A two-color mold

Abstract

The present application discloses a two-color mold comprising a fixed mold and a movable mold, wherein a cavity suitable for molding a workpiece is defined between the fixed mold and the movable mold. The two-color mold also includes a core block adjustment mechanism and a core block. The core block is disposed in the cavity so that it can enter and exit the cavity. The core block adjustment mechanism is suitable for driving the core block into and out of the cavity. When the core block enters the cavity, the core block cooperates with the inner wall of the cavity to form a primary cavity suitable for primary molding and forming a primary molded portion on the workpiece. The core block adjustment mechanism then drives the core block out of the cavity, and the outer wall of the primary molded portion cooperates with the inner wall of the cavity to form a secondary cavity suitable for secondary molding and forming a secondary molded portion on the workpiece. One objective of the present application is to provide a two-color mold with a simple structure, low manufacturing cost, and good durability.

Description

Technical Field

[0001] The present application relates to the field of molds, and in particular to a two-color mold. Background Art

[0002] Two-color molds can now combine two resins with different properties or colors into a single, two-color product, reducing assembly and post-processing steps. This reduces joining and printing costs, enhances product aesthetics, and improves product quality and added value. Not only does this provide anti-slip properties and increased friction, the combination of different plastic materials also makes the product more ergonomic and provides a better feel. Two-color injection molded products offer high quality stability, easily controlled deformation, and high production yields with short molding cycles.

[0003] However, the existing two-color mold has complex structure, high manufacturing cost and poor durability, which are problems that need to be solved by those skilled in the art. Summary of the Invention

[0004] One purpose of the present application is to provide a two-color mold with a simple structure, low manufacturing cost and good durability.

[0005] In order to achieve the above objectives, the technical solutions adopted in this application are:

[0006] A two-color mold comprises a fixed mold and a movable mold, wherein a cavity suitable for molding a workpiece is defined between the fixed mold and the movable mold, the two-color mold further comprising a core block adjustment mechanism and a core block, the core block being disposed in the cavity so as to be movable therein, the core block adjustment mechanism being adapted to drive the core block into or out of the cavity;

[0007] When the core block enters the mold cavity, the core block cooperates with the inner wall of the mold cavity to form a primary mold cavity, and the primary mold cavity is suitable for primary molding and forming a primary molded part on the workpiece; then the core block adjustment mechanism drives the core block to exit the mold cavity, and the outer wall of the primary molded part cooperates with the inner wall of the mold cavity to form a secondary mold cavity, and the secondary mold cavity is suitable for secondary molding and forming a secondary molded part on the workpiece.

[0008] Two-shot molds are primarily used to mold two-color workpieces. Two-shot refers to the use of two different types (or colors) of plastic entering the mold cavity to form a single workpiece. The molded workpiece has a primary molded portion and a secondary molded portion corresponding to the two different types (or colors) of plastic. Due to the characteristics of plastic, the connection between the primary and secondary molded portions is very tight. During the injection molding process, the injection molding process of the injection molding machine can be divided into primary molding and secondary molding. Primary molding is suitable for producing the primary molded portion of the workpiece, while secondary molding is suitable for producing the secondary molded portion.

[0009] Traditional two-color molds typically use a movable mold translation or rotation method to produce two-color molds. For example, for a one-out-one product, two identical movable mold cores and two different fixed mold cores are required. By changing the position of the movable mold cores, they work with different fixed mold cores to create the primary and secondary cavities. However, in actual use, traditional two-color molds are relatively large (having at least two different cavities). If the production scale of two-color products is expanded, the number of cavities will need to be doubled to meet the needs of two-color production. (That is, if a four-out-one product is required, eight identical movable mold cores will be required to work with eight different fixed mold cores to form eight cavities.)

[0010] In addition, in traditional two-color injection molding, during each molding process, multiple movable mold cores and multiple fixed mold cores cooperate to form multiple primary cavities and secondary cavities at the same time, and perform primary molding and secondary molding at the same time. Therefore, after each molding is completed, a mold opening process is required, that is, the movable mold core and the fixed mold core are separated, so as to realize the rotation or translation of the movable mold core to realize the switching between the primary cavity and the secondary cavity, and it is also necessary to cooperate with a robot or manually remove the completed product. Taking the one-out product and movable mold rotation as an example, the two identical movable mold cores on the left and right cooperate with the two different fixed mold cores on the left and right to form a primary cavity and a secondary cavity. During each molding process, the injection molding machine simultaneously injects different plastic materials into the primary cavity and the secondary cavity, and forms the primary molding part and the secondary molding part on the workpiece. Then the mold opening process is carried out to remove the workpiece that already has the secondary molding part in the right cavity, and the movable mold is rotated so that the workpiece with the primary molding part enters the right cavity from the left cavity. The corresponding right cavity is an empty cavity because the workpiece has been removed, and then the mold is closed and the operation is repeated. In addition, the production efficiency of the two-color mold using the translation of the punch is lower, which will not be discussed here.

[0011] The inventors of this application have developed a two-color mold that uses a fixed mold, a movable mold, a core block adjustment mechanism, and a core block. During the primary molding process, the core block adjustment mechanism is used to drive the core block into the mold cavity, so that the core block cooperates with the inner wall of the mold cavity to form a primary mold cavity, and is used to mold the primary molding part. The core block adjustment mechanism is then used to adjust the position of the core block again, so that it forms a secondary mold cavity with the inner wall of the mold cavity, thereby molding the secondary molding part. This method can reduce the volume of the two-color mold. A two-color mold with one mold out only requires one movable mold core and one fixed mold core, which greatly reduces production costs. It is worth mentioning that most of the cost of mold manufacturing is concentrated in the material and processing of the mold core. Reducing the number of movable mold cores and fixed mold cores can significantly reduce the number of mold cores and reduce the processing cost of the mold cores, with a cost reduction rate of more than 40%.

[0012] In addition, the production cycle of the two-color mold of the present application will be greatly reduced. After one-time molding is completed, there is no need to open the mold or perform other operations. It is only necessary to directly use the core block adjustment mechanism to adjust the position of the core block to form a secondary cavity and directly perform the secondary molding process, which reduces the number of times the mold is opened and closed and the product is taken out, thereby reducing the production cycle and improving production efficiency. It is worth mentioning that during production, the two-color mold using the traditional solution needs to use an additional reinforcement structure at the cooling water pipe to prevent water leakage because the movable mold core needs to be moved. However, with the two-color mold of the present application, since the position of the movable mold core does not need to be changed, the cooling water pipe structure is relatively simple, the cost is further reduced, and the durability of the mold is increased to prevent water leakage and other phenomena.

[0013] More preferably, Figure 8 As shown, the core block includes a coaxially arranged central axis core block and an outer layer axis core block, and the core block adjustment mechanism is suitable for driving the central axis core block and the outer layer axis core block into the mold cavity, and cooperating with the inner wall of the mold cavity to form a primary rotating shaft portion on the workpiece, wherein the central axis core block is sleeved on the inner side of the primary rotating shaft portion and is suitable for forming a rotating shaft hole on the primary rotating shaft portion, and the outer layer axis core block is sleeved on the outer side of the primary rotating shaft portion and is suitable for forming the outer wall of the primary rotating shaft portion; then the core block adjustment mechanism drives the central axis core block and / or the outer layer axis core block to partially exit the mold cavity, and makes the inner wall of the mold cavity cooperate with the outer wall of the primary rotating shaft portion and form the secondary rotating shaft portion on the workpiece.

[0014] For some complex workpieces, particularly those requiring overmolding, where another plastic material needs to be overmolded around a first plastic material, such as a two-color workpiece with a primary rotating shaft, where a secondary rotating shaft molded from another plastic needs to be overmolded around the primary shaft, these workpieces cannot be manufactured using either the movable mold rotation method or the movable mold translation method. This is because it is impossible to create a secondary cavity that can overmold the primary shaft using only the same movable mold and different fixed molds through translation or rotation. The traditional method involves overmolding, which involves performing a primary molding operation on a single injection molding machine. The workpiece, already bearing the primary molded portion and primary rotating shaft, is removed from the primary cavity of one mold. This workpiece is then placed in a separate mold, where the secondary rotating shaft and secondary molded portion are molded using the secondary cavity in the other mold. Therefore, overmolding requires at least two injection molding machines, each with two different molds, resulting in higher manufacturing costs and lower production efficiency. Furthermore, the workpiece formed once needs to be taken out and placed in a secondary cavity, and an additional positioning mechanism needs to be provided in the secondary cavity, which further increases the production cost and reduces the yield rate.

[0015] The inventors of this application used coaxially arranged central axis core blocks and outer axis core blocks, and cooperated with other core blocks to realize the switching between the primary cavity and the secondary cavity. It is worth mentioning that two injection channels need to be provided on the two-color mold. The two injection channels are respectively connected to the first sprue and the second sprue on the workpiece. The two injection channels are used to inject different plastic materials into the primary cavity and the secondary cavity respectively. The first sprue and the second sprue are respectively arranged on the primary molding part and the secondary molding part, and the plastic material is suitable for flowing through the secondary cavity through the second sprue and entering the secondary rotating axis cavity. This setting method can avoid interference and minimize the volume and manufacturing cost of the two-color mold. The movement of the central axis core block and the outer axis core block is used to make them enter or exit the cavity and cooperate to form the primary rotating shaft part and the secondary rotating shaft part, reducing the need to replace the mold, replace the injection molding machine, and remove the product after the primary molding. The product after the secondary molding is directly formed, which reduces the cycle time and reduces the production cost.

[0016] It is worth mentioning that the center axis core block can be used to enter the mold cavity, and a rotating axis hole is formed on the primary rotating shaft portion. After the primary molding, the center axis core block is installed in the rotating axis hole, and the center axis core block is against the inner wall of the rotating axis hole, so it can play a role in positioning and centering the rotating axis hole, thereby realizing the positioning and fixation of the workpiece after the primary molding, facilitating the subsequent secondary molding of the workpiece and cooperating with the movement of other core blocks, so that the secondary molding part can be covered on the primary molding part. Therefore, this method also reduces the need for additional positioning structure, further reduces production costs, and improves production efficiency.

[0017] It is further preferred that the core block adjustment mechanism includes a core pulling mechanism and an outer core block adjustment mechanism, the outer core block adjustment mechanism is relatively arranged on the fixed mold and the movable mold, the outer layer shaft core block includes a first outer layer shaft core block and a second outer layer shaft core block, the first outer layer shaft core block and the second outer layer shaft core block are respectively relatively arranged on the fixed mold and the movable mold; when the one-time molding is performed, the core pulling mechanism is suitable for driving the central shaft core block into the mold cavity along the axial direction of the workpiece, and the outer core block adjustment mechanism is suitable for driving the first outer layer shaft core block and the second outer layer shaft core block into the mold cavity, and making the first outer layer shaft core block The top of the outer layer shaft core block contacts the top of the second outer layer shaft core block, and at this time a primary rotation shaft cavity is defined between the head of the first outer layer shaft core block and the head of the second outer layer shaft core block, and the primary rotation shaft cavity is suitable for cooperating with the central shaft core block and forming the primary rotation shaft portion; when the secondary molding is performed, the outer layer core block adjustment mechanism is suitable for adjusting the positions of the first outer layer shaft core block and the second outer layer shaft core block, and is suitable for forming a secondary rotation shaft cavity through the head of the outer layer shaft core block, the outer wall of the primary rotation shaft portion and the inner wall of the cavity, and the secondary rotation shaft cavity is suitable for molding the secondary rotation shaft portion.

[0018] It is further preferred that the fixed mold and the movable mold are respectively provided with sliding grooves matching the first outer layer shaft core block and the second outer layer shaft core block in the up and down directions, the first outer layer shaft core block and the second outer layer shaft core block can be slidably installed in the sliding grooves, and the outer layer core block adjustment mechanism includes a translation core adjustment component relatively arranged on the fixed mold and the movable mold, and the translation core adjustment component is suitable for driving the first outer layer shaft core block and the second outer layer shaft core block to slide in the sliding grooves respectively.

[0019] Another preferred embodiment is that the outer core block adjustment mechanism includes a rotary core adjustment component relatively arranged on the fixed mold and the movable mold, the rotary core adjustment component is rotatably provided with a fixed plate, and the rotary core adjustment component is suitable for driving the fixed plate to rotate forward or reverse; the outer layer shaft core block includes a first outer layer shaft core block, a second outer layer shaft core block, a third outer layer shaft core block and a fourth outer layer shaft core block, the first outer layer shaft core block and the third outer layer shaft core block are fixedly arranged on the fixed plate on the fixed mold, the second outer layer shaft core block and the fourth outer layer shaft core block are fixedly arranged on the fixed plate on the movable mold, the fixed mold and the movable mold are respectively provided with movable grooves for the outer layer shaft core blocks to move, when the one-time molding is performed. , the rotary core-aligning assembly drives the fixed plate to rotate forward, so that the third outer layer shaft core block and the fourth outer layer shaft core block exit the mold cavity, and the first outer layer shaft core block and the second outer layer shaft core block enter the mold cavity, and the heads of the first outer layer shaft core block and the second outer layer shaft core block are relatively arranged and define the first rotary shaft mold cavity; when the secondary molding is performed, the rotary core-aligning assembly drives the fixed plate to rotate reversely, and the first outer layer shaft core block and the second outer layer shaft core block exit the mold cavity, and the third outer layer shaft core block and the fourth outer layer shaft core block enter the mold cavity, and the heads of the third outer layer shaft core block and the fourth outer layer shaft core block are relatively arranged and define the secondary rotary shaft mold cavity.

[0020] It is further preferred that a core mold template and a fixed template are relatively arranged on the fixed mold and the movable mold, and the cavity is defined between the relatively arranged core mold templates. The fixed template is arranged outside the core mold template and is suitable for fixing the fixed mold and the injection molding machine and the movable mold and the injection molding machine respectively. The core mold template and the fixed template are slidably connected, and the rotary core adjustment component is fixedly installed on the fixed template. When the mold is opened, the core mold template is separated from the fixed template, and the outer shaft core block gradually disengages from the movable groove. The rotary core adjustment component is suitable for driving the fixed plate to rotate forward or reverse; when the mold is closed, the outer shaft core block gradually invades the movable groove, and the core mold template gradually conflicts with the fixed template.

[0021] It is further preferred that a reinforcing template is provided on the inner side of the fixed template, and a makeshift groove is provided on the reinforcing template for the installation and movement of the rotary core adjustment assembly and the outer shaft core block. When the mold is opened, the core template is separated from the reinforcing template, and the outer shaft core block gradually breaks away from the movable groove. When the mold is closed, the outer shaft core block gradually invades the movable groove, and the inner side of the reinforcing template gradually contacts the outer side of the core template. The reinforcing template is suitable for controlling the clamping force applied to the core template.

[0022] Another preferred embodiment is that a spring is installed between the fixed template and the core template, one end of the spring abuts the outer side of the core template, and the other end of the spring abuts the inner side of the fixed template. When the mold is closed, the spring is compressed and elastically deformed under the action of the clamping force; when the mold is opened, the spring restores the elastic deformation and drives the core template to move inward, thereby separating the core template from the fixed template.

[0023] Further preferably, the movable groove includes a translation groove, which is respectively arranged on the fixed mold and the movable mold in the up and down directions. When the mold is opened, the spring restores the elastic deformation and drives the mold core template to move inward, thereby causing the outer layer shaft core block to move outward along the translation groove; when the mold is closed, the outer layer shaft core block gradually invades the translation groove and moves inward along the translation groove, and the spring is compressed under the action of the clamping force.

[0024] It is further preferred that the movable groove includes a rotation groove, which is arranged oppositely on the fixed mold and the movable mold, and the outer layer shaft core block is suitable for rotating in the rotation groove. When the first molding is performed, the rotation core adjustment component is suitable for driving the outer layer shaft core block to rotate in the rotation groove, and making the first outer layer shaft core block and the second outer layer shaft core block relatively arranged; when the second molding is performed, the rotation core adjustment component is suitable for driving the outer layer shaft core block to rotate in the rotation groove, and making the third outer layer shaft core block and the fourth outer layer shaft core block relatively arranged.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] (1) The manufacturing cost of the two-color mold is reduced. The core block adjustment mechanism is used to control the position of the core block, so that the core block enters the mold cavity and cooperates to form a primary mold cavity. The core block adjustment mechanism is then controlled to make the core block exit the mold cavity, and cooperate with the primary molded part on the workpiece and the inner wall of the mold cavity to form a secondary mold cavity and a secondary molded part, thereby reducing the number of movable molds and fixed molds required. A set of fixed molds and movable molds can be used to realize the manufacturing of two-color products;

[0027] (2) The production cycle is significantly reduced, and the number of times the mold is opened and closed is reduced. During the production process, without opening the mold, the core block position is controlled only by the core block adjustment mechanism, thereby performing primary molding and secondary molding in sequence. Furthermore, the number of devices on the mold that control the rotation or translation of the movable mold is reduced, and the number of anti-leakage structures is reduced, making the structure of the two-color mold of the present invention simpler and the manufacturing and processing costs lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of an embodiment of a two-color mold of the present application, showing a fixed mold, a movable mold, and a workpiece;

[0029] Figure 2 A schematic diagram of a workpiece according to an embodiment of the present application, showing a primary molding portion and a secondary molding portion;

[0030] Figure 3 A schematic diagram of a workpiece according to an embodiment of the present application, showing a state in which a primary molding portion and a secondary molding portion are separated;

[0031] Figure 4 This is a schematic diagram of an embodiment of the two-color mold of the present application, showing the core block adjustment mechanism controlling the core block to form a primary cavity;

[0032] Figure 5 This is a partially enlarged schematic diagram of an embodiment of a two-color mold of the present application, showing a primary cavity;

[0033] Figure 6 This is a schematic diagram of an embodiment of a two-color mold of the present application, showing a core block adjustment mechanism controlling the core block to form a secondary cavity;

[0034] Figure 7 This is a partial enlarged view of an embodiment of the two-color mold of the present application, showing the secondary cavity;

[0035] Figure 8 This is a schematic diagram of Example 1 of the two-color mold of the present application, showing the central axis core block and the outer axis core block;

[0036] Figure 9 This is a schematic diagram of Example 1 of the two-color mold of the present application, showing that the central axis core block and the outer axis core block form a secondary rotating axis cavity;

[0037] Figure 10 This is a schematic diagram of Example 2 of the two-color mold of the present application, showing a first outer layer shaft core block and a second outer layer shaft core block;

[0038] Figure 11 This is a schematic diagram of Example 2 of the two-color mold of the present application, showing the formation of a secondary rotating shaft cavity;

[0039] Figure 12 This is a partial enlarged view of Example 2 of the two-color mold of the present application, showing the outer shaft core block;

[0040] Figure 13 This is a schematic diagram of Example 2 of the two-color mold of the present application, showing the secondary limiting portion;

[0041] Figure 14 This is a schematic diagram of an embodiment of a two-color mold of the present application in a mold closing state;

[0042] Figure 15This is a schematic diagram of an embodiment of a two-color mold of the present application in a mold-opening state;

[0043] Figure 16 This is a front view of an embodiment of a two-color mold of the present application in a mold-opening state;

[0044] Figure 17 This is a front view of an embodiment of a two-color mold of the present application in a mold-closing state;

[0045] Figure 18 This is a schematic diagram of Example 3 of the two-color mold of the present application, showing that the first outer layer shaft core block and the second outer layer shaft core block conflict with each other;

[0046] Figure 19 This is a schematic diagram of Example 3 of the two-color mold of the present application, showing the outer layer shaft core block exiting the translation groove;

[0047] Figure 20 This is a schematic diagram of Example 3 of the two-color mold of the present application, showing the outer shaft core block that is facing the rotating core alignment component;

[0048] Figure 21 This is a schematic diagram of Example 3 of the two-color mold of the present application, showing the outer shaft core block re-entering the translation groove;

[0049] Figure 22 This is a partial enlarged view of Example 3 of the two-color mold of the present application, showing the secondary rotating shaft cavity;

[0050] Figure 23 This is a schematic diagram of Example 4 of the two-color mold of the present application, showing a rotating tank.

[0051] In the figure: 1. Fixed mold; 11. Fixed mold core; 2. Moving mold; 21. Moving mold core; 3. Cavity; 31. Primary cavity; 32. Secondary cavity; 33. Primary rotary axis cavity; 34. Secondary rotary axis cavity; 4. Core block adjustment mechanism; 41. Core pulling mechanism; 42. Outer core block adjustment mechanism; 421. Translational core adjustment assembly; 422. Rotational core adjustment assembly; 4221. Fixed plate; 5. Core block; 51. Center axis core block; 52. Outer axis core block; 521. First outer axis core block; 522. Second outer axis core block; 523. Third outer axis core block ;524, the fourth outer layer shaft core block; 6, the slide groove; 7, the movable groove; 71, the translation groove; 72, the rotation groove; 8, the mold core template; 9, the fixed template; 91, the reinforcement template; 92, the clearance groove; 93, the spring; 94, the spring fixed shaft; 941, the template limiting part; 100, the workpiece; 101, the primary molding part; 102, the secondary molding part; 103, the primary rotating shaft part; 1031, the rotating shaft hole; 1032, the limiting part; 104, the secondary rotating shaft part; 1041, the secondary limiting part; 105, the first water outlet; 106, the second water outlet. DETAILED DESCRIPTION

[0052] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0053] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, the directions and positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of this application.

[0054] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0055] The terms "comprises" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0056] Two-color molds are mainly used to mold two-color workpieces 100. Two-color refers to the use of two different types (or different colors) of plastic to enter the mold cavity 3 and form a single workpiece 100. After molding, the workpiece 100 has a primary molding part 101 and a secondary molding part 102 corresponding to the above two different types (or different colors) of plastic. Due to the characteristics of the plastic, the connection between the primary molding part 101 and the secondary molding part 102 is very tight. During the injection molding process, the injection molding process of the injection molding machine can be divided into a primary molding process and a secondary molding process, wherein the primary molding is suitable for producing the primary molding part 101 on the workpiece 100, and the secondary molding is suitable for producing the secondary molding part 102 on the workpiece 100.

[0057] Traditional two-color molds are usually manufactured by the method of moving the movable mold 2 in a translational manner or rotating the movable mold 2. For example, for a one-out-one product, two identical movable mold cores 21 and two different fixed mold cores 11 are required. By changing the position of the movable mold core 21, the primary cavity 31 and the secondary cavity 32 are realized in conjunction with different fixed mold cores 11. However, in actual use, traditional two-color molds are relatively large (having at least two different cavities 3). If the production scale of two-color products is to be expanded, the number of cavities 3 needs to be doubled to meet the needs of two-color production. (That is, if a four-out-one product is required, eight identical movable mold cores 21 are required to cooperate with eight different fixed mold cores 11 to form eight cavities 3.)

[0058] In addition, in traditional two-color injection molding, during each molding process, multiple movable mold cores 21 and multiple fixed mold cores 11 cooperate to simultaneously form multiple primary cavities 31 and secondary cavities 32, and perform primary molding and secondary molding at the same time. Therefore, after each molding is completed, a mold opening process is required, that is, the movable mold core 21 and the fixed mold core 11 are separated, so as to realize the rotation or translation of the movable mold core 21 to realize the switching between the primary cavity 31 and the secondary cavity 32, and it is also necessary to cooperate with a robot or manually remove the completed molded product. Taking the example of a one-out product and the rotation of the movable mold 2, the two identical movable mold cores 21 on the left and right cooperate with the two different fixed mold cores 11 on the left and right to form a primary cavity 31 and a secondary cavity 32. During each molding process, the injection molding machine simultaneously injects different plastic materials into the primary cavity 31 and the secondary cavity 32, and forms the primary molding part 101 and the secondary molding part 102 on the workpiece 100. Then, the mold opening process is carried out to remove the workpiece 100 with the secondary molding part 102 in the right cavity 3, and the movable mold 2 is rotated so that the workpiece 100 with the primary molding part 101 enters the right cavity 3 from the left cavity 3. The corresponding right cavity 3 is an empty cavity 3 because the workpiece 100 has been removed, and then the mold is closed and the operation is repeated. In addition, the production efficiency of a two-color mold using a translational punch is lower, which will not be described here.

[0059] Based on this, the inventors of this application have developed a two-color mold, which implements Figures 1 to 23 As shown, the two-color mold includes a fixed mold 1 and a movable mold 2. A cavity 3 suitable for molding a workpiece 100 is defined between the fixed mold 1 and the movable mold 2. The two-color mold also includes a core block adjustment mechanism 4 and a core block 5. The core block 5 is arranged in the cavity 3 so as to be able to enter and exit. The core block adjustment mechanism 4 is suitable for driving the core block 5 to enter or exit the cavity 3.

[0060] When the core block 5 enters the cavity 3, the core block 5 cooperates with the inner wall of the cavity 3 to form a primary cavity 31, which is suitable for primary molding and forming a primary molding part 101 on the workpiece 100; then the core block adjustment mechanism 4 drives the core block 5 to exit the cavity 3, and the outer wall of the primary molding part 101 cooperates with the inner wall of the cavity 3 to form a secondary cavity 32, which is suitable for secondary molding and forming a secondary molding part 102 on the workpiece 100.

[0061] The inventors of this application have developed a two-color mold that uses a fixed mold 1, a movable mold 2, a core block adjustment mechanism 4, and a core block 5. During a single molding process, the core block adjustment mechanism 4 is used to drive the core block 5 into the mold cavity 3, so that the core block 5 cooperates with the inner wall of the mold cavity 3 to form a primary mold cavity 31, and is used to mold a primary molding portion 101. Subsequently, the core block adjustment mechanism 4 is used again to adjust the position of the core block 5 so that it forms a secondary mold cavity 32 with the inner wall of the mold cavity 3, thereby molding a secondary molding portion 102. This method can reduce the volume of the two-color mold. A one-out two-color mold only requires one movable mold core 21 and one fixed mold core 11, which greatly reduces production costs. It is worth mentioning that most of the cost of mold manufacturing is concentrated in the material and processing of the mold cores. Reducing the number of movable mold cores 21 and fixed mold cores 11 can greatly reduce the number of mold cores and reduce the processing cost of the mold cores, with a cost reduction rate of more than 40%.

[0062] In this specific embodiment, Figure 4 and Figure 6 As shown, the core block 5 is arranged on the top of the core block adjustment mechanism 4, and a channel for the core block 5 to pass through is opened on the fixed mold 1 and the movable mold 2, so that the core block adjustment mechanism 4 drives the core block 5 to move up and down. When performing a primary molding, the core block adjustment mechanism 4 pushes the core block 5 into the cavity 3 and cooperates with the inner wall of the cavity 3 to form a primary cavity 31 as shown in FIG. Figure 5 As shown, the first plastic material is then injected by the injection molding machine to form a primary molding part 101 as shown in FIG. Figure 6 and Figure 7 Then the core block adjustment mechanism 4 drives the core block 5 along as shown; Figure 4 The core block adjustment mechanism 4 moves in the direction of the arrow, so that the core block 5 is controlled to exit the cavity 3, and the secondary cavity 32 is formed by the head of the core block 5, the inner wall of the cavity 3 and the outer wall of the primary molding part 101. The secondary cavity 32 is used to form the secondary molding part 102. Then the mold is opened to take out the secondary molded workpiece 100, and the above steps are repeated. Even if the core block adjustment mechanism 4 drives the core block 5 along the direction of the arrow, the core block 5 is controlled to exit the cavity 3. Figure 6The core block 5 then reenters the mold cavity 3 in the direction indicated by the arrow. It is worth noting that the core block adjustment mechanism 4 can employ a variety of common methods. For example, the core block adjustment mechanism 4 can utilize a hydraulically driven piston rod to control the core block 5, thereby achieving displacement of the core block 5, or it can utilize a screw drive to achieve displacement of the core block 5. Furthermore, in addition to the up-and-down translational method for entering or exiting the mold cavity 3 as exemplified in this embodiment, the core block 5 can also enter or exit the mold cavity 3 by telescoping, left-and-right translation, or other methods, thereby forming a primary cavity 31 and a secondary cavity 32 within the mold cavity 3.

[0063] In addition, by adopting the two-color mold of the present application, the production cycle will be greatly reduced. After the one-time molding is completed, there is no need to perform operations such as mold opening. It is only necessary to directly use the core block adjustment mechanism 4 to adjust the position of the core block 5, so as to cooperate to form the secondary cavity 32, and directly perform the secondary molding process, which reduces the number of times the mold is opened and closed and the product is taken out, thereby reducing the production cycle and improving production efficiency. It is worth mentioning that when using the traditional two-color mold, since the movable mold 2 needs to be moved during production, the cooling water pipe needs to adopt an additional reinforcement structure to prevent water leakage. However, by adopting the two-color mold of the present application, since the position of the movable mold 2 does not need to be changed, the cooling water pipe structure is relatively simple, the cost is further reduced, and the durability of the mold is increased to prevent it from leaking.

[0064] For some workpieces 100 with complex shapes, especially products with coating requirements, that is, another plastic material needs to be coated on the first plastic material, for example, for a two-color workpiece 100 with a primary rotating shaft portion 103, a secondary rotating shaft portion 104 molded from another plastic needs to be coated on the outside of the primary rotating shaft portion 103. For such a workpiece 100, it is impossible to manufacture it by rotating the movable mold 2 or by translating the movable mold. The reason is that it is impossible to form a secondary cavity 32 that can coat the primary rotating shaft portion 103 by translating or rotating only by using the same movable mold core 21 with different fixed mold cores 11. The traditional method is to produce through the overmolding process, that is, first use an injection molding machine to perform a molding process, and take out the workpiece 100 that already has the primary molding part 101 and the primary rotating shaft part 103 from the primary cavity 31 of a mold; then put this workpiece 100 into another mold, and cooperate with the secondary cavity 32 in the other mold to mold the secondary rotating shaft part 104 and the secondary molding part 102 on the workpiece 100. Therefore, the production method using the overmolding process requires at least two injection molding machines, which are used in conjunction with two different molds for production, and its manufacturing cost is higher and the production efficiency is lower. In addition, the workpiece 100 that has been molded once needs to be taken out and placed in the secondary cavity 32, and another positioning mechanism needs to be set in the secondary cavity 32, which further increases the production cost and reduces the yield rate.

[0065] Therefore, the inventors proposed embodiment 1: Figure 8 As shown, the core block 5 includes a coaxially arranged central axis core block 51 and an outer layer axis core block 52, and the core block adjustment mechanism 4 is suitable for driving the central axis core block 51 and the outer layer axis core block 52 into the cavity 3, and cooperating with the inner wall of the cavity 3 to form the primary rotation shaft portion 103 on the workpiece 100, wherein the central axis core block 51 is sleeved on the inner side of the primary rotation shaft portion 103, and is suitable for forming the rotation shaft hole 1031 on the primary rotation shaft portion 103, and the outer layer axis core block 52 is sleeved on the outer side of the primary rotation shaft portion 103, and is suitable for forming the outer wall of the primary rotation shaft portion 103; then the core block adjustment mechanism 4 drives the central axis core block 51 and / or the outer layer axis core block 52 to partially exit the cavity 3, and makes the inner wall of the cavity 3 cooperate with the outer wall of the primary rotation shaft portion 103 and form the secondary rotation shaft portion 104 on the workpiece 100. As shown Figure 8 As shown, during the one-time molding, the central shaft core block 51 and the outer shaft core block 52 form a one-time rotation shaft cavity 33 suitable for molding the one-time rotation shaft portion 103 on the workpiece 100, and the central shaft core block 51 can also form a rotation shaft hole 1031; after the one-time molding is completed, according to Figure 8 The direction shown causes the core block adjustment mechanism 4 to drive the core block 5 to move, so that the outer shaft core block 52 and the center shaft core block 51 partially exit the mold cavity 3, and form a secondary rotating shaft mold cavity 34 through the primary rotating shaft portion 103, the inner wall of the mold cavity 3 and the head of the outer shaft core block 52, which is suitable for molding the secondary rotating shaft portion 104.

[0066] In this specific embodiment, the workpiece 100 is an air conditioning louver for automobiles. The workpiece 100 has a coaxially arranged primary rotating shaft portion 103 and a secondary rotating shaft portion 104 at both ends. The secondary rotating shaft portion 104 is sleeved on the outside of the primary rotating shaft portion 103, and the material of the secondary rotating shaft portion 104 is different from that of the primary rotating shaft portion 103. The rotating shaft hole 1031 coaxially arranged with the primary rotating shaft portion 103 can serve as a positioning device in the subsequent secondary molding process, facilitating its installation when used as an air conditioning louver. In addition, after the primary molding is completed, it is necessary to control the central shaft core block 51 and / or the outer shaft core block 52 to partially exit the mold cavity 3. If they completely exit the mold cavity 3, two consequences will occur. First, the two ends of the workpiece 100 will lose support, making it impossible to fix them in a fixed position in the mold cavity 3 to facilitate their subsequent secondary molding. Second, during the secondary molding process, since the rotating shaft hole 1031 of the workpiece 100 loses all support, it is prone to deformation and other problems, resulting in defects such as substandard dimensions of the finished product.

[0067] The inventors of this application have adopted a coaxially arranged central axis core block 51 and outer axis core block 52, and cooperated with other core blocks 5 to achieve the switching between the primary cavity 31 and the secondary cavity 32. It is worth mentioning that the two-shot mold needs to be provided with two injection channels, which are respectively connected to the first sprue 105 and the second sprue 106 on the workpiece 100. The two injection channels are used to inject different plastic materials into the primary cavity 31 and the secondary cavity 32, respectively. The first sprue 105 and the second sprue 106 are respectively provided on the primary molding part 101 and the secondary molding part 102, and the plastic material is suitable for flowing through the second sprue 106 through the secondary cavity 32 and into the secondary rotating axis cavity 34. This arrangement avoids interference and minimizes the volume and manufacturing cost of the two-shot mold. The movement of the central axis core block 51 and the outer axis core block 52 is utilized to make them enter or exit the cavity 3, and cooperate to form the primary rotating shaft portion 103 and the secondary rotating shaft portion 104, thereby reducing the need to replace the mold, replace the injection molding machine, and take out the product after the primary molding, and directly forming the secondary molding product, reducing the cycle time and reducing the production cost.

[0068] It is worth mentioning that the central axis core block 51 is used to enter the mold cavity 3 and cooperate with the primary rotating shaft portion 103 to form a rotating shaft hole 1031. After the primary molding, the central axis core block 51 is installed in the rotating shaft hole 1031, and the central axis core block 51 contacts the inner wall of the rotating shaft hole 1031, so that the rotating shaft hole 1031 can be positioned and centering, thereby realizing the positioning and fixation of the workpiece 100 after the primary molding, facilitating the subsequent secondary molding of the workpiece 100 and cooperating with the movement of other core blocks 5, so that the secondary molding part 102 can be covered on the primary molding part 101. Therefore, this method also reduces the need for additional positioning structure, further reduces production costs, and improves production efficiency.

[0069] However, in actual use, the two-color workpiece 100 produced by the structure of Example 1 has a secondary rotating shaft portion 104 wrapped around the primary rotating shaft portion 103 that is easy to fall off. The reason is that in order to avoid interference, the central shaft core block 51 and the outer shaft core block 52 are coaxially arranged, which limits the shape of the secondary rotating shaft cavity 34, resulting in a smaller bonding area between the molded secondary rotating shaft portion 104 and the primary rotating shaft portion 103, and poor bonding stability, resulting in easy falling off.

[0070] Therefore, the inventors further optimized and proposed Example 2: Figure 3As shown, a limiting portion 1032 is provided on the workpiece 100, and the limiting portion 1032 is provided at the tail of the primary rotating shaft portion 103. After secondary molding, the tail of the secondary rotating shaft portion 103 abuts against the head of the limiting portion 1032. The limiting portion 1032 is suitable for limiting the secondary rotating shaft portion 104 and preventing it from separating from the primary rotating shaft portion 103.

[0071] And corresponding improvements have also been made to the two-color mold, such as Figure 10 and Figure 11 As shown, the core block adjustment mechanism 4 includes a core pulling mechanism 41 and an outer core block adjustment mechanism 42. The outer core block adjustment mechanism 42 is relatively arranged on the fixed mold 1 and the movable mold 2. In this specific embodiment, they are respectively arranged on the fixed mold core 11 and the movable mold core 21. The outer layer shaft core block 52 includes a first outer layer shaft core block 521 and a second outer layer shaft core block 522. The first outer layer shaft core block 521 and the second outer layer shaft core block 522 are respectively relatively arranged on the fixed mold 1 and the movable mold 2, and in this specific embodiment In this example, the fixed mold 1 and the movable mold 2 are respectively provided with slide grooves 6 along the up and down directions, which match the first outer layer shaft core block 521 and the second outer layer shaft core block 522. The first outer layer shaft core block 521 and the second outer layer shaft core block 522 are slidably installed in the slide grooves 6. The outer layer core block adjustment mechanism 42 includes a translation core adjustment component 421 relatively arranged on the fixed mold 1 and the movable mold 2. The translation core adjustment component 421 is suitable for driving the first outer layer shaft core block 521 and the second outer layer shaft core block 522 to slide in the slide groove 6. The translation core adjustment component 421 can be a screw device, a hydraulically driven piston device, or other devices that can be easily thought of by those skilled in the art to achieve translational motion by controlling the outer layer shaft core block 52.

[0072] like Figures 10 to 12 As shown, when performing the primary molding, the core pulling mechanism 41 is suitable for driving the central shaft core block 51 into the mold cavity 3 along the axial direction of the workpiece 100, and the outer core block adjustment mechanism 42 is suitable for driving the first outer shaft core block 521 and the second outer shaft core block 522 into the mold cavity 3 respectively, and making the top of the first outer shaft core block 521 contact the top of the second outer shaft core block 522, and at this time, a primary rotation shaft cavity 33 is defined between the head of the first outer shaft core block 521 and the head of the second outer shaft core block 522, and the primary rotation shaft cavity 33 is suitable for cooperating with the central shaft core block 51 and forming the primary rotation shaft portion 103; when performing the secondary molding, the outer core block adjustment mechanism 42 is suitable for adjusting the positions of the first outer shaft core block 521 and the second outer shaft core block 522. In this specific embodiment, the first outer shaft core block 521 and the second outer shaft core block 522 are installed as shown in FIG. Figure 8The arrow shown moves within the chute 6, ultimately forming a secondary rotary shaft cavity 34 through the cooperation of the head of the outer shaft core block 52, the outer wall of the primary rotary shaft portion 103, and the inner wall of the cavity 3. The secondary rotary shaft cavity 34 is suitable for molding the secondary rotary shaft portion 104. In the second embodiment, during the primary and secondary molding processes, the central shaft core block 51 is always maintained within the cavity 3 by the action of the core pulling mechanism 41, ensuring that the size of the two-color workpiece 100 meets the required use. It can also serve as the positioning of the workpiece 100 in the subsequent secondary molding. After production is completed, the central shaft core block 51 is driven by the core pulling mechanism 41 to move axially outward, thereby achieving demolding of the workpiece 100. The power source of the core pulling mechanism 41 can be a hydraulic drive method commonly used in injection molding production.

[0073] like Figure 12 As shown, due to the movement restriction of the translational core adjustment component 421, the inner and outer inner walls of the secondary rotating shaft cavity 34 (one inner wall is the outer wall of the primary rotating shaft portion 103, and the other inner wall is the head of the first outer layer shaft core block 521) must be parallel to each other. Therefore, the shape of the formed secondary rotating shaft portion 104 is also limited. In this embodiment, the tail of the primary rotating shaft portion 103 forms a radially outward expanding skirt-shaped limiting portion 1032, and the tail of the secondary rotating shaft portion 104 also forms a similarly shaped radially outward expanding skirt-shaped secondary limiting portion 1041. Therefore, the limiting effect of the limiting portion 1032 on the secondary rotating shaft portion 104 becomes smaller, and its durability still needs to be improved.

[0074] Another preferred option is Figures 18 to 23As shown, the outer core block adjustment mechanism 42 includes a rotary core adjustment component 422 relatively arranged on the fixed mold 1 and the movable mold 2, and a fixed plate 4221 is rotatably arranged on the rotary core adjustment component 422. The rotary core adjustment component 422 is suitable for driving the fixed plate 4221 to rotate forward or reverse. In this specific embodiment, the rotary core adjustment component 422 includes a motor and a motor shaft, and a fixed plate 4221 is fixedly arranged on the motor shaft, and the motor shaft drives the fixed plate 4221 to rotate; the outer layer shaft core block 52 includes a first outer layer shaft core block 521, a second outer layer shaft core block 522, a third outer layer shaft core block 523 and a fourth outer layer shaft core block 524. The first outer layer shaft core block 521 and the third outer layer shaft core block 523 are fixedly arranged on the fixed plate 4221 on the fixed mold 1, the second outer layer shaft core block 522 and the fourth outer layer shaft core block 524 are fixedly arranged on the fixed plate 4221 on the movable mold 2, and the fixed mold 1 and the movable mold 2 are respectively provided with movable grooves 7 for the outer layer shaft core block 52 to move. When performing the first molding, the rotary core adjustment component 422 drives the fixed plate 4221 to rotate forward, so that the third outer layer shaft core block 523 and the fourth outer layer shaft core block 524 exit the mold cavity 3, and the first outer layer shaft core block 521 and the second outer layer shaft core block 522 enter the mold cavity 3, and the heads of the first outer layer shaft core block 521 and the second outer layer shaft core block 522 are arranged relative to each other and define the first rotating shaft cavity 33; when performing the second molding, the rotary core adjustment component 422 drives the fixed plate 4221 to rotate reversely, and the first outer layer shaft core block 521 and the second outer layer shaft core block 522 exit the mold cavity 3, and the third outer layer shaft core block 523 and the fourth outer layer shaft core block 524 enter the mold cavity 3, and the heads of the third outer layer shaft core block 523 and the fourth outer layer shaft core block 524 are arranged relative to each other and define the second rotating shaft cavity 34.

[0075] By using a changeable head of the outer layer shaft core block 52, even if the first outer layer shaft core block 521 and the second outer layer shaft core block 522 define the primary rotating shaft cavity 33, the third outer layer shaft core block 523 and the fourth outer layer shaft core block 524 are used to define the secondary rotating shaft cavity 34, thereby releasing the restriction of the outer layer core block adjustment mechanism 42 on the secondary rotating shaft portion 104, that is, the outer layer core block adjustment mechanism 42 drives the core block 5 to move translationally, resulting in shape restrictions on the inner and outer walls of the secondary rotating portion 104, thereby improving the connection strength between the primary rotating shaft portion 103 and the secondary rotating shaft portion 104, and making the formed workpiece 100 more durable.

[0076] More preferably, Figure 15As shown, a core template 8 and a fixed template 9 are relatively arranged on the fixed mold 1 and the movable mold 2, and a cavity 3 is defined between the relatively arranged core templates 8. The fixed template 9 is arranged on the outside of the core template 8 and is suitable for fixing the fixed mold 1 and the movable mold 2 and the injection molding machine respectively. The core template 8 and the fixed template 9 are slidably connected along the axial direction of the mold. The rotary core adjustment component 422 is fixedly installed on the fixed template 9. When the mold is opened, the core template 8 is separated from the fixed template 9, and the outer shaft core block 52 gradually disengages from the movable groove 7. The rotary core adjustment component 422 is suitable for driving the fixed plate 4221 to rotate forward or reverse; when the mold is closed, the outer shaft core block 52 gradually invades the movable groove 7, and the core template 8 gradually conflicts with the fixed template 9.

[0077] By separating the core mold template 8 and the fixed template 9 when opening the mold, the rotation core adjustment component 422 fixed on the fixed template 9 is separated from the core mold template 8, thereby achieving the separation of the outer shaft core block 52 fixed on the rotation core adjustment component 422 from the cavity 3. This approach can greatly reduce the depth of the movable groove 7 opened on the template, reduce the deformation of the mold, and prevent the low product qualification rate and the inability to produce high-precision products due to excessive deformation of the mold.

[0078] More preferably, Figure 15 As shown, a reinforcing template 91 is provided on the inner side of the fixed template 9, and a makeshift groove 92 is provided on the reinforcing template 91 for the installation and movement of the rotating core adjustment component 422 and the outer shaft core block 52. When the mold is opened, the core template 8 is separated from the reinforcing template 91, and the outer shaft core block 52 gradually breaks away from the movable groove 7. When the mold is closed, the outer shaft core block 52 gradually invades the movable groove 7, and the inner side of the reinforcing template 91 gradually contacts the outer side of the core template 8. The reinforcing template 91 is suitable for controlling the clamping force applied to the core template 8.

[0079] During the two-color injection molding process, it is necessary to consider the impact of higher clamping force and injection pressure on the final product. Since a rotary core-adjusting component 422 is provided on the mold, it occupies a part of the mold space, so it is necessary to reduce its impact on the mold strength, add a reinforcement template 91, and open a makeshift groove 92 on the reinforcement template 91 for the installation and movement of the rotary core-adjusting component 422 and the outer shaft core block 52, so that the reinforcement template 91 can resist the outer side of the mold core template 8, thereby further improving the overall strength of the mold.

[0080] Another preferred option is Figure 16 and Figure 17 As shown, a spring 93 is installed between the fixed template 9 and the core template 8, one end of the spring 93 abuts the outer side of the core template 8, and the other end of the spring 93 abuts the inner side of the fixed template 9. When the mold is closed, the spring 93 is compressed and elastically deformed under the action of the clamping force; when the mold is opened, the spring 93 restores the elastic deformation and drives the core template 8 to move inward, thereby separating the core template 8 from the fixed template 9.

[0081] Utilizing the spring 93 to separate the core mold plate 8 and the fixed mold plate 9 allows the rotary core adjustment component 422 fixed on the fixed mold plate 9 to be separated, thereby enabling the outer shaft core block 52 to detach from the cavity 3, and minimizing the space required for the rotary core adjustment component 422 to rotate, thereby reducing the waste of mold space and reducing the volume of the mold while ensuring that the mold strength remains unchanged. It is worth mentioning that the spring 93 is sleeved on the spring fixed shaft 94, and the end of the spring fixed shaft 94 is provided with a radially outwardly protruding template limiter 941. The template limiter 941 is used to limit the maximum moving distance between the core mold plate 8 and the fixed mold plate 9 when the spring 93 recovers its elastic deformation when the mold is opened. In addition, the spring fixed shafts 94 on the fixed mold 1 and the movable mold 2 are staggered to prevent interference. Figure 16 As shown in the direction of the arrows, the fixed mold 1 and the movable mold 2 move inward at the same time and close the mold.

[0082] Example 3: The movable groove 7 includes a translation groove 71, which is respectively arranged on the fixed mold 1 and the movable mold 2 in the up and down directions. When the mold is opened, the spring 93 restores the elastic deformation and drives the mold core template 8 to move inward, thereby causing the outer layer shaft core block 52 to move outward along the translation groove 71; when the mold is closed, the outer layer shaft core block 52 gradually invades the translation groove 71 and moves inward along the translation groove 71, and the spring 93 is pressed under the action of the clamping force.

[0083] During the primary molding process, the rotating core aligning assembly 422 controls the first outer layer shaft core block 521 and the second outer layer shaft core block 522 to be relatively arranged as follows: Figure 18 As shown, a primary rotation shaft cavity 33 is defined between the first outer layer shaft core block 521 and the second outer layer shaft core block 522, and the other core blocks 5 cooperate to form a primary cavity 31 under the action of the core block adjustment mechanism 4, and then perform a primary molding to form a primary rotation shaft portion; then as shown in FIG. Figure 18 The mold is opened in the direction of the rotation axis 71, thereby separating the fixed mold 1 and the movable mold 2, and under the elastic force of the spring 93, the mold core template 8 and the fixed template 9 are separated, and the first outer layer shaft core block 521 and the second outer layer shaft core block 522 move outward along the translation groove 71 as shown in FIG. Figure 19 As shown; then Figure 19 As shown, the rotation centering assembly 422 is controlled to rotate forward or reverse in the direction indicated by the arrow, so that the third outer layer shaft core block 523 and the fourth outer layer shaft core block 524 are relatively arranged as shown in FIG. Figure 20 As shown; then follow the Figure 20 The mold is closed in the direction indicated by the arrow, and the third outer layer shaft core block 523 and the fourth outer layer shaft core block 524 gradually invade the translation groove 71, and finally their heads collide with each other to form a secondary rotation shaft cavity 34 for molding the secondary rotation shaft part 104.

[0084] Directly opening the translation groove 71 on the upper edge of the fixed mold 1 and the movable mold 2 can minimize the impact of the opening of the movable groove 7 on the mold strength, prevent deformation under a large clamping pressure, and cause low yield of the final workpiece 100.

[0085] Example 4: Figure 23 As shown, the movable groove 7 includes a translation groove 71 and a rotation groove 72. The rotation grooves 72 are arranged oppositely on the fixed mold 1 and the movable mold 2. The outer layer shaft core block 52 is suitable for rotating in the rotation groove 72. When performing the first molding, the rotation core adjustment component 422 is suitable for driving the outer layer shaft core block 52 to rotate in the rotation groove 72, and making the first outer layer shaft core block 521 and the second outer layer shaft core block 522 relatively arranged; when performing the second molding, the rotation core adjustment component 422 is suitable for driving the outer layer shaft core block 52 to rotate in the rotation groove 72, and making the third outer layer shaft core block 523 and the fourth outer layer shaft core block 524 relatively arranged.

[0086] In Example 4, both the translation groove 71 and the rotation groove 72 are provided. During the mold opening process, the fixed mold plate 9 and the core mold plate 8 are separated by the action of the spring 93, so that the outer core block 52 gradually exits the translation groove 71 and then rotates within the rotation groove 72, thereby achieving a variety of changes in the outer core block 52. The translation groove 71 and the rotation groove 72 are provided on the fixed mold 1 and the movable mold 2 to reduce the separation distance between the fixed mold plate 9 and the core mold plate 8. In combination with the reinforcement mold plate 91, this increases the strength of the mold, reduces its deformation under the action of the clamping force, and saves mold volume.

[0087] The above describes the basic principles, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments. The above-described embodiments and the specification merely illustrate the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A two-color mold, comprising a fixed mold and a movable mold, wherein a cavity suitable for molding a workpiece is defined between the fixed mold and the movable mold, characterized in that: The two-color mold further includes a core block adjustment mechanism and a core block, wherein the core block is arranged in the mold cavity so as to be able to enter and exit the mold cavity, and the core block adjustment mechanism is suitable for driving the core block to enter or exit the mold cavity; When the core block enters the mold cavity, the core block cooperates with the inner wall of the mold cavity to form a primary mold cavity, and the primary mold cavity is suitable for primary molding and forming a primary molded part on the workpiece; then the core block adjustment mechanism drives the core block to exit the mold cavity, and the outer wall of the primary molded part cooperates with the inner wall of the mold cavity to form a secondary mold cavity, and the secondary mold cavity is suitable for secondary molding and forming a secondary molded part on the workpiece; The core block includes a central axis core block and an outer layer axis core block arranged coaxially, and the core block adjustment mechanism is suitable for driving the central axis core block and the outer layer axis core block to enter the mold cavity and cooperate with the inner wall of the mold cavity to form the primary rotation shaft portion on the workpiece, wherein the central axis core block is sleeved on the inner side of the primary rotation shaft portion and is suitable for forming the rotation shaft hole on the primary rotation shaft portion, and the outer layer axis core block is sleeved on the outer side of the primary rotation shaft portion and is suitable for forming the outer wall of the primary rotation shaft portion; then the core block adjustment mechanism drives the central axis core block and / or the outer layer axis core block to partially exit the mold cavity, and makes the inner wall of the mold cavity cooperate with the outer wall of the primary rotation shaft portion and form the secondary rotation shaft portion on the workpiece; The core block adjustment mechanism includes a core pulling mechanism and an outer core block adjustment mechanism, the outer core block adjustment mechanism is relatively arranged on the fixed mold and the movable mold, the outer layer shaft core block includes a first outer layer shaft core block and a second outer layer shaft core block, the first outer layer shaft core block and the second outer layer shaft core block are respectively relatively arranged on the fixed mold and the movable mold; when the one-time molding is performed, the core pulling mechanism is suitable for driving the central shaft core block into the mold cavity along the axial direction of the workpiece, and the outer layer core block adjustment mechanism is suitable for driving the first outer layer shaft core block and the second outer layer shaft core block into the mold cavity, and making the first outer layer shaft core The top of the block contacts the top of the second outer layer shaft core block, and at this time a primary rotation shaft cavity is defined between the head of the first outer layer shaft core block and the head of the second outer layer shaft core block, and the primary rotation shaft cavity is suitable for cooperating with the central shaft core block and forming the primary rotation shaft portion; when the secondary molding is performed, the outer layer core block adjustment mechanism is suitable for adjusting the positions of the first outer layer shaft core block and the second outer layer shaft core block, and is suitable for forming a secondary rotation shaft cavity through the head of the outer layer shaft core block, the outer wall of the primary rotation shaft portion and the inner wall of the cavity, and the secondary rotation shaft cavity is suitable for molding the secondary rotation shaft portion; The fixed mold and the movable mold are respectively provided with sliding grooves matching the first outer layer shaft core block and the second outer layer shaft core block in the up and down directions, the first outer layer shaft core block and the second outer layer shaft core block are slidably installed in the sliding grooves, and the outer layer core block adjustment mechanism includes a translation core adjustment component relatively provided on the fixed mold and the movable mold, and the translation core adjustment component is suitable for driving the first outer layer shaft core block and the second outer layer shaft core block to slide in the sliding grooves respectively; The outer core block adjustment mechanism includes a rotary core adjustment component relatively arranged on the fixed mold and the movable mold, and a fixed plate is rotatably arranged on the rotary core adjustment component, and the rotary core adjustment component is suitable for driving the fixed plate to rotate forward or reverse; the outer layer shaft core block includes a first outer layer shaft core block, a second outer layer shaft core block, a third outer layer shaft core block and a fourth outer layer shaft core block, the first outer layer shaft core block and the third outer layer shaft core block are fixedly arranged on the fixed plate on the fixed mold, the second outer layer shaft core block and the fourth outer layer shaft core block are fixedly arranged on the fixed plate on the movable mold, and the fixed mold and the movable mold are respectively provided with movable grooves for the outer layer shaft core blocks to move. When the one-time molding is performed, the The rotary core-aligning assembly drives the fixed plate to rotate forward, so that the third outer layer shaft core block and the fourth outer layer shaft core block exit the mold cavity, and the first outer layer shaft core block and the second outer layer shaft core block enter the mold cavity, and the heads of the first outer layer shaft core block and the second outer layer shaft core block are relatively arranged and define the first rotation shaft mold cavity; when the secondary molding is performed, the rotary core-aligning assembly drives the fixed plate to rotate reversely, and the first outer layer shaft core block and the second outer layer shaft core block exit the mold cavity, and the third outer layer shaft core block and the fourth outer layer shaft core block enter the mold cavity, and the heads of the third outer layer shaft core block and the fourth outer layer shaft core block are relatively arranged and define the secondary rotation shaft mold cavity.

2. A two-color mold according to claim 1, characterized in that: A core mold template and a fixed template are relatively arranged on the fixed mold and the movable mold, and the cavity is defined between the relatively arranged core mold templates. The fixed template is arranged on the outside of the core mold template and is suitable for fixing the fixed mold and the injection molding machine and the movable mold and the injection molding machine respectively. The core mold template and the fixed template are slidably connected, and the rotary core adjustment component is fixedly installed on the fixed template. When the mold is opened, the core mold template is separated from the fixed template, and the outer shaft core block gradually disengages from the movable groove. The rotary core adjustment component is suitable for driving the fixed plate to rotate forward or reverse; when the mold is closed, the outer shaft core block gradually invades the movable groove, and the core mold template gradually conflicts with the fixed template.

3. A two-color mold according to claim 2, characterized in that: A reinforcing template is provided on the inner side of the fixed template, and a makeshift groove is provided on the reinforcing template for the installation and movement of the rotary core adjustment component and the outer shaft core block. When the mold is opened, the core mold template is separated from the reinforcing template, and the outer shaft core block gradually breaks away from the movable groove. When the mold is closed, the outer shaft core block gradually invades the movable groove, and the inner side of the reinforcing template gradually contacts the outer side of the core mold template. The reinforcing template is suitable for controlling the clamping force applied to the core mold template.

4. A two-color mold according to claim 2, characterized in that: A spring is installed between the fixed template and the core template, one end of the spring abuts the outer side of the core template, and the other end of the spring abuts the inner side of the fixed template. When the mold is closed, the spring is compressed and elastically deformed under the action of the clamping force; when the mold is opened, the spring restores the elastic deformation and drives the core template to move inward, thereby separating the core template from the fixed template.

5. A two-color mold according to claim 4, characterized in that: The movable groove includes a translation groove, which is respectively arranged on the fixed mold and the movable mold in the up and down directions. When the mold is opened, the spring restores the elastic deformation and drives the mold core template to move inward, thereby causing the outer layer shaft core block to move outward along the translation groove; when the mold is closed, the outer layer shaft core block gradually invades the translation groove and moves inward along the translation groove, and the spring is compressed under the action of the clamping force.

6. A two-color mold according to claim 5, characterized in that: The movable groove includes a rotation groove, which is arranged oppositely on the fixed mold and the movable mold. The outer layer shaft core block is suitable for rotating in the rotation groove. When the first molding is performed, the rotation core adjustment component is suitable for driving the outer layer shaft core block to rotate in the rotation groove, and making the first outer layer shaft core block and the second outer layer shaft core block relatively arranged; when the second molding is performed, the rotation core adjustment component is suitable for driving the outer layer shaft core block to rotate in the rotation groove, and making the third outer layer shaft core block and the fourth outer layer shaft core block relatively arranged.

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