JPH0321941Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a mold for molding a golf club head, more specifically, a type of synthetic resin golf club head commonly called a wood, driver, or spoon. This makes it easier to cut out molded products.

[Conventional technology]

In recent years, instead of natural wood such as persimmon or cherry wood, golf club heads, ie, wood heads, are being made of synthetic resin, mainly made of synthetic resin materials such as nylon-66 and ABS resin.

Conventionally, when molding such synthetic resin club heads, nylon,
ABS resin or a mixture of these and glass fiber pieces is heated and melted, injected and filled, and then solidified or hardened to form a molded product.

[Problem that the invention attempts to solve]

However, in most cases, head molding requires
Usually, a split mold is used, and the split mold requires an injection port for injecting the molten synthetic resin material into its cavity. In the product area near the inlet, when the molten synthetic resin material is injected into the cavity from the injection port, the flow of the molten synthetic resin material changes in a complicated manner, and the flow pattern of the synthetic resin material that occurs due to this changes inside the thick wall. Even if the surface of the sprue that connects to the inlet is finished by grinding, etc., the flow pattern cannot be removed and becomes noticeable.
If this is present in a part that is easily visible to people, it is not desirable from the quality of the club head, and it also reduces the value of the product.

Furthermore, the club head product that has been injected into the cavity of the split mold from an injection machine and solidified must be removed from the mold, but in this case, the molded product must be easily removed from the mold. In order to achieve this, it is common to use a split type club head, as shown in Japanese Patent Publication No. 43-19888, in which the club head is divided into halves from front to back in a plane that includes the axis of the neck portion.

As a result, sprue cut marks as described above are produced on the top surface of the molding head, which is not desirable in terms of quality, and when the synthetic resin material filled in the mold hardens, it may become integral with the molded product. There has been a problem in that the synthetic resin material, ie, the sprue, in the connected injection port makes it difficult to remove the molded product from the mold.

[Purpose of invention]

This idea solves the conventional problems mentioned above.
The sprue formed at the synthetic resin injection port does not affect the removal of the molded product from the mold.
In addition to making it possible to easily cut out a small amount of the mold, the sprue cut marks that are inevitably formed by the combined split molds are created in a position that is not noticeable to the public eye, thereby improving the product value and making it easier to cut out the mold. An object of the present invention is to provide a mold for easily molding a golf club head.

[Means for solving problems]

The mold for molding a golf club head according to this invention has first and second split molds that form a cavity that matches the external shape of the club head body, and is located at the lower center end of the face portion of the club head body. , and an injection port for molten synthetic resin is formed on the mating surfaces of the first and second split molds and opens into the cavity.

[Effect of invention]

In this invention, the synthetic resin injection port is formed on the mating surfaces of the first and second split molds at the lower center end of the face portion of the club head body, so when the mold is removed after molding, the synthetic resin injection port is The sprue that forms on the surface has no effect.

[Example of idea]

Hereinafter, specific embodiments of this invention will be described with reference to the drawings.

Figures 1 to 3 show the external appearance of a club head (wood head) molded by the mold according to this invention, as well as views from the back and sole sides of the head, which is a synthetic resin molded product. The main body 1 has a face part 2, a top part 3, a sole part 4, a toe part 5, a heel part 6, and a back part 7, and a neck part (socket) 8 diagonally upward from the heel part 6 side of the head main body 1. protrudes, and an insertion hole 9 for attaching a shaft (not shown) is concentrically formed in this neck portion 8. Further, a stepped portion 10 for mounting a sole plate (not shown) is formed in the sole portion 4, and a hollow portion 11 that opens into the sole portion 4 is formed inside the head body 1. This hollow portion 11 is provided to reduce the weight of the head body 1 and to balance the weight of the head body.

In addition, the head body 1 that has been cut out after being molded with synthetic resin has a parting line 12 located at a ridgeline portion corresponding to the boundary between the top portion 3, toe portion 5, and back portion 7, and forming a parting line 12 along the face portion 2. A parting line 13 is located at a ridge line corresponding to the boundary between the toe part 5 and the sole part 4, and is connected to each of the above-mentioned parting lines 12 or 13 along both front and rear sides of the heel part 6 and neck part 8. Parting lines 14 and 15 are formed, respectively.

Figures 4 and 5 show an example of a mold for molding the club head with synthetic resin.
Reference numerals 6 and 17 designate a joint mold that is divided into upper and lower halves, and the first joint mold 16 includes a top portion 3 located above each parting line 12 and 13 of the head body 1; A cavity portion 18a forming the outer shape of the upper half of the neck portion 8 located above the portion 2 and the parting lines 14, 15 is formed. A cavity part 18b is formed to form the outer shape of the lower half of the toe part 5, the back part 7, the sole part 4, the heel part 6 and the neck part 8 located below the parting lines 14 and 15. These first and second split molds 16 and 17 are stacked vertically and their mating surfaces 16a and 17a (corresponding to the parting line)
When they are joined together, a cavity 18 that forms the entire golf club head body 1 is formed. Further, a rod-shaped core 19 for forming a shaft insertion hole 9 is disposed in the cavity portion forming the neck portion 8 of the head body 1, and the upper end of this core 19 is connected to the first and second mating holes. Split mold 16,1
It is designed to be held between the neck molding side portions of No. 7, and its lower end is engaged and held by an engaging portion 20 formed on the second split mold 17. Furthermore, cores 21 and 24 for forming the cavity 11 within the head body 1 are integrally formed in the center of the cavity portion 18b of the first split mold 17.

Further, reference numeral 22 is an injection port for injecting the head molding synthetic resin material into the cavity 18, and this injection port 22 is connected to the left and right center line L (see FIG. They are formed on the mating surfaces of the first and second split molds 16 and 17 at orthogonal portions.
In the embodiment shown in FIGS. 4 and 5, the first combined mold 1
It is formed on the mating surface corresponding to the parting line 13 of No. 6.

When molding a club head using the above mold, as shown in FIG. 5, after setting the core 19 for forming the shaft insertion hole in the second split mold 17,
The first and second split molds 16 and 17 are stacked one on top of the other as shown in FIG. 5, and then polycarbonate,
Synthetic resin materials such as ABS resin and nylon with a diameter of 7~
At least one of carbon fibers or glass fibers having a diameter of 8 microns and a length of 0.1 to 1 mm is added and mixed in an amount of 20 to 30% by weight, and after heating and melting this mixed synthetic resin material 23, it is combined from the injection port 22 with an injection device. The sixth mold is placed in the cavity 18 of the split molds 16 and 17.
Fill by injection as shown in the figure. After solidification or hardening, the mold is opened and the molded product, that is, the head body 1, is taken out from the mold.

The above-mentioned mold opening is performed by separating the first and second split molds 16, 1
7 in the direction of the arrow in FIG. 6. At this time, since the injection port 22 is on the parting line 13, the injection port 2
The sprue connected to the head body 1 produced by the sprues 2 does not interfere in any way with opening the mold and demolding the molded product. This means that opening the mold and demolding the molded product becomes easier.

Furthermore, when the molten synthetic resin material is injected, a flow pattern 25 is generated in the face portion 2 of the head body 1 facing the injection port 22 as shown in FIG. By cutting and removing the shape shown in the two-dot chain line and attaching a separately molded face plate (not shown) to this part, the flow pattern 25 can be obtained.
can be completely eliminated.

[Effect of idea]

As described above, according to this invention, the synthetic resin injection port is provided at the lower center of the face part and above the parting line of the first and second split molds, so that the synthetic resin injection port is formed at the injection port. The sprue does not interfere with the opening of the mold and the removal of the molded product from the mold, making it easy to open and remove the mold, and the injection port can be placed opposite the part where the face plate is attached. , it is possible to make the flow pattern less noticeable, and it has the effect of preventing a decrease in product value due to this.

[Brief explanation of the drawing]

Figure 1 is an external view of the club head body formed by the mold according to this invention, Figure 2 is a side view of the head body seen from the back side of Figure 1, and Figure 3 is the sole side of Figure 1. FIG. 4 is a side view of the combined mold that constitutes the club head molding mold according to this invention, and FIG. 5 shows the first and second combined molds stacked one on top of the other. FIG. 6 is a sectional view showing a state in which the first and second split molds are filled with synthetic resin to mold the head body. 1...Head body, 2...Face part, 3...
...Top part, 4...Sole part, 5...Toe part, 6
... Heel part, 7 ... Back part, 8 ... Neck part, 9 ... Shaft insertion hole, 10 ... Step part for attaching sole plate, 11 ... Hollow part, 12-15 ... Parting line, 16 ...First combined split type, 17
...Second combined split mold, 18...Cavity, 1
9, 21...core, 22...inlet, 23...mixed synthetic resin material.

Claims (1)

[Scope of utility model registration request] It has first and second split molds that form a cavity that matches the external shape of the club head body,
An injection port for molten synthetic resin is provided, which is located at the lower center end of the face portion of the club head body, is formed on the mating surfaces of the first and second split molds, and opens into the cavity. A mold for molding golf club heads.