JPH01255512A - Injection molding machine - Google Patents

Abstract

PURPOSE:To set a molding condition for respective molding section of a molded product by sliding one or both of prime movable components and an auxiliary movable component, conforming a nozzle and other runner and molding. CONSTITUTION:A fixed template 12 is provided on the upper surface of a bed 11, on the upper surface of which two guide rails 13 are installed in parallel. An X axis table 14 as a main movable component is guided by the guide rail 13 and slided up in left and right directions, while a Y axis table 19 as an auxiliary movable component is engaged with a guide rail 18. The X axis and Y axis tables 14 and 19 are slid to the position where a runner for a section to molding flange 2 of an elbow joint 1 and a nozzle are conformed with. An injection unit is lowered and clamped with a movable template 25 and an Y axis table 19, and then a molten synthetic resin material is injected into a mold by actuating an injection unit. A flange 2 is molded by said process. Then, the X axis and Y axis tables 14 and 15 are slid to the position where the runner of the section forming a straight flange 3 and the nozzle are conformed with by actuating servo-motors 16 and 21. Then, the straight flange 3 is molded after clamping.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an injection molding machine for synthetic resin materials, and particularly to an injection molding machine suitable for molding parts with complex shapes.

[Conventional technology]

Synthetic resin materials are used for various parts because they have good corrosion resistance, light weight, abrasion resistance, impact resistance, electrical insulation, etc., for example. Due to these advantages, as its range of use expands, it is required to process it into parts with complex shapes.

FIG. 4 is a perspective view of the elbow joint 1, in which a flange 2 is provided at one end, and a straight flange 3 is provided at the bent part for connecting a pipe with a smaller diameter than the elbow joint 1.
is provided, and this elbow joint 1 is provided near the other end.
A mounting seat 4 is provided for fixing the device to a frame of a device or equipment.

Conventionally, in order to injection mold parts as shown in Fig. 4, the main body 1a, flange 2, straight flange 3, and mounting seat 4 of the elbow joint 1 are individually molded, and each part is attached to the main body 1a with adhesive. or attach the flange 2, straight flange 3, and mounting seat 4 to the mold.
Insert molding is performed using a hot runner type mold that employs a pinpoint gate, in which a runner up to 100 mm is provided, and the body 1a, which has been separately molded in advance, is inserted into the mold.

[Problem that the invention seeks to solve]

The conventional methods described above each have the following problems.

The method of gluing each part such as the flange 2 has the trouble of having to perform product management for each separately molded part. Further, since an adhesion process is required, the number of work steps increases, which is time-consuming, and it is difficult to reduce manufacturing costs. Furthermore, since bonding work must be performed, it is difficult to automate part molding.

In the case of insert molding, a hot runner type mold is used, which increases the mold cost. In addition, although the molding conditions for each part such as the flange 2 are different, in order to make the cross-sectional area of the runner to each part and injection pressure loss due to the bin point gate appropriate as a whole,
It is difficult to perform molding under optimal molding conditions for each part. Furthermore, since the temperature control of the gate part becomes complicated, complicated control is required to mold each part.

Therefore, this invention does not require means such as adhesion even when producing parts with complex shapes.

Another object of the present invention is to provide an injection molding machine that can mold each part constituting the part under optimal molding conditions.

[Means for solving problems]

In order to achieve the above object, an injection molding machine according to the present invention is an injection molding machine that molds a synthetic resin material etc. by vertically moving a movable mold plate in cooperation with a fixed mold plate. The movable mold plate and the lower mold plate are the fixed mold plates, and the fixed mold plate is provided with a slidable main movable member, and the main movable member is slidable in a direction intersecting the sliding direction of the main movable member. After providing a secondary movable member, fixing a mold to the secondary movable member, and molding a part of the molded product by aligning a nozzle with one runner, one of the main movable member and the secondary movable member or The present invention is characterized in that the molding conditions can be set for each molded part of the molded product by sliding both to match the nozzle with another runner and molding other parts of the molded product. .

[For production]

For example, when molding the elbow joint 1 shown in FIG. 4, the main body 1a is first molded by blow molding or the like, and the main body 1a is inserted into a mold. Then, the runner for forming the flange 2 is matched with the nozzle, and the movable mold plate is moved and clamped to form the flange 2. When the molding of the flange 2 is completed, the movable mold plate is moved to open the mold, and one or both of the main movable member and the sub movable member are slid to match the runner and nozzle for forming the straight flange 3. , the movable mold plate is moved and the mold is clamped, and the straight flange 3 is formed. Once the straight flange 3 has been formed, the mold is moved in the same manner as described above to form the mounting seat 4.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The injection molding machine according to the present invention will be specifically explained below based on an embodiment shown in FIGS. 1 to 3.

FIG. 1 is a front view, in which a fixed mold plate 12 is provided on the upper surface of the bed 11, and two guide rails 13 are arranged in parallel on the upper surface of this fixed mold plate 12.

14 in the figure is an X-axis table 14 as a main movable member, and a guide holder 14 provided on the lower surface □ of this X-axis table 14.
a is engaged with the guide rail 13 via a linear bearing or the like. Further, a nut 15a constituting the ball screw 15 is located approximately at the center of the lower surface of the X-axis table 14.
is fixed. The axis tsb of the ball screw 15 is the third
As shown in the figure, it is connected to the output shaft of a servo motor 16 fixed to the upper surface of the fixed mold plate 12 with the longitudinal direction parallel to the guide rail 13, and the above-mentioned The X-axis table 14 is guided by the guide rail 13 and slides in the left-right direction in FIG. Note that the shaft 15b is supported by a bearing 17. Further, on the upper surface of the X-axis table 14, as shown in FIGS. 2 and 3, two guide rails 18 are arranged in parallel, with the elongated direction extending in a direction that intersects the guide rail 13 three-dimensionally at a substantially right angle. It is set up.

A guide holder 19a provided on the lower surface of the Y-axis table 19, which is a sub-movable member, is engaged with the guide rail 18 via a linear bearing or the like. Further, a nut 20a constituting a ball screw 20 is fixed approximately at the center of the lower surface of the Y-axis table 19. As shown in FIG. 1, the shaft 20b of the ball screw 20 is connected to the output shaft of a servo motor 21 fixed to the top surface of the X-axis table 14 with the elongated direction parallel to the guide rail 13. 21, the Y-axis table 19 is guided by the guide rail 18 and slides in the left-right direction in FIG. Note that the shaft 20b is supported by a bearing 22.

A mold (not shown) is fixed to the Y-axis table 19.

The fixed mold plate 12 is provided with an appropriate number of posts 23 standing upright. A fixed platen 24 is fixed to the upper end of the post 23, and a movable mold plate 25 is provided to slide vertically relative to the fixed platen 24. The movable mold plate 25 is provided with injection units such as an injection cylinder 26, a heating cylinder 27, and a nozzle touch cylinder 28.

The operation of the embodiment of the injection molding machine according to the present invention constructed as described above will be explained by taking as an example the case where the elbow joint 1 shown in FIG. 4 is molded.

A mold (not shown) is fixed to the Y-axis table 19, and the main body 1a, which has been previously formed by blow molding, is inserted into the mold, and the servo motors 16.21 are operated appropriately. When the servo motor 16.21 rotates, it is connected to its output shaft and the shafts 15b, 20b also rotate.
The X-axis table 14 and the Y-axis table 19, which have nuts 15a, 20a screwed into them, move forward or backward depending on the direction of rotation of the servo motor 16, 21, respectively.

Furthermore, the sliding direction of the X-axis table 14 and the Y-axis table 1
Since it is almost perpendicular to the sliding direction of 9, as long as it is within these sliding ranges, the amount of movement of the X-axis table 14 and Y-axis table 19 can be adjusted appropriately to position the mold at an arbitrary position. It will be done. By moving back and forth in this manner, the X-axis table 14 and the Y-axis table 19 are slid to a position where the runner of the portion of the elbow joint 1 where the flange 2 is to be formed matches the nozzle. After the injection unit is lowered and the mold is clamped by the movable mold plate 25 and the Y-axis table 19, the injection unit is operated to inject the molten synthetic resin material into the mold. As a result, the flange 2 is formed, and after being appropriately cooled, the injection unit is raised.

Next, operate the servo motor 16.21 to move the X-axis table 14 and Y-axis table 19 to the position where the runner and nozzle of the part forming the straight flange 3 match. make it slide. Then, after clamping the mold in the same manner as above, straight flange 3
to form. Furthermore, the mounting seat 4 is molded in the same way, and the fourth
The elbow joint 1 shown in the figure is completed.

In this embodiment, the main movable member is explained as the X-axis table 14 in the form of a table, but instead of the table-like main movable member, a frame-like main movable member is used, and within the frame, the Y-axis table 14
9 may be slid. In this case, the main movable member and the sub movable member intersect in a plane. Further, although a combination of a ball screw 15.20 and a servo motor 16.21 is shown as a means for sliding the main movable member and the sub movable member, other means may be used.

〔Effect of the invention〕

As explained above, according to the injection molding machine according to the present invention, the mold is moved within a plane to mold each part according to the shape of the molded product, so the injection molding machine takes into consideration the gate balance. It is possible to reduce the cost of the mold because it does not require a mold of a specific shape, and the length of the runner can be made shorter than in bin gate molding, etc., so the quantitative loss of the synthetic resin material can be reduced, making it economically advantageous.

Furthermore, since a nozzle is provided that corresponds to the molding of each part, injection pressure, injection speed, metering position, gate shape, position, etc. can be selected according to the wall thickness of each part, so each part can be molded optimally. Can be molded under certain conditions.

Moreover, since each part can be molded simply by moving the mold, the injection molding machine can be made smaller even if the molded product is large, and the molding of parts with complex shapes can be automated. .

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the injection molding machine according to the present invention; FIG. 1 is a front view of the four injection molding machines, FIG. 2 is a plan view, and FIG. 3 is a right side view. FIG. 4 is a perspective view showing an example of a part molded by this injection molding machine. 1...Elbow joint 1a...Body 2...
Flange 3...Straight flange 4...Mounting seat 12...
・Fixed template 13...Guide rail 14・
...X-axis table (main movable member) 15...Ball screw 16...Servo motor 18...Guide rail 19...Y-axis table (sub-movable member) 20...Ball screw 21...Servo motor 25... Movable template patent applicant Yamaguchi Seiki Seisakusho Co., Ltd. Figure 3 Figure 4

Claims (1)

[Scope of Claims] In an injection molding machine that molds a synthetic resin material, etc. by vertically moving a movable mold plate in cooperation with a fixed mold plate, the upper mold plate is the movable mold plate, and the lower mold plate is the fixed mold plate. a plate, a main movable member slidable on the fixed plate, a sub movable member slidable in a direction intersecting the sliding direction of the main movable member, the sub movable member After fixing the mold and molding a part of the molded product by aligning the nozzle and one runner, one or both of the main movable member and the sub movable member are slid to separate the nozzle and the other runner. An injection molding machine characterized in that molding conditions can be set for each molding part of a molded product by molding other parts of the molded product by matching the runner with the runner.