Two-color injection mold

Abstract

This disclosure provides a two-color injection mold, comprising a first front mold, a second front mold, and a rear mold, the rear mold being sequentially engaged with the first and second front molds. The rear mold includes a rear mold base, a rear mold core, an ejection mechanism, and a lifting mechanism. The lifting mechanism includes a slider, a base, and several lifting blocks. One end of the slider has a recessed groove, and the base has an inclined groove. The end of the slider away from the recessed groove slides along the inclined groove. Several lifting blocks are installed on the top of the base and slidably connected to the rear mold core. When the first front mold and the rear mold are engaged, the first inclined ejector block is located within the recessed groove, and the lifting blocks are flush with the cavity. When the second front mold and the rear mold are engaged, the second inclined ejector block is located within the recessed groove, and the slider moves in the slider direction, causing the base to slide upwards, thereby lifting the first injection molded part. The first injection molded part is clamped between the lifting blocks and the front mold, enhancing the bonding force between the two materials.

Description

Technical Field

[0001] This disclosure relates to the technical field of injection molding, and in particular to a two-color injection mold. Background Technology

[0002] As a representative of lightweight modern wearable devices, the back shell design of smart bracelets directly affects product performance and user experience. Currently, smart bracelet back shells on the market are typically manufactured using injection molding to meet the demands of lightweight design, durability, and complex structures. Some products employ a composite design combining a non-transparent main frame with a transparent optical window to achieve better optical sensing performance.

[0003] However, in actual production, it was found that due to the differences between different materials and the limitations of mold structure design, the bonding force between the two materials was insufficient, resulting in defects such as cracking, delamination or peeling in subsequent processes and use, which seriously affected the reliability and service life of the product. Utility Model Content

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a two-color injection mold that can improve the bonding force between two different materials.

[0005] The purpose of this disclosure is achieved through the following technical solution:

[0006] A two-color injection mold includes: a first front mold, a second front mold, and a rear mold, wherein the rear mold is used to sequentially engage with the first front mold and the second front mold;

[0007] The rear mold includes a rear mold frame, a rear mold core, an ejection mechanism, and a lifting mechanism. The rear mold core and the lifting mechanism are both placed inside the rear mold frame. The ejection mechanism is slidably disposed inside the rear mold frame. The lifting mechanism includes a slider, a base, and several lifting blocks. One end of the slider has a clearance groove. The base is movably connected to the rear mold core. The base has an inclined groove. The end of the slider away from the clearance groove slides along the inclined groove. Several lifting blocks are installed on the top of the base and are slidably connected to the rear mold core.

[0008] The first front mold includes a first mold frame, a first mold core, and a first inclined ejector block. The first mold core is fixedly disposed on the first mold frame. One end of the first inclined ejector block is disposed inside the first mold core. When the first front mold is engaged with the rear mold, part of the slider is located in the inclined groove, and the first inclined ejector block is located in the clearance groove of the slider. The first mold core and the rear mold core together form a first cavity. The first cavity is used for injection molding to form a first injection molded part. Each of the lifting blocks is flush with the side of the rear mold core facing the first mold core.

[0009] The second front mold includes a second mold frame, a second mold core, and a second inclined ejector block. The second mold core is fixedly mounted on the second mold frame. One end of the second inclined ejector block is located inside the second mold core. When the second front mold is engaged with the rear mold, the second inclined ejector block is located in the clearance groove of the slider. The second mold core and the rear mold core together form a second cavity. Each lifting block protrudes from the rear mold core. The slider slides against the groove wall of the inclined groove so that the lifting blocks are used to lift the first injection molded part.

[0010] In one embodiment, the slider is further provided with a limiting groove, the limiting groove being connected to the avoidance groove, and the first inclined top block forming a limiting block, the limiting block being used to insert into the limiting groove when the first front mold is engaged with the rear mold.

[0011] In one embodiment, the base has a mounting groove at the top and the lifting block has a mounting protrusion at the bottom, which engages with the mounting groove.

[0012] In one embodiment, the base has a mounting groove at the top and the lifting block has a mounting protrusion at the bottom, which engages with the mounting groove.

[0013] In one embodiment, the rear mold further includes an insert, one end of which is connected to the ejection mechanism, and the other end of which is slidably connected to the rear mold core.

[0014] In one embodiment, guide grooves are provided on both sides of the base, the insert slides along the guide grooves, and a stop protrusion is provided on the side wall of the guide groove. The stop protrusion is used to abut against the ejector rod of the ejection mechanism during demolding.

[0015] In one embodiment, the lifting mechanism further includes a mounting plate with a groove and a through hole. The slider and the base are disposed in the groove, and the ejector pin of the ejection mechanism passes through the mounting plate to form a cavity.

[0016] In one embodiment, the first front mold further includes a molding block disposed within the first mold core. The molding block, the first mold core, and the rear mold core together form a first cavity, and the molding block has at least two molding cavities.

[0017] In one embodiment, the molding block further includes a plurality of molding inserts, the molding block has a plurality of through holes, each of the through holes is connected to the corresponding molding cavity, and each of the molding inserts is disposed in the corresponding through hole.

[0018] In one embodiment, the lifting mechanism further includes a wear-resistant block, which is fixedly connected to the rear mold core.

[0019] In one embodiment, the lifting block further includes a plurality of fixing posts arranged along the periphery of the end face of the lifting block.

[0020] In one embodiment, the second front mold further includes a plurality of abutment blocks, the plurality of abutment blocks being disposed on the second mold core, the plurality of second mold cores, the second mold core and the rear mold core together forming the second cavity, and when the second front mold is engaged with the rear mold, the abutment blocks abut against the first injection molded part.

[0021] Compared with the prior art, this disclosure has at least the following advantages:

[0022] 1. The above-mentioned two-color injection mold forms two sets of molds by using two different front molds and sequentially engaging with the rear mold. By cooperating with the first and second inclined ejector blocks and the slider, the relative position of the lifting blocks is changed, thereby realizing the molding and lifting of the first injection molded part. During the second injection, the first injection molded part is higher than the rear mold core, and the secondary injection material clamps and covers the first plastic part, improving the bonding force between the two materials and extending the service life of the final product.

[0023] 2. The horizontal movement of the slider is converted into the vertical movement of the lifting block by the base, simplifying the overall structure of the lifting mechanism, reducing its size, and making the mold structure more compact. The simple structure of the lifting mechanism also facilitates maintenance. Furthermore, the modular design allows for individual component replacement, extending the service life of the two-color injection mold. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a two-color injection mold according to an embodiment;

[0026] Figure 2 for Figure 1 The diagram shows the structure of the first front mold of the two-color injection mold.

[0027] Figure 3 for Figure 1 The diagram shows the structure of the second front mold of the two-color injection mold;

[0028] Figure 4for Figure 1 The diagram shows the structure of the rear mold of the two-color injection mold.

[0029] Figure 5 for Figure 4 A schematic diagram of the lifting mechanism of the rear mold shown;

[0030] Figure 6 for Figure 5 A schematic diagram of the slider of the lifting mechanism shown;

[0031] Figure 7 for Figure 5 A schematic diagram of the base of the lifting mechanism shown;

[0032] Figure 8 for Figure 2 The diagram shows the structure of the molding block of the first front mold. Detailed Implementation

[0033] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0037] Please see Figures 1 to 8The two-color injection mold 10 of this utility model includes a first front mold 100, a second front mold 200 and a rear mold 300, and the rear mold 300 is used to engage with the first front mold 100 and the second front mold 200 in sequence. The rear mold 300 includes a rear mold frame 310, a rear mold core 320, an ejection mechanism 330, and a lifting mechanism 340. The rear mold core 320 and the lifting mechanism 340 are both disposed within the rear mold frame 310. The ejection mechanism 330 is slidably disposed within the rear mold frame 310. The lifting mechanism 340 includes a slider 341, a base 342, and several lifting blocks 343. One end of the slider 341 is provided with a clearance groove 3411. The base 342 is movably connected to the rear mold core 320. The base 342 is provided with a sloping groove 3422. The end of the slider 341 away from the clearance groove 3411 slides along the sloping groove 3422. Several lifting blocks 343 are disposed on the top of the base 342 and are slidably connected to the rear mold core 320. The first front mold 100 includes a first mold base 110, a first mold core 120, and a first inclined ejector block 130. The first mold core 120 is fixedly mounted on the first mold base 110. One end of the first inclined ejector block 130 is located inside the first mold core 120. When the first front mold 100 and the rear mold 300 are engaged, part of the slider 341 is located in the inclined groove 3422, and the first inclined ejector block 130 is located in the clearance groove 3411 of the slider 341. The first mold core 120 and the rear mold core 320 together form a first cavity (not shown in the figure). The first cavity is used for injection molding to form a first injection molded part. Each lifting block 343 is flush with the side of the rear mold core 320 facing the first mold core 120. The second front mold 200 includes a second mold base 210, a second mold core 220, and a second inclined ejector block 230. The second mold core 220 is fixedly mounted on the second mold base 210. One end of the second inclined ejector block 230 is located inside the second mold core 220. When the second front mold 200 is engaged with the rear mold 300, the second inclined ejector block 230 is located in the clearance groove 3411 of the slider 341. The second mold core 220 and the ejection mechanism 330 together form a second cavity (not shown in the figure). The second cavity is used for injection molding to form a second injection molded part. Each lifting block 343 protrudes from the rear mold core 320. The second inclined ejector block 230 slides against the groove wall of the inclined groove 3422 so that the lifting blocks 343 lift the first injection molded part (not shown in the figure).

[0038] Specifically, when the first front mold 100 and the rear mold 300 are engaged, the first inclined ejector block 130 is located in the clearance groove 3411 of the slider 341, and part of the slider 341 is located in the inclined groove 3422. The lifting block 343, the first mold core 120, and the rear mold core 320 together form the first cavity. After the first injection molded part is formed, the first front mold 100 and the rear mold 300 are separated. The first inclined ejector block 130 is pulled out of the clearance groove 3411, and the slider 341 is reset. Then, the second front mold 200 and the rear mold 300 are engaged, the second inclined ejector block 230 is located in the relief groove 3411 of the slider 341, the slider 341 moves towards the base 342, and one end of the slider 341 slides along the inclined groove 3411 so that the lifting block 343 slides relative to the rear mold core 320 towards the second cavity, thereby lifting the first injection molded part. The second mold core 220, the lifting block 343 and the rear mold core 320 together form the second cavity. The first injection molded part is higher than the rear mold core 320, so that the secondary injection material clamps the first injection molded part to form.

[0039] It should be noted that the material of the first injection molded part is different from that of the second injection molded part.

[0040] Understandably, the two-color injection mold 10 forms two sets of molds by sequentially engaging two different front molds with the rear mold 300. Through the cooperation of the first inclined ejector block 130 and the second inclined ejector block 230 with the lifting mechanism 340, the relative position of the lifting block 343 is changed, thereby achieving the molding and lifting of the first injection molded part. During the second injection, the first injection molded part is higher than the rear mold core 320, and the secondary injection material clamps and molds the first plastic part, improving the bonding force between the two materials and extending the product's service life. Furthermore, the base 342 converts the horizontal movement of the slider 341 into the vertical movement of the lifting block, simplifying the overall structure of the lifting mechanism 300, reducing its size, and making the structure of the two-color injection mold 10 more compact. The lifting mechanism 340 also has a simple structure and is easy to maintain. Simultaneously, the modular design facilitates the replacement of individual components, extending the service life of the two-color injection mold 10.

[0041] like Figure 2 and Figure 6As shown, in one embodiment, the slider 341 also has a limiting groove 3412, which communicates with the avoidance groove 3411. The first inclined ejector block 130 forms a limiting protrusion 131, which is used to engage with the limiting groove 3412 when the first front mold 100 is engaged with the rear mold 300. In this embodiment, the limiting protrusion 131 and the limiting groove 3412 are inclined, and the limiting groove 3412 is a T-shaped groove. The limiting protrusion 131 and the limiting groove 3412 are adapted to each other to prevent the slider 341 from shifting during injection molding, thereby preventing the lifting block 343 from moving and ensuring the molding accuracy and quality of the first injection molded part. At the same time, the inclined limiting groove 3412 has a guiding function, reducing the positional deviation of the slider 341. Furthermore, the limiting protrusion 131 and the first inclined ejector block 130 are integrally formed to ensure that the movement of the limiting protrusion 131 and the first inclined ejector block 130 is synchronized, improving the stability and safety of the mold.

[0042] like Figure 5 and Figure 7 As shown, in one embodiment, the base 342 has a mounting groove 3421 on its top, and the lifting block 343 has a mounting protrusion 3431 on its bottom, which engages with the mounting groove 3421. It is understood that this engaging connection between the mounting protrusion 3431 and the mounting groove 3421 improves assembly efficiency and facilitates replacement and adjustment.

[0043] like Figure 4 As shown, in one embodiment, the rear mold 300 further includes an insert 350. One end of the insert 350 is connected to the ejection mechanism 330, and the other end of the insert 350 is slidably connected to the rear mold core 320. One end of the insert 350 is inclined toward the base 342. During the demolding process, the ejector pin ejects axially, causing the insert 350 to separate from the product, thereby realizing the product demolding and ejection action and avoiding product deformation or damage during the ejection process.

[0044] like Figure 4 and Figure 7 As shown, in one embodiment, guide grooves 3423 are formed on both sides of the base 342. The insert 350 slides along the guide grooves 3423. The sidewall of the guide groove 3423 is provided with a stop protrusion 3424, which is used to abut against the ejector rod of the ejection mechanism 330 during demolding. Specifically, in this embodiment, two inserts 350 are symmetrically arranged on both sides of the base 342. The guide grooves 3423 provide support for the inserts 350, preventing the inserts 350 from shifting and ensuring molding accuracy and stability.

[0045] like Figure 5As shown, in one embodiment, the lifting mechanism 340 further includes a mounting plate 344, which is mounted on the rear mold core 320. The mounting plate 344 has a groove 3441 and a through hole 3442. The slider 341 and the base 342 are disposed in the groove 3441, and the ejector pin of the ejection mechanism 330 passes through the mounting plate 344 to form the cavity. It can be understood that the slider 341 slides in the groove 3441, avoiding direct contact with the mold body, reducing wear, and extending service life. At the same time, the mounting plate 344 is an independent component, which can be replaced separately after wear, without scrapping the entire mold, thus reducing maintenance costs.

[0046] like Figure 2 and Figure 8 As shown, in one embodiment, the first front mold 100 further includes a molding block 140, which is disposed within the first mold core 120. The molding block 140, the first mold core 120, and the rear mold core 320 together form a first cavity. The molding block 140 has at least two molding cavities 141, which are used to mold the first injection molded part. The shape of the molding cavity 141 is adapted to the shape of the corresponding position of the first injection molded part. It can be understood that opening molding cavities 141 on the molding block 140 can reduce the overall processing difficulty of the mold and improve the precision of the molding cavity, thereby improving the molding precision of the product. At the same time, the modular design facilitates maintenance and replacement.

[0047] like Figure 2 and Figure 8 As shown, in one embodiment, the molding block 140 further includes a plurality of cavity inserts 142. The molding block 140 has a plurality of through holes 1401, each through hole 1401 communicating with a corresponding molding cavity 141, and each cavity insert 142 located within a corresponding through hole 1401. It can be understood that the top of each independent cavity is the end face of a cavity insert 142, improving the surface accuracy of the first injection molded part.

[0048] like Figures 3 to 5 As shown, in one embodiment, the lifting mechanism 340 further includes a wear-resistant block 345, which is fixedly connected to the rear mold core 320. It is understood that the wear-resistant block 345 is located in the movement direction of the slider 341, separating the slider 341 from the front mold core, preventing direct contact between the slider 341 and the front mold core, reducing wear, and extending service life. Simultaneously, as an independent component, the wear-resistant block 345 can be replaced individually after wear, without scrapping the entire mold, reducing maintenance costs. Furthermore, the wear-resistant block 345 abuts against both the front mold and the slider 341, preventing the slider 341 from lifting during mold closing and preventing mold damage.

[0049] like Figure 5As shown, in one embodiment, the lifting block 343 further includes a plurality of fixing posts 3432. The plurality of fixing posts 3432 are arranged along the periphery of the end face of the lifting block 343. It can be understood that the fixing posts 3432 are arranged at the periphery of the end face of the lifting block 343 and are located on the back side. Without affecting the function of the first injection molded part, the first injection molded part is further fixed on the lifting block 343 to prevent the first injection molded part from shifting and to improve the molding accuracy of the product.

[0050] like Figure 3 As shown, in one embodiment, the second front mold 200 further includes a plurality of abutment blocks 240, which are disposed on the second mold core 220. The plurality of abutment blocks 240, the second mold core 220, and the rear mold core 320 together form a second cavity. When the second front mold 200 and the rear mold are engaged, the abutment blocks 240 abut against the first injection molded part. It can be understood that when the second front mold 200 and the rear mold are engaged, the abutment blocks 240 cooperate with the fixing posts 3432 to clamp and fix the first injection molded part in the second cavity, further fixing the first injection molded part, preventing it from shifting, and improving the product molding accuracy. Furthermore, the end face of the abutment block 240 abuts against the functional surface of the first injection molded part, preventing contamination of the functional surface of the first injection molded part during the secondary injection molding process, thus avoiding scrapping.

[0051] Compared with the prior art, this disclosure has at least the following advantages:

[0052] 1. The above-mentioned two-color injection mold forms two sets of molds by using two different front molds and sequentially engaging with the rear mold. By cooperating with the first and second inclined ejector blocks and the slider, the relative position of the lifting blocks is changed, thereby realizing the molding and lifting of the first injection molded part. During the second injection, the first injection molded part is higher than the rear mold core, and the secondary injection material clamps and covers the first plastic part, improving the bonding force between the two materials and extending the service life of the final product.

[0053] 2. The horizontal movement of the slider is converted into the vertical movement of the lifting block by the base, simplifying the overall structure of the lifting mechanism, reducing its size, and making the mold structure more compact. The simple structure of the lifting mechanism also facilitates maintenance. Furthermore, the modular design allows for individual component replacement, extending the service life of the two-color injection mold.

[0054] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A two-color injection mold, comprising: A first front mold, a second front mold, and a rear mold, wherein the rear mold is used to sequentially engage with the first front mold and the second front mold, characterized in that... The rear mold includes a rear mold frame, a rear mold core, an ejection mechanism, and a lifting mechanism. The rear mold core and the lifting mechanism are both disposed within the rear mold frame. The ejection mechanism is slidably disposed within the rear mold frame. The lifting mechanism includes a slider, a base, and several lifting blocks. One end of the slider has a clearance groove. The base is movably connected to the rear mold core. The base has an inclined groove. The end of the slider away from the clearance groove slides along the inclined groove. Several lifting blocks are installed on the top of the base and are slidably connected to the rear mold core. The first front mold includes a first mold frame, a first mold core, and a first inclined ejector block. The first mold core is fixedly disposed on the first mold frame. One end of the first inclined ejector block is disposed inside the first mold core. When the first front mold is engaged with the rear mold, part of the slider is located in the inclined groove, and the first inclined ejector block is located in the clearance groove of the slider. The first mold core and the rear mold core together form a first cavity. The first cavity is used for injection molding to form a first injection molded part. Each of the lifting blocks is flush with the side of the rear mold core facing the first mold core. The second front mold includes a second mold frame, a second mold core, and a second inclined ejector block. The second mold core is fixedly mounted on the second mold frame. One end of the second inclined ejector block is located inside the second mold core. When the second front mold is engaged with the rear mold, the second inclined ejector block is located in the clearance groove of the slider. The second mold core and the rear mold core together form a second cavity. Each lifting block protrudes from the rear mold core. The slider slides against the groove wall of the inclined groove to lift the first injection molded part.

2. The two-color injection mold of claim 1, wherein The slider also has a limiting groove, which is connected to the avoidance groove. The first inclined top block forms a limiting block, which is used to insert into the limiting groove when the first front mold is engaged with the rear mold.

3. The two-color injection mold of claim 1, wherein, The base has a mounting groove at the top, and the lifting block has a mounting protrusion at the bottom, which engages with the mounting groove.

4. The two-color injection mold of claim 1, wherein The rear mold also includes an insert, one end of which is connected to the ejection mechanism, and the other end of which is slidably connected to the rear mold core.

5. The two-color injection mold of claim 4, wherein, Guide grooves are provided on both sides of the base, the insert slides along the guide grooves, and a stop protrusion is provided on the side wall of the guide groove. The stop protrusion is used to abut against the ejector rod of the ejection mechanism during demolding.

6. The two-color injection mold of claim 1, wherein, The lifting mechanism also includes a mounting plate, which has a groove and a through hole. The slider and the base are disposed in the groove, and the ejector pin of the ejection mechanism passes through the mounting plate to form a cavity.

7. The two-color injection mold according to claim 1, characterized in that, The first front mold also includes a molding block, which is disposed inside the first mold core. The molding block, the first mold core, and the rear mold core together form a first cavity, and the molding block has at least two molding cavities.

8. The two-color injection mold of claim 7, wherein, The molding block further includes several molding inserts. The molding block has several through holes, each of which is connected to the corresponding molding cavity, and each molding insert is disposed in the corresponding through hole.

9. The two-color injection mold of claim 1, wherein, The lifting mechanism also includes a wear-resistant block, which is fixedly connected to the rear mold core.

10. The two-color injection mold of claim 1, wherein, The lifting block further includes a plurality of fixing posts, which are arranged along the periphery of the end face of the lifting block; and / or, the second front mold further includes a plurality of abutting blocks, which are arranged on the second mold core, and the plurality of second mold cores, the second mold core and the rear mold core together form the second cavity. When the second front mold is engaged with the rear mold, the abutting blocks abut against the first injection molded part.

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