JP2013039727A - Molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a vacuum suction chamber 2 in a molding apparatus to form the rubber product and the synthetic resin product in a vacuum state.SOLUTION: A chamber 2 comprises: a first chamber wall body 22 that is provided on a fixed base plate 21 that holds a fixed mold unit 31; a second chamber wall body 24 that is provided on a movable base plate 23 that can support a movable mold unit 32 and can be combined air tightly with the first chamber wall body 22; and a third chamber wall body 25 that can press the movable base plate 23 to the joining direction of the first and the second chamber wall bodies 22 and 24. In a state that the first and the second chamber wall bodies 22 and 24 are mutually separated up and down and the movable mold unit 32 is supported by the movable base plate 23, a gap Gbetween the fixed mold and the movable mold units 31 and 32 is larger than the gap Gbetween the first and the second chamber wall bodies 22 and 24, and a pressure head 4 can press the movable mold unit 32 against the fixed mold unit 31.

Description

  The present invention relates to a molding apparatus for molding a rubber product or a synthetic resin product with a mold in a vacuum chamber.

  When rubber products such as oil seals are molded by compression molding, etc., the mold cavity is evacuated to -93.3kPa (-700mmHg) or less, and bubbles are formed in the molded product due to residual air in the cavity. A high-quality molded product can be obtained. Therefore, conventionally, in order to perform such molding, as shown in FIGS. 8 to 11, it is known that a mold is surrounded by a chamber and the inside of the chamber is evacuated.

  Among these, in the first example of the prior art illustrated in FIG. 8, the chamber 100 evacuated by the vacuum pump 200 opens to the chamber main body 101 and one side thereof, and the mold unit 300 is taken in and out in the horizontal direction. It consists of the plate-shaped door 102 which slides up and down the gate 101a (for example, refer patent document 1).

  In the second example of the prior art illustrated in FIG. 9, the chamber 100 that is evacuated by the vacuum pump 200 includes the first chamber wall 103 on the fixed mold 301 side and the lower mold 302 side in the mold unit 300. The first chamber wall body 103 and the second chamber wall body 104 are sealed by fitting in a nested manner (see, for example, Patent Document 2).

  In the third example of the prior art illustrated in FIG. 10, the chamber 100 that is evacuated by the vacuum pump 200 includes a cover 105 that is provided on the casting head 303 so as to be relatively movable in the vertical direction. Is sealed by bringing the lower end of the cover 105 into intimate contact with the outer peripheral portion of the upper surface of the moving plate 304 that moves up and down the casting head 303.

  Furthermore, in the fourth example of the prior art illustrated in FIG. 11, the chamber 100 evacuated by the vacuum pump 200 includes a fixed wall body 106 fixed to the lower surface of the fixed plate 305, and a vertical surface on the lower surface of the fixed plate 305. The movable wall 107 includes a movable wall 107 that is movably disposed and is fitted in the fixed wall 106 in a nesting manner. It is designed to be sealed by close contact.

Utility Model Registration No. 3082200 Japanese Patent Laid-Open No. 10-86192

  However, in the first example of the prior art shown in FIG. 8, in addition to the large volume of the chamber 100, it is necessary to open and close the door 102 with a stroke that is greater than the opening height required for taking in and out the mold unit 300. Therefore, there is a problem that the time for opening and closing the door 102 becomes long. Moreover, since a packing (not shown) provided around the gate 101a slides in a non-lubricated state as the door 102 is opened and closed, the packing is quickly consumed, and when the packing is consumed, the vacuum pump 200 draws a vacuum. However, there is a problem that it is difficult to obtain a sufficient degree of vacuum of −93.3 kPa or less, and as a result, molding defects are likely to occur.

  Further, the second example of the prior art shown in FIG. 9 has a simple structure with a small number of parts, and the first chamber wall 103 and the second chamber wall on the fixed mold 301 and the lower mold 302 in the mold unit 300. Since the body 104 can be provided in the vicinity, the volume of the chamber 100 can be reduced to shorten the time required to reach a sufficient degree of vacuum, but the thickness of the fixed mold 301 and the lower mold 302 can be reduced. In addition, since it is necessary to increase the height of the first chamber wall 103 and the second chamber wall 104, it may interfere with the injection of the molding material into the mold unit 300 and the removal of the product, or combined with the mold parts. Because of the structure, the positioning accuracy of the first chamber wall body 103 and the second chamber wall body 104 needs to be high. In particular, when the mold size is increased, the position in the rotation direction is increased. Is high out precision requirements, there is a problem requiring a great deal of time and effort to assemble and adjust.

  Further, in the third and fourth examples of the prior art shown in FIG. 10 or FIG. 11, the chamber 100 is flexible for changing the height of the mold unit 300, and the molding material for the mold unit 300 is used. However, the chamber 100 needs to be moved up and down with a stroke higher than the opening height necessary for the insertion and removal of the mold unit 300, so that the time required for opening and closing the chamber 100 is reduced. There is a problem that becomes longer. Since the mold unit 300 is cooled as the opening / closing operation time of the chamber 100 is longer, heating takes time, and molding by vulcanization at high temperature and short time is difficult.

  Moreover, the packing 105a in FIG. 10 or the packing 107a in FIG. 11 always slides when the chamber 100 is opened and closed, and thus is easily consumed. Particularly, when the chamber 100 is box-shaped, the R shape (curvature radius) of the four corners. ), It is necessary to use an O-ring that can handle a small radius of curvature as the packing 107a. However, twisting and uneven wear are likely to occur due to load concentration on the corners, leading to early failure. There is a fear. In addition, since the structure is complicated, there is a problem that it is difficult to replace the packing (O-ring) 107a.

  The present invention has been made in view of the above points, and the technical problem thereof is that of a chamber that is evacuated by a vacuum pump in a molding apparatus that molds a rubber product or a synthetic resin product in a vacuum state. Provides a molding device that can improve the workability of maintenance, etc. by simplifying the structure, and does not hinder the injection of molding material into the mold unit or take out the product, and can reduce the opening and closing stroke of the chamber There is to do.

  As a means for effectively solving the technical problem described above, a molding apparatus according to claim 1 includes a chamber capable of being evacuated, and a fixed mold unit and a movable mold unit disposed in the chamber. A fixed base plate for holding the fixed mold unit, and a fixed base plate for holding the fixed mold unit, and a pressurizing head for abutting and pressurizing the fixed mold unit and the movable mold unit. And a movable base plate arranged to surround the outer periphery of the fixed mold unit and to be movable relative to the fixed base plate so as to support the movable mold unit. And a second chamber wall provided on the movable base plate so as to surround an outer periphery of the movable mold unit and capable of airtightly engaging with the first chamber wall, and the movable base The first chamber wall and the second chamber wall are vertically separated from each other, and the movable mold unit is attached to the movable base plate. In the supported state, the gap between the fixed mold unit and the movable mold unit is larger than the gap between the first chamber wall body and the second chamber wall body, and the pressurizing head is connected to the movable mold unit. The mold unit can be pressed away from the movable base plate and pressed against the fixed mold unit.

  In the above configuration, in a state where the fixed mold unit and the movable mold unit of the mold unit and the first chamber wall body, the second chamber wall body, and the third chamber wall body of the chamber are separated from each other in the mold opening / closing direction. The gap between the fixed mold unit and the movable mold unit is larger than the gap between the first chamber wall and the second chamber wall.

  From this state, when the third chamber wall is advanced toward the movable base plate, the third chamber wall collides with the surface of the movable base plate opposite to the second chamber wall. The lever base plate is pushed, so that the second chamber wall body and the movable mold unit advance toward the fixed base plate side together with the third chamber wall body and the movable base plate. And when the second chamber wall is airtightly contacted with the opposite end of the first chamber wall, the chamber is sealed, and at this point, there is a gap between the fixed mold unit and the movable mold unit, Therefore, the mold cavity can be set to a high degree of vacuum by evacuating the chamber. Next, the movable mold unit supported by the movable base plate is separated from the movable base plate by driving the pressure head and airtightly contacted with the fixed mold unit, so that the mold unit is in a mold clamping state. Can be migrated to.

  A molding apparatus according to a second aspect of the present invention is the molding apparatus according to the first aspect, wherein the outer peripheral surface of the pressure head has a substantially cylindrical shape, and the inner peripheral end portion of the third chamber wall is formed by the pressure head. It has a substantially circular shape that is slidably in contact with the outer peripheral surface via a packing.

  According to a third aspect of the present invention, in the molding apparatus according to the first or second aspect, the height of the first chamber wall is higher than the height of the fixed mold unit, and the height of the second chamber wall is movable. It is characterized by being below the height of the mold unit.

  According to the molding apparatus according to the present invention, the chamber can be closed with a stroke smaller than the mold clamping stroke of the mold unit, and therefore the opening and closing time of the chamber can be shortened to improve workability. As a result, the cooling of the mold can be suppressed and the molding yield can be improved.

  Further, the packing provided at the inner peripheral end of the third chamber wall and slidably in contact with the outer peripheral surface of the pressure head can be formed into a substantially annular shape having no corners, so that it can be used. A wide range of packing options is available, which prevents the twisting or uneven wear of the packing due to the load concentration on the corners caused by sliding, and contributes to maintaining a high vacuum in the chamber.

  In addition, by setting the height of the second chamber wall to be equal to or lower than the height of the movable mold unit, the second chamber wall does not hinder the injection of the molding material into the movable mold unit or the removal of the product. Can be improved.

It is a schematic structure explanatory view showing a preferred embodiment of a molding device according to the present invention. It is explanatory drawing of the mold insertion / extraction operation | movement which shows preferable embodiment of the shaping | molding apparatus which concerns on this invention. It is explanatory drawing of the mold open state which shows preferable embodiment of the shaping | molding apparatus which concerns on this invention. In preferred embodiment of the shaping | molding apparatus which concerns on this invention, it is explanatory drawing which shows the state which the chamber and the mold unit opened. It is explanatory drawing which shows the state which sealed the chamber in preferable embodiment of the shaping | molding apparatus which concerns on this invention. It is explanatory drawing which shows the state which evacuated the inside of the sealed chamber in preferable embodiment of the shaping | molding apparatus which concerns on this invention. It is explanatory drawing which shows the state which clamped the die unit in a chamber in preferable embodiment of the shaping | molding apparatus which concerns on this invention. It is the front view and side view which show the 1st example of the shaping | molding apparatus which concerns on a prior art. It is explanatory drawing which shows the 2nd example of the shaping | molding apparatus which concerns on a prior art in the open state and closed state of a chamber. It is schematic structure explanatory drawing which shows the 3rd example of the shaping | molding apparatus which concerns on a prior art. It is schematic structure explanatory drawing which shows the 4th example of the shaping | molding apparatus which concerns on a prior art.

  Hereinafter, a preferred embodiment of a molding apparatus according to the present invention will be described in detail with reference to FIGS.

  First, in FIG. 1, reference numeral 1 is a fixed plate at the upper part of the molding apparatus, reference numeral 2 is a chamber, reference numeral 3 is an upper fixed mold unit 31 and a lower movable mold unit 32 disposed in the chamber 2. A reference numeral 4 is a pressure head which is located under the molding apparatus and clamps the mold unit 3.

  The chamber 2 includes a fixed base plate 21 having a fixed mold unit 31 attached to the lower surface, and a first attached to the lower surface of the fixed base plate 21 so as to surround the outer periphery of the fixed mold unit 31 in the mold unit 3. The outer periphery of the movable mold unit 32 in the mold unit 3 is surrounded by the chamber wall 22, the movable base plate 23 which is disposed below the fixed base plate 21 and can be moved back and forth in the vertical direction. The second chamber wall 24 that is attached in this manner and is opposed to the lower end surface of the first chamber wall 22, and is disposed below the movable base plate 23, and is advanced and retracted in the vertical direction by the pressure head 4 and the actuator 26. It consists of a third chamber wall 25.

  Then, the inside of the chamber 2 sealed by the first chamber wall body 22 and the second chamber wall body 24 and the movable base plate 23 and the third chamber wall body 25 being in airtight contact with each other is evacuated by the vacuum pump 5. Can be done.

  A packing 24a is held at the upper end of the second chamber wall 24 facing the lower end surface of the first chamber wall 22, and the space between the second chamber wall 24 and the movable base plate 23 is sealed with a packing 24b. ing.

  The pressure head 4 is moved up and down by a drive device (not shown), and includes a base portion 41, an intermediate portion 42 rising from the base portion 41, and a support plate portion 43 formed at the upper end of the intermediate portion 42. Have. The third chamber wall 25 rises from the bottom wall portion 25 a whose inner peripheral edge is loosely fitted to the outer peripheral surface of the intermediate portion 42 of the pressure head 4 and the outer peripheral end portion thereof, and the outer periphery of the intermediate portion 42 and the support plate portion 43. A side wall 25b extending so as to surround the side, a packing 25c held at the upper end of the side wall 25b so as to be in close contact with the lower surface of the movable base plate 23, and an inner diameter portion of the bottom wall 25a through a screw 25e and a packing 25f. And an annular holder 25d coupled to each other, and a packing 25g which is held on the inner diameter portion of the holder 25d and slidably comes into contact with the outer peripheral surface of the intermediate portion 42.

  The actuator 26 is composed of, for example, a hydraulic cylinder device. The actuator 26 is attached to the base portion 41 of the pressure head 4, and the upper end of the rod 26 a that outputs the thrust in the vertical direction is connected to the bottom wall portion 25 a of the third chamber wall body 25. Are combined. Therefore, the third chamber wall 25 is advanced and retracted in the vertical direction by driving the pressure head 4 and the actuator 26.

  The planar projection shape of the mold unit 3 is substantially rectangular, and the first chamber wall 22, the second chamber wall 24, and the side wall portion 25 b of the third chamber wall 25 constituting the chamber 2 surrounding the mold unit 3 are also included. Whereas the planar projection shape is substantially rectangular, the outer peripheral surface of the intermediate portion 42 of the pressure head 4 is formed in a cylindrical surface shape, and is therefore slidably in close contact with the outer peripheral surface of the intermediate portion 42. The holder 25d that holds the packing 25g has a circular opening shape on the inner periphery.

  The fixed base plate 21 is supported slightly below the lower surface of the stationary platen 1 at the upper part of the molding apparatus by the mold taking in / out apparatus 6 shown in FIG. 31 includes a heat plate 312 attached to the lower surface of the fixed base plate 21 via a heat insulating plate 311 and incorporating a heater (not shown), and an upper mold 313 attached to the lower surface of the heat plate 312.

  The movable base plate 23 has a frame shape (frame shape) with an open inner periphery, and is a gold plate at a position slightly above the upper end position of the side wall portion 25b of the third chamber wall body 25 waiting at the stroke lower limit position. The movable mold unit 32 in the mold unit 3 is arranged on the inner periphery of the movable base plate 23 and the outer peripheral flange 320a is movable base. A supported plate 320 that can be supported on the inner peripheral flange 23a of the plate 23, a hot plate 322 that is attached to the upper surface of the plate 23 via a heat insulating plate 321 and that has a heater (not shown), and an upper surface of the hot plate 322 The lower mold 323 is attached to the lower mold 323. Further, the supported plate 320 of the movable mold unit 32 and the support plate portion 43 of the pressure head 4 can be slightly displaced up and down by a fitting structure (not shown) that is engaged when the mold is put in and out. Are connected to each other.

The second chamber wall 24 is separated downward from the first chamber wall 22 integrated with the fixed base plate 21 supported by the mold taking-in / out apparatus 6 shown in FIG. 2, and the movable base plate 23 supported by the cam follower. In the state of FIG. 1 in which the supported plate 320 of the movable mold unit 32 is supported on the fixed mold unit 31 and the movable mold more than the gap G ₁ between the first chamber wall body 22 and the second chamber wall body 24. better during mold unit 32 of the gap G ₂ of (between the upper mold 313 and lower mold 323) has become larger. That is, the upper surface of the movable base plate 23 and the supported plate 320 supported by the movable base plate 23 are on the same plane, and the thickness t ₁ of the fixed mold unit 31 and the heat insulating plate 321 to the lower mold 323 in the movable mold unit 32 The sum (t ₁ + t ₂ ) of the thickness t _{2 of} the first chamber wall 22 is smaller than the sum (h ₁ + h ₂ ) of the height h _{1 of} the first chamber wall 22 and h ₂ of the second chamber wall 24. Due to such a dimensional relationship, G ₁ <G ₂ is satisfied.

The height h ₁ of the first chamber wall 22 is higher than the thickness t ₁ of the stationary mold unit 31, the height h ₂ of the second chamber wall 24, the heat insulating plate 321 in the movable mold unit 32 It is equal to or lower than the thickness t ₂ up to the lower mold 323.

  The pressurizing head 4 has a support plate portion 43 at an upper portion thereof directly below the supported plate 320 in the movable mold unit 32, and can pass vertically through the inner peripheral opening of the movable base plate 23. Then, the support plate part 43 lifts the movable mold unit 32 from below so as to be separated (floated) from the movable base plate 23, and the lower mold 323 in the movable mold unit 32 is moved upward from the fixed mold unit 31. The movable mold unit 32 and the fixed mold unit 31 and the fixed mold unit 31 are lifted together with the fixed base plate 21 and pressed against the fixed platen 1 at the upper part of the molding apparatus in a state of being brought into contact with the mold 313. Clamping is performed by pressurizing the unit 31.

  Between the abutting surfaces of the upper mold 313 of the fixed mold unit 31 and the lower mold 323 of the movable mold unit 32, which are abutted and pressed against each other by the pressure head 4, a rubber product such as an oil seal is provided. A plurality of cavities 33 for compression molding are formed facing each other.

  As shown in FIG. 2, the fixed base plate 21 is provided with a rack 61 that is horizontally moved by a pinion 62, and the movable base plate 23 is provided with a rack 63 that is horizontally moved by a pinion 64. The pinion 62 and the rack 61, and the pinion 64 and the rack 63 constitute the mold taking-in / out device 6. Therefore, the fixed base plate 21, the fixed mold unit 31 and the first chamber wall body 22, the movable base plate 23, the movable mold unit 32 and the second chamber wall body 24 are connected to the fixed platen 1 and the pressure head 4. The space between the support platen 43 and the external space adjacent to the outside thereof can be taken in and out in the horizontal direction.

  Further, in the state where it is pulled out from between the stationary platen 1 and the support platen portion 43 of the pressure head 4 by the mold taking-in / out device 6, as shown in FIG. The mold unit 31 and the first chamber wall 22 can be rotated around the horizontal axis of the pinion 62 by a mold opening / closing device (not shown). For this reason, the movable base plate 23 and the movable mold supported by the movable base plate 23 are supported. The mold unit 32 and the second chamber wall 24 held integrally can be opened and closed.

  The molding apparatus according to the illustrated embodiment configured as described above performs a molding operation in the following steps.

First, as shown in FIG. 2, the mold unit 3 is pulled out of the molding apparatus. Specifically, the fixed base plate 21, the fixed mold unit 31 attached thereto, the first chamber wall body 22, and the movable base plate 23 are drawn. Then, the movable mold unit 32 supported by this and the second chamber wall 24 held integrally therewith are pulled out of the molding apparatus by the mold taking in / out device 6, and as shown in FIG. Then, the fixed mold unit 31 and the first chamber wall body 22 held integrally therewith are opened, and an unvulcanized rubber fabric A for molding is formed on the lower mold 323 in the movable mold unit 32 and integrally molded as necessary. Insert metal parts to be used. At this time, the height of the second chamber wall 24 is equal to or lower than the height of the movable mold unit 32 (thickness t ₂ shown in FIG. 1). The operation can be performed smoothly without hindering the introduction of the unvulcanized rubber fabric A onto the movable mold unit 32.

  After the unvulcanized rubber fabric A is charged, the fixed base plate 21 and the fixed mold unit 31 and the first chamber wall 22 held integrally with the base plate 21 are closed as shown in FIG. Then, the unvulcanized rubber fabric A is not shown), and is inserted again between the stationary platen 1 and the support plate 43 of the pressure head 4 in the molding device by the mold take-out device 6 as shown in FIG.

At this time, the upper surface of the fixed base plate 21 supported by the mold inserting / removing device 6 (not shown in FIG. 4) is not in contact with the lower surface of the stationary platen 1 of the molding apparatus, and the fixed mold unit 31 and the movable mold The units 32 are separated from each other in the vertical direction (mold opening / closing direction), the second chamber wall 24 is separated downward from the first chamber wall 22, and the movable base plate 23 supported by a cam follower (not shown). The outer peripheral flange 320a of the supported plate 320 in the movable mold unit 32 is supported by the inner peripheral flange 23a, and the pressure head 4 is in a predetermined lowered position where it is not in contact with the supported plate 320. The third chamber wall 25 is waiting and is in a standby state at the stroke lower limit position separated from the lower surface of the movable base plate 23 by the actuator 26. In this state, as shown in FIG. 1, the fixed die unit 31 and the movable mold unit 32 (upper die 313 and lower die 323) are opposed with a gap G _2, the gap G ₂ is, first The gap G ₁ between the chamber wall body 22 and the second chamber wall body 24 is larger.

  Next, when the third chamber wall 25 is raised by driving the actuator 26, the upper end of the side wall portion 25b eventually comes into close contact with the lower surface of the movable base plate 23 via the packing 25c, and the movable base plate 23 is moved. Push up. Therefore, the second chamber wall 24 provided on the movable base plate 23 and the movable mold unit 32 supported on the inner periphery of the movable base plate 23 are also raised. Note that the pressure head 4 also rises as the movable base plate rises.

As shown in FIG. 5, the upper end of the second chamber wall 24 pushed up through the movable base plate 23 by the upward movement of the third chamber wall 25 eventually becomes the lower end of the first chamber wall 22 through the packing 24a. As a result, the chamber 2 is hermetically sealed, and at that time, the upward movement of the actuator 26 and the pressure head 4 is stopped. The gap G ₃ is formed between the stationary mold unit 31 and the movable mold unit 32 (upper die 313 and lower die 323) in this state. The gap G ₃ are a size corresponding to G ₂ -G _1, the upper end of the unvulcanized rubber material A in the cavity has a clearance which does not contact the cavity surface of the movable mold.

  That is, the stroke of the third chamber wall 25 for closing the chamber 2 by the actuator 26 and the pressure head 4 is necessary for clamping the fixed mold unit 31 and the movable mold unit 32 of the mold unit 3. Since the operation time is shortened and the workability is improved, cooling of the mold unit 3 can be suppressed and the molding yield can be improved.

  Next, by driving the vacuum pump 5, the inside of the chamber 2 is evacuated as shown by the hatching in FIG. There is an air-permeable gap between the inner peripheral flange portion 23a of the movable base plate 23 and the outer peripheral flange portion 320a of the supported disc 320 supported by the movable base plate 23. 23 above the space (inner circumferential space of the first chamber wall body 22 and the second chamber wall body 24) and the space below the movable base plate 23 (between the third chamber wall body 25 and the pressure head 4). The space 2 is in communication, and the chamber 2 is evacuated smoothly.

At this time, as described above, the gap between the upper mold 313 of the fixed mold unit 31 and the lower mold 323 of the movable mold unit 32 where the upper end of the unvulcanized rubber fabric A does not contact the cavity surface of the movable mold. Since G ₃ is formed, the cavity 33 formed in the upper mold 313 and the lower mold 323 and facing each other is also evacuated to the same degree of vacuum as in the chamber 2.

  The chamber 2 surrounds the outer periphery of the mold unit 3 as well as the upper outer periphery of the pressure head 4. However, since the volume of the chamber 2 does not need to be so large, for example, −93.3 kPa ( A predetermined degree of vacuum of −700 mmHg) or less can be reached in a short time.

  When the atmospheric pressure in the chamber 2 detected by a pressure sensor (not shown) reaches a predetermined degree of vacuum, as shown in FIG. 7, the vacuum pump 5 is stopped and the degree of vacuum in the chamber 2 is reduced by the valve 7 or the like. The pressure head 4 is raised while maintaining the above. At this time, the cylinder 26b of the actuator 26 attached to the base 41 of the pressurizing head 4 also rises together with the pressurizing head 4, but by controlling a counter balance valve (not shown) provided in the circuit of the actuator 26, the actuator 26 The rod 26a is immersed in the cylinder 26b as it rises.

  Then, by raising the pressure head 4 in this manner, the support plate portion 43 at the upper end pushes up the lower surface of the supported plate 320 in the movable mold unit 32, so that the inner surface of the movable base plate 23 is reached so far. The supported movable mold unit 32 is separated (floated) from the movable base plate 23, and the lower mold 323 in the movable mold unit 32 collides with the upper mold 313 in the fixed mold unit 31. Tightening is done.

  In this mold clamping process, the unvulcanized rubber fabric A is compressed in the cavity 33 formed between the lower mold 323 and the upper mold 313 heated by the heat from the heating plates 312 and 322, and with time. It is molded by vulcanization and curing, and becomes a product B such as an oil seal. At this time, since the inside of the cavity 33 is in a high vacuum, the residual air is not sealed in the rubber fabric A (product B), and a high-quality product B is molded.

  After molding, the inside of the chamber 2 is opened to the atmosphere, and the actuator 26 is lowered from the state shown in FIG. 7 to lower the first chamber wall body 22 and the second chamber wall body 24, and the movable base plate 23 and the third chamber wall body. The pressure head 4 is lowered by separating 25 and lowering a main ram (not shown). At this time, the fixed base plate 21 and the first chamber wall 22 are lowered until the rack 61 comes into contact with the pinion 62, and the movable base plate 23 and the supported board 320 are lowered until the rack 63 comes into contact with the pinion 64 (rack). 61 and 63, and pinions 62 and 64, see FIG. Here, the fixed mold unit 31 and the movable mold unit 32 are separated from each other. The support platen 43 stops descending at a position where a slight gap is formed from the supported plate 320 (the state shown in FIG. 4). Next, as shown in FIG. 2, it is pulled out of the molding apparatus by the mold taking-in / out apparatus 6, and as shown in FIG. 3, the fixed base plate 21, the fixed mold unit 31 and the first chamber held integrally therewith. The wall body 22 is opened, and the product B is taken out from the lower mold 323 in the movable mold unit 32 (the product B is not shown in FIGS. 2, 3, and 4).

  Since the height of the second chamber wall 24 is equal to or lower than the height of the movable mold unit 32, the second chamber wall 24 allows the product B to be taken out of the movable mold unit 32. There is no hindrance and the workability can be improved here.

  In the above-described series of operations, for example, in the closing process of the chamber 2 shown in FIG. 5 from the state shown in FIG. 4 and the mold clamping process shown in FIG. 7 from the state shown in FIG. Since the head 4 is relatively displaced, the packing 25g slides on the outer peripheral surface of the intermediate portion 42 of the pressure head 4. The outer peripheral surface of the intermediate portion 42 forms a cylindrical surface, and the holder 25d allows the packing to be performed. Since 25 g has an annular shape, load concentration does not occur in a part in the circumferential direction of the packing 25 g unlike when sliding on the rectangular tube surface, and torsion and uneven wear can be effectively prevented. it can. As a result, the types of packings 25g that can be used are expanded, and the quality of the molded product can be improved by making the inside of the chamber 2 have a sufficient degree of vacuum.

  Further, according to the molding apparatus configured as described above, the third chamber wall body 25 is in airtight contact with the movable base plate 23, and the second chamber wall body 24 is connected to the first chamber wall body 22 via the movable base plate 23. Since the chamber 2 is defined by airtightly colliding with each other, the structure is simple and workability during maintenance such as replacement of the packings 24a, 25c, and 25g can be improved.

  For example, when replacing the packing 25g, the mold unit 3 is first removed from the apparatus, then the fixed base plate 21 and the first chamber wall 22 integrated with the fixed base plate 21 are removed from the apparatus, and are coupled with bolts (not shown). When the actuator 26 is lifted after separating the intermediate portion 42 and the support plate portion 43 of the pressure head 4 that is present, the supported plate 320 and the support plate portion 43 are slightly moved up and down by a fitting structure (not shown). Since they are connected to each other in a displaceable state, the second chamber wall 24, the third chamber wall 25, the supported plate 320 and the support plate 43 are raised, and the support plate 43 is separated from the intermediate portion 42. The Accordingly, when the actuator 26 is further raised, the packing 25g is detached from the intermediate portion 42, so that the packing 25g can be removed from the holder 25d and replaced. After the replacement, it can be assembled by the reverse operation of the above.

In the state shown in FIG. 1, the relationship G ₁ <G ₂ , that is, t ₁ + t ₂ <h ₁ + h ₂ , and in the closed state of the chamber 2 shown in FIG. 5, the gap G ₃ is unvulcanized rubber fabric. If the condition that the thickness is larger than A is satisfied, the lower mold 323 in the movable mold unit 32 and the upper mold 313 in the fixed mold unit 31 can be changed to ones having different thicknesses.

1 fixed plate 2 chamber 21 fixed base plate 22 first chamber wall 23 movable base plate 24 second chamber wall 24a, 24b, 25c, 25f, 25g packing 25 third chamber wall 26 actuator 3 mold unit 31 fixed mold Mold unit 313 Upper mold 32 Movable mold unit 320 Supported board 323 Lower mold 33 Cavity 4 Pressure head 5 Vacuum pump

Claims (3)

  A vacuumable chamber, a mold unit composed of a fixed mold unit and a movable mold unit disposed in the chamber, and pressurization for pressing and pressing the fixed mold unit and the movable mold unit with each other A fixed base plate for holding the fixed mold unit; a first chamber wall provided on the fixed base plate so as to surround an outer periphery of the fixed mold unit; and the movable mold. A movable base plate that is capable of supporting a mold unit and can be moved back and forth with respect to the fixed base plate, and is provided on the movable base plate so as to surround an outer periphery of the movable mold unit. A second chamber wall body capable of airtight engagement with a body, and a third chamber wall body capable of pushing the movable base plate toward the first chamber wall body side. In a state where the second chamber wall is separated from each other and the movable mold unit is supported by the movable base plate, the fixed mold is more than the gap between the first chamber wall and the second chamber wall. A molding characterized in that a gap between the mold unit and the movable mold unit is large, and the pressure head can press the movable mold unit against the fixed mold unit by separating the movable mold unit from the movable base plate. apparatus.   The outer peripheral surface of the pressure head has a substantially cylindrical shape, and the inner peripheral end of the third chamber wall has a substantially circular shape that is slidably in contact with the outer peripheral surface of the pressure head via a packing. The molding apparatus according to claim 1, characterized in that:   The height of the first chamber wall is higher than the height of the fixed mold unit, and the height of the second chamber wall is equal to or lower than the height of the movable mold unit. Molding equipment.

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