JPH10193413A - Injection molding machine - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To increase plasticizing ability without increasing the size of an injection unit. A plasticizing mechanism (5) for heating and melting a molding material (P) and supplying it to a mold device (A), and a fixed-side mold mounting plate (A) of the mold device (A)
a, a molding material storage chamber 1 that stores the molding material P supplied from the plasticizing mechanism 5 and a molding material storage chamber 1 that is at least partially housed in the fixed-side mold mounting plate Aa of the mold apparatus A. Mechanism 4 for injecting the molding material P stored in the mold into the dies Ab and Ad of the mold apparatus A, and the plasticizing mechanism 5 or the molding provided on the fixed-side mold mounting plate A of the mold apparatus A for injection. A check valve 6 for preventing backflow of the material P to the plasticizing mechanism 5 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an injection molding machine for injecting a molding material made of a synthetic resin material or the like which has been melted by heating into a mold of a mold apparatus for molding.

[0002]

2. Description of the Related Art A conventional injection molding machine, for example, shown in FIG. 5 is known.

[0003] This conventional injection molding machine comprises a mold apparatus A for molding a molding material P and an injection apparatus B for injecting the molding material P into the mold apparatus A. In the mold apparatus A, a fixed mold Ab is mounted on a fixed mold mounting plate Aa, and a movable mold mounting plate A
The movable mold Ad is attached to c. Injection device B
It is called a pre-plasticizer type, and is formed by extruding the molding material P by heating, melting, and extruding it from a plasticized portion Ba such as a plunger type or a screw type, and connected to the plasticized portion Ba at a tip end portion. It comprises a fixed mold Ab of the mold apparatus A and an injection section Bb for injecting the molding material P into the movable mold Ad.

According to this conventional injection molding machine, the heating and melting of the molding material P can be continued in the plasticizing section Ba while the molding material P is being injected by the injection section Bb of the injection device B. The advantage of increased plasticizing ability is obtained.

[0005]

In the above-mentioned conventional injection molding machine, the injection device B has a plasticizing portion Ba, which is formed separately.
Since the injection unit Bb is assembled, the injection device B
There is a problem that a part becomes large.

SUMMARY OF THE INVENTION The present invention has been made in consideration of such problems, and has as its object to provide an injection molding machine capable of increasing plasticizing ability without increasing the size of an injection device.

[0007]

In order to solve the above-mentioned problems, an injection molding machine according to the present invention employs the following means.

That is, in the first aspect, a plasticizing mechanism which heats and melts the molding material and supplies it to the mold apparatus, and a molding section partitioned inside the fixed-side mold mounting plate of the mold apparatus and supplied from the plasticizing mechanism. A molding material storage chamber for storing the material, and an injection mechanism for injecting the molding material stored in the molding material storage chamber at least partially housed in the fixed mold mounting plate of the mold device into the mold of the mold device. A check valve provided on the plasticizing mechanism or on the fixed-side mold mounting plate of the mold apparatus to prevent the injected molding material from flowing back to the plasticizing mechanism side.

According to this means, the injection section of the above-mentioned conventional pre-plastic injection apparatus is structured such that it is incorporated in a fixed-side mold mounting plate of a mold apparatus. Therefore, the injection device is downsized while maintaining the function of a pre-plasticizer having a high plasticizing ability.

According to a second aspect of the present invention, in the injection molding apparatus of the first aspect, the opening / closing direction of the mold of the mold apparatus is set to the horizontal direction, and the injection stroke direction of the injection mechanism is set to the vertical direction. Are housed in a gantry supporting the mold apparatus.

In this means, a part of the injection mechanism that cannot be accommodated in the fixed-side mold mounting plate of the mold apparatus is accommodated in the gantry.

According to a third aspect of the present invention, in the injection molding apparatus of the first or second aspect, the plasticizing mechanism comprises a conical cylinder and a screw.

According to this means, the axial length of the plasticizing mechanism can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an injection molding machine according to the present invention will be described below with reference to FIGS.

The mold apparatus A of this embodiment is of a horizontal type in which the opening and closing directions of the fixed mold Ab and the movable mold Ad are set in the horizontal direction. A molding material storage chamber 1 for storing the obtained molding material P is defined.

The molding material storage chamber 1 vertically extends in the shape of a cylinder toward the base 2 (downward) supporting the mold apparatus A.
In the molding material storage chamber 1, a heat insulating material 3 is fitted on the inner wall, and the molding material P stored from cooling during solidification of the molding material P in the fixed mold Ab and the movable mold Ad is heated. It is designed to shut off.

An injection plunger 41, which is a part of the injection mechanism 4, is fitted in the molding material storage chamber 1 so as to be able to move up and down.
The injection plunger 41 lifts the molding material P stored in the molding material storage chamber 1 into the fixed mold Ab and the movable mold Ad.
Inject into A cylinder 42 and a ram 43, which are other parts of the injection machine 4 connected to the injection plunger 41 to drive the injection plunger 41 up and down, are housed in the gantry 2.

The plasticizing mechanism 5 for supplying the molding material P heated and melted into the molding material storage chamber 1 comprises a screw type extruder. As shown in detail in FIG. 2, the plasticizing mechanism 5 includes a conical-shaped cylinder 51 and a conical-shaped screw 52, and concentrates the molding material P toward the center of the conical tip. As a result, the kneading of the molding material P can be equalized by increasing the plasticizing pressure. According to the plasticizing mechanism 5, since the plasticizing pressure is considerably increased, the axial lengths of the cylinder 51 and the screw 52 can be shortened (reduced) as compared with a normal screw type extruder. In order to smoothly feed the molding material P between the cylinder 51 and the screw 52, a spiral-shaped groove 54 communicating with a hopper 53 into which a raw material of the molding material P is charged is formed in the screw 52. Have been.

A check valve 6 is provided inside the fixed-side mold mounting plate Aa of the mold apparatus A of this embodiment at the upstream of the supply of the molding material P in the molding material storage chamber 1. As shown in detail in FIGS. 3 and 4, the check valve 6 includes a ball-shaped valve body 61 housed in a supply passage 7 for the molding material P inside the fixed-side mold mounting plate Aa, and a supply passage. 7, valve seats 62, 6 which are provided on the upstream side and the downstream side of the
3 and a slit 64 provided in the valve seat 63 on the downstream side. According to this check valve 6, the molding material P extruded and supplied by the plasticizing mechanism 5 flows into the molding material storage chamber 1 through the slit 64, but is injected from the molding material storage chamber 1 by the injection mechanism 4. The material P will not flow back to the plasticizing mechanism 5 side.

According to this embodiment, the molding material P is
It is heated and melted by the plasticizing mechanism 5, supplied and stored in the molding material storage chamber 1, and injected by the injection mechanism 4 into the fixed mold Ab and the movable mold Ad. These injection mechanisms 4,
Since the plasticizing mechanism 5 is formed separately and driven individually as in the above-described conventional example, the molding material P by the injection mechanism 4 is used.
, The heating and melting of the molding material P by the plasticizing mechanism 5 can be continued. Therefore, it is possible to obtain the characteristics of the pre-plastic injection device that the plasticizing ability is high.

Further, according to this embodiment, since the injection mechanism 4 is housed in the fixed-side die mounting plate Aa of the mold apparatus A and the gantry 2 and is not exposed to the outside, the injection apparatus portion is downsized. Will be. Also. Shortening of the axial length of the plasticizing mechanism 5 also contributes to downsizing of the injection device.

Further, when the injection device portion moves back and forth with respect to the mold device A, it is not necessary to move the injection mechanism 4 back and forth, and only the plasticizing mechanism 5 needs to be moved back and forth. Can be.

As described above, in addition to the illustrated embodiment, the check valve 6 can be incorporated near the tip of the plasticizing mechanism 5.

Further, the entire injection mechanism 4 can be accommodated in the fixed mold mounting plate Aa of the mold apparatus A.

[0025]

As described above, the injection molding machine according to the present invention has a structure in which the injection section of the conventional pre-plastic injection apparatus is incorporated in the fixed-side mold mounting plate of the mold apparatus. There is an effect that the plasticizing ability can be increased without increasing the size of the injection device portion.

Furthermore, since only the plasticizing mechanism needs to be advanced and retracted by moving the injection device portion relative to the mold device, there is an effect that the mechanism for moving the injection device portion can be reduced in size.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of an injection molding machine according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an enlarged sectional view of a main part of FIG. 2;

FIG. 4 is another operation state diagram of FIG. 3;

FIG. 5 is a side view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding material storage room 2 Stand 4 Injection mechanism 5 Plasticization mechanism 51 Cylinder 52 Screw 6 Check valve A Mold device Aa Fixed side mold mounting board

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 10, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 3

FIG. 4

FIG. 2

FIG. 5

Claims (3)

[Claims] 1. A plasticizing mechanism for heating and melting a molding material and supplying it to a mold apparatus, and a molding section defined inside a fixed-side mold mounting plate of the mold apparatus and storing the molding material supplied from the plasticizing mechanism. A material storage chamber, an injection mechanism for injecting the molding material stored in the molding material storage chamber at least partially contained in the fixed-side mold mounting plate of the mold apparatus into the mold of the mold apparatus, or a plasticizing mechanism or An injection molding machine comprising: a check valve provided on a fixed-side mold mounting plate of a mold apparatus and configured to prevent a backflow of injected molding material toward a plasticizing mechanism. 2. The injection molding apparatus according to claim 1, wherein the opening / closing direction of the mold of the mold apparatus is set to the horizontal direction, the injection stroke direction of the injection mechanism is set to the vertical direction, and a part of the injection mechanism is set to the mold. An injection molding machine, which is housed in a mount supporting a mold device. 3. The injection molding machine according to claim 1, wherein the plasticizing mechanism comprises a conical cylinder and a screw.