JP2010162717A - Vacuum forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum forming device capable of providing a required number of openings in a required position in a peripheral wall, and capable of carrying out satisfactorily work for molding, maintenance and the like, in the vacuum forming device provided with the peripheral wall to surround a space between the first fixed plate and the second fixed plate, to form a vacuum chamber in an inside thereof. <P>SOLUTION: This vacuum forming device 10 includes a die clamping device having an upper fixed plate 12, a lower fixed plate 18, a movable plate 24, a tie rod 20 as a strength member for connecting the upper fixed plate 12 and the lower fixed plate 18. and a die clamping cylinder 14, and an evacuating device having the peripheral wall 48 for surrounding the whole space between the upper fixed plate 12 and the lower fixed plate 18, to be blocked from an outside, and for making the space serve as the vacuum chamber 50, and a vacuum pump for evacuating the vacuum chamber 50 under the condition where the movable plate 24 and a molding die 28 are positioned in an inside of the vacuum chamber 50, and a molding material is injected from an injection machine 34 to the molding die 28 in the vacuum chamber 50, so as to be molded. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vacuum forming apparatus using an injection molding machine.

Conventionally, injection molding machines have been widely used for molding rubber, resin, and the like.
In this injection molding machine, a fixed plate, a movable plate that moves forward and backward with respect to the fixed plate, and a mold clamping cylinder (pressurizing means) that pressurizes the movable plate with a molding die sandwiched between the fixed plate at the forward end. A mold clamping device is configured with a tie rod as a strength member that connects the stationary platen and the mold clamping cylinder, and the molding material is injected into the molding die from the injection machine with the mold clamped Is molded into a predetermined shape.

  By the way, for example, in the case of a rubber material, air may be contained in the rubber material injected into the mold, and the air remains as bubbles in the rubber product (rubber molded product). However, there is a problem that leads to defective rubber products.

  Therefore, in order to prevent this, or even when the shape of the rubber product, that is, the mold cavity has a complicated shape, the rubber material is spread all over the cavity, leaving the rubber material in the cavity without leaving air. In order to fill the mold, the cavity of the mold is evacuated, and a rubber material is injected into the cavity in the evacuated state and molded.

  As a vacuum forming apparatus for this purpose, a vacuum suction hole is provided in the mold, a vacuum suction pipe is connected to the mold, and the inside of the mold (that is, the cavity) is directly vacuum-sucked by a vacuum pump (evacuation means). There is known a vacuum state (strictly, a reduced pressure state) in which a rubber material is injected from a injector into a mold and molded into a predetermined shape.

  However, in this case, a vacuum suction hole must be provided in the molding die so that the molding die can be vacuum-sucked, and when the rubber material is injected into the molding die, the rubber material is in the vacuum suction hole. It will enter and cause problems such as clogging of the vacuum suction holes.

In addition, a vacuum forming apparatus as shown in FIG. 7 is also used.
In the figure, 200 is an upper fixing plate, 202 is a mold clamping cylinder (pressurizing means), 206 is a tie rod as a strength member for connecting the upper fixing plate 200 and the mold clamping cylinder 202, and 208 is guided by the tie rod 206 and moved upward. This is a movable plate that moves forward and backward in the vertical direction toward the fixed platen 200.

Reference numeral 210 denotes a molding die. The upper die 210A is held in a fixed state on the upper fixed platen 200 side, and the lower die 210B is supported on a support plate 212 provided on the movable platen 208. Move to.
The mold 210 is clamped by moving the movable platen 208 upward in the drawing and applying upward pressure to the movable platen 208 by the mold clamping cylinder 202 at the forward end.

Reference numeral 214 denotes a peripheral wall provided so as to surround the molding die 210 between the movable platen 208 and the upper fixed platen 200. The peripheral wall 214 can be expanded and contracted by a certain amount in the vertical direction.
Specifically, the peripheral wall 214 includes an upper wall 214A and a lower wall 214B. The upper wall 214A is fixed to the upper fixed plate 200 side, and the lower wall 214B is vertically fixed with respect to the upper wall 214A. It is possible to slide.

When the movable plate 208 is raised to bring the mold 210 into a clamped state, the peripheral wall 214 abuts the lower end of the lower wall 214B against the support plate 212 via a seal member, and forms a vacuum chamber 216 on the inside. To do.
Reference numeral 218 denotes an injection machine, and 220 denotes an injection cylinder in the injection machine 218.

  In this vacuum forming apparatus, the movable platen 208 is lifted, and the movable platen 208 is pressurized by the clamping cylinder 202 and the forming die 210 is clamped, and the vacuum chamber 216 is vacuum-sucked by a vacuum pump. 216 is in a vacuum state, and in this state, a rubber material is injected from the injection cylinder 220 into the mold 210 to form a rubber product.

  This vacuum forming apparatus has an advantage that it is not necessary to provide a vacuum suction hole in the mold compared with a vacuum forming apparatus in which the mold is directly vacuum-sucked. A peripheral wall 214 surrounding the mold 210 must be provided between the board 200 and the board 200.

For this reason, after the mold is opened, the peripheral wall 214 remains in the space between the movable platen 208 and the upper fixed platen 200, and the peripheral wall 214 hangs downward. There is a problem that gets in the way.
In addition, the mold 210 may be thin or thick depending on the product, but this vacuum forming apparatus has a problem that it is difficult to cope with changes in the thickness of the mold 210.

For example, if the length of the peripheral wall 214 in the vertical direction, that is, the height is configured to match that of the mold 210 having a small thickness, if the mold 210 is thick, the height of the peripheral wall 214 will be insufficient and vice versa. Further, if the height of the peripheral wall 214 is configured to correspond to a thicker one, when the mold 210 is thin, the peripheral wall 214 becomes a hindrance and the clamping cannot be performed satisfactorily, or In that case, there arises a problem that the peripheral wall 214 itself must be replaced.
In addition, a vacuum forming apparatus in which a peripheral wall that encloses a molding die alone in a mold-clamped state and forms a vacuum chamber inside the peripheral wall is disclosed in Patent Document 1 below.

  In addition to this, as a vacuum forming apparatus, the entire space between the first fixed platen and the second fixed plate at a position separated from the first fixed platen is enclosed by a peripheral wall, and the same space is blocked from the outside, and a vacuum is formed inside the peripheral wall. A chamber is formed, the vacuum chamber is evacuated by a vacuum pump, and the vacuum chamber is evacuated to a vacuum state in a state where the movable platen and the mold are located inside the vacuum chamber, and the injection machine is in that state. The following Patent Document 2 discloses a molding material that is molded by being injected into a molding die in a vacuum chamber.

  However, in the one disclosed in Patent Document 2, the first fixed platen and the second fixed platen are not connected with the tie rods, and the first fixed platen and the second fixed platen are connected with the peripheral wall itself. In addition, since the peripheral wall itself directly receives the force applied to the first fixed platen and the second fixed platen at the time of mold clamping, the peripheral wall must be composed of a high strength member. There is a problem that it is difficult to provide a large number of necessary work openings on the peripheral wall.

In this type of vacuum forming apparatus, it is necessary to provide an opening for inserting and removing the mold on the front surface (front surface), and it is desirable to provide an opening for work on the side surface and the like.
For example, work to maintain the electrical wiring cord connected to the electric heater for heating the mold or to discharge the runner generated during the injection to the outside has an opening on the side, It is more convenient and convenient to perform through the side opening.

  However, in the thing disclosed in Patent Document 2, since the peripheral wall itself is a strength member that receives the clamping force, it is difficult to provide side openings in addition to the front openings or to provide many openings as a whole. If so many openings are provided, the strength of the peripheral wall is lowered, and the mold clamping force cannot be sufficiently received.

  The case where the rubber material is injected into the mold and the rubber product is molded has been described above as an example. However, the same problem occurs when the resin material is injected into the mold as the molding material and molded.

Japanese Patent Laid-Open No. 2004-237441 JP 2006-43906 A

  In the vacuum forming apparatus in which the peripheral wall is provided so as to surround the space between the first fixed platen and the second fixed platen and the vacuum chamber is formed inside the peripheral wall, the present invention is based on such circumstances. The object of the present invention is to provide a vacuum forming apparatus that can sufficiently provide a necessary number of openings at necessary places and can perform operations such as molding and maintenance satisfactorily.

  Thus, according to the first aspect, (A) (a) the first fixed plate, (b) the second fixed plate at a position spaced from the first fixed plate, and (c) the first fixed plate. A movable platen that moves forward and backward between the platen and the second fixed platen, and sandwiches the molding die between the first fixed platen at the forward end, and (d) connects the first fixed platen and the second fixed platen. A mold clamping device comprising: a tie rod as a strength member; and (e) a pressurizing unit that pressurizes and clamps the movable plate while the mold is sandwiched between the movable platen and the first fixed platen, and (B (F) Surrounding the entire space between the first fixed platen and the second fixed platen and shutting it from the outside, and making the space a vacuum chamber, and (g) movable inside the vacuum chamber. An evacuation device having an evacuation means for evacuating the inside of the vacuum chamber in a state where the disc and the mold are positioned, and the vacuum chamber is used to remove the molding material from the injection machine Characterized in that the are without such injection to molding the mold.

  According to a second aspect of the present invention, in the first aspect, the peripheral wall is slidable in a direction opposite to the mold clamping direction in a sealed state by a seal member with respect to the first fixed plate and / or the second fixed plate. Or the peripheral wall can be expanded and contracted in the opposite direction.

  According to a third aspect of the present invention, in the second aspect, the peripheral wall has a through bolt hole, and the mold wall is clamped with respect to the first fixed plate and / or the second fixed plate in the bolt hole. The fixing bolt is fixed to the first fixing plate and / or the second fixing plate via a spring that elastically presses in a direction perpendicular to the direction, and the bolt hole is formed between the fixing bolt and the clamping direction. A gap is formed in the opposite direction, and the peripheral wall is slidable with respect to the first fixed plate and / or the second fixed plate during mold clamping based on the gap. .

Effects and effects of the invention

  As described above, in the present invention, the first fixed platen and the second fixed platen are connected to each other by the tie rods as strength members, and the entire space between the first fixed platen and the second fixed platen is defined. The vacuum chamber is surrounded by a peripheral wall and the space is cut off from the outside, and the vacuum chamber is evacuated by an evacuation means while the movable plate and the mold are located inside the vacuum chamber. None, the molding material is injected from the injection machine to the mold inside the vacuum chamber and molded.

  In such a vacuum forming apparatus of the present invention, the first fixed platen and the second fixed platen are kept connected by a tie rod as a strength member, and enclose a space between the first fixed platen and the second fixed platen. The peripheral wall that forms a sealed vacuum chamber on the inside does not need to receive a force applied to the first fixed platen and the second fixed platen at the time of mold clamping. Therefore, the peripheral wall is different from that described in Patent Document 2. It is not necessary to use a high-strength member, and it is sufficient that the peripheral wall merely has a space blocking function, and the cost required for the peripheral wall can be reduced.

In addition, since the peripheral wall is made of a strength member and does not need to receive a force during mold clamping, the front wall (front surface), left and right side surfaces, and other openings can be easily opened on the peripheral wall. Can be provided.
In the present invention, the peripheral wall forming the vacuum chamber does not need to receive a force at the time of mold clamping. Therefore, even if an opening is provided in the peripheral wall, the force receiving the force at the time of mold clamping is weakened. Such a problem does not occur.

  Thus, according to the present invention, an opening can also be provided on the side surface, so that the opening on the side surface is used as a work opening, and work for discharging runners and the like caused by maintenance and injection of the internal electrical wiring cord to the outside Can be easily performed.

  In this case, the peripheral wall can be slidably moved in the direction opposite to the mold clamping direction in a sealed state by a seal member with respect to the first fixed plate and / or the second fixed plate, or the peripheral wall itself can be expanded and contracted. It can be made possible (claim 2).

  In the vacuum forming apparatus of the present invention, a strong force generated at the time of mold clamping is received by the tie rod, and the first fixed platen and the second fixed platen are maintained connected by the tie rod. Due to the strong force, a slight elongation occurs, and it is inevitable that the first and second fixed plates are displaced slightly.

At this time, if the peripheral wall forming the vacuum chamber on the inside is non-stretchable and rigidly fixed to the first fixed plate and the second fixed plate, the peripheral wall is damaged.
However, if the peripheral wall can be slid in the direction opposite to the clamping direction with respect to the first fixed plate and / or the second fixed plate, the first fixed plate and the second fixed plate can be moved under a strong clamping force. Even if a slight displacement occurs, the displacement can be absorbed by the relative sliding movement of the peripheral wall with respect to the first fixed plate and / or the second fixed plate, and damage to the peripheral wall can be prevented.
The same applies to the case where the peripheral wall is configured to be extendable and retractable in the direction opposite to the mold clamping direction.

Further, in this case, a through-hole bolt hole is provided in the peripheral wall, and a spring that elastically presses the peripheral wall against the first fixed plate and / or the second fixed plate in the direction perpendicular to the mold clamping direction in the bolt hole. The fixing bolt is fixed to the first fixing plate or / and the second fixing plate, and a gap is formed between the bolt hole and the fixing bolt in a direction opposite to the mold clamping direction. Accordingly, the peripheral wall can be slidable with respect to the first fixed plate and / or the second fixed plate at the time of mold clamping.
By doing in this way, a surrounding wall can be slidably assembled | attached with respect to the 1st stationary plate or / and the 2nd stationary plate with a simple assembly structure.

It is front sectional drawing of the vacuum forming apparatus which is one Embodiment of this invention. It is a figure of the principal part of the fixing structure of the surrounding wall and fixed board in the embodiment. It is side surface sectional drawing of the vacuum forming apparatus in the embodiment. It is the front view and back view of the vacuum forming apparatus in the embodiment. It is the right and left view of the vacuum forming apparatus in the embodiment. It is explanatory drawing of the work procedure of the vacuum forming apparatus in the embodiment. It is a figure which shows an example of the conventional vacuum forming apparatus.

Next, an embodiment when the present invention is applied to a vacuum forming apparatus for injection molding of rubber products will be described in detail with reference to the drawings.
In FIG. 1, 10 is a vacuum forming apparatus of this embodiment, 12 is an upper fixing plate as a first fixing plate in the vacuum forming device 10, and 14 is a hydraulic mold clamping operated by a hydraulic device 16 of FIG. In the cylinder, a lower fixed platen 18 as a second fixed platen is integrally formed on the upper part of the mold clamping cylinder 14.

The upper fixed platen 12 and the lower fixed platen 18 are connected to each other at a constant distance by a total of four tie rods 20 shown in FIGS. 1 and 3.
Specifically, the upper fixed platen 12 and the lower fixed platen 18 are coupled to each other by two tie rods 20 at the left and right end portions in FIG. Further, in FIG. 3 showing the right side view, they are connected to each other by a pair of tie rods 20 (left and right) at an intermediate portion in the front and rear direction (left and right direction).

  These tie rods 20 have a lower end projecting downward through the lower fixed platen 18 and an upper end projecting upward through the upper fixed platen 12, and a nut 22 is tightened on the male screw of the projected portion. As a result, each tie rod 20 is fixed in a state where the upper fixed platen 12 and the lower fixed platen 18 are connected.

In FIG. 1, a movable platen 24 is disposed between the upper fixed platen 12 and the lower fixed platen 18.
The movable platen 24 moves up and down in the space between the upper fixed platen 12 and the lower fixed platen 18 under the guidance of the tie rod 20, and at its rising end, a mold 28 made of a metal mold is moved. Then, it is sandwiched between the upper fixed platen 12 and is clamped by the pressure applied by the clamping cylinder 14 and is maintained in the clamping state.
The movable plate 24 is connected to a piston rod of an elevating cylinder 26 as shown in FIG.
Here, the elevating cylinder 26 is used when the movable platen 24 is moved up and down at a high speed.

  The molding die 28 includes an upper die 28A, a middle die 28B, and a lower die 28C. The upper die 28A is held on the upper fixed platen 12 side by a support member 30, and the middle die 28B and the lower die 28C are provided. It is placed on a support plate 32 provided on the movable plate 24 and can be moved up and down integrally with the movable plate 24.

Reference numeral 34 denotes an injection machine, and 36 denotes an injection cylinder in the injection machine 34.
The injection machine 34 injects the rubber material from the injection nozzle at the tip of the injection cylinder 36 into the mold 28 in a mold-clamping state, and is molded into a predetermined shape by the mold 28.
In FIG. 3, reference numeral 38 denotes a table protruding forward, and a mold disassembling device 40 is provided on the table 38.

The mold disassembling apparatus 40 is taken out from a molding position between the upper fixed platen 12 and the lower fixed platen 18 to a mold disassembling position in front of it, and disassembles the lower mold 28C and the middle mold 28B located on the table 38. The separation part 44 is raised by raising the piston rod of the decomposition cylinder 42, thereby raising the middle die 28B upward from the lower die 28C. 28C and middle mold 28B are disassembled.
The molded rubber product (rubber molded product) can be taken out from the mold 28 by the mold decomposition.

  Note that the lower die 28C and the middle die 28B lowered together with the movable platen 24 at the molding position between the upper fixed platen 12 and the lower fixed platen 18 are cylinder-type pushers 46 (see FIG. 3) arranged at the rear of the molding position. ) To the front table 38, that is, the mold disassembly position.

In FIG. 1, reference numeral 48 denotes a peripheral wall that surrounds the entire space between the upper fixed platen 12 and the lower fixed platen 18 and forms a vacuum chamber 50 that is blocked from the outside on the inside thereof. A front wall 48A shown in FIG. 4A, a rear wall 48B shown in FIG. 4B, and a pair of left and right side walls 48C shown in FIG.
Each of the front wall 48A, the rear wall 48B, and the side wall 48C is rigidly fixed to the lower fixing plate 18 by a lower fixing bolt 52 as shown in FIG.

  Specifically, the lower fixing plate 18 is provided with a through-hole bolt hole 54, the front wall 48A, the rear wall 48B, and the side wall 48C are respectively provided with corresponding female screw holes 56, and the lower fixing bolt 52 is connected to the bolt hole 54. The front wall 48A, the rear wall 48B, and the pair of side walls 48C are fastened and fixed to the lower fixing plate 18 by inserting the male screw 58 of the lower fixing bolt 52 into the female screw hole 56. .

On the other hand, the upper end portions of the front wall 48A, the rear wall 48B, and the pair of side walls 48C are moved upward and downward by the slide fixing unit 60 as shown in FIG. It is fixed to be slidable by a predetermined minute distance in any direction.
The slide fixing unit 60 includes an upper fixing bolt 62, a pair of seat plates 64, and a disc spring 66 sandwiched between them.

  The upper fixing bolt 62 is a stepped shape having a male screw shaft portion 68 having a small diameter, a large-diameter head portion 70, and an intermediate shaft portion 72 located between them and having an intermediate diameter. The intermediate shaft portion 72 is inserted into a through bolt hole 74 provided in the front wall 48A, the rear wall 48B, and the side wall 48C, and the male screw shaft portion 68 is screwed into a female screw hole 76 provided in the upper fixing plate 12. The disc spring 66 accommodated in the recess 78 of the bolt hole 74 is elastically deformed in the compression direction in the right direction in the figure by the large-diameter head 70.

  Here, a gap is formed in the vertical direction between the bolt hole 74 and the upper fixing bolt 62, specifically, the intermediate shaft portion 72. Therefore, the front wall 48A, the rear wall 48B, and the pair of side walls 48C It can be slid relative to the fixing bolt 62, that is, relative to the upper fixed plate 12 in the vertical direction in the figure by the gap.

The front wall 48A, the rear wall 48B, and the side wall 48C hold a seal member 80 (see FIG. 2). The front wall 48A, the rear wall 48B, and the pair of side walls 48C are the outer circumferences of the upper fixed platen 12, respectively. Under the sealing state by the sealing member 80 against the end face, the end face is pressed in the direction orthogonal to the clamping direction by the elastic force of the disc spring 66.
As a result, the space between the peripheral wall 48 and the upper fixed platen 12 is airtight.

  As shown in FIG. 3, in this embodiment, a vacuum pump (exhaust means) 100 for evacuating the vacuum chamber 50 is provided, and a vacuum suction pipe 102 extending from the vacuum pump 100 is provided in the vacuum chamber 50. It is connected to the peripheral wall 48 in a communicating state.

As shown in FIG. 4, a front (front) opening 82 is provided in the front wall 48 </ b> A, and the front opening 82 is opened and closed by a front door 84.
Here, the front door 84 slides up and down by a drive unit such as an open / close cylinder (not shown).
In the closed state, the front door 84 is sealed between the front opening 82 and the peripheral edge portion by the seal member 80 shown in FIG.

As shown in FIG. 4B, the rear wall 48 B is also provided with a rear opening 86, and the rear opening 86 is opened and closed by a rear door 88.
Here, the rear door 88 rotates around the hinge 90 to open and close the rear opening 86.

As shown in FIG. 5C, a side opening 92 is also provided in the right side wall 48C, and this side opening 92 is opened and closed by a side door 94.
The side door 94 also rotates around the hinge 90 to open and close the side opening 92.

Further, as shown in FIG. 5D, a side opening 96 is also provided on the left side wall 48 C, and the side opening 96 is opened and closed by a side door 98.
The side door 98 is also rotatable by a hinge 90, and the side opening 96 is opened and closed by the rotation.
Note that the rear door 88 and the pair of side doors 94 and 98 are also in an airtight state between the peripheral edge of the opening via the seal member in the closed state.

  In this embodiment, the mold 28 is sandwiched between the movable platen 24 and the fixed platen 12 by the pressure of the clamping cylinder 14 and pressed and clamped, and the front door 84, the rear door 88, and the pair With the side doors 94 and 98 closed, the vacuum chamber 50 is evacuated by the vacuum pump 100 to bring the vacuum chamber 50 into a vacuum state, and in this state, the rubber material is put into the mold 28 from the injection cylinder 36. Injection into the cavity to mold the rubber product.

Then, after performing vulcanization over a predetermined time, the middle mold 28B and the lower mold 28C in the mold 28 are lowered together with the movable platen 24.
Thereafter, as shown in FIG. 6, the front door 84 is slid upward to open the front opening 82, and the lower mold 28 C and the middle mold 28 B are fed onto the front table 38 by the pusher 46 shown in FIG. The lower mold 28C and the middle mold 28B sent out are disassembled by the mold disassembling apparatus 40, and the vulcanized rubber product is taken out.

  In the vacuum forming apparatus 10 of the present embodiment as described above, the upper fixed platen 12 and the lower fixed platen 18 are kept connected by the tie rod 20 as a strength member, and the upper fixed platen 12 and the lower fixed platen 18 are connected. The peripheral wall 48 that encloses the space between them and forms the sealed vacuum chamber 50 inside does not need to receive a force applied to the upper fixed platen 12 and the lower fixed platen 18 at the time of mold clamping. It is not necessary to use a strength member, and it is sufficient for the peripheral wall 48 to have a space blocking function, and the cost required for the peripheral wall 48 can be reduced.

Further, since the peripheral wall 48 does not need to be formed of a strength member and receive a clamping force, the peripheral wall 48 has a front opening 82, a rear opening 86, and a pair of side openings 92 and 96. It can be easily provided.
In the present embodiment, the peripheral wall 48 forming the vacuum chamber 50 does not need to receive a force during mold clamping. Therefore, even if the peripheral wall 48 is provided with the openings 82, 86, 92, 96, the mold is thereby formed. There is no problem that the force to receive the tightening force becomes weak.

  Thus, according to the present embodiment, the side openings 92 and 96 are used as work openings, and the work for discharging the runners and the like generated by the maintenance and injection of the internal electric wiring cord can be easily performed.

  In the vacuum forming apparatus 10 of the present embodiment, a strong force generated at the time of mold clamping is received by the tie rod 20, and the upper fixing plate 12 and the lower fixing plate 18 are maintained in a state of being connected by the tie rod 20. At this time, the tie rod 20 is slightly stretched by its strong force, and it is inevitable that the upper fixed platen 12 and the lower fixed platen 18 are slightly displaced.

At this time, if the peripheral wall 48 that forms the vacuum chamber 50 inside is non-stretchable and rigidly fixed to the upper fixed platen 12 and the lower fixed platen 18, the peripheral wall 48 is damaged.
However, in this embodiment, since the peripheral wall 48 is slidable with respect to the upper fixed platen 12, even if the upper fixed platen 12 and the lower fixed platen 18 are slightly displaced under strong mold clamping force, the displacement Can be absorbed by the relative sliding movement of the peripheral wall 48 with respect to the upper fixed platen 12, and damage to the peripheral wall 48 can be prevented.

  Furthermore, in this embodiment, a through-hole bolt hole 74 is provided in the peripheral wall 48, and in the bolt hole 74, a disc spring 66 that elastically presses the peripheral wall 48 against the upper fixing plate 12 in a direction orthogonal to the mold clamping direction. The upper fixing bolt 62 is fixed to the upper fixing platen 12, and a gap is formed between the bolt hole 74 and the upper fixing bolt 62, and the peripheral wall 48 is raised at the time of mold clamping based on the gap. Since it is slidable with respect to the fixed platen 12, the peripheral wall 48 can be slidably attached to the upper fixed platen 12 with a simple assembly structure.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, in the above-described embodiment, the peripheral wall 48 is slidable with respect to the upper fixed platen 12, but depending on circumstances, this may be performed with respect to either the lower fixed platen 18 or the upper fixed platen 12 and the lower fixed platen 18. However, the peripheral wall 48 itself can be made to have a telescopic function, and by the telescopic function, a minute displacement between the upper fixed platen 12 and the lower fixed platen 18 at the time of mold clamping is achieved. It is also possible to absorb it.

Furthermore, although the said embodiment is an example of a vertical vacuum forming apparatus, this invention is applied to a horizontal type vacuum forming apparatus, and it is between the 1st stationary platen and the 2nd stationary plate which are spaced apart in the left-right direction. It is also possible to surround the space with a peripheral wall and form a vacuum chamber inside.
In addition, the present invention can be applied to a resin product molding apparatus, and the present invention can be configured in various modifications without departing from the spirit of the present invention.

10 Vacuum forming equipment 12 Upper fixed platen (first fixed platen)
18 Lower fixed platen (second fixed platen)
20 Tie rod 24 Movable plate 28 Mold 34 Injection machine 48 Peripheral wall 50 Vacuum chamber 62 Upper fixing bolt 66 Belleville spring 80 Seal member 100 Vacuum pump (exhaust means)

Claims (3)

  (A) (a) a first fixed platen, (b) a second fixed platen located at a distance from the first fixed platen, and (c) a space between the first fixed platen and the second fixed platen. (D) a tie rod as a strength member connecting the first fixed plate and the second fixed plate; (e) A mold clamping device having pressurizing means for pressurizing and clamping the movable plate so that the mold is sandwiched between the movable plate and the first fixed plate; and (B) (f) the first fixed plate; Surrounding the entire space between the second fixed platen and blocking from the outside, and a peripheral wall having the space as a vacuum chamber, and (g) a state in which the movable platen and the mold are positioned inside the vacuum chamber And an evacuating device having an evacuating means for evacuating the inside of the vacuum chamber, and injecting a molding material from the injection machine into the molding die in the vacuum chamber. Vacuum forming apparatus characterized by are none to form.   2. The peripheral wall according to claim 1, wherein the peripheral wall is slidable with respect to the first fixed plate and / or the second fixed plate in a direction opposite to the mold clamping direction under a sealing state by a seal member. A vacuum forming apparatus characterized in that it can be expanded and contracted in the opposite direction.   3. The peripheral wall according to claim 2, wherein the peripheral wall has a penetrating bolt hole, and in the bolt hole, the peripheral wall is elastically pressed against the first fixing plate and / or the second fixing plate in a direction orthogonal to the mold clamping direction. The bolt hole is fixed to the first fixing plate and / or the second fixing plate by a fixing bolt via a spring, and the bolt hole forms a gap in the direction opposite to the mold clamping direction with the fixing bolt. A vacuum forming apparatus characterized in that the peripheral wall is slidable relative to the first fixed plate and / or the second fixed plate during mold clamping based on the gap.

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