JP3704118B2 - Sliding core slide mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slide mechanism for sliding an oblique slide core provided for molding an undercut portion of a product in an injection mold when the product is removed from the mold.
[0002]
[Prior art]
When a product molded with an injection mold has an undercut portion, if the product is struck straight with a knockout pin after opening the mold, the undercut portion is caught and the product cannot be removed from the mold. Therefore, a portion corresponding to the undercut portion inside the mold is provided separately as a slide core, and the slide core is slid out of the undercut portion when the product is taken out. FIG. 11 shows an oblique slide mechanism of a conventional general slide core. As shown in FIG. 11 (a), a slide is made on a part of the lower mold plate 3 to form an undercut portion 11. As shown in FIG. A core 1 is provided, and a projecting rod 2 is fixed to the lower end of the slide core 1, and the projecting rod 2 is inserted and guided through an inclined guide hole 4 of the template 3. The lower end of the projecting rod 2 is fixed to a slider 7 that is slidably guided on the ejector plate 5 in a lateral direction. When the product 12 is removed from the mold, as shown in FIG. 11 (b), the ejector plate 5 is moved toward the mold plate 3 so that the slide core 1 moves upward while moving to the left and the undercut portion. 11, the product 12 is detached from the template 3. In the illustrated example, the guide member 8 for guiding the slider 7 is formed as a separate member on the ejector plate 5. However, the ejector plate 5 is usually formed by stacking the upper plate and the lower plate, and the ejector plate 5. In many cases, the upper plate and the guide member 8 are combined.
[0003]
If the slide core 1 is not held at an accurate height when the mold is clamped (the state shown in FIG. 11 (a)), an error may occur in the shape of the undercut portion 11, and burrs and steps may occur in the product. Such a problem occurs. Referring to FIG. 12, the distance A between the mold plate 3 and the ejector plate 5 is accurately measured, but the distance Y between the slide core 1 and the ejector plate 5 is determined by the sliding mechanism because of the slanting slide. An error in processing and assembling of the constituent parts is likely to occur, and it is difficult to accurately obtain the dimensions. In particular, in a mold for molding a plurality of products at a time, the heights y1, y2, and y3 of the plurality of slide cores 1 vary and must be individually adjusted so as to have predetermined dimensions. In the figure, the error is exaggerated for easy understanding, but the actual error is usually within a range of 0.3 to 0.5 mm. FIG. 13 shows an example of a structure for adjusting the height. An adjustment bush 13 having a threaded outer periphery is screwed into the slider 7 from below, and the adjustment bush 13 is turned with a wrench or the like to enter and exit. Is adjusted to change the substantial length of the protruding rod 2 to adjust the height of the slide core 1. In the figure, reference numeral 14 denotes a double nut for preventing the adjustment bush from rotating.
[0004]
[Problems to be solved by the invention]
The height adjustment of the slide core must be performed in a delicate order of a few millimeters or less, and it is difficult to make a fine adjustment with the mechanism using screws as described above, and the prototype and adjustment of the product are repeated many times. I had to. In particular, when a plurality of slide cores are provided in one mold, it is extremely difficult to accurately adjust all of them. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a slide mechanism capable of accurately obtaining the height of the slide core without adjusting each one.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a slide in which a projecting rod having a slide core attached to the tip is inserted into an inclined guide hole of the template, and the proximal end side of the projecting rod is guided and held by the ejector plate. In the slanted sliding mechanism of the core, an elastic body is interposed at the connection part with the ejector plate on the proximal end side of the ejector rod, and the ejector rod is pulled toward the ejector plate side by the elastic force of the elastic body when clamping the mold. Features.
[0006]
The slant slide mechanism for a slide core according to the invention described in claim 1 is provided with a slide core attached to the tip, a projecting rod inserted through the inclined guide hole of the template, and a slider provided connected to the base end of the projecting rod When, and a guide member for slidably guiding and holding laterally slider ejector plate, the slider has a slide piece which engages the joint piece and the guide member protrudes rod is connected, the joint piece and the slide An elastic body is interposed between the pieces. When the mold is clamped, the protruding rod is pulled toward the ejector plate by the elastic force of the elastic body, and the bottom surface of the slide core is placed on the bottom surface of the recess for embedding the slide core provided on the mold plate. characterized in that the person so that. The guide member may also serve as the upper plate of the ejector plate.
[0007]
Further, the slide mechanism of the slide core according to the invention of claim 2 has a slide core attached to the tip, and is connected to a protruding rod inserted into the inclined guide hole of the template and a base end portion of the protruding rod. A slider to be provided, and a guide member that guides and holds the slider on the ejector plate so as to be slidable in the lateral direction. An elastic body is interposed between the connecting portion of the protruding rod and the slider. the pulled ejector plate side, wherein the bottom surface of the slide core has a bottom surface of the recess for embedding slide core provided in the mold plate to those so that. The guide member may also serve as the upper plate of the ejector plate.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same parts as those in the conventional example will be described with the same reference numerals. The oblique slide mechanism of the slide core according to the present invention has the same basic structure as the conventional one shown in FIG. 11, and is a portion for guiding and holding the slider 7 connected to the proximal end side of the protruding rod 2 to the ejector plate 5. There is a feature in the structure. Further, the present invention is characterized in that an elastic body such as a spring is interposed in that portion, and the protruding rod 2 is pulled toward the ejector plate 5 by the elastic force of the elastic body at the time of clamping.
[0009]
1 and 2 show a first embodiment of the present invention. A pair of guide members 8 are mounted in parallel on the ejector plate 5 with a gap therebetween, and guide grooves 15 are provided on opposing surfaces of both guide members 8 so that the slider 7 can slide in the guide grooves 15. Guidance is maintained. The slider 7 is composed of two members: a joint piece 9 to which the proximal end portion of the protruding rod 2 is connected and a slide piece 10 that engages with the guide groove 15. The joint piece 9 is connected to the projecting rod 2 with bolts 16 and then superimposed on the slide piece 10 and connected with two connecting bolts 17. The joint piece 9 is connected to the joint piece 9 around the shaft portion 18 of the connecting bolt. A spring mounting portion 19 is provided by spot facing, and a coil spring 6a is mounted thereon. Therefore, when the protruding rod 2 is pulled upward, the coil spring 6 a is contracted, and a gap is formed between the joint piece 9 and the slide piece 10. At the time of mold clamping in which the ejector plate 5 is lowered, the length of the protruding rod 2 is set so that there is a gap between the joint piece 9 and the slide piece 10 and the tensile force by the coil spring 6a acts. The size of the gap needs to be able to absorb at least processing and assembly errors that occur at the entire height of the oblique slide mechanism, but is usually sufficient if there is a stroke of about 0.3 to 0.5 mm. As shown in FIG. 3, the ejector plate 5 may be formed by stacking the upper plate 5 a and the lower plate 5 b so that the upper plate 5 a of the ejector plate also serves as the guide member 8.
[0010]
When the protruding rod 2 is pulled in this manner, the slide core 1 connected to the tip thereof is also pulled together. Therefore, as shown in FIG. 4, the slide core embedding recess provided on the template 3 is provided on the bottom surface of the slide core 1. The slide core 1 is accurately positioned at a predetermined height position. This is the same even when there are a plurality of sets of slide cores 1 and their slide mechanisms. For each of them, the coil spring 6a absorbs processing and assembly errors, and the height y of the slide core 1 becomes constant.
[0011]
Various embodiments of the present invention can be considered by changing the way of providing the elastic body. FIG. 5 shows a second embodiment of the present invention. In this embodiment, the joint piece 9 and the slide piece 10 are connected by a single connecting bolt 17, and the surface where the joint piece 9 and the slide piece 10 are in contact with each other is semicircular so that they are not displaced from each other. Grooves 21 are provided, and positioning pins 22 are inserted between the grooves 21. When the protruding rod 2 is pulled, the joint piece 9 slightly rotates with the end portion on the positioning pin 22 side as a fulcrum. Thus, when the connecting bolt 17 is made into one, there exists an advantage which can reduce the slider 7 and the guide member 8 compared with the thing of 1st Embodiment. Further, the protruding rod 2 is rotatably connected to the joint piece 9 by a shaft 23, and can be used as it is for the protruding rod 2 having a different inclination angle.
[0012]
FIG. 6 shows a third embodiment of the present invention. The joint piece 9 is accommodated in a rectangular holding part 24 provided on the slide piece 10, and rubber 6 b as an elastic body is embedded in the upper part of the joint piece 9, and this is placed on the upper surface of the holding part 24. Pressed. The holding part 24 is formed to be slightly larger than the outer shape of the joint piece 9, and when the protruding rod 2 is pulled, the joint piece 9 rotates slightly in the holding part 24.
[0013]
FIG. 7 shows a fourth embodiment of the present invention. The joint piece 9 and the slide piece 10 are connected by a single connecting bolt 17, a locking groove 25 is provided on the side surface of the joint piece 9 opposite to the connecting bolt 17, and a locking claw provided on the slide piece 10. 26 is locked in the locking groove 25.
[0014]
FIG. 8 shows a fifth embodiment of the present invention. In this embodiment, a plurality of (three in this case) joint pieces 9 are elastically held on one slide piece 10. This embodiment is convenient when a plurality of slide cores 1 are provided adjacent to each other in a narrow space.
[0015]
9 and 10 show a sixth embodiment of the present invention. In this embodiment, the base end portion of the projecting rod 2 is inserted into the upper surface side of the joint piece 9, and the screw portion 27 at the tip of the connecting bolt 17 inserted from the lower surface side of the joint piece 9 is screwed into the projecting rod 2. A coil spring 6 a is mounted between the piece 9 and the connecting bolt 17. Therefore, when the protruding rod 2 is pulled upward, it extends upward while receiving the repulsive force of the coil spring 6a. Cylindrical protrusions 28 are provided on both side surfaces of the joint piece 9, and the protrusions 28 are engaged with holes of the slide piece 10 accommodated in the guide groove 15 of the guide member 8. Therefore, the joint piece 9 moves along the guide groove 15 of the guide member 8 and rotates around the protrusion 28 as a fulcrum. The guide groove 15 is provided so as to be inclined upward and downward so that the slider 7 can slide lightly even if the protrusion rod 2 is inclined strongly.
[0016]
The present invention is not limited to the embodiment described above, and can be implemented by appropriately changing the design such as the selection of the elastic body and the holding structure thereof, the form of the joint piece and the slide piece, and the connection structure thereof.
[0017]
【The invention's effect】
The slant slide mechanism of the slide core according to the present invention includes an elastic body in a connecting portion with the ejector plate on the protruding rod base end side, and the protruding rod is pulled to the ejector plate side by the elastic force of the elastic body during mold clamping , the bottom surface of the slide core burying concave bottom surface of the slide core is provided in the template since to those so that, processing and the assembling errors elastic body absorbs, the slide core predetermined without performing troublesome adjustment Accurate positioning at the height position.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.
FIG. 2 is a view taken in the direction of arrow A in FIG.
FIG. 3 is a view showing an embodiment when the guide member is also used as the upper plate of the ejector plate.
FIG. 4 is an overall view of an oblique slide mechanism of a slide core according to the present invention.
FIG. 5 is a longitudinal sectional view showing a second embodiment of the present invention.
FIG. 6 is a longitudinal sectional view showing a third embodiment of the present invention.
FIG. 7 is a longitudinal sectional view showing a fourth embodiment of the present invention.
FIG. 8 is a longitudinal sectional view showing a fifth embodiment of the present invention.
FIG. 9 is a longitudinal sectional view showing a sixth embodiment of the present invention.
10 is a cross-sectional view taken along the line AA in FIG.
FIGS. 11A and 11B are diagrams showing the configuration and operation of an oblique slide mechanism of a general slide core. FIGS.
FIG. 12 is a diagram for explaining a problem in the oblique slide mechanism of the conventional slide core.
FIG. 13 is a longitudinal sectional view showing an example of a structure for adjusting the height of the slide core.
[Explanation of symbols]
1 Slide core 2 Extruding rod 3 Mold plate 4 Guide hole 5 Ejector plate 6a Coil spring (elastic body)
6b Rubber (elastic body)
7 Slider 8 Guide member 9 Joint piece 10 Slide piece

Claims (2)

A slide core (1) is attached to the tip, a projecting rod (2) inserted through the inclined guide hole (4) of the template (3), and a slider (7) connected to the base end of the projecting rod And a guide member (8) that guides and holds the slider on the ejector plate (5) so as to be slidable in the lateral direction. The slider is a joint piece (9) to which the projecting rod is connected, and a slide piece that engages the guide member. (10) and having a resilient body between the joint piece and the sliding piece (6a, 6b) is interposed a rod protrudes during mold clamping is pulled ejector plate side by the elastic force of the elastic body, the slide oblique slide mechanism of the slide core, wherein a bottom surface of the core is on the bottom surface of the concave portion for embedding the slide core provided in the mold plate (20) to those so that. A slide core (1) is attached to the tip, a projecting rod (2) inserted through the inclined guide hole (4) of the template (3), and a slider (7) connected to the base end of the projecting rod And a guide member (8) for guiding and holding the slider to the ejector plate so as to be slidable in the lateral direction, and an elastic body (6a) is interposed between the connecting portion of the protruding rod and the slider so that the protruding rod is elastic during mold clamping. pulled ejector plate side by the elastic force of the body, the oblique slide mechanism of the slide core, characterized in that the person so that the bottom surface of the concave portion for embedding the slide core provided in the bottom mold plate of the slide core (20).

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