JP2560070B2 - Molding equipment for synthetic resin products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Objectives of the Invention (1) Field of Industrial Application The present invention relates to a molding apparatus for synthetic resin products, and in particular, a material sheet corresponding to the size of a product rather than a long synthetic resin original sheet. A cutting machine for cutting the material sheet, a male die disposed below the material sheet, and an male die disposed above the material sheet to cooperate with the male die to obtain an intermediate product by drawing the material sheet. The present invention relates to a molding device including a female mold, and a male mold provided with a plurality of vacuum holes that are opened in a molding surface of the male mold to suck and closely contact an intermediate product to the molding surface.

(2) Conventional technology When a raw material sheet is cut to obtain a raw material sheet, the cut surface of the raw material sheet after cutting must be free unless the vicinity of the cut portion of the raw sheet is held in the cut surface. Therefore, the material sheet may be displaced relative to the male mold.

Therefore, conventionally, a plurality of locking pins are pierced in the vicinity of the cut portion of the original sheet to prevent displacement of the material sheet.
After cutting, the material sheet held by the locking pin and the original sheet conveying member is stretched and covered with the male sheet.

(3) Problems to be Solved by the Invention However, with the above-mentioned configuration, when the material sheet is put on the male mold, the elongation around each locking pin of the material sheet becomes large, and the product thickness becomes uneven. In addition, when the material sheet has a thin pattern such as a cowhide pattern, the pattern is disturbed due to the elongation of the material sheet, resulting in a problem that a product with high commercial value cannot be obtained.

It is an object of the present invention to provide the molding apparatus that can solve the above problems.

B. Structure of the Invention (1) Means for Solving the Problem The present invention is directed to a cutting machine for cutting a material sheet corresponding to the size of a product from a long synthetic resin original sheet, and a cutting machine below the material sheet. The male mold provided includes a male mold and a female mold which is arranged above the material sheet and cooperates with the male mold to obtain an intermediate product by drawing the material sheet. In a molding apparatus for a synthetic resin product having a plurality of vacuum holes for opening the molding surface of the intermediate product to suck and adhere the intermediate product to the molding surface, the male mold outer surface is surrounded by the female mold side. An elevating cover frame is arranged to move down and cover the material sheet on the male mold. On the male mold side, the cut portion of the original seed is cooperated with the cover frame before cutting the original sheet. The material sheet is clamped in the vicinity and descends when the material sheet is placed on the male mold. An elevating sandwiching plate for sliding the sandwiched portion of the sheet is provided, and the entire outer peripheral portion of the material sheet is hermetically sealed between the male base end and the covering frame. It is characterized in that a seal portion sandwiched between is provided.

(2) Operation With the above-mentioned configuration, the material sheet can be sandwiched by the cooperation of the cover frame and the sandwiching plate, and the displacement of the material sheet with respect to the male mold can be prevented.

Further, by lowering the cover frame, the material sheet can be sufficiently conformed to the male mold and covered. At that time, since the sandwiched portion of the material sheet is slipped, it is possible to suppress the elongation of the material sheet as much as possible and avoid the occurrence of problems such as uneven thickness and disordered patterns.

Further, in the suction adhesion process using each vacuum hole, the entire outer peripheral portion of the material sheet, and thus the entire outer peripheral portion of the intermediate product is airtightly sandwiched between the cover frame and the seal portion, so that the intermediate product is securely attached to the male molding surface. To improve the dimensional accuracy of the product.

(3) Example FIG. 1 and FIG. 2 show an instrument panel I for automobiles. The instrument panel I is a synthetic resin core material c.
And a skin material s as a synthetic resin product laminated and adhered to the core material c. Simultaneously with the molding, the skin material s is adhered to the preformed core material c.

FIG. 3 shows a molding apparatus for skin material used for manufacturing the instrument panel I, which machine simultaneously obtains two skin materials s, and thus the instrument panel I, in one molding operation. Is configured as follows.

That is, the upper substrate 1 and the lower substrate 2 are disposed so as to face each other, and the piston rods 3 and 4 of the operating cylinders that raise and lower them are connected to the substrates 1 and 2, respectively.

The upper support frame 5 is attached to the lower surface of the upper substrate 1,
On the support frame 5, the first and second female molds 6 ₁ and 6 ₂ are suspended in parallel with each other so as to have a point-symmetrical relationship. Further, a lower support plate 7 is attached to the upper surface of the lower substrate 2, and the support plate 7 has
The first and second male molds 8 ₁ and 8 ₂ are arranged parallel to each other so as to have a point-symmetrical relationship. The concave molding surfaces 9 of the _first and second female molds 6 ₁ and 6 ₂ are
The first and second male molds 8 ₁ and 8 ₂ face the concave molding surfaces 10 respectively, and the cooperation of the molding surfaces 9 and 10 applies overmolding to the skin material sheet. In this case, each convex molding surface 10
Top region of the exhibits the slope of the downlink odor distribution outward from the two great men die 8 _1, 8 ₂ opposing outer surface side.

The lower first female 6 _1, synthetic resin material sheets of the first male mold ₈₁ to put covered frame 11 (FIG. 4) is disposed, the cover frame 11 is 8 ₁ outer surface first male It has an opening 12 that can surround the. The plurality of support rods 13 projecting from the cover frame 11 top mounted on a common mounting plate 14 through the first male mold ₆₁ and the upper supporting frame 5 slidably. The mounting plate 14 is
It is connected to a piston rod 16 of an operating cylinder 15 which is erected on the upper surface of the upper substrate 1, whereby the cover frame 11 can move up and down, and abuts against the lower end surface of the first female die 6 _{1 at} the upper limit thereof,
Also the lowermost can abut the sealing portion 17 provided on the first base end entire periphery of the male die 8 _1.

In the first male 8 _1, second male than its sealing section 17 8 ₂
A projecting portion 18 is provided so as to project to the side, and the projecting portion 18 cooperates with the cover frame 11 to raise and lower the sandwiching plate 19 that sandwiches the vicinity of the cut portion of the raw material sheet synthetic resin sheet. It is arranged. That is, the support plate 20 is attached to the lower surface of the sandwiching plate 19, the support plate 20 penetrates the overhanging portion 18 slidably, and the retaining plate 21 is fixed to the lower end of the retaining plate 21.
A plurality of springs 22 that keep the holding plate 19 in an upward tendency are contracted between the lower support plate 7 and the lower support plate 7.

The elastic force of these springs 22 makes the material sheet the first male type.
8 holding plate 19 by the pressing force of the cover frame 11 by the operation of the working cylinder 15 when put in ₁ is set to provide a slip to be clamping portion of the material sheet is lowered.

In the second female and male molds 6 ₂ and 8 ₂ as well, the covering frame 11
Also, a holding plate 19 is provided, and therefore, the same components as those described above are designated by the same reference numerals.

A cutting machine 23 is arranged between the first and second female dies 6 ₁ and 6 ₂ and the first and second male dies 8 ₁ and 8 ₂ . The cutting machine 23 is used to cut a material sheet corresponding to the size of the skin material s from a long original sheet. In the illustrated example, the cutting machine 23 is used to divide the original sheet into two parts, and is configured as follows.

That is, the cutting machine 23 uses the cutting mechanism 24 on the _first and second female molds 6 ₁ and 6 ₂ sides.
And a receiving mechanism 25 on the _first and second male molds 8 ₁ and 8 ₂ sides. The cutting mechanism 24 includes an operating cylinder 26 provided upright on the upper support frame 5, a holder 28 connected to the downward piston rod 27, and a cutting blade 29 attached to the lower end of the holder 28 and heated to a high temperature. ing. The receiving mechanism 25 is a double bulge
A hollow holding body 30 which is disposed between 18 and whose upper and lower surfaces are open, an elevating body 32 which is slidably retained by the hollow retaining body 30 and has a rubber receiving plate 31 on its upper surface, and an elevating body 32. And a plurality of springs 33 that are contracted between the lower support plates 7 and keep the elevating body 32 in a rising tendency, and the receiving plate 31 faces the cutting blade 29.

Each of the first and second male molds 8 ₁ and 8 ₂ has a vacuum chamber 34 formed therein and a plurality of vacuum holes 35 communicating with the vacuum chamber 34 and opening to the molding surface 10. The chamber 34 is connected to a vacuum pump (not shown).

The original sheet conveying member 36 is disposed so as to be located on both outer sides of the first and second male molds 8 ₁ and 8 ₂ . The conveying member 36 is configured so as to be able to reciprocate in a direction orthogonal to the paper surface in FIG. 3, and has a plurality of pins pierced into the side edge portion of the original sheet.
A slidable pin holder 38 having 37 and a receiving member 39 for receiving each pin 37 are provided.

Next, a manufacturing operation of the instrument panel I will be described.

As shown in FIG. 3, before the skin material forming operation,
The first and second female molds 6 ₁ and 6 ₂ are rising, and the first and second male molds 8 ₁ and 8 ₂ are descending. Both cover frames 11 move up and the first and second female molds 6 ₁ , 6
Abutting on the lower end surface of ₂ , the two holding plates 19 are in the raised position by the elastic force of each spring 22.

A preformed core material c is fitted to the molding surfaces 10 of the first and second male molds 8 ₁ and 8 ₂ , and a plurality of through holes 40 formed in the core material c.
Respectively correspond to the plurality of vacuum holes 35 of the first and second male molds 8 ₁ and 8 ₂ . An adhesive is applied to the surface of each core material c, so that the skin material s is bonded to the core material c at the same time when the skin material s is molded. Therefore, the core material c forms a part of the first and second male molds 8 ₁ and 8 ₂ for forming the skin material.

The original sheet Os has a size large enough to obtain the two skin materials c, and is heated and softened and then the first and second sheets are transferred by the conveying member 36.
It is conveyed above the male molds 8 ₁ and 8 ₂ .

As Figure 5 indicated by a solid line, first, second male 8 _1, 8 ₂ two great men die 8 ₁ is raised, and 8 ₂ by an original sheet Os tossing, be cut existing in the center of the original sheet Os The part p is positioned directly below the cutting blade 29.

As shown by the chain line in FIG. 5, the pin holder 38 of the conveying member 36 is swung to remove each pin 37 from the original sheet Os. Further, by operating both operating cylinders 15, both cover frames 11 are lowered to push down the original sheet Os, and both sides of the cut portion p are clamped by the cover frames 11 and the clamp plates 19, respectively, and substantially simultaneously with the clamping. By the operation of the operating cylinder 26, the cutting blade 29 is lowered to sandwich the cut portion p with the receiving plate 31, and the cut portion p is melted.

As a result, two material sheets B corresponding to both skin materials s
(FIG. 6) is obtained. In this case, the first and second male types 8 ₁ , 8 ₂
Since the top area of the convex molding surface 10 in Fig. 2 presents a downward slope toward the outside, and the amount of hanging of both material sheets B on the outside of the first and second male molds 8 ₁ and 8 ₂ is large. , Both material sheets B try to slide to the outside of both male molds 8 ₁ and 8 ₂ , but the inside of both material sheets B is sandwiched by both cover frames 11 and both sandwiching plates 19, so that the above sliding is performed. Therefore, it is possible to prevent the displacement of the two material sheets B with respect to the two male molds 8 ₁ and 8 ₂ .

Since Post said fusing is the same for both materials sheet B, the first female mold by the male 6 _1, 8 _1, illustrating the bonding operation.

As shown in FIG. 6, the cover frame 11 surrounds the outer surface of the first male die 8 _{1 and} descends so that the material sheet B is the first male die.
Placed over the 8 _1, the Saikyo holding plates 19 is lowered by being pressed by the cover frame 11, thereby to be clamping portion n of the material sheet B is given slip.

Material Sheet B is overlaid is let soften enough to the first male mold ₈₁ by the cover frame 11, so that time can be minimized suppressing elongation of the material sheet B by sliding of the nipped portion n, the material sheet B It is possible to avoid the occurrence of defects such as non-uniform thickness and irregular pattern.

As shown in FIG. 7, the descent limit of the cover frame 11, and abuts against the sealing portion 17 of the cover frame 11 resides in the first base end entire periphery of the male _81, thereby the outer peripheral portion of the material sheet B The whole cover frame
It is airtightly sandwiched between 11 and the seal portion 17.

As shown in FIG. 8, the first female die 6 ₁ is lowered and fitted into the first male die 8 ₁ , and the material sheet B is subjected to drawing by the female and male die 6 ₁ , 8 _1. To obtain an intermediate product i.

As shown in FIG. 9, the air inside the intermediate product i is sucked through the vacuum chamber 34, the vacuum holes 35, and the through holes 40 so that the intermediate product i is transferred to the molding surface 10 of the first male die 8 ₁ and the core material c. To form a skin material s, and at the same time, bond the skin material s to the core material c.

In the suction adhesion process using the vacuum holes 35 and the like, the entire outer peripheral portion of the material sheet B, that is, the entire outer peripheral portion of the intermediate product i is airtightly sandwiched between the frame 11 and the seal portion 17, so that the intermediate product i is it is possible to improve the dimensional accuracy of the skin material s by securely adhered to the convex forming surface 10 of the male die 8 _1.

After the above work, the skin material s is subjected to a predetermined trimming process to obtain an isostomentoment panel I shown in FIGS.

C. Effect of the Invention According to the present invention, it is possible to prevent the material sheet from being displaced with respect to the male mold, suppress the elongation of the material sheet as much as possible, and further improve the dimensional accuracy. High synthetic resin products can be obtained.

[Brief description of drawings]

1 and 2 show an instrument panel, FIG. 1 is an overall plan view, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is a longitudinal sectional view of a molding apparatus, and FIG. Is a sectional view taken along the line IV-IV in FIG. 3, and FIGS. 5 to 9 are explanatory views of the molding operation corresponding to FIG. B …… Material sheet, Os …… Original sheet, i …… Intermediate product,
n: to be clamped, s: skin material as a synthetic resin product, 6 ₁ , 6 ₂ ... first and second female molds, 8 ₁ , 8 ₂ ... first and second male molds, 10 …
… Convex molding surface, 11 …… Cover frame, 17 …… Seal part, 19 ……
Holding plate, 23 ... Cutting machine, 35 ... Vacuum hole

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tomoshige Akiyama 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (56) References Japanese Patent Publication No. 62-10092 (JP, B2)

Claims (1)

(57) [Claims] 1. A cutting machine for cutting a material sheet corresponding to a size of a product from a long synthetic resin original sheet, a male die disposed below the material sheet, and a material sheet above the material sheet. A female die which is arranged to obtain an intermediate product by drawing the material sheet in cooperation with the male die, and the male die is opened at a molding surface thereof to form the intermediate product. In a molding apparatus for a synthetic resin product provided with a plurality of vacuum holes which are suction-adhered to a molding surface, the male mold is surrounded by the male mold outer surface and is lowered to cover the material sheet on the male mold. A flexible cover frame is provided, and before the original sheet is cut, the vicinity of the cut portion of the original sheet is clamped on the male mold side in cooperation with the cover frame, and the material sheet is covered on the male mold. Occasionally, it moves down to give a grip to the clamped part of the material sheet. And a seal portion for abutting the cover frame and hermetically sandwiching the entire outer peripheral portion of the material sheet between the cover frame and the base frame. Molding equipment for synthetic resin products.