JPS63242511A - Injection molding machine - Google Patents

Abstract

PURPOSE:To make it possible to carry out moldings in the optimum molding conditions for a plurality of molded items by using an injection molding machine and to elevate the operating efficiency of an apparatus, by combining a plurality of molds in a specified order on an injection unit and carrying out the molding under a molding condition corresponding to each mold. CONSTITUTION:When a mold 4 comes to a molding position corresponding to an injection unit 1, a mold clamping mechanism 2 works and a mold 4a moves to a position shown with a chain line and mold clamping is done by being pressed by a mold 4b. Then, an injection unit 1 forwards and a molding material is supplied in the mold 4. A molding is carried out under a molding condition set by the first setting indicator 6a. After the molding is finished, the mold is opened and the mold 4a is retreated to the position shown with a full line and knockout operation of the molded item is carried out by means of a knockout mechanism 7. Then, the mold 4 moves to a waiting position shown with a broken line and a molding for the second mold 5 coming to the molding position is carried out under a molding condition set by the second setting indicator 6b. Knockout operation of a molded item for the mold 5 is carried out by means of a knockout mechanism at position shown with a full line.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an injection molding machine that can mold a plurality of types of molded products with one machine.

<Prior art and its problems> As a method for simultaneously molding multiple types of molded products using the same resin material, a mold in which multiple cavities are provided in one mold, that is, a set mold is used. Alternatively, a method using a mold called a composite mold is known. However, depending on the shape and size of the molded product, there are cases where it is not possible to use a set mold, and in that case, molding must be done individually. 6. There were considerable restrictions on efficiently manufacturing several types of molded products.

The present invention has been made in view of these problems and for the purpose of efficiently manufacturing a plurality of types of molded products.

Means for Solving the Problems> In order to achieve the above object, an injection molding machine of the present invention has one injection unit and a mold clamping mechanism, and holds a plurality of molds. Also, a mold holding means for moving these molds in a predetermined order to molding positions corresponding to the injection unit and the mold clamping mechanism, a condition setting means for setting respective molding conditions for each mold, and a molding position. and injection unit control means for operating the injection unit under molding conditions corresponding to the mold.

Function> The injection molding machine of the present invention is configured as described above,
A number of molds are combined into one injection unit in a predetermined order, and molding is performed under optimal molding conditions for each of a plurality of types of molded products. Therefore, even if the molded products have different shapes and measurements, they are not subject to these restrictions, and the operating rate of the equipment is increased, making it possible to efficiently manufacture a plurality of types of molded products.

<Example> Next, an example in which two sets of molds are used will be described.゛Figure 1 is a plan view, in which 1 is an injection unit, 2 is a mold clamping mechanism, 3 is a mold holding mechanism, 4 and 5 are first and second molds, and 6 is a control device. , 7 and 8 are protrusion mechanisms, and 9 is a base.

The injection unit 1 is equipped with a plasticizing device [1a, a drive section 1b, a hopper 1c, etc.], and a mold clamping mechanism 2 is provided corresponding to this injection unit 1, and these are basically used for conventional normal injection molding. It is similar to the machine.

Further, the mold holding mechanism 3 holds the first and second molds 4 and 5 with a guide plate 3b (see FIG. 2) provided in the frame 30, and also uses a moving motor 3c to hold the molds 4 and 5. and 5 are reciprocated between a molding position corresponding to the injection unit 1 and a lateral standby position.

The control device g1G controls the overall operation of the injection molding machine, and has a built-in control circuit using, for example, a microcomputer, and includes an input section for setting molding conditions for the mold 4 and a display for displaying the setting results. A first setting display section 6a comprising a
A second setting display section 6b is provided which includes an input section for setting molding conditions for the mold 5 and a display section for displaying the setting results. The molding conditions include 1, for example, injection speed,
There are injection amount, primary pressure, secondary pressure, time, etc., and one hour includes injection time, cooling time, rest time, ejection time, etc. The mechanism for setting and displaying these molding conditions can basically be the same as that of a conventional ordinary injection molding machine, and in this embodiment two sets of these setting display sections are provided. It is.

FIG. 2 is a diagram schematically showing the configuration of the mold holding mechanism 3. As shown in FIG.

The guide plate 3b provided in each flare A3a has a through hole (not shown) in the center for operating the mold clamping mechanism or for inserting into the injection unit 1.

Rails 11 provided with guide portions 11a are provided above and below,
Movable plates 12 and 13 to which molds 4 and 5 are attached are slidably held. The transfer 1 PII plates 2 and 13 are interconnected by combining a connecting pin 12HI with an Ω-shaped cross section and a corresponding connecting hole 138 of the same shape. Further, elongated guide holes 14 are formed on the left and right sides of the guide plate 3b (the one on the right side is not shown), and drive pins 15 and 16 are slidably held therein. Driving pins 15 and 16 are inserted into connecting holes 12b and 13b formed in respectively. 12c and 13c are reinforcing plates for the connection hole portions. Both ends of a chain 18 that is reciprocated by a sprocket 17 attached to the output shaft of a moving motor 3C are connected to the drive pins 15 and 1G, and as the chain 18 reciprocates, the movable plates 12 and 13 move. It is driven back and forth from side to side. 19 is an idler for tensioning the chain 18.

The connection structure using the connection pin 12a and the connection hole 13a and the connection structure using the connection holes 12b and 13b and the driving pins 15 and 16 are particularly suitable for the movable plate 1 to which the mold on the movable side is attached.
2 and 13, which allows the movable plates 12 and 13 to be relatively movable in a direction perpendicular to the paper plane of FIG. The movable side of the mold (second mold 5 in the examples of FIGS. 1 and 2) can be moved without any problem. In order to enable this movement, the guide piece 11a is not provided in the central portion of the rail 11.

Next, the operation will be explained with reference to FIG. In addition, each mold 4.5
The movable sides are 4a and 5a, and the fixed sides are 4b and 5b.

The figure shows a state in which the mold holding mechanism 3 is activated, the first mold 4 is in the molding position, and the second mold 5 is in the standby position.
When the mold 4 comes to the molding position corresponding to the injection unit 1,
The mold clamping mechanism 2 operates to move the mold 4a to the position shown by the chain line, and is pressed against the mold 4b and clamped. Then, the injection units 1 to 1 move forward and the molding material is supplied to the mold 4.
Molding can be performed according to the molding conditions set on the first setting display section 6a. The molding conditions are displayed on the setting display section 6a, and the figure exemplifies the display of the stroke of the injection cylinder corresponding to the injection tray. When the molding is completed, the mold is opened and the mold 48 is moved back to the position indicated by the solid line, and the ejecting mechanism 7 ejects the molded product.

Next, the mold 4 moves to a standby position indicated by a broken line, and molding is performed on the mold 5 that has arrived at the molding position according to the molding conditions set on the second setting display section 6b. The molded product is ejected from the mold 5 by the ejecting mechanism 8 when the mold 5 is in the standby position shown by the solid line.

In this way, two types of molded products are obtained from the same resin material by alternating molding with two types of molds. Molding is performed under the molding conditions. Therefore,
Unlike set molds, there are no restrictions depending on the shape or size of the molded product; 1. The operating rate of the equipment will also increase, making it possible to efficiently manufacture two types of molded products. Furthermore, since the protruding positions for the two types of molds can be set differently as described above, there is no need to separate the molded products as in the case of set molds.

In the above, completely separate molds 4 and 5 are used.

This is an example where both the fixed side and the movable side are moved, but it is also possible to share either the fixed side or the movable side, and Figure 4 shows an example where the fixed side is shared. shows.

Reference numeral 21 denotes a shared fixed mold, and the mold holding mechanism 3 can be configured to hold and move only the movable molds 4a and 5a, thereby simplifying the structure.

Molding and ejection of the molded product can be carried out in the same manner as in the case shown in Figure 3, but since the stationary mold 21 is shared, a large space must be secured in front of the molds 4a and 5a in the standby position. be able to. Therefore, if you have insert parts or outsert parts, you can insert or outsert them at this standby position, making the work easier and improving safety. This has the advantage that the mechanism is simple.

Furthermore, when the stationary mold is shared as in this example, the stroke of the injection unit 1 can be made smaller than in the case of alternate molding, so the molding cycle can be shortened accordingly.

In addition to molding two types of molded products alternately as described above, operations such as continuous molding of only one type of molded product are also possible, and the control device 6 is equipped with a switch to select these J-1 production modes. etc. are also provided. In the case of such continuous molding of only one side, since there is no lateral movement of all the molds, the mold opening/closing stroke can be reduced, and the molding cycle can be shortened accordingly.

Although the above embodiment is an example of a horizontal injection molding machine using two types of molds, this invention can also be implemented in a case where there are three or more types of molds or a vertical injection molding machine. .

<Effects of the Invention> As is clear from the above-described embodiments, the injection molding machine of the present invention has one injection unit and a mold fi mechanism, in which a plurality of molds are predetermined for the injection unit. The molds are combined in this order, and molding is performed under molding conditions that correspond to each mold.

Therefore, even if each molded product has a different shape or weight, it is not subject to these restrictions, and a single injection molding machine can mold multiple types of molded products under optimal molding conditions. It becomes possible.

Additionally, it is possible to increase the operating rate of equipment and efficiently manufacture multiple types of molded products.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic plan view, FIG. 2 is a schematic front view of the main parts of the mold holding mechanism, and FIGS. 3 and 4 are operation explanatory views. be. DESCRIPTION OF SYMBOLS 1... Injection unit, 2... Mold clamping mechanism, 3... Mold holding mechanism, 3c... Movement motor, 4... First
Mold, 4a... Movable side die, 4b... Fixed side die, 5... Second die, 5a... Movable side die, SL+
... fixed side mold, 6 ... control device, 6a ... first setting display section, 6b ... second setting display section, 7, 8
...Ejection mechanism, 21...Common fixed side mold.

Claims (1)

[Claims] (1) In an injection molding machine having one injection unit and mold clamping mechanism, a plurality of molds are held and these molds are moved in a predetermined order to the molding position corresponding to the injection unit and mold clamping mechanism. a mold holding means; and a condition setting means for setting molding conditions for each mold. An injection unit control means for operating the injection unit under molding conditions corresponding to the mold at the molding position. An injection molding machine characterized by being equipped with.