JPH05245903A - Method for positioning metal molds mutually - Google Patents

Abstract

PURPOSE:To make mutual positioning of metal molds easy by a method wherein one side of the metal mold is elastically temporarily champed sideward. CONSTITUTION:In a metal mold wherein a projection part and a recess part which form a cavity are provided on mutually opposed surfaces of a movable metal mold 1 and a fixed metal mold 2 and the molds are closed by mutually fitting the projection part to the recess part, the fixed metal mold 2 is temporarily clamped to a specific position of a fixed board 4 under pressing aside with an elastic member. The fixed metal mold 2 is positioned by mating the fixed metal mold 2 with the moval metal mold 1 attached to a movable board 3. Thereafter, the fixed metal mold 2 is regularity clamped to the fixed board 4 in a mold-closed state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of positioning molds with each other when the molds are mounted on a molding machine such as an injection molding machine.

[0002]

2. Description of the Related Art In the usual mounting of a mold, the mounting of the mold on the movable plate is preceded, and then the mounting of the mold on the fixed plate side is performed. Further, the fastening to the fixed plate is performed by bolting at four locations or by providing clamps at four locations on the left, right, top and bottom of the die mounting plate and individually fastening the clamps to the die.

Even when the molds are fixed in place, there is a slight misalignment between the molds, which may cause mold closing failure. Therefore, when the molds are mounted, the molds are first positioned relative to each other. There is a need.

This positioning is carried out on the mold on the side of the stationary platen, and most of them are loosened to some extent by tightening the mold with bolts or clamps, and temporarily fixed to the mold in a fixed position to the side of the mold. It is done after matching the mold after giving the flexibility of.

[0005]

In such positioning, it is difficult to tighten the mold, and if the tightening is too loose at the time of temporary fixing, the mold will shift too much below the fixed position, which makes mold matching difficult. In addition, since it is difficult for the mold to escape to the side when it is over-tightened, biting may occur due to mold matching, and the mold may be damaged in some cases.

Particularly, in a mold in which a straight surface is fitted on an anchor and the mold is closed, a clearance is provided in order to prevent wear of a fitting portion when the mold is opened and closed. Since it is extremely small, positioning is very troublesome and time-consuming, and there is a problem that productivity is affected in the case of small-quantity production in which frequent die replacement is required.

The present invention was conceived in order to solve the above-mentioned conventional problems, and the purpose thereof is to easily perform positioning by elastically temporarily clamping a fixed mold laterally. Another object of the present invention is to provide a new method of positioning the molds with respect to each other.

Another object of the present invention is to provide a mutual mold positioning method capable of eliminating the displacement of the mold closing position due to the clearance of the fitting portion by temporarily removing the clearance.

A further object of the present invention is to provide a mutual mold positioning method which can also be used for positioning of molding dies for compact discs.

[0010]

One feature of the present invention according to the above object is to have a convex portion and a concave portion that form a cavity on the facing surfaces of a movable mold and a fixed mold, and to have the convex portion and the concave portion. In a mold that fits into each other and closes the mold, the above fixed mold is temporarily clamped at a fixed position of the fixed plate under the pressure of the elastic member to the side, and the fixed mold and the movable plate are attached. After the fixed mold is positioned by matching the mounted movable mold with the fixed mold, the fixed mold is clamped to the fixed plate in the clamped state.

Another feature of the present invention is that the movable mold and the fixed mold have concavities forming cavities on opposite surfaces thereof, and one of the concavities is provided with a required clearance in the other. In the mold that closes the mold, attach the movable mold to the movable plate and temporarily clamp the fixed mold in place on the fixed plate under the pressure of the elastic member to the side. After raising the mold temperature to the molding temperature, the fixed mold is positioned by matching the molds, and then the fixed mold side is heated above the molding temperature to eliminate the above clearance by thermal expansion. In that state, the mold is clamped and the fixed mold is permanently clamped to the fixed platen.

Still further, according to the present invention, the above-mentioned recesses formed on the facing surfaces of the movable mold and the fixed mold form a cavity of a circular plate-shaped molded product, and a stamper is provided on one of the mold surfaces of the cavity. It is also characterized by.

[0013]

[Operation] In the above-mentioned configuration, the fixed mold, which is inserted into the fixed plate at a fixed position, is laterally flexible when it is temporarily clamped to the fixed plate under the lateral pressure of the elastic member. Therefore, the deviation of the fitting position of the mold is corrected in the process of mold matching after the temporary clamp, and the fixed mold can be positioned by the temporary clamp.

After this die matching, the die is clamped and the fixed die is fully clamped on the fixed platen, and its position becomes a fixed position.
There is no need to adjust the position for this clamp.

If there is a risk that the fixed mold will be displaced by the amount of the clearance in the course of this clamp, the clearance will cause thermal expansion at the fitting part on the fixed mold side due to the heat medium due to the temperature rise on the fixed mold side. The outer diameter is lost due to the expansion, and the fixed mold is held by the movable mold and becomes immobile.

In such a state, a slight displacement of the fixed mold does not occur, so that the position of the fixed mold does not shift during the main clamp. Further, the clearance is generated again by lowering the mold temperature of the fixed mold, and even if the mold is closed straight, the fitting portion is not rubbed.

[0017]

Embodiments of the present invention will now be described with reference to a compact disc (CD).
The case of an injection mold for molding will be described in detail as an example.

In the figure, 1 is a movable mold, 2 is a fixed mold, and these are separately mounted on a movable platen 3 and a fixed platen 4 of a mold clamping device having a normal structure.

The fixed plate 4 is a mold mounting plate 4 provided on the inner side surface.
Clamps 5, which also function as guide plates, are provided in parallel above and below a so that the fixed mold 2 can be inserted laterally between the guide plates. Further, on one side of the inner surface of the fixed platen 4, a mold receiving member 7 formed of a long block having a coupler 6 for temperature adjustment provided therethrough.
Is installed vertically.

On the opposite side of the die receiving member 7, the upper and lower tie bars 9, 9 each having one end of the temporary clamping device 8 connected to the fixed platen 4 are provided.
It is inserted through and attached to. The temporary clamp device 8 includes a vertically long seat plate 10 vertically inserted through the upper and lower tie bars 9, 9.
As shown in FIG. 2, a vertically long guide case 11 fixed to the inside of the seat plate 10 and a clamp member 13 in the guide case 11 that is movably connected in the axial direction with a bolt 12 are provided at the tip. Coil spring 1
4 and a clamp operating rod 15 which is always elastically pressed outward, and the clamp operating rod 15 is screwed into the seat plate 10 with the clamp member 13 inside.

The movable mold 1 and the fixed mold 2 are circular recesses 1 forming a cavity 16 for CD molding on the opposite surfaces.
7 and 18. The concave portion 18 on the fixed mold side is formed by leaving the fitting peripheral edge 20 in the plane of the convex portion that fits into the peripheral edge 19 of the concave portion 17 of the movable mold 1, and the sprue bush 21 and the internal portion are formed in the center thereof. The stamper holder 22 is fitted concentrically with the stamper holder 22.

A ring-shaped external stamper holder 23 is fitted in the periphery of the recess 18, and the stamper 24 is provided on the bottom surface of the recess 18 by the stamper holders 22 and 23.
Are attached in close contact.

The inner surface of the peripheral edge 19 of the recess 17 and the recess 1
The outer surface of the fitting peripheral edge 20 of 8 is formed straight, and both of them are closed in the state of the anchor. Further, in order to prevent rubbing when the mold is opened and closed, a required clearance (for example, 10 μm) is provided between both peripheral surfaces.

Although not shown in the drawings, a passage for a heat medium is provided inside each of the molds as in a normal mold, and in the fixed mold 2, the coupler 25 is projected to the side of the insertion side. There is. Further, a grip 26 is provided on the side portion on the pushing side, and the clamp 13 of the temporary clamp device 8 is brought into contact with the grip 26 so that the fixed mold 2 can be temporarily clamped.

Next, a method of positioning the mold will be described with reference to FIGS. First, the movable mold 1 is first attached to the movable platen 3 in the mold open state. Next, the fixed mold 2 is attached to the fixed platen 4. Before the insertion, the temporary clamp device 8 is laterally displaced in advance and the clamp 5 is loosened. When the fixed mold 3 is inserted, the upper and lower step portions 27 are fitted into the clamp 5 from the side of the temporary clamping device side as shown in FIG. 1, and the side surface on the insertion side approaches the mold receiving member 7. Do as far as possible.

After inserting the fixed mold 2 into the fixed plate 4 at a fixed position, the temporary clamping device 8 is slid back to the fixed mold side, and the clamp operating rod 15 is rotated by the handle 28 to clamp the clamp 13. Is brought into contact with the handle 26, and the coil spring 14 is appropriately compressed to press the fixed mold 2 laterally. The pressing force at this time is
It is preferable that the reaction force and the suspension force during the fitting of the O-ring 6a and the appropriate compression force with respect to the O-ring 6a are generated.

As a result, the fixed mold side and the couplers 6 and 25 on the mold receiving member side are jointed to allow the temperature of the fixed mold 2 to be raised by the heat medium, and the fixed mold 2 and the mold receiving member 7 are temporarily used. It is elastically sandwiched by the clamp device 8 and temporarily clamped at a fixed position on the fixed platen 4.

Between the temporary clamps of this fixed mold 2, the mold temperature of the movable mold 1 is raised to the temperature at the time of molding (for example, 90 ° C.). Further, the mold temperature of the fixed mold 2 is also raised to the same temperature. For this, the fixed mold 2 is adjusted to the temperature at the time of molding in advance, or the temperature is raised by a heat medium after insertion. Either of these may be adopted.

After adjusting the mold temperature, the movable platen 3
Is moved forward to align the movable mold 1 and the fixed mold 2. At this time, since the temporarily clamped fixed mold 2 has flexibility in the lateral direction, even if the displacement of the fitting position is very slight, the fitting periphery 2 of the recess 18 is located inside the peripheral edge 19 of the recess 17.
The position of the fixed mold 2 is determined by being corrected in the process of 0 being set.

The mold is clamped after the mold matching and the fixed mold 2 is finally clamped on the fixed platen 4. However, in the process of the main clamp, the fixed mold 2 may be displaced by the amount of the clearance. Perform this clamp with the clearance removed.

The clearance can be eliminated by utilizing thermal expansion. After the mold matching, when the temperature of the fixed mold side is raised by about 10 ° C. from the mold temperature (90 ° C.) by a heat medium,
The outer diameter of the fitting peripheral edge 20 on the convex side expands due to the thermal expansion that occurs at the same temperature, and the clearance is lost and the inner peripheral edge surface of the concave portion 17 and the outer peripheral surface of the fitting peripheral edge 20 come into close contact with each other. As a result, the fixed mold 2 is held by the movable mold 1 and becomes immobile.

In such a state, a slight displacement of the fixed mold 2 does not occur, so that the fixed mold 2 is permanently clamped to the fixed platen 4 while maintaining this state. This main clamp can be easily performed by tightening the clamp 5 on the fixed platen 4. After the main clamp, the temporary clamp is released and the temporary clamp device 8 is removed from the tie bar 9.

After the completion of the main clamp, when the mold temperature of the fixed mold 2 is lowered to the original molding temperature, contraction causes clearance again. Therefore, since the mold is opened and closed by this clearance, even if the mold is closed with the straight anchor, no rubbing occurs.

The temporary clamp device 8 has a tie bar 9
However, the temporary clamping device may be attached by projecting support rods on the upper and lower sides of the fixed platen 4. Further, the shape of the cavity of the mold is not limited to that shown in the drawing, and the present invention is not limited to the CD molding mold because it can be applied to all the molds that are closed by the wax.

[0035]

As described above, the present invention provides a mold for closing a mold by fitting a movable mold and a fixed mold on an anchor.
Temporary clamping of the fixed mold at a fixed position on the fixed plate under pressure from the side by the elastic member, and matching of the fixed mold with flexibility on the side and the movable mold on the movable plate side. The fixed mold is positioned by using this, and the fixed mold is clamped on the fixed platen while maintaining that position by mold clamping, so positioning can be easily performed even with a mold with a small clearance at the fitting part. Since the mold can be opened and closed under the set clearance, the life of the mold is long.

Further, in a mold in which a concave part for forming a cavity is provided on the opposing surface of the movable mold and the fixed mold, and one of the concave parts is provided with a required clearance in the other concave part, the mold is closed without any difficulty. , The fixed mold is temporarily clamped at a fixed position of the fixed plate under the pressure of the elastic member to the side, the mold temperature of both molds is raised to the temperature at the time of molding, and then the fixed mold is matched by the mold. After that, the fixed mold side is heated above the molding temperature to eliminate the above clearance due to thermal expansion, and the mold is clamped in this state and the fixed mold can be permanently clamped to the fixed platen. Therefore, it is possible to solve the mold closing failure due to a slight deviation which is likely to occur in the process of the main clamp.

Moreover, since the solution is made by the thermal expansion of the fitting portion caused by the temperature rise on the side of the fixed mold, the clearance can be reproduced by the temperature decrease after the main clamp, and the accuracy does not change. It has features such as being able to secure an extremely small clearance and positioning in a short time.

[Brief description of drawings]

FIG. 1 is a front view of a fixed plate side showing a method of positioning dies according to the present invention.

FIG. 2 is a plan sectional view of a temporary clamp portion.

FIG. 3 is an explanatory diagram of a method of positioning the molds relative to each other.

[Explanation of symbols]

 1 movable mold 2 fixed mold 3 movable plate 4 fixed plate 5 clamp 7 type receiving member 8 temporary clamp device 9 tie bar 13 clamp member 14 coil spring 15 clamp operating rod 16 cavity 17 recessed part on movable mold side 18 fixed mold side Recessed portion 19 Recessed peripheral edge of movable die side 20 Fixed peripheral edge of fixed die side 24 Stamper

Claims (3)

[Claims] 1. A mold having a convex portion and a concave portion that form a cavity on opposing surfaces of a movable mold and a fixed mold, and the convex portion and the concave portion are fitted to each other in a brazing manner to close the mold. The fixed mold is temporarily clamped at a fixed position on the fixed plate under the lateral pressure of the elastic member, and the fixed mold is aligned with the movable mold attached to the movable plate. After positioning, a fixed mold is clamped on a fixed platen in a mold clamped state, and the molds are mutually positioned. 2. A mold for forming a cavity on the opposing surfaces of a movable mold and a fixed mold, and forming a cavity in any one of the concaves and providing a required clearance in the other mold. In the above, while attaching the movable mold to the movable plate, the fixed mold is temporarily clamped at a fixed position of the fixed plate under the lateral pressure of the elastic member, and the mold temperature of both molds is set to the molding temperature. After the temperature is raised to 1, the fixed mold is positioned by mold matching, and then the fixed mold side is heated to a temperature above the molding temperature to eliminate the above clearance due to thermal expansion, and the mold is clamped in that state. A method for positioning of fixed molds to each other, wherein a fixed mold is permanently clamped to a fixed platen. 3. The recess formed in the facing surface of the movable mold and the fixed mold is circular and forms a cavity of a plate-shaped molded product, and a stamper is provided on one of the mold surfaces of the cavity. 2. The method of positioning the dies relative to each other.