JPS5940121Y2 - Mold changing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a die changing device that allows quick and accurate attachment and replacement of a die to a press machine or the like.

In response to high-mix, low-volume production of products in press work, a mold changing device called a quick die change device is used as a device to shorten setup time such as mounting, replacing, and positioning molds on press machines, etc. Various methods have been considered, and some have been put into practical use.

This mold changing device requires means for positioning the mold relative to the upper surface of the press press's bolster, the lower surface of the slide, or, if a die set is used, the mold mounting surface of the die set. It is required to have a means for pressing and fixing a mold positioned at that position, and to be able to quickly and easily operate and release the mold in one operation.

For example, as an example of this type of mold changing device, as seen in Japanese Patent Publication No. 46-7668, a base plate with a mold etc. attached is inserted into a guide groove of a slider that moves up and down, and the slider is moved. There is a method in which the base plate is clamped by moving it up and down using driving means using air pressure, hydraulic pressure, etc., and at the same time, the base plate is positioned by inserting a positioning pin protruding from the surface into the positioning hole of the base plate. .

However, the mold changing device having the above-mentioned structure has a complicated mechanism and is expensive, and a device that performs clamping using pneumatic or hydraulic means requires a large-scale auxiliary device.

Therefore, there are problems in that the device itself becomes large and its maintenance and inspection work is complicated.

On the other hand, the present inventor has proposed a mold changing device with a simplified structure in Japanese Patent Application No. 54-42963.

The mold changing device proposed by the inventor of the present invention has a bracket that forms an insertion space for a base plate together with the base on the base of a die set, a lower base, and the like.
A positioning pin with a rack gear that passes through both the positioning hole of the base plate on which the mold is installed and the hole drilled in the base is housed in this bracket, and the positioning pin is inserted into the bracket. The structure includes a pinion shaft that moves up and down, and an eccentric cam that prevents the base plate from floating on the pinion shaft.

This mold changing device eliminates the drawbacks of conventional devices that use hydraulic or pneumatic pressure, has a greatly simplified mechanism, and is easy to operate.6 However, the mechanism for moving the positioning pin up and down is Since it is placed inside the bracket, the height of the bracket increases.

On the other hand, since the upper surface of the mold needs to be set higher than the bracket through which the material to be processed passes, the mold itself becomes thicker, resulting in poor machining efficiency and reduced machining accuracy. Alternatively, there are problems such as waste of mold material and increased loss in the heat treatment process.

In addition, due to the stroke of the press slide and the shut hide, the height of the bracket is high, and this mold exchange device has a mechanism that makes it impossible to replace the base plate without protruding the positioning pin further. There may be cases where this is not possible.

Furthermore, an example in which a rotating shaft is provided in a base such as a base or a lower stand, and a positioning pin that engages with this rotating shaft is disposed so as to be freely retractable is disclosed in Japanese Utility Model Application Publication No. 52-4429. There is.

However, the mold mounting device in this die set has a structure in which the shaft that moves the support body up and down to raise and lower the mold plate from the base and the positioning shaft are driven in relatively opposite directions. Therefore, lateral movement of the mold plate in the front, rear, left and right directions is prevented.

In order to prevent vertical movement, the mold plate is fixed to the base by a separately provided clamp device.

That is, in order to attach the mold to the die set using this attachment device, (1) rotate the square shaft portion and interlock the left and right shafts to move the support body up and down;

■Insert the mold plate into the guide groove of the support.

(2) Rotate the square shaft in the opposite direction to lower the support body so that the mold plate is placed on the top surface of the base, and at the same time raise the positioning pins.

■ Rotate the operating shaft of the clamp device to press and fix the mold plate on the base.

As described above, four steps are required to fix the mold plate to the base, and this poses a problem in that the mold cannot be replaced quickly.

This invention was made in view of the above-mentioned circumstances,
The vertical drive mechanism of the positioning pin that fits into the positioning hole of the base plate on which the mold is installed and performs positioning, and the actuation mechanism of the catch lever as a holding member having an arm that presses the base plate against the base. For example, by adopting a configuration in which the die set is housed within the base and lower base, the height of the members disposed on the top surface of the base can be significantly lowered, and the positioning pins can further protrude above the base plate when the base plate is replaced. It can also be applied to press machines with small slide strokes, and the positioning pin vertical drive mechanism and catch lever actuation mechanism are operated simultaneously to position the mold on the mold mounting surface. It is an object of the present invention to provide a mold changing device that simultaneously presses and fixes molds in their positions in one operation and can quickly and easily replace the molds.

Hereinafter, one embodiment of the mold changing device according to the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a schematic configuration of an embodiment of a mold changing device according to the present invention.

Here, reference numeral 1 denotes a lower stand of a die set that is attached to the upper surface of a bolster of a press machine (not shown) and serves as a base for attaching a mold.
A book guide post 2 is installed, and this guide post 2 is slidably fitted into a guide bush 4 provided on the upper base 3 of the die set, which is attached to the lower surface of the slide of the press machine, so that the upper base 3 can be moved up and down. will be guided.

Moreover, at least two or more holes 5 are bored at predetermined locations on the lower base 1, into which positioning pins (to be described later) are fitted with almost no gaps.

6 is a catch lever serving as a clamp member, 7 is a guide block, and 8 is an abutment pin.

As shown in FIG. 2, the catch lever 6 has an arm portion formed in an inverted shape and has a pressing surface 6b, and
The lower part is embedded in a hole 1a formed by penetrating the side surface of the lower base 1 back and forth, and pins 6a provided on both sides thereof are fixed onto the lower base 1 by, for example, screws 7a. By loosely fitting into a hole 7b drilled in the guide protrusion 7, it is swingably supported.

Further, 9a is an operating section formed at the end of the camshaft, which will be described later.

On the other hand, 11 is a base plate to which the lower die 12 is attached and fixed.

The base plate 11 is preferably one whose external dimensions and thickness are standardized, and whose two orthogonal sides in the vertical and horizontal directions serve as two right-angled reference planes as a reference for positioning. Based on the surface,
For example, processing for mounting a mold or mounting involves determining the position.

Furthermore, a plurality of positioning holes 13 are formed in the base plate 11 at predetermined positions that correspond exactly to the holes 5 of the lower base 1, into which positioning pins to be described later are fitted almost without gaps.

In addition, holes 5 are formed at predetermined positions on the surface of the upper table 3 facing the lower table 1, similarly to the lower table, and a catch lever 6, a guide block 7, and an abutting pin 8 are also formed.

Although not shown in the drawings, a base plate 14 to which the upper die is fixedly mounted is attached.

Here, since the lower stand 1 and the upper stand 3 have substantially the same structure, and the base plates 11 and 14 also have the same structure, the lower stand 1 and the base plate 11 will be described in detail below.

FIG. 3 is a plan view illustrating a main part in section along the line ■-■ in FIG. 1.

Here, 9 is a camshaft rotatably supported in a hole 1a in the lower stand 1 by a bearing part 15.

An eccentric cam 9b having an eccentricity t with respect to the camshaft 9 is fixed approximately at the center of the camshaft 9, as shown in FIG. 4a.

Furthermore, knock pins 1 are provided on both sides of the eccentric cam 9b.
6, a pinion gear 17 constituting a positioning pin vertical drive mechanism is fixed coaxially to the camshaft 9, and a rack gear 18a is formed in a part of the pinion gear 17, which fits into the hole 5 of the lower base 1. The positioning pin 18 is engaged.

As shown in detail in FIG. 5, this positioning pin 18 has a tapered tip and a cylindrical portion that is fitted into the hole 5 with almost no gap, and meshes with the Razoku gear 18a. Due to the rotation of pinion gear 17,
It is configured to extend and retract from the upper surface of the lower stand 1.

Reference numeral 19 denotes a compression spring that constantly presses the catch lever 6 in the direction F in the figure and brings the surface 6c of the catch lever 6 into constant contact with the eccentric cam 9b. Reference numeral 20 denotes a screw that adjusts the pressing force of this compression spring. be.

Further, 21 is a pin 2 implanted at the end of the camshaft 9.
2 and a pin 23 planted in the lower stand 1,
This is a tension spring that applies a tension force in the rotational direction of the camshaft 9.

In the above-mentioned configuration, before mounting the base plate 11, the camshaft 9 is rotated by applying an appropriate operating tool to the operating part 9a of the camshaft 9, and the eccentric cam 9b is rotated as shown in FIG. 4a.
Rotate in direction B in the diagram.

This rotation is stopped when the pin 22 hits a stop pin 22a installed in the lower base 1.

In this state, the tension spring 21 always acts to rotate the eccentric cam 9b in the direction B, so the camshaft 9 does not rotate in the opposite direction, that is, in the direction C in the figure.

On the other hand, the catch lever 6 is given a rotational force in the direction E in the figure about the rotation pin 6a by the compression spring 19.
Since the surface 6c is always in contact with the eccentric cam 9b, as the eccentric cam 9b rotates in the direction B, it rotates in the direction E in the figure about the rotation pin 6a.

At the same time, due to the rotation of the camshaft 9, the pinion gear portion 17 fixed to the camshaft 9 is rotated as shown in FIG.
The positioning pin 18, on which a rack gear portion 18a that engages with the positioning pin 18 is formed, is inserted into the hole 5 of the lower base 1.

Therefore, an insertion space for the base plate 11 is formed between the catch lever 6 and the upper surface of the lower stand 1.

Thereby, the base plate 11 is inserted into the lower stand 1 from the direction A as shown in FIG.

In this case as well, the insertion of the base plate 11 is guided by the guide block 7 whose cross section is shaped like an inverted letter, and by inserting the penis plate 11 until it hits the pin 8 at the abutment, the base plate 11 can be roughly positioning is performed.

In this case, if the space formed by the upper surface of the lower stand 1 and the holding surface 6b of the catch lever 6 is formed in advance so as to be larger than the thickness of the base plate 11 by, for example, 0.2 mmH, the thickness of the base plate 11 may vary. Even if some dust or the like adheres to the insertion surface of the base plate 11, the insertion operation can be performed smoothly.

Next, the camshaft 9 is rotated to rotate the eccentric cam 9b in the C direction as shown in FIG.

This rotation in the C direction is initially performed against the tensile force of the tension spring 21 and the elastic force of the compression spring 1.9, but when the pin 22 crosses the counter-action point, the tension spring Since the full thickness of 21 acts in a direction that promotes rotation of the eccentric cam 9b in the direction C in the drawing, the rotation in the direction C is performed smoothly and easily.

As the eccentric cam 9b rotates, the catch lever 6 rotates in the direction shown in the figure around the rotation pin 6a, and the eccentric cam 9b rotates at the position where the holding surface 6b abuts the upper surface of the base plate 11. stops.

In this case, the eccentric cam 9b needs to be formed so as to contact the contact surface 6c at an angle before its highest point.

After that, the eccentric force A9b is given rotational force in the direction C in the figure by the tension spring 21, so it is maintained at the position shown in Fig. 4, and is naturally caused by the movement of the press machine and vibrations generated from the press operation. There is no risk of reverse rotation leading to a dangerous situation in which the holding surface 6b separates from the surface of the base plate 11.

Further, in this case, the left and right sides of the camshaft 9 do not need to be rotated simultaneously, but can be rotated separately, making the rotation operation extremely easy.

On the other hand, since the pinion gear section 17 is also rotated in the direction C in the figure as shown in FIG. 5 due to the rotation of the camshaft 9,
The positioning pin 18 gradually protrudes from the upper surface of the lower stand 1.

In this case, the base plate 11 is roughly positioned when attached to the lower base 1, and the positioning hole 13 is approximately located above the hole 5.

Then, as the positioning pin 18 rises, the positioning pin 18 fits into the positioning hole 13, so that
The displacement of the base plate 11 is regulated, and ultimately, the base plate 11 is held in an accurate position, and the movement of the base plate 11 in the horizontal plane is reliably restrained.

By rotating the camshaft 9, the positioning of the base plate 11 by the positioning pin 18 and the holding operation by the catch lever 6 are simultaneously and reliably performed, and the planar movement of the base plate 11 is controlled by the positioning pin 18.
8, floating is prevented by a catch lever 6, and the lower table 1 is completely restrained and fixed.

Next, by rotating the camshaft 9 in the direction B shown in the figure, these restraints are released and the base plate 11 can be freely moved to the lower base 1.
It will be possible to take it out from there.

By the way, in the embodiment described above, the positioning pin 18
is simply inserted into the positioning hole 13 of the base plate 11, for example, as shown in FIG. By adopting a structure in which the base plate 11 is raised until it is inserted into the base plate 11, a structure that is strong against lateral forces applied to the base plate 11 can be obtained.

Further, the vertical drive mechanism for the positioning pin 18 does not depend on the pinion-rack mechanism, for example, as shown in FIG. 7a.

As shown in FIG. 1B, a simple mechanism may be used in which the arm 25 is fixed to the camshaft 9 and the end thereof is inserted into a slot hole 26 cut in the center of the positioning pin 18.

With this type of mechanism, the positioning pin 18 does not have a partially missing circle as in the case where a rack gear is provided, so the positioning accuracy of the base plate 11 is increased, and the amount of deviation due to lateral pressure is minimized. It has the following characteristics.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without changing the gist thereof.

As described above, the mold changing device according to the present invention has a camshaft built into the base such as the lower stand and base of the die set, and a positioning pin up and down drive mechanism consisting of, for example, a pinion gear or an arm, on the camshaft. The locating pin vertical drive mechanism is connected to the camshaft, and a spring mechanism is provided at the rear end of the camshaft to prevent it from returning. At the same time, the eccentric cam drives the positioning pin that penetrates the positioning hole of the base plate and the positioning hole of the base plate with almost no gap or is stored in the base.At the same time, the eccentric cam drives the catch lever that suppresses or releases the floating of the base plate. These units are arranged in pairs on the left and right sides of the base, and by individually rotating the camshafts, the base plate can be quickly attached and detached.

Therefore, the mold changing device according to the present invention can prevent lateral movement by the positioning pin of the base plate only by rotating the camshaft, and can also prevent vertical movement by the eccentric cam. This has the effect that replacement work can be performed quickly and accurately.

In addition, since the height of the parts on the base can be kept low, it can be applied to press machines with small slide strokes.Moreover, the mold can be made thinner, so there is no wastage of mold material and processing is easier. As a result, mold machining time can be shortened, machining accuracy is improved, and mold handling becomes easier.

Furthermore, by reducing the height of the parts on the base, the base can be thickened and strengthened to minimize deformation due to press force, thereby expanding the scope of application of the mold changing device. A top product that facilitates the production of molds used in mold changing equipment.
Moreover, the effect obtained is extremely large in terms of increasing the strength of the base and maintaining the function of the mold changing device over a long period of time.

Furthermore, the mold changing device according to the present invention does not require an auxiliary mechanism such as a hydraulic or pneumatic source, and the left and right camshafts do not require an interlocking mechanism, so the mechanism is simplified and can be manufactured at low cost. At the same time, maintenance and inspection work on the press machine becomes easier, and there is no danger of a sudden pressure drop in the hydraulic or pneumatic source or a pressure drop caused by a leak in a broken conduction hose. The effect obtained is extremely large in terms of improving work efficiency.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a perspective view showing a schematic configuration of an embodiment of a mold changing device according to the present invention, FIG. 2 is an exploded perspective view of the main parts of the embodiment, and FIG. , FIG. 4a is a plan view showing a main part in section along line 11-1 in FIG. 1; b and 5 are sectional views of the main parts of the same embodiment, and Figs. 6 and 7 a and b are front and side views showing the main parts of another embodiment of the mold changing device according to the present invention. be. 1...Lower stand, 3...Upper stand, 5...
...hole, 6...catch lever, 9...
・Cam, 9b...Eccentric cam, 11...
Base plate, 13...Positioning hole, 17.
...Pinion gear, 18...Positioning pin, 18a...Rack gear.

Claims (1)

[Scope of utility model registration request] A mold changing device equipped with a mounting mechanism for positioning and preventing vertical movement of a base plate for attaching a mold to the base of a die set consisting of a base such as a base and a lower base and a guide post, On the left and right, a camshaft is installed independently in a pair of holes drilled in the front-rear direction, an eccentric cam is fixed to the center of the camshaft, and the base is in contact with the eccentric cam. A catch lever has an L-shaped arm that protrudes from above and presses the base plate against the upper surface of the base, and is swingably fixed to the guide block. a compression spring that biases the camshaft, a positioning pin vertical drive mechanism fixed to the camshaft, and a positioning pin that engages with the positioning pin vertical drive mechanism and tightly fits into the hole in the base and the positioning hole in the base plate. The mold changing device has a structure in which the ↓ arrow lever and the positioning pin are moved together by the rotation of the camshaft.