CN107877796A - A kind of mould of surface trimming cast gate - Google Patents

Abstract

The invention discloses a mold for automatically cutting gates, comprising a mold base (5), a lower mold (3) mounted on the mold base (5), and an upper mold matched with the lower mold (3) (6), a mold cavity (7) and a gate (11) communicating with the mold cavity (7) are arranged between the upper and lower molds (6, 3), and the mold base (5) A first cavity (5a) is opened, and a material head ejector plate (8) slidingly fitted with it is arranged in the first cavity (5a), and the material head ejector plate (8) is driven by the molding machine (12) driving, the mold for automatically cutting the gate also includes a gate thimble (9), and the molding machine drive shaft (12) can drive the gate thimble (9) to cut off the gate (11) . The invention advances gate separation before mold opening, eliminates follow-up procedures, is beneficial to production automation, and improves production efficiency.

Description

A mold for automatic gate cutting

technical field

The invention relates to the field of injection molding, in particular to a mold for automatically cutting gates.

Background technique

Usually, after plastic parts are injection molded, the material head and the product are connected through the gate, and workers need to trim the gate, which is labor-intensive and the trimming of the gate is not beautiful. The specific method is to push the product out with the thimble after the mold is opened, take out the product and remove it manually. Since the plastic has cooled at this time, the gate surface after shearing is not beautiful, and the product quality cannot be improved. It still needs multiple manual trimming to trim the gate level, which is labor-intensive and increases labor costs.

Contents of the invention

The object of the present invention is to provide a mold for automatically cutting gates for the above-mentioned defects in the prior art, which can automatically cut gates.

In order to realize the purpose of the above invention, the present invention adopts the following technical scheme: a mold for automatically cutting the gate, including a mold base, a lower mold installed on the mold base, and an upper mold matched with the lower mold. A mold cavity and a gate communicating with the mold cavity are arranged between the upper mold and the lower mold, and a first cavity is opened in the mold base, and a material that is slidably fitted is arranged in the first cavity. Head ejector plate, the material head ejector plate is driven by the driving shaft of the molding machine, the mold for automatically cutting the gate also includes a gate ejector, and the driving shaft of the molding machine drives the gate ejector to cut the gate .

In addition, the present invention also proposes the following subsidiary technical solutions:

The mold base is also provided with a second cavity communicating with the first cavity, and the mold for automatic gate cutting also includes a gate ejector plate slidingly fitted with the second cavity.

One end of the gate thimble is connected to the gate thimble plate, and the other end is arranged at the joint between the mold cavity and the gate.

The second cavity is disposed below the first cavity.

The cross section of the second cavity is smaller than the cross section of the first cavity.

The height of the second cavity is greater than the thickness of the gate ejector plate.

The mold for automatically cutting the gate also includes an elastic member arranged between the gate ejector plate and the head ejector plate.

An installation hole is opened on the gate ejector plate, and the elastic member is installed in the installation hole.

The elastic member is a spring.

Compared with the prior art, the present invention has the advantages of:

1. After the traditional plastic mold is opened, the product is connected to the gate, which requires two processes for manual shearing and separation. However, the invention advances the separation of the gate to before the mold is opened, eliminating the subsequent process, which is conducive to production automation and improves production efficiency. ;

2. During the molding process of in-mold cutting, the automation of gate separation ensures the appearance consistency of gate separation, while the traditional manual separation gate process cannot guarantee the appearance of gate separation;

3. The automation of in-mold cutting and molding avoids useless human actions in the production process, and the fully automated mechanical shearing of products ensures the consistency of quality, which has incomparable advantages over traditional molds in the mass production process of products;

4. Cut off when the gate is not cooled, the cutting is easier and the quality of the cut is better.

Description of drawings

Fig. 1 is the structure schematic diagram when the mold of automatic gate cutting of the present invention is closed.

Fig. 2 is an enlarged view of part A in Fig. 1 .

Fig. 3 is a schematic view of the structure of the automatic gate cutting mold of the present invention when the gate is cut off.

Fig. 4 is a schematic structural view of the mold opening of the automatic gate cutting mold of the present invention.

Fig. 5 is a schematic structural view of the ejection of the mold product with automatic gate cutting according to the present invention.

Detailed ways

The technical solution of the present invention will be described in further non-limiting detail below in combination with preferred embodiments and accompanying drawings.

As shown in Figures 1 to 5, the mold corresponding to a preferred embodiment of the present invention automatically cuts the gate, including a base plate 2, a mold base 5 connected to the base plate 2, and a lower mold 3 installed on the mold base 5 , an upper mold 6 matched with the lower mold 3 and a top plate 1 installed on the upper mold 6 .

A mold cavity 7 and a gate 11 communicating with the mold cavity 7 are arranged between the upper and lower molds 6 and 3, and molten plastic enters the mold cavity 7 through the gate 11 for molding. The mold base 5 has a hollow structure, and a step 5c is arranged in it. With the step 5c as the boundary, the upper side is the first cavity 5a, and the lower side is the second cavity 5b. The cross section of the second cavity 5b is smaller than that of the first cavity 5a. section.

The first cavity 5a is provided with a material head ejector plate 8 slidingly fitted thereon. The material head ejector plate 8 is equipped with a material head ejector pin 14 , and the upper end of the material head ejector pin 14 is arranged below the mold cavity 7 . When the material head ejector plate 8 moved up, the material head ejector pin 14 could eject the product formed in the mold cavity 7 .

A reset assembly 15 is arranged between the ejector plate 8 and the lower mold 3, and the reset assembly 15 includes a guide column 16 arranged between the lower mold 3 and the ejector plate 8 and a spring 17 sleeved on the guide column 16 , One end of spring 17 is offset against lower die 3, and the other end is offset against material head thimble plate 8.

In the second cavity 5b, there is provided a gate ejector plate 10 slidingly fitted therewith, and the thickness of the gate ejector plate 10 is smaller than the height of the second cavity 5b, that is, when the gate ejector plate 10 and the head ejector plate 8 are respectively placed At the bottom of the second cavity 5b and the first cavity 5a, there is still a certain gap between the gate ejector plate 10 and the head ejector plate 8 (refer to FIG. 1 and FIG. 2 ). The size of the gap is preferably equal to the thickness of the gate 11 . A gate ejector pin 9 is installed on the gate ejector plate 10 , and the other end of the gate ejector pin 9 extends below the gate 11 .

An installation hole 10 a is opened on the gate ejector plate 10 , and an elastic member 13 is arranged in the installation hole 10 a, and the upper end of the elastic member 13 is in contact with the head ejector plate 8 . The elastic member 13 is preferably a spring.

There is a molding machine drive shaft 12 under the gate ejector plate 10, which can drive the gate ejector plate 10 to move upward, so that the gate ejector pin 9 cuts off the gate 11; when the product is formed and cooled, the molding The drive shaft 12 of the machine table pushes the gate ejector plate 10 to contact with the material head ejector plate 8, and drives the material head ejector plate 8 to go upward, and pushes the product out of the mold cavity 7. When the driving shaft 12 of the molding machine moves downward, the elastic member 13 will push the gate ejector plate 10 to reset precisely.

The method of using the mold for automatic gate cutting is as follows:

The first step: (refer to FIG. 1 ) mold closing: install the upper mold 6 and the top plate 1 on the lower mold 3 .

The second step: injection molding: inject molten plastic into the mold cavity 7 .

The third step: keep the pressure.

Step 4: (Refer to Figure 3) Before the gate is cooled, the molding machine drives the gate ejector pin upwards for a certain distance to cut off the gate. At this time, the gate ejector plate 10 does not drive the material head ejector plate 8 to move.

The fifth step: (refer to FIG. 4 ) mold opening: remove the upper mold 6 and the top plate 1 from the lower mold 3 .

Step 6: (refer to FIG. 5 ) The driving shaft of the molding machine drives the gate ejector plate 10 upward, and drives the material head ejector plate 8 to move upward, and the material head ejector pin 14 ejects the formed product from the mold cavity 7 .

The mold for automatic gate cutting of the present invention can cut off the gate when the product is not cooled by setting the gate ejector plate and material head ejector plate at a certain distance, which ensures the smoothness of the gate cutting and does not require workers. Manually cut off the interface, high efficiency.

The present invention has following advantage at least:

1. After the traditional plastic mold is opened, the product is connected to the gate, which requires two processes for manual shearing and separation. However, the invention advances the separation of the gate to before the mold is opened, eliminating the subsequent process, which is conducive to production automation and improves production efficiency. ;

2. During the molding process of in-mold cutting, the automation of gate separation ensures the appearance consistency of gate separation, while the traditional manual separation gate process cannot guarantee the appearance of gate separation;

3. The automation of in-mold cutting and molding avoids useless human actions in the production process, and the fully automated mechanical shearing of products ensures the consistency of quality, which has incomparable advantages over traditional molds in the mass production process of products;

4. Cut off when the gate is not cooled, the cutting is easier and the quality of the cut is better.

It should be pointed out that the above-mentioned preferred embodiments are only to illustrate the technical conception and characteristics of the present invention, the purpose of which is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot limit the scope of the present invention. protected range. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Claims (9)

1. a kind of mould of surface trimming cast gate, including die holder (5), the lower mould (3) that is installed on the die holder (5) and with institute State the upper mould (6) that lower mould (3) is engaged, be provided between the upper and lower mould (6,3) model cavity (7) and with the model cavity (7) The cast gate (11) being connected, the die holder (5) is interior to offer the first cavity (5a), is provided with therewith in first cavity (5a) The material head ejector retainner plate (8) being slidably matched, the material head ejector retainner plate (8) are driven by forming bench drive shaft (12), it is characterised in that： The mould of the surface trimming cast gate also includes cast gate thimble (9), and the forming bench drive shaft (12) can drive the cast gate Thimble (9) cuts off the cast gate (11).

2. according to the mould of surface trimming cast gate described in claim 1, it is characterised in that：The die holder (5) is further opened with and institute The second cavity (5b) that the first cavity (5a) communicates is stated, the mould of the surface trimming cast gate also includes and second cavity The cast gate ejector retainner plate (10) that (5b) is slidably matched.

3. according to the mould of surface trimming cast gate described in claim 2, it is characterised in that：Cast gate thimble (9) one end connection In on the cast gate ejector retainner plate (10), the other end is arranged at the model cavity (7) and the cast gate (11) junction.

4. according to the mould of surface trimming cast gate described in claim 2, it is characterised in that：Second cavity (5b) is arranged at institute State below the first cavity (5a).

5. according to the mould of surface trimming cast gate described in claim 2, it is characterised in that：The section of second cavity (5b) is small In the section of first cavity (5a).

6. according to the mould of surface trimming cast gate described in claim 2, it is characterised in that：The height of second cavity (5b) is big In the thickness of the cast gate ejector retainner plate (10).

7. according to the mould of surface trimming cast gate described in claim 2, it is characterised in that：The mould of the surface trimming cast gate is also Including the elastic component (13) being arranged between the cast gate ejector retainner plate (10) and the material head ejector retainner plate (8).

8. according to the mould of surface trimming cast gate described in claim 7, it is characterised in that：Opened up on the cast gate ejector retainner plate (10) There is mounting hole (10a), the elastic component (13) is installed in the mounting hole (10a).

9. according to the mould of surface trimming cast gate described in claim 8, it is characterised in that：The elastic component (13) is spring.