JPH0420589Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a mold for integrally molding another molded product into a previously molded product in a mold.

<<Prior Art>> For example, in an automobile lamp, as shown in Fig. 3, a protector b is attached to a rim a attached to the outer periphery of the lamp in order to close the gap between the lamp and the vehicle body mounting opening.
may be integrally formed. This type of molding is generally referred to as a two-color molding method, and as shown in Figure 4, a pre-formed rim a is placed in a female mold c, and a male mold d is placed over it. The protector b is integrally molded by injecting molten resin or rubber into the cavity e.

[Problems to be solved by the invention] Molding the protector b using such a two-color molding method has the advantage of saving the trouble of joining the protector b to the rim a in a later process.
When setting the rim a, a gap may occur around it due to variations in the quantity of the rim a, variations in product dimensions, twisting, warping, etc. If such a gap occurs on the parting surface f or pressing surface g, which is the external boundary surface between the rim a and the protector b, when the protector b is molded, burrs will be generated in the gap area, impairing the appearance quality. It is necessary to remove this burr from the product.

Therefore, an object of this invention is to provide a molding die that prevents the occurrence of burrs on the parting surface of a double-layered product.

<Means for solving the problem> The molding die according to this invention uses a heat-resistant elastic material for the mold part in which the pre-molded first molded product is set, which has a recess slightly smaller than the size of the molded product. and when the first molded product is set in the recess, the first molded product is in close contact with the inner wall surface of the recess.

<<Function>> The mold part in which the first molded product is set is made of a heat-resistant elastic material that has a recess slightly smaller than the size of this molded product, so when the first molded product is set, its periphery will fit inside the recess. Since it is in close contact with the wall surface, no burrs are generated on the parting surface when the second molded product is molded.

<<Example>> FIG. 1 shows an example of this invention. This mold consists of an upper mold 1 and a lower mold 2, and the lower mold 2 accommodates and fixes a core 5, which has a recess 4 formed on its upper surface to receive a rim 3, which is a first molded product. . Further, a recess 8 is formed on the lower surface of the upper mold 1 and serves as a cavity 7 for a protector 6, which is a second molded product, together with the core 5.

The upper mold 1 and the lower mold 2 are made of a metal material such as iron, aluminum, or a copper alloy, and the core 5 is made of a heat-resistant elastic material such as silicone rubber or tetrafluoride rubber.

The recess 4 formed in the core 5 is formed to have a size slightly smaller than the shape of the molded rim 3. Therefore, when the rim 3 is set in the recess 4, the surface of the rim 3 comes into close contact with the inner wall surface of the recess 4, so when the protector 6 is formed by injecting molten resin or rubber into the cavity 7, There are no burrs on the parting surface 9.

In another embodiment of this invention shown in FIG. 2, in addition to the lower die 2 and core 5 as described above,
Another core 11 is housed and fixed on the lower surface of the upper mold 1, forming a cavity 7 together with the core 5 and having recesses 8 and 10 for pressing the rim 3. The size of the recess 10 of this core 11 is also formed to be slightly smaller than the size of the rim 3 in this part, so when the upper mold 1 is closed, the recess 10 is formed on the rim 3.
Since it is in close contact with the surface of the protector 6, there will be no burrs on the pressing surface 12 when the protector 6 is molded.

《Effects of the invention》 As mentioned above, the molding mold according to this invention has the following effects:
Since the mold part in which the pre-formed first molded product is set is made of a heat-resistant elastic material having a recess slightly smaller than the size of the molded product, the molded product can be set in close contact with the recess. This first
When the second molded product is integrally molded with the molded product, it is possible to prevent the occurrence of burrs on the parting surface and the pressing surface.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing an example of a molding die according to this invention, Fig. 2 is a schematic sectional view showing another embodiment of this invention, and Fig. 3 is an example of a two-color molded product. The perspective view shown in FIG. 4 is a schematic cross-sectional view of a mold for molding the molded product. 1... Upper mold, 2... Lower mold, 3... Rim (first molded product), 4... Recess, 5... Core (heat-resistant elastic material), 6... Protector (second molded product) ,7...
Cavity, 8... recess, 9... parting surface.

Claims (1)

[Scope of utility model registration request] A mold for integrally forming a second molded product on the first molded product by setting a pre-molded first molded product in a recess in the mold, the mold for forming a second molded product integrally with the first molded product, wherein the recess is set in a recess in the mold. The first molded product is made of a heat-resistant elastic material having a recess slightly smaller than the size of the product, and when the first molded product is set in the recess, the first molded product is in close contact with the inner wall surface of the recess. Characteristic molding mold.