JP4763007B2 - Injection molding machine - Google Patents

Description

  According to the present invention, a locating ring mounting hole is provided on the fixed platen, and a locating ring is detachably provided on the outer peripheral portion of the sprue bushing on the stationary mold, and the locating ring is connected to the locating ring mounting hole. The present invention relates to an injection molding machine in which, when the fixed mold is attached to the fixed plate in the inserted state, the fixed mold is attached to the fixed plate in a centered manner.

  As shown in FIG. 2, the mold for an injection molding machine includes a fixed plate 30, a movable plate 40 that is opened and closed with respect to the fixed plate 30, a fixed plate 30 and a movable plate 40. .. Are attached to the stationary platen 30 and the movable side die 41 is detachably attached to the movable platen 40, respectively. ing. A sprue bush 32 is provided in the fixed mold 31, and a locating ring 33 is fitted to the end of the sprue bush 32 facing the fixed plate 30. A locating ring mounting hole 36 into which the locating ring 33 is fitted is formed at a predetermined position of the fixed plate 30. On the parting surfaces of the fixed side mold 31 and the movable side mold 41, a runner 43 communicating with the sprue 34 of the sprue bush 32 is provided, and this runner 43 communicates with a molding cavity through a gate (not shown). ing.

  Therefore, when the movable platen 40 is clamped with respect to the fixed platen 30, the nozzle of the injection machine is touched to the fitting portion 33 of the sprue bush 32 of the fixed side die 31, and the molten resin is injected, the molten resin is sprung. The cavity is filled from 34 through the runner 43. When the movable mold 41 is opened after cooling and solidification, a molded product is obtained.

  Although it can be molded in this manner, when the fixed-side mold 31 is newly attached to the fixed platen 30 or replaced, it is attached in a state of being positioned by the locating ring 33. That is, the fixed mold 31 is fixed to the fixed plate 30 so that the locate ring 33 provided on the sprue bush 32 of the fixed mold 31 fits in the locate ring mounting hole 36 formed in the fixed plate 30. When attached, the locating ring 33 is attached in a state of being positioned or aligned.

  Such a locating ring or a locating ring mounting structure is not a direct prior art document of the present invention, but various proposals are made, for example, in Patent Documents 1 to 3 and the like.

Japanese Patent Laid-Open No. 9-1598 JP 2001-105455 A JP 2006-27119 A

The locating ring shown in Patent Document 1 is provided on a sprue bush of a fixed mold so as to be movable in the axial direction, and its outer peripheral part is expanded in a stepped shape on the side facing the injector side. Since this locating ring has a stepped outer diameter, it can be used for multiple types of injection molding machines, and the locating ring is provided on the sprue bush so as to be movable in the axial direction. There is an advantage that the nozzle of the injection molding machine can be accurately positioned.
Patent Document 2 shows a square locating ring, and correspondingly, a locating ring mounting hole of a stationary side platen is also formed in a square shape. Since the locating ring is square in this way, it is recognized that the positioning is easy when the fixed side mold is attached, and the effect of shortening the time for exchanging the mold can be recognized.
The locate ring described in Patent Document 3 is composed of four locate ring pieces. The positions of the screw holes for attaching these pieces are different in the radial direction. Therefore, even when the mounting positions of the four locating pieces are changed and the inner diameters of the locating ring mounting holes of the fixed plate are different, it is possible to cope.

  A certain effect is recognized also by the invention described in each of Patent Documents 1 to 3. However, the conventional locating ring as described above cannot cope with a change in the thickness of the fixed side mold or the movable side mold. More specifically, the mold temperature during injection molding is generally maintained at 15 to 80 ° C., but depending on the type of resin, molding may be performed at 80 ° C. or higher. When molding at such a high temperature, heat conduction is performed by interposing a heat insulating material on the contact surface S of the fixed plate 30 and the fixed mold 31 and the contact surface S of the movable plate 40 and the movable mold 41. Heat dissipation is prevented by Although such a heat insulating material is comparatively thin like 5-10 mm, it cannot respond by the locate ring 33 when there is no heat insulating material. Therefore, conventionally, a dedicated locating ring for a heat insulating material is separately prepared. Thus, if a dedicated locating ring is prepared, a heat insulating material can be interposed, but there is a disadvantage that two types of locating rings are required and the cost is increased. Further, when one locating ring is used, the other locating ring must be stored so as not to be lost.

  An object of the present invention is to provide a mold for an injection molding machine having a locating ring that eliminates the above-mentioned drawbacks, and specifically, a plate-like heat insulating material or a good heat conductor with a single locating ring. It is an object of the present invention to provide an injection molding machine that can be installed and that does not have the trouble of managing the locating ring.

  In the present invention, in order to achieve the above object, the locating ring is integrally composed of a large-diameter portion having a large outer peripheral diameter and a small-diameter portion. When the heat insulating material is not used, the large diameter side faces the fixed mold, and when the heat insulating material is used, the small diameter side faces the fixed mold. Corresponding to the locating ring having such a special shape, the rocket ring mounting hole of the fixed platen has a large-diameter hole in the portion facing the fixed mold and a small-diameter hole on the opposite side. The fixed side mold is positioned mainly by fitting the large diameter part of the locating ring and the large diameter hole of the fixed platen. The small diameter hole is a clearance hole of the small diameter part of the locating ring when no heat insulating material is used. It has become.

  That is, in order to achieve the above object, the present invention is provided with a locating ring mounting hole on the fixed platen, and a locating ring is detachably provided on the outer periphery of the sprue bushing on the stationary mold, In a state where a locating ring is inserted into the locating ring mounting hole, when the fixed side mold is mounted on the fixed platen, the fixed side mold is mounted on the fixed plate in a centered manner. The locating ring includes a large-diameter portion having a large outer peripheral diameter and a small-diameter portion having a smaller diameter than the large-diameter portion, and the large-diameter portion is located toward the fixed-side mold. The locating ring mounting hole is configured such that the large diameter portion of the locating ring is configured to take a first position and a second position where the small diameter portion is located toward the fixed mold. A large-diameter hole that fits, and the location When the ring takes the first position, the locating ring has a small-diameter hole in which the small-diameter portion of the locating ring is accommodated. The large-diameter hole is located on the end face side to which the fixed mold is attached, and the small-diameter hole It is comprised so that it may be located inside.

  As described above, according to the present invention, the locating ring includes a large-diameter portion having a large outer peripheral diameter and a small-diameter portion having a smaller diameter than the large-diameter portion, and the large-diameter portion is the fixed-side mold. The locating ring mounting hole is configured to have a first position located toward the first position and a second position where the small diameter portion is located toward the fixed-side mold. A large-diameter hole into which the large-diameter portion fits and a small-diameter hole into which the small-diameter portion of the locating ring fits when the locating ring is in the first position. Since the small-diameter hole is located inside the large-diameter hole, it is also possible to attach the fixed side mold directly to the fixed plate with the locate ring as the first position. Between the fixed mold and the fixed platen with the second position For example it can be attached by interposing a plate-like insulation material, the effect peculiar to obtain the present invention as. That is, it can be used in two ways by one type of locate ring. Therefore, an injection mold can be provided at a low cost. Further, the number of locating rings increases, and locating rings that are not used are not lost. At this time, according to the present invention, when the locating ring takes the first position or the second position, the large-diameter portion fits into the large-diameter hole on the stationary platen side. Always positioned. Therefore, when the mold is clamped without a core, the locate ring, sprue bush, etc. are damaged, but such damage is not caused.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. (A) in FIG. 1 is a cross-sectional view showing the main part when the heat insulating material is not used, and (c) when the heat insulating material is used. It is sectional drawing which expands and shows a form. The locating ring 1 according to the present embodiment includes a first end face 2 located on the left side in FIG. 1A, a second end face 3 located on the right side, an outer peripheral part 4, and an inner peripheral part. 5 so as to have a substantially ring shape as a whole.

  The first end surface 2 is a portion that contacts the end surface of the fixed mold 20 when a plate-shaped heat insulating material 25 described later is not used, and the second end surface 3 is a fixed mold when the heat insulating material 25 is used. 20 is a part in contact with a part of the end face. The outer peripheral portion of the first end surface 2 is a large diameter portion 6, and the outer peripheral portion of the second end surface 3 is a small diameter portion 7. The height or thickness D of the small-diameter portion 6 is substantially equal to the thickness 5 to 10 mm of the heat insulating material 25, and a through-hole of a plate-shaped heat insulating material 25 to be described later enters the small-diameter portion 7. Yes. Further, a sprue bush 21 described later is detachably fitted to the inner peripheral portion 5.

  As shown in FIG. 1A, the fixed platen 10 is provided with a notch 11 in which an injection nozzle of an injection molding machine is inserted at a substantially central portion so as to cross the fixed platen 10. ing. A locating ring mounting hole 12 is formed on the mounting surface side of the fixed mold 20 at a position where the notch 11 is recessed. In FIG. 1A, the locating ring 1 is shown on the lower side, but the locating ring 1 is omitted and the locating ring mounting hole 12 is shown on the upper side. The mounting hole 12 is formed corresponding to the shape of the locating ring 1 described above, and a large-diameter hole 13 opened on the mounting surface side of the fixed mold 20 and a flange or inside of the large-diameter hole 13. It consists of a small diameter hole 14. The large-diameter portion 6 of the locate ring 1 is fitted into the large-diameter hole 13, and the locate ring 1 is positioned. That is, the fixed side mold 20 is positioned. The small diameter hole 14 is a hole into which the small diameter portion 7 of the locating ring 1 is fitted or a hole through which the small diameter portion 7 is released.

  A sprue bush 21 is provided on the stationary mold 20 attached to the stationary platen 10 so as to cross the mold 20. The above-described locate ring 1 is detachably fitted to the tip of the sprue bush 21. Although not shown in FIG. 1, a movable platen associated with the fixed platen 10 is provided, and a movable side mold is attached to the movable platen. A cavity for obtaining a molded product is formed on the parting surfaces of the fixed side mold 20 and the movable side mold, and the sprue 22 of the sprue bush 21 communicates with the cavity through a conventionally known runner, gate, or the like.

  The operation of the above embodiment will be described. When the heat insulating material 25 is not used, the locating ring 1 is fitted to the front end portion of the sprue bush 21 with the first end face 2 first as shown in FIG. Then, the fixed-side mold 20 is attached to the fixed platen 10 as conventionally known. At this time, the locating ring 1 enters the locating ring mounting hole 12 of the stationary platen 10. The large-diameter portion 6 of the locating ring 1 fits into the large-diameter hole 14 of the mounting hole 12, and the small-diameter portion 7 fits or fits into the small-diameter hole 14. As a result, the mounting surface of the fixed platen 10 and the first end surface 2 of the locating ring 1 become the same surface, and the fixed mold 20 is positioned and attached to the fixed platen 10. At this time, the positioning is mainly performed by fitting the large-diameter portion 6 of the locating ring 1 with the large-diameter hole 14 of the stationary platen 10, and the small-diameter portion 7 escapes into the small-diameter hole 14. When a nozzle of an injection machine (not shown) is touched to the fitting portion 23 of the sprue bush 21, the molten resin is injected into the cavity as described above, and after waiting for cooling and solidification, the movable mold is opened to obtain a molded product. .

  When the plate-like heat insulating material 25 is used, a through hole of the heat insulating material 25 is inserted into the outer peripheral portion of the sprue bush 21 as shown in FIG. Then, this time, the locating ring 1 is turned over, that is, fitted to the sprue bush 21 with the second end face 3 of the locating ring 1 first. If it does so, the through-hole of the heat insulating material 25 comes to be located in the small diameter part 7 of the locating ring 1. The fixed mold 20 is attached to the fixed plate 10 as described above. Then, since the small diameter portion 7 of the locating ring 1 protrudes by substantially the same thickness as the heat insulating material 25, the surface of the heat insulating material 25 facing the fixed mold 20 and the second end surface 3 of the locating ring 1 are It becomes substantially the same surface. The heat insulating material 25 is positioned on the outer peripheral portion of the small diameter portion 7 of the locate ring 1, and the large diameter portion 6 of the locate ring 1 is fitted and positioned in the large diameter hole 13 of the locate ring mounting hole 12. The state where the heat insulating material 25 is attached in this manner is shown in FIG. Since there is no locate ring in the movable mold, it is not specifically explained, but it is possible to easily attach the heat insulating material. Obviously, the heat insulating material 25 can be injection-molded in substantially the same manner even when the heat insulating material 25 is attached between the fixed plate 10 and the fixed mold 20 and between the movable plate and the movable mold.

  When molding in a state where the mold temperature is low, a plate-shaped heat good conductor is interposed between the fixed plate and the fixed die and between the movable plate and the movable die, and the heat of the die It can be molded while letting go.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the metal mold | die which concerns on embodiment of this invention, The (a) is the front view which shows the state which attached the stationary side metal mold | die to the stationary platen, without using a heat insulating material, (A) is an enlarged cross-sectional view of a locate ring, and (c) is a front view showing a state in which a heat-insulating material is used and a stationary mold is attached to a stationary platen, partially in cross section. It is sectional drawing which shows the metal mold | die attached to the conventional injection molding machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Locating ring 2 1st end surface 3 2nd end surface 6 Large diameter part 7 Small diameter part 10 Fixed board 12 Locating ring mounting hole 13 Large diameter hole 14 Small diameter hole 20 Fixed side metal mold 21 Sprue bush 25 Thermal insulation

Claims (1)

A locating ring mounting hole is provided on the fixed platen, and a locating ring is detachably provided on the outer periphery of the sprue bushing on the fixed mold,
When the fixed mold is attached to the fixed plate in a state where the locate ring is inserted into the locate ring mounting hole, the fixed mold is attached to the fixed plate in a centered manner. Machine,
The locating ring includes a large-diameter portion having a large outer peripheral diameter and a small-diameter portion having a smaller diameter than the large-diameter portion, and the large-diameter portion is located on the fixed side mold. And is configured to take a position and a second position where the small diameter portion is located toward the fixed mold,
The locating ring mounting hole includes a large-diameter hole into which the large-diameter portion of the locating ring fits, and a small-diameter hole into which the small-diameter portion of the locating ring fits when the locating ring is in the first position. Is an injection molding machine provided with a locating ring, which is located on an end face side to which the fixed mold is attached, and the small diameter hole is located inside the large diameter hole.

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