JPH0137775Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an improvement of a forming device for processing the head of a cylindrical container into a polygonal shape.

(Prior art) Cases of vehicle oil filters, fuel filters, etc. have a cylindrical body W that is taller than the diameter, as shown in Figure 1 A and B, and the side surface of the head Wa is designed to maintain strength. The head Wa is polygonal (15-sided) in order to facilitate screwing into a bracket, etc., but the head Wa is usually shaped into a polygon by a forming device as shown in Fig. 2 after the drawing process of the cylindrical body W is completed. It is processed into a square shape.

That is, the large diameter portion 1a of the convex hole formed at the lower end of the die holder 1 integrated with the ram A of the press machine.
An annular form die 2 is fitted to the upper part of the bolster B, and a spacer ring 4 for height adjustment and a ring 3 for holding the cylindrical body are arranged below the ring to hold the form die 2 immovably. A punch 6 of a required height is installed in the formwork 5, and a blank holder 7 is arranged around it so that it can be raised and lowered via a cushion pin 7a. Holding die 3 for upper mold body W
Insert the head Wa into the punch 6 by
It is forcibly pressed between the inner surface of the form die 2, which forms a polygon in which the diameter of each inscribed circle is slightly smaller than the outer diameter or inner diameter of the cylindrical body W, and the outer surface of the punch head 6a to form a polygon. ing.

By the way, forming a polygonal head was conventionally considered to be a part of the drawing process (mainly stretching the material with a punch to form it) to form a cylindrical container, so the outer surface of the punch head 6a was made polygonal. It was said that the material was molded to match this shape.

(Problem to be solved by the invention) In this conventional one, the cylindrical body head Wa
is forced into the polygonal gap formed by the polygonal inner surface of the form die 2 and the polygonal punch head 6a, which places stress on the material, and the inner surface of the form die 2 and the outer surface of the punch head 6a Since both form a polygon, when installing them, it is necessary to align the two and align the edges at the same time, which is quite troublesome. Since it is mounted in an immovable state, if it is misaligned, the thickness of the product will not be uniform, and if it is misaligned (misaligned edges), it may cause scratches or cracks, making it unusable. .

The purpose of this invention is to provide a polygonal head molding device that allows easy installation of a form die and punch, allows processing without forcing the cylindrical body, and prevents cracks and uneven thickness. shall be.

(Means for Solving the Problem) This invention includes an annular form die 2' having an inner surface slightly smaller than the outer diameter of the cylindrical body W to be processed and a polygon, and an elastic ring 2b' provided on the outer surface of the form die 2'. The head 6a' of the punch 6' installed in the center of the formwork 5 on the bolster is fitted into the large diameter part 1a of the convex hole provided at the lower end of the die holder through the cylinder. This is an apparatus for forming a polygonal head of a cylindrical container, which is formed into a circle equal to the inscribed circle of the processed polygon of the head Wa of the shaped body W.

(Function) The forming device of this invention attaches the form die 2' to the die holder 1 and the punch 6' to the formwork 5. At this time, since the head 6a' of the punch 6' is circular, the polygonal shape of the form die 2' is There is no corner matching operation.

Next, when the cylindrical body W drawn to the required depth is held by the cylindrical body holding die 3 and pushed into the punch 6', the head Wa of the cylindrical body W is transferred to the head of the punch 6'. It starts to fit into 6a'. Then, when the form die 2' is positioned outside of that, the outer circumferential surface of the cylindrical body head Wa is pressed against the polygonal inner surface of the form die 2', which is slightly smaller than this, and the polygonal surface of the cylindrical body head Wa is The part corresponding to the center of each side of the square is sandwiched between the circular punch head 6a', and the other part is deformed by adapting to the inner surface of the form die 2' in the gap between the form die 2 and the punch head 6a'. death,
Shaped into a polygon.

Furthermore, even if there is an eccentricity in the attachment of the form die 2' and the punch 6', a part of the elastic ring 2b' is compressed to move the form die 2', thereby preventing uneven thickness.

(Example) FIG. 3 shows an example of this invention.
A die holder 1 is attached to the ram A of a press machine via a shank 8, and a convex hole is provided at the lower end of the die holder 1. An annular form die 2' having a polygonal inner surface slightly smaller than the diameter is fitted, and a spacer ring 4 for height adjustment and a die 3 for holding the cylindrical body are disposed below the form die 2'. The holding die 3 and spacer ring 4 are screwed to the die holder 1 to sandwich the form die 2',
Further, a punch 6' of a required height is planted in the center of the formwork 5 mounted on the bolster B, and an annular blank holder 7 is fitted on the outside of the punch 6' and is raised and lowered via a cushion pin 7a. The configuration of the points that can be freely configured is the same as the conventional one.

By the way, in this invention, the outer diameter of the annular form die 2' is made slightly smaller than the diameter of the large diameter part 1a of the convex hole of the die holder 1, and a recess 2' is formed in the center of the outer peripheral surface of the form die 2'. It is formed into an annular shape, and an elastic ring 2 made of rubber or the like is placed in the recess 2a' so that its outer surface abuts the large diameter portion 1a of the hole.
b' is mounted so that the form die 2' can move radially in the large diameter part 1a of the hole, and the head 6a of the punch 6' provided on the lower formwork 5. As shown in FIG. 4, the outer peripheral surface of ' is formed to form a polygonal inscribed circle (slightly smaller than the inner diameter of the cylindrical body W) after processing the cylindrical body head Wa.

Therefore, the cylindrical body W drawn to the required depth as usual is set on the blank holder 7,
The ram A is lowered and the holding die 3 pushes the cylindrical body W as shown in Fig. 3, and the head Wa of the cylindrical body W begins to fit into the head 6a' of the punch 6'. When the form die 2' is positioned outside the cylindrical body head Wa, the outer peripheral surface of the cylindrical body head Wa is pressed against the polygonal inner surface of the slightly smaller form die 2', and the inner peripheral surface is formed on each side of the polygon. Only the portion corresponding to the center is pressed against the circular punch head 6a'. In this way, the head Wa of the cylindrical body conforms to the inner surface shape of the form die 2' and is shaped into the same polygonal shape.

In this case, one punch head 6' for machining the head Wa of the cylindrical body has a circular shape equal to the diameter of the inscribed circle of the polygon after machining the workpiece, and has no corners, and forms the inner surface of the form die 2'. Since there is a gap between the corner of
The material to be processed is deformed easily along the corners of the polygonal inner surface of the form die 2' and fits well into the inner surface of the polygon. (Of course, the inner surface of the cylindrical body does not need to have corners as sharp as the outer surface.) The reason why the punch head 6a' can be made circular is that the polygonal head of the container is formed as described above. This is because it was confirmed that the process was not a drawing process, but a compressive deformation process using a form die.

In addition, even if the axes of the form die 2' and the punch 6' do not match as shown in Fig. 5 for some reason and there is a slight misalignment, the form die 2' presses a part of the elastic ring 2b' and presses the elastic ring 2b' in the left and right directions. Since processing is performed by moving in either direction by the amount of misalignment, uneven thickness will not occur.

(Effects of the invention) As described above, in this invention, in an apparatus for forming the head of a cylindrical body into a polygon, a form die having a polygonal inner surface is fitted to a die holder so that it can move in the radial direction, and Since the head of the punch implanted on the formwork is formed into a circle equal to the inscribed circle of the machining polygon of the head of the cylindrical body, the head of the cylindrical body can be machined without forcibly squeezing it. Therefore, there is no need to be careful about alignment and positioning between the form die and the punch, and the durability of the device is improved. Moreover, it has the effect of preventing uneven thickness and cracks in the cylindrical container.

[Brief explanation of the drawing]

FIG. 1A is a longitudinal sectional view of the cylindrical body. Figure B is its plan view. FIG. 2 is a longitudinal sectional view of a conventional molding device. Third
The figure is a longitudinal sectional view of an embodiment of this invention. Figure 4 is the third
A half-sectional view taken along the line XX in the figure. FIG. 5 is a sectional view of the main parts showing the machining state when misalignment occurs. In the figure, 1...Die holder, 1a...Large diameter part of hole, 2,
2'...Form die, 2a'...Recess, 2b'...
Elastic ring, 3... Holding die, 4... Spacer ring, 5... Formwork, 6, 6'... Punch, 6a,
6a'...head, 7...blank holder, A...ram, B...bolster, W...cylindrical body, Wa...its head.

Claims (1)

[Scope of utility model registration request] An annular form die 2' having a polygonal inner surface whose inscribed circle diameter is slightly smaller than the outer diameter of the cylindrical body W to be machined is installed in the large diameter portion 1a of the convex hole provided at the lower end of the die holder 1. is movably fitted in the radial direction via an elastic ring 2b' provided on the outer surface of the form die 2', and the form die 2' is supported by a spacer ring 4 and a cylindrical body holding die 3, and A polygonal cylindrical container formed by forming the head 6a' of the punch 6' installed in the center of the formwork 5 into a circle equal to the inscribed circle of the processed polygon of the head Wa of the cylindrical body W. Head shaping device.