JPH0375019B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an annular cavity in which a window plate made of tempered glass (including partially tempered glass) is used as an insert and window frame rubber is integrally bonded to the outer periphery of the window plate. Regarding the improvement of a mold for molding rubber window frames, in which the upper mold and the lower mold have glass contact surfaces that grip the central part of the window pane, for example, the mold is used to integrally form a weather strip on a vehicle window pane. It is suitable. The following will explain the case of forming a weather strip on the outer periphery of a vehicle window panel as an example.

<Prior art> From the standpoint of ease of assembly, sealing, and flushing, an adhesive layer is formed on the outer periphery of the window plate where the weather strip body is to be joined, and this window plate is molded into a mold. By injecting a polymeric elastic material into the formed cavity and curing it,
A method has been proposed in which an annular weather strip body is integrally formed on the outer periphery of a window plate (see Japanese Patent Application Laid-Open No. 100022/1983). The polymeric elastic material is a rubber material such as EPDM or CR, or a thermoplastic elastomer material such as PVC or polyolefin.

Here, the mold 1 has an upper mold 3 as shown in FIG.
and a lower mold 13, each having glass contact surfaces 5, 15 and cavity forming surfaces 7, 17. Then, when clamping the mold, the window plate 11 is held and set by the respective glass contact surfaces 5 and 15, and an elastic polymer material is injected into the annular cavity 8 from the gate 9 to apply the weather strip to the outer periphery of the window plate 11. Molded into an integrally bonded state.

<Problems to be Solved by the Invention> However, as shown in the figure, after the window plate 11 is gripped by the glass contact surfaces 5, 15 of the upper and lower molds 3, 13 and the polymeric elastic material is injected and hardened, the mold is opened. Then window board 11
may be damaged. This is thought to occur during mold clamping or material injection due to deformation of the window plate 11 or the like. However, the operator cannot detect such damage to the window plate 11. This is because the window panel 11 is covered with the mold 1 and cannot be visually inspected, and it is also impossible to distinguish the sound of glass breaking in a noisy workplace. Since this window plate 11 is often made of tempered glass from the viewpoint of ensuring safety, the entire surface of the window plate 11 becomes cracked due to the above-mentioned breakage, and glass fragments and fine powder fall into the cavity. When the polymeric elastic material is injected into the cavity 8 in this state, glass fragments and fine powder move on the cavity forming surface 17 (or 7) while being subjected to injection pressure as the material flows. As a result, the cavity forming surface 17 is damaged and the mold 1 becomes unusable. Therefore, it is necessary to repair the cavity forming surface 17 of the mold 1, but this not only hinders the continuous production of products, but also has the problem that the repair of the mold increases the manufacturing cost of the product.

<Means for Solving the Problems> As a result of intensive studies to solve the above problems, the inventors of the present invention found that when the window board was damaged and the entire structure became cracked, it was possible to deform it with a small load. After realizing that this could be done, we came up with the present invention having the following configuration.

That is, either the upper mold or the lower mold has a pressing pin embedded in the glass abutting surface to press the window plate, and when the position of the pressing pin is detected and the pressing pin protrudes from the glass abutting surface, the glass Glass breakage detection means consisting of a pressure pin position sensor that outputs a crack signal is disposed, and the other of the upper mold or the lower mold has a concave portion formed in the glass contacting surface thereof in the direction in which the pressure pin protrudes. It is a mold.

<Function> With the above configuration, when the window plate, which is an insert, is damaged during mold clamping, etc. and the entire window plate becomes cracked, the window plate is partially deformed toward the recess due to the pressing force of the pressing pin, and the window plate is pressed. The pin protrudes from the glass contact surface. Then, the pressure pin position sensor is activated and outputs a glass breakage signal, which activates an alarm device or activates a stop device to stop the weather strip forming device.
Therefore, the flow of material within the mold cavity is stopped and the cavity forming surface is prevented from being damaged by glass fragments.

<Examples> Examples of the present invention will be described below.
Incidentally, the same parts as in the conventional example are given the same reference numerals and the explanation will be omitted.

The mold 21 of the embodiment is a conventional mold, and is characterized in that the upper mold 3 is provided with a glass breakage detection means 23. The glass breakage detection means 23 consists of a pressing pin 25 and a pressing pin position sensor 33. The pressing pin 25 has a flange portion 27 and a sensor pressing rod 28 at its upper end. The pressing pin 25 is inserted into a vertically bored through hole 29 from a position near the end of the glass contact surface 5 and corresponding to the upper part of the cavity 8 so as to be movable in the vertical direction. . Note that the upwardly opening portion of the through hole 29 has a large diameter so as not to interfere with the flange portion 27. Compression coil springs 31 and 32 are disposed between the flange portion 27 and the periphery of the opening 39 of the casing 38 fixed to the upper surface of the upper mold 3. The pressing pin 25 is urged downward in the illustrated example by the springs 31 and 32, and comes into a state of pressing the window plate 11. Note that the urging force of the springs 31 and 32 is strong enough to deform the window plate 11 in a cracked state. If it is too strong, the cracked window plate 11 may be crushed, so it is not preferable. In the embodiment, the springs 31 and 32 were selected so that the pressing pin 25 buried in the glass contact surface 5 presses the window plate 11 with a pressure of 3 to 5 kg/cm ² including its own weight. Of course, the means for applying the pressing force of the pressing pin 25 to the window plate 11 is not limited to the coil springs 31 and 32, but it is also possible to use a member having spring elasticity such as rubber or an air action.
It is also possible to use only its own weight.

The pressing pin position sensor 33 detects the vertical position of the pressing pin 25 and outputs a glass breakage signal when the lower end of the pressing pin 25 protrudes from the glass contact surface 5. In this embodiment, a non-lock type push button switch is used, and it does not operate when the button 34 is pressed upward by the sensor pressure rod 28 of the pressure pin 25, but when the pressure is released as shown by the imaginary line in the example. It now works and outputs a glass breaking signal. This glass breakage signal is sent to an alarm device 35 such as a lamp via a control circuit (not shown).
This is input to the stop device 37 which emergency stops the operation of the injection molding machine for molding the weather strip. The control circuit described above is interlocked with the opening/closing device for the mold 21, and operates only when the mold 21 is in the closed state.

On the other hand, a cavity 8 exists in the lower mold 13 as a recess in the direction in which the pressing pin 25 projects.

Next, the function of the mold 21 of the embodiment will be explained.

First, as shown in FIG. 2, the glass contact surface 1 of the lower mold 13
5. Place the window plate 11 on the window plate 5. On the other hand, in the upper mold 3, the pressing pin 25 is in a state of protruding from the glass contact surface 5 due to the urging force of the springs 31 and 32. In addition, in the mold opening state, the control circuit of the press pin position sensor 33 is not activated, so even if the press pin 25 is in the state of protruding from the glass contact surface 5, the alarm device 35 is not activated.
etc. do not work. Next, when the upper mold 3 and the lower mold 5 are clamped, the pressing pin 25 is pressed against the side surface of the window plate 11 and embedded into the through hole 29. Simultaneously with mold clamping, the control circuit for the press pin position sensor 33 is turned on.

When the mold clamping is performed normally and the window plate 11 is not damaged during material injection, the pressing pin 25 is maintained embedded in the glass contact surface 5 by the window plate 11. Therefore, the button 34 is pressed by the sensor pressing rod 28, and the pressing pin position sensor 33 does not operate. In this case, an elastic polymer material is injected into the cavity 8 and normal molding operations are performed.

On the other hand, if an abnormality occurs during mold clamping or material injection and the window plate 11 is damaged, the entire window plate becomes cracked. In this state, the window plate 11 easily deforms under load. Therefore, the portion of the window plate 11 that is being pressed by the pressing pin 25 is deformed downward as shown by the virtual two-dot chain line in the figure, and the pressing pin 25 is in a state of protruding from the glass abutting surface 5. Then, the sensor pressing rod 28 descends and the button 34 is released from being pressed, and the pressing pin position sensor 33 outputs a glass breakage signal. Then, the warning lamp 35 lights up due to the glass breakage signal, and
A stop device 37 is provided to stop the operation of the injection molding machine.
is activated. In this state, the upper mold 3 is opened and the cracked window plate 11 is removed, and the cavity 8 is removed.
Use a vacuum cleaner to remove any broken glass that has fallen inside. Therefore, the cavity forming surfaces 17, 7 are not scratched. Then, a new window plate 11 is set in preparation for the next molding operation.

Incidentally, the window frame rubber molding mold of the present invention is not limited to the above-mentioned embodiment, and the following modifications are possible.

(A) In the mold 41 shown in FIG. 3, the position of the press pin 25 is shifted to the right side in the example of the figure in the mold 41 shown in FIG. In this configuration, a recess 43 is formed in the protruding direction. When the window plate 11 is deformed in a cracked state by being pushed by the pressing pins 25, glass fragments tend to fall, so with this mold 41, the amount of glass that falls into the cavity 8 is reduced compared to the one in FIG. and become less.

(a) In the mold 41 shown in FIG. 3, a glass breakage detection means can be provided in the lower mold 13, and a recess can be formed in the upper mold 3.

(C) The through hole 29 may be formed at an angle and the pressing pin 25 may be inserted into the hole.

(d) The glass breakage signal will be input only to the alarm device, and the injection molding machine may be stopped manually. Alternatively, a configuration may be adopted in which the glass breakage signal is input only to the stop device of the injection molding machine.

Further, the present invention is not limited to forming a weather strip on a window plate for a vehicle, but can also be used, for example, when forming a window frame rubber on a viewing window of a machine tool or the like. In addition, the forming materials for window frame rubber are not limited to rubber materials such as EPDM and CR, but also PVC,
It should be noted that thermoplastic elastomer materials such as polyolefins are also included.

<Effects of the Invention> As explained above, in the window frame rubber molding mold of the present invention, one of the upper mold and the lower mold is provided with glass breakage detection means consisting of a pressing pin and a pressing pin position sensor. On the other hand, a concave portion is formed in the glass contacting surface in the direction in which the pressing pin protrudes. As a result, when the tempered glass window plate that is the insert is damaged during mold clamping, etc., and the entire window plate is cracked, the window plate is partially deformed toward the recess due to the pressing force of the pressing pin, and the window plate is pressed. The pin will now protrude from the glass contact surface. Then, a glass breakage signal is output from the glass press pin position sensor to an alarm device and/or a stop device that stops the weather strip forming device, and when such window plate breaks, the injection of the polymeric elastic material is immediately stopped. be able to. Therefore, glass fragments that fall into the cavity due to breakage of the window plate can be prevented from moving along the cavity forming surface with the flow of the polymeric elastic material and damaging the cavity forming surface.

As described above, according to the tempered glass insert molding mold of the present invention, even if the tempered glass window insert is damaged due to some abnormality, the cavity forming surface will not be damaged, so the mold can be reused as is. This improves product production efficiency. Further, since mold repair is not necessary, manufacturing costs are reduced.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention, FIG. 1 is a cross-sectional view of the mold 21 in a closed state, FIG. 2 is a cross-sectional view of the mold in an open state, and FIG. FIG. 4 is a sectional view of the mold 41 in a clamped state, and FIG. 4 is a sectional view of the conventional mold 1 in a clamped state. 1, 21, 41... Mold, 3... Upper mold, 5, 1
5...Glass contact surface, 7, 17...Cavity forming surface, 11...Window plate, 13...Lower mold, 23...Glass crack detection means, 25...Press pin, 33...
Pressing pin position sensor, 35...Alarm device, 37...
...Stopping device.

Claims (1)

[Scope of Claims] 1. An annular cavity in which a tempered glass window plate is used as an insert and a window frame rubber is integrally connected to the outer periphery of the window plate, and a glass that grips the center portion of the window plate in an upper mold and a lower mold. The mold has a contact surface, and one of the upper mold and the lower mold has a pressing pin embedded in the glass contacting surface to press the window plate, and a position of the pressing pin is detected. , a glass breakage detecting means is disposed including a press pin position sensor that outputs a glass breakage signal when the press pin protrudes from the glass contact surface; A mold for molding rubber for a window frame, characterized in that a concave portion in the direction in which the pressing pin protrudes is formed on the glass contact surface. 2. The window frame rubber molding die according to claim 1, wherein the annular cavity serves as the recess.