JPS6160230A - Production of calking type poly v pulley - Google Patents

Abstract

PURPOSE:To manufacture a poly V pulley easily by providing a flange part with the press work of the pipe blank material having the specified thickness, by forming the inclined face corresponding to the flange by the press formation of the thin iron plate having the specified thickness and by unifying the both with a calking method. CONSTITUTION:The pipe 1 having >=3mm thickness is cut in a fixed length (l) and the blank material 6 for the peripheral wall part consisting of flange parts 3, 4 and a peripheral wall part 5 is formed with the press work of the both end faces 2a, 2b thereof. A bottom wall part is then made with the press work of the circular plate blank material 7 consisting of 2-2.6mm and the peripheral wall part is made inclined faces 8a, 8b and a bottom wall part blank material 9 is formed. A pulley blank material 12 is then made by fitting the inclined faces 3a, 3b of the flange part of the blank material 6 for the peripheral part and the inclined faces 8a, 8b of the blank material 9 for the bottom wall part and by unifying with a rotary calking method. A poly V groove is formed by a form-rolling roller on the peripheral wall part of said pulley blank material 12.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a poly V pulley used for driving various auxiliary machines of an automobile engine, and relates to a poly V pulley using a poly V pulley. It is widely used as a poly V pulley to drive automobile engines and home appliances.

(Prior art) As a prior art related to the present invention, Japanese Patent Publication No. 58-5489
There is a publication titled ``■ Manufacturing method for ribbed pulleys'' No. 8, which involves press-forming a thick sheet metal material into a cup shape, making the bottom wall thin, leaving the peripheral wall the same thickness as the sheet metal material, and using a punch. The poly-V pulley material is formed through approximately 13 press processes in which flanges are formed at both ends of the peripheral wall by die processing, and then the peripheral wall is formed into poly-V by rolling rollers.
A method of manufacturing a poly-V pulley having grooves formed therein is disclosed.

However, this conventional manufacturing method involves more pressing steps between the pulley materials than sheet metal materials, resulting in higher costs, and also has the following problems.

In other words, referring to FIG. 2, when a thick circular sheet metal material 20 is made into a cup shape 21 and the thickness 22 of the bottom wall portion is made thinner than the thickness of the sheet metal material, it is very difficult to make the bottom wall portion uniformly thin. If the center part 23 of the bottom wall part becomes too thin than the specified dimensions, or the center part becomes convex as shown in 24, it is difficult to make the bottom wall part perpendicular to the peripheral wall part by just press forming. It is extremely difficult to form this, and therefore a process to correct this is required, which requires equipment and man-hours.Furthermore, if the peripheral wall and bottom wall are integrally molded, the thickness of the peripheral wall opening can be adjusted by press working. The problem is that the poly V groove tends to become thick and tapered 26, and when forming the poly V groove with a rolling roller, the accuracy of the poly V groove is difficult to obtain, the life of the rolling roller is shortened, and the cost of the poly V pulley increases. There is a point.

(Problem to be solved by the invention) Poly V pulleys used in automobile engines can withstand high loads and are used by being attached to various auxiliary equipment in a narrow engine room, so the thickness of the peripheral wall functions as a poly V pulley. Top 3.
0 mm or more, and the thickness of the bottom wall part is required to be 2.6 ** or less from the viewpoint of size and weight reduction, and the present invention has developed a high-load, lightweight poly V pulley. When manufacturing from sheet metal material by press molding, the thickness of the bottom wall is 2.61 AI or less and uniform, and the center part of the surface of the bottom wall does not have the above-mentioned concave or convex shape. No correction process is required at all, and the peripheral wall is 3. The technical problem is to create a poly V pulley material with a uniform thickness of O111 or more, and to create a low cost poly V pulley manufacturing method that requires few processing steps and can form poly V grooves using a rolling roller. It is something to do.

[Structure of the invention]

(Means for solving the problem) The method taken to solve the above problem was to cut an iron pipe material having a certain thickness (more than 3.0+im) into a certain size, and press both ends of the pipe. A flange portion is formed by processing and used as a peripheral wall material, and then as a separate member 2-2.
A thin iron disk disc material consisting of 6 fins is pressed, and the flange part is formed as a 1-parameter slope while leaving the thickness of the peripheral part unchanged, and the central part has a mounting hole for the boss or a shape that matches the mounting shape. The circumferential wall material and the bottom wall material are integrated by a rotation caulking method with the inclined surfaces of the flange portions aligned to form a poly V pulley material. A poly V groove is formed using a rolling roller to manufacture a poly V pulley.

(Operation) The above technical means operates as follows. That is, 3
．． A flange is formed by press forming a pipe material with a thickness of 0 mm or more, a slanted surface corresponding to the flange is formed by press forming a thin iron plate of 2 to 2.6 mm, and the two are integrated by caulking. Therefore, even if the peripheral wall is formed by a rolling roller, the inner peripheral surface of the peripheral wall is flat and the height of the peak of the poly V groove is 4.2 cm from the inner peripheral surface.
The height of the peak and the dimension of the valley of the groove are 3.1 cranes, which fully satisfies the required dimensions and is made of poly V that can withstand high loads.
Grooves can be formed, and by pressing only the shape, the thickness of the sheet metal remains the same at the bottom wall.
There are no irregularities on the surface of the bottom wall, and at the caulking part between the peripheral wall material and the bottom wall material, the bent part of the peripheral wall material and the bottom wall material is used to temporarily fix the material and attach it to the rotating mold. The slanted surface of the bottom wall and the flange of the peripheral wall material are securely caulked and fixed by the action of the freely rotatable bottom wall science and engineering mold and flange forming mold to form the final shape of the flange. It is something to do. Further, a small knurled convex portion is provided on the surface of a freely rotatable bottom wall pressing die so that the bottom wall material bites into the flange portion to form a poly V pulley material.

The poly V pulley material formed in this way has no problems in terms of strength and has no dimensional errors in perpendicularity.Furthermore, after caulking is completed, the poly V pulley material is used to form a poly V groove using a rolling roller. The caulking strength can be confirmed, and even if the dimensions, flatness, and concentricity of the poly V pulley are strict, it can be sufficiently achieved, and the poly V pulley with accurate dimensions can be manufactured.

(Example) Hereinafter, an example showing a specific example of the above technical means will be described.

1 is a pipe made of structural steel with a thickness of 3.0 mm or more, cut to a certain length l, and both end surfaces 2a and 2b of the pipe 1 are pressed to form an enclosing wall part consisting of flange parts 3, 4 and a peripheral wall part 5. A material 6 is formed.

Next, a circular sheet metal material 7 made of 2.0 to 2.6 cranes is pressed to form the bottom wall, the peripheral wall is made into inclined surfaces 8a and 8b, and a mounting hole and a mounting screw hole are formed on the drive shaft. A blank bottom wall material 9 is formed, and then the inclined surfaces 3a and 3b of the flange portion of the surrounding wall material 6 and the slopes 8a and 8b of the bottom wall material 9 are temporarily fixed together and molded into a rotary mold. 10, and the bottom wall pressing mold 11, which is free to rotate, is crimped with the flange forming mold 12 to completely caulk and fix the inclined surface of the bottom wall to the flange part 3 on one side of the surrounding wall material. This is shown in 13. Also, the bottom wall pressing die 11 is placed on the slope 3a around 1 of the flange part.
By appropriately providing a knurling-like convex portion 11b on the surface 11a that comes into contact with the bottom wall pressing die 11, concave caulking portions lla and llb are created on the outer peripheral surface of the flange, making it even stronger. It is also possible to stick to.

Next, poly V grooves 14a, 14b, .
A poly V pulley 17 is manufactured.

Due to the protrusion of the poly V groove, the poly V pulley 17 manufactured by this method has a height of 4.2** or more from the inner peripheral surface 16 of the peripheral wall portion to the peak of the poly V groove, and the height of the peak of the poly V groove is 4.2** or more. The distance between the top and the valley is 3.1 mm, which has enough strength to withstand high loads, and the bottom wall has a uniform thickness and is perpendicular to the axis.

〔Effect of the invention〕

The present invention produces the following unique effects. In other words, it is possible to manufacture a poly V pulley that can withstand high loads, is lightweight, and has correct dimensional accuracy; (2) The inspection method for loosening of caulked parts is relatively easy, and the appearance is good. (3) The overall pressing process is reduced by 11 times compared to the conventional process, and therefore various molds can be easily inspected. is reduced, and a low-cost poly-V pulley can be manufactured.

[Brief explanation of drawings]

FIG. 1 shows an embodiment according to the present invention, in which (a) is a cross-sectional view of the pipe material, (b) is a cross-sectional view of the flange part, and (
C) is a cross-sectional view of the circular sheet metal, (D) is a cross-sectional view of the bottom wall material, (E) is a cross-sectional view of the caulking process, and (
(f) is a sectional view of the poly V pulley material, and (g) is a sectional view of the poly V pulley. Figure 2 is a caulking process diagram of the outer surface of the flange, (a) is an enlarged cross-sectional view before caulking, (b) is a cross-sectional view during caulking, and (c) is an enlarged side view with some parts omitted. be. Figure 3 shows cross-sectional views of the main processes of the conventional example, in which (a) is a cross-sectional view of the sheet metal material, (b) is a cross-sectional view of the cup-shaped can, and (c) to (d) are the bottom views. This is a cross-sectional view in which the wall portion has an uneven thickness or a convex shape. 6... Surrounding wall part material, 9... Bottom wall part material, 13...
Caulked portion, 15... integrated peripheral wall portion.

Claims (1)

[Claims] After press-molding a metal material to form a cup-shaped can consisting of a peripheral wall and a bottom wall, and forming a flange on the peripheral wall,
In a method for manufacturing a poly V pulley in which a poly V groove is formed using a rolling roller, both end faces of a metal pipe of a certain length with a wall thickness of 3.0 mm or more are press-worked to form a flange portion and used as a peripheral wall material. Next, a disc material having a diameter of 2.0 to 2.6 mm is press-worked to form a flange part at the peripheral part to form a bottom wall part material, and the peripheral wall part material and the bottom wall part material are joined at the flange part. A method for manufacturing a caulking type poly V pulley, in which poly V grooves are formed on the peripheral wall portion using rolling rollers after integration using a rotation caulking method.