JP3354604B2 - Golf Ball Mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding a golf ball, and more particularly, to a plurality of dimples located on the upper and lower mold parting lines of the mold for molding. In addition, the present invention relates to a golf ball molding die that eliminates generation of burrs and the like at the center of dimples existing on a parting line and facilitates post-processing.

[0002]

2. Description of the Related Art In general, it is said that the dimple arrangement formed on a spherical surface of a golf ball has excellent symmetry, and the higher the symmetry, the better the flight distance of the golf ball. By the way, conventional golf balls are arranged based on a spherical division based on a regular dodecahedron, regular icosahedron, or 12-20 icosahedron such that dimples have symmetry about a large number of symmetry lines. However, dimples are not arranged on a great circle (parting line) that is used as a mold dividing line (joint of the mold) and divides the spherical surface into two. For this reason, it is customary not to arrange dimples on the great circle when molding a golf ball using a two-piece molding die.

On the other hand, golf balls having dimples arranged on the great circle have been disclosed in order to improve the symmetry (Japanese Patent Application Laid-Open Nos. 64-8983, 3-286786 and 64-286786). 3-140168).

[0004]

However, in the above-mentioned conventional golf balls in which no dimples are arranged on the great circle, the number of symmetry lines is limited, and as a result, the symmetry of the golf ball is reduced. There is a limit in improving the moldability.Moreover, to arrange the dimples on the mold parting line and manufacture the molding die, it is necessary to process the radial dimples with high precision and to align the dimples of the upper and lower molds. It was very difficult.

Further, there has been proposed a method of forming dimples on a parting line by cutting or heating after forming a golf ball. However, in the case of the method of forming a dimple according to the above-described method, burrs and the like are severely generated at the center of the dimple existing on the parting line, and the burrs and the like are removed by conventional coreless polishing for a golf ball. However, there is a problem that the post-processing is difficult.

For this reason, as a mold for forming dimples on a great circle that divides a spherical surface into two, for example, Japanese Patent Publication No. 3-813
In No. 94, a corrugated surface is formed on the dividing surface of the mold, which is in close contact with each other and extends along the equator around the equator, and the inner surfaces of the two dies are positioned on the equator and do not intersect with the dividing surface. In this case, a dimple forming projection is formed. However, manufacturing such a complicated mold requires a lot of labor and time, and also requires a great deal of cost. In addition, restrictions on the dimple arrangement surface also increase.

The present invention has been devised in view of such a conventional problem. In molding a golf ball having dimples over a symmetric axis including a great circle that divides a spherical surface into two parts, The present invention provides a golf ball molding die which does not generate burrs or the like at the center of the dimples, which facilitates post-processing of the golf ball, and which can be easily removed by conventional golf ball coreless polishing or the like. The purpose is to do so.

[0008]

According to the present invention, in order to achieve the above object, a tip having the same shape as a plurality of dimples straddling the dividing line is formed on the upper and lower dividing lines of a molding die. The gist is that a predetermined number of the provided pins are provided at a predetermined position, and a concave portion for fitting the pin is formed on a cavity mating surface of the upper and lower molding dies.

Further, the pin is fixed to one cavity mating surface of the upper and lower molding dies, and a concave portion for fitting the pin into the other mold is provided. It is also possible to allow a predetermined number of pins to be taken in and out and to be movable in the mold dividing direction.

[0010]

According to the present invention, a tip having the same shape as a plurality of dimples straddling on the dividing line is formed on the cavity mating surface on the upper and lower dividing lines of the molding die. When a predetermined number of pins are provided at predetermined positions and the golf ball is molded with the upper and lower molding dies closed, the molding is performed over the symmetry axis including the parting line as in the related art. The center portion of the dimple does not have burrs or the like, is easy to perform post-processing, and can be easily removed by conventional golf ball coreless polishing or the like.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view of a golf ball 2 formed by using an upper and lower molding die 1 according to the present invention,
FIG. 2 is a partially cutaway perspective view of the upper and lower molding die 1 composed of an upper die 1a and a lower die 1b, 3 is a parting line (parting line), and 4 is formed on the surface of the golf ball 2. The dimples 5 and 5 indicate dimples straddling the dividing line 3.

A plurality of projections 6 for forming dimples 4 formed on the surface of the golf ball 2 are formed on the inner wall surfaces of the upper die 1a and the lower die 1b. As shown in FIGS. 2 and 3, a plurality of ridges extending over the dividing line 3 are provided on the cavity mating surface 7 between the upper die 1a and the lower die 1b of the upper and lower molding die 1 in the embodiment of the present invention. 5 dimples
The pin 8 having a tip shape having the same shape as the shape of
A predetermined number is provided at a predetermined position.

When the pins 8 are inserted into and fixed to at least one cavity mating surface 7 of the upper mold 1a and the lower mold 1b at the time of machining the cavity 9 of the upper and lower molding dies 1,
On the cavity mating surface 7 of the other mold, a concave portion 10 into which the pin 8 is fitted is formed. In addition, in principle, the cavity mating surface 7 of the upper mold 1a and the lower mold 1b facing each other.
In this case, only the half processing of the recess 10 corresponding to the pin 8 is performed.
Further, the plurality of pins 8 can be configured to be able to advance and retreat or move up and down with respect to the cavity mating surface 7 between the upper mold 1a and the lower mold 1b.

As described above, the upper mold 1 of the upper and lower molding dies 1
When a predetermined number of pins 8 are arranged at predetermined positions of a cavity mating surface 7 of the lower mold 1b and the lower mold 1b, and the golf ball 2 is molded using the upper and lower molding dies 1, the dividing line 3 No burrs or the like are formed at the center of the dimple 5 formed over the upper part. Therefore, when the formed golf ball 2 is processed, the dimple formed over the dividing line 3 is formed. The center portion of 5 does not need to be processed at all, is easy to perform post-processing, and easily removes burrs and the like as well as around the current support pins and air vent pins by conventional coreless polishing for golf balls. You can do the work.

[0015]

According to the present invention, as described above, the cavity mating surface on the dividing line of the upper and lower molding dies has a tip shape having the same shape as the shape of a plurality of dimples straddling on the dividing line. A predetermined number of pins are arranged at predetermined positions, and a concave portion for fitting the pin is formed on the cavity mating surface of the upper and lower molding dies, so that burrs or the like are formed at the center of the dimple straddling the dividing line. There is no generation, so post-processing of the golf ball is easy, and burrs and the like can be easily removed in the same manner as around the current support pins and air vent pins by conventional coreless grinding for golf balls, etc. This has the effect of improving workability and productivity.

[Brief description of the drawings]

FIG. 1 is a front view of a golf ball formed by using an upper and lower molding die according to the present invention.

FIG. 2 is a partially cutaway perspective view of an upper and lower molding die.

FIG. 3 is a perspective view of a pin provided on a cavity land portion of the upper and lower molding dies.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Upper and lower molding die 1a Upper die 1b Lower die 2 Golf ball 3 Dividing line (parting line) 4 Dimple 5 Dimple straddling the dividing line 6 Projection 7 Cavity mating surface 8 Pin 9 Cavity 10 Recess

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-137817 (JP, A) JP-A-3-286786 (JP, A) JP-A-3-81394 (JP, B2) (58) Survey Field (Int.Cl. ⁷ , DB name) B29C 45/26-45/37 B29C 33/00-33/76 A63B 45/00 A63B 37/00

Claims (3)

(57) [Claims] 1. A golf ball molding die having dimples on upper and lower mold division lines of a molding die, wherein a plurality of dimples straddling on the division line are formed on the upper and lower division lines of the molding die. A predetermined number of pins having a tip shape having the same shape as the shape are provided at a predetermined position, and a concave portion for fitting the pin is formed in a cavity mating surface of the upper and lower molding dies. Golf ball molding die. 2. The golf ball molding die according to claim 1, wherein the pin is fixed to one cavity mating surface of the upper and lower molding die, and a concave portion for fitting the pin into the other die is provided. Type. 3. A method according to claim 1, wherein the upper and lower molding dies have a cavity mating surface.
2. The golf ball molding die according to claim 1, wherein a predetermined number of pins can be taken in and out and can be moved in the die dividing direction.