JPH0514813Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an integral foaming mold that facilitates demolding of a molded product.

<Conventional technology> Inserts (core material), urethane foam,
An integrally foamed molded product made of skin material is used. Such integrally foamed molded products are manufactured by setting inserts and skin materials in the upper and lower molds of an integrally foaming mold, and injecting a urethane raw material between them to cause foaming. . Note that the insert is set into the upper mold using pins. That is, a fixing reference pin for setting the insert in an accurate position is implanted in the upper die, and a pin fitting hole is provided in the insert.
By fitting each pin and hole,
The insert is set in the upper mold.

By the way, a difficult task when manufacturing an integrally foamed molded product is demolding after molding (separation of the molded product from the mold). The reason why this demolding is difficult is partly because the reference pin for fixing the insert is connected to the molded product, but mainly because the urethane raw material flows into the gap between the insert and the upper mold and bonds them together. It is. Of course, a mold release agent is applied to the upper mold in advance, but there is a limit to the effectiveness of the mold release agent in front of the urethane raw material, which has extremely adhesive properties. Therefore, in recent years, integral foam molds have been used that are designed to be easily removed and improve work efficiency.

In the conventional integral foaming mold that is designed to be easily removed, as shown in FIG. (stored in the upper mold)
In addition, a demolding press pin 3 was newly provided on the upper die 1 so as to be movable forward and backward, and the insert 8 was pushed out by the extrusion pin 3 during demolding.

In this conventional integral foam mold, the reference pin 4 for fixing the insert is operated by a wire 5 through a small hole 16 drilled in the upper mold 1, while the extrusion pin 3 is operated by compressed air through a separately provided ventilation hole 7. It was being manipulated by sending it.

<Problems to be solved by the invention> However, such conventional integral foaming molds that are designed to be easily removable have the following problems. That is, an expensive compressed air source 15 is required;
Since the mold structure also became complicated, an increase in manufacturing costs was unavoidable. Furthermore, failure of the compressed air source itself and air leaks in the air supply system often occur, making it unreliable. In addition, there was a risk that the molded product would suddenly come off the mold at some point due to the high-pressure compressed air, which also posed a safety problem. In order to avoid this risk, it is necessary to control the pressure of compressed air, but this has been difficult because the force required for demolding varies for each molding.

This invention was devised to solve the above-mentioned problems, and its purpose is to achieve extremely simple operation and safety without using equipment or complicating the mold structure, which would be a cost factor. It is an object of the present invention to provide an integral foaming mold that can reliably and easily demold a molded product.

<Means for Solving the Problems> The integral foaming mold of the present invention that can achieve the above-mentioned purpose is such that both the reference pin for fixing the insert and the extrusion pin for demolding can protrude into the upper mold via a compression spring. It is provided with wires for pulling the pins into the upper mold against the elastic force of the springs, and simultaneously pulls one wire and relaxes the other wire. It is characterized in that a wire steering device capable of performing the reverse operation is attached to the upper mold.

In other words, the simultaneous and contradictory ejection and retracting operations of the insert fixing reference pin and the demolding push-out pin, both of which are provided inside the upper die so that they can be protruded via compression springs, are carried out from the side where the compression springs are present on each of the two pins. This is done using connected wires, and this is an integral foaming mold with a wire steering device attached to the upper mold. Note that throughout this specification, the word "relaxation" is used to mean "an action opposite to traction."

A spring is preferable as the compression spring. It is preferable to use compression springs having the same elastic force for the fixing reference pin and the demolding extrusion pin.

It is common to provide two to several fixing reference pins and demolding extrusion pins, but even in that case, the wire steering device may be integrated. In other words, one device main body and each pin are connected by a large number of wires (or wires branched from the middle), and when the wire group connected to the reference pin is pulled, it is connected to the extrusion pin at the same time. It is sufficient if the wire groups are relaxed and vice versa. The wire can be connected to each pin through a hole drilled in the upper mold.

For example, a simple device in which the wires are connected to a jig attached to the upper mold so as to be movable over a certain range, and the connected portions are manually moved, is sufficient as the wire steering device.

<Operation> With the above structure, the insert fixing reference pin and the demolding push-out pin move back and forth simultaneously and in opposite directions. That is, the pin connected to the pulled wire is housed in the upper mold against the elastic force of the spring, and the pin connected to the relaxed wire is pushed out by the elastic force of the compression spring. Protrudes above the cavity surface. Therefore, when setting or molding the insert, only the reference pin for fixing the insert is reliably projected onto the cavity surface, and when demolding, only the push-out pin for demolding can be reliably projected onto the cavity surface, and the functions of each pin can be activated. Note that when the wire steering device is operated against the force of one spring, it receives assistance from the other spring, so strong operating force is not required.

<Examples> Examples of the integrally foamed mold of the present invention will be described below with reference to the drawings, but the present invention is not limited thereby.

FIG. 1 is a schematic cross-sectional view showing an integrally foamed mold 20 of this embodiment in which an integrally foamed molded article 13 is being manufactured. This figure shows the state immediately after molding (before demolding). In the present molding die 20, the upper die 1 is provided with three insert fixing reference pins 4 and three demolding push-out pins 3 (only one of each is shown in the figure). The reference pin 4 is operated by wire A, and the ejector pin 3 is operated by wire B. Each wire A, B is connected to each pin 4, 3 through each wire hole 16, 17 drilled in the upper die 1. These wires A and B (six in total) are controlled by one wire control device 14 attached to the upper mold 1. As shown in FIGS. 2 and 3, the device 14 has a symmetrical wire end fixture 12 rotatably and lockably provided on the upper part of the shaft 10, and changes the direction in which the lever 6 is tilted. This allows the wires A and B to be pulled or relaxed. As can be seen from FIGS. 2 and 3, the wires A and B constantly move in opposite directions so that when one is pulled, the other is relaxed.

As shown in FIG. 4, the demolding push-out pin 4 is provided on the upper mold 1 with a compressed spring 9 interposed therebetween. When wire B is relaxed, the ejector pin moves into cavity 1 due to the strong elastic force of spring 9.
protrudes above a. Conversely, when the wire B is pulled, the extrusion pin 3 is housed in the upper mold 1. The reference pin 4 for fixing the insert is also provided in the same manner as the push-out pin 3. The difference is that the diameter is φ5 mm (the diameter of the extrusion pin is φ10 mm), and it is connected to wire A. That is, in this mold 20, when the reference pin 4 is projected onto the mold cavity surface, the ejector pin 3 is accommodated in the upper mold 1, and when the reference pin 4 is accommodated, the ejector pin 3 is protruded.

To manufacture the integrally foamed molded product 13 using the mold 20, first, as shown in FIG. 3, the lever 6 is pushed down in the Y direction to pull the wire B and relax the wire A. In this way, only the reference pin 4 (see FIG. 1) is made to protrude, and the insert 8 is moved into the upper mold 1 by the pin 4.
Set it on the cavity surface. At that time, reference pin 4
Since the insert 8 is pressed by a spring and will not be dented, it is easy to set the insert 8 into the upper die 1. Thereafter, integral foam molding is carried out according to a conventional method, and after opening the mold, the lever 6 of the wire control device 14 is tilted in the X direction as shown in FIG. The reference pin 4 is then pulled out from the insert 8. At the same time, the extrusion pin 3 presses the insert 8 with a strong force due to the elastic force from the spring. For this reason, the integrally foamed molded product 13 was adhered to the upper mold 1 with urethane.
is easily demolded.

<Effects of the Invention> As is clear from the above description, the integral foaming mold of the present invention provides the following effects.

First, it becomes possible to easily demold the mold without complicating expensive equipment or mold structure, so the manufacturing cost of the integrally foamed molded product can be reduced.

Moreover, the integrally foamed molded product can be demolded by simple operation of the wire steering device, which greatly reduces the work load.

In addition, the extrusion pin for demolding can be controlled reliably, and there is no risk of sudden accidents unlike when compressed air is used.

The integral foaming mold of the present invention uses an extremely simple wire steering device and compression springs and is constructed as described above, so it is easy to replace the conventional integral foaming mold with the integral foaming mold of the present invention. Can be modified.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view showing an integral foaming mold according to an embodiment of the present invention in a state before demolding, and Figs. 2 and 3 show the contrast of the wire steering device attached to the mold. FIG. 4 is a partially enlarged cross-sectional view of a portion of the mold where the extrusion pin is provided, and FIG. 5 is a diagram of a conventional integral foam mold. In the figure, 1...upper mold, 3...extrusion pin, 4...reference pin, 8...insert, 9...spring,
14...Wire steering device, 20...Integrated foam mold, A, B...Wire.

Claims (1)

[Scope of utility model registration request] Both a reference pin for fixing the insert and a pressing pin for demolding are installed inside the upper mold so that they can protrude into the upper mold via compression springs, and each of the above pins is pushed into the upper mold against the elastic force of these springs. A one-piece device comprising wires for pulling, and a wire steering device attached to the upper die, which can pull one wire while simultaneously relaxing the other wire, and vice versa. Foam mold.