CN103128941A - Mechanical-hydraulic type double-movable-plate secondary mould closing structure of precise injection molding machine - Google Patents

Abstract

The invention provides a mechanical-hydraulic type double-movable-plate secondary mould closing structure of a precise injection molding machine and a manner. The mechanical-hydraulic type double-movable-plate secondary mould closing structure comprises a machine fixed template, a movable mould plate I, a movable mould plate II, a tail plate, a mould adjusting motor, a mould adjusting motor gear, a mould adjusting gear ring, a mould adjusting small gear, a mould closing motor, a toggle rod mechanism, a secondary mould closing oil cylinder, a fixed mould and a movable mould. The mould closing device realizes two times of mould closing actions through two driving manners of the mould closing motor and the secondary mould closing oil cylinder, so as to be used for machining thin-wall and ultrathin-wall products. Primary mould closing utilizes the mould closing motor to drive the toggle rod mechanism and the toggle rod mechanism pushes the movable mould plate I and the movable mould plate II to realize primary mould closing action. Secondary mould closing utilizes the secondary mould closing oil cylinder to provide mould closing force to push the movable mould plate II so that the mould can move continually and the secondary mould closing is realized. The mould closing device is simple and easy to operate and can effectively improve the machining precision of products. Compared with a common mould closing mechanism, the mechanical-hydraulic type double-movable-plate secondary mould closing structure has great mould closing force, can effectively prevent products from having an uneven thickness phenomenon, and is good for machining the thin-wall and ultrathin-wall products.

Description

Secondary clamping structure of mechanical hydraulic double moving plate for precision injection molding machine

Technical field:

This patent is a new structure and method of secondary mold clamping for precision injection molding machines. For the requirements of the mold clamping device in the precision injection molding process of thin-walled and ultra-thin-walled products, that is, during the injection process of the injection molding machine, the space in the mold cavity is large, the resistance during the flow of the melt is small, and the product is easy to form; mold clamping The force should be large enough to prevent flashing of the product. During the injection process of thin-walled products, due to the relatively small gap inside the mold, there will be a lot of resistance, and the mold is not easy to be filled. The double-moving plate mechanism of the injection molding machine can be used to achieve secondary mold clamping. During the injection filling process, the cavity inside the mold cavity The gap increases, the resistance of the plastic melt is greatly reduced, and the mold cavity is easy to fill. During the melt filling process, the clamping force used by the mold is transmitted to the tail plate by the toggle mechanism. Since the toggle mechanism reaches the dead point position, the crosshead has no force, and the mold clamping force is borne by the tail plate, so that it will not be damaged When the motor and the cavity are filled, the force required for the secondary mold clamping is provided by the hydraulic cylinder, which can ensure the clamping force required for the secondary mold clamping. The precision injection molding of thin-walled products can be realized by using this mechanism.

Background technique:

At present, the products produced by injection molding machines tend to be thin, small and light, and the performance requirements of injection molding machines are getting higher and higher. The mold clamping part of the injection molding machine generally adopts a one-time mold clamping method, which will cause great problems for the production of ultra-thin products. Since the cavity gap of the ultra-thin product mold is relatively small, the melt will be subjected to great resistance when flowing into the mold, the mold cannot be filled, and the processed product has defects and cannot be used. The production method of one-time mold clamping for thin-walled products has the above defects, and the two-time mold clamping method has certain advantages.

Many injection molding machines adopt a double toggle mold clamping mechanism. Through the precise braking method of the servo motor, the injection molding machine can realize the secondary mold clamping mode, which improves the performance of the injection molding machine. This secondary mold clamping method uses the precise braking ability of the servo motor to keep the toggle at the set position. At this time, the toggle is not completely straightened. After the injection part is completed, the servo motor drives the double toggle. The mechanism performs secondary mold clamping to shape the product. In this secondary mold clamping method, when the mold is filled, the force generated on the mold acts on the toggle lever. Since the toggle mechanism is not straightened, all the force generated on the mold cannot be transmitted to the tail plate, and part of it will be transmitted to the wire. The lever acts on the bearing and the tail plate. This mold clamping method will cause great damage to the toggle lever, screw and bearing, thereby reducing the service life of the injection molding machine.

Invention content:

The problem to be solved by the patent of this invention is to propose a mechanical hydraulic double-moving plate with a unique structure for the defects of thin-walled and ultra-thin-walled products that are difficult to form, as well as to improve the forming accuracy of the product and the performance of the injection molding machine. Secondary clamping structure.

The patent of the present invention can be realized, and the technical solution adopted is: a new type of precision injection molding machine mold clamping structure and mold clamping method, which is characterized in that it includes a fixed template 1, a movable mold (tool) matched with a fixed mold (tool) 2 ( tool) 13, install the second movable mold plate 3 of the movable mold (tool) 13, the first movable mold plate 4 and the second movable mold plate 3 are connected through the secondary clamping cylinder 12, and drag the first movable mold plate 4 and the second movable mold plate The toggle mechanism 11 of 3 is connected to the movable mold plate 4, and the mold adjusting motor 5 and the tail plate 10 of the mold clamping motor 7 are installed, the mold adjusting motor gear 6 for adjusting the size of the mold, the mold adjusting pinion 8 and the mold adjusting gear Circle 9, tie rod 8 are connected to tail plate 10, the first movable mold plate 4 and the second movable mold plate 3, and the fixed template 1.

During product production, the mechanical-hydraulic double-moving plate clamping mechanism needs to clamp the mold twice. The first mold clamping occurs in the plasticizing stage. First, the mold clamping motor 7 installed on the tail plate 10 drives the toggle mechanism 11 to straighten the toggle lever. The toggle lever pushes the first movable mold plate 4 and the second movable mold plate 3, The fixed mold (tool) 2 and the movable mold (tool) 13 are closed. During the mold clamping process, the piston of the secondary mold clamping cylinder 12 is always close to the direction of the tail plate 10. Then the melt injection is carried out, and after the melt injection is completed, the mechanical-hydraulic double-moving plate clamping mechanism performs the second mold clamping. At this time, the melt has entered the mold cavity, and the secondary mold clamping cylinder 12 installed on the first movable mold plate 4 starts to provide pressure to push the second movable mold plate 3 to further compress the mold, so that the mold cavity becomes the same size as the product state, the mold is opened after the cooling phase is over. The mold opening process is the secondary mold clamping cylinder 12 returning oil, dragging the second plate 3 of the movable mold to fit the first plate 4 of the movable mold, and then making the mold clamping motor 7 installed on the tail plate 10 drive the toggle mechanism 11 to open the mold , and then take out the plastic product to complete the product molding process.

Compared with the existing secondary mold clamping mechanism, the above-mentioned secondary mold clamping mechanism not only utilizes the toggle mechanism that is not easy to bend when it is in the dead point state, but also the mold clamping force is mainly borne by the tail plate 10, which can reduce the impact on the toggle mechanism and the driving force. The components of the toggle mechanism are damaged, and the hydraulic cylinder can provide a large pressure. The secondary mold clamping cylinder 12 is used to provide a strong mold clamping force for the secondary compression of the product to prevent the uneven thickness of the product.

Description of drawings:

Fig. 1 is a three-dimensional schematic diagram of a mechanical-hydraulic double-moving plate clamping mechanism;

Figure 2 is a schematic diagram of the mechanical hydraulic double-moving plate mold clamping mechanism when the mold clamping mechanism of the injection machine is opened;

Figure 3 is a schematic diagram of the mechanical-hydraulic double-moving plate mold clamping mechanism when the toggle lever is straightened and the mold is closed.

Figure 4 is a schematic diagram of the mechanical-hydraulic double-moving plate mold clamping mechanism when the secondary mold clamping of the injection machine is completed.

Fig. 5 is a schematic diagram of the connection of the double-moving plate of the mechanical-hydraulic double-moving-plate mold clamping mechanism when the secondary mold clamping of the injection machine is completed.

Detailed ways:

The patent is described in further detail below in conjunction with the accompanying drawings.

Figure 1 is a schematic diagram of the overall mold clamping structure of this patent, that is, a schematic structural diagram of a mechanical hydraulic double-moving plate mold clamping mechanism. Die one plate 4, mold adjustment motor 5, mold adjustment motor gear 6, mold clamping motor 7, mold adjustment pinion 8, mold adjustment ring gear 9, tail plate 10, toggle mechanism 11, secondary mold clamping cylinder 12, moving Die (tool) 13, piston rod 14 and pull rod 15.

Fig. 2 and Fig. 3 are the schematic diagrams of the whole one-time mold clamping. As shown in Figure 2, adjust the distance between the movable template (including the second movable template 3 and the first movable template 4) and the fixed template 1 according to the size of the mold. The mold ring gear 9, and then the mold adjustment gear ring 9 drives four mold adjustment pinions 8 to make the movable template reach the predetermined position; as shown in Fig. The lever mechanism 11 is straightened, the mold is closed, and a mold clamping is completed. At this time, the toggle mechanism 11 is straightened, and the toggle lever hits the dead point. The mold needs mold clamping force to directly act on the tail plate, which can reduce the impact on the toggle mechanism. And the damage of the parts driving the toggle mechanism prolongs the life of the mold clamping mechanism, and in the process, the piston of the secondary mold clamping cylinder 12 is always close to the direction of the tail plate 10, and the first plate 4 of the movable mold is tightly connected to the second plate 3 of the movable mold. Paste, inseparable from each other.

FIG. 4 and FIG. 5 are schematic diagrams of completion of the secondary mold clamping and a sectional view of the secondary mold clamping cylinder 12 . As shown in Figure 4, the secondary mold clamping is powered by the secondary mold clamping oil cylinder 12, which pushes the second plate 3 of the movable mold to further compress the mold, the mold cavity becomes smaller, and the product preparation is completed, so that the secondary mold clamping is successfully completed. This process Utilize the feature that the oil cylinder can provide high pressure to complete the secondary mold clamping process, thereby saving energy and protecting the environment.

Claims (5)

1. A mechanical-hydraulic double-moving plate secondary mold clamping mechanism and method for a precision injection molding machine, including the fixed platen of the machine, the first movable mold plate, the second movable mold plate, the tail plate, the mold adjusting motor, the mold adjusting motor gear, and the mold adjusting gear Ring, mold adjusting pinion, mold clamping motor, toggle mechanism, secondary mold clamping cylinder, fixed mold (tool), movable mold (tool). Its main feature is that the mold clamping device mainly realizes two mold clamping actions through the two driving modes of the mold clamping motor and the secondary mold clamping cylinder, and is used for processing thin-walled and ultra-thin-walled products. The first mold clamping is to use the mold clamping motor to drive the toggle mechanism, and the toggle mechanism pushes the first plate of the movable mold and the second plate of the movable mold to realize a mold clamping action. For the second mold clamping, the mold clamping force is provided by the secondary mold clamping oil cylinder to push the second plate of the movable mold, so that the mold continues to move, and the secondary mold clamping is realized. 2. A precision injection molding machine mechanical hydraulic double moving plate secondary mold clamping mechanism and method according to claim 1, characterized in that the movable platen is provided with two templates, and the second platen of the movable mold presses the first plate of the movable mold, Realize the secondary and modulus action. 3. According to the secondary mold clamping mechanism and method of a precision injection molding machine mechanical hydraulic double moving plate described in claims 1 and 2, two mold clamping oil cylinders are arranged on the second plate of the movable mold, and these two mold clamping oil cylinders Drive the second plate of the movable mold to press the first plate of the movable mold to realize the secondary and mold action. 4. According to claim 3, a precision injection molding machine mechanical-hydraulic double-moving plate secondary mold clamping mechanism, the two oil cylinders are arranged symmetrically along the center line, so that the second platen of the movable mold can be evenly distributed. force to prevent twisting when the sides are compressed. 5. A precision injection molding machine mechanical-hydraulic double-moving plate secondary mold clamping mechanism and method according to claims 1 and 3, the mold clamping mechanism is composed of a mold clamping motor, a toggle mechanism, and two secondary mold clamping oil cylinders , the first moving mold plate, and the second moving mold plate are the main components, which not only ensure the accuracy but also ensure sufficient accuracy.

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