JPS5948B2 - Drawing processing equipment for synthetic resin sheets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drawing device for synthetic resin sheets mainly used in manufacturing instrument panels for automobiles.

Conventionally, this type of method involves drawing a synthetic resin sheet stretched between a pair of outer clamps between upper and lower drawing dies, each having a concave portion on one side and a convex portion on the other side facing each other. It is known that in this case, the sheet is subjected to local deep drawing at the concave portions and the convex portions, which is disadvantageous in that large elongation is applied to the portions, which is likely to cause damage. accompanied by.

In order to eliminate such inconveniences, a method has been proposed in which slits or other cuts are made on the sheet in advance at the deep-drawn portion; Generally speaking, such a method is troublesome to perform, and has disadvantages such as being prone to misalignment of the cut location. The purpose of the present invention is to provide a device that does not have such inconveniences, and it is possible to
In a type of drawing process performed between upper and lower drawing dies having a concave portion on one side and a convex portion on the other side facing each other, a trim blade and a plug bar are projected in advance from the concave portion and the convex portion, and each retraction is performed. When both drawing dies are closed, the plug bar first pushes the sheet into the recess and then cooperates with the trim blade to cut the sheet.
An example of implementing the present invention will be explained with reference to the attached drawings.

In the drawings, reference numeral 1 indicates a synthetic resin sheet, and the sheet 1 is made of a composite sheet in which, for example, a polyvinyl chloride or other leather sheet and a polypropyne foam or other foam sheet are laminated vertically. From the state where it is stretched between the pair of clamps 2, 2, the upper and lower drawing dies 3, 3
Draw it with. In this case, a core material 4 such as ABS resin is placed on the lower drawing die 3 in advance, and the sheet 1 is pressed onto the core material 4 and bonded thereto during the drawing process. The overall result is thus obtained, for example, in an instrument panel for an automobile. The upper and lower drawing dies 3, 3 have a concave portion 5 on one side and a convex portion 6 on the other side, which face each other, so that the sheet 1 is locally deep drawn, As a result, the sheet 1 tends to be locally stretched to a large extent and damaged. The present invention eliminates such inconveniences, and includes a trim blade 7 projecting upwardly into the interior of the concave portion 5, for example, with the convex portion 6 as the upper side, and a plug par 8 projecting downwardly on the lower surface thereof, with the convex portion 6 as the upper side, for example. Equipped with.

In this case, the trim blade 7 and the plugper 8 are allowed to retreat against the springs 9 and air cylinders 13 on the respective rear surfaces.
In the drawing, reference numeral 11 indicates a receiving frame on the outer periphery of the trim blade 9, and reference numeral 12 indicates a receiving frame on the lower surface of the plugper 8 facing the trim blade 9. To explain the operation, if the synthetic resin sheet 1 is stretched between the clamps 3, 3 on both sides, and the upper and lower drawing dies 3, 3 are set to the closed side, for example, as shown in the first figure, The sheet 1 is first pushed by the plugper 8 and bent into the recess 5, and then the trim blade 7 in the recess 5 is applied from the other side to form a slit in it as shown in the second figure. Other cuts 13 are given. The drawing die 3, 3
Upon subsequent closing, the plugper 8 and the trim blade 7 move back against the springs 9 or air cylinders 10 on their respective back surfaces to allow the drawing dies 3, 3 to close, thus allowing the drawing dies 3, 3 to close. sheet 1
is deep drawn at the cut 13 portion, and drawn as a whole between the dies 3 and 3 to become a product. At this time, the cuts 13 are effective in reducing local elongation of the sheet 1. Incidentally, the cut 13 may be arbitrarily formed such as a slit shape or a circumferential cut shape. As described above, according to the present invention, when the upper and lower drawing dies are used to draw a synthetic resin sheet, the plugper and the trim blade cooperate with each other to draw the sheet. This method provides slits or other cuts at predetermined locations, and does not have the above-mentioned disadvantages of the conventional cut-off method in which separate cuts are made in advance, and has the effect of simplifying the work.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view of an example of the device of the present invention in an intermediate operating state, and FIG. 2 is a partially cutaway side view of the device after cutting. 1... Synthetic resin sheet, 2, 2... Clamp, 3, 3... Drawing die, 5... Concavity, 6... Convex portion, 7...Trim blade, 8
...Pragper.

Claims (1)

[Claims] 1. In a type in which a synthetic resin sheet is stretched between a pair of outer clamps and then drawn between upper and lower drawing dies having a concave portion on one side and a convex portion on the other side facing each other, A trim blade and a plug bar are made to protrude in advance from the concave part and the convex part, and are prepared so as to be freely retractable. When both drawing dies are closed, the plug bar first pushes the sheet into the concave part, and then A synthetic resin sheet drawing device configured to cut the sheet in cooperation with the trim blade.