JPH0454569B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in the manufacturing method of hangers, etc. (including clip hangers) having hook portions, and in particular to improvements in the undercut treatment of the hook portion during mold release. Regarding improvements.

[Prior art]

Conventionally, hangers and the like having hooks have been molded by molding the hanger body and the hook separately, or by integrally molding the hanger with the hook lying on the plane of the mold.

The former method is shown in FIGS. 1 to 3. That is, in this method, the clip hanger is composed of a clip body a and a hook part b, and as shown in FIGS.
As shown in the figure, they are arranged and molded on a mold c.
However, in this method, the number of products produced per unit area of the mold is small, the molding area of the mold c is not effectively utilized, and assembly is required after molding. Therefore, it has not been possible to reduce the unit price of the clip hanger.

The latter method is also shown in FIGS. 4 to 6. In the figure, d is the upper mold, e is the lower mold,
f is the sprue, g is the runner, h is the product part sprue, i is the dividing surface, j is the extrusion pin, k is the product, k ₁ is the hook forming part, k ₂ is the clamping piece forming part, k ₃ is the tip, l , m is the sliding core for forming the clamping piece, n is the inclined cam, o is the upper mounting plate, p is the lower mounting plate, q, r are the ejector plates, s is the plate guide rod, t is the spring, and u is the spacer. The block, v is an extrusion rod, and w is a through hole. As shown in the figure, the hook portion is molded by lying on the plane e of the lower mold. Due to restrictions on the use of this clip,
Clip body a and hook part b are in the same direction (parallel)
Therefore, the conventional mold arrangement is
As shown in FIG. 6, the hook forming part k ₁ and the clamping piece forming part k ₂ are laid flat on the surface e of the lower mold, and two clamping pieces are formed from the clamping part forming part k _2. By pulling out the sliding cores l and m, the product k
was released from the mold. This limits the number of products that can be produced per unit area of the mold, making it impossible to effectively utilize the molding area of the mold, and similarly 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 the main body of the molded product is formed. the upper and lower molds;
Molding is performed using a sliding core for forming the main body part that is parallel to the dividing plane of the upper mold and the lower mold and movable in the same direction as the flattening direction of the molded product, and each of the hook parts A plurality of sliding cores for forming hooks having a shape compatible with the hook portion, arranged in a direction parallel to the mold dividing plane, and movable in a direction perpendicular to the flattening direction of the molded product. After molding, the upper mold and the lower mold are opened in the vertical direction, and the sliding core for forming the main body part is slid by an inclined cam provided in the upper mold, and at the same time each of the above molds is opened. By sliding the connecting rod connecting the hook-forming sliding cores using an inclined cam provided in the upper mold, each hook-forming sliding core is retracted from the hook part, and the formed product is removed. This is a method of manufacturing a hanger or the like having a hook portion, which is characterized by taking out a hook portion.

[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. Since the main body of the molded product usually has a portion that becomes an undercut with respect to the upper and lower molds, this is formed using a sliding core for forming the main body. Since the hook portion is further undercut (double undercut) in the mold release direction of this sliding core for forming the main body portion, the hook portion is formed with a plurality of other sliding cores for hook formation. .

After molding, the upper and lower molds are released, and the sliding core for forming the main body and the sliding core for forming the hook are slid in mutually different directions to take out the product.

〔Example〕

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

First Example (FIGS. 7 to 9) The manufacturing method of this example will be explained using FIGS. 7 to 9. In addition, FIG. 7 is a plan view of the lower mold with the upper mold removed, and FIG. 8 is a plan view of the lower mold with the upper mold removed.
A cross-sectional view drawn by a line (including the upper mold),
FIG. 9 is a sectional view taken along the line of FIG. 7 (also 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 vertically drilled in the center of the upper mold 1, and 4 is a sprue of the sprue 3. A runner 5 extends in the longitudinal direction of the mold along the dividing surface 6 from the lower end, a product part sprue 5 connects the product forming part 8 formed on the dividing surface 6 and the runner 4, and 7 a molded part formed in the product forming part 8. This is an extrusion pin that releases the product from the mold.

In addition, reference numeral 9 denotes a core for forming a clamping piece, which is provided on both sides of the mold so as to be slidable in the lateral direction in order to form the clamping piece forming portion 8b, and numeral 10 designates an inclined cam for operating the core 9. , 11 is the central part of the metal piece for forming the hook forming portion 8a, and is attached to a hook forming sliding core slidably in the longitudinal direction; 12 is a hook forming sliding core that integrally connects the sliding core 11 with a key. 13 is a connecting rod that is attached and connected; 14 is a space that ensures longitudinal movement of the sliding core 11; 15 is a hook-forming sliding core that is connected to one end of the connecting rod 12; 16 is a sliding core. This is an inclined cam that slides the connecting rod 12 and other sliding cores 11 together with the moving core 15.

Regarding the other components of the mold having the above configuration, 30 and 31 are upper and lower mounting plates to the molding machine (not shown), 32 and 33 are the lower mold parts below the lower mold 2. 2, an ejector plate that is attached to move forward and backward toward 2 and fixes the extrusion pin 7; 34, 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 31; 35, the plate guide; A spring is attached to the rod 34, 36 is a spacer block, 37 is an extrusion rod that comes into contact with the lower surface of the ejector plate 33 and moves the extrusion pin 7, and 38 is a through hole provided in the lower mounting plate 31.

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

Next, the procedure for molding a clip hanger using the mold having the above configuration will be described. The molten resin passes through the sprue 3, the runner 4, the sprue 5 of each product section, and is injected into the product forming section 8. after that,
After being cooled and hardened in the same mold, 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. It will be released from the mold. Note that if there is no undercut in the shape of the product forming part 8 in the direction perpendicular to the dividing surface 6, there will be no problem when releasing the product, but the hook forming part 8a of the clip hanger product part in this embodiment The holding piece forming portion 8b becomes undercut and cannot be released from the mold as it is.

Therefore, in the present invention, in order to remove the hook forming portion 8a, the hook forming sliding core 11 is attached to the connecting rod 1.
2, and by sliding together, it is possible to perform undercut treatment. That is, as shown in FIGS. 8 and 9, each of the hook forming sliding cores 11 corresponding to the number of products is connected to a connecting rod 12 with a key 13, and the connecting rod 12 is connected to the tip of the hook forming part 8a. 8c is placed in the place where it is dodged when releasing the mold. With this configuration, when the upper mold 1 is opened, the inclined cam 16 integrated with the upper mold 1 operates in a direction perpendicular to the dividing surface 6, and moves the hook-forming sliding core 15 parallel to the dividing surface 6. operate in the direction. As a result, the hook-forming sliding cores 11 connected to the connecting rods 12 move by the space 14, so that the hook-forming portions 8a move into the hook-forming sliding cores 11.
The mold is released from 1. Next, regarding the removal of the clamping piece forming portion 8b, when the upper mold 1 is separated from the lower mold 2, the inclined cam 16 is integrally formed with the mold 1.
Also separate. However, since the inclined cam 16 is provided in the penetrating hole provided diagonally in the holding piece forming core 9, movement of the inclined piece forming core 9 in the direction perpendicular to the dividing surface 6 is caused by the movement of the holding piece forming core 9. A horizontal component force is applied, whereby the core 9 moves outward along the dividing surface 6, and the engagement between the core 9 and the clamping piece forming portion 8b is released. The released product forming portion 8 is completely removed from the mold by the extrusion pin 7 in the next molding operation step, and the molding is completed.

Second Embodiment (FIGS. 10 to 12) This embodiment is used to manufacture a clip hanger having the shape shown in FIG. 4.

As shown, the clip hanger shown in FIG. 4 is composed of a main body holding piece a and a hook b.

In this embodiment, as in the first embodiment, the hooks of the products are arranged perpendicular to the plane of the mold to effectively utilize the number of products per unit area of the mold.

The mold of this example is shown in Figures 10, 11, and 12.
As shown in the figure. Note that FIG. 10 is a plan view of the lower mold 2, and FIGS. 11 and 12 are cross-sectional views of the upper mold 1 in a combined state.

The mold has the same construction and function as the first embodiment.
That is, the hook-forming sliding core 2 has a shape that matches the hook-forming portion 17a.
0 and 21 are connected by a connecting rod 22 using a key 23, and the mold is opened, thereby operating the inclined cam 24. As a result, the entire hook-forming sliding cores 20, 21 are operated in a direction perpendicular to the mold opening direction, and the undercut of the hook-forming portion 17a is treated.

〔Effect of the invention〕

In order to increase the number of products per unit area of the mold in the conventional technology, it was necessary to increase the size of the mold, but in the present invention, the size of the mold has to be increased by 4. It is possible to produce up to 6 times as many products, and since it is an integrally molded embodiment, 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 split 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 a perspective view of a split type clip hanger made using a conventional mold.
The figure is a perspective view of an integrated clip hanger made using a conventional mold, Figure 5 is a plan view of the same mold (however, only the lower mold), and Figure 6 is a cross section taken along the line shown in Figure 5. 7 is a plan view of a mold (only the lower mold) used in the manufacturing method of the first embodiment of the present invention, FIG. 8 is a sectional view taken along the line of FIG. 7, and FIG.
The figure is a sectional view taken along the line of FIG. 7, FIG. 10 is a plan view of a mold (only the lower mold) used in the manufacturing method of the second embodiment of the present invention, and FIG.
FIG. 12 is a cross-sectional view taken along the line FIG. 10. In the figure, 1: upper mold, 2: lower mold, 3: sprue, 4: runner, 5: product part sprue, 6: dividing surface,
7: Extrusion pin, 8: Product forming part, 8a: Hook forming part, 8b: Holding piece forming part, 8c: Tip, 9: Sliding core for forming holding piece, 10: Inclined cam, 11: Slide for hook forming Moving core, 12: Connecting rod, 13: Key, 14: Space, 15: Sliding core for hook formation, 16: Inclined cam, 20: Sliding core for hook formation, 21: Sliding for hook formation Core, 22: Connecting rod, 23: Key, 24: Inclined cam, 30: Upper mounting plate, 31: Lower mounting plate, 32: Ejector plate, 33: Ejector plate, 34: Plate guide rod, 35: Spring , 36: Spacer block, 37: Extrusion rod, 38: Through 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 pieces are formed in parallel, and the body part of the molded product is formed by the upper and lower molds 1 and 2, and the upper mold and the lower mold 1,
The main body forming sliding core 9 is parallel to the dividing surface 6 of the molded product and movable in the same direction as the flattening direction of the molded product. Molding using a plurality of hook-forming sliding cores 11 having a matching shape, arranged in a direction parallel to the mold dividing surface 6, and movable in a direction perpendicular to the flattening direction of the molded product. After molding, the upper mold 1 and the lower mold 2 are opened in the vertical direction, and the sliding core 9 for forming the main body part is slid by the inclined cam 10 provided on the upper mold 1, and at the same time By sliding the connecting rod 12 connecting each of the hook-forming sliding cores 11 by an inclined cam 16 provided on the upper mold 1, each hook-forming sliding core 11 is connected to the hook portion. A method for manufacturing a hanger or the like having a hook portion, characterized in that the molded product is taken out after being retracted further.