JPH058259A - Nozzle-positioning device of injection molding machine - Google Patents

Abstract

PURPOSE:To remove the sag or the abrasion of touched part, while the touch of a ssprue bush to a rozzle is carried out exactly. CONSTITUTION:While step part is formed on the sprue bush 17 of a mold, the spherically worked part which has the some curvature as that of the nozzle tip of an injection molding machine, is formed at the step part 17, of the sprue bush. The positioning member 18 in which the nozzle-inserting part for inserting the nozzle of the injection molding machine is provided, is fitted to the step part 171 of the sprue bush, and when the nozzle 13 of the injection molding machine is inserted into nozzle-inserting part 181, the axis-center of the nozzle of the injection molding machine is caused to coincide with that of the spherically worked part 172 of the sprue bush.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle positioning device for an injection molding machine for positioning the nozzle of the injection molding machine.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a nozzle positioning device of an injection molding machine is used to position the tips of a mold 1 and an injection nozzle 2 on a movable base 3 in a horizontal adjusting bolt 4 and a vertical direction. The rough position is determined by the adjusting bolt 5 in the direction, and the final positioning is performed by moving the movable table 3 forward and bringing the sprue bush 6 of the mold 1 into contact with the tip of the injection nozzle 2. That is, as shown in FIG. 6, the sprue bush 6 is subjected to spherical processing in the same manner as the tip of the injection nozzle 2, and when the sprue bushes 6 come into contact with each other, the positioning is performed by using the movements of the mutual axial centers. .

[0003]

However, in the above-mentioned conventional example, the spherical shape of the contact portion between the sprue bush 6 and the injection nozzle 2 is sagged by repeated touch on / off of the nozzle, thereby causing the sprue to reach the rear end of the sprue. As shown in FIG. 7, undercut 7 occurred, and the sprue could not be removed. Further, as a result of repeated nozzle touches, galling 8 is generated as shown in FIG. 8, the contact surface is abraded, and metal powder gets into the molded product.

The present invention has been made in view of the above problems, and an object thereof is to enable the sprue bush and the nozzle to be touched extremely accurately, and to prevent the above-mentioned sag and wear of the touch portion. is there.

[0005]

In order to achieve the above object, according to the present invention, a nozzle in which a contact processing portion for contacting a tip of an injection nozzle is formed on a sprue bush of a mold and the injection nozzle is inserted. A positioning member provided with an insertion portion is attached to the sprue bush, and when the injection nozzle is inserted into the nozzle insertion portion of the positioning member attached to the sprue bush, contact processing between the center of the injection nozzle shaft and the sprue bush The centers of the sections are made to coincide with each other.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a nozzle positioning device of an injection molding machine. In FIG. 1, 11 is a base, and this base 1
A mold 12 and an injection nozzle 13 of an injection molding machine are provided on the mold 1. This injection nozzle 13 is an adjustment bolt 1
It is mounted on a movable table 16 which can be adjusted horizontally and vertically by 4 and 15 and can be moved forward and backward.

2 and 3 specifically show the receiving portion of the injection nozzle 13 of the injection molding machine in the die 12 of FIG. 1, and 17 is a sprue bush of the die 12,
Reference numeral 18 is a positioning member, and 13a is a tip portion of the injection nozzle 13. The sprue bush 17 has a positioning member 18
Spherically portion 17 ₂ of the same curvature as the nozzle tip 13a to the stepped portion 17 ₁ and the step portion 17 ₁ are formed for fitting the.

The positioning member 18 is a nozzle insertion portion 18
A cylindrical portion 18 ₂ having ₁ and a brim portion 18 ₃ around the cylindrical portion 18 ₂ are provided, and the positioning member 18 is formed with a fitting portion 18 ₄ into the step portion 17 ₁ . .
A ball bearing 19 is provided in the nozzle insertion portion 18 _{1 so} that the injection nozzle 13 can be easily inserted.
The positioning member 18 fits the fitting portion 18 ₄ into the step portion 11 ₁ of the sprue bush 17 and the brim portion 18 ₃ into the bolt 2
It is attached to the mold 12 at 0, and the sprue 17 ₃ provided at the center of the sprue bush 17 and the center of the axis of the positioning member 18 are aligned.

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

[0011] As the positioning of the distal end portion 13 _a of the injection nozzle 13 of the mold 12 and the injection molding machine fit the injection nozzle 13 to the nozzle insert 18 ₁ of the positioning member 18, the horizontal direction of the adjusting bolt 14 and the vertical Positioning is performed by adjusting the adjusting bolt 15 in the direction, the movable table 16 is moved forward, and the injection nozzle 13 is inserted into the nozzle insertion portion 18 ₁ of the positioning member 18. When the injection nozzle 13 is inserted into the nozzle insertion portion 18 ₁ , the center of the ejection port of the injection nozzle 13 and the center of the sprue 17 ₃ of the spherical surface processing portion 17 ₂ of the sprue bush 17 coincide with each other.

In the above embodiment, the ball bearing 19 is provided in the nozzle insertion portion 18 _1. However, the present invention is not limited to this, and can be implemented without providing a ball bearing as shown in FIG. At the time of nozzle insertion 18 ₁
Since the injection nozzle 13 may rub against each other at the moment of insertion, it is preferable to provide a tapered portion 18 ₅ around the opening of the nozzle insertion portion 18 ₁ . In this example, since the ball bearing is not provided, there is a risk that galling will occur between the nozzle insertion part, but considering that the resin easily adheres to the nozzle insertion part, the ball bearing movement It is thought that it is better not to have a ball bearing because it will deteriorate.

[0013] FIG. 5 is an example in which the taper portion 21a on its opening peripheral via the member 21 to the nozzle insert 18 ₁ is provided with the ball bearing 19 to the nozzle insert 18 _1, in this case, the structure is Although it becomes slightly complicated, in this example, it is possible to prevent the resin from adhering to the nozzle insertion portion and impair the movement of the ball bearing, and it is also possible to prevent galling at the nozzle insertion portion.

[0014]

As described in detail above, according to the present invention, the contact processing portion for contacting the tip of the injection nozzle is formed on the sprue bush of the mold, and the position where the nozzle insertion portion for inserting the injection nozzle is provided. When the injection member is attached to the sprue bush and the injection nozzle is inserted into the nozzle insertion portion of the positioning member attached to the sprue bush, the center of the shaft of the injection nozzle and the center of the contact processed portion of the sprue bush coincide with each other. As a result, it is possible to prevent galling at the sprue bush and the tip of the nozzle, to prevent metal powder from entering the molded product, and to prevent undercut 7 from the sagging of the touch portion of the sprue bush. Since the trouble of not coming off is solved and the sprue bush and the nozzle tip hole are not displaced, the occurrence of resin leakage can be prevented.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a nozzle positioning device of an injection molding machine showing an embodiment of the present invention.

2 is a detailed view of a receiving portion of an injection nozzle of the injection molding machine in the mold of FIG.

FIG. 3 is a diagram when the injection nozzle of FIG. 2 is inserted into a nozzle insertion portion of a positioning member.

FIG. 4 is a diagram when a taper portion is provided in an opening of a nozzle insertion portion without providing a ball bearing from the positioning member shown in FIG.

5 is a diagram when a taper portion is provided in the opening of the nozzle insertion portion of the positioning member shown in FIG.

FIG. 6 is a configuration diagram of an injection nozzle positioning device of a conventional injection molding machine.

7 is a view of a receiving portion of an injection nozzle of the injection molding machine in the mold of FIG.

FIG. 8 is a diagram when scoring occurs in the mold of FIG.

[Explanation of symbols]

11 Base 12 Mold 13 Injection Nozzle 14 Horizontal Adjusting Bolt 15 Vertical Adjusting Bolt 16 Movable Stand 17 Sprue Bush 17 ₁ Step 17 ₂ Spherical Machining 17 ₃ Sprue 18 Positioning Member 18 ₁ Nozzle Insert 18 ₂ Cylindrical 18 ₃ Flange 18 ₄ Fitting 19 Ball Bearing 20 Bolt

Claims (5)

[Claims] 1. A sprue bush is attached to the sprue bush with a positioning member provided with a nozzle insert portion into which a tip of an injection nozzle is brought into contact with a sprue bush of a mold. Nozzle positioning device for an injection molding machine, characterized in that, when the injection nozzle is inserted into the nozzle insertion portion of the positioning member attached to the nozzle, the center of the axis of the injection nozzle and the center of the contact processing portion of the sprue bush coincide with each other. . 2. The nozzle positioning device for an injection molding machine according to claim 1, wherein the sprue bush of the mold has a step portion, and a positioning member is fitted in and attached to the step portion. 3. The contact processing portion of the mold sprue bush is formed as a spherical processing portion, and the spherical surface of the spherical processing portion is formed to have the same curvature as the tip of the injection nozzle. Nozzle positioning device for the injection molding machine described. 4. The nozzle positioning device of an injection molding machine according to claim 1, wherein a ball bearing is provided at a nozzle insertion portion of the positioning member to facilitate insertion of the injection nozzle. 5. The nozzle positioning of the injection molding machine according to claim 1, wherein the opening of the nozzle insertion portion of the positioning member is formed in a tapered shape to facilitate insertion of the injection nozzle. apparatus.