WO2019150582A1

WO2019150582A1 - Clamping device for injection molding

Info

Publication number: WO2019150582A1
Application number: PCT/JP2018/003842
Authority: WO
Inventors: 深作安井
Original assignee: ＣＳＧＩｎｖｅｓｔｍｅｎｔｓ株式会社
Priority date: 2018-02-05
Filing date: 2018-02-05
Publication date: 2019-08-08
Also published as: JPWO2019150582A1; JP6731066B2

Abstract

It is necessary to match the center of a nozzle of an injection molding device and the center of a rubber member, without generating resistive force, through an operation of matching the nozzle of the injection molding device to a sprue of the rubber member. The problem is solved by this clamp device for an injection molding device in which wax stored inside a tank passes through a nozzle to be injected through a sprue into a rubber mold, inside of which are provided a sprue runner and the sprue communicating with the sprue runner, wherein the rubber mold is formed from two or more rubber members, and each of the two or more rubber members engage at dividing surfaces to form the rubber mold. The clamping device is provided with: a bed which has a loading surface for loading the rubber mold and can move in the extension direction of the nozzle; a pressing device which presses the rubber mold against the bed so that additional load is applied to the dividing surfaces of the rubber mold; and an elastic device which can move the head up and down integrally with the pressing device.

Description

Clamp device for injection molding equipment

The present invention relates to a clamping device for an injection molding device.

In the wax casting using the lost wax injection molding apparatus, the molten liquid resin material (wax) stored in the wax storage tank of the apparatus is supplied to the nozzle. Liquid wax melted from the tip of the nozzle is injected into a rubber mold held by a clamp device and solidified. This apparatus is used for casting jewelry and the like. Since products such as jewelry are complicated in shape and the like, problems such as undercut are likely to occur, and flexible mold materials such as silicone rubber or natural rubber are used.

FIG. 6 shows a clamp device 52 used in a lost wax injection molding device 50 as a conventional representative example. Liquid wax is injected from the wax storage tank 51 of the injection molding apparatus 50 into the rubber mold 53 through the nozzle 55. The rubber mold 53 is, for example, divided into two upper and lower

rubber mold members

53 a and 53 b, and has a split surface 53 d on the side surface of the rubber mold 53. The dividing surface 53d has an arbitrary shape, but has a jagged shape so that it can be easily and uniquely combined. The

rubber mold members

53a and 53b are properly and properly engaged in a state where the dividing surfaces 53d are well matched. A runner is formed in the rubber mold 53 in a state where the

rubber mold members

53a and 53b are closely assembled. The runner is connected to the spout 53c on the side of the rubber mold 53, and has a shape that can receive the tip of the nozzle 55. For example, the side surface of the tip of the nozzle 55 has a tapered truncated cone shape with a tapered surface, and the gate 53c on the side surface of the rubber mold 53 has a truncated cone-shaped hole shape along the tapered surface. When the tip surface of the nozzle 55 is properly inserted along the inner surface of the hole of the gate 53c of the rubber mold 53, the state where the

rubber mold members

53a and 53b are properly engaged is maintained.

On the other hand, in order to manufacture a high-quality wax molded product, it is necessary to inject an appropriate amount of liquid wax into all the runners from the thick runner to the thin runner, and the

rubber mold members

53a and 53b are provided. It is necessary to press the gate 53c against the nozzle 55 in a state where they are pressed with appropriate pressures in the respective combining directions. If an inappropriate force is applied to the rubber mold 53 or the contact between the gate 53c and the nozzle 55 is inappropriate, an appropriate amount of liquid wax does not reach all the runners, or the wax leaks. Arise. Therefore, the tip of the nozzle 55 needs to be accurately inserted into the gate 53c of the rubber mold 53 in the gate 53c. To be accurately inserted means that the horizontal axis and the vertical axis of the nozzle 55 and the gate 53c of the rubber mold 53 are aligned with each other.

For example, in a positional relationship such as the sprue 53c central axis 53e of the center line NZ ₀ and the rubber mold 53 of the nozzle 55 matches (FIG. 7A), when the nozzle 55 is inserted into the sprue 53c of the rubber mold 53 (Fig. 7B) The gate 53c of the rubber mold 53 properly receives the nozzle 55, and no force is generated to separate the

rubber mold members

53a and 53b by separating the dividing surface 53d. However, the central axis 53e and the deviation has a positional relationship of the sprue 53c centerline NZ ₀ and the rubber mold 53 of the nozzle 55 (FIG. 7C), when the nozzle 55 is inserted into the sprue 53c of the rubber mold 53 (Fig. 7D ), The nozzle 55 that has entered the gate 53c of the rubber mold 53 gives a force that separates the split surface 53d to the

rubber mold members

53a and 53b, and generates a force that separates the

rubber mold members

53a and 53b from each other. is there. In particular, in the conventional clamping device, there is a case where the center axis 53e of the sprue 53c of the rubber mold 53 is performing the axial alignment by tilting with respect to the center line NZ ₀ of nozzles 55. As described above, in the aspect in which the rubber mold 53 is inclined with respect to the nozzle 55, a force that separates each member of the

rubber mold members

53a and 53b is remarkable when one of the

rubber mold members

53a and 53b is pushed by the nozzle. become.

Rubber mold member 53a, in order not to generate a force of separating and 53b includes a center line NZ ₀ of nozzle 55, the central axis 53e of the sprue 53c is a parallel, and the vertical and horizontal position To match. However, in general, in wax injection molding, a plurality of rubber dies 53 are used in order to improve the efficiency of the process by parallel work. At this time, each of the plurality of rubber dies 53 has a different thickness depending on the design or due to manufacturing tolerances. Therefore, in principle, every single wax injection molding, the center line NZ ₀ and such alignment step as a sprue and the central axis 53e of 53c matches the rubber mold 53 of the nozzle 55 is required.

In this alignment process, even the center axis 53e and the deviation has a positional relationship of the sprue 53c centerline NZ ₀ and the rubber mold 53 of the nozzle 55 (FIG. 7C), depending on the entry into sprue 53c of the nozzle 55 Te, the central axis 53e of the sprue 53c of the rubber mold 53 is matched automatically in parallel to the center line NZ ₀ of nozzles 55, the nozzles 55 when entering along the sprue 53c of the rubber mold 53, the rubber mold 53 There is a need for a clamping device that does not apply a load that separates the dividing surface 53d. For this purpose, it is necessary for the rubber mold 53 to be movable without resistance in a direction perpendicular to the moving direction of the nozzle, generally in the vertical direction.

In order to make the rubber mold 53 movable without resistance in a direction perpendicular to the nozzle moving direction, generally in the vertical direction, simply press the rubber mold 53 between the

pressing members

60a and 60b as shown in FIG. A device that holds each of 60a and 60b freely by springs S1 and S2 is conceivable. However, in this apparatus, since the synchronization between the springs S1 and S2 is not guaranteed, the pressing member 60a coupled to the spring S1 and the pressing member 60b coupled to the spring S2 are composed of the rubber mold member 53a and the rubber mold member 53b. There is a problem that the force for ensuring contact with the head cannot be kept constant.

On the other hand, a clamping device in an injection molding apparatus that injects the wax from the pouring gate into a rubber mold having a pouring passage and a pouring gate communicating with the pouring passage through a nozzle from a tank that stores wax therein. The rubber mold is formed of at least two or more rubber mold members, and the rubber mold is formed by combining each of the at least two or more rubber mold members on a dividing surface. A bed having a placement surface on which the mold is placed, the bed movable in the direction in which the nozzle extends, and the bed so that a load is applied to the split surface of the rubber mold. This is solved by a clamping device comprising a pressing device that presses a rubber mold and an elastic device that can move the bed up and down integrally with the pressing device.

According to the present invention, the center axis of the nozzle coincides with the center axis of the rubber mold without causing any resistance by the operation of matching the nozzle of the injection molding apparatus and the pouring gate position of the rubber mold.

It is the schematic diagram which showed embodiment of the alignment concept of the clamp apparatus of this invention. It is the schematic diagram which showed embodiment of the alignment concept of the clamp apparatus of this invention. It is the schematic diagram which showed the concept of the alignment of the clamp apparatus of this invention. It is the schematic diagram which showed the concept of the alignment of the clamp apparatus of this invention. It is a figure of the clamp apparatus of one Example which actualized the alignment mechanism of this invention. It is a figure of the clamp apparatus of one Example which actualized the alignment mechanism of this invention. It is the figure which showed the front-end | tip part of the nozzle in embodiment of this invention, and the relationship of a rubber mold, Comprising: The state before a nozzle is inserted in a gate is shown. It is the figure which showed the front-end | tip part of the nozzle in embodiment of this invention, and the relationship of a rubber mold, Comprising: The state which the nozzle began to insert in the gate is shown. It is the figure which showed the relationship between the front-end | tip part of a nozzle and rubber mold in embodiment of this invention, Comprising: The latter half state in which the nozzle began to be inserted in the gate is shown. It is the figure which showed the relationship between the front-end | tip part of a nozzle and rubber mold in embodiment of this invention, Comprising: The nozzle has shown the state which insertion was completed in the gate. It is a figure of the clamp apparatus of the conventional injection molding apparatus. It is the schematic diagram which showed the state which the nozzle has left | separated from the rubber type | mold in the positional relationship that the pipe line center axis | shaft of a nozzle and the central axis | shaft of a rubber-type gate match. It is the schematic diagram which showed the state which the nozzle joined to the rubber mold in the positional relationship which the pipe line central axis of a nozzle and the central axis of a rubber mold spout correspond. It is the schematic diagram which showed the state which the nozzle has left | separated from the rubber mold in the positional relationship which the center line of the pipe line of a nozzle and the central axis of a rubber mold spout has shifted | deviated. It is the schematic diagram which showed the state which the nozzle joined to the rubber type | mold in the positional relationship which the center line of the pipe line of a nozzle and the center axis | shaft of a rubber-type gate has shifted | deviated. It is the figure which conceptualized the general solution means.

1A and 1B, an embodiment of the clamping device of the present invention will be described. 1A and 1B are diagrams showing an embodiment of the alignment concept of the clamping device of the present invention. The clamping device according to the present invention has a rubber mold 53 provided with a runner (broken line portion) and a sprue 53c communicating with the runner from a tank (not shown) containing wax therein through a nozzle 55. It is used in an injection molding apparatus that injects wax from the gate 53c. The rubber mold 53 is formed of

rubber mold members

53a and 53b composed of at least two or more, and is formed by combining each of the at least two or more rubber mold members on a dividing surface. The gate 53 c of the rubber mold 53 has a slope whose diameter decreases toward the inside of the rubber mold 53.

The clamp device has a placement surface 61a on which the rubber mold 53 is placed, and a bed 61 that is movable in the direction in which the nozzle 55 extends. The nozzle 55 has a tapered portion in the direction of the bed 61 along the direction in which the nozzle 55 extends, and a curved surface in contact with the slope of the gate 53 c of the rubber mold 53. The tip of the nozzle 55 contacts the slope of the gate 53c of the rubber mold 53 when the nozzle 55 is inserted into the gate 53c of the rubber mold 53.

The clamp device includes a pressing plate 62 and a pressing device 63 that presses the pressing plate 62 against the bed 61. When the rubber mold 53 is disposed between the bed 61 and the pressing plate 62 and the pressing plate 63 is moved with respect to the bed 61 by the pressing device 63 and the rubber mold 53 is pressed, the split surface 53d of the rubber mold 53 is pressed. The weight is added.

The bed 61 is coupled to the elastic device S3, and the elastic device S3 has an elastic force that allows the bed 61 to move up and down without resistance. The elastic device S3 is a spring or a bellows. The elastic force that allows the bed 61 to move up and down without resistance is balanced against the weight of the bed 61 and the pressing device 63, and the bed 61 can be maintained in a neutral state without being lowered or raised. This means that the elastic force can move up and down without resistance. In practice, this means that the elastic coefficient of the elastic device S3 is almost zero. FIG. 2A shows a state in which the nozzle 55 is inserted into the gate 53c of the rubber mold 53 and fitted into the gate 53c. Thus, the nozzle 55 moves relatively along the slope which is the inner wall surface of the gate 53c of the rubber mold 53 from the nozzle position 55a to the nozzle position 55b until the nozzle 55 is fitted to the gate 53c.

As shown here, the elastic force of the elastic device S3 is such that when the nozzle 55 is inserted into the gate 53c of the rubber mold 53, the nozzle 55 presses the slope of the inner wall of the gate 53c of the rubber mold 53 in the vertical direction. The force component (Fpv−Ffv) of the difference between the component force component Fpv of the nozzle and the component force component Ffv in the vertical direction of the frictional force Ff received by the nozzle 55 from the slope of the gate 53c of the rubber mold 53 is approximately the same or smaller. Is set as follows. By setting in this way, the bed 61 can be raised and lowered without resistance.

2B shows that when the nozzle 55 is inserted into the gate 53c of the rubber mold 53, the initial position of the nozzle 55 with respect to the gate 53c of the rubber mold 53 is different from the elastic force in the difference between the short distance position 55c and the far distance position 55d. It is the figure which showed the difference. As shown in FIG. 2B, the distance between the center line O of the sprue 53c centerline NZ ₀ and the rubber mold 53 when the initial position of the nozzle 55 is short-range position 55c is x1, the initial position of the nozzle 55 far the distance between the center line O of the sprue 53c centerline NZ ₀ and the rubber mold 53 in the case of distance position 55d is assumed to be x2. x2 is greater than x1. In this case, the magnitude of the elastic force of the elastic device S3 is generally proportional to the distance between the center line O of the sprue 53c centerline NZ ₀ and the rubber mold 53 of the nozzle 55. For example, when the spring or bellows is the elastic device S3, it is proportional to the elastic coefficient k of the elastic device S3. Therefore, when the distance between the center line O of the sprue 53c centerline NZ ₀ and the rubber mold 53 of the nozzle 55 is x1 is k · x1, the distance is k · x2 in the case of x2. Since x2 is larger than x1, the further away from the center line O, the greater the elastic force of the elastic device S3, and a greater force is required to cancel this elastic force.

That is, the elastic force increases as the center line NZ ₀ of the nozzle 55 becomes farther from the center line O of the gate 53 c of the rubber mold 53. For this reason, in the design of the elastic device S3, it is difficult to set an elastic force that can move up and down without resistance over a wide range. In the clamp device, it is preferable that the thickness of the rubber mold 53 can be freely set. Therefore, in order to set an elastic force that can be lifted and lowered without resistance over a wide range, in addition to the elastic device S3 as shown in FIG. A lifting device S4 can be further arranged. As shown in FIG. 1B, the preliminary elevating device S4 is arranged, and the position of the elastic device S3 is raised in advance by the preliminary elevating device S4 so that the initial position of the nozzle 55 is always close to the center line O of the gate 53c of the rubber mold 53. Lower. That way, regardless of the thickness of the rubber mold 53, it is possible to the nozzle 55 from the center line NZ ₀ closer to the center line O of the sprue 53c of the rubber mold 53 and becomes, by the elastic force of the elastic device from S3 therefrom It can be moved up and down without resistance. Further, a position detection device 64 such as a proximity sensor or a potentiometer is arranged in the clamp device so that the position of the bed 61 can be detected, for example. The preliminary lifting device S4 is operated according to the output, and the bed 61 is moved so that the initial position of the nozzle 55 is close to the center line O of the gate 53c that can be lifted and lowered without resistance by the elastic force of the elastic device S3. .

(Example 1)
Next, Example 1 to which the above embodiment is specifically applied will be described with reference to FIG. FIG. 3 shows the clamping device 1a of the first embodiment. The clamp device 1a is the same in that it is applied as a part of the conventional injection molding device 50 of FIG. The nozzle 5 is a part of the injection molding apparatus 50 shown in FIG. The rubber mold 3 is the same as that used in the conventional injection molding apparatus 50 shown in FIG. Example 1 corresponds to an example in which the elastic device S3 is the elastic device 7 that is a spring and the preliminary lifting device S4 is the pneumatic cylinder 12 in the above embodiment. The functions of Example 1 are those described in the embodiment.

The clamping device 1a includes a pressing plate 2 and a bed 4 disposed so as to face the pressing plate 2. The rubber mold 3 has a first surface 3a and a second surface 3b parallel to the first surface 3a. A side surface 3c is formed between the first surface 3a and the second surface 3b. The rubber mold 3 is typically a flat rectangular parallelepiped or a cylindrical shape. A runner is drilled inside the rubber mold 3, and a gate 3d that is fluidly connected to the runner is disposed on the side surface 3c. 5A to 5D show the positional relationship between the nozzle 5 of the injection molding apparatus and the gate 3d of the rubber mold 3. FIG. The gate 3 d is a tapered hole from the side surface of the rubber mold 3 toward the inside of the rubber mold 3. The nozzle 5 has a tapered shape toward the tip of the nozzle 5. The opening angle α at the tip of the nozzle 5 is smaller than the opening angle β of the gate 3d. The tip of the nozzle 5 has a spherical shape. Therefore, when the nozzle 5 is inserted into the gate 3d, the spherical surface portion of the nozzle 5 comes into proper contact with the gate 3d.

The bed 4 has a horizontal and flat mounting surface 4a, and the mounting surface 4a supports the rubber mold 3 in a state where the second surface 3b of the rubber mold 3 is in contact. The rubber mold 3 faces upward so as to face the pressing plate 2 while being placed on the placement surface 4a. The pressing plate 2 can be moved up and down by a hydraulic cylinder 6 as a pressing device. The pressing plate 2 can come into surface contact with the first surface 3a. Thereby, in a state where the rubber mold 3 is placed on the placement surface 4a, the pressing plate 2 presses the first surface 3a, and the gap between the first surface 3a and the second surface 3b of the rubber mold 3 is reached. Pressure.

The nozzle 5 extends horizontally from the injection molding device. The bed 4 of the clamping device 1 a has a translation device 8. The translation device 8 moves the bed 4 of the clamping device 1a together with the pressing plate 2 and the hydraulic cylinder 6 so as to contact the nozzle 5 or away from the nozzle 5 along the direction in which the nozzle extends. Can do. That is, the bed 4 is brought into contact with the nozzle 5 or away from the nozzle 5 along the direction in which the nozzle extends in a state where the pressure is applied to the rubber mold 3 with the pressing plate 2 by the translation device 8. Move to.

Furthermore, an elastic device 7 is arranged below the bed 4 of the clamp device 1a. In the first embodiment, a helical spring is employed as the elastic device 7. The elastic device 7 is integral with each of the pressing device and the pressing plate 2 and can swing in a direction perpendicular to the direction in which the nozzle 5 extends. The elastic device 7 is such that the rubber die 3 is placed on the placement surface 4a and repels by a light force that can be pushed down by a human hand, and at least the tip of the nozzle 5 has an opening diameter of the gate 3d. It has an elastic force that can swing within the range.

Subsequently, the relationship between the rubber mold 3 and the nozzle when the clamp device 1a is used will be described with reference to FIGS. 5A to 5D. A predetermined pressure is applied to the rubber mold 3 by the pressing plate 2 on the first surface 3a and the second surface 3b. Under this pressure, the bed 4 is balanced by the elastic device 7 so that the tip of the nozzle 5 can swing within the range of the opening diameter of the gate 3d regardless of the weight of the rubber mold 3. Yes.

In this state, the bed 4 is moved closer to the nozzle by the translation device 8. Then, as the bed 4 moves, the tip of the nozzle 5 is inserted into the opening of the gate 3d of the rubber mold 3. At this time, the sphere at the tip of the nozzle 5 contacts the wall surface of the gate 3d. Further, when the bed 4 is brought closer to the nozzle 5 by the translation device 8, the spherical portion at the tip of the nozzle 5 pushes the wall surface of the gate 3 d, and the rubber mold 3 is pushed down together with the bed 4. Then, as the bed 4 approaches the direction of the nozzle 5, the spherical portion at the tip of the nozzle 5 moves relatively along the wall surface of the gate 3 d toward the center of the gate 3 d, and finally the nozzle 5. The center of the pipe line at the tip and the central axis of the pipe line of the gate 3d coincide in parallel. As described in the embodiment, since the elastic force of the elastic device 7 can be ignored when the nozzle 5 and the wall surface of the gate 3d of the rubber mold 3 are in contact with each other, the vertical translation device 8 causes the nozzle 5 to be rubber. This is because the frictional force that the nozzle 5 receives from the wall surface of the gate 3d of the rubber mold 3 is sufficiently small with respect to the force pushing the mold 3.

Accordingly, when the bed 4 on which the rubber mold 3 is placed is brought close to the nozzle 5 together with the pressing plate 2 that presses the rubber mold 3 in the clamp device 1a, the bed 4 is not limited by the elastic device 7 and has no resistance. Since it can be swung by a weak force, the contact point between the nozzle 5 and the gate 3d moves along the wall surface of the gate 3d without resistance toward the central axis of the gate 3d along the inclination of the nozzle 5, The center axis of the nozzle 5 and the center axis of the gate 3d can be aligned. Accordingly, when the step of connecting the nozzle 5 and the gate 3d of the rubber mold 3 is performed by using the clamping device 1a of the present invention, the center of the pipe line at the tip of the nozzle 5 and the center of the pipe line of the gate 3d. The alignment process can be realized at the same time.

Further, as described in the above embodiment, the bed 4 is moved up and down by the pneumatic cylinder 12 which is a preliminary lifting device, so that the center axis of the nozzle 5 and the center axis of the gate 3d can be adjusted to substantially match. Become. In particular, at least in the vertical direction, the bed 4 is raised and lowered by adjusting the pressure in the pneumatic cylinder 12 to such a position that the tip of the nozzle 5 is positioned at the opening of the gate 3d on the side surface of the rubber mold 3. Coarsely adjust the bed position. By doing so, the tip of the nozzle 5 is always balanced so that it can swing within the range of the opening diameter of the gate 3d. Further, in the vertical direction, the bed 4 is moved up and down by the pneumatic cylinder 12 to a position where the tip of the nozzle 5 is positioned at the opening of the gate 3d on the side surface of the rubber mold 3 to adjust the position of the bed. , Rough adjustment to the place where the reaction force due to the elastic force is the smallest becomes possible. Further, a potentiometer 11 is disposed as a position detection device, and the position of the nozzle 4 is swung within the range of the opening diameter of the gate 3d by the pneumatic cylinder 12 by detecting the position of the bed 4 in the vertical direction. Adjustments can be made automatically. The potentiometer 11 detects height information on the circuit board, operates the pneumatic cylinder 12 according to the height information, and moves the bed 4 up and down, so that the central axis of the nozzle 5 and the central axis of the gate 3d are approximately the same. Adjust to match.

(Example 2)
Next, Example 2 in which the above embodiment is specifically applied will be described with reference to FIG. FIG. 4 shows a clamp device 1b according to the second embodiment. The clamp device 1b is substantially the same as the clamp device 1a of the first embodiment. Therefore, different parts will be described here. The clamping device 1b of Example 2 corresponds to an example in which the bellows 10 is employed as the elastic device S3 in the above embodiment. Theoretically, the bellows 10 has an elastic coefficient of almost zero, and it is easier to set the elastic coefficient than a helical spring whose elastic coefficient is determined as a finite value depending on the material and geometric shape. It becomes very advantageous. The function of the second embodiment is the same as that described in the first embodiment, and the bellows 10 is employed as the elastic device S3.

The present invention can be applied as a clamping device of an injection molding device represented by a lost wax casting device.

1,52

Clamp device

2,62

Press plate

3,53

Rubber mold

4,61

Bed

5,55 Nozzle 6 Hydraulic cylinder 7, S3 Elastic device 8 Translation device 10 Bellows 11 Potentiometer 12 Pneumatic cylinder 63 Press device

Claims

A clamp device in an injection molding apparatus that injects the wax from the gate into a rubber mold having a runner and a gate connected to the runner from a tank that stores wax therein via a nozzle,
The rubber mold is formed of at least two or more rubber mold members, and the rubber mold is formed by combining each of the at least two or more rubber mold members on a dividing surface,
The clamping device is
A bed having a placement surface on which the rubber mold is placed and movable in a direction in which the nozzle extends;
A pressing device that presses the rubber mold so that a load is applied to the split surface of the rubber mold with respect to the bed;
A clamp device comprising: an elastic device capable of moving the bed up and down integrally with the pressing device.
The clamping device according to claim 1,
The clamp device has an elastic force that allows the bed to move up and down without resistance.
The clamping device according to claim 2,
The bed is a clamp device in which the rubber mold is integrated with the bed and the pressing device and is movable in the direction of the nozzle.
The clamping device according to claim 3,
The gate of the rubber mold has a slope whose diameter decreases toward the inside of the rubber mold,
The said nozzle has a taper-shaped part in the direction of the said bed along the direction where the said nozzle extends, and the curved surface which touches the said slope.
The clamping device according to claim 4,
When the nozzle is inserted into the gate of the rubber mold, the elastic force includes a component component in a vertical direction of a force by which the nozzle presses the inclined surface of the gate of the rubber mold, and the nozzle is the rubber mold. A clamping device that is set to be substantially the same as or smaller than a difference between a vertical component of a frictional force received from the slope of the gate and the vertical direction.
The clamping device according to claim 2,
The clamp device has a position detection device and a preliminary lifting device,
The position detecting device detects the position of the bed;
The preliminary lifting and lowering device is a clamp device that lifts and lowers the bed so that the position of the bed falls within the range of the gate according to the position of the bed detected by the position detection device.
The clamping device according to claim 1,
The clamping device, wherein the elastic device is a spring.
The clamping device according to claim 1,
The clamping device, wherein the elastic device is a bellows.