JP5238845B2 - Slide core device - Google Patents

Description

  The present invention relates to a slide core device that includes a slide core and drives the slide core.

  In general, when forming an undercut part using a slide core when performing multicolor molding, in order to maintain the shape of the undercut part, the slide core is maintained in a closed position through molding for each color, When the molding is complete, the slide core is opened.

  As a technique for realizing the driving of such a slide core, for example, Patent Document 1 describes a slide core device for multicolor molding having a movable wall urged from the rear surface so as to be swingable by a spring on the slide core. Has been. In this apparatus, when forming the first color, the slide core is moved to the closed position without interference between the press cam and the movable wall due to the cam surface of the press cam descending together with the primary molding die.

  When molding the second color, the angular cam that descends with the mold for secondary molding comes into contact with the movable wall and swings the movable wall against the urging force. The inclined cam surface on the front side of the cam is brought into contact with the inclined surface of the slide core to maintain the slide core in the closed position. When the molding of the second color is completed, the movable wall returned by the urging force is pressed by the rear inclined cam surface of the angular cam that rises together with the secondary molding die, and the slide core is opened.

  Further, Patent Document 2 describes a slide core operating device that reduces the weight of a mold by incorporating a small cam straddling between a fixed side template and a slide core attached to a movable side template. ing. This cam is swingably attached to the fixed side template, and when the slide core is opened, it is swung against the urging force by the slide core, and the engagement position relationship between the slide core and the cam is closed when the mold is closed. It has a function to maintain up to.

JP 2007-296773 A No. 7-56182

  However, according to the slide core device of Patent Document 1, since the movable wall is urged on the slide core so as to be swingable by a spring, the configuration of the slide core becomes complicated. Therefore, it is not suitable for applications that require a simple structure of the slide core.

  Further, the slide core operating device of Patent Document 2 includes a push pin for applying a biasing force to the cam from the outside of the cam, and a mechanism such as a spring and a plug on the outside of the cam. Therefore, the structure of the device is complicated and large. Has the disadvantage of becoming.

  An object of the present invention is to provide a slide core device that is compact and has a simple slide core configuration in view of the problems of the prior art.

  The slide core device of the present invention includes a slide core that can move between an open position and a closed position, a guide rail that guides the lower part of the slide core in the opening and closing direction of the slide core, and predetermined upper and lower positions. The slide core includes a first inclined surface facing the opening direction and the upward direction, and a stepped portion projecting from a side surface along the opening and closing direction. Of the surfaces constituting the step, the surface that is parallel to the first inclined surface and faces downward in the closing direction of the slide core is a second inclined surface, and the cam member is A swinging member that swings in the width direction of the cam member; and a swinging member that swings in the width direction of the cam member. The swinging shaft moves along the opening / closing direction. And the lower end is biased toward the inside of the cam member, and the swinging member includes the second inclined surface when the cam member moves to the upper position. And a second cam surface is provided to move the slide core from the closed position to the open position. When the slide core is located at the closed position, the cam member is moved from the upper position to the lower position. Then, the swing member climbs over the step portion of the slide core against the biasing force, and the second cam surface faces the second inclined surface.

  According to this, since it is only necessary to provide the slide core with the first inclined surface and the stepped portion having the second inclined surface, the configuration of the slide core can be simplified. The swinging member has a swinging shaft positioned above the cam member along the opening and closing direction of the slide core, and the second cam surface is over the stepped portion of the slide core and the second cam surface is a second inclined surface in a predetermined case. Therefore, the slide core device can be made compact.

  Further, the slide core device can be easily applied to multicolor molding. That is, when the cam member is moved from the upper position to the lower position together with the upper mold for molding the second color with respect to the slide core positioned at the closed position after the first color molding is completed, the first cam surface is While acting on a 1st inclined surface and maintaining a slide core in a closed position, a 2nd cam surface gets over the level | step-difference part of a slide core, and opposes a 2nd inclined surface. When the molding of the second color is completed and the cam member is moved from the lower position to the upper position together with the upper mold, the second cam surface acts on the second inclined surface, and the slide core is also opened.

  In the present invention, another cam member having a third cam surface corresponding to the first inclined surface is provided, and when the slide core is located at the open position, the other cam member is at a predetermined upper position. The third cam surface may act on the first inclined surface to move the slide core to the closed position.

  According to this, when molding the first color, the upper mold for molding the first color and the other cam member fixed thereto are used, and when molding the second color, the upper mold for molding the second color. And the cam member having the above-described swinging member fixed thereto, two-color molding can be performed without any trouble.

  Furthermore, in the present invention, the guide rail may be provided with a ball plunger for positioning the slide core in the open position and the closed position when guiding the slide core. According to this, when the slide core is moved to the open position and the closed position, the slide core can be reliably fixed at that position.

It is a perspective view of a slide core of a slide core device concerning one embodiment of the present invention. It is a perspective view of the guide rail of the said slide core apparatus. It is a perspective view of the primary molding cam of the slide core device. It is a perspective view of the secondary forming cam of the slide core device. FIG. 5 is an exploded view of the secondary forming cam of FIG. 4. It is a figure which shows operation | movement of the said slide core apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 are perspective views of a slide core 1, a guide rail 2, a primary molding cam 3, and a secondary molding cam 4 that constitute a slide core device according to an embodiment of the present invention.

  The slide core 1 is a direction in which the slide core 1 is opened (hereinafter referred to as “open direction”) and an inclined surface 11 facing upward, and a direction in which the slide core 1 is closed (hereinafter referred to as “close direction”). And an inclined surface 12 facing downward. The inclined surface 12 is formed on a surface that forms a step of each stepped portion 14 such as a ridge protruding from both side surfaces 13 along the opening and closing direction of the slide core 1. The surface of each stepped portion 14 opposite to the inclined surface 12 constitutes both end portions of the opening direction side end surface of the slide core 1. An inclined surface 11 is formed by the end surface on the opening direction side.

  On the bottom surface of the slide core 1, a rail-shaped guided portion 15 that is guided by the guide rail 2 in the opening / closing flat direction is provided. The closing direction side of the slide core 1 serves as a fixing portion 16 to which a mold portion for product molding (not shown) is fixed.

  The guide rail 2 has a structure in which a rail portion 21 having a cross-sectional shape suitable for guiding the guided portion 15 of the slide core 1 is provided on the upper surface side of a rectangular parallelepiped member. A ball plunger 22 for positioning the slide core 1 at an open position (hereinafter referred to as “open position”) and a closed position (hereinafter referred to as “closed position”) is provided at the center of the bottom surface of the rail portion 21. Is provided. As shown in FIG. 6, corresponding concave portions 17 a and 17 b are provided on the bottom surface of the guided portion 15 of the slide core 1.

  The primary molding cam 3 has a structure in which a step is provided on the lower surface of a rectangular parallelepiped member, and the step surface is a cam surface 31 that acts on the inclined surface 11 of the slide core 1. The primary molding cam 3 is fixed to an upper mold for primary molding and moves between a predetermined upper position and lower position integrally with the upper mold. When the slide core 1 is located at the open position, when the primary molding cam 3 is moved from the upper position to the lower position, the cam surface 31 acts on the inclined surface 11 and moves the slide core 1 to the closed position.

  The secondary molding cam 4 is fixed to an upper mold for secondary molding (not shown), and is moved between a predetermined upper position and lower position integrally with the upper mold. The secondary forming cam 4 acts on the inclined surface 11 by moving to the lower position to place the slide core 1 in the closed position, and acts on the inclined surface 12 when moving to the upper position to move the slide core. The cam surface 42 which moves 1 from a closed position to an open position, and the two rocking | swiveling members 43 with which the cam surface 42 was provided are provided.

  FIG. 5 is an exploded view of the secondary molding cam 4. As shown in the figure, each swing member 43 is heat resistant so that the axis of swinging is located on both sides of the upper part of the secondary molding cam 4 along the opening and closing direction, and the lower ends thereof have a predetermined interval. The plate spring 44 is urged inward. This interval is substantially equal to the interval between both side surfaces 13 of the slide core 1.

  That is, each swing member 43 includes a partial cylindrical portion 45 whose axis is along the opening and closing direction inside the upper end portion. Correspondingly, the main body portion 46 of the secondary molding cam 4 has receiving portions 47 on both sides of the upper portion for receiving the partial cylindrical portion 45 and supporting it in a swingable manner.

  Each swing member 43 arranges each partial cylindrical portion 45 in each receiving portion 47, and arranges the leaf springs 44 so that the concave portions 48 at the upper ends of the receiving portions 47 are pressed by both end portions of the leaf springs 44, It is covered by a plate 49 and attached by fastening the leaf spring 44 and the plate 49 to the main body 46 with a screw 50. As a result, the lower end of each swing member 43 is urged by the leaf spring 44 so as to have an interval of about the interval between the side surfaces 13 of the slide core 1.

  The lower end of each swinging member 43 and the upper end of each stepped portion 14 of the slide core 1 are chamfered so that each swinging member 43 can be easily fitted to the outside of each stepped portion 14.

  FIG. 6 shows the operation of the slide core device when performing two-color molding. FIGS. 6A to 6D show the slide core device viewed from the side. 6 (e) to 6 (i), in addition to the state seen from the side surface side, the state seen from the closing direction side is shown together with a part as a cross section. The slide core 1 is positioned via the recess 17a by the ball plunger 22 when positioned at the open position, and is positioned via the recess 17b when positioned at the closed position.

  In the two-color molding, first, as shown in FIG. 6A, the primary molding cam 3 fixed to the upper primary mold for clamping is moved together with the upper mold from a predetermined upper position. The slide core 1 is moved downward toward the slide core 1 located at the open position on the guide rail 2. Accordingly, as shown in FIG. 6B, the cam surface 31 acts on the inclined surface 11 of the slide core 1 to move the slide core 1 toward the closed position.

  When the primary molding cam 3 reaches the lower position, the slide core 1 is positioned at the closed position as shown in FIG. Thus, the mold clamping is completed, and in this state, the molding agent for primary molding is injected. Thereafter, when the mold is opened, the primary molding cam 3 is moved to the upper position together with the upper mold as shown in FIG. Thereafter, the ball plunger 22 keeps the position of the slide core 1 in the closed position until the secondary molding is clamped.

  Next, in order to perform secondary molding, as shown in FIG. 6 (e), the secondary molding cam 4 fixed to the upper mold for secondary molding (not shown) is moved downward from a predetermined upper position. Toward the position, the slide core 1 is lowered toward the closed position on the guide rail 2. Along with this, as shown in FIG. 6 (f), the swing member 43 gets over each stepped portion 14 of the slide core 1 against the urging force of the leaf spring 44.

  When the secondary molding cam 4 reaches the lower position, the cam surface 41 acts on the inclined surface 11 to maintain the slide core 1 in the closed position and the cam of the swing member 43 as shown in FIG. The surface 42 faces the inclined surface 12 of the slide core 1. Thus, the mold clamping for the secondary molding is completed, and the molding agent for the secondary molding is injected in this state.

  During this time, the slide core 1 is maintained in the closed position by the cam surface 41 against the injection pressure of the molding agent. Thereafter, when the mold is opened, the secondary molding cam 4 is moved to the upper position together with the upper mold.

  Accordingly, as shown in FIG. 6H, the cam surface 42 acts on the inclined surface 12 of the slide core 1 and moves the slide core 1 toward the open position. As shown in FIG. 6 (i), when the secondary molding cam 4 reaches the upper position, the slide core 1 is positioned at the open position. This completes mold opening.

  As described above, according to the present embodiment, as the configuration for moving the slide core 1 in the opening / closing direction, the slide core 1 only needs to be provided with the inclined surface 12 and the inclined surface 11, and thus the configuration of the slide core 1. Can be simplified.

  Further, the swing member 43 has a plate shape along the side surface of the secondary molding cam 4, and when combined with the slide core 1, the stepped portion 14 and the swing member 43 constitute substantially the same surface. And since it is a substantially rectangular form as a whole, a slide core apparatus can be made compact.

  When the secondary molding cam 4 is lowered from the upper position toward the lower position toward the slide core 1 located at the closed position, the cam surface 41 acts on the inclined surface 11 to close the slide core. Since the rocking member 43 gets over each step 14 of the slide core 1 and the cam surface 42 of the rocking member 43 faces the inclined surface 12 of the slide core 1, secondary molding and thereafter The mold can be opened without any trouble.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case of performing two-color molding has been described. However, the present invention is not limited to this, and the present invention can also be used to advance and retract a holding member that positions and holds an insert product during insert molding. .

  DESCRIPTION OF SYMBOLS 1 ... Slide core, 2 ... Guide rail, 3 ... Primary molding cam (another cam member), 4 ... Secondary molding cam (cam member), 11 ... Inclined surface (1st inclined surface) ), 12 ... inclined surface (second inclined surface), 14 ... stepped portion, 31 ... cam surface (third cam surface), 41 ... cam surface (first cam surface), 42 ..Cam surface (second cam surface), 43...

Claims (3)

A slide core movable between an open position and a closed position;
A guide rail for guiding the lower part of the slide core in the opening and closing direction of the slide core;
A cam member moved between a predetermined upper position and a lower position,
The slide core includes a first inclined surface facing upward in the opening direction, and a stepped portion protruding from the side surface along the opening and closing direction,
Of the surfaces constituting the step of the stepped portion, the surface that is parallel to the first inclined surface and faces downward in the closing direction of the slide core is a second inclined surface,
The cam member acts on the first inclined surface by moving to the lower position to place the slide core in a closed position; and a swing member swinging in the width direction of the cam member; With
The swing member has a swing shaft positioned above the cam member along the opening and closing direction, and a lower end is biased toward the inside of the cam member,
The swing member is provided with a second cam surface that acts on the second inclined surface to move the slide core from the closed position to the open position when the cam member moves to the upper position,
When the cam member is moved from the upper position to the lower position when the slide core is in the closed position, the swinging member climbs over the stepped portion of the slide core against the biasing force, and A slide core device, wherein two cam surfaces oppose the second inclined surface. Another cam member provided with a third cam surface acting on the first inclined surface;
When the slide core is located at the open position and the another cam member is moved from a predetermined upper position to a lower position, the third cam surface acts on the first inclined surface, and the slide core is closed. The slide core device according to claim 1, wherein the slide core device is moved to a position.   The slide core device according to claim 1 or 2, wherein the guide rail is provided with a ball plunger for positioning the slide core in an open position and a closed position when guiding the slide core. .

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