WO2019028813A1

WO2019028813A1 - One-shot injection molding mold and injection molding method thereof

Info

Publication number: WO2019028813A1
Application number: PCT/CN2017/097025
Authority: WO
Inventors: 马杰
Original assignee: 深圳市桢铭科技有限公司
Priority date: 2017-08-11
Filing date: 2017-08-11
Publication date: 2019-02-14

Abstract

A one-shot injection molding mold and a method adopting the mold to perform molding, the mold comprising: a mold body, a hydraulic cylinder and a support, the hydraulic cylinder being for opening and closing the mold body and the support being for supporting the mold body. The mold and forming method can effectively avoid low yields caused by problems with molding pressure, and the manual placing of products during production which is a safety risk.

Description

One-shot injection molding die and injection molding method thereof

Technical field

The invention relates to a single injection molding die and an injection molding method thereof.

Background technique

At present, in the prior art, when preparing an H-shaped product such as a double-inlet faucet, it is usually prepared in a stepwise manner, first preparing a part, then taking it out, and then putting it into the mold again to mold another part. The product will be deformed by the influence of the injection pressure, resulting in internal damage of the product, the product can not be used, resulting in low product yield. Due to the other part of the injection molding product, it is necessary to manually place the first part of the product into the mold, which will cause the machine to be easily crushed to a serious cause and reduce the safety of the production process.

Summary of the invention

The purpose of the invention patent is to provide a mold with high product yield and safe production process and a molding method thereof. The invention adopts the following technical solutions:

A one-shot injection molding mold, characterized in that the mold comprises the following devices: a mold body, a cylinder and a bracket;

The oil cylinder is used for opening and closing a mold body, and the bracket is used for supporting the mold body;

The mold body is divided into a front mold part and a back mold part;

The front mold member includes panels (2-8), hot nozzle splitter plates (2-9) and front molds which are sequentially stacked. Board (2-3);

The rear mold member includes a rear template (2-4), a thimble panel (2-5), a thimble bottom plate (2-6) and a bottom plate (2-7) which are sequentially stacked;

A middle mold core (2) is disposed in a middle portion of the front mold plate (2-3), and a rear mold core (2) corresponding to the front mold core (2) is disposed on the rear mold plate (2-4) (3) a cavity formed between the front core (2) and the rear core (3), the cavity being symmetrically disposed in the first cavity (2-1) and the second cavity (2-2) ;

The middle portion of the panel (2-8) is provided with a positioning ring (4) for positioning the mold on the injection molding machine, so that the nozzle of the injection molding machine and the hot runner system of the mold (3-1) The injection port corresponds.

2. A single injection molding die according to claim 1, wherein said bracket is located at an upper portion of the mold body, said bracket comprising a hanging beam (5) and a support column (6), said support column ( 6) There are two, one end is connected to the panel and the bottom plate respectively, and the other end is connected to the mold beam (5).

3. A single injection molding die according to claim 1, wherein said cylinder has four, a first cylinder (44-1), a second cylinder (44-2), and a third cylinder (44). -3) and a fourth cylinder (46), the first cylinder (44-1) is located at the top of the mold body, and the second cylinder (44-2) and the third cylinder (44-3) are respectively located at the rear of the template On the side, the second cylinder (44-2) and the third cylinder (44-3) are located on a plane, and the fourth cylinder (46) can push the rear core (3) out of the cavity when the mold is opened.

4. A single injection molding die according to claim 1, wherein a front core (2) and a front core (2) are disposed in a middle portion of the front die plate (2-3). The lower part is provided with two symmetrically arranged first inclined guide columns (57), and the upper part is provided with two symmetrically disposed second inclined guide columns (58). Two symmetrical symmetric third guide columns (59) are arranged on the left and right sides.

A one-shot injection molding die according to claim 1, wherein the product (1) molded by the mold comprises a body (1-1) and a ring member on both sides of the body (1-1) (1-2); the front template (2-3) has a first gate (71) in the middle of the first cavity for forming the body (1-1) of the injection molded product (1); the front template The upper side of the second cavity has a second gate (72) and a third gate (73) for injection molding to form two annular members (1-2) of the injection molded product.

6. A single injection molding die according to claim 1, wherein the lower core (3) is provided with two symmetrically disposed first sliders (9) and a rear core (3). The upper part is provided with two symmetrically disposed second sliders (10), and the left and right sides of the rear core (3) are provided with two symmetrically disposed third sliders (11), and the rear cores (3) are arranged on both sides of the upper side. Fourth slider with two symmetrical settings (12)

7. A single injection molding die according to claim 6, wherein said fourth slider (12) is connected to a second cylinder (44-2) and a third cylinder (44-3), respectively;

The first slider (9), the second slider (10) and the third slider (11) each have a slot; the first oblique guide post (57) can be inserted into the guide slot of the first slider (9) The second oblique guide post (58) can be inserted into the guide groove of the second slider (10), and the third oblique guide post (59) can be inserted into the guide groove of the third slider (11).

A one-shot injection molding die according to claim 1, wherein the central portion of the rear core (3) has a hole, and the hole extends vertically outwardly with a rotating device, and the rotating device includes a rotating shaft ( 40), gear (41), rack (38);

One end of the rotating shaft (40) is connected to the hole of the rear core (3), and the other end is perpendicular to the rear core (3) Extending outwardly and connecting with the fourth cylinder (46), the gear (41) and the rack (38) are engaged, and the gear (41) is driven to rotate by the rack (38), thereby driving the rotation of the rotating shaft (40), so that The core (3) is rotatable as the rotating shaft (40) rotates,

A one-shot injection molding die according to claim 8, wherein said rotating shaft (40) has a first guiding sleeve (42) and a second guiding sleeve (43) at a joint with the rear die plate in the axial direction. ).

The one-shot injection molding die according to claim 1, wherein the thimble panel (2-5) is disposed at a position opposite to the second cavity with a plurality of thimbles (63), the ejector panel and the rear A return spring (65) is disposed between the templates, the return spring (65) is coupled to the spring guide (67); the ejector pin (63) is used to eject the injection molded product when the mold is opened, and the return spring (65) is used to make The thimble (63) is reset.

11. A single injection molding die according to claim 10, wherein a pin press plate (37) is disposed between the rear die plate and the first cavity and the second cavity, the pin press plate ( 37) There are a plurality of rear mold inserts (35, 36) on which the rear mold inserts (35, 36) are fitted with the thimbles (63) for ejecting the injection molded product.

12. A single injection molding die according to claim 6, wherein said first slider (9) has a first slider platen (13) and said second slider (10) has a second slider A block platen (14), a third slider (11) having a third slider platen (15), and a fourth slider (12) having a fourth slider platen (16).

13. A single injection molding die according to claim 6, wherein said mold further comprises a first shovel base (17), a second shovel base (18) and a third shovel base (19). After clamping, respectively, the first slider (9), the second slider (10) and the third slider (11) are fixed; the first shovel base (17), the second shovel base (18) and the third shovel There is also a wear plate between the base (19) and the slider.

14. A single injection molding die according to claim 6, characterized by said first slider (9), second slider (10), third slider (11) and fourth slider ( 12) is connected to one end of the first insert (31), the second insert (32), the third insert (33) and the fourth insert (34), respectively, the first insert (31) One end is located in the second cavity, and the other ends of the second insert (32), the third insert (33) and the fourth insert (34) are located in the first cavity.

15. A method of injection molding using a single injection molding die according to claims 1-14, characterized in that the method comprises the steps of:

Step one, clamping

The first slider (9), the second slider (10), the third slider (11) and the fourth slider (12) are in a core state, and the first cavity (2-1) in the mold And the cavity of the second cavity (2-2) is empty; firstly opening the heating system of the first gate (71), closing the heating system of the second gate (72) and the third gate (73) So that the first gate (71) is injection molded in the first cavity (2-1) to prepare the body (1-1) of the product (1);

Step two, opening the heating system of the second gate (72) and the third gate (73), so that the first gate (71), the second gate (72) and the third gate (73) are simultaneously heated;

Step three, open the mold,

After the body (1-1) is injection molded, the mold is opened;

The second cylinder (44-2) and the third cylinder (44-3) drive the fourth slider (12) to open, the first inclined guide post (57), the second oblique guide post (58) and the third oblique guide post (59) driving the first slider (9), respectively The two sliders (10) and the third slider (11) are opened;

The fourth cylinder (46) pushes the rotating shaft (40) to push the rear core (3) out of the cavity, and then drives the meshing rack (38) and the gear (41) through the first cylinder (44-1). Therefore, the rear core (3) is rotated by 180° along the rotating shaft of the push rod, and after the rotation is completed, the rotating shaft is driven by the fourth cylinder (46) to pull the rear core (3) back into the cavity.

At this time, in the first step, the body (1-1) of the product (1) is injection molded by the first gate (71) in the first cavity (2-1) to the second cavity;

Step four, clamping

The second cylinder (44-2) and the third cylinder (44-3) drive the fourth slider (12) to slide in the opposite direction of the step three of the mold opening step, the first oblique guide column (57), and the second oblique guide The column (58) and the third inclined guide column (59) respectively drive the first slider (9), and the second slider (10) and the third slider (11) are slidably gathered in the opposite direction of the step three opening step;

Step five, injection molding

After the step 4 is completed, the first gate (71) continues to be injection molded in the first cavity (2-1) to prepare the body (1-1) of the product (1); meanwhile, the second gate (72) and The third gate (73) injects the annular member (1-2) on both sides of the body (1-1) in the second cavity to form a complete product (1);

Step six, second mold opening

The complete product (1) formed in the second cavity is ejected by the thimble (63);

Step 7. Repeat steps 3 through 6 for continuous production.

The injection molding method according to claim 15, wherein in the third step, the core (3) is rotated by 180° along the rotating shaft of the push rod, and after the rotation is completed, the rotating shaft is driven by the fourth cylinder (46) to rotate the core. (3) Pull back the cavity, at this time, the cavity still has the first cavity (2-1) and the second cavity (2-2) which are exactly the same shape as before the rotation.

17. The injection molding method according to claim 15, wherein in step 6, the mold insert (35, 36) is engaged with the thimble (63) for ejecting the injection molded product during mold opening.

Beneficial effects:

1. Effectively avoid the problem of low yield due to molding pressure problems and safety hazards caused by manual placement of products;

2. The invention adopts a hot runner system, which greatly improves the injection efficiency, saves the material cost, and reduces the pollution to the environment.

DRAWINGS

Figure 1 is a schematic structural view of an injection molded product of the present invention;

Figure 2 is an exploded perspective view of the product of Figure 1;

Figure 3 is a perspective view of the mold of the present patent;

Figure 4 is a cross-sectional perspective view of the mold of the present patent;

Figure 5 is a perspective view taken along line B-B of Figure 4;

Figure 6 is a front view of the present invention;

Figure 7 is a view taken along line A-A of Figure 6;

Figure 8 is a C-C plan view of Figure 6;

Figure 9 is a side elevational, partial cross-sectional view of the mold of the present invention;

Figure 10 is a side elevational, partial cross-sectional view of the mold of the present invention;

Figure 11 is a side elevational, partial cross-sectional view of the mold of the present invention;

Figure 12 is a side elevational, partial cross-sectional view of the mold of the present invention;

Figure 13 is a side elevational, partial cross-sectional view of the mold of the present invention;

Figure 14 is a perspective view of different parts of the injection molded product of the present invention;

Detailed ways

The invention is further illustrated below in conjunction with specific embodiments.

The mold body is divided into a front mold part and a back mold part;

The front mold part comprises a panel (2-8), a hot nozzle splitter (2-9) and a front template (2-3) arranged in a stack;

The bracket is located at an upper portion of the mold body, and the bracket comprises a hanging beam (5) and a supporting column (6). The supporting column (6) has two ends, one end is respectively connected with the panel and the bottom plate, and the other end is connected with the die beam ( 5) Phase even. The lifting beam (5) and the supporting column (6) are located on one plane.

The cylinder has four, a first cylinder (44-1), a second cylinder (44-2), a third cylinder (44-3) and a fourth cylinder (46), the first cylinder (44-1) ) at the top of the mold body, the second cylinder (44-2) and the third cylinder (44-3) are respectively located on both sides of the rear template, the second cylinder (44-2) and the third cylinder (44-3) ) lying on a plane, the fourth cylinder (46) can push the rear core (3) out of the cavity when the mold is opened.

The front part of the front template (2-3) is provided with a front core (2) of a work shape, and the lower part of the front core (2) is provided with two symmetrically disposed first inclined guide columns (57), and the upper part is arranged There are two symmetrically disposed second inclined guide columns (58), and two symmetrically disposed third inclined guide columns (59) are disposed on the left and right sides.

The product (1) molded by the mold comprises a body (1-1) and an annular member (1-2) on both sides of the body (1-1); the front template (2-3) is located in the first type The middle portion of the cavity has a first gate (71) for forming the body (1-1) of the injection molded product (1); the front plate is located on both sides of the second cavity with a second gate (72) and a third portion A gate (73) for injection molding to form two annular members (1-2) of the injection molded product.

The fourth slider (12) is respectively connected to the second cylinder (44-2) and the third cylinder (44-3);

The first slider (9), the second slider (10) and the third slider (11) each have an aperture groove; The inclined guide post (57) can be inserted into the guide groove of the first slider (9), the second oblique guide post (58) can be inserted into the guide groove of the second slider (10), and the third oblique guide post (59) It can be inserted into the guide groove of the third slider (11).

The middle portion of the rear core (3) has a hole, and the hole extends vertically outwardly, and the rotating device comprises a rotating shaft (40), a gear (41), and a rack (38);

One end of the rotating shaft (40) is connected to the hole of the rear core (3), and the other end is perpendicularly extended. The core (3) extends outwardly to connect with the fourth cylinder (46), the gear (41) and the rack (38). Engaging with the rack (38) to drive the gear (41) to rotate, thereby driving the rotation of the rotating shaft (40), so that the rear core (3) can rotate with the rotation of the rotating shaft (40),

The rotating shaft (40) has a first guiding sleeve (42) and a second guiding sleeve (43) at a joint with the rear template in the axial direction.

The thimble panel (2-5) is disposed at a position opposite to the second cavity with a plurality of thimbles (63), and a return spring (65) is disposed between the ejector panel and the rear plate. The return spring (65) and the spring guide (67) Connection; the ejector pin (63) is used to eject the injection molded product when the mold is opened, and the return spring (65) is used to reset the ejector pin (63).

An insert pinch plate (37) is disposed between the rear die plate and the first cavity and the second cavity, and the insert pinch plate (37) has a plurality of rear die inserts (35, 36), after the mold opening The insert pins (35, 36) are fitted with thimbles (63) for ejecting the injection molded product.

The first slider (9) has a first slider pressing plate (13), the second slider (10) has a second slider pressing plate (14), and the third slider (11) has a third slider pressing plate ( 15), the fourth slider (12) has Fourth slider plate (16).

The mold further includes a first shovel base (17), a second shovel base (18) and a third shovel base (19) for fixing the first slider (9) and the second slider respectively after clamping. 10) and a third slider (11); a wear-resistant sheet is further provided between the first shovel base (17), the second shovel base (18) and the third shovel base (19) and the slider.

The first slider (9), the second slider (10), the third slider (11), and the fourth slider (12) are respectively associated with the first insert (31) and the second insert (32) The third insert (33) is connected to one end of the fourth insert (34), the other end of the first insert (31) is located in the second cavity, the second insert (32), the third insert The other end of the piece (33) and the fourth insert (34) are located in the first cavity.

During the injection molding process, when the rear core (3) is rotated by 180° with the rotating shaft (40), a first cavity is formed between the front core (2) and the shape before the rotation (2-1). And the second cavity (2-2);

The top of the mold also has a second spring (66) connected to the second slider (10) for fixing the second slider (10) after the mold is opened, the second spring (66) ) also has a baffle (68).

A guide post (56) is disposed between the front template and the rear template adjacent to the second cavity portion, and the outer side of the guide post (56) has a first guide sleeve (54) and a second guide sleeve (55).

The lower portion of the panel and the bottom plate also has a support post (69).

The ejector panel and the thimble bottom plate are fixedly connected by the struts (8) on both sides, and the struts (8) are fixed to the bottom plate by nuts.

The third insert (33) has a waterproof ring (61) thereon.

A method of injection molding using a single injection molding die as described above, the method comprising the following step:

Step one, clamping

The first slider (9), the second slider (10), the third slider (11) and the fourth slider (12) are in a core state, and the core state is that all the sliders face the core Movement, the cavity of the first cavity (2-1) and the second cavity (2-2) in the mold are all empty; firstly open the heating system of the first gate (71), close the second gate (72) and a heating system of the third gate (73), such that the first gate (71) is injection molded in the first cavity (2-1) to prepare the body (1-1) of the product (1);

Step three, open the mold,

After the body (1-1) is injection molded, the mold is opened;

The second cylinder (44-2) and the third cylinder (44-3) drive the fourth slider (12) to open (moving away from the product), the first oblique guide post (57), and the second oblique guide post (58) and the third inclined guide column (59) respectively drive the first slider (9), the second slider (10) and the third slider (11) are opened (moving away from the product);

Step four, clamping

Step five, injection molding

After the step 4 is completed, the first gate (71) continues to be injection molded in the first cavity (2-1) to prepare the body (1-1) of the other product (1); meanwhile, the second gate (72) And the third gate (73) injects the annular member (1-2) on both sides of the body (1-1) rotated by the first cavity in the third step in the second cavity to form a complete product ( 1);

Step six, second mold opening

Step 7. Repeat steps 3 through 6 for continuous production.

In the third step, the core (3) is rotated by 180° along the rotating shaft of the push rod. After the rotation is completed, the fourth cylinder (46) drives the rotating shaft to pull the rear core (3) back into the cavity, and the cavity still has the sum. The first cavity (2-1) and the second cavity (2-2) are identical in shape before rotation.

In step 6, the mold insert (35, 36) and the thimble (63) are used for the injection molded product when the mold is opened. Eject.

It is also possible to open only the heating system of the second gate (72) in step 2 according to the needs of the actual product, and to inject the annular member (1-2) only on one side of the body (1-1).

It is to be understood that the examples are not intended to limit the scope of the invention. In addition, it should be understood that various changes and modifications may be made by those skilled in the art in the form of the present invention.

Claims

A one-shot injection molding mold, characterized in that the mold comprises the following devices: a mold body, a cylinder and a bracket;

The oil cylinder is used for opening and closing a mold body, and the bracket is used for supporting the mold body;

The mold body is divided into a front mold part and a back mold part;

The front mold part comprises a panel (2-8), a hot nozzle splitter (2-9) and a front template (2-3) arranged in a stack;

The rear mold member includes a rear template (2-4), a thimble panel (2-5), a thimble bottom plate (2-6) and a bottom plate (2-7) which are sequentially stacked;

A middle mold core (2) is disposed in a middle portion of the front mold plate (2-3), and a rear mold core (2) corresponding to the front mold core (2) is disposed on the rear mold plate (2-4) (3) a cavity formed between the front core (2) and the rear core (3), the cavity being symmetrically disposed in the first cavity (2-1) and the second cavity (2-2) ;

The middle portion of the panel (2-8) is provided with a positioning ring (4) for positioning the mold on the injection molding machine, so that the nozzle of the injection molding machine and the hot runner system of the mold (3-1) The injection port corresponds.
A one-shot injection molding die according to claim 1, wherein the bracket is located at an upper portion of the mold body, and the bracket comprises a hanging beam (5) and a supporting column (6), and the supporting column (6) It has two ends, one end is connected to the panel and the bottom plate respectively, and the other end is connected to both ends of the hanging beam (5).
A one-shot injection molding die according to claim 1, wherein said cylinder has four, a first cylinder (44-1), a second cylinder (44-2), and a third cylinder (44-3). And a fourth cylinder (46), the first cylinder (44-1) is located at the top of the mold body, the second cylinder (44-2) and the third Cylinders (44-3) are respectively located on both sides of the rear plate, the second cylinder (44-2) and the third cylinder (44-3) are located on one plane, and the fourth cylinder (46) can be opened when the mold is opened. The rear core (3) ejects the cavity.
A one-shot injection molding die according to claim 1, wherein a central portion of the front die (2-3) is provided with a front core (2) and a lower core (2) There are two symmetrically arranged first inclined guide columns (57), two upper symmetric guide columns (58) are arranged on the upper side, and two symmetrically disposed third oblique guide columns are arranged on the left and right sides (59) ).
A single injection molding die according to claim 1, wherein the product (1) molded by the mold comprises a body (1-1) and a ring member on both sides of the body (1-1) (1) -2); the front template (2-3) has a first gate (71) in the middle of the first cavity for forming the body (1-1) of the injection molded product (1); The second cavity has a second gate (72) and a third gate (73) on both sides for injection molding to form two annular members (1-2) of the injection molded product.
A single injection molding die according to claim 1, wherein the lower core (3) is provided with two symmetrically disposed first sliders (9) and a rear core (3) upper portion. There are two symmetrically disposed second sliders (10), two symmetrically disposed third sliders (11) are disposed on the left and right sides of the rear core (3), and two are disposed on the upper sides of the rear core (3). A symmetrical set of fourth sliders (12).
A single injection molding die according to claim 6, wherein said fourth slider (12) is connected to a second cylinder (44-2) and a third cylinder (44-3), respectively;

The first slider (9), the second slider (10) and the third slider (11) each have a slot; the first oblique guide post (57) can be inserted into the guide slot of the first slider (9) The second oblique guide post (58) can be inserted into the second slide Among the guide grooves of the block (10), the third oblique guide post (59) can be inserted into the guide groove of the third slider (11).
A one-shot injection molding die according to claim 1, wherein a central portion of the rear core (3) has a hole, and the hole extends vertically outwardly with a rotating device, and the rotating device includes a rotating shaft (40). ), gear (41), rack (38);

One end of the rotating shaft (40) is connected to the hole of the rear core (3), and the other end is perpendicularly extended. The core (3) extends outwardly to connect with the fourth cylinder (46), the gear (41) and the rack (38). Engaging, the gear (41) is rotated by the rack (38), thereby rotating the rotating shaft (40), so that the rear core (3) can rotate with the rotation of the rotating shaft (40).
A one-shot injection molding die according to claim 8, wherein said rotating shaft (40) has a first guide sleeve (42) and a second guide sleeve (43) at a joint with the rear die plate in the axial direction.
The one-shot injection molding die according to claim 1, wherein the thimble panel (2-5) is disposed at a position opposite to the second cavity with a plurality of thimbles (63), the ejector panel and the rear template A return spring (65) is provided, the return spring (65) is connected to the spring guide (67); the ejector pin (63) is used to eject the injection molded product when the mold is opened, and the return spring (65) is used to make the thimble ( 63) Reset.
A single injection molding die according to claim 10, wherein a pin press plate (37) is disposed between the rear die plate and the first cavity and the second cavity, and the pin press plate (37) There are a plurality of rear mold inserts (35, 36) on which the rear mold inserts (35, 36) are fitted with the thimbles (63) for ejecting the injection molded product.
A one-shot injection molding die according to claim 6, wherein

The first slider (9) has a first slider pressing plate (13), the second slider (10) has a second slider pressing plate (14), and the third slider (11) has a third slider pressing plate ( 15) The fourth slider (12) has a fourth slider platen (16).
A single injection molding die according to claim 6, wherein said mold further comprises a first shovel base (17), a second shovel base (18) and a third shovel base (19). Thereafter, the first slider (9), the second slider (10), and the third slider (11) are respectively fixed; the first shovel base (17), the second shovel base (18), and the third shovel base ( 19) There is also a wear-resistant piece between the slider and the slider.
A single injection molding die according to claim 6, wherein said first slider (9), second slider (10), third slider (11) and fourth slider (12) Connected to one end of the first insert (31), the second insert (32), the third insert (33) and the fourth insert (34), respectively, the other end of the first insert (31) is located at In the two-cavity, the other ends of the second insert (32), the third insert (33) and the fourth insert (34) are located in the first cavity.
A method of injection molding using a single injection molding die according to any of claims 1-14, characterized in that the method comprises the following steps:

Step one, clamping

The first slider (9), the second slider (10), the third slider (11) and the fourth slider (12) are in a core state, and the first cavity (2-1) in the mold And the cavity of the second cavity (2-2) is empty; firstly opening the heating system of the first gate (71), closing the heating system of the second gate (72) and the third gate (73) So that the first gate (71) is injection molded in the first cavity (2-1) to prepare the body (1-1) of the product (1);

Step two, opening the heating system of the second gate (72) and the third gate (73), so that the first gate (71), the second gate (72) and the third gate (73) are simultaneously heated;

Step three, open the mold,

After the body (1-1) is injection molded, the mold is opened;

The second cylinder (44-2) and the third cylinder (44-3) drive the fourth slider (12) to open, the first inclined guide post (57), the second oblique guide post (58) and the third oblique guide post (59) driving the first slider (9), the second slider (10) and the third slider (11) are opened;

The fourth cylinder (46) pushes the rotating shaft (40) to push the rear core (3) out of the cavity, and then drives the meshing rack (38) and the gear (41) through the first cylinder (44-1). Therefore, the rear core (3) is rotated by 180° along the rotating shaft, and after the rotation is completed, the fourth cylinder (46) drives the rotating shaft to pull the rear core (3) back into the cavity.

At this time, in the first step, the body (1-1) of the product (1) is injection molded by the first gate (71) in the first cavity (2-1) to the second cavity;

Step four, clamping

The second cylinder (44-2) and the third cylinder (44-3) drive the fourth slider (12) to slide in the opposite direction of the step three of the mold opening step, the first oblique guide column (57), and the second oblique guide The column (58) and the third inclined guide column (59) respectively drive the first slider (9), and the second slider (10) and the third slider (11) are slidably gathered in the opposite direction of the step three opening step;

Step five, injection molding

After the step 4 is completed, the first gate (71) continues to be injection molded in the first cavity (2-1) to prepare the body (1-1) of the product (1); meanwhile, the second gate (72) and The third gate (73) injects the annular member (1-2) on both sides of the body (1-1) in the second cavity to form a complete product (1);

Step six, second mold opening

The complete product (1) formed in the second cavity is ejected by the thimble (63);

Step 7. Repeat steps 3 through 6 for continuous production.
The injection molding method according to claim 15, wherein in the third step, the rear core (3) is rotated by 180° along the rotating shaft, and after the rotation is completed, the fourth cylinder (46) drives the rotating shaft to rotate the rear core (3). The cavity is pulled back, and at this time, the first cavity (2-1) and the second cavity (2-2) having exactly the same shape as before the rotation are still in the cavity.
The injection molding method according to claim 15, wherein in step 6, the mold insert (35, 36) is engaged with the thimble (63) for ejecting the injection molded product during mold opening.