JPS608936B2 - Vacuum pressure air forming equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a multi-sided vacuum pressure forming apparatus.

Multi-sided vacuum-pressure forming apparatuses are known per se today. However, in most known devices of this type, the surface of the mold is heated by a heating device or hot plate that heats the sheet to be formed, while the side of the frame that firmly holds the mold is heated by a cooling device. It is cooled. That is, in the known device, the mold cavity is fixed to the cooling device fixed to the frame by a tightening member such as a screw, and the knock pin and knock pin guide plate of the knockout mold arranged inside the cavity are connected to the cooling device. It was worn. Furthermore, the bushing that guides the dowel pin and the mold guide plate that supports the cavity are also disposed in fixed relation to the water cooling device. In particular, in conventional devices, the bushing has a sleeve-like shape and is secured to the water cooling plate by suitable fastening members such as screws. This is because the bushing must be placed with a large clearance relative to the dowel pin, and the push must be properly maintained in position. Therefore, when the molding equipment is operated continuously for a long time, when there are significant temperature changes in the atmosphere, or when the operation of the water cooling equipment becomes weak, each member undergoes different thermal changes, causing extra friction in the operation of the entire equipment. In the worst case scenario, parts may be damaged or the equipment may have to stop working. In order to solve such problems, the clearances between the mold and the cavity, between the dowel pin and the bushing, and between the mold guide plate and the mold base frame have been adjusted in advance. The methods used were to either keep a large piece or to modify the parts that had become more hit due to thermal expansion.

Therefore, the spacing between parts becomes too large, making it difficult to assemble the parts, requiring considerable skill or experience for on-site adjustment, requiring a long time for repairs, and even requiring water cooling of the knock plate. I was removing the bush. This has resulted in significant time, economic, and even human losses. It is an object of the present invention to provide a vacuum-pressure forming apparatus that prevents the apparatus from creaking even when such thermal changes occur and prevents drive failures.

Specific examples of the present invention will be described below. FIG. 1 is a surface view of the device 10 of the present invention, and FIG. 2 is a partially sectional view of the device 10 of the present invention.

The device 10 includes a mold base 12, a mold base frame 14 fixed to the base 12, and a mold unit 20 mounted within the base 12 and frame 14. Here, the mold unit 20 includes a knockout mold 30 located at the center of the unit 20, a mold cavity 32 disposed radially outward of the knockout mold 30 with a gap C5, and an outer upper surface of the cavity 32. a mold cavity auxiliary member 34 fixed to the cavity 32, a mold guide plate 16 arranged on the frame with an appropriate gap and fixed to a water cooling device to be described later, and a mold base 12.
a water cooling device 18 fixed to the mold 30 and one end fixed to the mold 30;
a knock pin 22 attached to the knock pin 22; a knock pin guide plate 24 swinging at the other end of the knock pin 22;
It consists of a bush 26 that guides the knock pin 22, a spring 28, etc. arranged around the knock pin 22 between the push 26 and the plate 24. However, these are not restrictive in any way. The knock pin 22 in the illustrated example has a male thread at its upper end, a hole at its lower end, and a female thread formed in the hole.

The upper end of the pin 22 is screwed into a hole provided in the knockout mold, and a knock pin guide plate 24 is loosely connected to the lower end of the pin 22 to hold the plate 24. A rod 36 having a flange is screwed into the lower end of the rod. The upper part of the knock pin 22 is guided and supported by a pusher 26. A spring 28 is inserted between the lower end of the pusher 26 and the plate 24. The upper end of the bush 26 is releasably in contact with the water cooling device 18 which is fixedly connected to the mold base 12 by the elastic force of the spring 26. The water cooling device 18 is similar to a known device. Mold guide plate 1
6 has a flange part 17 on its upper part, and the flange part 1
7 contacts the upper surface of the main body 32 and limits the vertical movement of the main body 32.

Also, this plate 16 has a hole 15 as shown in FIG.
It is fixed to the water cooling device by threading through the hole 15. Further, this plate 16 is provided with an idler and a C2 between the mold cavity main body 32 and the frame 14, respectively.
The flange portion 17 of the plate 16 and the auxiliary member 34 have a C3 smaller than the above C.
It has a gap of The bush 26 supporting the knock pin 22 is preferably a bearing, and the outer side of the bush 26 has a gap C4 between it and the water cooling device 18 and is in a loose formation.

The knock pin guide plate 24, which is loosely attached to the knock pin 22, functions to adjust the timing of the knock pin 22, especially when taking out a large number of molded products. The operation of the device according to the invention is similar to that of known devices of this type.

However, this device operates, and mold 30 and cavity 3
2 causes thermal deformation, the deformation is absorbed by the gaps C5, C, and C3, and the mold guide plate 1
Similar thermal deformations of C2 are absorbed by C2, so that none of these thermal deformations exert any bias on frame 14.
Further, thermal deformation of the knock pin 22 and the bush 26, which expand thermally due to heat transfer from the mold 30, is appropriately absorbed by the gap C4.

Furthermore, thermal deformation of the bearing 26 and plate 24 is absorbed by the spring 28. In this way, in the vacuum-pressure forming apparatus of the present invention, the thermal deformation of each part of the apparatus is absorbed individually by each part, and the thermal deformation that occurs in the past causes the apparatus to squeak, large friction, and drive failures. This ensures that the molding process is always normal without any problems.

As is clear to those skilled in the art, the present invention can reduce thermal changes that occur due to the synergistic relationship of processing or assembly errors of each member even though the bush and cavity mold are fixed to the same water-cooled plate during multi-chamber work. It can be completely absorbed, and there is no need for any operational difficulties or post-adjustments.

Further, during trimming required in normal molding operations, the product undergoes large shrinkage deformation, especially in multi-sided molding, between the time of molding and the trimming. This deformation varies slightly depending on changes in cooling time, molding time, sheet properties, room temperature, seasons, etc., and may even cause punching misalignment. In such cases, in conventional equipment, the cavity mold is fixed to the water cooling device with screws, etc.
Because it was difficult to adjust, it was necessary to make a new punching die for the forming die or make major modifications. However, according to the present invention, this mold unit 201, which is competing with the hole 15 of the plate 16, can quickly and freely contract within the range of the gap C3 by simply loosening the few fastening screws used from the mold surface. It can be adjusted according to the amount. If adjustment of C3 or higher is required, please refer to “Flange 1 of plate 16”.
Adjustment up to the range C can be easily achieved by simply removing only the 7th part. The present invention is not limited to the female mold shown in the above embodiments, but the excellent effects of the present invention can be similarly obtained with a male mold.

In that case, it is clear to those skilled in the art that the mold guide plate 16 becomes a knockout plate.

[Brief explanation of drawings]

FIG. 1 is a surface view of the device of the present invention, and FIG. 2 is a partial cross section of the device of the present invention. Explanation of symbols, 10; Vacuum and pressure forming device, 12; Mold base, 14; Mold base frame, 16; Mold guide plate, 18; Water cooling device, 20; Mold, 22;
Dowel pin, 24; Dowel pin guide plate, 26;
Bush, 28; Spring, 30: Knockout mold, 32; Mold cavity, 34; Mold cavity auxiliary member, 36; Rod. Figure 2

Claims (1)

[Claims] 1 Consists of a mold base, a mold base frame fixed to the mold base, and a mold unit placed in an air space defined by the mold base and the mold base frame, and the mold unit is connected to the mold and the cavity. and a mold guide plate, a water cooling device, a knock pin, and a bush, the water cooling device being fixed to the mold base, the mold guide plate being fixed to the water cooling device, and disposed radially outward of the mold. A gap is provided between the cavity, the mold guide plate that prevents the cavity from coming off from the water cooling device, and the guide plate, and a bush that supports a dowel pin that releases the product from the mold. A vacuum-pressure forming apparatus characterized in that it is disposed so as to be detachable from a water cooling device, thereby sufficiently absorbing deformation of a mold and cavity due to thermal changes.