Dual-color mold-based rapid positioning mold and positioning method

Abstract

The application discloses a rapid positioning mold based on a double-color mold and a positioning method, which comprises two machine bottom plates, upper molds and lower molds are respectively arranged on the inner sides of the two machine bottom plates, positioning guides are fixedly arranged on the upper molds, and positioning guide grooves matched with the positioning guides are arranged on the lower molds; the positioning guides comprise first guide columns, second guide columns and third guide columns, the positioning guide grooves comprise first guide grooves, second guide grooves and third guide grooves matched with the positioning guides, and the redundant gaps between the first guide columns and the first guide grooves, the third guide columns and the third guide grooves and the second guide columns and the second guide grooves are sequentially reduced; the first guide columns, the third guide columns and the second guide columns sequentially enter the first guide grooves, the third guide grooves and the second guide grooves, and the redundant gaps are sequentially reduced, so that the rapid and accurate mold closing of the upper molds and the lower molds is completed.

Description

Technical Field

[0001] This invention belongs to the field of mold technology, and in particular relates to a rapid positioning mold and positioning method based on a two-color mold. Background Technology

[0002] Two-color molding produces products that can have two or more types of plastic. Traditional two-color molding includes movable two-color molding and rotary two-color molding.

[0003] For rotary two-color molds, the workflow is as follows: after the first injection molding of a product is completed, the mold is opened, the upper mold (moving mold) is rotated 180°, and then the mold is closed again to inject a second product, thus completing one injection molding cycle.

[0004] Because rotary two-color molds require the upper mold to rotate 180° before a second mold closing during production, it is difficult to guarantee precise mold positioning during mold closing using existing mold manufacturing and assembly processes. Conversely, ensuring precise positioning during mold closing necessitates reducing the mold production speed. Therefore, achieving rapid and precise mold positioning is a pressing issue that needs to be addressed. Summary of the Invention

[0005] To address the problems in the prior art, the present invention proposes the following technical solution:

[0006] The rapid positioning mold and positioning method based on the dual-color mold includes two base plates, with an upper mold and a lower mold respectively installed on the inner side of the two base plates. A positioning guide is fixedly installed on the upper mold, and a positioning guide groove adapted to the positioning guide is opened on the lower mold.

[0007] The positioning guide includes a first guide post, a second guide post, and a third guide post. The positioning guide groove includes a first guide groove, a second guide groove, and a third guide groove that are adapted to it. The redundant gaps between the first guide post and the first guide groove, the third guide post and the third guide groove, and the second guide post and the second guide groove decrease sequentially.

[0008] The first guide post, the third guide post, and the second guide post enter the first guide groove, the third guide groove, and the second guide groove in sequence. As the redundant gap decreases in sequence, the upper mold and the lower mold are quickly and accurately closed.

[0009] As a preferred embodiment of the above technical solution, the outer edges of the first guide groove, the second guide groove, and the third guide groove are all machined into a trumpet shape.

[0010] As a preferred embodiment of the above technical solution, the upper mold includes a panel connecting plate and a panel, the first guide post and the second guide post are fixedly installed on the inner side of the panel connecting plate and slide through the panel, and the third guide post is fixedly installed on the inner side of the panel.

[0011] A second spring is provided between the panel connecting plate and the panel.

[0012] As a preferred embodiment of the above technical solution, the second guide post includes a rod body and a cylindrical base, and the diameter of the cylindrical base is larger than the diameter of the rod body; the panel is movably sleeved on the periphery of the rod body, and the inner diameter of the second guide groove is adapted to the cylindrical base.

[0013] As a preferred embodiment of the above technical solution, an adsorption mechanism is provided inside the lower mold, which is used to adsorb and fix the product onto the mold core of the lower mold during mold separation.

[0014] As a preferred embodiment of the above technical solution, the adsorption mechanism includes an inner cavity opened inside the lower mold, and the inner cavity is connected to the second guide groove. A piston plate is provided in the inner cavity, and a connecting pin is movably inserted into the mold core of the lower mold, and the connecting pin and the piston plate are fixed together.

[0015] During mold separation, the second guide post rises, creating a negative pressure inside the cavity. This causes the piston plate and connecting pin to move away from the upper mold, thus creating a negative pressure cavity inside the lower mold core, which in turn adsorbs and fixes the product onto the lower mold core.

[0016] As a preferred embodiment of the above technical solution, a first spring is fixedly connected to the side of the piston plate away from the connecting pin, and the other end of the first spring is fixed to the inner cavity;

[0017] Limiting blocks are fixedly connected to the inner wall of the cavity.

[0018] As a preferred embodiment of the above technical solution, the lower mold is provided with a pressure equalization hole, and the pressure equalization hole is connected to the inner cavity and the external air.

[0019] A positioning method, the positioning method being based on the aforementioned rapid positioning mold based on a two-color mold, the positioning method comprising the following steps:

[0020] S1, First color injection: The upper mold and the lower mold are closed. The first guide post, the third guide post, and the second guide post enter the first guide groove, the third guide groove, and the second guide groove in sequence. As the redundant gap decreases in sequence, the upper mold and the lower mold are closed quickly and accurately. Then, the first color injection is performed.

[0021] S2. Position Adjustment: After the first color injection is completed, the upper mold and the lower mold separate, and the machine base plate connected to the upper mold drives the upper mold to rotate 180°.

[0022] S3, Second color injection: The upper mold and lower mold are closed for the second time. The first guide post, the third guide post, and the second guide post enter the first guide groove, the third guide groove, and the second guide groove in sequence. As the redundant gap decreases in sequence, the upper mold and lower mold are closed quickly and accurately for the second time. Then, the second color injection is performed.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. In the mold of this invention, during mold closing, the first guide pillar, the third guide pillar, and the second guide pillar sequentially enter the first guide groove, the third guide groove, and the second guide groove. Since the redundant gaps between the first guide pillar and the first guide groove, the third guide pillar and the third guide groove, and the second guide pillar and the second guide groove decrease sequentially, the first guide pillar with the larger redundant gap enters the first guide groove first. This ensures that even if there is a certain deviation in the alignment accuracy between the upper and lower molds, the first guide pillar can still enter the first guide groove. After entering the first guide groove, the first guide pillar guides the subsequent mold closing process, thus assisting the third guide pillar in entering the third guide groove. Because the redundant gap between the third guide pillar and the third guide groove is even smaller, the third guide pillar provides more accurate positioning guidance for the subsequent mold closing process. Finally, the second guide pillar with the smallest redundant gap enters the second guide groove. This provides precise positioning guidance for the mold closing of the upper and lower molds. The guiding mechanism of this invention is a process of gradually reducing the redundant gap and finely adjusting the accuracy, from an initial large redundant gap that facilitates entry to a final small redundant gap with high precision. This achieves high-precision positioning without affecting the mold closing positioning efficiency.

[0025] 2. During the process of separating the upper and lower molds, in order to prevent the product from shaking or falling off the mold core of the lower mold, the present invention is equipped with an adsorption mechanism.

[0026] The adsorption mechanism includes an inner cavity formed inside the lower mold, which is connected to the second guide groove. A piston plate is installed inside the inner cavity. A connecting pin is movably inserted into the mold core of the lower mold, and the connecting pin is fixed to the piston plate. During mold separation, the panel connecting plate moves away from the panel under the elastic action of the second spring. At this time, the panel is still attached to the lower mold. Under the action of the upper mold core and the product being connected to the injection tank and the external air, the pressure of their contact part is released and they no longer adsorb and stick together. At the same time, the second guide post rises, which creates a negative pressure in the inner cavity, driving the piston plate and the connecting pin to move away from the upper mold, thereby creating a negative pressure cavity in the lower mold core, which then adsorbs and fixes the product on the lower mold core, so that the product fits tightly on the lower mold core, ensuring the positional stability of subsequent secondary injection molding. Attached Figure Description

[0027] Figure 1 The diagram shown is a three-dimensional structural schematic of the present invention in its modular state;

[0028] Figure 2 The image shown is a front view of the present invention in its modular state;

[0029] Figure 3 The image shown is a side view of the present invention in its modular state;

[0030] Figure 4 The diagram shown is a cross-sectional view of aa in the molded state of the present invention;

[0031] Figure 5The diagram shown is a cross-sectional view of aa in the mold-closed state of the present invention;

[0032] Figure 6 The diagram shown is an orthographic view of section aa during the mold-separation process of this invention;

[0033] Figure 7 What is shown is Figure 1 Enlarged view of point A in the middle.

[0034] Figure Labels

[0035] 10. Base plate; 20. Mold cavity; 21. Upper mold; 211. Panel connecting plate; 212. Panel; 22. Lower mold; 30. Positioning guide; 31. First guide post; 32. Second guide post; 33. Third guide post; 40. Positioning guide groove; 41. First guide groove; 42. Second guide groove; 43. Third guide groove; 50. Adsorption mechanism; 51. Inner cavity; 52. Piston plate; 53. Connecting pin; 54. Limiting block; 55. First spring; 56. Pressure equalizing hole; 57. Negative pressure chamber; 58. Second spring; 81. Injection groove; 82. Runner. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0037] like Figures 1-2 As shown

[0038] The rapid positioning mold and positioning method based on the dual-color mold includes two base plates 10. An upper mold 21 and a lower mold 22 are respectively installed on the inner side of the two base plates 10. A positioning guide 30 is fixedly installed on the upper mold 21, and a positioning guide groove 40 adapted to the positioning guide 30 is opened on the lower mold 22.

[0039] The positioning guide 30 includes a first guide post 31, a second guide post 32, and a third guide post 33. The positioning guide groove 40 includes a first guide groove 41, a second guide groove 42, and a third guide groove 43 that are adapted to it. The redundant gaps between the first guide post 31 and the first guide groove 41, the third guide post 33 and the third guide groove 43, and the second guide post 32 and the second guide groove 42 decrease sequentially.

[0040] The first guide post 31, the third guide post 33, and the second guide post 32 sequentially enter the first guide groove 41, the third guide groove 43, and the second guide groove 42. As the redundant gap decreases sequentially, the upper mold 21 and the lower mold 22 are quickly and accurately closed.

[0041] In this invention, during mold closing, the first guide post 31, the third guide post 33, and the second guide post 32 sequentially enter the first guide groove 41, the third guide groove 43, and the second guide groove 42. Since the redundant clearances between the first guide post 31 and the first guide groove 41, the third guide post 33 and the third guide groove 43, and the second guide post 32 and the second guide groove 42 decrease sequentially, the first guide post 31, with the larger redundant clearance, enters the first guide groove 41 first. Thus, even if there is a certain deviation in the alignment accuracy between the upper mold 21 and the lower mold 22, it can still ensure that the first guide post 31 enters the first guide groove 41. After entering the first guide groove 41, the first guide post 31 guides the subsequent mold closing process. This assists the third guide post 33 in entering the third guide groove 43. Since the redundant gap between the third guide post 33 and the third guide groove 43 is smaller, the third guide post 33 provides more accurate position guidance for the subsequent mold closing process after entering the third guide groove 43. Finally, the second guide post 32 with the smallest redundant gap enters the second guide groove 42, which can play a role in precise positioning and guidance for the mold closing of the upper mold 21 and the lower mold 22. The guidance of this invention is a process of gradually reducing the redundant gap and gradually fine-tuning the accuracy. From the initial large redundant gap that is easy to enter to the final high-precision small redundant gap, high-precision positioning can be achieved without affecting the mold closing positioning efficiency.

[0042] The outer edges of the first guide groove 41, the second guide groove 42, and the third guide groove 43 are all machined into a trumpet shape. This trumpet shape design provides auxiliary guidance during the initial stages of the first guide post 31 entering the first guide groove 41, the third guide post 33 entering the third guide groove 43, and the second guide post 32 entering the second guide groove 42, preventing them from getting stuck at the inlet end. It should be noted that the difference in inner diameter between the outer and inner openings of the trumpet-shaped edges of the first guide groove 41, the second guide groove 42, and the third guide groove 43 is greater than that of the first guide groove 41, the second guide groove 42, and the third guide groove 43. The difference in inner diameter between the second guide groove 42 and the third guide groove 43 is as follows: the difference in inner diameter between the outer and inner openings of the flared edge of the third guide groove 43 is greater than the difference in inner diameter between the first guide groove 41 and the third guide groove 43; the difference in inner diameter between the outer and inner openings of the flared edge of the second guide groove 42 is greater than the difference in inner diameter between the third guide groove 43 and the second guide groove 42. This ensures that the first guide post 31 will not get stuck when entering the first guide groove 41, the third guide post 33 will not get stuck when entering the third guide groove 43, and the second guide post 32 will not get stuck when entering the second guide groove 42.

[0043] like Figure 3 As shown

[0044] The upper mold 21 includes a panel connecting plate 211 and a panel 212. The first guide post 31 and the second guide post 32 are fixedly installed on the inner side of the panel connecting plate 211 and slide through the panel 212. The third guide post 33 is fixedly installed on the inner side of the panel 212. A second spring 58 is provided between the panel connecting plate 211 and the panel 212. In this way, when the mold is closed, the panel 212 first contacts the inner side of the lower mold 22, and then the panel connecting plate 211 and the panel 212 continue to move closer to complete the mold closing. When the mold is separated, under the action of the second spring 58, the panel connecting plate 211 and the panel 212 separate first, and at the same time, the second guide post 32 is driven to come out from the second guide groove 42. Finally, the third guide post 33 comes out from the third guide groove 43.

[0045] like Figures 4-6 As shown

[0046] The second guide post 32 includes a rod body and a cylindrical base, with the diameter of the cylindrical base being larger than the diameter of the rod body. The panel 212 is movably sleeved on the periphery of the rod body, and the inner diameter of the second guide groove 42 is adapted to the cylindrical base. Through the design of the cylindrical base, under the elastic force of the second spring 58, the panel 212 can be prevented from sliding out from the periphery of the first guide post 31 and the second guide post 32, thus playing a limiting role.

[0047] The mold of this invention also includes two sets of injection grooves 81 and runners 82. The upper mold 21 and the lower mold 22 are closed to form a mold cavity 20 for injection molding to form a product. The injection molding process of this invention is as follows:

[0048] First color injection molding: Upper mold 21 and lower mold 22 close, initially as follows... Figure 4 As shown, the first guide post 31, the third guide post 33, and the second guide post 32 sequentially enter the first guide groove 41, the third guide groove 43, and the second guide groove 42. As the redundant clearance decreases sequentially, the upper mold 21 and the lower mold 22 are quickly and accurately closed, i.e., as shown... Figure 5 As shown, the first color is then injected through the first set of injection tanks 81 and flow channels 82;

[0049] Position Adjustment: After the first color injection is completed, the upper mold 21 and the lower mold 22 separate. During the mold separation process, the panel connecting plate 211 moves away from the panel 212 under the elastic action of the second spring 58. At this time, the panel 212 is still attached to the lower mold 22, i.e. Figure 6 As shown, the base plate 10 connected to the upper mold 21 drives the upper mold 21 to rotate 180°;

[0050] Second color injection molding: The upper mold 21 and the lower mold 22 are closed for the second time. The first guide post 31, the third guide post 33, and the second guide post 32 enter the first guide groove 41, the third guide groove 43, and the second guide groove 42 in sequence. As the redundant gap decreases in sequence, the upper mold 21 and the lower mold 22 are closed quickly and accurately for the second time. Then, the second color injection is performed through another set of injection grooves 81 and runners 82.

[0051] During the process of adjusting the position of the upper mold 21 and the lower mold 22 to separate the molds, in order to prevent the product from shaking or falling off the mold core of the lower mold 22, the present invention provides an adsorption mechanism 50.

[0052] The adsorption mechanism 50 includes an inner cavity 51 opened inside the lower mold 22, and the inner cavity 51 is connected to the second guide groove 42. A piston plate 52 is provided in the inner cavity 51, and a connecting pin 53 is movably inserted into the mold core of the lower mold 22, and the connecting pin 53 and the piston plate 52 are fixed together.

[0053] like Figure 6 As shown, during mold separation, the panel connecting plate 211 moves away from the panel 212 under the elastic action of the second spring 58. At this time, the panel 212 is still attached to the lower mold 22. Under the action of the injection groove 81 and the external air, the contact part of the upper mold 21 and the product is depressurized and no longer adsorbs and sticks. At the same time, the second guide post 32 rises, which creates a negative pressure in the inner cavity 51, driving the piston plate 52 and the connecting pin 53 to move away from the upper mold 21, thereby forming a negative pressure cavity 57 in the lower mold 22, which then adsorbs and fixes the product on the lower mold 22, so that the product is tightly attached to the lower mold 22, ensuring the positional stability of the subsequent secondary injection molding.

[0054] A first spring 55 is fixedly connected to the side of the piston plate 52 away from the connecting pin 53, and the other end of the first spring 55 is fixed to the inner cavity 51; a limit block 54 is fixedly connected to the inner wall of the inner cavity 51; in the non-moving state, there is no positive or negative air pressure in the inner cavity 51, and under the action of the first spring 55, the piston plate 52 can be driven to abut against the limit block 54. At this time, the connecting pin 53 is inserted into the mold core of the lower mold 22, so that the mold core of the lower mold 22 is in a complete state, i.e. Figure 5 As shown, at this time, the upper mold core 21 and the lower mold core 22 are joined to form the mold cavity 20 for product injection molding.

[0055] A pressure equalization hole 56 is provided on the lower mold 22, and the pressure equalization hole 56 connects the inner cavity 51 and the external air. It should be noted that the inner diameter of the pressure equalization hole 56 is relatively small. Due to the small redundant gap between the second guide post 32 and the second guide groove 42, the second guide post 32 is equivalent to a "piston" in the second guide groove 42. Therefore, when the mold is separated, the rise of the second guide post 32 causes a negative pressure to be generated in the inner cavity 51. Since the overall mold closing and mold separating speed in this invention is relatively fast, in order to avoid excessive negative pressure generated in the inner cavity 51, the pressure equalization hole 56 is provided. The pressure equalization hole 56 connects the inner cavity 51 and the external air. When the second guide post 32 rises rapidly during mold separation, it can appropriately adjust the pressure in the inner cavity 51, so that a certain negative pressure is generated in the inner cavity 51 to drive the piston plate 52 down. Moreover, when the mold is closed, the second guide post 32 descends, and the pressure equalization hole 56 can balance the air pressure inside the inner cavity 51, avoiding excessive air pressure inside the mold.

[0056] like Figure 5 , Figure 7 As shown

[0057] Both panel connecting plate 211 and panel 212 have annular grooves on their adjacent sides to accommodate the second spring 58.

[0058] A positioning method, based on the aforementioned rapid positioning mold using a two-color mold, includes the following steps:

[0059] S1, First color injection: The upper mold 21 and the lower mold 22 are closed. The first guide post 31, the third guide post 33, and the second guide post 32 enter the first guide groove 41, the third guide groove 43, and the second guide groove 42 in sequence. As the redundant gap decreases in sequence, the upper mold 21 and the lower mold 22 are closed quickly and accurately, and then the first color injection is performed.

[0060] S2. Position adjustment: After the first color injection is completed, the upper mold 21 and the lower mold 22 are separated. The machine base plate 10 connected to the upper mold 21 drives the upper mold 21 to rotate 180°.

[0061] S3, Second color injection: The upper mold 21 and the lower mold 22 are closed for the second time. The first guide post 31, the third guide post 33, and the second guide post 32 enter the first guide groove 41, the third guide groove 43, and the second guide groove 42 in sequence. As the redundant gap decreases in sequence, the upper mold 21 and the lower mold 22 are closed quickly and accurately for the second time. Then, the second color injection is performed.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A rapid positioning mold based on a dual-color mold, comprising two base plates (10), wherein an upper mold (21) and a lower mold (22) are respectively installed on the inner sides of the two base plates (10), characterized in that, The upper mold (21) is fixedly installed with a positioning guide (30), and the lower mold (22) is provided with a positioning guide groove (40) that is compatible with the positioning guide (30). The positioning guide (30) includes a first guide post (31), a second guide post (32), and a third guide post (33). The positioning guide groove (40) includes a first guide groove (41), a second guide groove (42), and a third guide groove (43) that are adapted to it. The redundant gaps between the first guide post (31) and the first guide groove (41), the third guide post (33) and the third guide groove (43), and the second guide post (32) and the second guide groove (42) decrease sequentially. The first guide post (31), the third guide post (33), and the second guide post (32) enter the first guide groove (41), the third guide groove (43), and the second guide groove (42) in sequence. As the redundant gap decreases in sequence, the upper mold (21) and the lower mold (22) are quickly and accurately closed. An adsorption mechanism (50) is provided inside the lower mold (22). The adsorption mechanism (50) is used to adsorb and fix the product on the mold core of the lower mold (22) during mold separation. The adsorption mechanism (50) includes an inner cavity (51) opened inside the lower mold (22), and the inner cavity (51) is connected to the second guide groove (42). A piston plate (52) is provided in the inner cavity (51). A connecting pin (53) is movably inserted into the mold core of the lower mold (22), and the connecting pin (53) and the piston plate (52) are fixed together. When the mold is separated, the second guide post (32) rises, causing a negative pressure to be formed in the inner cavity (51), which drives the piston plate (52) and connecting pin (53) to move away from the upper mold (21), thereby forming a negative pressure cavity (57) in the mold core of the lower mold (22), which in turn adsorbs and fixes the product on the mold core of the lower mold (22).

2. The rapid positioning mold based on a dual-color mold according to claim 1, characterized in that, The outer edges of the first guide groove (41), the second guide groove (42) and the third guide groove (43) are all processed into a trumpet shape.

3. The rapid positioning mold based on a two-color mold according to claim 1, characterized in that, The upper mold (21) includes a panel connecting plate (211) and a panel (212). The first guide post (31) and the second guide post (32) are fixedly installed on the inner side of the panel connecting plate (211) and slide through the panel (212). The third guide post (33) is fixedly installed on the inner side of the panel (212). A second spring (58) is provided between the panel connecting plate (211) and the panel (212).

4. The rapid positioning mold based on a dual-color mold according to claim 1, characterized in that, The second guide post (32) includes a rod body and a cylindrical base, and the diameter of the cylindrical base is larger than the diameter of the rod body; the panel (212) is movably sleeved on the periphery of the rod body, and the inner diameter of the second guide groove (42) is adapted to the cylindrical base.

5. The rapid positioning mold based on a two-color mold according to claim 1, characterized in that, The piston plate (52) is fixedly connected to a first spring (55) on the side away from the connecting pin (53), and the other end of the first spring (55) is fixed to the inner cavity (51); A limit block (54) is fixedly connected to the inner wall of the inner cavity (51).

6. The rapid positioning mold based on a two-color mold according to claim 1, characterized in that, The lower mold (22) is provided with a pressure equalization hole (56), and the pressure equalization hole (56) connects the inner cavity (51) and the external air.

7. A positioning method, characterized in that, The positioning method employs the rapid positioning mold based on a dual-color mold as described in any one of claims 1-6, and the positioning method includes the following steps: S1, First color injection: The upper mold (21) and the lower mold (22) are closed. The first guide post (31), the third guide post (33), and the second guide post (32) enter the first guide groove (41), the third guide groove (43), and the second guide groove (42) in sequence. As the redundant gap decreases in sequence, the upper mold (21) and the lower mold (22) are closed quickly and accurately. Then the first color injection is performed. S2, Position Adjustment: After the first color injection is completed, the upper mold (21) and the lower mold (22) are separated. The base plate (10) connected to the upper mold (21) drives the upper mold (21) to rotate 180°. S3, Second color injection: The upper mold (21) and the lower mold (22) are closed for the second time. The first guide post (31), the third guide post (33), and the second guide post (32) enter the first guide groove (41), the third guide groove (43), and the second guide groove (42) in sequence. As the redundant gap decreases in sequence, the upper mold (21) and the lower mold (22) are closed quickly and accurately for the second time. Then, the second color injection is performed.

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