JPH10179808A - Burr removing method for golf ball - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove burrs on a parting line surely, beautifully and speedily by rotating at high speed a disc-shaped cutting member with a saw-toothed blade, and bringing the blade into contact with a golf ball with burrs along its parting line. SOLUTION: A golf ball 7 with burrs 10 formed by an injection mold or compression mold is made to rotate freely around an axis L passing a center 0 of the ball 1 while the ball 1 is made at right angles with one plane including a parting line P, and the ball 1 is retained by a retainer 2 and rotated around the axis L which is disposed horizontal or vertical. A disc-like cutting member 6 with a saw-tooth shaped blade 7... rotating at high speed is brought into contact with the ball 1 capable of rotating freely around the axis L to thereby cut and eliminate the burrs 10. Accordingly, even in the case of golf ball 1 whose cover material is soft, its burrs 10 can be removed with a beautifully even depth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a golf ball, and more particularly to a method for removing burrs.

[0002]

2. Description of the Related Art When a golf ball is manufactured by injection molding or compression molding, burrs are formed on a parting line of the ball, and it is necessary to remove the burrs.
Various methods have been known to remove such burrs, such as grinding with a grindstone (Japanese Patent Application Laid-Open No. 60-232861), cutting with a cutting tool (Japanese Patent Application Laid-Open No. 63-174801), water jetting, and the like. There is a method using a cutter (JP-A-5-228226), an ultrasonic cutter (JP-A-7-241936), or the like.

[0003]

However, when cutting with a grindstone, clogging due to shavings occurs, and with a cutting tool, there is a problem in that the cutting ability is quickly reduced due to early wear of the blade. In addition, the appearance of the grinding wheel or cutting tool is deteriorated due to the roughened surface. In addition, in the method using a water jet cutter, since the diameter of the golf ball varies, there is a possibility that a portion other than the burr may be cut, and the shaved surface is widened, resulting in a poor appearance. Also, in the method using an ultrasonic cutter, since the burrs are melted and cut by frictional heat, there is a risk of melting the surface of the cover material near the parting line, and a trace of melting on the parting line remains. There was a problem.

[0004] Further, any of the above-mentioned methods is a method corresponding to a golf ball using a hard ionomer resin having a Shore D hardness of about 60 to 75 of a conventional cover material. Therefore, it is not suitable for golf balls using a recent cover material having a Shore D hardness of less than 60, especially a soft cover material using a material other than the ionomer resin, and when these cover materials are ground, burrs become soft. To be too
Problems such as the inability to perform grinding and the roughening of the ground surface occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for reliably, beautifully and quickly removing burrs on a parting line of a golf ball having a soft cover material having a Shore D hardness of less than 60 according to JIS. is there. It is another object of the present invention to reliably and stably produce a golf ball having an excellent appearance, in which a tool for directly removing burrs is unlikely to be clogged or worn, and is capable of performing a stable burring operation for a long period of time.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a method of manufacturing a burr of a golf ball (a manufacturing method) according to the present invention is performed while rotating a disk-shaped cutting member having a saw-toothed blade at a high speed. This is a method of cutting and removing the burrs by bringing the burrs into contact along the parting line of a golf ball having the burrs.

Further, a disk-shaped cutting member having a saw-toothed blade is brought into contact with a golf ball having burrs at a high speed so as to have a relative speed of 15,000 to 50,000 mm / s along a parting line of the golf ball. And a method of cutting and removing the burrs.

Further, the hardness of the cover material of the golf ball to be cut is less than 60 in Shore D hardness according to JIS, the rotation speed of the golf ball is 100 to 600 mm / s, and The rotation speed is 14400-50600mm / s. The disk-shaped cutting member has a diameter of 50 to 300 mm and has 10 to 200 blades on the circumference.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on the illustrated embodiments.

FIGS. 1 and 2 are diagrams for explaining a golf ball manufacturing method (burr removing method) according to the present invention. A golf ball 1 with a burr 10 formed by injection molding or compression molding is shown in FIG. The parting line P (corresponding to the equator)
And is rotatable around an axis L passing through the center O of the golf ball, held by holding members (chucking pressing members) 2 and 3 and driven by a driving means (not shown). Is rotated around its axis L at a speed described later.

Each of the holding bodies 2 and 3 has a concave portion 4 or 5 which forms a part of a sphere, and holds the ball 1 surely from the opposite side by 180 °. One of them is rotationally driven by a driving means (not shown).

The axis L is disposed horizontally (or vertically), and the golf ball 1 rotatable about the axis L is rotated at a high speed by a disk-shaped cutting member 6 having saw blades 7. 1 and 2, the burrs 10 are cut and removed by making contact along the parting line P of the golf ball 1.

At this time, as an example, the rotational direction A of the disk-shaped cutting member 6 and the rotational direction B of the ball 1 are moved in opposite directions at the mutual contact position, and the respective rotational (peripheral) speeds are changed. Are set as V ₆ and V ₁ , the following equation is set. 15000 mm / s ≦ (V ₆ + V ₁ ) ≦ 50000 mm / s In other words, along the parting line P of the golf ball 1, the relative (circumferential) speed is set so as to be 15000 mm / s to 50000 mm / s. To cut.

Here, even if the hardness of the golf ball 1 to be cut is less than 60 in Shore D hardness according to JIS, cutting can be performed beautifully, uniformly and quickly to remove burrs. Then, as the rotation of the golf ball 1 (peripheral) speed V _6, it is desirable to 100~600mm / s. If the speed is less than 100 mm / s, it is difficult to uniformly cut the entire circumference.
This is because it is difficult to rotate at a speed exceeding mm / s in terms of the mechanism of the rotation drive and the ball holding (chucking).

Therefore, the rotation (peripheral) speed of the cutting member 6 at this time is (15000−600) = 14400 (mm /
s), (50000-100) = 49900 (mm / s) as a suitable high-speed rotation, the relative speed is 15000-50000mm / s
It is good.

The disk-shaped cutting member 6 has a diameter D of 50 to 300 mm and 10 to 200 blades 7 on the circumference.
Are preferred. If it is less than 50 mm, irregularities are likely to appear on the burrs after cutting, whereas if it exceeds 300 mm, the cutting member 6 becomes large and the rotary drive device becomes large.

If the number of the blades 7 is less than 10, it is difficult to uniformly remove burrs. On the other hand, if the number of the blades 7 is more than 200, each of the blades 7 is reduced in size, and it becomes difficult to discharge cutting powder. Processing is also difficult.

Next, as a modification of the present invention, it is possible to rotate the ball 1 in the rotation direction indicated by the arrow C in FIG. That is, it is also possible to remove the burrs 10 while rotating the cutting member 6 and the ball 1 so as to move in the same direction at the mutually approaching (contact) position.

In this case, the rotation (peripheral) speed V of the ball 1
₁ 'is rotated at 100-600mm / s. The relative speed should be 15,000 to 50000 mm / s. Therefore, the rotation (circumferential) speed of the cutting member 6 may be set in the range of 15100 to 50600 mm / s.

In FIG. 1, the ball 1 and the cutting member 6
In the vicinity of the contact (cutting) position, a suction pipe 9 having a suction port 8 is preferably provided, and air is sucked by a vacuum device (not shown) to suck the cutting powder.

The hardness of the cover material of the golf ball 1 to be cut is a thermoplastic resin (for example, an ionomer resin) having a Shore D hardness of 40 to 75 according to JIS. The blades 7 are rotated at a high speed for cutting, so that the blades 7 are suitable for those having a diameter of less than 60. Further, a cutting time of 0.1 to 5 seconds (sec) is sufficient (although not particularly limited).

Next, Tables 1 and 2 show the results of experiments (data) in which burrs were actually removed under various conditions. Note that a golf ball having an ionomer resin cover material having a Shore D hardness of 55 was used.

[0023]

[Table 1]

[0024]

[Table 2]

The following can be seen from Tables 1 and 2 above. That is, the relative rotation (circumferential) speed is preferably 15,000 to 50,000 mm / s. In the comparative example, since it is too small, burrs are not beautifully removed, the appearance is poor, and the variation is large. On the other hand, in the comparative example, since the rotation speed is excessively high, there is a problem that the appearance finish is largely varied (although the appearance is beautiful) and the wind noise when the cutting member 6 rotates is increased. The comparative example corresponds to the above-described conventional burr removing method, in which the burr cannot be removed beautifully, the appearance is poor,
The variation is large.

[0026]

The present invention has the following remarkable effects by the above-mentioned structure. (According to Claims 1 and 2) Even if the cover material is a soft golf ball 1, the burrs 10 can be quickly removed with a beautiful and uniform depth. In particular, it is possible to produce a golf ball having a stable and beautiful appearance without occurrence of "clogging" in conventional grinding (polishing by a grinder). (According to claim 2) the relative speed is 15000-50000m
m / s, it is light, beautiful, quick and efficient,
Deburring is completed. In particular, the combination of the soft ball of the cover material and the cutting member 6 makes it possible to perform a deburring operation (which has been extremely difficult with conventional grinding stones). Its practical effect is significant. And the rotation speed of the golf ball 1 is 100 to 600 mm /
Since s is appropriate, a beautiful finished surface can be obtained uniformly and quickly along the parting line P. (According to claim 4) a golf ball having an efficient and more beautiful appearance can be manufactured.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part showing an embodiment of the present invention.

FIG. 2 is an explanatory view of a main part viewed from another direction.

[Explanation of symbols]

 Reference Signs List 1 golf ball 6 cutting member 7 blade 10 burr P parting line D diameter

Claims (4)

[Claims] 1. A disk-shaped cutting member having a saw-toothed blade,
A method for removing burrs from a golf ball, wherein the burrs are cut and removed while rotating at a high speed along a parting line of the golf ball having the burrs. 2. A disk-shaped cutting member having a saw-toothed blade,
A burr removal of a golf ball, wherein the burr is cut and removed while rotating at a high speed along a parting line of a burr-containing golf ball so that the relative speed is 15000 to 50000 mm / s. Method. 3. The hardness of the cover material of the golf ball to be cut is less than 60 in Shore D hardness according to JIS, and the rotation speed of the golf ball is 100 to 600 mm / s,
3. The method according to claim 1, wherein the cutting member is rotated at a rotation speed of 14400 to 50600 mm / s. 4. The disk-shaped cutting member has a diameter of 50 to 300 mm.
The method according to claim 1 or 2, wherein the circumference has 10 to 200 blades.