JPH1086175A - Method for injection molding of molding covered with skin and its injection molding mold assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity by pressing a skin to a mating surface of a mold based on a pressing force by an arm of a skin introducing robot, and eliminating necessity for piercing clamping pins of the mating surfaces into the skin. SOLUTION: The method for injection molding of a molding covered with a skin comprises the skin set step of inserting the skin 13 into a holding groove 41a of a skin holder 41 disposed on one mold 32 to hold the skin 13, mold clamping step of clamping the skin 13 by piercing clamping pin 27 projecting from the other mold 22 into the skin 13 via the holder 41 based on the mold clamping operation simultaneously upon clamping the molds 22, 32, and injection molding step of injecting molten material between the molds 22 and 32 of a clamped state to mold a molding and to simultaneously integrally connect the molding with a rear surface of the skin 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding method for a molded article covered with a skin and an injection mold apparatus therefor. For example, a flat molded article is injection molded and, at the same time, the molded article is covered with a skin. The present invention relates to an injection molding method of a molded article which is integrally joined to a back surface of the molded article and thereby is covered with a skin to obtain a product such as a trim board, and an injection mold apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, in order to form a flat molded product by injection molding and simultaneously join the molded product integrally to the back surface of a skin, as shown in FIGS.
Mold mating surface 133 of movable mold 132 that is operated to open and close the mold
Is provided with a required number of fixing pins 127. On the other hand, the epidermis 113 is sucked by the epidermis holding device 153 attached to the tip of the arm 151 of the epidermis feeding robot, and the epidermis 113 is opened in the fixed mold 122.
And between the movable mold 132. Then, together with the arm 151, the skin holding device 153 is
As shown in FIG. 10, each of the fixing pins 127 of the molding surface 133 is moved forward by pushing the skin 113 against the molding surface 133 of the movable mold 132. The outer skin 113 is fixed to the movable mold 132.

After that, the epidermis 1 by the epidermis holding device 153
After the suction of the movable mold 13 is released,
2 and return to the original epidermis suction position. Here, the movable mold 132 is clamped to the fixed mold 122, and a material is injected between the fixed mold 122 and the movable mold 132 to form a molded product. The molded product is integrally joined.

[0004]

By the way, the skin holding device 153 is advanced toward the mating surface 133 of the movable mold 132 by the arm 151 of the skin feeding robot, and the skin 113 held by the skin holding device 153 is moved. Movable mold 13
2 by pressing against the mating surface 133 of the mold.
In order to pierce each of the fixing pins 127 into the skin 113, the skin 113 must be strongly pressed against the mating surface 133 of the movable mold 132, and the reaction force of the pressing causes the arm 151 of the skin feeding robot to bend. There was a case. Further, the outer skin 113 is connected to the mating surface 13 of the movable mold 132.
3 and press each fixing pin 1 of its mating surface 133
In order to reliably stab 27 into epidermis 113, much time was required and productivity was poor.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to press the skin against the molding surface of a molding die by using an arm of a skin feeding robot, and pierce each fixing pin of the molding surface into the skin. An object of the present invention is to provide an injection molding method of a molded article covered with a skin and an injection molding apparatus for the molded article, which can improve productivity by eliminating productivity.

[0006]

In order to achieve the above object, an injection molding method of a molded article covered with a skin according to the present invention is a method of injection molding a molded article covered with a skin. And a skin setting step of inserting a peripheral portion of the skin into a holding groove of a skin holding member provided in one of the molding dies and holding the skin, and At the same time as the mold is clamped, the mold is fixed by inserting a fixing pin projecting from the other mold into the periphery of the skin through the skin holding member based on the mold clamping operation. The molten material is injected between the pair of molds in the clamping and fixing step and the mold clamping state, and is cooled and solidified to form a molded article, and the molded article is integrally joined to the back surface of the skin. And an injection molding process.

Therefore, after inserting and holding the periphery of the skin in the holding groove of the skin holding member of one of the molds, the pair of molds are clamped, and at the same time, the other mold is closed based on the clamping operation. Since the fixing pin of the mold can be securely inserted into the periphery of the skin and fixed, unlike the conventional case, the skin holding device is advanced to the mold mating surface of the molding die, and the skin is pressed and fixed to the mold mating surface. This eliminates the need to pierce and fix the pin.

According to a second aspect of the present invention, there is provided an injection molding apparatus for injection-molding a molded article covered with a skin, the apparatus comprising: A skin holding member having a holding groove into which a peripheral portion of the skin is inserted and held is attached to a mating surface of one of the pair of molds to be operated, and a mold of the other mold is formed. The surface is provided with a required number of fixing pins that are inserted into the peripheral portion of the skin through the skin holding member and fix the skin.

Accordingly, a skin holding member is assembled on the mating surface of one molding die, and a required number of fixing pins are protruded from the mating surface of the other molding die. The structure is simple because the fixing pin is inserted into the epidermis and fixed.

According to a third aspect of the present invention, there is provided an injection molding apparatus for a molded article covered with a skin according to the second aspect of the present invention. The one mold on which the skin holding member is assembled is a movable mold, the other mold on which a fixing pin is projected is a fixed mold, and a material flow path is formed in the fixed mold.

Therefore, when a molded article is formed from the molten material injected between the fixed mold and the movable mold through the material flow path of the fixed mold, the surface of the movable mold is formed by the injection of the molten material. Since it is pressed against the mold surface, the molded article made of the molten material is securely bonded to the back surface of the skin without poor bonding.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, which is a perspective view of the injection molding apparatus 20 separated, the movable mold 32 is opened with respect to the fixed mold 22, FIG. 2 is a side view, and FIG. A fixed die 22 is assembled to the board 21, and a mating surface 2 formed on one side surface of the fixed die 22.
A convex surface 24 is formed at the center of 3. The fixed die 22 has one end opening to the convex surface 24 and the other end passing through the rear surface of the fixed die 22 and opening to the fixed platen 21.
5 is formed, and a nozzle 26 leading to an extruder for injection molding is connected to the other end opening of the material flow path 25. A required number of fixing pins 27 protrude from left and right portions of the molding surface 23 of the fixed die 22. In this embodiment, fixing pins 27 are protrudingly provided at a total of six locations, that is, upper and lower and intermediate portions on the left and right portions of the molding surface 23.

The movable mold 32 corresponding to the fixed mold 22 includes:
The movable platen 31 is mounted on the movable platen 31 and moved forward and backward with respect to the fixed platen 21 by a driving device (not shown), whereby the movable die 32 is opened and clamped with respect to the fixed die 22. I have. A molding surface 33 is formed on one side surface of the movable mold 32 so as to face the molding surface 23 of the fixed mold 22, and a concave surface 34 is formed at the center of the molding surface 33. I have.

A skin holding member 41 is mounted on the mating surface 33 of the movable die 32. The skin holding member 4
Reference numeral 1 denotes a substantially U-shaped frame including both side frame portions 47 and a bottom frame portion 48 which form a substantially U-shaped frame along the left, right, and lower portions of the molding surface 33 of the movable mold 32. Are inserted and held in the peripheral edge portion 14 thereof.
have. That is, both side frame portions 47 and the bottom frame portion 48 of the skin holding member 41 are formed in a substantially U-shaped cross section that forms the holding groove 41a, and are fixed to the mating surface 33 of the movable mold 32 with screws or the like. Mounting piece 42, and a protruding piece 43 projecting from one end of the mounting piece 42 at right angles.
And a flange 44 folded back in parallel with the mounting piece 42 with the holding groove 41a separated from the tip of the protruding piece 43.

Insertion holes 45 are formed in the flanges 44 and the mounting pieces 42 of both side frame portions 47 of the skin holding member 41 at positions corresponding to the fixing pins 27, respectively.

Next, the method of injection-molding the molded article 12 covered with the skin 13 together with the operation of the injection molding apparatus 20 having the above-described structure will be described in the order of steps. First, in the skin setting step, as shown in FIGS. 2 and 3, the movable mold 32 is opened with respect to the fixed mold 22, while the skin holding device 53 attached to the tip of the arm 51 of the skin feeding robot is opened. The required number of suction cups 52 enables the skin 13
Is detachably held by suction on the back surface thereof. For the skin 13, a fabric, a synthetic resin sheet, or the like is used.

Here, as shown in FIGS. 4 and 5, the skin holding device 53 is lowered between the movable mold 32 and the fixed mold 22 in the mold open state, and the skin holding device 53 is moved downward. Based on this, the skin 13 is inserted from above the holding grooves 41 a in the side frame portions 47 of the skin holding member 41 on both sides of the peripheral edge portion 14. Thereby, the surface of the skin 13 faces the concave surface 34 of the movable mold 32. When the skin holding device 53 is lowered between the predetermined positions, the lower part of the peripheral portion 14 of the skin 13 is inserted into the holding groove 41a of the bottom frame portion 48 of the skin holding device 53 and held. Both sides of the peripheral portion 14 of the skin 13 are inserted into holding grooves of both side frame portions 47 of the skin holding device 53 and held. Thereafter, after the suction of the epidermis 13 by the suction cup 52 of the epidermis holding device 53 is released, the epidermis holding device 53 is raised to a position where it is separated from between the fixed die 22 and the movable die 32, and returned to the original epidermis suction position. It is.

After the skin setting step, a mold clamping / fixing step is performed. In this mold clamping / setting process, FIG.
7, the movable mold 32 is clamped to the fixed mold 22. Based on the mold clamping operation of the movable mold 32, each fixing pin 27 of the fixed mold 22 is
In this case, the fixing pins 27 are securely inserted into the peripheral portion 14 of the skin 13 from the insertion holes 45 of the flanges 44 of the both-side frame portions 47 to the insertion holes 45 of the mounting pieces 42. The skin 13 is immovably fixed to the member 41.

In this manner, based on the mold clamping operation of the movable mold 32, each fixing pin 27 is securely inserted into the peripheral edge portion 14 of the skin 13, and the skin 13 is immovably fixed to the skin holding member 41. Therefore, unlike the related art shown in FIG. 10, the skin holding device 153 is advanced to the mating surface 133 of the movable mold 132 and the skin 113 is pressed against the mating surface 133 of the movable mold 132, so that the fixing pin is fixed to the skin 113. It is possible to eliminate the necessity of inserting and fixing the outer skin 127, and there is no problem that the reaction force due to the pressing of the outer skin 113 acts on the arm 151 of the outer skin feeding robot and the arm is bent.

After the mold clamping and fixing step, an injection molding step is performed. In this injection molding step, as shown in FIG. 7, a molten material 2 made of a thermoplastic synthetic resin is pressure-fed from a nozzle 26 leading to an extruder for injection molding to a material flow path 25 of a fixed mold 22, and the molten material 2 2 is injected and filled into a cavity formed between the convex surface 24 of the fixed die 22 and the concave surface 34 of the movable die 32, and the filled molten material 2 is cooled and solidified to form a molded product. 12 is molded. The molten material 2 is injected into the cavity to form a molded product 1
When the molten material 2 is molded, the skin 13 is pressed against the concave surface 34 of the movable mold 32 while being stretched by the injection of the molten material 2, so that the molded product 12 is securely bonded to the back surface of the skin 13 without poor bonding. At the same time, the skin 13 does not wrinkle or loose.

Finally, in the demolding step, the movable die 32 is opened with respect to the fixed die 22, and the molded product 12 covered with the skin 13 is demolded. Then, as shown in FIGS. 8A and 8B, an unnecessary portion of the peripheral portion 14 of the skin 13 is cut off, and the peripheral portion 14a left on the skin 13 is folded back on the back surface of the molded product 12. The product 11 such as a trim board is manufactured by being fixed by bonding, ultrasonic welding, tacking or the like.

In the above-described embodiment, a case where one of the pair of molds is the movable mold 32 and the other mold is the fixed mold 22 is illustrated.
2, the convex surface 24 is formed on the fixed die 22 and the concave surface 34 is formed, but the present invention is not limited to this. For example, a convex surface is formed on the movable die 32, and the fixed die 2
2, a movable mold 32 and a fixed mold 2 may be formed.
2 may be respectively formed with a concave surface. Further, a required number of fixing pins 27 are protruded from a molding surface 33 of the movable mold 32, and a skin holding member 41 is formed on the molding surface 23 of the fixed mold 22.
May be assembled. Further, a pair of molding dies may have a structure in which mold opening / clamping operations are performed with each other, and further, a structure in which the mold opening / clamping operations may be performed in a vertical direction.

[0023]

As described above, according to the first aspect of the present invention, unlike the related art, the reaction force due to the pressing of the skin acts on the arm of the robot for feeding the skin and the arm is bent. Can be eliminated, and productivity can be improved. According to the second aspect of the present invention, the structure can be provided simply and at low cost. According to the third aspect of the present invention, it is possible to securely join the molded article to the back surface of the outer skin without defective joint simultaneously with the injection molding of the molded article.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a fixed mold and a movable mold are separated in an injection mold apparatus according to an embodiment of the present invention.

FIG. 2 is a side view showing a state where a movable mold is opened with respect to a fixed mold.

3 is a plan sectional view based on the line III-III of FIG. 2;

FIG. 4 is a side view showing a state in which the skin is inserted into the holding groove of the movable-type skin holding member which is also opened.

5 is a plan sectional view based on the line VV of FIG. 4;

FIG. 6 is a side view showing a state where the movable mold is clamped to the fixed mold and a molded product is injection-molded.

7 is a plan sectional view based on the line VII-VII of FIG. 6; FIG.

FIG. 8 is an explanatory view showing a process in which a molded product covered with a skin is removed from the mold and a product such as a trim board is manufactured.

FIG. 9 is a side view showing a state in which a movable mold is opened with respect to a fixed mold in a conventional injection mold apparatus.

FIG. 10 is a side view showing a state in which the outer skin is pressed against the mating surface of the movable mold that has been opened, and a fixing pin is inserted.

[Explanation of symbols]

 Reference Signs List 11 Product like trim board 12 Molded product 13 Skin 20 Injection mold device 22 Fixed mold (mold) 23 Mold mating surface 25 Material flow path 27 Fixed pin 32 Movable mold (mold) 33 Mold mating surface 41 Skin holding member 41a Holding groove 45 Insert hole 51 Arm of robot for feeding skin 53 Skin holding device

Claims (3)

[Claims] 1. A method for injection-molding a molded product covered with a skin, wherein a skin is formed in a holding groove of a skin holding member provided in one of a pair of molding dies in an open state. A skin setting step of inserting the peripheral portion of the mold and holding the skin, and simultaneously clamping the pair of molds, and simultaneously holding the fixing pin protruding to the other mold based on the mold clamping operation. A mold clamping / fixing step of fixing the skin by piercing the periphery of the skin through a member, and injecting a molten material between the pair of molds in the mold clamped state, cooling and solidifying to mold. At the same time as molding the product,
An injection molding step of integrally joining the molded product to the back surface of the skin, and a method of injection molding a molded product covered with the skin. 2. An injection molding apparatus for injection-molding a molded product covered with a skin, wherein a molding surface of one of a pair of molding dies operated to open and close the mold is provided with: A skin holding member having a holding groove in which the skin is inserted and held at a peripheral portion thereof is assembled, and a mold engaging surface of the other mold is pierced into the peripheral portion of the skin through the skin holding member. An injection molding apparatus for a molded product covered with a skin, wherein a required number of fixing pins for fixing the skin are protruded. 3. The injection molding apparatus for molded articles covered with a skin according to claim 2, wherein one of the pair of molding dies on which the skin holding member is assembled is a movable mold, and the fixing pin is An injection molding die apparatus for a molded article covered with a skin, wherein the other of the projecting dies is a fixed die, and a material flow path is formed in the fixed die.