JPH0436247Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a molding die for integrally molding a irregularly shaped article having an undercut portion.

(Prior art and its problems) In Fig. 1, square grooves are formed on both left and right ends 1 and 2, respectively, and method A of forming the square grooves,
B shows an article twisted at an angle α with respect to each other. In this way, the base portions of cylinders, elliptical cylinders, polygonal cylinders, rectangular parallelepipeds, etc. with grooves, small holes, convex portions, etc. are different from each other on inclined surfaces A and B (hereinafter, these surfaces are referred to as reference surfaces). For articles that are connected in series, the existence of these small holes and uneven parts creates an undercut part with respect to one reference plane A, so with a normal split mold, these parts cannot be molded in one piece. I can't do it. For this reason, conventionally, for irregularly shaped products having such an undercut part, the left and right end parts 1 and 2 have to be molded separately, and then the two parts can be joined at the subsequent part 3 by means such as adhesives or screws. In addition to requiring a large number of assembly steps and increasing production costs, there was also a quality defect in that the strength of the joints was weak.

(Means for Solving the Problems) The present invention provides an article having a shape in which base portions of various shapes having the above-mentioned grooves, small holes, convex portions, etc. are arranged in series at mutually different inclination angles, In other words, the object is to provide a molding die that eliminates the conventional drawbacks by integrally molding an article having a shape in which parts each having a plurality of reference surfaces with different slopes are connected in series. In this mold, both the first fixed side and movable mold plates are fixed to the respective mounting plates with their respective mold surfaces facing each other,
These mold surfaces form a cavity portion having a first reference surface perpendicular to the mounting plate, and second mold plates on a fixed side and a movable side are arranged adjacent to each of the first mold plates. , the respective mold surfaces are arranged so as to face each other so as to be slidable across the cavity portion in mutually opposite directions, and with these mold surfaces, the cavity portion having the second reference surface is connected to the first cavity portion. the second
One side of each of the two mold plates is formed parallel to the second reference plane, and a means for locking the movement of the second mold plates on both side walls is provided on the movable side mounting plate and the protruding plate. The gist is that a protruding pin is fixed to each of the movable mold plates and extends parallel to the reference plane of each cavity portion that penetrates each of the mold plates on the movable side and reaches the mold surface. It is something to do.

Hereinafter, details of the present invention will be explained based on embodiments shown in the drawings.

(Example 1) FIGS. 2 to 4 show a preferred embodiment of a mold for manufacturing an article having the shape shown in FIG. 1, and show the state when the mold is closed. In the figure, reference numeral 4 denotes a mounting plate on the fixed side, to which a template 5 is fixedly attached.
Further, reference numeral 6 denotes a movable side mounting plate, to which a movable side mold plate 8 is fixedly attached via a spacer 7, and its mold surface 9 is connected to the mold surface 1 of the fixed side mold plate 5. A cavity portion 1 is disposed facing the mounting plates 4 and 6 and has a reference surface perpendicular to the mounting plates 4 and 6 by means of both mold surfaces 9 and 10.
1 is formed. Fixed side and movable side templates 5,
There is another template 12, 13 on each side of 8, and a joint 1 provided on the adjacent surface with each template.
4, 15, attach these templates 12, 13 to the mounting plate 4,
It is slidably supported parallel to 6.

Furthermore, on the other side of each of the templates 12 and 13,
A mounting frame 1 is fixedly installed on each of the mounting plates 4 and 6 on the fixed side and the movable side and faces each other at the dividing surface of the mold.
6 and 17, and the template plates 12 and 13 are slidably supported in the same manner as described above by engaging portions 18 and 19 provided on the surfaces adjacent to the template plates 12 and 13, respectively.

In the transverse direction of the cavity portion 11, both mold plates 1
The shape of the template seen from the sliding side of Nos. 2 and 13 is as follows.
As shown in the figure, each template has a pentagonal house shape arranged in opposite directions, and both templates 12, 1
3 forms a piece of each roof and is inclined with respect to the mounting plates 4, 6 at an angle of inclination corresponding to the difference in slope with the reference plane. They are in contact with each other at the contact surface 20. The mold surfaces 21 and 22 of the respective mold plates 12 and 13 provided on this contact surface 20 are opposed to each other, and have a reference surface having a slope different from that of the cavity portion 11, and communicate with one side thereof. It forms another cavity part 23 in which there is a wall. The side walls 24, 25 forming the other side of the house-shaped roof of each template 12, 13 are formed parallel to this reference plane, and the side walls 26, 27, 2 located on both sides of the house-shaped
8 and 29 are formed perpendicularly to the mounting plates 4 and 6. The remaining side walls 30 and 31 of both mold plates 12 and 13 (located above and below in the figure) are attached to the mounting plates 4 and 13, respectively.
6 and is formed parallel to the side wall 30 of the template 12.
is in slidable contact with the mounting plate 4.

On the sides of both mold plates 12 and 13 on the side where the above-mentioned inclined contact surface 20 separates from the fixed side mounting plate 4, on the fixed side and the movable side, there are mountings facing each other at the mold dividing plane. Frames 32 and 33 are attached and fixed to respective mounting plates 4 and 6. The mounting frame 32 on the fixed side is mounted through a gap 34 having a width corresponding to at least the sliding distance of the mold plate 12 when the mold is opened.
It faces the side wall 26 of the template 12. In addition, the mounting frame 33 on the movable side is inclined in contact with the side wall 24 of the template 12 on the fixed side via the line of contact 35 with the contact surface 20 of both templates 12 and 13, and when the template 12 is opened, the mounting frame 33 is inclined. Forming a locking wall 36 that suppresses sliding and locks the
On the movable side, a side wall 37 perpendicular to the mounting plate 6 contacts the side wall 28 of the mold plate 13, and a sliding means 38 consisting of a spring, a hydraulic cylinder, etc. is interposed therebetween for sliding the mold plate 13.

On the other hand, on the sides of both mold plates 12 and 13 on the side where the contact surface 20 approaches the fixed side mounting plate 4, a blocking core 40 whose base part is fixed to the movable side protruding plate 39 is connected to the fixed side mounting plate 4. and a mounting frame 41 facing each other at the dividing surface of the mold on each of the movable sides,
42 are attached and fixed to the respective mounting plates 4 and 6. The tip of the blocking core 40 extends long toward the fixed side and comes into contact with the template 12 and the mounting frame 41, and on both sides of the template 13, it is slidably in contact with the side walls 25 and is inclined, so that the protruding plate 39 after the mold is opened is A locking wall 43 that suppresses and locks the template 13 during forward movement, and a side wall 44 perpendicular to the protrusion plate 39 connected thereto are formed, and the mounting frames 41, 4 are formed.
On the second side, it is slidably in contact with these. Projecting plate 3
9, a vertical side wall 45 is formed.

The side wall 44 faces the side wall 29 of the template 13 through a gap 46 having a width corresponding to at least the sliding distance of the template 13 when the mold is opened. Note that the template 1 in the gaps 34 and 46
For the sliding widths 2 and 13, the moving distance of each mold plate until the product finishes coming out when opening the mold is l ₁ and l ₂ , and the inclination angle (or the difference between the slopes of both reference planes) is α. Then, they are determined by l ₁ tanα and l ₂ tanα, respectively. The base of the mounting frame 41 on the fixed side projects laterally and comes into contact with the side wall 27 of the template 12, and the template 12
A sliding means 47 similar to that described above is provided for sliding.

A gap 48 is provided between the mold plates 8 and 13 on the movable side and the protrusion plate 39, which corresponds to the sliding distance of the template plates 8 and 13 and the moving distance of the protrusion plate 39 when the mold is opened. A predetermined number of protruding pins 49 and 50 that reach the respective cavity portions 11 and 23 with different slopes are inserted into the movable template plates 8 and 13 at appropriate locations in the protruding plate 39 in a direction parallel to the respective reference planes. It is provided. Also, 51 in the figure
is a return pin fixed to the protrusion plate 39, and 52 is a sprue.

Next, the operation of the above configuration will be explained.

When molten resin is injected into the cavity portions 11, 23 through the sprue 52, an integral molded article 53 having reference surfaces with different slopes is formed. After the solidification time of the molten resin has elapsed, the mold is opened in the order shown in FIG. That is, as the mounting plate 6 on the movable side retreats, the mold plates 8 and 13 on the movable side separate from the mold plates 5 and 12 on the fixed side while keeping the molded product 53 placed on the respective mold surfaces 9 and 22. .
The mold surface 21 of the mold plate 12 on the fixed side has an inclination angle corresponding to the difference in slope of the reference surface with respect to the mounting plate 6, and an undercut portion is formed on the side wall of the mold surface 21. Simultaneously with the mold, both sides of the mold plate 12 are moved between the mold plate 5 and the mounting frame 16 under the action of the sliding means 47.
It is pushed toward the mounting frame 32 while being supported by the engaging parts 14 and 18 of the rod, and moves while being stopped by the locking wall 36 parallel to the reference plane provided on the movable mounting frame 33. Therefore, the molded product 53 is placed on the mold surface 1.
0 and is easily removed from the mold surface 21.

When the mold opening is completed and the protrusion plate 39 is moved forward, the blocking core 40 is also moved forward together with the protrusion pins 49 and 50, so that the template plate 13 is affected by the sliding means 38, and both sides thereof are moved forward. 8
While being supported by the engaging portions 15 and 19 between the blocking core 40 and the mounting frame 17, it begins to slide parallel to the mounting plate 6 toward the side wall 44 of the blocking core 40. In this case as well, the template 13 slides while being locked on the locking wall 43 parallel to the reference plane of the blocking core 40, so that along with the action of the ejecting pins 49 and 50,
The molded product 53 is separated from the mold surfaces 9 and 22 in the same manner as described above.

(Example 2) FIG. 6 shows another example for manufacturing an article having the shape shown in FIG. This is a mode in which only the following points have been changed. Therefore, a description of the common parts will be omitted and only the differences will be described.

The side shape of the stationary side template 60 in this example has a slightly deformed house shape compared to the previous example, but it is in contact with the movable side template 61, which has a pentagonal house shape, and has the same inclination angle as the previous example. They are arranged in directions perpendicular to each other on the surface 62. The respective mold surfaces 63 and 64 of both mold plates 60 and 61 are opposite to each other as in the previous example, so that similar cavity portions 65 are formed.
is formed. In addition, each template 60, 6
Similar to the previous example, the side walls 66 and 67 that form the other sides of the house-shaped roof of 1 are formed to be inclined parallel to the second reference plane, but in this example, both side walls 66 and 6
7 are arranged on the same extended plane. The template 60 protrudes laterally on the side wall 66 side, and the mounting plate 4
Side walls 68 and 69 are formed parallel to each other, and the side wall 68 (located on the upper side in the figure) is slidably in contact with the mounting plate 4. Further, both sides of the template 60 in the sliding direction are defined by side walls 70 and 71 perpendicular to the mounting plate 4.
On the other hand, the templates 61 are located on both sides of the house shape, and the mounting plates 6
There are parallel side walls 72, 73, which are located at the bottom of the house shape and are separated by a perpendicular side wall 74.

On the sides of both mold plates 60 and 61 where the inclined contact surface 62 separates from the fixing side mounting plate 4, the mold is connected via right-angled trapezoidal blocking cores 75 whose bases protrude and are fixed to the plate 39. There are mounting frames 76 and 77 that face each other at the dividing plane, and are fixed to the fixed and movable mounting plates 4 and 6, respectively. One side of the blocking core 75 is inclined in contact with the side wall 67 of the mold plate 61 to form a locking wall 78 that suppresses and locks the mold plate 61 from sliding when the mold is opened, and the other side is connected to the mounting plate 6
A vertical side wall 79 is formed and is slidably in contact with the mounting frame 77. This mounting frame 77 is attached to both templates 6
Via the contact line 80 with the contact surface 62 of 0,61,
On the movable side, the blocking core 7 is connected to the side wall 81.
A locking wall 82 that operates similarly to the previous example and is in contact with the side wall 79 of the mold plate 60 on the fixed side and inclined in contact with the side wall 66 of the template 60 on the fixed side, and a side wall 8 that is parallel to the mounting plate 6 and connected thereto.
3. This side wall 83 is in contact with the side wall 69 of the template 60 on the locking wall 82 side, and the base is fixed to the mounting frame 77 between them, and the tip is inserted into the template 60.
An angular pin 84 inclined in a direction parallel to the reference plane of the cavity portion 65 is attached. A gap 85 having a width at least larger than the sliding distance of the template 60 is provided between the fixed side mounting frame 76 and the side wall 70 of the template 60.

On the opposite side, on the side of both mold plates 60 and 61 on which the inclined contact surface 62 approaches the fixed side mounting plate 4, there are mounting frames 86 and 87, which face each other at the dividing surface of the mold. It is fixedly mounted on the mounting plates 4 and 6. A gap 88 having the same width as the gap 85 is provided between these and the side wall 74 of the movable template 61.

On the other hand, there is a gap 89 between the protruding plate 39 and the side wall 73 of the template plate 61, which corresponds to the sliding movement of the template plate 61 and the moving distance of the protruding plate 39 when the mold is opened. An angular pin 90 that is fitted into the plate 61 and a protruding pin 91 that penetrates the mold plate 61 and reaches the mold surface 64,
Both protruding plates 3 are inclined in a direction parallel to the reference plane.
It is installed on 9.

In this configuration, when the mold is opened, the template 60 receives the action of the angular pin 84 and is locked by the angular pin 84 that is inclined in a direction parallel to the reference plane and the locking wall 82 of the mounting frame 77 on the movable side. is moved toward the fixed side mounting frame 76, so that the molded product can be smoothly removed from the mold surface 63 as in the previous example. Further, the detachment of the protruding plate 39 from the mold surface 64 after opening the mold is also affected by the action of the angular pin 90, and is retained by the angular pin 90 and the locking wall 78 of the blocking core 75, which are inclined in the same direction as the reference surface. This is accomplished by the sliding movement of the holder towards the mounting frame 87.

Each of the above embodiments has been explained by taking as an example the molding of an article having the shape shown in FIG. A concave groove on the base axis of a rectangular parallelepiped, etc.
The present invention can be similarly applied to a shape in which portions having small holes, convex portions, etc. are arranged in series at mutually different slopes. Furthermore, although the grooves and the like provided on the base shaft are shown perpendicular to the base shaft surface in the drawings, there is no problem even if they are inclined. In other words, in this case, for example, if a small hole is drilled diagonally in the base axis of a rectangular parallelepiped, this can be achieved by using mold surfaces with the small hole as the reference plane and the base axis facing each other in the diagonal direction. can. Furthermore, the number of parts connected at different slopes, that is, the number of parts provided with reference surfaces is not limited to two as in the above embodiment. Repeated and installed in a row, 3 of A, B, and C
such as those that have a reference surface of B (in this case, the reference surface of B is arranged perpendicular to the mounting plate), etc.
Any shape in which every other part including a reference plane perpendicular to the mounting plate is connected can be applied. In addition, these articles can be similarly applied to articles in which the intermediate portion is not twisted like the one shown in FIG. 1, and small holes or the like of different slopes are bored in series on the same base axis. Furthermore, although the example shows that the direction of the slope of each reference plane is parallel when viewed from above, slight changes can be made within a range that does not interfere with the design by changing the sliding direction of the template. It is possible.

(Effects of the Invention) As described above, in the present invention, base shafts provided with grooves and the like are successively arranged at different slopes. Since irregularly shaped products with undercuts can be integrally molded, manual work such as conventional gluing and screwing work is no longer required, and the production cost of the above products can be reduced compared to conventional methods. Not only can the width be reduced, but also its strength can be increased.

[Brief explanation of the drawing]

All drawings relate to embodiments of the present invention and are
The figures show an example of a molded product molded according to the present invention, in which a is a perspective view thereof, b is an explanatory side view, and second
The figure is a vertical cross-sectional view showing the main parts of the mold for molding the molded product shown in Figure 1, and Figures 3 and 4 are vertical cross-sections taken along the - arrow line and - arrow line, respectively, in Figure 2. 5A and 5B are explanatory views of the operation of the above embodiment, in which a shows the state immediately after the mold is opened, b shows the state after the mold has finished opening, and c shows the state when the product ejection is completed. FIG. 6 is a longitudinal sectional view showing a different aspect from FIG. 4 of the embodiment. Explanation of main symbols in the drawings, 4... Fixed side mounting plate, 5, 12, 60... Fixed side template, 6... Movable side mounting plate, 8, 13, 61... Movable side mold Plate, 9, 10, 21, 22, 63, 64... Mold surface, 11, 23, 65... Cavity part, 2
4, 25, 66, 67... side wall, 39... projecting plate, 49, 50, 91... projecting pin.

Claims (1)

[Claims for Utility Model Registration] 1. A molding die having a cavity having a shape in which parts each having a plurality of reference surfaces having different slopes are connected in series, the first fixed side and the movable side being connected in series. Both mold plates are fixed to their respective mounting plates with their respective mold surfaces facing each other, and the mold surfaces form a cavity portion having a first reference plane perpendicular to the mounting plate, and Adjacent to each of the two mold plates, both the second fixed side and movable side mold plates are placed with their respective mold surfaces facing each other,
A cavity part is provided to be slidable across the cavity part and in mutually opposite directions, and a cavity part having a second reference surface is formed in communication with the first cavity part by the two mold surfaces, and One side of each of the mold plates is formed parallel to the second reference plane, and a means for locking the movement of the second mold plates on both side walls is provided on each of the mounting plate and the protrusion plate on the movable side. fixedly attached to the
A molding die comprising a protruding pin fixedly attached to the protruding plate, the protruding pin extending through each of the mold plates on the movable side to reach the mold surface and parallel to the reference plane of each cavity portion. 2. Fixedly install a template mounting frame on the fixed side mounting plate,
A sliding means for this template is installed between this mounting frame and the second stationary template, and a means for locking the movement of the second stationary template and the second The molding die according to claim 1, which is a registered utility model, characterized in that a sliding means for the template is installed between the movable template and the template. 3 A first angular pin that slides this template at its tip is attached to the means for locking the movement of the second stationary template, and the second movable template is attached to the protrusion plate at its tip. The second sliding
The molding die according to claim 1, which is characterized in that it is equipped with an angular pin.