JPS6216824A - Method and device for drawing flange - Google Patents

Abstract

PURPOSE:To draw and form a cylindrical stock having a U-shaped section quickly and with a high yield by drawing a projecting part of an end of the held cylindrical stock in the outside pheripheral direction, then turning over and holding the stock again, and drawing the projecting part of another end of the stock in the outside pheripheral direction. CONSTITUTION:A cylindrical stock 1 is put onto an end part of a collet body 2 having slits 3. Then, a cone-shaped plate 14 of a pusher rod 13 is inserted into the collet body 2 to expand outside and to clamp the stock 1 between the body 2 and a clamp ring 11. In that state, a convergent roller 15 is moved in the direction of the arrow A, the stock 1 is rotated, and a projecting part from the clamp ring 11 is expanded to be formed into flanges 1' and 1''. Then, a half formed product 16 is removed by an ejector rod 4, is turned over,and is clamped between the body 2 and a half ring 22 in the same way as the above. Next, another end of the half formed product 16 is expanded to be formed into flanges 16' and 16'' by the roller 15 to draw and form a flange of a product 28 having a U-shaped section.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a seven-lunge drawing method ξ device, and in particular,
For processing oil seals in spinning molding, tire rims, etc.

This invention relates to a method and apparatus useful for edge bending of cylindrical materials.

<Prior Art> A conventional spatula drawing process will be explained with reference to FIGS. 9 and 11.

FIG. 9 shows the starting state of the spatula drawing process, and in the figure, 51 is a mandrel, 52 is a disk on top of the material, and 53 is a press plate. The mandrel 51 has two stepped portions 55 and 56 on its outer periphery.
and has a hole 57 in the center of the end. 69 is a screw portion. The disk 52 has a hole 59 in the center. The push plate 53 has a rear shaft 54 and a front shaft 58 coaxially, and the front shaft 58 is passed through a hole 59 in the disk 52 and a hole 57 in the mandrel 51 to press the disk 52 against the mandrel 51. 9th
The spatula drawing process begins from the state shown in the figure.

Figure 1O shows the first process of spatula drawing, and one disk 52 is 52
-1.52-2 As shown in the intermediately shaped end portion, the product is first formed into a cup-shaped intermediate molded product 521 through a spatula drawing stage. Thereafter, by cutting the bottom layer part 63 of this cup-shaped intermediate molded product 521 with the cutting tool 62, the bottom plate 648 is cut off, and the bottomless cup-shaped intermediate molded product 5 is obtained.
2 @ Make so. Next, the press plate 53 is moved to the left and the intermediate molded product 52''i is removed from the mandrel 51.

FIG. 11 shows the second step, in which the inner ring 668 is inserted into the mandrel 51 and the bottomless cup-shaped intermediate molded product 5 is pressed.
21, and then a half ring 65 is fitted into the circumference of this intermediate molded product 521, and tightened with a cap nut 67.

In this state, the mandrel 51 is rotated and the left cylindrical end 71 of the intermediate molded product 52'' is manually pushed outward several times using a spatula 708 to form the product. 68 is a hook 9 groove for the cap nut 67, 73 is a molded product, and 74 is a bolt for fixing the half ring 65.

After the molding shown in FIG. 11, the cap nut 67 is removed and the molded product 73 is removed from the mandrel 51 with the half ring 65 attached, and then the bolt 74 of the half ring 65 is removed and the molded product 73 is removed. Weir out.

<Problem that the invention seeks to solve> In the prior art shown in FIGS. 9 to 11.

There are problems (1) to (4) below.

(1) Material: When making a material from 1 normal rectangular material force) from which the material is a disk 52, one step is slow.

(2) Waste material: At the end of the first process, the bottom plate 64 is cut off as shown in Figure 1O.

Waste material is generated.

(3) Forming speed: (a) Spatula drawing requires at least two types of spatulas in the first step, one for drawing and one for squaring, and the processing time is long.

(b) A process of cutting off the bottom plate 64 is required. It is essential.

(C) Even in the second step of squeezing with a spatula, Several enlargement steps using La70 It takes about an hour.

(4) Material removal: Rectangular material removal processing of the disk 52 is generally troublesome.

Note that the punching process with a press is used. It's easy if you can use it.

This is limited to Tendo production. It ends up.

An object of the present invention is to provide a flange drawing method and apparatus that solve the problems (1) to (4) mentioned above.

<Means for Solving the Problems> The flange drawing method according to the present invention which achieves the above-mentioned objects uses a cylindrical material as a raw material.

A first step ξ in which one end of this material is made to protrude by a predetermined dimension and then gripped, and this protruding portion is drawn in the outer circumferential direction.
In this method, a cylinder having a U-shaped cross section is drawn by a second step of inverting the processed material, gripping the material with the other end protruding by a predetermined amount, and drawing this protruding portion in the outer circumferential direction.

Moreover, the 7-range drawing device according to the present invention is as follows.

As a cylindrical material support device, there is a collet main body having a slit groove and a cylindrical material attached to the outer periphery, and a fan-shaped outer circumferential surface that protrudes and fits into the slit groove of the collet main body so that it can slide inside the collet main body. A half ring that clamps the fitted ejector rod and one cylindrical material from the outer periphery.

The collet body is provided with a diameter expanding member that expands the diameter of the collet body.

Effect> If the material is a cylindrical material, it can be obtained by rolling a rectangular material and welding it. Cutting a rectangular material into strips results in an extremely good material yield. Furthermore, if the material is cylindrical, the cylindrical portion and the corner portion, which take the longest spatula drawing time in the conventional method described in FIG. 10, do not need to be processed.

<Example> An example of the present invention will be described with reference to FIGS. 1 to 8. Figures 1 and 2 show the first step, and Figures 3 and 4 show the first step.
The figure shows the second step.

FIG. 5 shows a cylindrical material, and FIGS. 6 to 8 show a support device for the material.

The case of forming a sheet metal groove ring having a U-shaped cross section will be described as an example. In Fig. 1, 1 is a short cylindrical sheet metal welding material, 2 is a collet body, 3 is a slit groove, and the sixth
As shown in the figure, the collet body 2 is divided into a plurality of parts. The material 1 is made by rounding up strips, butting them together, and seam welding them as shown at 30 in FIG. Reference numeral 4 denotes an ejector rod, which is disposed within the collet body 2, supported by a concentrically fixed bushing 5, and fitted so as to be slidable in the axial direction thereof. As shown in FIG. 7, several plates on the outer circumferential surface 7 of the front end 6 of the ejector rod 4 have a fan shape with a thickness that allows them to fit into the slit groove 3 of the collet body 2 and slide in the axial direction. Each tip has a protrusion 8 protruding from the slit groove 3). 9 is a collar ring; 11 is a clamp ring containing the material 1'5; the collar ring 9 is screwed onto the clamp ring 11 with a screw 10 by sandwiching the protrusion 8 of the ejector rod 4; Reference numeral 12 designates a space for accommodating the protrusion 8, which is bored on the inner circumference of the collar ring 9. Reference numeral 13 denotes a pusher rod, and a conical plate 14 is integrally formed at the tip of the pusher rod. The pusher rod 13 can be moved in its axial direction by a power source (not shown) such as a hydraulic cylinder. The upper half of Fig. 1 shows a cylindrical material 1 fitted into the clamp ring 11, the ejector rod 4 retracted to the right in the drawing, the button shear rod 13 moved to the right in the drawing, and the conical plate 14 to the main body of the Tecolet. 27i - By enlarging, the cylindrical material 1') between the clamp ring ll and the collet body 2? This shows the clamped state. In this state, while moving the tapered a-ra 15 in the direction of the arrow A and rotating the cylindrical material l, the portion of the edge M that protrudes from the crumpling 11 is continuously l+, X
Expand as shown in a. The molding of one end is completed at the roller position indicated by 15'. That is, molding can be performed in a-91 passes, and the molding time is extremely short.

FIG. 2 shows a state in which 16% of the intermediate molded product formed in the first step as shown in FIG. 1 is removed.

First, the pusher rod 13 is moved to the left from the state force 1 in Fig. 1 to release the clamp on the intermediate molded product 16, and the ejector rod 4 is pushed out to the left in the figure by the power of a hydraulic cylinder, etc. . Then, clamp ring 11
is pushed out to the left while containing the intermediate molded product 16, and the collet body 2 is released from the force 1. FIG. 2 shows this state.

FIG. 3 shows the second step. The second process is done using the M1 excavator shown in Figure 1! /7 This is to perform flange forming on the other end of the intermediate molded product 16 which has been subjected to flange forming. In FIG. 3, the same reference numerals are assigned to each member 2 and 13 to 15 that can be used in common with those in FIG. 1. In FIG. 3I, 21 is an inner crumbling ring, and 22523 is a half ring for accommodating an intermediate molded product. The half rings 22 and 23 can be opened and closed using the pin 24 as a hinge, as shown in FIG. Reference numeral 25 denotes a bolt, which can be passed through the hole 27 of one half ring 22 and screwed into the tapped hole 26 of the other half ring 23, as shown in FIG. The intermediate molded product 16 is fitted into the collet body 2 while being housed in the half rings 22 and 23, and the butcher rod 13 is moved to the right.

Intermediate molded product 168 - collet body 2 with the conical plate 14
and the half rings 22 and 23. In this state, move the roller 15 in the direction of arrow A, and while rotating the intermediate molded product 16i, continuously move the portion protruding to the left from the half ring 22, 23 as shown in 16', 16'. Expanding. This completes the finished product 28.

In this case as well, molding can be performed in one pass through the o-ra.

Molding time is extremely short.

Figure 4 shows the product 28 of the second process molded as shown in Figure 3.
The figure shows the state in which it is removed. The butcher rod 13 is moved to the left, the product 28 is removed while being fitted into the half rings 22 and 23, and then the bolt 25 is pulled out and the product 28 is taken out.

By the way, 1 cylindrical material 1 is made by rolling up a rectangular plate and butt-seam welding it as shown in Fig. 5, so when the end surface is 7-lunged, naturally material 1 will be elongated.
It becomes easy to break at the bath contact part. Therefore, it is important to select a material to be welded that is very similar to the base material, and to finish the weld so that the thickness of the welded part is the same as that of the base material. Further, depending on the material, after welding, it is preferable to perform normalizing or annealing, and to perform heat treatment so that the mechanical properties of the welded part are equal to those of the base metal.

The locus indicated by the arrow A of the a-ra 15 in FIGS. 1 and 3 is provided by known means such as a hydraulic tracing device (not shown) or a cam method.

Although the shape of the o-ra 15 is tapered in the above embodiment, it may be cylindrical or slightly tapered. However, if the R (FIG. 1) of the tip portion of the a-ra 15 is made as large as possible, the finished surface roughness of the side surface of the formed flange will be improved.

<Effect of the invention> According to the present invention, the material is a cylindrical material.

Since it is obtained by rolling rectangular materials and welding them together, the yield from rectangular materials is good, and the material can be easily removed using a shear or the like.

In addition, since the material itself does not have a bottom plate, that part is not wasted, there is no need to cut off the material, and there is no need to work on cornering. As a result, processing time is reduced to a fraction of that of conventional methods.
Reduce to

Furthermore, by adopting a one-round granite support device, automation is possible, which drastically reduces the labor of 91 people, greatly improving work efficiency, and improving and uniforming the quality of finished products.

[Brief explanation of drawings]

1 to 8 relate to one embodiment of the present invention. Figure 1 is a sectional view of the apparatus in the first step, Figure 2 is a sectional view of the apparatus with the intermediate molded product removed, and Figure 3 is the sectional view of the apparatus in the second step.
A cross-sectional view of the device in the process. FIG. 4 is a cross-sectional view of the device in a state where a product is being taken out. FIG. 5 is a perspective view of the material, FIG. 6 is a perspective view of the collet body, and FIG. 7 is a perspective view of the ejector rod. FIG. 8 is a perspective view of the halves in the open position. FIGS. 9 to 11 are cross-sectional views of a conventional spatula drawing machine at each step. In the drawings, l is the cylindrical material, 2 is the collet body, 3 is the slit groove, 4 is the ejector rod, 5 is the bush, 6 is the front end of the ejector rod, 7 is the fan-shaped outer peripheral surface, 8 is the same projection, and 9 is the same. Color ring, 10 is bolt, 11 is clamp ring. 12 is a space, 13 is a pusher rod, 14 is its conical plate, 15 is a-ra, 16 is an intermediate molded product, 21 is a clamp ring, 22 and 23 are half rings, 24 is a bottle, 25 is a bolt, 26 is a tapped hole, 27 is a hole, 28
is a finished product.

Claims (2)

[Claims] (1) In a method of drawing a cylinder with a U-shaped cross section, the first step involves using a cylindrical material as a material, holding the material with one end protruding by a predetermined dimension, and drawing this protruding portion in the outer circumferential direction. and a second step of inverting the material processed in the first step, protruding the other end by a predetermined dimension, gripping the material, and drawing the protruding portion in the outer circumferential direction. (2) In a device that draws a cylinder made of cylindrical material and having a U-shaped cross section, the collet body has a slit groove and the cylindrical material is attached to the outer periphery, and the collet body protrudes into and fits into the slit groove of the collet body. A cylindrical material support device includes an ejector rod having a fan-shaped outer peripheral surface and slidably fitted into the collet body, a half ring that clamps the cylindrical material from the outer periphery, and a diameter expanding member that expands the diameter of the collet body. A drawing device equipped as a.