JP3267134B2 - Resin mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molding die, and more particularly to a resin molding die with improved gate cut.

[0002]

2. Description of the Related Art FIG. 16 is a cross-sectional view of a conventional resin molding die, in which a molten resin flow path 3 is formed via a gate 2 obliquely communicating with a resin molding chamber 1. Since the gate 2 is obliquely communicated with the resin forming chamber 1, as shown in FIG. 17, the communicating portion has a direction on the acute angle side and a direction on the obtuse angle side. put it here,
As shown in FIG. 18, if the resin molded product 6 solidified in the resin molding chamber 1 moves to the acute angle side with respect to the runner 5 solidified in the molten resin flow path 3, the acute angled edge portion It can be cut like a knife and clean. However, as shown in FIG. 19, depending on the condition of the mold opening surface, the resin molded product 6 may have to be moved to the obtuse angle side with respect to the gate 2, and in this case, FIG.
As shown in FIG. 9, the runner 5 is torn off.

[0003]

In the above-mentioned conventional resin molding die, there is a problem that when the resin molded product has to be moved to the obtuse angle side of the gate to cut the gate, the cut surface becomes inconsistent. Was. The present invention has been made in view of the above problems, and has as its object to provide a resin molding die capable of cleaning a cut surface of a gate.

[0004]

Means for Solving the Problems To achieve the above object, the invention according to claim 1 comprises a pair of molds which approach and separate from each other and open the mold, and the mold opening surfaces of both molds are provided. In a resin molding die having a gate formed with a molten resin flow path, and a gate that obliquely communicates from the molten resin flow path to the side of the resin molding chamber in the mold while facing inward, the molten resin flow path is opened when the mold is opened. An extruding mechanism for lifting the runner formed therein, the extruding mechanism comprising :
Slide pin that intersects the molten resin flow path on the mold opening surface
And the above-mentioned molten tree when sliding
That it is composed of an inclined wall that crosses the fat flow path
Has features .

[0005]

Further, the invention according to claim 2 provides
In the resin molding die according to 1, while forming a plurality of resin molded products that are engaged and assembled with each other in the die, a space is formed by moving the die between the resin molded products,
In assembling the one resin molded product by moving the other resin molded product relatively while holding the one resin molded product and engaging the other resin molded product with the one resin molded product, the extruding mechanism is applied to the resin molded product to be moved in the same manner. The structure is such that a continuous runner is raised to cut a gate.

[0007]

According to the first aspect of the present invention, as described above, the gate is inclined obliquely from the molten resin flow path formed on the opening surface of the mold to the side of the resin molding chamber in the mold. Are in communication. Therefore, the side directed from the gate to the molten resin flow passage ing an acute angle side. And extruder
The slide pins that make contact with the molten resin flow path on the mold opening surface
The slide pin.
When this is done, the inclined wall crosses the molten resin flow path. Follow
The runner remaining in close contact with the mold opening surface when the mold is opened
When lifted up by the wall, the runner at the gate is on the acute angle
And pressed against sharp edges
Cut and cut.

[0008]

Further, in the invention according to claim 2 configured as described above, a plurality of resin molded products are molded in one mold, and a plurality of resin molded products are engaged with each other. The mold is moved to form a space, and the other resin molded product is relatively moved while holding one resin molded product, so that the other resin molded product is engaged with the one resin molded product, and assembly is performed. Do. Here, normally, when the mold is opened and the resin molded product is extruded, it can be cut by pressing the runner against the edge on the acute angle side, but the resin molded product is moved in another direction without being extruded from the mold. Therefore, it may be necessary to move the gate portion in a direction different from the edge direction. In such a case, the extruding mechanism raises the runner continuous to the resin molded product via the gate and presses the runner against the acute angle portion to cut it.

[0010]

As described above, according to the first aspect of the present invention, a runner that solidifies in a molten resin flow path communicating with a resin molding chamber via a gate is provided on the acute angle side of the gate. It is possible to provide a resin molding die capable of cleaning the cut surface because it is lifted by pressing against the edge of the resin molding. Moreover, the runner is moved by moving the slide pin.
, So that the desired time
Can be cut with a ring.

[0011] it is et al., According to the invention according to claim 2,
In molding and engaging and assembling a plurality of resin molded products that are engaged and assembled with each other in one mold, there is a situation in which it is impossible to press the gate against the acute angle side of the gate when moving the resin molded products. When this occurs, the runner can be extruded and cut at the sharp corners of the gate and cut.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a state of the resin molding die according to one embodiment of the present invention during clamping as viewed from above, and FIG. 2 shows a state of the mold opening surface as viewed from the front. 3 is a perspective view showing the mold opening surface immediately after the mold opening. In this figure, this resin molding die 10 is a fixed die 2
0 and a movable mold 30. The movable mold 30 includes three resin molding chambers 31 to 33 in a central portion, and two sets of slides are formed so as to surround these resin molding chambers 31 to 33. Pins 34a and 34b and slide pin 3
5a and 35b are provided. In FIG. 2, slide pins 34a and 34b are supported so as to be slidable in the horizontal direction, and slide pins 35a and 35b are supported so as to be slidable in the vertical direction and are driven by angular pins (not shown). ing. And
Slide pins 34a, 34b and slide pin 35
a and 35b move as shown in FIGS. 3 to 5 to engage and assemble the resin molded article 100.

The resin molded article 100 has a housing section 110 formed by a central resin molding chamber 32 and retainer sections 120 formed by resin molding chambers 31 and 33 on both sides.
FIG. 3 shows a state in which the core pins 22 formed on the side of the fixed mold 20 are drawn out of the resin molding chambers 31 to 33. Initially, the housing part 110 and the retainer part 1
Although the space between 20, 20 is closed, as shown in FIG. 4, when the slide pins 34a, 34b first slide outward and open, a space is formed between the two. Next, FIG.
When the slide pins 35a and 35b are slid inward as shown in FIG.
The retainer portions 120 and 120 are pressed from both sides of the housing portion 110 and engaged to assemble them.

A semicylindrical groove is formed on the side of the fixed die 20 facing the mold opening surface, and the molten resin flow path 21 is formed in the groove.
Is formed. The molten resin flow path 21 is provided in the resin molding chamber 3.
The groove itself terminates when it extends to the vicinity of the respective resin molding chambers 31, 33. Further, at the end portion, gates 36 and 38 communicating with the resin molding chambers 31 and 33 are formed on the movable mold 30 side. The resin molding chamber 32 is filled with the resin through another route.

The inner diameters of the gates 36, 38 become smaller toward the inner side, and gradually approach the side walls of the resin molding chambers 31, 33, and are obliquely communicated with the resin molding chambers 31, 33. That is, since the diagonally extending portion extends obliquely from the mold opening surface toward the back side and communicates with the side walls of the resin forming chambers 31 and 33, the opening of the communicating portion has the acute-angled edge on the side of the molten resin flow path 21 and the back side. The edge is on the obtuse angle side. In the present embodiment, the molten resin flow path 2 is
Although the groove 1 is formed, it may be formed on the mold opening surface, and may be formed on the movable mold 30 side. The mold opening surface is not necessarily limited to the fixed mold 20 and the movable mold 3.
The surface is not limited to the mold opening surface of 0, and may be a surface that is opened by moving a slide pin. Further, in the case where the intermediate mold is provided in a sandwich shape, two mold opening surfaces are generated, but such a mold may be used. In addition, although the molten resin flow path 21 is formed in a semi-cylindrical shape, any shape may be used as long as it can be cut out by opening the mold.

Of course, the resin molded product to be molded is not limited to the one in which the housing portion 110 and the retainer portion 120 are engaged and assembled, but may be any resin molded product. However, the retainer sections 120, 1
20 moves in a direction perpendicular to the mold opening direction because it moves in parallel with the mold opening surface.
8 is substantially parallel to the mold opening direction, so that it does not necessarily become parallel to the direction in which the retainers 120 and 120 move. Therefore, in this state, the retainers 120, 120
Is moved, the runner cannot be pressed against the acute angles of the gates 36 and 38. That is, in the case where the resin molded product is moved in the mold in this manner, there is a tendency that the cut surface is not originally clean at the time of gate cutting.

As shown in FIG. 6, a slide pin 34a provided on the mold opening surface of the movable mold 30 intersects with the molten resin flow path 21, and a projection having an inclined surface on the mold opening surface. 34a1 and 34a1 are formed. Projection 34
a1, 34a1 are formed at positions that cross the molten resin flow path 21 in the range in which the slide pin 34a slides, and the inclined surfaces 34a1a that gradually project from the side facing the molten resin flow path 21 toward the opposite side. , 34a
1a. As shown in FIGS. 7 to 12, the protrusions 34 a 1 and 34 a 1
When “a” slides, it moves toward the side of the molten resin flow path 21 and traverses, and acts so as to float the runner 40 remaining solidified in the molten resin flow path 21. Therefore, in this sense, the slide pin 34a and the projection 34a1 constitute a pushing mechanism.

Next, a reference example will be described. 13 to 15, a through hole 51 penetrating the mold opening surface is formed, and a cylindrical extrusion cylinder 5 is formed in the through hole 51.
2 is wearing. Here, the through hole 51 has an opening diameter on the mold opening surface side smaller than the opening shape on the back surface side, and the extrusion cylinder 52 has a flange 52a formed on the rear end side.
The extruding cylinder 52 is cut out from the rear side and a spring 53 is inserted therein, and the spring 53 urges the extruding cylinder 52 to protrude from the through hole 51 toward the mold opening surface.

The tip end surface of the extrusion cylinder 52 constitutes a part of the mold opening surface and intersects with the molten resin flow path 21 and is larger than the intersection surface. Therefore, while the mold is being clamped, it is brought into contact with the mold opening surface of the fixed mold 20 other than the molten resin flow path 21 and is pushed into the through hole 51. come. Then, the runner 40 remaining on the mold opening surface and solidified is raised. Of course, other than these, various configurations that allow the runner 40 to float using an elastic member, a cam, a hydraulic pressure, or the like are possible.

Next, the operation of this embodiment having the above configuration will be described. In the embodiment shown in FIGS. 1 to 12, the molten resin is injected from an injection cylinder (not shown) during mold clamping, and the molten resin is injected into the resin molding chambers 31 and 33 via the molten resin flow path 21 and the gates 36 and 38. And filling. When the mold is opened after solidification, the runner 40 remains on the mold opening surface as shown in FIG. Then, when an angular pin (not shown) opens the slide pins 34a and 34b in the process of opening the mold, as shown in FIGS. 7 and 8, the projection 34a1 located away from the runner 40 moves as shown in FIG. As shown in FIG. 9 and FIG. 10, the protrusion enters the lower side of the runner 40 and floats, and finally the projection 34a1 completely passes under the runner 40.

The tip of the runner 40 is connected to the resin molding chambers 31 and 33 through the gates 36 and 38, however, to lift the runner 40 forces it out. However, the gates 36 and 38 have so-called acute angles on the mold opening side, so that the runner 40 acts to press against the acute-angled edge portions, so that the cut surfaces can be made clean. When the slide pins 34a and 34b are opened in this manner, the runner 40 connected to the retainers 120 and 120 is extruded and cut cleanly. The pushing direction of the runner 40 is determined by the slide pins 35a and 35
The gates 36 and 38 which are orthogonal to the moving direction of b and could not be cut cleanly because they were not originally pushed to the acute angle side
However, it can be cut neatly. Thereafter, the slide pins 35a, 35b are moved inward, and the retainers 120, 120 are pressed against the housing 110 to be engaged and assembled.

On the other hand, in the case of the reference example shown in FIGS. 13 to 15, as the fixed mold 20 and the movable mold 30 are opened, the extrusion cylinder 52 protrudes, and the runner 40 is raised. Therefore, the gates 36 and 38 are also pulled up in the same direction, so that the cut surface becomes clean. As described above, the fixed mold 20 and the movable mold 30 that approach and separate from each other and open the mold clamping mold are provided.
The resin molding die 10 is formed as a molten resin flow path 21 by forming a semi-cylindrical groove on the mold opening surface on the side of the fixed mold 20, and the tip of the molten resin flow path 21 is movable on the opposite side. The gate 3 extending obliquely toward the back side on the side of the mold 30
The slide pins 34a communicate with the side surfaces of the resin molding chambers 31 and 33 via the first and second resin molding chambers 38 and 38 and constitute a pushing mechanism.
Slides when the mold is opened, the slide pin 34a
The protrusions 34a1 formed so as to traverse the molten resin flow path 21 above are solidified on the mold opening surface and the remaining runner 40
And the tip of the runner 40 is connected to the gates 36 and 38.
Inside, it is pressed against the edge on the acute angle side and cut neatly.

[Brief description of the drawings]

FIG. 1 is a top view showing a state during clamping of a resin molding die according to one embodiment of the present invention.

FIG. 2 is a front view of a mold opening surface of a movable mold in a resin molding die.

FIG. 3 is a schematic perspective view showing a movable mold immediately after the mold is opened.

FIG. 4 is a schematic perspective view showing a state in which a mold has been moved to form a space between resin molded products.

FIG. 5 is a schematic perspective view showing a state where the resin molded products to be engaged and assembled with each other are pressed and engaged and assembled;

FIG. 6 is a perspective view of a mold opening surface of the resin molding die immediately after the movable mold is opened.

FIG. 7 is a diagram showing a positional relationship between a slide pin and a runner immediately after the mold is opened.

FIG. 8 is a diagram showing the positional relationship between the slide pin and the runner immediately after opening the mold as viewed from another viewpoint.

FIG. 9 is a diagram showing a positional relationship when a protrusion starts floating the runner after the mold is opened.

FIG. 10 is a diagram showing the positional relationship when the protrusion starts floating the runner after opening the mold, as viewed from another viewpoint.

FIG. 11 is a diagram showing a positional relationship when a protrusion passes below the runner and completely floats.

FIG. 12 is a diagram showing the positional relationship when the projection passes below the runner and completely floats, as viewed from another viewpoint.

FIG. 13 is a perspective view showing a state in which an extrusion cylinder in a resin molding die according to a reference example does not protrude.

FIG. 14 is a cross-sectional view of an extrusion cylinder portion during mold clamping.

FIG. 15 is a cross-sectional view of an extruded cylinder portion after the mold is opened.

FIG. 16 is a cross-sectional view showing a runner formation state in a conventional resin molding die.

FIG. 17 is a view showing the direction of a gate in a conventional resin molding die.

FIG. 18 is a side view showing a state where a gate is neatly cut in a conventional resin molding die.

FIG. 19 is a side view showing a state in which a gate is not cleanly cut in a conventional resin molding die.

[Explanation of symbols]

10 ... resin molding die 20 ... fixed die 21 ... molten resin flow path 30 ... movable die 31 to 33 ... a resin molding chamber 34a ... slide pin 34a1 ... projection 34A1a ... inclined surfaces 36 to 38 ... gate 40 ... run Na 1 00 ... Resin molded product 110: Housing part 120: Retainer part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 45/00-45/84 B29C 33/76 H01R 43/18

Claims (2)

(57) [Claims] 1. A mold having a pair of molds which approach and separate from each other to open a mold, and a mold resin flow path is formed on a mold opening surface of both molds. in the resin molding mold having a gate communicating with the obliquely moving toward to the side surface of the forming chamber at the back, comprising a pushing mechanism which float a runner formed in the molten resin flow passage at the time of mold opening, the extrusion mechanism With the molten resin flow path on the mold opening surface
The intersecting slide pins and the slide
Due to the inclined wall that crosses the molten resin flow path during riding
A resin molding die characterized by being constituted . 2. The resin molding die according to claim 1, wherein a plurality of resin moldings are engaged with each other in the die.
Products and molds between the resin molded products
Move to form a space and hold one resin molded product
Move other resin molded products relatively to one resin molded product
When assembling by engaging other resin molded products,
The extruding mechanism is connected to the resin
A resin molding die characterized in that the gate is cut off by lifting the female .