaft portion 4 provided with a coupling means such as a screw portion 5, both need not be integrally formed, and both may be separately manufactured and integrated. Also,
At that time, both materials may be different.

The introduction member 3 preferably has a straight body 7 having the same outer circumference as the positioning member 2. The reason is that if the straight body portion 7 is not provided, that is, if the diameter of any one of the outer circumferential straight body portions of the positioning member 2 and the introduction member 3 is different and there is a level difference, the loading and unloading of the steel sheet is performed. This is because there is a possibility that an impact is directly applied to the positioning member 2.

Further, it is desirable that the introduction member 3 has a tapered portion 6, whereby the loading and unloading of the steel sheet is further facilitated. There is no particular limitation on the shape of the tapered portion 6, and the head can be flat or hemispherical so that commercially available bolts and rivets can be used.

The fixing member 1 has a welding machine (not shown).
It is desirable to provide attachment means such as a screw portion 8 and a tapered portion (not shown) for attachment to the like.
Of course, the positioning pin of the present invention can be mounted by welding, bonding, or the like without providing mounting means.

Although the head of the fixing member 1 shown in FIG. 1 has a shape enlarged in the outer peripheral direction, this is a measure for conveniently attaching to a welding machine or the like, and is not always necessary in the present invention. Absent.

The material of the fixing member 1, the introduction member 3, and the shaft portion 4 of the introduction member is a metal material, such as carbon steel (S45C, S50C), chromium molybdenum steel (SCM), and alloy tool steel (SKS).
, SKD, etc.) and stainless steel (SUS).

[0019]

The present invention will be described more specifically with reference to examples and comparative examples.

The fixing member 1 is made of S45C, and the positioning member 2 is made of silicon nitride ceramic in the form of a round pipe manufactured by normal pressure sintering.
SCM435 (hardness HRC40) was used as the introduction member 3 integrally formed with the shaft portion 4 of the introduction member. When the introduction member 3 is inserted into the through hole of the positioning member 2 and screwed to the fixing member 1, the screw portion 5 which forms a part of the shaft portion of the introduction member and the through hole of the positioning member 2 are provided with a locking agent (Japanese). "Loctite" manufactured by Loctite Co.) was applied. Next, the positioning portion and the introduction portion were machined to change the cross-sectional shape from a circular shape to an elliptical shape to produce the positioning pin shown in FIG. The overall dimensions are approximately 50mm high x 8mm diameter.

As a result of using this positioning pin in a manufacturing process of an automobile, the positioning portion of the vehicle body where the steel plate comes into contact does not show any wear and sufficiently withstands the mechanical impact when loading and unloading the steel plate in one direction. Met. Further, the service life was greatly extended as compared with the conventional metal positioning pins, and welding of 100,000 or more steel plates was achieved without care.

On the other hand, when the cross-sectional shape of the positioning portion and the introduction portion was processed into a rhombus shape, chipping occurred in the positioning portion before welding 5,000 steel sheets, and the device could not be used.

[0023]

[Effects of the Invention] The positioning pin of the present invention is excellent in wear resistance and sufficiently withstands the mechanical shock when loading and unloading a steel sheet in one direction, so that a long service life can be achieved.

[Brief description of the drawings]

1A is a partially cutaway sectional view of a positioning pin according to an embodiment of the present invention, and FIG. 1B is an AA sectional view.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 metal fixing member 2 ceramic positioning member 3 metal introducing member 4 shaft portion of metal introducing member 5 screw portion of shaft portion 6 taper portion 7 straight body portion 8 screw portion of fixing member

Claims (1)

(57) [Scope of request for utility model registration] 1. A ceramic positioning member (2) having a through hole is disposed on an upper surface of a metal fixing member (1),
In the positioning pin having the metal introducing member (3) mounted on the metal fixing member (1) through the through hole, the cross section of the metal introducing member (3) and the ceramic positioning member (2) is elliptical. A positioning pin having a shape.