JPH11347654A - Double cam unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mount various cam units to form a negative angle part on a die in the cam unit of the die, for example, in the double cam units to mount the cam unit in a press die to bend an edge part of a body frame for an automobile. SOLUTION: A double cam unit 1 to form a negative angle part of a formed part support a lower die 27 for a negative angle part A and a cam driver 6 of a cam unit 11, the lower die 27 is advanced to the negative angle part A when a movable die 20 is moved downward in an interlocking manner with the vertical movement of the movable die 20, the lower die 27 is evacuated from the negative angle part A when the movable die 20 is moved upward, and the double cam unit comprises a slider 2 for the lower die which is slidable in a specified direction on a fixed die 24, and a driver 7 for the lower die which is engaged with a cam receiving member 2b fixed to the movable die 20 and provided on the slider 2, and slides the slider 2 for the lower die with a specified movement at least when the movable die 20 is moved downward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die cam unit, and more particularly to a double cam unit for mounting a cam unit in a press die for bending an edge of a body frame for an automobile.

[0002]

2. Description of the Related Art Conventionally, when a large metal plate such as an automobile body is molded with a lower fixed mold and an upper movable mold in a vertical direction, holes are formed in the side surfaces of the molded product. To drill or bend the edges, see FIG.
As shown in the figure, the cam unit 1a is attached to a mold. For example, the cam driver 21 of the movable mold 20 is provided with a tapered surface 21a, and the cam slider 22 having a tapered surface 22a abutting on the tapered surface 21a and sliding on the base 24 of the fixed mold in a predetermined range in the left-right direction. And a tool 23 (for example, for drilling) is fixed to the side surface of the cam slider 22.

The cam slider 22 slides on the base 24 in the left-right direction by the vertical reciprocating movement of the movable mold 20, and the side surface of the molded product 25 is machined by the tool 23.

When the cam driver 21 is moved upward together with the movable mold 20, the cam slider 22
It is returned to the original position by the urging force of the elastic body 26 such as a spring constantly urging to the left.

In the molding of such a molded article such as an automobile body, as shown in FIG. 9, when the edge of the molded article 25 is bent inward at an acute angle to form a negative angle portion, for example, a cam slider is used. After being bent by a tool or the like fixed to the mold 25, the lower mold 27 must be released to the left so that the molded product 25 can be ejected upward and removed from the mold.

[0006]

SUMMARY OF THE INVENTION A molded product 25 using the above-mentioned mold.
In order to release a mold at a negative angle portion such as the edge portion, a special mold must be provided for each molded product having a different shape. for that reason,
Due to the increase in the number of parts of the mold, the cost of manufacturing and managing the mold is increased, and furthermore, it takes time to set up the mold. The present invention has been proposed to solve such a problem.

[0007]

The gist of the present invention for solving the above-mentioned problems of the double cam unit according to the present invention is to form a negative angle portion of a molded product by attaching the fixed cam and the movable mold to each other. In addition to supporting the lower mold for the negative angle portion and the cam driver of the cam unit, the lower mold is moved when the movable mold is moved downward in conjunction with the vertical movement of the movable mold. A lower mold slider that is advanced to the negative angle portion, retracts the lower mold from the negative angle portion when moving the movable mold in the upward direction, and slides on the fixed mold in a predetermined direction,
The lower mold slider is fixedly attached to the movable mold, engages with a cam receiving member provided on the lower mold slider, and slides the lower mold slider at a required movement amount at least when the movable mold is moved in a downward direction. It consists of a lower mold driver.

The slider for the lower die is always urged by an elastic member that takes a reaction force to a part of the fixed die in a direction to retract the lower die from the negative angle portion; An upper spacer interposed for fixing the cam slider of the cam unit to the movable mold, and a lower spacer interposed for fixing the cam driver of the cam unit to the lower mold slider are provided, and the upper spacer and the lower spacer are provided. Includes that the machining angle of the tool for machining the negative angle portion of the molded product is changed by inclining the mounting surface in parallel and inclining.

According to the double cam unit of the present invention, it is possible to easily construct a double cam mechanism for forming a negative angle portion at an edge of a molded product. The lower mold slider is slid in conjunction with the up and down movement of the movable mold, and at the time of molding the negative angle portion, slides in a predetermined direction to advance the lower mold into the negative angle portion, thereby moving the negative angle portion. When the molded product is removed from the mold, it is slid back to its original position and the lower mold is retracted from the negative angle part, allowing the molded product to move in the upward direction (mold removal direction). And can be removed from the mold.

Further, when the movable mold moves upward by an elastic member which takes a reaction force to a part of the fixed mold, the lower mold slider automatically slides in a direction for retracting the lower mold from the negative angle portion. Be moved. Further, the processing angle of the tool of the suspension cam unit can be set or changed to a desired angle by the upper spacer and the lower spacer, so that the edge of the molded product can be easily formed into a desired negative angle portion. Becomes

[0011]

Next, a double cam unit according to the present invention will be described with reference to the drawings. Note that, for easy understanding of the invention, portions corresponding to the conventional example are denoted by the same reference numerals as the conventional example.

The double cam unit 1 according to the present invention is a unit for mounting a cam unit 11 that can be independently replaced with a mold, for example, a hanging cam unit.
As shown in FIG. 1, for example, in a vertical direction, a molded product 2 is formed by a lower fixed die 24 and an upper movable die 20.
A negative angle portion (see FIG. 7) is formed at the edge of the fifth member.

As shown in FIGS. 1 and 2, the fixed die 24 has a lower die slider 2 for the double cam unit 1. As shown in FIG.
Are slidably provided in the left-right direction. As shown in FIGS. 3 and 4, the structure for allowing the sliding is such that a pair of guide plates 3
Are erected in two sets, and each upper part is bent in an inverted L-shape.

The sliding guides 2a, 2a projecting from both side walls of the body of the lower die slider 2 in the front-rear direction.
And the guide plates 3 are engaged with each other, so that the movement of the lower mold slider 2 in the upward direction and the front-rear direction is restricted, and only the left-right sliding of the lower mold slider 2 is allowed. It has become.

At the right end of the lower die slider 2, a stopper (for example, made of urethane, etc., for positioning after the lower die slider is moved and for positioning the cam slider 6 in the left and right direction of the cam unit 11) is provided. 4), and a cam receiving member 2b for receiving an action of moving the movable mold 20 in the left-right direction in conjunction with the vertical movement of the movable mold 20 is provided upright. A guide taper 2d is provided at the upper left corner of the cam receiving member 2b.

At the left end of the lower die slider 2, there is provided a stopper 4 for positioning when the lower die slider 2 returns to the original position, and a lower die 27 forming a negative angle portion. Is provided with a lower mold mounting member 2c.

The lower mold slider 2 slides on a flat slide base 24a, 24b, 24c provided intermittently in the left-right direction on the upper surface of the fixed mold 24. is there.

Further, a compression coil spring or the like is accommodated in a recess provided in the fixed mold 24 at a position below the lower die slider 2 via the spring receiving seats 2e, 2e, and takes a reaction force on the side wall of the recess. With the urging force of the elastic member 28, the elastic member 28 is always pressed to the left and returned to the original position.

The width a of the lower die slider 2 is, for example, 200 mm, 400 mm or the like, and is prepared according to the size of a molded product 25 such as an automobile body.

The lower spacer 5 is fixed on the main body of the lower die slider 2. The cam driver 6 of the suspension cam unit 11 is fixed to the lower spacer 5 with a bolt or the like.

On the other hand, a lower die driver 7 which abuts on the left side surface of the cam receiving member 2b of the slicer 2 and moves it rightward is fastened by a bolt or the like to the movable die 20 and is vertically provided. ing.

At the upper position of the cam slider 6, an upper spacer 8 is fixed to the lower surface of the movable mold 20, and a cam base 9 is fixed to the lower surface of the upper spacer 8 by bolts or the like. The cam slider 10 of the suspension cam unit 11 is provided slidably.

A suspension cam unit 11 is constituted by the cam slider 10 and the cam driver 6, and forced return followers 10a and 6a are fixedly engaged with each other as shown in FIG.

The cam slider 10 has a molded product 25
The tool 12 for processing the negative angle portion A is fixed.

As described above, with respect to the fixed mold 24 and the movable mold 20, the double mold composed of the lower mold slider 2 and the lower mold driver 7, and the lower spacer 5 and the upper spacer 8 are provided. By providing the cam unit 1, the hanging cam unit 11 can be attached to the double cam unit 1 to easily form the negative angle portion A in the molded product 25.

That is, the manner in which the negative angle portion A of the molded product 25 is formed will be described. The state shown in FIG.
When the movable mold 20 moves downward from the state shown in FIG. 1, the lower mold driver 7 descends integrally, and the cam receiving member having the guide taper 2d in contact with the tapered surface 7a thereof. 2b is quickly pushed rightward.

The lower die slider 2 is guided by the guide plate 3 via the slide guide 2a, and is forcibly forced to the right against the urging force of the elastic members 28, 28 in the right direction. a), b) and c) are slid and moved, and the leading end surface of the right stopper 4 comes into contact with the upright right wall surface 24d of the fixed mold 24 and stops.

At the same time, the cam rider 6 on the lower spacer 5 also stops after moving to the right. Also,
The lower die 27 set on the lower die mounting member 2c on the left side of the lower die slider 2 moves rightward and is set at a predetermined position below the molded product 25. Thereafter, the cam driver 6 in the cam unit 11 is positioned in the linear portion 7b of the lower die driver 7 without the lower die slider 2 sliding.

When the movable mold 20 further descends, the cam base 9 descends, and the cam slider 10 slides along the tapered surface 6b of the cam driver 6 contacting the cam surface 10,
At the same time, the tool 12 is pushed obliquely leftward. Thereby, the edge of the molded product 25 is bent inward, and the negative angle portion A is formed.

After the movable mold 20 has been lowered by a predetermined amount, it starts moving upward, and the cam base 9 and the cam slider 10 are also pulled upward. At this time, the relationship between the lower die driver 7 and the cam receiving member 2b in the movable die 20 is such that the vertical side surfaces are in contact with each other and the linear portion 7b and the linear portion 2e are in contact with each other. Is prevented from moving in the left-right direction. Therefore,
At this time, the cam driver 6 of the cam unit 11 is fixed in position and does not move leftward.
7 also exists in the negative angle portion A.

Cam slider 1 pulled up
0 moves obliquely upward along the tapered surface 6b as shown in FIG. 6 by engagement with the forced return followers 10a and 6a. At the same time, the tool 12 fixed to the cam slider 10 also retreats obliquely upward and is separated from the negative angle portion A.

Thereafter, the movable mold 20 is further raised, and as shown in FIG.
Comes into contact with the guide taper 2d of the cam receiving member 2b, the slider 2 for the lower die is moved leftward by the urging force of the elastic member 28, and the stopper 4 provided on the left end face of the slider 2 is fixed to the fixed die. 24 is in contact with the left wall surface 24e. Thus, the lower mold slider 2 is returned to the original position.

The lower die 27 is separated from the negative angle portion A by the leftward movement of the lower die slider 2 as shown in FIG. As a result, since the lower mold 27 is retracted to the left side, it does not hinder the upward movement of the negative angle portion A. Thereafter, the molded product 25 is pushed upward by an ejector or the like and is removed.

As described above, the fixed mold 24 and the movable mold 20
Is combined with the double cam unit 1 according to the present invention, so that the cam driver 6 of the suspension cam unit 11 slides and the lower mold 27 is moved to the negative angle portion A of the molded product 25. It will be able to appear and disappear freely. The lower die 27 is changed to various ones having a required shape, and the lower die mounting member 2c of the double cam unit 1 is formed.
A molded product 2 having various negative angle portions A
5 is easily formed.

The lower spacer 5 on which the cam driver 6 is mounted and the upper spacer 8 on which the cam base 9 is fixed.
Although the mounting surfaces are horizontal in the state shown in FIG. 1, for example, by tilting them parallel to + 5 ° or -5 ° in parallel, the cam slider 10 in the suspension cam unit 11 is inclined. The slip angle changes, and accordingly, the processing angle of the tool 12 can be changed. Therefore, in the double cam unit 1 according to the present invention, the machining angle of the tool 12 of the cam unit 11 is changed to the negative angle portion A of the molded product 25.
Can be easily adjusted to a desired shape, and various negative angle portions can be flexibly adapted.

[0036]

As described above, the double cam unit according to the present invention is mounted on a fixed mold and a movable mold to form a negative angle portion of a molded product. While supporting the lower mold for the cam unit and the cam driver of the cam unit, in conjunction with the up and down movement of the movable mold, the lower mold is advanced to the negative angle portion when moving down the movable mold, When moving the movable mold upward, the lower mold is retracted from the negative angle portion, and a lower mold slider slidable on the fixed mold in a predetermined direction, and is fixed to the movable mold,
A lower-type driver that engages with a cam receiving member provided on the lower-type slider and slides the lower-type slider by a required movement amount at least when the movable die moves in a downward direction. In addition, it is possible to easily construct a double cam mechanism for forming a negative angle portion at the edge of the molded product. The lower mold slider is slid in conjunction with the up and down movement of the movable mold, and at the time of molding the negative angle portion, the lower mold slides in a predetermined direction to advance the lower mold into the negative angle portion, thereby forming a negative angle. Parts can be molded, and when removing molded products,
It has an excellent effect that the lower mold is retracted from the negative angle portion by being slid and returned to the original position, and the molded article can be moved upward (in the removing direction) to be removed. Things.

The lower mold slider is always urged by an elastic member that takes a reaction force to a part of the fixed mold in a direction to retract the lower mold from the negative angle portion. An upper spacer interposed for fixing the slider to the movable mold, and a lower spacer interposed for fixing the cam driver of the cam unit to the lower mold slider are provided, and the mounting surfaces of the upper spacer and the lower spacer are parallel. Since the machining angle of the tool that processes the negative angle part of the molded product can be changed by tilting it, when the movable mold moves upward, the lower mold slider moves in the direction to retract the lower mold from the negative angle part Is automatically slid, and the machining angle of the hanging cam unit tool can be set or changed to a desired angle by the upper and lower spacers. Parts are those excellent effects that can be easily molded into desired negative angle portion.

[Brief description of the drawings]

FIG. 1 is a front view showing a use state of a double cam unit 1 according to the present invention.

FIG. 2 is a plan view of a lower die slider 2 in the double cam unit 1 according to the present invention.

FIG. 3 is a right side view of a lower die slider 2 and a lower die driver 7 in the double cam unit according to the present invention.

FIG. 4 is a left side view of the lower die slider 2 in the double cam unit 1 according to the present invention.

FIG. 5 is a sectional view showing the structure of forced return followers 6a and 10a in the suspension cam unit 11.

FIG. 6 shows a double cam unit 1 according to the present invention.
After the movable mold moves upward, the lower mold slider 2
FIG. 7 is an explanatory diagram showing a state in which the elastic member returns to the original position by the urging force of the elastic member.

FIG. 7 shows a double cam unit 1 according to the present invention.
FIG. 4 is an explanatory diagram showing an initial state and a state in which a lower mold driver 7 has moved upward.

FIG. 8 is a front view schematically showing an entire mold including a cam unit 1a according to a conventional example.

FIG. 9 is an explanatory view showing a molding state of a negative angle portion of the molded product according to the conventional example.

[Explanation of symbols]

1 Double cam unit, 2 lower type slider, 2a
Tapered surface, 2b cam receiving member, 2c lower die mounting member, 2d guide taper, 2e spring receiving seat, 3 guide plate, 4 stopper, 5 lower spacer, 6
Cam driver, 6a Forced return follower, 6b Tapered surface, 7 Driver for lower die, 8 Upper spacer, 9
Cam base, 10 cam slider, 10a forced return follower, 10b cam surface, 11 cam unit,
12 tools, 20 movable molds, 24 fixed molds, 24
a, 24b, 24c sliding base, 25 molded product, 27
Lower mold, 28 elastic members, A negative angle part.

Claims (3)

[Claims] 1. A negative mold for forming a negative angle portion of a molded product by being mounted on a fixed mold and a movable mold, supporting a lower mold for the negative angle portion and a cam driver of a cam unit. In conjunction with the vertical movement of the movable mold, the lower mold advances to the negative angle portion when the movable mold moves downward, and the lower mold moves negatively when the movable mold moves upward. A lower mold slider retractable from the angle portion and slidable on the fixed mold in a predetermined direction; and a cam receiving member fixed to the movable mold and provided on the lower mold slider. A driver for the lower mold that slides the slider for the lower mold at a required movement amount at least when the movable mold moves in the downward direction. 2. The lower mold slider is always urged by an elastic member that takes a reaction force to a part of the fixed mold in a direction to retract the lower mold from the negative angle portion. Item 2. The double cam unit according to Item 1. 3. An upper spacer interposed to fix the cam slider of the cam unit to the movable mold, and a lower spacer interposed to fix the cam driver of the cam unit to the lower mold slider. 2. The double cam unit according to claim 1, wherein a machining angle of a tool for machining a negative angle portion of the molded product is varied by inclining the mounting surface of the molded product and the lower spacer in parallel with each other. 3.