JP2554633Y2 - Injection molding equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an injection molding apparatus.

[0002]

2. Description of the Related Art An injection molding apparatus is disclosed in Japanese Patent Application Laid-Open No. 2-41.
As shown in Japanese Patent Publication No. 221, an injection molding of a second molded material with respect to a first molded product formed in advance by a first molded material is performed to form a first molded product and a second molded product. 2. Description of the Related Art Molding a heavy molded product is known. An example of such a double molded product is injection molding of a molding resin made of vinyl chloride or the like on the surface of a core material made of a hard plastic or the like in order to impart rigidity and surface softness to the molded product. There is known a material in which a skin is formed on the surface of a core material.

[0003] By the way, in such a double molded product in which the skin is formed on the surface of the core material, an opening is formed in the double molded product due to a request to incorporate other parts into the double molded product. In some cases, an opening needs to be formed in the core in advance.

[0004]

However, when the size of the opening provided in the core is large, the rigidity around the opening is insufficient, so that the core is easily deformed. If the core material is deformed, the core material will deviate from the regular position in the cavity when filling the skin molding resin, so the thickness of the skin formed on the surface of the core material will not be constant, There are inconveniences such as the softness of the surface varies depending on the site, and the core material is exposed on the surface.

Therefore, the present inventor has considered that a reinforcing beam is erected at the opening of the core to improve the rigidity of the periphery of the opening, thereby preventing deformation of the core.

However, when a reinforcing beam is erected in the opening,
Since the reinforcing beam at the opening must be removed after the double molded product is formed, a new problem has arisen that a device for removing the reinforcing beam is required.

Further, when molding a double molded product, it is necessary to position the core material by sandwiching it between the cavities, and there has been a problem that traces of positioning remain on the surface of the double molded product.

In view of the above, the present invention provides an apparatus for reliably positioning a core material in a cavity without leaving a positioning mark of the core material on a molded product, and for removing a reinforcing beam provided at an opening of the core material. It is an object of the present invention to provide an injection molding apparatus that does not require any.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method in which one of molds forming a cavity is advanced into an opening of a core material housed in the cavity. A slidable die is provided, and the slidable die is advanced into the above-mentioned opening, thereby cutting a reinforcing beam spanning the opening.

Specifically, a solution taken by the present invention is an injection molding apparatus for injection molding a skin on the surface of a core material having an opening penetrating the front and back surfaces and a reinforcing beam spanning the opening. A pair of molding dies for accommodating the core material and forming a cavity filled with the skin molding resin, and an opening of the core material housed in the cavity in each of the pair of molding dies. And a through hole formed so as to open at a portion opposite to the above, and slidably provided in each of the through holes, and both positions the core by sandwiching the reinforcing beam of the core from the front and back. A pair of slide dies, and one of the slide dies is moved into the opening of the core material and cooperates with an opening end peripheral wall of a through hole provided with the other slide dies. Work to cut the reinforcing beam of the above core material And it constitutes sea urchin.

[0011]

According to the above construction, since the reinforcing beam is provided at the opening of the core material, the rigidity around the opening of the core material is improved and the deformation of the core material is prevented. The displacement of the core material at the time of filling is reduced.

In each of the pair of molds, a through-hole is formed which opens at a portion facing the opening of the core, and is slidably provided in each through-hole. Since there is a pair of slide dies for positioning the core material by sandwiching the core material from the front and back, there is no need to provide a positioning pin for positioning the core material with respect to the molding die on the core material or the molding die. In addition, the appearance of the product is not impaired by the trace of the positioning pin.

Further, in the pair of slide dies, one of the slide dies advances into the opening of the core material and cooperates with the peripheral wall of the through hole of the other slide type to cut the reinforcing beam of the core material. Therefore, it is not necessary to separately provide a device for cutting the reinforcing beam at the opening.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows a pull handle A for a vehicle as an injection molded product formed by an injection molding apparatus according to one embodiment of the present invention. In FIG. 3, reference numeral 10 denotes a skin constituting the pull handle A for a vehicle. , 12 is an opening for an opening / closing knob for opening and closing the door, 13 is a handle, 14 is an opening forming the handle 13, and 16 is for attaching the vehicle pull handle A to a vehicle door (not shown). Mounting holes.

FIG. 4 shows a core 18 constituting the pull handle A for a vehicle. In FIG.
Reference numeral 24 denotes a reinforcing beam for reinforcing the core 18, reference numeral 24 denotes a rib for reinforcing the core 18, and reference numeral 26 denotes a resin intrusion hole for improving a bonding force between the core 18 and the skin 10.

FIG. 1 shows a sectional structure of the injection molding apparatus. In FIG. 1, reference numeral 28 denotes a fixed mold, and 30 denotes a movable mold.
A pair of molding dies 32 are formed to form the cavity 31 that accommodates the molding resin 8 and is filled with the molding resin constituting the skin 10.

As a feature of this embodiment, the fixed mold 28 includes:
A fixed through hole 34 is formed at the cavity surface 28a of the fixed die 28 at a position facing the opening / closing knob opening 12 of the core 18, and the fixed through hole 34 is formed.
Is composed of a large-diameter large-diameter portion 34a having the same cross section as the opening / closing knob opening 12, and a small-diameter portion 34b smaller than the large-diameter portion 34a. The movable mold 30 has a movable mold through-hole 36 formed at a portion of the cavity surface 30a of the movable mold 30 opposite to the opening / closing knob opening 12 of the core 18. Reference numeral 36 denotes a small-diameter portion 36a having a cross section having the same shape as the opening / closing knob opening 12, and a large-diameter portion 36b having a diameter larger than the small-diameter portion 36a.

Inside the large-diameter portion 34a of the fixed-type through-hole 34, a fixed-type slide die 38 slidable with respect to the peripheral wall surface of the large-diameter portion 34a of the fixed-type through-hole 34 is provided. ing. The stationary mold slide die 38 is configured to be movable in the axial direction inside the stationary mold through hole 34 by a hydraulic cylinder (not shown), and the inside of the cavity 31 and the movable mold through hole 36 is operated by the operation of the hydraulic cylinder. Can be entered. And, the slide die 38 for the fixed die is provided with the tip end surface 3.
8a at a position facing the cavity surface 28a of the fixed mold 28, the large-diameter portion 34a and the small-diameter portion 3
4b and the fixed portion 2c.
8 is restricted in the retreating direction.

Inside the movable through hole 36, there is provided a movable slide die 40 which can slide on the peripheral wall surfaces of the small diameter portion 36a and the large diameter portion 36b of the movable through hole 36. The movable mold 40 is urged toward the fixed mold 28 by urging means (not shown). A groove 40b into which the reinforcing beam 20 of the core 18 is fitted is formed in the distal end surface 40a of the movable mold 40. Then, the distal end surface 40a of the movable type slide die 40
The movable mold slide mold 40 is formed between the small-diameter portion 36a and the large-diameter portion 36b of the movable mold through-hole 36 at a position where the. It is configured so as to be in contact with the step portion 36c and to prevent entry into the fixed type through hole 34.

Since the injection molding apparatus according to this embodiment is configured as described above, the molding of the vehicle pull handle A is performed as follows. First, the core 18 is moved to the movable mold 3 with the movable mold slide mold 40 of the movable mold 30 advanced.
0 side, and the distal end surface 38 of the fixed die slide die 38
The mold is clamped by sliding the movable mold 30 with the “a” facing the cavity surface 28 a of the fixed mold 28. As a result, as shown in FIG.
0 is a groove 40b formed on the distal end surface 38a of the stationary slide die 38 and the distal end surface 40a of the movable slide die 40.
And is positioned at a predetermined position in the cavity 31. Next, the cavity molding resin is filled into the cavity 31 to form a double molded product in which the skin 10 and the core material 18 are integrated.

Further, as shown in FIG. 2, the hydraulic cylinder is operated to move the fixed mold slide mold 38 into the cavity 31.
When the movable beam penetrates into the movable through-hole 36 through the opening, the opening / closing knob reinforcing beam 20 is pressed by the fixed-type slide die 38 and the peripheral wall surface of the small-diameter portion 36 a of the movable-type through hole 36. The pull handle A for a vehicle, which is cut and has the opening 12 for the opening / closing knob, is obtained.

[0023]

As described above, according to the injection molding apparatus of the present invention, a skin is formed by injection molding a skin molding resin on a core material having a reinforcing beam erected in an opening. Therefore, the rigidity around the opening of the core material is improved by the reinforcing beam to prevent the deformation of the core material, and further, the core material is securely positioned in the cavity with the reinforcing beam interposed therebetween, As a result, the displacement of the core material during filling of the resin for forming the skin is reduced, so that the thickness of the skin becomes highly accurate.

In each of the pair of forming dies, a through hole is formed which opens at a portion facing the opening of the core material, and a reinforcing beam of the core material is provided slidably in each through hole. Since a pair of slide dies for positioning the core material by being sandwiched from the front and back are provided, there is no need to provide a pin for positioning the core material with respect to the molding die on the core material or the molding die. No trace is left, and the aesthetic appearance of the obtained molded article is improved.

Further, the pair of slide dies is configured such that one of the slide dies advances into the opening of the core and cooperates with the peripheral wall of the through hole provided with the other slide to reinforce the core. Since the beam can be cut, there is no need to separately provide a device for cutting the reinforcing beam at the opening.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a state in which a slide die of an injection molding apparatus according to an embodiment of the present invention sandwiches a reinforcing beam of a core material.

FIG. 2 is a cross-sectional view showing a state where a slide die of the injection molding apparatus cuts a reinforcing beam of a core material.

FIG. 3 is a front view of an automobile pull handle formed by the injection molding apparatus.

FIG. 4 is a front view of a core material used for molding by the injection molding apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Skin 12 ... Opening / closing knob opening part (opening part) 18 ... Core material 20 ... Opening / closing knob reinforcing beam (reinforcement beam) 28 ... Fixed type 30 ... Movable type 31 ... Cavity 32 ... Pair of forming dies 34 ... Fixed type Through hole 36 for movable type 38 Through hole for movable type 38 ... Slide type for fixed type 40 ... Slide type for movable type

Claims (1)

(57) [Scope of request for utility model registration] 1. An injection molding apparatus for injection-molding a skin on a surface of a core material having an opening penetrating through the front and back surfaces and a reinforcing beam provided in the opening, wherein the core material is housed. A pair of molding dies forming a cavity filled with the skin molding resin, and formed in each of the pair of molding dies so as to open at a portion facing the opening of the core material housed in the cavity. And a pair of slide molds slidably provided in each of the through holes, both of which hold the reinforcing beam of the core material from the front and back to position the core material. In the slide type, one of the slide types advances into the opening of the core material and cooperates with the opening end peripheral wall of the through hole provided with the other slide type to form the reinforcing beam of the core material. Characterized in that it is configured to cut That the injection molding apparatus.