JPH08183070A - Gate port of mold device - Google Patents

Abstract

PURPOSE: To easily prevent inclination of a core pin at low cost by a method wherein a gate port member is provided between a runner part for flowing a resin and a cavity part for molding the resin into a molded piece, and the gate port member is movably provided so that an injection angle of the resin against the core pin can be adjusted. CONSTITUTION: Cavity parts 2a, 2b for molding a resin into a molded piece are formed inside a pair of split cavities 1a, 1b. In front of the cavity parts 2a, 2b, cylindrical gate port member 4a, 4b with a gate port part 3a for passing a resin flow are rotatably mounted. The gate port members 4a, 4b are each provided with a flange part at the end thereof to be easily rotated. Runner parts 6a, 6b are formed in the split cavities 1a, 1b correspondingly to the gate port part 3a. A resin flow direction can be changed by moving the gate port members 4a, 4b, whereby an injection angle of a resin against a core pin 9 is adjusted for preventing inclination of the core pin 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate port provided in a mold device for injection molding or the like.

[0002]

2. Description of the Related Art An example will be described with reference to FIGS.
Inside the pair of split mold cavities 101a and 101b, cavity parts 102a and 102b in which molded products are molded are formed.
Are formed. Also, the cavity portion 102
a, front of 102b (hereinafter, the left direction in the figure is referred to as the front)
The gate openings 103a and 103b for pouring the resin into the cavities 102a and 102b, and the runner 104.
a and 104b are formed continuously. In addition, runner plates 105a and 105b are attached in front of the split mold cavities 101a and 101b, and runner portions 106a and 106b communicating with the runner portions 104a and 104b are attached to the runner plates 105a and 105b. Has been formed. Reference numeral 107 is a core pin for forming a cavity inside the molded product, and is provided so as to be inserted into and removed from the cavities 102a and 102b. As can be seen from the figure, this mold device is for molding a cap such as a writing instrument with a clip.

Next, the operation will be described. After attaching the mold device to the molding machine, the pair of split mold cavities 101a and 101b are closed while the core pin 107 is advanced. That is, the mold is closed. Next, when the resin is poured into the runners 106a and 106b, the resin is applied to the runners 104a and 104b and the gate opening 103.
a, 103b and cavity parts 102a, 102b
Flow into. When the flowed resin solidifies, a molded product is completed. Here, the mold is opened and the molded product is discharged from the mold (cavity and core pin).

[0004]

However, in the above-described core pin, since it is supported by only one of the rear portions, it bends due to its own weight, or
It sometimes bent due to the pressure of the inflowing resin. When molding is performed with the core pin bent like this, the molded product may have uneven thickness, or the core pin may come into contact with the cavity and open a hole in the molded product. Due to repeated bending, the core pin was locally deteriorated, which sometimes damaged the core pin.

Further, in recent years, the shape of the inside of the molded product has become complicated, and the outer shape of the core pin has also become complicated accordingly, so that the pressure of the resin that hits each part of the core pin becomes non-uniform, and the above problems occur. Is becoming more frequent. The illustrated example is one example. Here, the position and direction of the gate opening are changed, but reworking the gate opening requires reworking the entire cavity, which requires a large amount of cost. Further, the processing has to be performed with the mold removed from the molding machine, and the attachment and detachment work has been very troublesome.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems by providing a gate port member between a runner portion through which a resin flows and a cavity portion where a molded product is molded. The gate opening member can be moved so that the inflow direction of the resin can be changed and the angle at which the resin contacts the core pin can be adjusted.

[0007]

1 to 4 show a first embodiment of the present invention.
Inside the pair of split mold cavities 1a and 1b are formed cavity portions 2a and 2b in which molded articles are molded. In addition, in front of the cavity portions 2a and 2b (hereinafter, the left direction in the drawing is referred to as the front), the cavity portion 2
Cylindrical gate port members 4a and 4b (see FIG. 3) having gate port portions 3a and 3b for pouring resin into a and 2b are always fixed, but they are mounted so as to be rotatable and fixed as necessary. ing. The cylindrical gate opening member 4
Collars 5a and 5b are formed at the ends of a and 4b,
When rotating, it is easy to rotate. As a method for fixing the gate port members 4a and 4b, suitable means such as pressure contact with a screw member, concave and convex engagement, engagement with a ball plunger, etc. can be adopted.

In the split mold cavities 1a and 1b, runner portions 6 are provided at positions where the gate openings 3a and 3b face each other.
a and 6b are formed. Further, runner plates 7a and 7b are provided in front of the split mold cavities 1a and 1b.
Is attached to the runner plates 7a, 7
Runner portions 8a and 8b which communicate with the runner portions 6a and 6b are formed in b. Reference numeral 9 is a core pin for forming a cavity inside the molded product,
It is provided so as to be inserted into and removed from a and 2b.

[0009]

Function: By moving the gate port member, the inflow direction of the resin can be changed and the angle at which the resin contacts the core pin can be adjusted, so that the core pin does not bend.

Next, the method of use will be described. First, the gate port members 4a and 4b of the mold device are set at arbitrary positions, and the mold device is attached to the molding machine. Here, molding is performed on a trial basis (generally called test pressure). If this test pressure gives good results, continue molding. However, as mentioned above as a problem of the prior art, when uneven thickness or the like occurs in the molded product, the molding is stopped and the mold device is expanded. The mold device is attached to the molding machine. Here, the gate opening members 4a and 4b are released from the fixed state and appropriately rotated (see FIG. 4). Needless to say, it is possible to produce a good molded product. This process is repeated until a good molded product is produced.

FIGS. 5 and 6 show a second embodiment of the present invention.
Instead of the cylindrical gate opening members 4a and 4b of the second embodiment,
The gate openings 3a and 3b may be moved by making the block-shaped gate openings 10a and 10b slide in the split cavity (sliding grooves 11a and 11b). In the previous embodiment, it is possible to rotate and move in the vertical direction in the figure, whereas in this embodiment, it is possible to move in a plane.

7 to 9 show a third embodiment of the present invention. This is an example in which the gate opening member 12 is spherical. The second
The embodiment can be moved two-dimensionally, whereas this embodiment can be moved three-dimensionally. Moreover, since the resin has a spherical shape, the inflow angle of the resin can be set radially, and various adjustments can be made. In addition, 13 is the spherical gate opening member 12
And a runner hole is formed in the center of the holding member. Reference numeral 14 is a screw member for fixing the gate opening member 12 after adjusting it. By the way, the present embodiment is a mold apparatus for molding a molded product such as a test tube for a line or an ink tank for refilling a fountain pen.

[0013]

The present invention has a runner portion through which a resin flows,
A gate port member is arranged between the cavity where the molded product is molded, and the gate port member can be moved so that the resin inflow direction can be changed and the angle of contact with the resin core pin can be adjusted. Therefore, the gate opening can be moved with the mold attached to the molding machine, and therefore, the bending of the core pin can be prevented easily and at low cost.

[Brief description of drawings]

FIG. 1 is a front sectional view of a first embodiment of the present invention.

FIG. 2 is a plane sectional view taken along the line AA of FIG.

3 is an external perspective view of one of the gate opening members of FIG. 1. FIG.

FIG. 4 is an enlarged view of the gate opening portion of FIG.

FIG. 5 is a front sectional view of a second embodiment of the present invention.

6 is an external perspective view of one of the gate opening members of FIG.

FIG. 7 is a front sectional view of a third embodiment of the present invention.

8 is a perspective view showing the appearance of the sphere of FIG. 7. FIG.

9 is a right side view of the gate opening portion of FIG. 7. FIG.

FIG. 10 is a front sectional view of a conventional technique.

11 is a plan sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1a, 1b A pair of split cavities 2a, 2b Cavity parts 3a, 3b Gate opening parts 4a, 4b Gate opening members 5a, 5b Collar parts 6a, 6b Runner parts 7a, 7b Runner plates 8a, 8b Runner parts 9 Core pins 10a , 10b Gate opening member 11a, 11b Sliding groove 12 Gate opening member 13 Holding member 14 Screw member

Claims (1)

[Claims] 1. A gate port member is provided between a runner part through which a resin flows and a cavity part in which a molded product is molded, and the direction of inflow of the resin can be changed to adjust the angle of contact with the resin core pin. As described above, the gate port of the mold device is characterized in that the gate port member can be moved.