JP2005186152A - Vacuum molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive vacuum molding machine wherein a secure airtight state can be obtained with a simple constitution, and whole of the device can be miniaturized. <P>SOLUTION: In the vacuum molding machine, a vacuum chamber 15 storing a die 44 comprises each face of the device body 12 is made into a sealed state to form a vacuum chamber 15, and a shutter 22 which is located at the front face of the vacuum chamber 15 and can be freely opened and closed is provided. The peripheral part on the back side of the shutter 22 is provided with an O ring 26 surrounding the opening part 13 at the front face of the vacuum chamber 15 in an airtight state and an energizing apparatus 24 bringing the O ring 26 of the shutter 22 into contact with the front face of the vacuum chamber 15. The O ring 26 abuts against the peripheral part of the vacuum chamber 15 without being brought into slidable contact therewith, seals the inside of the vacuum chamber 15 and is tightly stuck with the peripheral part of the opening part 13 in an airtight state by the force of atmospheric pressure owing to the conversion of the vacuum chamber 15 into a vacuum state. The inside is provided with a hydraulic cylinder apparatus 50, and both the sides of the main cylinder 53 of the hydraulic cylinder apparatus 50 are provided with auxiliary cylinders 54 and 55 and auxiliary pistons 56 and 57 for elevating/lowering the die 44. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vacuum molding machine that molds rubber, plastic, and the like in a vacuum state using a mold.

  In a conventional vacuum molding machine, a vacuum chamber is provided inside the main body of the molding machine, and a rubber packing is provided on the side wall of the chamber where the inside is evacuated. The operation of this molding machine is to open the chamber, place the mold on the mold receiving plate, create a vacuum, and then press the mold from above and below by a hydraulic device (not shown) to mold the rubber inside. .

  In this vacuum forming machine, 2 to 4 individual molding machines are usually arranged side by side, one hydraulic pump unit is installed on the side or rear side, and each vacuum forming machine is connected by on-site piping. . In addition, a timer, a temperature controller, and the like are disposed on the front surface of the vacuum forming machine.

  In addition, as disclosed in Patent Document 1 by the inventor of the present application, each surface and ridgeline of the hexahedron device main body are hermetically sealed, the inside is hermetically sealed, and the front surface is openable and closed. There has also been proposed a vacuum forming machine provided with a shutter that can be airtight.

In the case of the above-described conventional technology, a rubber packing or an O-ring is used at the contact portion between the chamber or shutter to be sealed and the peripheral edge of the opening on the main body side. The rubber packing and the O-ring are pressed and are crushed so that the rubber packing and the O-ring are brought into close contact with the object to be contacted to maintain airtightness.
JP 11-239899 A

  However, when the chamber and the shutter are opened and closed, the contact target surface and the rubber packing and the O-ring rub against each other, and the contact surface is worn, and the airtightness is impaired by use. In addition, in order to obtain reliable airtightness, the rubber packing and the O-ring must be further deformed, and the rubber packing and the O-ring are consumed quickly. In addition, in order to obtain airtightness, devices such as a fluid cylinder for operating a chamber and a shutter have been increased in size, and the vacuum molding machine itself has become large.

  In addition, the hydraulic cylinder in the vacuum molding machine has been increased in size to obtain a large molding capability, the hydraulic pump has been increased in size, and the entire apparatus has become large.

  The present invention has been made in view of the above-mentioned problems of the prior art. A vacuum molding machine that can obtain a reliable airtight state with a simple configuration, can reduce the size of the entire apparatus, and is inexpensive. The purpose is to provide.

  The present invention has a vacuum chamber that accommodates a mold and is evacuated, covers each surface of the apparatus body in a sealed state, forms the vacuum chamber inside, and is positioned in front of the vacuum chamber. A vacuum molding machine provided with a shutter that can be opened and closed and can be closed to be airtight, and has a hydraulic cylinder inside, and an auxiliary for raising and lowering the mold on both sides of the ram of the hydraulic cylinder. A vacuum forming machine provided with a cylinder part and an auxiliary piston.

  An O-ring that surrounds the opening on the front surface of the vacuum chamber in an airtight state and an urging device that brings the O-ring of the shutter into contact with the front surface of the vacuum chamber are provided at a peripheral portion on the rear surface side of the shutter. The vacuum chamber is brought into contact with the peripheral edge of the vacuum chamber without sliding contact, and the vacuum chamber is hermetically sealed, and the vacuum chamber is brought into a vacuum state so that the vacuum chamber is brought into close contact with the peripheral portion of the opening by a force of atmospheric pressure. is there. Further, in the vicinity of the O-ring of the shutter, the O-ring protrudes to a position protruding from the O-ring surface so that the O-ring does not slidably contact the peripheral edge of the opening when the shutter is moved, and is provided so as to protrude and retract. A contact member. Further, the O-ring is brought into contact with the peripheral edge of the vacuum chamber without sliding, and the vacuum chamber is hermetically sealed. Even when the vacuum chamber is in a vacuum state, the rear surface of the shutter is surrounded by the peripheral edge of the opening by the O-ring. It is made not to touch.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 show an embodiment of the present invention, and an apparatus main body 12 of a vacuum forming machine 10 according to this embodiment is assembled on a base 16 by assembling side plates 14 and a ceiling plate into a rectangular parallelepiped shape. It is a thing. A rectangular opening 13 is provided on the front surface of the apparatus main body 12 and communicates with a vacuum chamber 15 that is a molding space in the apparatus main body 12. A shutter 22 that is movable in the vertical direction is attached to the opening 13 of the vacuum chamber 15 of the apparatus main body 12, and the opening 13 is provided so as to be hermetically sealed.

  The shutter 22 is supported by an elevating device 20 including a hydraulic cylinder or an air cylinder attached in the vertical direction to the center of the base of the apparatus main body 12. In the lifting device 20, the tip of the lifting rod is connected to the central portion of the shutter 22, and both side edges of the shutter 22 are guided by a lifting guide portion (not shown). Biasing devices 24 that press the shutter 22 against the peripheral edge of the opening 13 of the apparatus main body 12 are attached to both side edges of the apparatus main body 12 at the closed position of the shutter 22.

  As shown in FIG. 5, an O-ring 26 is attached to the peripheral edge of the rear surface side of the shutter 22 so as to surround the opening 13 of the vacuum chamber 15. The O-ring 26 is closely fitted in the O-ring groove 28 of the shutter 22. The urging device 24 may be an air cylinder or the like, and may be lightly pressed so that the O-ring 26 of the shutter 22 contacts the peripheral edge of the opening 13. Then, the O-ring 26 is brought into contact with the peripheral portion of the vacuum chamber 15 without being slidably contacted by the urging device 24 so that the inside of the vacuum chamber 15 can be sealed.

  In the vicinity of the O-ring 26 of the shutter 22, the O-ring 26 protrudes from the outer surface of the O-ring 26 so that the O-ring 26 does not slide on the surface of the apparatus main body 12 at the peripheral edge of the opening 13 when the shutter 22 moves up and down. The front end portion is located at a position, and a plurality of abutting members 29 that are protruded by springs and provided so as to protrude and retract are provided. Since the O-ring 26 is closely fitted in the O-ring groove 28, the back surface of the shutter 22 does not come into contact with the peripheral edge of the opening 13 by the O-ring 26 even when the vacuum chamber 15 is in a vacuum state.

  A pair of side plates 14 of the apparatus main body 12 are provided with plate-like side holding members 30 in the horizontal direction along both sides of the vacuum chamber 15. Each side holding member 30 has a pair of support columns 32 fitted and fixed in through holes penetrating vertically. Below the column 32, an elevating device 36 having a hydraulic cylinder 34 is provided, and each elevating device 36 has a pair of elevating posts 38 connected and fixed by a piston of the hydraulic cylinder 34 and a holding member (not shown). Yes. As a result, the upper die mounting plate 41 provided between the pair of side holding members 30 is moved up and down by the hydraulic cylinder 34 via the lifting post 38. Further, when the upper die mounting plate 41 is raised by the lifting device 36 beyond a predetermined position, one end edge of the upper die mounting plate 41 abuts on the fixing member 43, and the lifting device 36 moves the upper die mounting plate 41. By raising, the upper die mounting plate 41 swings around the fixing member 43, and the inner surface of the upper die 44a fixed integrally is exposed to the near side.

  Upper and lower molds 44 are placed on the mold receiving plate 40, and a lower heating plate and a lower heat insulating plate (not shown) are provided below the mold receiving plate 40, and these are movable plates 48 in the apparatus main body 12. It is placed on top. The upper mold 44 a is integrally attached to the lower surface of the upper mold mounting plate 41. An upper heat insulating board is provided on the lower surface of the ceiling board of the apparatus main body 12, and an upper heat board is provided below the upper heat insulating board, and is located near the upper part of the upper mold 44a. The structure of these hot plates can be set as appropriate.

  A main cylinder 53 in which a ram 52 of a hydraulic cylinder device 50 is fitted is provided in the apparatus main body 12, and two auxiliary cylinders 54, 55 for moving a mold and a movable plate up and down on both sides of the main cylinder 53. Is provided. The main cylinder 53 and the two auxiliary cylinders 54 and 55 are formed by hollowing out a steel material such as cubic mild steel having a predetermined thickness. The auxiliary cylinders 54 and 55 are fitted with metal rod-like auxiliary pistons 56 and 57, respectively. The auxiliary pistons 56 and 57 may be formed by finishing the side surface of a cylindrical metal rod into a mirror surface. A hydraulic pump 66 (described later) is connected to the main cylinder 53 and the auxiliary cylinders 54 and 55 of the hydraulic cylinder device 50 through a hydraulic circuit (not shown). A movable platen 48 is fixed to the upper end of the ram 52, and the ram 52 can be raised by applying hydraulic pressure from a hydraulic port (not shown) formed in the hydraulic cylinder device 50.

  The vacuum forming machine 10 according to this embodiment has the apparatus main body 12 installed on a base 16, a hydraulic tank 68 is provided on the back surface thereof, and a hydraulic pump 66 is further provided on the rear portion. In addition, one vacuum pump (not shown) is installed. An electric control unit 64 is installed on the upper part of the apparatus main body 12, and a display unit 65 is attached to the front.

  Next, operation | movement of the vacuum forming machine 10 of this embodiment is demonstrated below. First, the shutter 22 of the apparatus main body 12 is lowered to open the vacuum chamber 15, the mold receiving plate 40 is pulled out along the side holding member 30, moved to the vacuum chamber after the mold is placed, Place the mold receiving plate 40 on the plate. The movement at this time is performed by the movement motor 70. Note that a sliding device driven by an air cylinder (not shown) may be used instead of the moving motor.

  Thereafter, the shutter 22 is raised along the lifting device 20 to close the opening 13 of the vacuum chamber 15. At this time, in the shutter 22, the O-ring 26 does not come into contact with the peripheral edge portion of the opening portion 13 by the abutting member 29 provided so as to freely protrude and retract. When the shutter 22 comes to a position facing the opening 13, the shutter 22 is pressed against the peripheral edge of the opening 13 by the urging device 24, and the inside of the vacuum chamber 15 is sealed through the O-ring 26. At this time, the O-ring 26 may be pressed so as to be in contact with the entire periphery of the peripheral edge of the opening 13. When the vacuum pump is activated and the inside of the vacuum chamber 15 is evacuated, atmospheric pressure is applied to the surface side of the shutter 22, and the O-ring 26 closely contacts the peripheral edge of the opening 13. Even in this state, the O-ring 26 is in close contact with the entire periphery of the periphery of the opening 13 of the vacuum chamber 15, and the shutter 22 itself does not contact the periphery of the opening 13. This is because the O-ring 22 is closely fitted in the O-ring groove 28 and there is no space for absorbing deformation, so that the O-ring 22 does not collapse more than a certain amount.

  Next, hydraulic pressure is applied to the hydraulic cylinder device 50 by the hydraulic pump 66 to raise the ram 52 and raise the movable platen 48. At this time, the hydraulic circuit is switched so that the hydraulic pressure from the hydraulic pump 66 is applied to the auxiliary cylinders 54 and 55 during the period in which the movable plate 48 only rises to the press position, and the movable piston 48 is moved by the auxiliary pistons 56 and 57. The ram 52 is raised via The main cylinder 53 of the ram 52 is made to suck in oil that is not pressurized through the bypass line 69. Thereby, the auxiliary pistons 56 and 57 are quickly raised, and the movable platen 48 and the ram 52 can be quickly raised. Thereafter, at the time of molding by the upper mold 44a and the lower mold 44b, the valve of the bypass pipe 69 is closed, the hydraulic pressure by the hydraulic pump 66 is applied into the main cylinder 53, and the ram 52 is pushed up. As a result, a large force acts on the mold 44, and the molding material inside is pressed by the mold 44 sandwiched between the hot plates to be molded into a predetermined shape.

  According to the vacuum molding machine 10 of this embodiment, the sealing of the opening 13 of the vacuum chamber 15 can be easily achieved by the O-ring 26 of the shutter 22, and the vacuum chamber 15 is evacuated to reliably form an airtight state. Is done. Further, since the O-ring 26 is in close contact with the peripheral edge of the opening 13 of the vacuum chamber 15 and the shutter 22 itself is not in contact, the airtight state can be achieved more reliably and easily. Further, since the O-ring 26 does not slide on the peripheral edge of the vacuum chamber 15 when the shutter 22 is opened and closed, the O-ring 26 is hardly worn.

  In addition, since the hydraulic cylinder device 50 raises the movable platen 48 and the ram 52 by applying hydraulic pressure to the auxiliary cylinders 54 and 55, the auxiliary pistons 56 and 57 are quickly raised, the operation speed is high, and molding is performed. Sometimes, the ram 52 can be molded with great force.

  The vacuum molding machine of the present invention is not limited to the above-described embodiment, and the shape of the shutter, the drive structure, the mold loading / unloading mechanism, and the like can be changed as appropriate.

It is a front view of the vacuum forming machine of one embodiment of this invention. It is a right view of the vacuum forming machine of this embodiment. It is a schematic perspective view of the hydraulic apparatus of this embodiment. It is a longitudinal cross-sectional view of the hydraulic apparatus of this embodiment. It is a general | schematic partial side view of the vacuum forming machine of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vacuum forming machine 12 Apparatus main body 13 Opening part 15 Vacuum chamber 20, 36 Lifting apparatus 22 Shutter 24 Energizing apparatus 26 O-ring 29 Contact member 44 Mold 48 Movable board 50 Hydraulic cylinder apparatus 52 Ram 54, 55 Auxiliary cylinder 55 Main Cylinders 56, 57 Auxiliary piston

Claims (4)

  It has a vacuum chamber that accommodates the mold and is evacuated, covers each surface of the device body in a sealed state, forms the vacuum chamber inside in an airtight state, and is located in front of the vacuum chamber and can be opened and closed freely. In a vacuum molding machine provided with a shutter that can be closed and airtight, and provided with a hydraulic cylinder inside, an auxiliary cylinder part for moving the mold and an auxiliary piston are provided on both sides of the ram of the hydraulic cylinder. An O-ring that is attached to the peripheral edge of the back surface of the shutter and surrounds the opening on the front surface of the vacuum chamber in an airtight state; and an urging device that contacts the O-ring of the shutter with the front surface of the vacuum chamber. The ring comes into contact with the peripheral edge of the vacuum chamber without sliding, and seals the vacuum chamber. When the vacuum chamber is in a vacuum state, the ring is in close contact with the peripheral edge of the opening by the force of atmospheric pressure. Specially Vacuum molding machine to be.   Near the O-ring of the shutter, the O-ring protrudes to a position protruding from the O-ring surface so that the O-ring does not slidably contact the peripheral edge of the opening when the shutter moves. The vacuum forming machine according to claim 1, further comprising a contact member.   It has a vacuum chamber that accommodates the mold and is evacuated, covers each surface of the apparatus body in a sealed state, forms the vacuum chamber inside in an airtight state, and can be opened and closed on the front surface of the vacuum chamber. In a vacuum molding machine provided with a shutter that can be brought into an airtight state and provided with a hydraulic cylinder inside, a small-diameter auxiliary cylinder part and an auxiliary piston for moving the mold parallel to both sides of the ram of the hydraulic cylinder An O-ring attached to the peripheral edge of the shutter and surrounding the opening on the front surface of the vacuum chamber in an airtight state is provided, and the O-ring is in close contact with the peripheral edge of the opening in an airtight state. Molding machine. It has a vacuum chamber that accommodates the mold and is evacuated, covers each surface of the apparatus body in a sealed state, forms the vacuum chamber inside in an airtight state, and can be opened and closed on the front surface of the vacuum chamber. In a vacuum molding machine provided with a shutter that can be airtight in a closed state and provided with a hydraulic cylinder inside, an O-ring that is attached to the peripheral edge of the shutter and surrounds the opening on the front surface of the vacuum chamber in an airtight state; And an urging device for bringing the shutter O-ring into contact with the front surface of the vacuum chamber. The O-ring is brought into contact with the peripheral edge of the vacuum chamber without sliding, and the vacuum chamber is sealed. By being in a state, it is tightly adhered to the peripheral edge of the opening by the force of atmospheric pressure, and the back surface of the shutter does not contact the peripheral edge of the opening by the O-ring even when the vacuum chamber is in a vacuum state. Vacuum forming machine, wherein the door.

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