JP2006304943A - Die for molding golf ball and golf ball - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf ball which has a thinner cover and moreover, dimples in parting lines and a die for molding golf balls capable of molding the golf ball. <P>SOLUTION: The die for molding golf balls comprises at least three gates which are disposed at least at one of a pair of dice with a cavity or at a joined portion of the pair of dice to supply a molten resin for forming the cover in the cavity, retreat parts so arranged as to be connected to the respective gates at positions of by no means blocking the supply of the molten resin through the gates, mobile pins each of which makes an end part, having a protruded part corresponding to the shape of each dimple, advance into the cavity and an adjusting means which adjusts the quantity of the molten resin supplied into the cavity from the gates. When the molten resin is supplied into the cavity, the mobile pins are retreated to the retreat parts by a moving means and after the supply of the molten resin, the end parts of the mobile pins are made to advance into the cavity to form each dimple. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides a pair of molds in a golf ball having a cover formed on the surface of the core, the thickness of the cover in the golf ball having dimples formed on the surface of the cover, and high molding accuracy. The present invention relates to a golf ball in which dimples are formed at a position corresponding to a portion to which the golf ball is matched, and a golf ball molding die for molding the golf ball. In particular, the golf ball can be used without changing the die regardless of the material of the cover. The present invention relates to a golf ball molding die that can be molded, and a golf ball molded by this golf ball molding die.

In a golf ball having a core and a cover formed on the surface of the core, and dimples are formed on the surface of the cover, the cover is thinned in order to improve the resilience of the golf ball. Has been made.
Further, in order to reduce the dependency of the golf ball on the rotation axis and improve the flight performance of the golf ball, it is desired to form dimples densely on the entire surface.

FIG. 10 is a schematic cross-sectional view showing a conventional golf ball molding die.
As shown in FIG. 10, a conventional golf ball molding die 100 (hereinafter referred to as a die 100) has an upper die 102 and a lower die 104. The upper die 102 and the lower die 104 include: A cavity 106 is formed which becomes spherical when these are mold-matched.
A gate 108 for supplying molten resin to the cavity 106 is formed in the upper mold 102. Further, the cavity 106 is provided with a support pin 110 that prevents the core 112 accommodated in the cavity 106 from coming into contact with the cavity 106.

  When a golf ball is molded by injection molding using this conventional mold 100, a parting line (a position corresponding to the mating surface of the upper mold 102 and the lower mold 104) is formed on the golf ball. For this reason, dimples cannot be formed on the parting line. Therefore, various methods for forming dimples on the parting line have been conventionally proposed (see Patent Document 1 and Patent Document 2).

  Patent Document 1 discloses a golf ball molding metal in which a mating surface of an upper mold and a lower mold is uneven, a semicircular groove is formed in the mating surface, and a cylindrical member is fitted and fixed in the groove. A mold is disclosed. In this cylindrical member, the protruding portion protruding into the cavity has the same size as the protruding portion formed in the cavity. Thus, by using the golf ball molding die disclosed in Patent Document 1, dimples can be formed on the parting line.

  Further, Patent Document 2 discloses a golf ball molding die in which a predetermined number of pins can be put in and out of the cavity mating surface of the upper and lower molding die and can be moved in the mold dividing direction. As described above, the dimples can be formed in the parting line by allowing the pins to be inserted into and withdrawn from the cavity mating surface of the upper and lower molds and movable in the mold dividing direction.

JP-A-61-173907 JP-A-6-143349

  When a golf ball with a thin cover is formed by injection molding using the conventional mold 100, the gap between the cavity 106 and the core 114 is reduced. For this reason, when the core 114 is deformed by the injection pressure of the molten resin at the time of molding the cover, the gap between the pole portion 106c of the cavity 106 and the core 112 after the deformation becomes small, and the molten resin does not spread, and the thickness Can not mold a thin cover. Thus, the conventional mold 100 has a problem that it is difficult to reduce the thickness of the cover.

  As a measure for suppressing the deformation of the core 114, there is one that increases the cross-sectional area of the gate. However, as shown in FIG. 11, in the golf ball 120, the dimples 122 are not formed on the parting line PL, and are arranged avoiding the parting line PL. Further, in order to form the dimple 122 densely on the entire surface of the golf ball, the gate 108 must be disposed between the dimples 122. For this reason, it is necessary to reduce the cross-sectional area of the gate. As a result, the cross-sectional area of the gate 108 is reduced, and as a result, the injection molding pressure is increased. Further, considering the removal of burrs after molding, etc., it is not preferable to increase the cross-sectional area of the gate 108. For this reason, in the method by injection molding using the conventional mold 100, the injection pressure cannot be lowered to a pressure at which the core does not deform, and there is a limit to the thinning of the cover, and the cover is made to the desired thickness. It cannot be thinned.

  Further, in any of the golf ball molding die disclosed in Patent Document 1 and the golf ball molding die disclosed in Patent Document 2, dimples can be formed on the parting line. However, in both the golf ball molding die disclosed in Patent Document 1 and the golf ball molding die disclosed in Patent Document 2, in order to form dimples densely on the entire surface of the golf ball, the gate is dimpled. Must be placed between. As a result, the cross-sectional area of the gate cannot be increased. For this reason, the injection pressure cannot be lowered, the core is deformed, and the cover cannot be thinned.

  Further, by using a golf ball molding method other than the injection molding method, for example, a press molding method, the cover can be thinned, but the productivity is lower than the method by injection molding, and the production cost of the golf ball increases. There is a problem.

An object of the present invention is to solve the above-mentioned problems of the prior art, and a golf ball having a thin cover and further having dimples in a parting line, and a golf ball capable of forming the golf ball The object is to provide a ball molding die.
Another object of the present invention is to provide a golf ball having a low manufacturing cost and a golf ball molding die that can be manufactured at a low manufacturing cost.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided a golf ball having a cover formed on a surface of a core and having dimples formed on the surface of the cover. A golf ball molding die having a pair of molds for molding a golf ball in two, which is provided with a hemispherical cavity in which convex portions corresponding to dimples are formed. At least three gates that are provided in at least one or a portion where the pair of molds are combined, communicate with the cavity and supply molten resin for molding the cover in the cavity, and the melt in each of the gates A retracting portion provided so as to connect to the gate at a position that does not hinder the supply of resin, and provided so as to be movable in the retracting portion and the gate. A movable pin that enters the cavity; and an adjusting unit that adjusts the supply amount of the molten resin supplied from the gates to the cavity for each gate. The movable pin has a convex shape corresponding to the shape of the dimple, and when the molten resin is supplied into the cavity, the movable pin is retracted into the retracted portion, and the molten resin is put into the cavity. The golf ball molding die is characterized in that after being supplied, the mold is moved toward the cavity and the end of the movable pin enters the cavity to form dimples.

  In the present invention, the adjusting means is formed in the supply path for supplying the molten resin to the gates and in at least one of the supply paths so that the molten resin extends in a direction orthogonal to the supply direction toward the cavity. Therefore, a screw portion and an adjustment member that is screwed into the female screw portion and can be advanced and retracted into the supply path are provided, and the adjustment means is inserted into the cavity from the gates according to the screwing amount of the adjustment member. It is preferable to adjust the supply amount of the molten resin to be supplied.

  In the present invention, the adjusting means has the same number of female screw portions as the number of the gates for each gate on the upstream side in the supply direction of the gates. The adjusting members are preferably screwed together.

  Furthermore, in the present invention, the adjusting means includes at least one supply path for supplying the molten resin to each gate, and at least one supply path so that the molten resin extends in a direction orthogonal to a supply direction toward the cavity. And an adjustment pin group consisting of a plurality of adjustment pins with different lengths to be inserted into the recess, and the adjustment means inserts any adjustment pin of the adjustment pin group into the recess. Accordingly, it is preferable to adjust the supply amount of the molten resin supplied from the gates into the cavity.

  Furthermore, in the present invention, the adjusting means has the recesses formed on the upstream side in the supply direction of the gates in the same number as the gates for each of the gates, and the adjusting pins in the recesses. It is preferable that any adjustment pin of the group is inserted.

  According to a second aspect of the present invention, there is provided a golf ball having a cover formed on the surface of the core and having dimples formed on the surface of the cover, the golf ball of the first aspect of the present invention. The present invention provides a golf ball characterized by being molded by a molding die.

  According to the golf ball molding die of the first aspect of the present invention, at least one of the pair of molds or the pair of the molds is provided and communicated with the cavity, and the cover is placed in the cavity. At least three gates for supplying molten resin for molding, a retracting part provided to connect to the gate at a position not hindering supply of the molten resin in each gate, and the movable part and the inside of the gate can be moved And a movable pin in which an end having a convex shape corresponding to the shape of the dimple enters the cavity, and an adjusting means for adjusting the supply amount of the molten resin supplied from each gate into the cavity for each gate In addition, when the molten resin is supplied into the cavity, the movable pin is retracted to the retracting portion, and the molten resin is supplied into the cavity and then directed toward the cavity. So moved, the end of the movable pin for forming the dimples by entering into the cavity, it is possible to make the size of the gate to the same size as the dimple. Thus, since the size of the gate can be increased as compared with the conventional case, the injection pressure of the molten resin for forming the cover can be reduced. Therefore, deformation of the core can be suppressed. Accordingly, even when the gap between the cavity and the core is small, the molten resin can be spread over the entire core, and thus a golf ball with a thin cover can be formed.

  Further, according to the golf ball molding die of the present invention, the amount of molten resin supplied from each gate into the cavity can be adjusted for each gate. Each supply amount of the molten resin supplied from can be made uniform. For this reason, the state in which the core is arranged at the center of the cavity can be maintained at the time of molding the cover, and the cover can be molded while suppressing the displacement of the core in the cavity. As a result, a golf ball excellent in flight characteristics in which the center position accuracy of the core is increased, the gravity center position accuracy is high, and the influence of eccentricity is suppressed can be obtained.

  Furthermore, according to the golf ball molding die of the present invention, since the supply amount of the molten resin supplied from each gate into the cavity can be adjusted for each gate, the molten resin supplied into the cavity can be adjusted. Can be collected, for example, at the poles of the cavity where the air vent is formed. Thereby, molding defects, such as a sink defect and a transfer defect, can be suppressed due to an air omission defect.

  Further, according to the golf ball molding die of the present invention, since the supply amount of the molten resin supplied from each gate into the cavity can be adjusted for each gate, the material of the cover is changed and melted. Even when the melt viscosity of the resin is changed, the golf ball can be molded with the same mold. That is, the golf ball can be formed using the same mold regardless of the material of the cover.

Furthermore, according to the golf ball molding die of the present invention, dimples can also be formed on the part where a pair of molds are combined, that is, on the parting line. Even in this case, since the thickness of the cover can be reduced, a golf ball having a thin cover and having dimples on the parting line can be formed.
Furthermore, according to the golf ball molding die of the present invention, since the golf ball can be molded by an injection molding method, the equipment cost can be reduced as compared with the press molding, and the manufacturing cost of the golf ball can be reduced. be able to.

Furthermore, the golf ball according to the second aspect of the present invention is formed using the golf ball molding die according to the first aspect of the present invention, and the cover is thin, so that the resilience is excellent. .
In addition, according to the golf ball of the present invention, the eccentricity of the core is suppressed, the core center position accuracy is high, and the flight characteristics with high center-of-gravity position accuracy and the effect of eccentricity are excellent.
Furthermore, according to the golf ball of the present invention, since the dimples can have dimples on the part where the pair of molds can be matched, that is, on the parting line, the dimples can be formed on the entire surface. . Thereby, the symmetry of the arrangement pattern of the dimples can be enhanced, and the dependency on the rotation axis in the flight direction, such as the trajectory being bent by the rotation axis, is suppressed, and the flight performance can be improved.

Hereinafter, a golf ball molding die and a golf ball of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
FIG. 1 is a schematic perspective view showing a golf ball molding die according to a first embodiment of the present invention.

  The golf ball molding die 10 of the present embodiment has, for example, a core 50 (see FIG. 7A) and a cover 52 (see FIG. 7A) formed on the surface of the core 50. The golf ball 40 (see FIG. 7A) in which dimples 42 and 44 (see FIG. 7B) are formed on the surface of the cover 52 is molded, and the surface of the core 50 formed in advance is formed. The cover 52 is formed.

  As shown in FIG. 1, the golf ball molding die 10 has a pair of upper die 12 and lower die 16, and the upper die 12 and the lower die 16 can be opened and closed in the vertical direction V. is there. The vertical direction V is the mold opening / closing direction, the mold closing direction for closing the upper mold 12 and the lower mold 16 is the upward direction, and the mold opening direction for opening the upper mold 12 and the lower mold 16 is the downward direction. .

  The upper mold 12 and the lower mold 16 of the golf ball molding die 10 of the present embodiment are formed with hemispherical cavities 20a and 20b, respectively. The mating surface 12a of the upper mold 12 and the mating surface 16a of the lower mold 16 are combined to form a spherical cavity 20 (see FIG. 3B). The size of the cavity 20 is formed in accordance with the size of the golf ball 40 to be formed (see FIG. 7A).

  Further, convex portions 22 for forming golf ball dimples are formed on the inner peripheral surfaces of the cavities 20a and 20b, respectively. The convex portion 22 is formed according to the shape of the dimple. The convex portions 22 are transferred to the surface to be a golf ball, and dimples are formed. Air cavities 21a and 21b (see FIG. 3B) are formed in the cavities 20a and 20b, and support pins 28 (see FIG. 3B) are provided.

  In the present embodiment, on the mating surface 16a of the lower mold 16, for example, ten gates 24 communicating with the cavity 20b are formed radially around the periphery of the cavity 20b. Each gate 24 is provided with a retracting groove (retracting portion) 26.

A runner (supply path) 27 that communicates with all the gates 24 and the retracting groove portions 26 is formed on the mating surface 16 a of the lower mold 16. The runner 27 supplies molten resin to each gate 24. The runner 27 is formed on the cavity 20b side of the retracting groove 26 so as to surround the cavity 20b, and has a groove shape having an end 27a.
Moreover, the adjustment means 60 is provided in the bottom part 27b between each gate 24 of the runner 27, for example, a total of eight adjustment means 60 are provided. In this embodiment, as will be described later, an adjustment means 60 is provided in the runner 27 between the gates 24, and the supply amount of the molten resin supplied into the cavity 20 from each gate 24 by the adjustment means 60, that is, each The flow rate of the molten resin flowing into the cavity 20 from the gate 24 can be made uniform. The adjusting means 60 will be described in detail later.

  Further, a sprue 29 is connected to the runner 27. The sprue 29 is connected to, for example, an injection machine that is a molten resin supply source. The molten resin supplied from the injection machine is supplied to each gate 24 through the sprue 29 and the runner 27, and the molten resin is supplied into the cavity 20.

Further, the upper mold 12 is formed with groove portions 14 and 14a corresponding to the gate 24 and the retracting groove portion 26, a groove portion 14b corresponding to the runner 27, and a groove portion 14c corresponding to the sprue 29. In the present invention, it is sufficient that at least three gates 24 are provided.
The gate 24, the retracting groove 26, the runner 27, and the sprue 29 have a predetermined cross-sectional shape by combining the upper mold 12 and the lower mold 16 with the corresponding grooves 14, 14a, 14b, and 14c. It becomes.

  In this embodiment, the gate 24, the retreat groove 26, and the runner 27 are formed at a position where at least one of the upper mold 12 and the lower mold 14, or the upper mold 12 and the lower mold 16 are combined. It is not particularly limited, and is not limited to the mating surface 16a of the lower mold 16 of the present embodiment. For example, the mating surface 12a of the upper mold 12 may be used, and it is needless to say that it may be in another place. However, in the present embodiment, since it is preferable to form dimples on the parting line, the gate 24, the retracting groove 26 and the runner 27 are formed on the mating surface 16a of the lower mold 16 or the mating surface 12a of the upper mold 12. It is preferable to do.

FIG. 2A is an enlarged view of the main part showing the gate and the retracting groove of the golf ball molding die of this embodiment, and FIG. 2B shows the movable pin of the golf ball molding die of this embodiment. It is a typical perspective view shown.
The gate 24 is a supply path for supplying, for example, a molten resin for forming a cover into the cavity 20b. The gate 24 has, for example, a semicircular cross section. The gate 24 has, for example, a circular cross-sectional shape by matching the upper mold 12 and the lower mold 16.
As shown in FIG. 2A, the gate 24 is, for example, a linear groove communicated with the cavity 20b.

The retreat groove 26 is provided to extend the gate 24 and is provided around the runner 27. The retraction groove portion 26 has the same cross-sectional shape as that of the gate 24 and has a semicircular shape. In the present embodiment, the gate 24 and the retracting groove 26 form a substantially linear moving path α that faces the cavity 20b.
The retreat groove 26 is provided at a position (hereinafter also referred to as a retreat position) that does not prevent the molten resin from being supplied when the molten resin is supplied to the gate 24 via the runner 27. That is, it is provided at a position (retracted position) that does not hinder the flow of the molten resin.

  In the present embodiment, there is provided a movable pin 30 that can move along a moving path α formed by the retreat groove portion 26 and the gate 24. Further, the movable pin 30 is provided with a linear moving mechanism (moving means) 32 (see FIG. 3B), whereby the movable pin 30 can freely move along the moving path α.

  The movable pin 30 forms a dimple of a golf ball in the same manner as the convex portion 22 formed in the cavity 20b. As shown in FIG. 2B, in the movable pin 30, the shape of the tip portion 30a on the cavity 20b side has a shape corresponding to the shape of the dimple. The shape of the tip portion 30a on the cavity 20b side of the movable pin 30 is, for example, the same shape as the convex portion formed in the cavity 20b. On the other hand, the end of the movable pin 30 opposite to the tip 30a is formed on the slope 30b. The movable pin 30 of this embodiment moves along the moving path α, and the tip 30a enters the cavity 20b.

  Here, FIG. 3A is a schematic plan view showing a closed state of the golf ball molding die of this embodiment, and FIG. 3B is a diagram showing the closed golf ball molding die of this embodiment. It is a typical sectional side view which shows the state.

  As shown in FIG. 3B, air vents 21a and 21b extending in the vertical direction V are formed at the pole portions (bottom portions) of the cavities 20a and 20b, respectively, and support is provided so as to surround the air vents 21a and 21b. Although only two pins 28 are shown in FIG. 3B, for example, four pins 28 are provided (see FIG. 5). With this support pin 28, the core 50 does not contact the inner peripheral surface in the cavities 20a, 20b, and the gap d between the core 50 and the inner peripheral surfaces of the cavities 20a, 20b is constant over the entire area of the core 50. Retained. Three or more support pins 28 may be provided.

  The air vents 21a and 21b are for discharging the air previously existing in the cavities 20 (20a and 20b) to the outside when the molten resin is injected into the cavities 20 (20a and 20b). The air vents 21a and 21b completely fill the cavity 20 (20a and 20b) with the molten resin and suppress the occurrence of short shots (filling defects). Further, the air vents 21a and 21b can suppress the air gas existing in the cavity 20 (20a and 20b) from being compressed to a high temperature and causing the molded product to be burnt or burnt.

  Further, the support pin 28 is provided with a drive mechanism (not shown) and is movable in the vertical direction V. The support pin 28 is accommodated in the upper mold 12 or the lower mold 16 by the drive mechanism when the cover is molded as will be described later.

Further, as shown in FIG. 3B, the movable pin 30 is provided with the linear movement mechanism 32 as described above. The linear movement mechanism 32 includes a movable rod 34, a connecting member 36 that couples the movable rod 34 and the movable pin 30, and drive means (not shown) that moves the movable rod 34 in the vertical direction. . The linear movement mechanism 32 uses a crank mechanism that converts the vertical movement of the movable rod 34 into the horizontal movement of the movable pin 30. Further, the connecting member 36 is rotatable at any connecting portion of the movable pin 30 and the movable rod 34.
The lower mold 16 is provided with a storage portion 38 in which the movable rod 34 is stored, and the storage portion 38 communicates with the retreat groove portion 26. Thereby, the movable rod 34 can move to the bottom of the groove 14 of the upper mold 12.
Further, the end portion 26a of the retracting groove portion 26 is formed on a slope. This end portion 26a and the inclined surface 30b of the movable pin 30 come into contact with each other and act as a stopper.

  In the linear movement mechanism 32 of the present embodiment, when the movable pin 30 is moved from the retracting groove portion 26 (retracted position) and the tip portion 30a of the movable pin 30 enters the cavity 20b, the movable rod 34 is moved by the driving means. Move upward. As a result, the connecting member 36 is pushed up, the movable pin 30 moves along the moving path α, and the tip 30a enters the cavity 20b (see FIG. 2B). Thereby, dimples are formed on the cover surface. At this time, the movable rod 34 comes into contact with the bottom of the groove 14 provided in the upper mold 12 and stops, and the entry of the tip 30a of the movable pin 30 is restricted. For example, the approach of the distal end portion 30a of the movable pin 30 can be adjusted by the depth of the groove portion 14.

On the other hand, when the movable pin 30 is retracted from the cavity 20 b to the retracting groove portion 26, the movable rod 34 is moved downward by the driving means, and the movable pin 30 is moved to the retracting groove portion 26 via the connecting member 36. At this time, the inclined surface 30b of the movable pin 30 comes into contact with the end portion 26a of the retracting groove portion 26 and stops. As a result, the movable pin 30 is positioned at the retracted position.
In the present embodiment, the linear movement mechanism 32 is the crank mechanism described above, but there is no particular limitation as long as the movable pin 30 can be moved freely along the movement path α.

Next, the adjusting means 60 of the golf ball molding die 10 of this embodiment will be described in detail with reference to FIGS.
FIG. 4A is a schematic cross-sectional view showing the adjusting means of the golf ball molding die according to the first embodiment of the present invention, and FIG. 4B is a partial cross-sectional view of the main part of FIG. FIG. FIG. 5 is a schematic plan view showing the lower mold of the golf ball molding die according to the first embodiment of the present invention. In FIG. 5, only the arrangement of the gates 24, 24a, 24b, the runner 27, the sprue 29, and the movable pin 30 in the lower mold 16 of the golf ball molding die 10 of the present embodiment is shown.

  As shown in FIG. 4 (a), the adjusting means 60 is formed on the bottom portion 27b of the runner 27, so that the screw portion 62 and the adjusting member 64 on which the male screw portion screwed to the female screw portion 62 is formed. It is what has.

  The female thread portion 62 is formed on the inner peripheral surface of a recess formed in the bottom portion 27b of the runner 27 so as to extend in a direction orthogonal to the direction (supply direction) in which the molten resin flows toward the cavity 20b, for example, the vertical direction V. A screw (not shown) is formed. The recess has a circular shape in plan view.

  The adjustment member 64 is a cylindrical member having a male thread portion that is screwed into the screw of the female thread portion 62, and a slit 64b is formed on the end surface 64a thereof. For example, by engaging the tip of a minus driver with the slot 64 b and rotating the adjustment member 64, the screwing amount with the female thread portion 62 changes. Thereby, the protrusion amount of the adjustment member 64 into the runner 27 can be changed, and the cross-sectional area of the runner 27 can be increased or decreased.

For example, when the length from the mating surface 16a of the lower mold 16 to the end surface 64a of the adjustment member 64 is L, the adjustment member 64 is moved into the runner 27 by changing the screwing amount between the adjustment member 64 and the female thread portion 62. The length L can be changed by protruding or retracting. That is, the cross-sectional area of the runner 27 can be increased or decreased. Thereby, the supply amount of the molten resin supplied from each gate 24 into the cavity 20b can be changed.
In addition, in order to rotate the adjustment member 64, what is formed in the end surface 64a is not limited to the slit 64b. For example, what is necessary is just to be able to rotate the adjustment member 64 using various tools, such as a cross hole, a hexagonal hole, or a square hole.

As shown in FIG. 5, in the golf ball molding die 10 of this embodiment, when molten resin is supplied from the sprue 29 to the runner 27, after the molten resin reaches the end 27a, the molten resin reaches the end 27a. The molten resin is sequentially supplied into the cavity 20b from the near gate. For this reason, the ease with which the molten resin flows is different between the gate 24a closest to the end 27a of the runner 27 and the gate 24b closest to the sprue 29. When the supply amount (flow rate) Fa in the gate 24a is compared with the supply amount (flow rate) Fb in the gate 24b, the supply amount Fa is larger. For this reason, the supply amount Fa of the gate 24a is adjusted by the adjusting means 60 for adjusting the supply amount of the gate 24a so that the supply amount Fb of the gate 24b is the same.
In the present embodiment, for example, the cross-sectional area of the runner 27 is adjusted according to the distance of the gate 24 from the sprue 29, and the supply amount of the molten resin supplied into the cavity 20 from each gate 24, 24a, 24b is uniform. Can be.

  In the golf ball molding die 10 of the present embodiment, the supplied molten resin is supplied to the cavity 20 (20a, 20b) by equalizing the supply amount of the molten resin supplied from each gate 24 to the cavity 20b. It flows toward the pole and gathers at the pole. For this reason, the air etc. which are present in the cavity 20 from the beginning are collected at the poles of the cavity 20 and discharged from the air vents 21a and 21b. Thereby, generation | occurrence | production of the manufacturing defect (molding defect) by air omission defect can be suppressed.

  Further, in the golf ball molding die 10 of the present embodiment, even when the type of the molten resin is changed, the supply amount of the molten resin supplied from each gate 24 into the cavity 20 can be adjusted. At the same time, the amount of molten resin supplied from each gate 24 into the cavity 20 can be made uniform. For this reason, when changing the material of the cover, it is possible to respond by changing the setting of each adjusting means 60 according to the melt index of the material of the cover without changing the mold.

  In this embodiment, the adjusting means 60 is provided on the bottom 27b of the runner 27 between the gates 24. However, the present invention is not limited to this. Any position where the amount of molten resin supplied from each gate 24 into the cavity 20 can be adjusted is acceptable. For example, it may be formed in the groove 14b of the upper mold 12. The adjusting means 60 may be configured such that one adjusting means 60 is provided for one gate 24 on the upstream side of each gate 24 in a runner 27 (supply path) that supplies molten resin to each gate 24. . In other words, the adjusting means 60 may be arranged on the upstream side in the molten resin supply direction for each gate 24.

  In the present embodiment, one sprue 29 is provided for the runner 27, but the present invention is not limited to this. For example, even if a plurality of sprues 29 are provided, each supply amount of the molten resin from each gate 24 into the cavity 20 can be adjusted.

  In the golf ball molding die 10 of this embodiment, since the gates 24 have the same size as the dimples, the amount of molten resin supplied from the gates 24 into the cavities 20 is larger than in the past. Further, in the golf ball molding die 10 of the present embodiment, the ease of flow of the molten resin differs depending on the position where each gate 24 is formed and the position of the spru 29, and the dependency on the formation position of the gate 24, etc. is there. As a result, in the golf ball molding die 10 of the present embodiment, there is a possibility that the respective supply amounts of the molten resin supplied from the respective gates 24 are not uniform. For this reason, in particular, in the present invention in which the cross-sectional area of the gate is large, the provision of the adjusting means 60 can provide an even more remarkable effect than the conventional one having a small gate.

  In the golf ball molding die of the present invention, the material of the cover is changed by increasing the flow passage cross-sectional area of each gate 26 with a margin from the normal design, and is currently used. Even when a resin having a melt index smaller than that of the resin is used, the cover can be easily formed.

  In the golf ball molding die 10 of the present embodiment, the gate 24 has the same size as that of the movable pin 30 that forms the dimple, so that the cross-sectional area of the gate 24 is increased as compared with the conventional one. Can do. Thereby, since the injection pressure of molten resin can be lowered | hung, the deformation | transformation of the core 50 can be suppressed. For this reason, even when the gap d between the core 50 and the inner peripheral surface of the cavity 20 is small, contact between the core 50 and the inner peripheral surface of the cavity 20 due to deformation of the core 50 during cover molding is avoided, and the thickness is thin. The cover can be molded. Thereby, a golf ball with high resilience can be obtained.

  Further, by forming the gate 24 on the mating surface 16a of the upper mold 12 and the lower mold 16, dimples can be formed on the parting line of the golf ball. For this reason, dimples can be formed on the entire surface. Thereby, the symmetry of the arrangement pattern of the dimples can be enhanced, and the dependency on the rotation axis in the flight direction, such as the trajectory being bent by the rotation axis, is suppressed, and the flight performance can be improved. Further, the arrangement pattern of the dimples can be increased.

  Further, in the golf ball molding die 10 of this embodiment, the amount of molten resin supplied from each gate 24 into the cavity 20 can be made uniform. Thereby, the shift | offset | difference of the holding position of the core 50 supported by the support pin 28 can be suppressed at the time of cover molding. For this reason, the thickness of the cover 52 can be made uniform, and the core 50 can be placed at an appropriate position, so that a golf ball with high molding accuracy with excellent accuracy of the center of gravity can be formed.

  Further, in the golf ball molding die 10 of the present embodiment, since the supply amount of the molten resin supplied from each gate 24 can be made uniform, air vents that are present in the cavity 20 from the beginning are air vented. 21a and 21b can be discharged, and the occurrence of manufacturing defects due to poor air leakage can be suppressed.

  Furthermore, in the golf ball molding die 10 of the present embodiment, even when the type of the molten resin is changed due to the change in the material of the golf ball cover, it is supplied into the cavity 20 from each gate 24. The supply amount of the molten resin can be adjusted, and the supply amount of the molten resin supplied from each gate 24 into the cavity 20 can be made uniform. For this reason, when changing the material of the cover, it is possible to cope with it only by changing the setting of each adjusting means 60 according to the melt index of the material of the cover.

  As described above, the golf ball molding die 10 of the present embodiment provides a golf ball having a thin and uniform cover, dimples on the parting line, and high symmetry of the dimple arrangement pattern. Can be formed. Furthermore, since the position holding accuracy of the core 50 in the cavity 20 during cover molding can be increased, the gravity center position accuracy can also be increased. For this reason, this golf ball has a high resilience, and also has a small eccentricity and extremely excellent flight performance. Further, in this embodiment, since the dimples can be formed on the parting line, the dimple design of the golf ball can be various.

In addition, the core 50 in this embodiment is not particularly limited as long as it is generally used for a golf ball, and may be a single layer structure or a multilayer structure of two or more layers.
The core 50 is formed of a rubber composition containing, for example, a base rubber mainly composed of polybutadiene, an unsaturated carboxylic acid metal salt, an organic peroxide, zinc oxide, or barium sulfate. . In particular, the core 50 is preferably formed of rubber containing polybutadiene having 40% or more of cis-1,4 bonds.

  Moreover, the rubber | gum which has a polybutadiene as a main component can also be used independently for base rubber, and another rubber component may be used together as needed. Other rubber components include, for example, natural rubber (NR), polyisoprene rubber (IR), styrene-butadiene copolymer rubber (SBR), chloroprene rubber (CR), butyl rubber (IIR), ethylene-propylene-diene rubber. (EPDM), ethylene-propylene rubber (EPM), and ethylene-butene rubber (EBM).

Moreover, the structure of a cover will not be specifically limited if it is generally used for a golf ball, and it may consist of a single layer structure or a multi-layer structure.
The material for forming the cover 52 is not particularly limited as long as it is generally used for golf balls. For example, nylon (registered trademark), ionomer resin, urethane resin, or polyurethane resin may be used. Can be mentioned.

Next, with respect to the golf ball manufacturing method of the present embodiment, FIGS. 1, 3A and 3B, FIGS. 4A and 4B, FIGS. 5, 6A and 6B, and FIG. This will be described with reference to FIGS. 7 (a) and 7 (b).
FIG. 6A is a schematic plan view showing a state at the time of cover molding in the golf ball molding die of this embodiment, and FIG. 6B is a cover molding in the golf ball molding die of this embodiment. It is a typical sectional side view which shows the state of time. FIG. 7A is a cross-sectional view showing a golf ball according to the first embodiment of the present invention, and FIG. 7B is a schematic diagram showing a dimple pattern of the golf ball according to the first embodiment of the present invention. It is.

When the golf ball 40 is manufactured by the golf ball molding die 10 of the present embodiment, first, the supply amount of the molten resin supplied into the cavity 20 from each gate 24 using the molten resin for forming the cover. Make uniform. As a method of making the supply amount of the molten resin from each gate 24 uniform, for example, the core 50 is disposed in the cavity 20 to actually produce a golf ball, and the obtained golf ball is rounded or covered. There is a method of adjusting the adjusting means 60 in order to obtain molding accuracy such as uniformity of thickness. In this way, the supply amount of the molten resin supplied in advance from each gate 24 into the cavity 20 is made uniform.
In addition, the method of making the supply amount of the molten resin from each gate 24 uniform obtains the molding accuracy (roundness or uniformity of cover thickness) of the manufactured golf ball and adjusts the adjusting means 60. It is not limited to the method, that is, the method of changing the screwing amount between the adjustment member 64 and the female screw portion 62.

Next, as shown in FIG. 1, the upper mold 12 and the lower mold 16 are opened, for example, the core 50 is accommodated in the cavity 20b, and the upper mold 12 and the lower mold 16 are closed. At this time, the core 50 is supported by the support pins 28 in the cavity 20 (see FIG. 3B).
Next, a molten resin for forming the cover is supplied to the sprue 29 (see FIG. 1) at a predetermined injection pressure from a molten resin supply source such as an injection device. In this case, the runner 27 is filled with molten resin, and after the molten resin reaches the end portion 27a of the runner 27, the gate 24 connected to the runner 27 is sequentially melted from the gate 24 close to the end portion 27a. Resin is injected into the cavity 20b. At this time, the support pins 28 are accommodated in the upper mold 12 or the lower mold 16. Further, the movable pin 30 is retracted in the retracting groove 26 and does not hinder the flow of the molten resin flowing through the gate 24 and the runner 27. Further, since the amount of molten resin supplied from each gate 24 is uniform, the core 50 is maintained at a position supported by the support pins 28.

  Next, after an amount of molten resin necessary for molding the cover is supplied into the cavity 20 at a predetermined injection pressure, the movable rod 34 is moved upward by the driving means to retract the movable pin 30. The movable pin 30 is moved from the groove portion 26 (retracted position), and the movable pin 30 enters the gate 24. Further, the distal end portion 30a of the movable pin 30 enters the cavity 20b (see FIGS. 6A and 6B). . A dimple is formed at a position where the tip portion 30a of the movable pin 30 becomes a parting line of the golf ball.

Next, after the predetermined time has elapsed, after the molten resin has hardened, the movable rod 34 is moved downward by the driving means to move the movable pin 30 to the retracted position (see FIGS. 3A and 3B). Next, the upper mold 12 and the lower mold 16 are opened, and the molded golf ball is taken out.
In this way, the golf ball 40 having the core 50 as shown in FIG. 7A and the cover 52 formed on the surface of the core 50 can be formed.

  By the method for manufacturing the golf ball 40 using the golf ball molding die 10 of the present embodiment, as shown in FIG. 7B, the dimple 42 by the convex portion 22 of the cavity 20 and the movable pin are formed on the surface of the golf ball 40. 30 dimples 44 (see FIG. 7B) can be formed.

  Further, in the method for manufacturing the golf ball 40 using the golf ball molding die 10 of the present embodiment, since the dimple 44 is formed by the movable pin 30, the molten resin remaining on the gate 24 becomes a residue as the golf ball 40. Does not remain on the surface. For this reason, the operation | work which removes a gate becomes unnecessary and the productivity of the golf ball 40 can be improved.

  Furthermore, in the method for manufacturing the golf ball 40 using the golf ball molding die 10 of the present embodiment, the size of the cross-sectional area of the gate 24 is the same as that of the dimple 44. Since the deformation of the core 50 can be suppressed, the thickness of the cover can be reduced as compared with the conventional method.

  Moreover, since the supply amount of the molten resin supplied from each gate 24 is made uniform, the force acting on the core 50 by the molten resin supplied from each gate 24 is also equal. For this reason, the shift | offset | difference of the holding position of the core 50 supported by the support pin 28 is suppressed. As a result, the gap d between the core 50 and the inner peripheral surface of the cavity 20 is kept constant over the entire area of the core 50. Therefore, the golf club with the core 50 positioned at an appropriate position and excellent in the accuracy of the center of gravity position. A ball can be formed. Such a golf ball having a high accuracy in the position of the center of gravity is excellent in flightability with little shake even when rotated.

  Furthermore, since the supply amount of the molten resin supplied from each gate 24 is made uniform, the molten resin supplied into the cavity 20 becomes the pole part of the cavity 20 provided with the air vents 21a and 21b, so Defects can be suppressed, and production defects (molding defects) such as sink defects and transfer defects can be suppressed.

  Further, in the golf ball molding die 10 of this embodiment, even when the type of the molten resin changes due to a change in the material of the cover, etc., the molten resin supplied into the cavity 20 from each gate 24 is changed. The supply amount can be adjusted, and the supply amount of the molten resin supplied from each gate 24 into the cavity 20 can be made uniform. For this reason, when the material of the cover is changed, it is possible to cope with it by changing the setting of each adjusting means 60 according to the melt index of the material of the cover using the same die without changing the die. . Even when the cover material is changed, the effects of the above-described embodiment can be obtained.

  In addition, in the manufacturing method of the golf ball 40 by the golf ball molding die 10 of this embodiment, since the molding is performed by the injection molding method, the equipment cost can be reduced as compared with the press molding, and the manufacturing cost can be reduced. Can be lowered.

Further, the golf ball 40 molded by the golf ball molding die of the present invention has a cover 52 that is thinner than the conventional one, and dimples 44 are also formed on the parting line PL. Yes. For this reason, resilience can be made high compared with the conventional one. Furthermore, the region where the dimples 42 and 44 are not formed can be reduced, and the dimples 42 and 44 can be formed on the entire surface. Thereby, the symmetry of the arrangement pattern of the dimples 42 and 44 can be enhanced, and the dependency on the rotation axis of the golf ball 40 in the flight direction, such as the trajectory being bent by the rotation axis, is suppressed, and the flight performance of the golf ball 40 is improved Can be made.
In addition, since the dimples are formed also on the parting line PL, the golf ball 40 of the present embodiment further increases the arrangement pattern of the dimples 42 and 44 of the golf ball 40, so that the dimple design of the golf ball 40 is increased. Can be diversified.

  In addition, although the golf ball 40 of the present embodiment has been described by taking a two-piece ball of the core 50 and the cover 52 as an example, the present invention is not limited to this, and the cover has a two-layer structure. Of course, it may be a piece ball. In addition, the golf ball molding die of the present invention is not particularly limited as long as it forms an outermost layer on which dimples are formed in the golf ball.

Next, a second embodiment of the present invention will be described.
FIG. 8A is a schematic cross-sectional view showing a golf ball molding die according to a second embodiment of the present invention, and FIG. 8B is a means for adjusting the golf ball molding die of this embodiment. It is a schematic diagram which shows the pin group used for (c), (c) is a principal part fragmentary sectional view of Fig.8 (a). Here, FIG. 8A is a schematic partial cross-sectional view showing only the lower die 16 of the golf ball molding die 10a according to the second embodiment of the present invention, and the upper die is not shown. is doing.
In this embodiment, the same components as those of the golf ball molding die 10 of the first embodiment shown in FIGS. Description is omitted.

The golf ball molding die 10a of the present embodiment is different in the configuration of the adjusting means 60a from the golf ball molding die 10 of the first embodiment, and other configurations are the same as those of the first embodiment. Since the configuration is similar to that of the golf ball molding die 10, detailed description thereof is omitted.
As shown in FIG. 8A, the adjusting means 60a extends on the bottom 27b of the runner 27 so as to extend in a direction perpendicular to the direction (supply direction) in which the molten resin flows toward the cavity 20b, for example, the vertical direction V. As shown in FIG. 8 (b), the concave portion 66 formed and an adjustment pin group 68 including a plurality of adjustment pins 68 a to 68 d having different lengths inserted into the concave portion 66 are provided.
The recess 66 has a circular shape in a plan view, and a columnar member can be fitted therein. The pins 68a to 68d are cylindrical members that can be fitted into the recesses 66 although the heights thereof are different.

  In this embodiment, by inserting any one of the adjustment pins 68 a to 68 d in the adjustment pin group 68 into the recess 66, the amount of adjustment pin protruding into the runner 27 can be changed. The cross-sectional area can be increased or decreased.

As shown in FIG. 8 (c), by inserting any of the adjustment pins 68 a to 68 d having different heights in the adjustment pin group 68 into the recess 66, for example, the adjustment pin from the mating surface 16 a of the lower mold 16. The lengths M _{1 to} M ₄ up to the upper surfaces 69 of 68a to 68d can be variously changed. In this way, the cross-sectional area of the runner 27 can be increased or decreased to change the amount of molten resin supplied from the gate 24 into the cavity 20b.
Also in the present embodiment, for example, the cross-sectional area of the runner 27 is adjusted according to the distance of the gate 24 from the spru 29, and the supply amount of the molten resin supplied into the cavity 20 from each gate 24 can be made uniform. it can. Thereby, also in a present Example, the effect similar to the golf ball shaping die 10 of a 1st Example can be acquired.

The method for manufacturing the golf ball 40 using the golf ball molding die 10a of this embodiment is the same as the method for manufacturing the golf ball 40 using the golf ball molding die 10 of the first embodiment. Description is omitted.
Also in the present embodiment, any one of the adjustment pins 68a to 68d is inserted in the recess 66 in advance, and the supply amount of the molten resin supplied into the cavity 20 from each gate 24 in advance is made uniform. Next, the golf ball is molded in this state. Thereby, the golf ball 40 similar to that of the first embodiment can be formed, and the same effect as that of the first embodiment can be obtained.
In addition, as a method for making the supply amount of the molten resin from each gate 24 uniform, as in the first embodiment, the molding accuracy of the manufactured golf ball (roundness or uniformity of cover thickness) And adjusting the adjusting means 60a (method of fitting the adjusting pins 68a to 68d having different heights into the recess 66). However, it is not limited to this.

Next, a third embodiment of the present invention will be described.
FIG. 9 is a schematic plan view showing a golf ball molding die according to a third embodiment of the present invention. FIG. 9 is a schematic partial plan view showing only the lower die 16 in the golf ball molding die 10b according to the third embodiment of the present invention, and the upper die is not shown.
In this embodiment, the same components as those of the golf ball molding die 10 of the first embodiment shown in FIGS. Description is omitted.

  The golf ball molding die 10b of the present embodiment is different from the golf ball molding die 10 of the first embodiment in that each gate 24 is provided with a supply passage 70, and each supply passage 70 is provided. Are different from each other in that the adjustment means 60 is provided and the formation position of the runner (supply path) 72 is different, and other configurations are the same as those of the golf ball molding die 10 of the first embodiment. Therefore, detailed description thereof is omitted.

In this embodiment, each gate 24 is provided with a supply path 70 bent (branched). A runner 72 that communicates with all the supply paths 70 is formed outside the movable pin 30 and surrounding the cavity 20b. The runner 72 has an end 72 a, and a sprue 29 a is connected to the runner 72.
In this embodiment, one adjusting means 60 is provided for each supply path 70 formed on the molten resin supply side of the gate 24, that is, for each supply path 70 formed on the upstream side of the gate 24. It is provided in order to adjust the supply amount of the molten resin.

  Also in this embodiment, the gate 24 and the retracting groove 26 form a substantially linear movement path α that faces the cavity 20b. The movable pin 30 is moved along a moving path α formed by the retreat groove portion 26 and the gate 24 by a linear moving mechanism (moving means) 32 (see FIG. 3B).

  Also in this embodiment, for example, the cross-sectional area of the supply path 70 is adjusted according to the distance of the gate 24 from the sprue 29, and the supply amount of the molten resin supplied into the cavity 20 from each gate 24 is made uniform. Can do. Thereby, also in a present Example, the effect similar to the golf ball shaping die 10 of a 1st Example can be acquired.

  Further, in the present embodiment, by providing one adjusting means 60 for each gate 24, the amount of molten resin supplied from each gate 24 into the cavity 20 can be made even more uniform. it can. For this reason, also in this embodiment, the same effects as those of the golf ball molding die 10 of the first embodiment can be obtained, the molding accuracy of the golf ball 40 can be further increased, and the air omission is defective. It is possible to further suppress production defects due to the above.

  Furthermore, in the present embodiment, even if the cover material is changed, it is possible to cope with it by changing the setting of each adjusting means 60 according to the melt index of the cover material without changing the mold. And the same effects as those of the first embodiment described above can be obtained.

  In the present embodiment, the adjustment means 60 has the same configuration as that of the first embodiment, but the present invention is not limited to this, and the second embodiment has a configuration of the adjustment means 60a. Also good.

The method for manufacturing the golf ball 40 using the golf ball molding die 10b of this embodiment is the same as the method for manufacturing the golf ball 40 using the golf ball molding die 10 of the first embodiment, and the details thereof are as follows. Description is omitted.
Also in this embodiment, the amount of the molten resin supplied into the cavity 20 from each gate 24 in advance is made uniform by changing the screwing amount of the adjusting member 64 of the adjusting means 60 in advance. Next, the golf ball is molded in this state. Thereby, the golf ball 40 similar to that of the first embodiment can be formed, and the same effect as that of the first embodiment can be obtained.
In addition, the method of making the supply amount of the molten resin from each gate 24 uniform is the same as in the first embodiment in that the accuracy of molding of the manufactured golf ball (roundness or uniformity of cover thickness) is increased. The method of obtaining and adjusting the adjusting means 60 (a method of changing the amount of screwing between the adjusting member 64 and the internal thread portion 62) can be mentioned. However, it is not limited to this.

  In the present invention, the number of adjusting means is not limited as long as the amount of molten resin supplied from each gate into the cavity can be made uniform, and the arrangement of cavities, gates, runners, and the like is not limited. Thus, the number and arrangement position of the adjusting means may be appropriately selected.

  The golf ball molding die and golf ball of the present invention have been described above. However, the present invention is not limited to the above-described embodiment, and various improvements or modifications are made without departing from the gist of the present invention. Of course, it's also good.

1 is a schematic perspective view showing a golf ball molding die according to a first embodiment of the present invention. (A) is a principal part enlarged view which shows the gate and retracting groove part of the golf ball molding die of a present Example, (b) is a model which shows the movable pin of the golf ball molding die of a present Example. FIG. (A) is a schematic top view which shows the closed state of the golf ball molding die of a present Example, (b) is a schematic diagram which shows the closed state of the golf ball molding die of a present Example. FIG. (A) is typical sectional drawing which shows the adjustment means of the golf ball shaping | molding die concerning the 1st Example of this invention, (b) is principal part fragmentary sectional drawing of Fig.4 (a). is there. 1 is a schematic plan view showing a lower mold of a golf ball molding die according to a first embodiment of the present invention. (A) is a typical top view which shows the state at the time of the cover shaping | molding in the golf ball shaping die of a present Example, (b) is the time of the cover shaping | molding in the golf ball shaping die of a present Example. It is a typical sectional side view which shows a state. (A) is sectional drawing which shows the golf ball which concerns on the 1st Example of this invention, (b) is a schematic diagram which shows the dimple pattern of the golf ball concerning 1st Example of this invention. . It is typical sectional drawing which shows the golf ball shaping die concerning the 2nd example of the present invention, and (b) shows the pin group used for the adjustment means of the golf ball shaping die of this example. It is a schematic diagram, (c) is a fragmentary sectional view of the main part of FIG. 8 (a). FIG. 5 is a schematic plan view showing a golf ball molding die according to a third embodiment of the present invention. FIG. 6 is a schematic cross-sectional view showing a conventional golf ball molding die. It is a schematic diagram showing a dimple pattern of a conventional golf ball.

Explanation of symbols

10, 10a, 10b Golf ball molding die 12 Upper die 12a, 16a Mating surface 14, 14a Groove 16 Lower die 20, 20a, 20b Cavity 21a, 21b Air vent 22 Protrusion 24 Gate 26 Retraction groove (retraction portion)
27, 72 Runner 27 b Bottom surface 29, 29 a Spru 30 Movable pin 30 a Tip portion 26 a, 30 b Slope 32 Linear movement mechanism 34 Movable rod 36 Connecting member 38 Storage unit 40 Golf ball 42, 44 Dimple 50 Core 52 Cover 60, 60 a Adjusting means 62 Female thread portion 64 Adjustment member 66 Recessed portion 68 Adjustment pin group 68a to 68d Adjustment pin 70 Supply path 100 Golf ball molding die (die)
102 Upper mold 104 Lower mold 106 Cavity 106a Pole 108 Gate 110 Support pin 112 Core 120 Golf ball 122 Dimple PL Parting line

Claims (6)

A golf ball having a cover formed on the surface of the core and having dimples formed on the surface of the cover is formed, and a hemispherical cavity having a convex portion corresponding to the dimple is provided. A golf ball molding die having a pair of molds for molding a golf ball into two parts,
At least three gates provided in at least one of the pair of molds or a portion where the pair of molds are combined, and connected to the cavity to supply a molten resin for molding the cover in the cavity;
A retracting portion provided to be connected to the gate at a position that does not interfere with the supply of the molten resin in each gate;
A movable pin provided so as to be movable in the retracting portion and the gate, and an end portion of which enters the cavity;
An adjustment means for adjusting the supply amount of the molten resin supplied into the cavity from each gate, for each gate;
The movable pin has the shape of a convex portion corresponding to the shape of the dimple at the end portion,
When the molten resin is supplied into the cavity, the movable pin is retracted to the retracting portion, and after the molten resin is supplied into the cavity, the movable pin is moved toward the cavity, and the movable pin is moved to the cavity. A golf ball molding die, wherein a dimple is formed by an end portion entering the cavity. The adjusting means includes a supply path for supplying the molten resin to each gate, and at least one threaded portion formed in the supply path so that the molten resin extends in a direction orthogonal to the supply direction toward the cavity. An adjustment member that is screwed into the female screw portion and is capable of moving back and forth in the supply path,
2. The golf ball molding die according to claim 1, wherein the adjusting means adjusts a supply amount of the molten resin supplied from the gates into the cavity by a screwing amount of the adjusting member.   In the adjusting means, the same number of the female screw portions as the gates are formed on the upstream side in the supply direction of the gates, and the adjusting members are screwed into the female screw portions. The golf ball molding die according to claim 2. The adjustment means includes a supply path for supplying the molten resin to each gate, and at least one recess formed in the supply path so that the molten resin extends in a direction orthogonal to a supply direction toward the cavity. An adjustment pin group comprising a plurality of adjustment pins with different lengths inserted into the recess,
2. The golf according to claim 1, wherein the adjusting means adjusts a supply amount of the molten resin supplied from the gates into the cavity by inserting any of the adjusting pins of the adjusting pin group into the recess. Ball mold.   The adjusting means is formed such that the recesses are formed on the upstream side in the supply direction of the gates, and the same number of the recesses is formed for each of the gates. The golf ball molding die according to claim 4, which is inserted. A golf ball having a cover formed on the surface of the core, and dimples formed on the surface of the cover,
A golf ball, which is formed by the golf ball molding die according to any one of claims 1 to 5.

Images