JPH04216911A - Manufacture of molded form made of elastometric resin - Google Patents

Abstract

PURPOSE:To obtain the method for manufacturing an elastometric resin molded form capable of positively removing a burr formed at the time of molding rapidly by molding the elastometric resin molded form, opening a top force and pushing a cutting edge mold, in which a cutting edge is fitted at a specified position, against the molded form. CONSTITUTION:The pin 22 of a cutting edge mold 16 before a molded form is extracted is positioned and placed concentrically to a bottom force section 2. When the cutting edge mold is pushed downward under the state, cutting edges 17 cut a burr 23. An elastometric resin decorating 24 is acquired by extracting the molded form. Accordingly, there are no cutting-residue and over- cutting of the burr, thus removing the burr to desired size at all times.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an elastic resin molded article such as a foamed resin decorative body which is used for adhesively fixing to the disk surface of an automobile wheel.

0002

[Prior Art] Conventionally, in the above method for manufacturing elastic resin molded products, burrs are generated on the surface of the molded product that is the mating surface of the mold, so rough burrs are removed after the molded product is demolded. In addition, burrs remaining on the outer periphery, central opening, and decorative holes of the molded product were removed manually using a utility knife, heat cutter, microgrinder, etc.

0003

[Problems to be Solved by the Invention] The manual burr removal process in the conventional manufacturing method described above is difficult to perform without skill and requires a large number of man-hours, and there are also many variations in product appearance due to individual differences. Ta. Another option is to press a punching blade onto the demolded product and cut it.
There is also the problem that it is very difficult to finish the product to desired dimensions due to variations in the shrinkage of the elastic resin.

The present invention was made to solve the above-mentioned problems of the prior art, and its purpose is to provide a method that can reliably and quickly remove burrs that are formed during molding of elastic resin molded products. This is what we are trying to provide.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the method of manufacturing an elastic resin molded product according to the present invention includes filling a mold consisting of an upper mold and a lower mold with a resin material to make the molded product elastic. After a resin molded product is molded, the upper die is opened, and a punching die provided with a punching blade at a predetermined position is pressed against the molded product to remove burrs.

[0006]

[Operation] The molded product that has been molded retains its dimensions until it is demolded, and by pressing a punching die with a punching blade in a predetermined position in this state, the molded product can be burred. There is no uncut or excessive cut, and burrs can always be removed to the desired dimensions.

[0007]

[Embodiment] An embodiment of the method for manufacturing an elastic resin molded article according to the present invention will be described with reference to the drawings. 1 and 2 show an apparatus 1 for producing an elastic resin decorative body that is adhesively fixed to the surface of an automobile wheel. The manufacturing apparatus 1 consists of a lower mold part 2 and an upper mold part 3. The lower mold part 2 has a lower mold part surface 4 that gives a decorative shape to the decorative object, and the upper mold part 3 has a surface 4 of a disc of an automobile wheel. An upper mold part surface 5 is formed which gives the same shape as the outer side of the inner slope of the hat part. The lower mold part 2 and the upper mold part 3 are connected by a hinge 6 and can be opened and closed, and the upper mold part is provided with a resin material injection port 7 and an air vent hole 8.

Furthermore, a block 10 is provided on the upper surface of the upper mold part 3 for fixing a plug 9 that is filled into the resin material injection port 7 after the resin material is injected. It is fixed by aligning it with the lower surface of the block 10. In addition, the lower mold part 2 has a clamp 13 on the side surface that grips and fixes the upper mold part in the mold closed state.
4 is placed. Furthermore, as shown in FIGS. 3 and 4, the upper mold part 3 and the lower mold part 2 are provided with a liquid circulation path 15 for circulating heated liquid such as water or oil in order to speed up the molding of the molded product. ing.

As shown in FIG. 5, the cutting blade die 16 consists of a cutting blade 17 provided at the same position as the outer periphery or opening of the decorative object, and a base part 18 that holds the cutting blade 17. A handle 19 is provided on the side surface to facilitate handling. In addition, the lower mold part surface 4 and the punching blade mold lower surface 2
0, a bush 21 and a pin 22 for positioning are buried respectively. Note that an electric heater may be embedded in the base portion 18 of the punching die 16 to meet conditions such as hardness, thickness, cutting length, etc. of the material to be cut.

Next, a method for manufacturing an elastic resin molded article according to the present invention will be explained. Using the manufacturing apparatus shown in FIGS. 1 to 5, first, the upper mold part surface 5 and the lower mold part surface 4 are formed in the open state of the mold.
Apply mold release agent to. Next, close the upper and lower molds and clamp 1
3, and after injecting the foamed resin material from the resin material injection port 7, the stopper 9 is fixed. After a certain period of time has passed in this state and the resin material has completely hardened, the clamp 13 is released and the upper mold is opened.

As shown in FIG. 5, when the pin 22 of the punching die 16 is inserted into the bushing 21 of the lower die part 2 before taking out the molded product, the cutting die 16 is positioned concentrically with the lower die part 2. It will be placed. When the punching blade die 16 is pressed downward in this state, the punching blade 17 cuts the burr 23. Thereafter, by taking out the molded product, an elastic resin decorative body 24 as shown in FIG. 6 is obtained.

0012

[Effects of the Invention] Since the method for manufacturing an elastic resin molded product of the present invention has the above-mentioned configuration, the work can be performed very easily and quickly, and deburring work, which was conventionally done in a separate process. Since this can be omitted, the number of man-hours can be significantly reduced. In addition, since deburring is performed before demolding, the molded product can always be reliably finished to the desired dimensions, resulting in an excellent appearance quality of the product and the ability to maintain stable quality. It is something that you have.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram in an open state of a manufacturing apparatus used in the method of manufacturing an elastic resin molded article of the present invention.

FIG. 2 is an explanatory diagram of the device in a closed state.

FIG. 3 is an explanatory diagram of a liquid circulation path provided in the lower mold part used in the present invention.

FIG. 4 is an explanatory diagram of a liquid circulation path provided in the upper mold part.

FIG. 5 is an explanatory diagram of the state in which the punching blade die is used.

FIG. 6 is a sectional view of an elastic resin decorative body.

[Explanation of symbols]

1 Manufacturing equipment 2 Lower mold part 3 Upper mold part 6 Hinge 7 Resin material injection port 8 Air vent hole 9 Stopper 11 Handle 13 Clamp 14 Damper 15 Liquid circulation path 16 Cutting blade type 17 Cutting blade 21 Bush 22 pin 23 Bali 24 Elastic resin decorative body

Claims (1)

[Claims] Claim 1: A punching blade, which is formed by filling a mold consisting of an upper mold and a lower mold with a resin material to mold an elastic resin molded product, and then opening the upper mold and providing a punching blade at a predetermined position. A method for manufacturing an elastic resin molded product, characterized in that burrs are removed by pressing a mold against the molded product.