JPH0454568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention aims to improve hangers and the like (including clip pangers) having a hook part, and in particular, to prevent undercuts (impossible to release) during mold release of the hook part. Regarding improvement of shape) processing.

[Prior art]

Conventionally, for example, in manufacturing the clip hanger shown in FIG. 1, the hook part b is laid down on the plane of the mold c shown in FIGS. 2 and 3, and the main body holding piece part a is used to form two holding pieces. It was formed by pulling it out using sliding pieces d and e. However, such an arrangement results in each clip hanger requiring a significant amount of real estate on the mold surface.

As a result, the number of products produced per unit area of mold c was small, making it impossible to reduce the unit price of the clip hanger.

[Purpose of the invention]

The present invention aims to eliminate these drawbacks of the prior art, and its purpose is to provide a hook part that can significantly increase the number of moldings per unit area of the mold and significantly reduce the unit cost of molding and processing the hanger. An object of the present invention is to provide a method for manufacturing a hanger, etc., having the following.

[Structure of the invention]

The present invention provides a method for manufacturing a generally flat molded product, such as a hanger having a hook portion, in multiple pieces by pouring a material into molding grooves provided on dividing surfaces of upper and lower molds. A plurality of molding grooves are formed in parallel in the upper and lower molds so that the flat direction of the molded product is perpendicular to the dividing plane of the upper and lower molds, and each of the hook portions is The entire shape of the hook part,
Or grooves that fit a part of the part are carved on one side and are arranged in a direction parallel to the mold dividing surface, so that each groove can move within the sliding space in a direction perpendicular to the flattening direction of the drawn product. Molding is performed using a plurality of sliding cores that are formed and are always urged by compression springs to separate from the hook molding surface, and after molding, the upper mold and the lower mold are vertically moved. When the sliding cores are opened, the compressed springs are released in the sliding space of each sliding core by releasing the pressure contact between the inclined shoulders formed on each sliding core and the inclined surface formed on the upper mold. This method of manufacturing a hanger or the like having a hook portion is characterized in that the molded surface of each sliding core is retracted by the vertical wall of the mold by movement due to the restoring force of the mold, and the molded product is taken out.

[Effect]

In the present invention, by arranging the molding grooves on the mold vertically without laying the hook part flat, the number of products to be produced can be increased with the same mold area. The undercutting of the hook portion is carried out using a sliding core with a groove carved into one end face that fits the entire hook shape or a portion thereof.

After molding, the upper and lower molds are released, the carved surface of the sliding core is retracted, the hook is released, and the product is taken out.

〔Example〕

Hereinafter, the present invention will be specifically explained based on examples based on the accompanying drawings.

The manufacturing method of this example will be explained using FIGS. 4 to 6. In addition, Fig. 4 is a plan view with the upper mold removed, Fig. 5 is a cross-sectional view taken along the line of Fig. 4 (including the upper mold), and Fig. 6 is a cross-sectional view taken along the line of Fig. 4. Figure (including the upper mold).

In the figure, 1 is an upper mold that engages with the lower mold 2 in a freely movable manner and forms a dividing surface 6, 3 is a sprue perpendicularly drilled in the center of the upper mold 1, and 4 is a sprue 3. 5 is a product part sprue that connects the product forming part 8 and the runner 4, and 7 is a product formed in the product forming part 8 in the mold. It is an extrusion pin that releases the mold to the outside.

Further, reference numeral 9 indicates a plurality of sliding spaces provided symmetrically along the center line of the runner 4 of the lower mold 2, and reference numeral 10 indicates a plurality of sliding spaces 9 with inclined shoulders 10a facing each other. , and a hook forming sliding core 11 which is attached so as to be movable in mutually opposite directions in the longitudinal direction and has a hook forming portion 8a on the vertical surface opposite to the inclined shoulder portion 10a; A compression spring 12 constantly applies an elastic force to the molds 1 and 2 in a direction away from the corresponding vertical walls 1a and 2a; 12 is the upper mold 1;
is provided on the dividing surface 6 of the pair of hook-forming cores 10 in each sliding space 9, and is fitted between the inclined shoulders 10a of the pair of hook-forming cores 10 and engages with the inclined shoulders 10a to form both hook-forming cores. 10 in the longitudinal direction of the vertical wall 2a of the lower mold 2
The trapezoidal protrusions 13 and 14 that move toward the upper mold 1 and the lower mold 2 are clip forming portions provided in a direction perpendicular to the dividing plane 6 of the upper mold 1 and the lower mold 2.

Regarding the other components of the mold having the above configuration, 20 and 21 are upper and lower mounting plates to the molding machine (not shown), 22 and 23 are the lower mold parts below the lower mold 2. 2 is an ejector plate that is attached to move forward and backward toward 2 and fixes the ejector pin 7; 24 is a plate guide rod that connects both ends to the bottom surface of the lower mold 2 and the top surface of the lower mounting plate 21; 25 is the plate guide A spring attached to the rod 24, 26 a spacer block, 27 an ejector rod that comes into contact with the lower surface of the ejector plate 23 and moves the ejector pin 7, and 28 a through hole for inserting the ejector rod provided on the lower mounting plate 21. be.

Note that the mechanism for operating the ejector pin 7 is a well-known technique and does not constitute the present invention.

Next, we will describe the procedure for molding the clip hanger using a mold using the above configuration.
From there, it passes through the runner 4, passes through the sprue 5 of each product section, and is injected into the product forming section 8. After that, the molds 1 and 2 are cooled and hardened in the same mold, and the upper mold 1 and the lower mold 2 are opened in a direction perpendicular to the dividing surface 6 with the dividing surface 6 as a reference. is released from the mold.

In forming the product forming part 8, if there is no undercut shape in the direction perpendicular to the dividing surface 6, there will be a problem when releasing the product, but in order to make it possible to take out a large number of pieces, the hook part and the clamping piece are the same. In the clip hanger which is the subject of the present invention and has a flat orientation,
The shaded area B shown in FIG. 7 becomes an undercut, and it is impossible to release the mold as it is. This is because the opening direction of the upper mold 1 is indicated by the arrow X, and the hook forming portion 8a is carved into the sliding core 10. In addition, in FIG. 7, 30 is a compression spring mounting hole.

Therefore, in the embodiment of the present invention, as the upper mold 1 rises, the entire sliding core 10 is moved in a direction away from the vertical walls 1a and 2a by the compression spring 11, thereby preventing the undercut. Processing can be performed effectively and products can be released smoothly.

In the above embodiment, the entire hook part shape is carved into the sliding core 10, but the outer periphery of the hook part is formed in the upper mold, and the part corresponding to the inner periphery of the hook part is carved. Of course, the sliding core may be engraved.

〔Effect of the invention〕

In the conventional technology, in order to increase the number of products per unit area of the mold, it was necessary to increase the size of the mold, but in the present invention, for the same area of the conventional mold, It is possible to produce 4 to 6 times as many products, and since it is integrally molded, an assembly process can be eliminated. Accordingly, the productivity of clip hangers can be significantly improved, and the unit price can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a clip hanger made using a conventional mold, Fig. 2 is a plan view of the same mold, Fig. 3 is a sectional view taken along the line of Fig. 2, and Fig. 4 is the invention according to the present invention. FIG. 5 is a plan view of the mold (lower mold only) used in the manufacturing method of the embodiment, FIG. 5 is a cross-sectional view taken along the line of FIG. 4 (including the upper mold), and FIG. FIG. 7 is a cross-sectional view taken along the line (including the upper mold) and a perspective view of a sliding core for forming a hook used in the same manufacturing method. In the figure, 1: upper mold, 1a: vertical wall, 2: lower mold, 2a: vertical wall, 3: sprue, 4: runner, 5:
Product part sprue, 6: dividing surface, 7: extrusion pin, 8: product forming part, 8a: hook forming part, 9: sliding space part, 10: sliding core for hook forming, 10a: inclined shoulder part, 11 : Compression spring, 12: Trapezoidal projection, 13:
Clip forming part, 14: Clip forming part, 15:
Connecting rod, 16: Key, 20: Upper mounting plate, 21:
Lower mounting plate, 22: Ejector plate, 23:
Ejector plate, 24: Plate guide rod, 2
5: Spring, 26: Spacer block, 2
7: Extruded rod, 28: Through hole, 30: Compression spring mounting hole.

Claims (1)

[Scope of Claims] 1. A generally flat molded product such as a hanger having a hook portion can be molded into a large number of pieces by pouring the material into molding grooves provided in the dividing surfaces 6 of the upper and lower molds 1 and 2. In the method of manufacturing by molding, forming grooves are formed in the upper and lower molds 1 and 2 so that the flat direction of the molded product is perpendicular to the dividing surface 6 of the upper and lower molds 1 and 2. A plurality of hooks are formed in parallel, and each of the hooks is carved with a groove on one side that matches the whole or a part of the shape of the hook, and the grooves are arranged in a direction parallel to the mold dividing surface 6, A plurality of sliding slides, each of which is movable within the sliding space 9 in a direction orthogonal to the flat direction of the molded product, and which is always biased by a compression spring 11 so as to move away from the hook molding surface. Molding is performed using the sliding core 10. After molding, the upper mold 1 and the lower mold 2 are opened vertically, and the inclined shoulders 10a formed on each sliding core 10 and the upper mold are opened. Each sliding core 10 is moved by the restoring force of the compression spring 11 in the sliding space 9 due to the release of the pressure contact state with the inclined surface formed in the sliding core 1.
1. A method for manufacturing a hanger or the like having a hook portion, characterized in that the molded product is taken out by retracting the die-engraved surface of the mold from the vertical wall of the mold.