JP2586481Y2 - Clamping device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device for fixing a die in, for example, a press machine.

[0002]

2. Description of the Related Art As shown in FIGS. 8 and 9, this type of conventional clamping device has a main body 1 integrally formed with a T-groove engaging portion 2 and a clamp fitting supporting portion 3. As shown in FIG. A hydraulic drive unit 4 is provided on a right side surface of the main body 1, and a clamp 5 is pivotally supported on a clamp support 3 by a pivot 6. As shown in FIG. 8, when the hydraulic pressure is supplied to the hydraulic drive unit 4 in a state where the T-slot engaging portion 2 is engaged with the T-slot 7,
The driven portion 8 of the clamp 5 is pushed down, and the holding portion 9 is pressed.
Side rises. As a result, the pressed portion 11 (attachment portion) of the press die 10 is, as shown in FIG.
It is pressed to 3 and fixed.

[0003] Such a clamping device is a press die 10
When the pressed portion 11 is pressed, as shown in FIG. 8, the pressing portion 9 rotates clockwise about the pivot 6, so that the pressing portion 9 moves upward toward the slide 12 side. And a horizontal minute speed approaching the main body 1 side. However, since the pressing portion 9 is in line contact with the pressed portion 11, the pressed portion 11
Has a very large friction coefficient, and therefore, it is difficult for the sliding between the holding portion 9 and the pressed portion 11 to occur. As a result, the clamping device is moved by the distance in the horizontal direction in which the holding portion 9 moves to the main body 1 side. It moves to the press die 10 side along the T groove 7. That is, as shown in FIG. 11, the clamp device moves toward the press die 10 by a distance i _{3 in} which the pressing portion 9 moves toward the main body 1. Therefore, in the unclamped state shown in FIG. 8, while the distance between the press die 10 and the main body 1 is i _4, in the clamped state shown in FIG. 9, the press mold 1
The distance between 0 and the main body 1 is (i ₄ −i ₃ ).

[0004]

[Problems to be Solved by the Invention] By the way, press die 1
10 is fixed to the slide 12, first, as shown in FIG. 10, the clamp device is set in the T-groove 7 so that the holding portion 9 of the clamp device is directly below the pressed portion 11 of the press die 10.
, And the front surface 14 of the clamp device is brought into contact with the side surface 15 of the pressed portion 11. In this state, it is general to supply hydraulic pressure to the hydraulic drive unit 4 to raise the presser unit 9, thereby fixing the press die 10.

However, as shown in FIG. 10, in an unclamped state (there is a gap h ₁ between the slide lower surface 13 and the press die upper surface 16), the front surface 14 of the clamp device and the side surface 15 of the pressed portion 11 are in contact with each other. Are in contact with each other, even if the clamp 5 is driven by the hydraulic drive 4 and receives a clockwise rotation force, as long as the presser 9 does not slide with respect to the pressed portion 11 (horizontal). As a result, there is a problem that the press die 10 cannot be raised and cannot be fixed to the slide 12, as shown in FIG.

When the pressing portion slides with respect to the pressed portion 11, the pressing portion 9 and the pressed portion 11 are in contact with each other at a high pressure. There is the problem that the contact surfaces are damaged and their life is shortened.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a clamp device that can securely fix a mold or the like to a base.

[0008]

SUMMARY OF THE INVENTION The present invention has an engaging portion which engages with a base for fixing a mold or a workpiece (hereinafter, simply referred to as "mold or the like"). A clamp body provided movably, a clamp provided on the body and formed with a holding portion capable of moving forward and backward in both directions toward the base surface and the body, and provided to drive the clamp. A fluid pressure driving unit, wherein the friction coefficient of the base with respect to the engagement portion is formed to be smaller than the friction coefficient of the pressed portion such as the mold with respect to the pressing portion; The distance between the side surface of the main body and the mold in the unclamped state before fixing the mold or the like to the base is such that the mold or the like is fixed to the base after the pressing portion starts to contact the pressed portion. Between the presser parts A biasing means for biasing the main body in a direction to separate the main body from the mold or the like is provided on the main body or the mold or the like so as to be wider than a moving distance toward the body. .

[0009]

According to the present invention, when the mold or the like is fixed to the base, first, the engaging portion of the clamp device is engaged with the base and moved to the mold or the like along the base. At this time, an urging means is interposed between the clamp device and the mold and the like, and the main body of the clamp device and the mold and the like are positioned at a predetermined interval by the urging means. Next, when the fluid pressure driving unit is driven to change from the unclamped state to the clamped state, the pressing unit moves in the direction by the partial speed in the direction toward the base, and this movement moves the mold or the like toward the base. It can be moved by pressing. Then, the holding portion also moves relatively in that direction by the minute speed in the direction toward the main body, and the clamp device approaches the mold or the like by the distance of the movement against the urging force of the urging means. Moving. Then, at the same time that the pressing portion presses the base against the mold or the like, the movement is stopped before the main body of the clamp device comes into contact with the mold or the like, and the mold or the like can be brought into the clamped state.

Since the friction coefficient of the base with respect to the engaging portion of the clamp device is formed to be smaller than the friction coefficient of the pressed portion such as a mold with respect to the pressing portion of the clamp device, the base is engaged with the engagement portion. Although the sliding occurs between the pressing portion and the pressing portion, the sliding does not occur between the pressed portion and the pressing portion, whereby the clamp device moves while sliding toward the mold or the like as described above.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 is a main body, 5 is a clamp, 4 is a drive unit, and 33 is an urging means. The clamp device 19 is used for fixing the press die 10 to the lower surface of the slide 12 of the press machine 18 shown in FIG. Parts equivalent to those in the conventional example are denoted by the same reference numerals.

As shown in FIGS. 1 and 3, the main body 1 has a T-groove engaging portion 2 projecting upward from the upper surface, and has a forked supporting portion 3 for supporting a clamp 5 at a lower portion. ing. T
The groove engaging portion 2 has a T-shaped cross section that engages with the T groove 7 provided on the lower surface of the slide 12, and is formed to be slightly longer than the width of the main body 1 in FIG.

As shown in FIG. 1, the clamp 5 is formed in the shape of a lever, and is rotatably supported by a pivot 6 provided on the support portion 3 in the middle.
The left end of the metal fitting 5 protrudes from the front surface 14 of the main body 1, and a holding portion 9 is formed on the upper surface thereof. A groove 20 is formed on the upper surface of the right end in parallel with the pivot 6, and a rotatable driven part 8 is fitted in the groove 20. A guide surface 23 that contacts an inclined surface 22 of a wedge-shaped member 21 described later is formed on an upper portion of the driven portion 8. Note that the sliding friction coefficient μ ₂ of the upper surface 24 of the T groove 7 with respect to the lower surface of the T groove engaging portion ₂ is determined by the pressing portion 9 of the clamp 5.
It is formed to be smaller than the coefficient of sliding friction mu ₁ of the lower surface 25 of the pressed portion 11 of the press die 10 against.

The drive section 4 is a hydraulic cylinder formed separately from the main body 1 as shown in FIG. Then, the wedge-shaped member 21 provided in connection with the piston 26 is inserted into the inside of the support portion 3, and the inclined surface 22 comes into contact with the guide surface 23 of the driven portion 8. In FIG. 1, 27 is a return piston, 28 is an O-ring, 29 and 30 are pressure oil supply / discharge holes, 31 is a return spring, and 32 is a stopper for the return piston 27 to come off.

As shown in FIG. 1, the biasing means 33 is, for example, a rubber-like elastic body in the form of a cup, and is fastened by a bolt 34 in a recess provided in the front surface 14 of the main body 1. Then, the distal end portion of the biasing means 33 protrudes from the front face 14 of the main body 1 of the i ₄ by the length.

When using the clamping device 19 constructed as described above, first, as shown in FIGS. 1 and 6, the T-groove 7 is formed in the T-groove 7 provided on the slide lower surface 13 of the press machine 18. Part 2 is fitted, and clamp device 19 is
To move to a position approaching the pressed portion 11 of the press die 10. At this time, the movement of the clamp device 19 stops at a position where the tip end surface of the urging means 33 contacts the side surface 15 of the pressed portion 11. In this state, i is between the front surface 14 of the clamp device 19 and the side surface 15 of the pressed portion 11.
The gap ₄ is automatically generated, and the pressing portion 9 of the clamp 5 is located below the pressed portion 11 of the press die 10.

Next, when pressure oil is supplied from the supply / discharge hole 29 and driven, the wedge-shaped member 21 moves to the left in FIG. 1 together with the piston 26, and the inclined surface 22 of the wedge-shaped member 21 The driven part 8 is pressed down against the spring force, and the clamp 5 is rotated clockwise about the pivot 6. As a result, the presser 9 rises and relatively moves toward the main body 1. At this time, as the presser 9 rises, the presser 9 comes into contact with the lower surface 25 of the pressed portion 11 of the press die 10, and the press die 10 is lifted in this contact state. Then, in a state where the weight of the press die 10 is applied to the pressing portion 9, the clamp device 19 is moved by the relative movement of the pressing portion 9 toward the main body 1 side (the rightward movement in FIG. 1). It moves i ₃ in the direction approaching the press die 10 (movement to the left in FIG. 1) against the force. In this way, as shown in FIG.
The operation of fixing the press die 10 to the lower surface 13 of the slide 12 by pressing the pressed portion 11 against the lower surface 13 of the slide 12 ends, and the clamped state is established in this state.
In this clamped state, the clamp device 19 is moved by i ₃ toward the press die 10. Therefore, the distance between the front surface 14 of the clamp device 19 and the side surface 15 of the pressed portion 11 is (i ₄ − i ₃ ).

That is, the clamping device 19 is formed such that the sliding friction coefficient μ ₂ of the upper surface 24 of the T groove 7 is smaller than the sliding friction coefficient μ ₁ of the lower surface 25 of the pressed portion 11 of the press die 10. Thus, when the holding portion 9 relatively moves toward the main body 1 side, the holding portion 9 of the clamp 5
No slippage occurs between the pressurized portion 11 of the press die 10 and a slippage occurs between the lower surface of the T-groove engaging portion 2 and the upper surface 24 of the T-groove 7. Move toward 10 side. Since the pressing portion 9 is in line contact with the pressed portion 11, the contact pressure per unit area is high, and no slip occurs at this portion, so that the respective contact surfaces are damaged and worn. Therefore, the life of this portion can be extended as compared with the related art. Since the lower surface of the T-groove engaging portion 2 is in surface contact with the upper surface 24 of the T-groove 7, the contact pressure per unit area is low. Has little damage and wear.

The clamp device 19 is connected to the press die 10 and the clamp device 19 at a predetermined interval i _{4 in} advance.
Is provided on the lower surface of the slide 12 so as to be able to be disposed on the lower surface of the slide 12. With this configuration, the pressing die 10 in the unclamped state is fixed until the clamp 12 is completely fixed to the slide 12. And i ₃ (i ₃ <i ₄ ) in the direction in which the clamp device 19 faces the press die 10.
Only can move reliably. Thereby, the press die 10 can be reliably moved in the direction toward the slide 12, and as a result, the press die 10 can be reliably fixed.

Next, the force acting on each of the above parts of the clamp device 19 will be described with reference to FIG. The frictional resistance f ₁ acting on the holding portion 9 of the clamp 5 is

F ₁ = μ ₁ · W (1)

## EQU1 ## Here, μ ₁ is the lower surface 2 of the pressed part 11 of the press die 10 with respect to the holding part 9 of the clamp 5.
The coefficient of sliding friction W of 5 is the force by which the presser 9 pushes up the press die 10.

The frictional resistance f acting on the lower surface of the T-groove engaging portion 2
₂ is

F ₂ = μ ₂ · W (2)

## EQU1 ## Here, μ ₂ is the coefficient of sliding friction of the upper surface 24 of the T groove 7 with respect to the lower surface of the T groove engaging portion 2. Here, μ ₁ (= 0.4 to 0.6)> μ ₂ (= 0.1 to
0.15), so that f ₁ > f ₂ , whereby the pressing portion 9 of the clamp 5 does not slip and the T-groove engaging portion 2 of the clamp device 19 slips.

Next, when the frictional resistance f ₄ when the clamp device 19 moves toward the press die is calculated,

F ₄ = (μ ₂ + μ ₃ ) · W + f ₃ (3)

However, μ ₃ indicates that the pressing portion 9 is
The rolling friction coefficient when rolling on the lower surface 25 of the pressed portion 11 is 0.05 to 0.1. f ₃ is,
The elastic reaction force of the urging means 33, f ₃ / W ≒ 1/100
0.

Therefore, while the conventional frictional resistance in the horizontal direction has a resistance of f ₁ shown in the equation (1) when the press die 10 is clamped in the state shown in FIG. ) Can be reduced to f ₄ shown in FIG. Note that when calculating the f ₁ and f ₄ by substituting the frictional resistance and elastic reaction in Equation (1) and (3), f ₄ is about 40% to 60% of the f _1.

[0030] Thus, the can be made smaller than the conventional horizontal frictional resistance, possibility of horizontal force F _x of the driving force F of the driving unit 4 shown in FIG. 4 overcomes the frictional resistance f ₄ Can be made higher than before, and the press mold 10
Can be reliably pushed up and fixed to the slide 12. In contrast, in the prior art, if the frictional resistance f ₁ is greater than the horizontal force F _x is the horizontal component force F _x frictional resistance f ₄
Cannot be pushed over and the press die 10 cannot be pushed up.
2 cannot be fixed.

In the above embodiment, a rubber-like elastic body is used as the urging means 33.
The configuration shown in FIGS. 5A, 5B, and 5C may be applied. The biasing means shown in FIG. 5 (a) is provided on the front surface 14 of the main body 1 of the clamp device 19 as in the above embodiment, and the compression coil spring accommodated in a recess formed in the front surface 14 is provided. 35 and a pressing member 36 urged outward by the coil spring 35.
The tip of the pressing member 36 protrudes from the front surface 14 of the main body 1 by i ₄ . Since the biasing means 33 operates in the same manner as in the above embodiment, its description is omitted.

The urging means shown in FIG.
In the same manner as in the above embodiment, it is provided on the front surface 14 of the main body 1 of the clamp device 19, and the base end portion is screwed to the bottom 38 of the recess formed in the front surface 14. Both ends 39 of the leaf spring 37 are i ₄
, And acts in the same manner as in the above embodiment, and a description thereof will be omitted. FIG. 5B is a cross-sectional view of the urging means as viewed from above, and FIG. 5C is a cross-sectional view of the urging means as viewed from the side.

In the above-described embodiment, the use example of fixing the press die 10 to the slide 12 of the press machine 18 has been described. In addition, in the bolster of the press machine 18 and the injection molding machine, a fixed plate, a moving plate, and a milling machine are used. Can be used for fixing a mold or a workpiece to a base such as a bed.

The bolster is described with reference to FIGS. 6 and 7. Referring to FIGS. 6 and 7, a die lifter 42 is attached to a T-shaped groove 41 of a bolster 40, and a press die 43 is supported by the die lifter 42. ing. That is, the press die 43 is lifted by the lift spring 44 of the die lifter 42 such that the lower surface of the press die 43 and the upper surface of the bolster are located at a predetermined interval. As described above, when the press die 43 in the unclamped state supported by the die lifter 42 is brought into the clamped state, the urging means 33 of the clamp device 19 is moved to the pressed portion of the press die 43 as in the above-described embodiment. The clamp device 19 is set in the contact position and the clamp device 19 is operated. On this occasion,
By moving the holding portion 9 of the clamp 5 toward the bolster 40, the pressed portion 11 of the press die 43 can be pressed and moved toward the bolster 40 against the spring force of the lift spring 44. It can be fixed by pressing. And, as in the above embodiment,
The pressing die 43 and the clamping device 19 are pressed by the urging means 33.
Is located at a predetermined distance i ₄ from the main body 1 of the press tool 4, so that the clamping device 19
It can slide in the direction toward the third side. That is, since the clamp device 19 allows the movement in the direction toward the press die 43, the press die 43 can be securely fixed to the bolster 40.

In the above-described embodiment, the urging means 33 is provided on the front surface 14 of the main body 1 of the clamp device 19.
May be provided on the side surface 15.

[0036]

The clamp device of the present invention has a structure in which biasing means is provided so that the main body of the clamp device and a mold or the like can be arranged on a base at a predetermined distance from each other. With this configuration, the clamp device can be more reliably moved in the direction toward the mold or the like than before until the clamp or the like in which the mold or the like in the unclamped state is completely fixed to the base. As a result, the mold and the like can be more reliably moved to the base side than before, and as a result, the mold and the like can be more securely fixed to the base than before.

Since the friction coefficient of the base with respect to the engaging portion of the clamp device is formed to be smaller than the friction coefficient of the pressed portion such as a mold with respect to the pressing portion of the clamp device, the pressed portion and the pressed portion are formed. No slippage occurs between the pressing portion and the contact portion between the pressing portion and the pressed portion, thereby preventing the contact surface between the pressing portion and the pressed portion from being damaged. effective.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view showing an unclamped state of a clamp device according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a clamp state of the clamp device of the embodiment.

FIG. 3 is a rear view of the clamp device of the embodiment.

FIG. 4 is a vector diagram showing a force acting on a holding portion of the embodiment and a frictional resistance generated in each portion of the clamp device.

FIG. 5 is a sectional view showing another example of the urging means of the embodiment.

FIG. 6 is a side view of a press machine to which the clamp device of the embodiment is applied.

FIG. 7 is a sectional view of a die lifter attached to a bolster of the press machine of the embodiment.

FIG. 8 is a vertical sectional side view showing an unclamped state of a conventional clamping device.

FIG. 9 is a vertical sectional side view showing a clamped state of the conventional clamp device.

FIG. 10 is a vertical sectional side view showing an unclamped state of the conventional clamping device.

FIG. 11 is a view showing a state of movement of a holding portion of the conventional clamp device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 T-groove engaging part 4 Drive part 5 Clamp fitting 9 Holding part 10 Press type 11 Pressed part 12 Slide 15 Side surface (pressed part) 33 Urging means

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Norio Teru Nishio 3-2-60 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo SRR Engineering Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) B21D 37 /14

Claims (1)

(57) [Scope of request for utility model registration] 1. A main body having an engaging portion for engaging with a base for fixing a mold or a workpiece (hereinafter, simply referred to as “mold or the like”) and formed to be movable along a base surface. A clamp provided on the main body and formed with a holding portion that can move forward and backward in both directions toward the base surface and the main body; and a fluid pressure driving portion provided to drive the clamp. In the clamp device, a friction coefficient of the base with respect to the engagement portion is formed to be smaller than a friction coefficient of a pressed portion such as the mold with the pressing portion, and the mold and the like are fixed to the base. The distance between the side surface of the main body and the mold or the like in the previous unclamped state is such that the pressing portion is fixed after the pressing portion starts to contact the pressed portion and before the mold or the like is fixed to the base. Is the distance that the To be wider than the clamping device, characterized in that a biasing means for biasing the direction of separating the body from the mold or the like in the body or the mold or the like.