JPH044057B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to heating a film in vacuum mold making, in which a vacuum vacuum effect is applied to a filler filled in a casting flask to solidify the mold in a vacuum. Regarding equipment.

(Conventional technology) The heating of the film used for vacuum mold making is
In order to reduce energy loss and shorten heating time, there is a trend toward methods of bringing the film into direct contact with a heater device. As a method for heating and softening a film by bringing the film into direct contact with a heater, the method disclosed in Japanese Patent Application Laid-Open No. 1987-87911 filed by the applicant of the present application is generally known.

The heating of the film disclosed herein involves placing a heater stand above the model plate and bringing the film into suction contact with the bottom surface of the heater stand to heat and soften the film. When the film is adsorbed onto the model board, it may stick to the model board, causing damage to the film when it is released from the mold, and a film suction mechanism is required to bring the film into close contact with the heater stand. There were some problems.

(Object of the Invention) The present invention has been accomplished with the aim of solving the above problems.

(Configuration of the Invention) The configuration of the present invention will be described below based on examples. 1 includes a vertical frame 2 erected on a foundation at a predetermined interval, a guide frame 3 installed between the upper ends of the vertical frame 2, and a guide frame 3 at an intermediate position between the vertical frames 2. This frame is composed of an intermediate frame 4 installed in parallel, and the frame 1 has a guide frame 3 and wheels 5.
A trolley 6 engaged with is provided so as to be freely movable,
A lifting cylinder 7 is attached to the end of the truck 6 in a downward direction. A film holding frame 10 having a decompression chamber 9 around its outer periphery is suspended from the lower end of the piston rod 8 of the lifting cylinder 7 via a support member 11. A film suction member 13 is configured to apply negative pressure to the lower surface of the film holding frame 10 by the operation of a vacuum pump (not shown) that is connected to the decompression chamber 9 through a suction hose 12.
is installed.

Further, an inverted U-shaped heat-retaining hood 15 is fixed to the upper part of the film holding frame 10, and has a plurality of heat-retaining heaters 14 attached at appropriate intervals on the lower side of the inner surface. Reference numeral 16 denotes a traveling cylinder provided at the upper part of the guide frame 3 via a bracket 17. The tip of the piston rod 18 is connected to a truck 6 via a cylinder bracket 19, and the truck 6 is moved from the guide frame by the operation of the traveling cylinder 16. It is designed to be moved along 3.

A heater cart 21 with wheels 20 engaged with the intermediate frame 4 is movably disposed on the intermediate frame 4, and a heater plate 23 is mounted on the upper part of the heater cart 21 via a support 22. installed.

The heater plate 23 has a plurality of sheathed heaters embedded at regular intervals in a heater stand made of steel, etc., and a heat-resistant breathable cloth made of glass fiber or fluororesin fiber is placed on the top surface of the heater stand. A member is attached to the heater plate 23 to prevent the film from burning or welding even if the film is brought into direct contact with the upper surface of the heater plate 23 and heated.

A traveling cylinder 24 is provided on an auxiliary frame 25 via a bracket 26, and the tip of its piston rod 27 is connected to the heater truck 21.
The heater truck 21 is configured to travel along the intermediate frame 4 by the operation of a travel cylinder 24.

Reference numeral 28 denotes a film spreading stand provided at the right end position of the intermediate frame 4. At the front end of the film spreading stand 28, there is a hollow film fixing suction whose one end is connected to a vacuum pump (not shown). A box 29 is fixed to the film fixing suction box 29. A suction member 30 is attached to the top surface of the film fixing suction box 29 and communicates with the hollow portion to apply a negative pressure.

A film cutter 31 is provided at the front of the film fixed suction box 29, and a film cutter 31 is provided at the front of the film fixed suction box 29.
Film rolls 32 are disposed at the rear of each, and a film 33 is pulled out from one end.

Reference numeral 34 denotes a model plate positioned and placed on a reversible turntable 35. The model plate 34 is provided with a decompression chamber 37 inside thereof, which communicates with a vacuum pump (not shown) via a suction hose 36, and has a vacuum chamber 37 on its upper surface. A plurality of ventilation holes (not shown) are provided in communication with the decompression chamber 37.

(Operation of the Invention) In the device constructed as described above, the film 33 pulled out from the film roll 32 is held at one end by the film fixing suction box 29 and is spread out on the film spreading table 28 as shown in FIG. In the state
The film holding frame 1 is moved by operating the traveling cylinder 16.
0 is moved to the right side together with the trolley 6 and positioned above the film spreading table 28, and the film holding frame 10 is lowered by the lowering operation of the lifting cylinder 7. A suction action is exerted on the lower surface of the film holding frame 10 by the negative pressure operation of the decompression chamber 9, and the film spreading table 2 is
The film 33 on the upper surface of the film 8 is suction-held on the lower surface of the film holding frame 10 via the suction member 13 and transferred to the film holding frame 10, and then the suction holding action of the film fixing suction box 29 is released and the lifting cylinder 7 is reversely operated. Then, the film holding frame 10 holding the film 33 by suction is raised to its original position.

Next, by the pushing operation of the traveling cylinder 16, the film holding frame 10 is moved to above the heater plate 23 while sucking and holding the film 33 and pulling out the film 33 from the film roll 32. At this time, the heat insulating heater 14 is operated to keep the air temperature in the heat insulating hood 15 at 40 to 50 DEG C., and the heater plate 23 is heated to the required temperature.

Next, the film holding frame 10 is lowered by the operation of the lifting cylinder 7 and is brought into contact with the support base 22 of the heater plate 23, and the film fixing suction box 29 is again communicated with a vacuum pump (not shown) so that negative pressure is applied. Ru.

Therefore, the film 33 is cut by the film cutter 31.
, and one side is the film holding frame 10.
The other film 33 comes into direct contact with the heater plate 23 while being attracted to the lower surface of the film 33 , and one end of the other film 33 is held by attraction to the film fixing suction box 29 .

In this way, the film 33 is attached to the heater plate 23.
The film is softened by being in direct contact with it for a required period of time. At this time, the film 33 is kept warm at 40 to 50 degrees Celsius by the heat insulating heater 14, so even if the temperature of the outside air varies, the heater plate 23 is kept at a constant temperature.
The heating and softening time of the film 33 is always constant.

Next, the lifting cylinder 7 is operated to raise the film holding frame 10, and then the traveling cylinder 24 is operated to move the heater truck 21 from a position above the model plate 34 to the left. Next, the lifting cylinder 7 operates to lower the film holding frame 10 holding the film 33 until it comes into contact with the model plate 34, and at the same time, the vacuum chamber 37 of the model plate 34 is depressurized via the suction hose 36, and the film holding frame 10 holding the film 33 is lowered until it contacts the model plate 34. A suction action is applied to the upper surface, and the softened film 33 held in the film holding frame 10 is closely attached to the upper surface of the model board 34.
At this time, since the model plate 34 is not heated by the heater plate 23 during film heating, the film 33 does not stick to the model plate 34.

Next, after releasing the negative pressure in the decompression chamber 9 of the film holding frame 10, the lifting cylinder 7 is operated to hold the film 33 on the model plate 34 side and return the film holding frame 10 to its original height.

Next, the traveling cylinders 16 and 24 are operated to move the film holding frame 10 above the film spreading table 28 and the heater cart 21 to a position above the model plate 34. On the other hand, the model plate 34 to which the film 33 is closely attached is rotated by a turntable and moved to the model building position, and another model plate 34 is moved to a position below the heater cart 21. The above operation is repeated.

(Effects of the Invention) As is clear from the above description, in the present invention, the film is heated by an upward heater plate above the model plate, so that the model plate is no longer heated by the heater plate. The film will no longer stick to the model board. Further, the film can be heated simply by placing the film on the heater plate, which has excellent effects such as eliminating the need for a special device for closely adhering the film to the heater plate.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a main part showing an embodiment of the present invention. 9: Decompression chamber, 10: Film holding frame, 12: Suction hose, 13: Adsorption member, 23: Heater plate,
34: Model board, 36: Suction hose, 37: Decompression chamber.

Claims (1)

[Claims] 1. Disposed above the model plate 34 equipped with film suction mechanisms 36 and 37 so as to be movable up and down relative to the model plate 34 and movable;
It consists of a film holding frame 10 having film suction mechanisms 9, 12, and 13 around the outer periphery of the lower end, and an upward heater plate 23 disposed at an intermediate position between the model plate 34 and the film holding frame 10 so as to be able to enter and exit. Film heating device for vacuum mold making.