JPH0241386B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a mold clamping device, and more specifically, a mold placed on a surface plate is pressed from above by a clamp piece so as to be placed on the surface plate.

The term "surface plate" here refers to anything in a broad sense; for example, a movable/fixed plate for mounting a mold in a die-casting machine, a platen in an injection molding machine, a bolster in a press, a surface plate in a jig, a bolster, or a workpiece. This refers to a wide range of places in machines such as beds and other places where molds, etc. can be attached (hereinafter, the term "surface plate" shall have this meaning).

Conventional technology In the past, many mold clamping devices of this type used hydraulic pressure to operate clamp pieces to place the mold on a surface plate, but the structure of the clamping device was complex, and because hydraulic pressure was used, The cost is high, and it is necessary to configure the clamping piece so that it does not come into contact with the mold when it is placed on the surface plate, and there are problems such as requiring a large amount of space for the clamping device.

Purpose of the Invention The present invention aims to solve the above-mentioned problems, and aims to simplify the structure and reduce costs by manually operating the clamp piece without using a pressure source such as hydraulic pressure, and moreover, it is similar to hydraulic pressure. In addition to ensuring that the mold is placed in place with a moderate clamping force, the clamp piece is stored in a case that does not interfere with the mold placement part when not in use. The object of the present invention is to provide a mold clamping device that protrudes to the upper surface and performs a pressing operation, and that does not take up much space and can be easily operated.

Structure and operation of the invention In order to achieve the above-mentioned object, the present invention includes flanges provided on both side walls of an inverted clamp case, which are fixed to a surface plate with bolts, and a camshaft is rotatably mounted in the case. A push rod is protruded from the camshaft, and an operating lever is detachably attached to the camshaft, while a clamp is installed in the holding member suspended in the case and in the gap between the cam part of the camshaft and the top wall of the case. A piece is slidably and tiltably provided on the holding member, a round bar-shaped press piece is fixed to the bottom surface of the tip of the clamp piece, and the operation lever is rotated to move the clamp piece from the case to the upper part of the mold by rotating the push rod. The present invention provides a mold clamping device characterized in that the clamping piece is moved forward and the clamping piece is tilted by a cam so that the pressing piece presses and fixes the mold to a surface plate.

Embodiments Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

In the figure, 1 is a surface plate, 2 is a mold clamp device fixed on both sides of the upper surface of the surface plate 1, and 3 is a mold placed on the surface plate 1 and fixed by the clamp device 2.

The mold clamping device 2 has an inverted case 4.
A flange 4 is attached to the lower side of both front and rear walls 4a, 4b.
c and 4d are provided protrudingly, and bolts 12 and 12 are inserted into the bolt holes 4 _c-1 and 4 _d-1 drilled in the flanges 4c and 4d, and screwed into the bolt holes 1a of the surface plate 1 to complete the case 4. is fixed on surface plate 1. In the outer side of the case 4 (the right side in the illustrated embodiment), a cam shaft 5 with a cam 5b fixed to a cam mounting rod 5a is attached to a shaft hole 4a _-1 bored in the front and rear walls 4a and 4b of the case. 4 _b
The cam 5b is rotatably mounted between the front and rear walls 4a _and 4b. A push rod 6 is provided protruding from the outer periphery of the small diameter portion 5 _b-1 of the cam 5 b, and the largest large diameter portion 5 _b-2 is formed at a location approximately 90 degrees apart from the attachment portion of the push rod 6. It is the top of the cam. In addition, a hole 5 _b-3 for attaching a lever is provided in a part opposite to the attachment position of the push rod 6, and a long operating lever 7 for rotating operation is detachably protruded, and the lever 7 is attached to the case 4. It is designed to be rotatable from the lower end opening to the outer end opening.

At the center of the case 4, a holding member 9 for preventing the clamp piece 10 from falling is pivoted at both ends between the front and rear side walls 4a and 4b. A clamp piece 10 is slidably and tiltably housed in the gap between the holding member 9 and cam 5b and the case top wall 4e. The clamp piece 10 has a front-rear length that is equal to the case front and rear walls 4a,
4b, and the left and right length is the case 4.
The length of the clamp piece 10 is larger than the horizontal length of the holding member 9, and the length of the clamp piece 10 is larger than the horizontal length of the holding member 9.
It has a flat plate shape with a width such that a gap S ₁ is formed between the upper surface and the upper wall 4e of the case when it is slidably supported thereon. The clamp piece 10 is provided with a hole 10a at a position closer to the outside, into which the push rod 6 is inserted and removed. The hole 10a has a diameter larger than the diameter of the push rod 6, and a tapered notch 10a _-1 is formed at the lower end of the outer edge.
In addition, the push rod 6 is also formed with a channel-shaped notch 6a on its outer surface. Further, a pressing piece 8 having a round bar shape and having the same longitudinal length as the clamp piece 10 is welded to the lower end of the clamp piece 10, while a lever 7 is inserted into the outer end of the clamp piece 10 during rotation. A possible cut groove 10c is provided. The clamp piece 10 is secured to the case 4 by rotating the push rod 6 inserted into the hole 10a counterclockwise.
protrudes from the inner end opening and advances upwards of the mold 3;
The large diameter portion 5 _b-2 of the cam 5 b contacts the lower surface of the clamp piece 10 and pushes it up, so that the inner end of the clamp piece 10 tilts using the contact point between the holding member 9 or the pressing piece 8 and the mold 3 as a fulcrum. is lowered, and the pressing piece 8
The upper surface of the mold 3 is pressed and clamped. At that time, a tapered inclined surface 4 _e-2 is provided on the inner surface of the case top wall 4 e so that the clamp piece 10 can tilt smoothly, and the inner end 4 _e-3 of the inclined surface 4 _e-2 is When the piece 10 is in the storage position, the clamp piece 10 is set to just abut against the upper surface of the clamp piece 10 and to slidably hold the clamp piece 10 between the holding member 9. In addition, the inclined surface 4 of the case 10
At the center of the inner end of _e-2 , there is a bolt 12,
An escape groove 4 e-1 is formed so that a uniform force is applied to the groove 4 _e-1 .

Furthermore, a mold guide 11 is attached to the inner end surfaces of the front and rear walls 4a, 4b of the case 4 for protecting the case and positioning the mold when inserting the mold.

In the clamp device 2, when not in use, the first
As shown by the solid line in the figure, the clamp piece 10 is housed in the case 4. In this state, the mold 3 is placed on the surface plate 1 and positioned using the mold guide 11. When clamping, the operating lever 7 is inserted into the hole 5b _-3 of the cam 5b, and the lever 7 is rotated upward and counterclockwise. As the lever 7 rotates, the camshaft 5 rotates, and the push rod 6 also rotates. The push rod 6 is inserted into the hole 10a of the clamp piece 10, and as it rotates, it comes into contact with the inner wall of the hole 10a, and moves the clamp piece 10 inwardly according to the rotation.
Move the inner end of 0 above the mold 3. The clamp piece 10 is initially guided by the holding member 9 and moves horizontally, but when the camshaft 5 rotates by a required angle (approximately 45 degrees), the large diameter portion 5 _b-2 of the cam 5b moves to the clamp piece 10.
It comes into contact with the lower surface of the cam, and rises above the holding member 9 depending on the shape of the cam. When further rotated, the upper surface of the clamp piece 10 hits the case upper wall 4e and tilts along the inclined surface 4e _-2 of the case upper wall 4e, pressing the lower surface of the inner end of the clamp piece 10 located above the mold 3. Piece 8 descends and presses mold 3. Then,
As shown in FIG. 4, the mold 3 is clamped to the surface plate 1 by the cam 5b, the case 4, the clamp piece 10, and the pressing piece 8.

To release the clamp on the mold 3, reverse the above and rotate the lever 7 downward clockwise. First, the pressing piece 8 will rise and the clamp will come off, and the clamp piece 10 will hit the holding member 9. Then, the push rod 6 is inserted into the hole 10a of the clamp piece 10, and the clamp piece 10
is retracted by the push rod and stored in the case 4.

Effects As is clear from the above explanation, according to the mold clamping device according to the present invention, the clamp piece stored in the case can be moved from the case to the mold by manually rotating one camshaft member using a lever. It is possible to move the clamp piece forward upward, then tilt the clamp piece, and press the mold with the pressing piece fixed to the lower surface of the tip of the clamp piece.The structure is simple, and unlike conventional pressure sources such as hydraulic pressure is not used. Cost reduction can be achieved. What's more, the mold can be fixed with a pressing force comparable to hydraulic pressure with just one touch of a lever. In addition, since the clamp piece is housed in the case, it does not get in the way when the mold is placed on the surface plate, and it has various advantages such as requiring less space for the clamp device. Note that the present invention is not limited to the embodiments, and can be applied to various fields without departing from the gist of the invention.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention;
The figure is a plan view of FIG. 1, FIG. 3 is a right side view of FIG. 2, and FIG. 4 is a sectional view when clamped. 1...Surface plate, 2...Clamp device, 3...Mold, 4...Case, 5...Camshaft, 5b...Cam, 6...Push bar, 7...Lever, 8...Press piece,
9... Holding member, 10... Clamp piece, 10a...
...hole, 12...bolts.

Claims (1)

[Claims] 1 The flanges provided on both sides of an inverted clamp case are fixed to a surface plate with bolts, a camshaft is rotatably mounted inside the case, a push rod is protruded from the camshaft, and a push rod is provided for operation. While the lever is removably attached, a holding member is mounted on the shaft within the case, and a space between the cam of the camshaft and the top wall of the case is
A clamp piece is slidably and tiltably provided on the holding member, and a pressing piece is fixed to the lower surface of the tip of the clamp piece,
The press rod is rotated by the rotation of the operating lever to advance the clamp piece from the case to the upper part of the mold, and the clamp piece is tilted by a cam so that the press piece presses and fixes the mold to the surface plate. mold clamping device.