JP2001286939A - Unit for dowel forming - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an unit for dowel forming capable of forming a dowel without deforming an original shape of a work. SOLUTION: The unit is provided with an unit block 3 which is fixed to a lower die 51 of a press machine and on which a work 80 is placed, a dowel die 1 in which a recessed face for dowel forming is formed on a rear face and which is fixed to an upper die 52 of the press machine and holds the work 80 with the unit block 3 in descending an upper die 52, a press pin 2 fixed to the upper die 52 of the press machine, a dowel punch 10 mounted on the unit block 3 corresponding to the recessed face of the dowel die 1 and movably up/down, and a cam 6 which is mounted on the unit block 3 as freely tilting and in which one end interposing an tilting center is positioned under the press pin 2 and the other end is positioned under the dowel punch 10, when the upper die 52 is descended, the one end is pressed/tilted by the press pin 2, the dowel punch 10 is pushed up with the other end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dowel forming unit for forming a dowel on a flat portion of a work by overhang forming.

[0002]

2. Description of the Related Art A work that requires dowel molding includes, for example, a slide rail of a vehicle seat. In vehicles equipped with a sliding seat, the seat is mounted on a slide rail provided on the floor surface, and the seat can be freely moved back and forth along the slide rail. Such a slide rail is formed with a dowel projecting into the rail in order to prevent the seat from slipping out. The dowel is formed by overhanging the bottom surface of a slide rail having a U-shaped cross section with a press device. By the way, in addition to the dowels, a square hole for a slide lock is formed in the bottom surface of the slide rail, so that it is considered that the dowel overhanging and the square hole punching are performed simultaneously in the same process. Therefore, a conventional dowel forming unit for forming a dowel (hereinafter referred to as a "dowel unit") and a press-forming square hole unit for punching a square hole (hereinafter referred to as a "square hole unit") will be described. I do.

In the case where the stretch forming and the punching are performed at the same time, the dowel unit and the square hole unit are provided on the upper die and the lower die of the same press. Here, FIG. 6 is a cross-sectional view showing the dowel unit and the square hole unit, and particularly shows a state at the time of completion of processing. In the slide rail 80 shown in FIG. 6, the cross section in the longitudinal direction is indicated by a solid line, and the cross section in the width direction of each processing portion is indicated by a broken line.

[0004] The dowel unit 60 includes a lower die 51 of a press machine.
A dowel punch 61 is provided upright, and a pad 62 penetrated by the dowel punch 61 is supported by a unit block 63 with a spring 64 from below. Therefore, the dowel punch 61 is configured to protrude relatively to the pad 62 that moves up and down. On the other hand, a dowel die 65 is applied to the upper mold 52 from below by a spring 67. The dowel die 65 penetrates the guide portion 63A of the unit block 63, is slidably supported via a bush 66 so as to be able to move on the same axis as the dowel punch 61, and further between the guide portion 63A and the upper end flange portion. It is urged upward by the arranged spring 67.

Next, in the square hole unit 70, a unit block 72 having a die 71 is fixed to a lower die 51, and a perforated punch 73 is applied to the upper die 52 from below by a spring 77. A cylindrical stripper 74 is superimposed on the hole punch 73, and these are unit block 72.
The outer stripper 74 is slidably supported by a bush 75, penetrating the guide portion 72A provided at the bottom. A stripper rubber 76 and a spring 77 are vertically inserted between the flanges of the hole punch 73 and the stripper 74. The perforated punch 73 is urged upward by the spring 77, and one stripper 74 is guided by the guide portion 72 by the stripper rubber 76 and the spring 77.
Pressed to A. In addition, this square hole unit 7
Nos. 0 are punched out in several places on the long slide rail 80, so that a number of square holes are provided.

The dowel unit 60 and the plurality of square hole units 70 are arranged on the upper die 52 and the lower die 51 of the press machine such that the dowel die 65 and the perforated punches 73 are aligned. Here, FIGS. 7 and 8 are sectional views showing the dowel unit and the square hole unit in each processing step.
When the dowels are formed on the slide rails 80 and the square holes are punched out, first, as shown in FIG. 7, the dowel die 65 urged by springs 67 and 77 and the hole punch 7 are used.
3 are pressed against the upper mold 52 before descending. There, the slide rail 80 is set. The slide rail 80 passes the dowel die 65 and the perforated punch 73 through the slit portion thereof, and
It is placed on the pad 62 and the dice 71 with zero. After setting the slide rail 80 in this way, the upper die 52 is lowered.

In the dowel unit 60, the dowel die 65 is pushed down with the lowering of the upper die 52, and the flat bottom surface 80B of the slide rail 80 is pressed down from above as shown in FIG. At that time, the pad 62 is pressed down by the dowel die 65, and the dowel punch 61 is relatively pushed up from below. Therefore, the slide rail 80 is pressed against the dowel die 65, and a hemispherical dowel having a spherical shape formed by the concave surface 65A of the dowel die 65 and the tip of the dowel punch 61 is shown in FIG. It is molded as follows. On the other hand, the square hole unit 70
Then, as the upper die 52 is lowered, the perforated punch 73 is pushed down, and the perforated punch 73 punches the bottom surface 80B of the slide rail 80 as shown in FIG. Thus, a dowel is formed at the end of the slide rail 80, and a square hole is formed at a predetermined position.

[0008]

However, in the structure of the conventional dowel unit 60, as shown in FIG. 6, when a press working apparatus for simultaneously performing dowel forming and drilling by the same press machine is constructed, a slide rail is required. Inconveniences such as bending in the longitudinal direction of 80 occur. In the conventional dowel unit 60, since the slide rail 80 is pressed against the fixed dowel punch 61 and formed, the height of the bottom surface 80B of the slide rail 80 differs between before and after forming. This is because, when drilling is performed at the same time, the dowel unit 60 side is preliminarily raised by the amount of lowering the bottom surface 80B of the slide rail 80 so that the height of the square hole unit 70 coincides with the height of the square hole unit 70 after molding.

Therefore, when the slide rail 80 is mounted on each of the units 60 and 70, the slide rail 80 is inclined as shown in FIG. 7, and when the dowel is formed and drilled simultaneously, the slide rail 80 is inclined. The raised portion is pressed against the perforated punch 73 and bent as shown in FIG. When distortion occurs due to bending, problems such as hindering smooth sliding of the sheet occur. The dowel unit 60 has a pad 62.
Moves up and down, so the slide rail 80 is placed in a free state. Therefore, when the bottom surface of the slide rail 80 is pressed and stretched by the dowel die 65, portions other than the portion where the dowel is formed are also stretched. Then, distortion remains after molding, and the slide rail 8
0 does not stand upright as shown by the solid line in FIG.
As indicated by the broken line, the stiffness expands in the width direction and becomes deformed. When the groove width increases in this way,
The function of the slide rail 80 is reduced.

Accordingly, the present invention provides a dowel forming unit capable of dowel forming without breaking the original shape of a work, and a dowel forming unit capable of performing punching with the same press. The purpose is to do.

[0011]

A dowel forming unit according to the present invention is fixed to a lower die of a press machine and has a unit block on which a work is mounted, and a concave surface for dowel forming is formed on a lower surface of the unit. The dowel die that moves up and down according to the upper mold, and holds the work with the unit block when it descends, the pressing pin that moves up and down according to the upper mold of the press machine, and the unit block corresponding to the concave surface of the dowel die A dowel punch movably mounted up and down, and swingably provided on the unit block, with one end sandwiching the swing center positioned below the pressure pin,
The other end is located below the dowel punch, and when the upper die descends, the one end is pressurized by the pressing pin and swings,
A cam for pushing up the dowel punch at the other end.

Therefore, according to the dowel forming unit of the present invention, the work is held down by the dowel die and is stretched out by the dowel punch, so that the periphery of the part pressed by the dowel die during the forming is not distorted. I can do it. For this reason, dowel molding can be performed without leaving the original shape without distorting the work. In addition, since the work is pressed down from above by a dowel die and the dowel punch is pushed up from below to form the work, the work does not move up and down during the forming, so that the punching can be performed by the same press machine.

In the dowel forming unit according to the present invention, the cam has an arc-shaped sliding surface centered on the swing center, and the unit block comes into sliding contact with the sliding surface of the cam. It has an arc-shaped guide surface. Therefore, according to the dowel forming unit of the present invention, the sliding surface of the cam slides on the guide surface of the unit block, and the cam can perform a stable swinging motion. Further, for example, when the cam is pivotally supported at the swing center, a large load applied to the cam is received by the unit block, so that the load on the shaft portion can be reduced.

The dowel forming unit according to the present invention is characterized in that the cam is pivotally supported at the swing center with respect to a unit block. Therefore, according to the dowel forming unit of the present invention, the swinging motion of the cam does not shift due to the force acting on the cam, and a stable swinging motion can be performed around the supported shaft.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the dowel forming unit according to the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view showing a dowel forming unit of the present embodiment. This dowel forming unit (hereinafter, referred to as “dowel unit”) 30 is provided on the same press as the square hole unit 70 in place of the conventional dowel unit 60 shown in FIG. The dowel unit 30 is a lower die 5 of a press machine.
The unit block 3 is fixed to the unit block 3. Here, FIG. 4 shows the unit block 3 in FIG.
FIG. 3 is a diagram showing a cross section taken along line AA of FIG. The unit block 3 is composed of two upper and lower blocks. An arc cam 6 is supported by an upper pin 4 at the center of the arc by an anchor pin 8 and slidably inserted into a guide groove 7 formed in the lower block 5. Have been.

The arc cam 6 has an arc-shaped sliding surface 6A, and a guide groove 7 is formed with an arc guide surface 7A having the same radius of curvature as the sliding surface 6A. Therefore, the arc cam 6 is arranged such that the sliding surface 6A slides on the guide surface 7A and is mounted on the lower block 5 in which the guide groove 7 is formed. In this way, the load acting on the arc cam 6 from above is received by the lower block 5 on which the guide surface 7A is formed, and the arc cam 6 positioned at the center of curvature by the anchor pin 8 slides along the guide surface 7A, It is configured to perform a stable swinging motion. One end face of the arc cam 6 is urged by a cam return spring 15 so as to always return to the state of FIG. 1 in a free state.

In the unit block 3, a space 9 is formed at the joint between the upper block 4 and the lower block 5, as shown in FIG. The upper block 4 has a U-shape, and the bush 11 is fitted in a through hole of the upper bracket 4A, and the upper block 4 is slidably fitted therein so that the dowel die 1 is guided therein. The upper end flange portion of the dowel die 1 is urged by a spring 23 from below, and is applied to a piston rod 22 protruding from the tanker cylinder 21 in the upper die 52. On the other hand, on the opposite side of the upper block 4, the pressure pin 2 penetrates to the cam space 9 and is slidably fitted so as to be guided by the bush 12 fitted in the through hole. And the pressure pin 2
The upper end flange portion is urged by the spring 24 to be applied to the upper mold 52.

The dowel die 1 and the pressing pin 2 are parallel to each other, and the pressing end face 6B and the pressing upper end face 6C of the arc cam 6 are respectively provided.
Are provided at positions corresponding to both ends. That is, the load from the dowel die 1 and the pressure pin 2 acts on the same circumference around the anchor pin 8. The dowel die 1 and the pressure pin 2 have notches 1a,
2a is formed and is prevented from falling off by a stopper plate 25 fixed to the unit block 3. Further, the dowel punch 10 is fitted into the bush 13 fitted in the through hole so that the dowel punch 10 moves up and down coaxially with the dowel die 1 on the lower bracket 4B of the upper block 4 having the U shape. A hemispherical surface for dowel molding is formed on an end face of the dowel punch 10, and a corresponding hemispherical recess is formed on a lower end face of the dowel die 1.

Such a dowel unit 30 is provided in the upper die 52 and the lower die 51 of the same press as the square hole unit 70 (see FIG. 5) in the same manner as in the conventional example, and the dowel forming is performed simultaneously with the punching of the square hole. Here, the punching process is omitted,
Only the movement of the dowel unit 30 will be described. The dowel unit 30 firstly moves the dowel die 1 to the piston rod 22 of the tanker cylinder 21 with respect to the upper mold 52 before descending shown in FIG.
The pressing pin 2 is abutted on the upper mold 52. Therefore, the dowel die 1 is attached to the lower bracket 4B of the upper block 4.
The pressure pin 2 is also at the height of the upper block 4 and is not in interference with the arc cam 6. Therefore, as shown in FIG. 7, a perforated punch 73 is used.
The slide rail 80 is set on the dowel unit 30 and the square hole unit 70 so that the dowel die 1 is passed through as shown in FIG.

After the installation of the slide rail 80 is completed,
The upper die 52 is lowered by the driving of the press machine, and accordingly, the dowel die 1 and the pressure pin 2 are pressed down and similarly lowered to the state shown in FIG. When the upper die 52 descends to such a position, the dowel die 1 moves to the lower bracket 4B.
Is pressed down on the slide rail 80. Therefore,
The dowel die 1 is further restricted from descending. On the other hand, the pressure pin 2 that has hit the pressed end surface 6B of the arc cam 6 can be further lowered by the amount that the arc cam 6 swings. Therefore, when the upper die 52 further descends, the dowel forming is performed on the slide rail 80.

When the upper die 52 is lowered from the state shown in FIG. 2, the dowel die 1 is strongly pressed against the lower bracket 4B, but the reaction force is absorbed by the tanker cylinder 21, and the dowel die 1 presses the slide rail 80 against the lower bracket 4B. 1 is adjusted to a predetermined pressure. That is, the slide rail 80 is provided with the dowel punch 10 pushed up from below.
At this time, the pressurizing load is adjusted by the tanker cylinder 21 so that the dowel die 1 presses the slide rail 80 with a pressing force exceeding the forming load applied during the forming.

On the other hand, when the pressure pin 2 descends according to the upper mold 52, the pressing end face 6B of the arc cam 6 is pushed down, and the arc cam 6 swings on the guide surface 7A centering on the anchor pin 8. Is given. As shown in FIG. 3, the swinging arc cam 6 rises by pushing the pressing end face 6B down by the pressing pin 2 so that the other pressing upper end face 6C deflects the cam return spring 15 and moves up. Push up the dowel punch 10 hit by.

Then, the pushed dowel punch 10 pushes up the bottom surface 80B of the slide rail 80 pressed against the dowel die 1, and the slide rail 80 is stretched as shown in FIG. At this time, the bottom surface 80 </ b> B of the slide rail 80 is sufficiently pressed down by the dowel die 1. This is because the pressing load of the dowel die 1 that presses the slide rail 80 exceeds the forming load generated during processing by the tanker cylinder 21 as described above. Therefore, the slide rail 80
As a result, only the molded portion is stretched by raising the dowel punch 10 without distorting the periphery. In this way, dowel
The bottom surface 80B of the slide rail 80 projects along the shape of the concave surface 1A and the spherical surface of the dowel punch 10, and a hemispherical dowel 80A is formed.

The dowel 80A is attached to the slide rail 80.
After molding, the upper mold 52 is raised to return to the state shown in FIG. At this time, when the upper die 52 rises from the state shown in FIG. 3, the pressing pin 2 that has pushed down the arc cam 6 rises, and the pushing end surface 6B side becomes free. Therefore, the cam return spring 1 that urges the pressing upper end surface 6B
5, the circular cam 6 is urged, and the urging force causes the guide surface 7A to slide again in the reverse direction to return to the state shown in FIG. The dowel punch 10 pushed up by the circular cam 6 falls by its own weight following the downward movement of the upper end face 6C of the circular cam 6. Further, the dowel die 1 and the pressure pin 2 are pushed up by springs 23 and 24, respectively, and rise according to the upper mold 52. Then, the slide rail 80 on which the dowels are formed and the square holes are punched out
Is extracted from the dowel die 1 and the hole punch.

As described above, the dowel unit 3 of the present embodiment
According to No. 0, the dowel die 1 is used to press down the forming part of the work, and then the dowel punch 10 is pushed up on the work to form the work, so that the material other than the forming part is not stretched and distorted. . For this reason, it is possible to prevent the work from being opened by warping as in the conventional example shown by the broken line in FIG. 9, and it is possible to perform the dowel forming without causing a distortion that breaks the original shape of the work. In the case of the dowel unit 30, the slide rails 80 are always at the same height during a series of operations until the dowels are formed. This eliminates the inconvenience of bending the slide rail 80 during processing. Therefore, it is possible to provide a press working device in which the dowel unit 30 is integrated with the square hole unit, and by simultaneously performing the dowel forming and drilling, the number of working steps can be reduced, and the cost of working equipment using the same press machine can be reduced. Can be made possible.

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the arc cam 6 is pivotally supported by the anchor pin 8 so as to secure the swing center of the arc cam 6 performing the swing motion. However, as shown in FIG. The guide groove may be loaded in a free state without being supported. Since the arc cam 36 is pressed downward on the same circumference from the opposite direction by the pressing pin 2 and the processing pin 10 when swinging, the arc cam 36 does not float, and the guide surface 7A can be extremely accurately positioned. This is because a stable swinging motion can be performed by sliding. Also, for example, instead of placing the cam on the unit block and bringing the sliding surface and the guide surface into sliding contact with each other, a configuration in which the cam is pivotally supported and suspended may be employed. In this case, the shape of the cam need not be an arc cam having an arc surface as in the above embodiment.

[0027]

According to the present invention, when the upper die is lowered, the dowel die presses the work into the unit block, the pressing pin presses one end of the cam, and the dowel punch on the other end across the swing center is the cam. The dowel punch is pushed up by the swing of the dowel, and the overhanging dowel punch is used to perform the overhang forming of the work, so that a dowel forming unit capable of dowel forming without breaking the original shape of the work is provided.
In addition, it has become possible to provide a dowel forming unit capable of performing punching with the same press.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a dowel molding unit according to the present invention at the start of molding.

FIG. 2 is a cross-sectional view showing an embodiment of the dowel forming unit according to the present invention, which is in the process of being formed.

FIG. 3 is a cross-sectional view showing one embodiment of a dowel forming unit according to the present invention at the time of completion of forming.

FIG. 4 is a diagram showing a section AA of the unit block 3 in FIG. 1;

FIG. 5 is a sectional view showing another embodiment of the dowel forming unit according to the present invention.

FIG. 6 is a cross-sectional view showing a conventional dowel molding unit and a press square hole unit when molding is completed.

FIG. 7 is a cross-sectional view showing a conventional dowel forming unit and a press processing square hole unit at the start of forming.

FIG. 8 is a cross-sectional view showing a conventional dowel forming unit and a press square hole unit during forming.

FIG. 9 is a view showing a slide rail.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dowel die 2 Pressure pin 3 Unit block 6 Arc cam 7 Guide groove 10 Processing pin 21 Tanker cylinder 30 Dowel forming unit 51 Lower die 52 Upper die

Claims (3)

[Claims] 1. A unit block fixed to a lower die of a press machine, on which a work is placed, and a concave surface for dowel forming is formed on a lower surface, and is moved up and down according to the upper die of the press machine, and when it is lowered, A dowel die for clamping a work with a unit block, a pressing pin that moves up and down according to the upper mold of the press machine, a dowel punch movably attached to the unit block up and down corresponding to the concave surface of the dowel die, and the unit When the upper die is lowered, the pressure pin is provided when the upper die is lowered, while the other end is positioned below the dowel punch with one end sandwiching the center of the swing being positioned below the press pin. And a cam which pushes up at one end to push up a dowel punch at the other end. 2. The dowel forming unit according to claim 1, wherein the cam has an arc-shaped sliding surface centered on the swing center, and the unit block has a sliding surface of the cam. A dowel forming unit having an arc-shaped guide surface with which a sliding contact is made. 3. The dowel forming unit according to claim 1, wherein the cam is pivotally supported by a unit block at the swing center.