Combined keycap injection mold core

Abstract

A combined keycap injection mold core comprises an upper mold plate, a lower mold plate, a plurality of pairs of mold cores, a plurality of first insertion blocks and at least one second insertion block, the bottom face of each upper mold core is provided with a forming boss, the top face of each lower mold core is provided with a forming cavity, each upper mold core is provided with a plurality of accessory forming holes, the upper mold cores are detachably assembled on the upper mold plate, and the first insertion blocks and the second insertion blocks are detachably assembled on the upper mold plate. The multiple lower mold cores are detachably assembled on the lower mold plate, the bottom face of each first insertion block is provided with a corresponding accessory forming boss, the bottom of each second insertion block is provided with a forming runner, each first insertion block is inserted into the corresponding accessory forming hole of the upper mold core to form an accessory forming cavity, and each second insertion block is inserted into the corresponding accessory forming hole of the upper mold core to form an accessory forming cavity. And the upper mold plate and the lower mold plate are closed, so that keycap forming cavities are formed in spaces between the forming bosses and the forming concave cavities and are communicated with the accessory forming cavities. The keycap forming mold is simple in structure, the mold core is convenient to replace, keycaps of one or more specifications can be formed in the same batch according to needs, and the product quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of injection molding, and in particular to a combined key cap injection mold core. Background Art

[0002] A keyboard has a variety of keycap structures of different specifications, such as large-size keycaps, medium-size keycaps, and small-size keycaps, respectively. Figure 1 , Figure 2 , Figure 3 When enterprises use injection molds to produce keyboard products, they need to design different mold cores for keycaps of different specifications, and assemble the mold cores between the upper and lower mold plates for injection molding. The keycap products obtained are then combined to form a set of keyboards.

[0003] Different batches of processed keycaps are affected by factors such as different raw material batches and injection temperature fluctuations, which will lead to color differences in keycaps of different batches and specifications. The assembled keyboards have poor consistency and cannot effectively meet the high standards of customers. In addition, the large number of designed molds also increases the processing cost of the keyboard, which is not conducive to improving the competitiveness of the company.

[0004] Therefore, how to design a universal injection mold core suitable for multiple specifications and capable of ensuring injection molding quality is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a combined keycap injection mold core with a simple structure and convenient mold core replacement, and keycaps of one or more specifications can be molded in the same batch according to needs to ensure product quality.

[0006] The technical solution of the present invention is: a combined keycap injection mold core, including an upper mold plate, a lower mold plate, and also including multiple pairs of mold cores, a plurality of first plug-in blocks, and at least one second plug-in block, each pair of mold cores includes an upper mold core and a lower mold core, and the bottom surface of each upper mold core is provided with a molding boss of the same or different specifications, and the top surface of the lower mold core is provided with a corresponding molding cavity, each upper mold core is provided with a plurality of accessory molding holes, which are connected with the molding boss, and the plurality of upper mold cores are detachably assembled on the upper mold plate, and the bottom surfaces are flush, and the plurality of lower mold cores are detachably assembled on the lower mold plate, and the top surfaces are flush, and the bottom surface of each first plug-in block is provided with Corresponding to the accessory molding boss, a molding flow channel is provided at the bottom of the second plug-in block, each first plug-in block is inserted into the accessory molding hole corresponding to the upper mold core and positioned, the space between the accessory molding boss and the accessory molding hole of each first plug-in block forms an accessory molding cavity, the second plug-in block is inserted into the accessory molding hole corresponding to the upper mold core and positioned, the inlet of the molding flow channel of the second plug-in block is connected with the mold flow channel, and the outlet of the molding flow channel is located on the side wall of the molding boss, the upper mold plate and the lower mold plate are molded together, so that the space between the molding boss of each pair of mold cores and the molding cavity of the lower mold core forms a keycap molding cavity, and is connected with the accessory molding cavity.

[0007] The bottom surface of the upper mold plate and the upper mold core, the top surface of the lower mold plate and the lower mold core are all provided with flow channel giving way grooves for giving way to the mold flow channel.

[0008] The forming flow channel is in an upwardly curved arc shape, and the inlet cross-sectional area of ​​the forming flow channel is larger than the outlet cross-sectional area of ​​the forming flow channel.

[0009] There are multiple second plug blocks, which are combined to be integrally plugged into the corresponding accessory forming holes. Open grooves are provided on the side walls of two adjacent second plug blocks, and a forming flow channel is formed by the combination of the two open grooves.

[0010] The bottom surface of the second plug block is a two-level stepped surface, and the step height of the two-level stepped surface is adapted to the height of the forming boss. The inlet of the forming flow channel is located on the first tread of the second plug block step surface, and the outlet of the forming flow channel is located on the riser of the step surface.

[0011] The top surface of each lower mold core is provided with an exhaust channel surrounding the corresponding molding cavity.

[0012] The top of the second plug block is provided with a positioning flange, and the upper end opening of the accessory forming hole corresponding to the second plug block is provided with a positioning step. The second plug block is inserted into the corresponding accessory forming hole, and is positioned by the cooperation of the positioning flange and the positioning step.

[0013] It also includes a plurality of connecting rods, the lower end side walls of the connecting rods are provided with positioning ring grooves, the top ends of a plurality of first plug blocks are provided with positioning bosses, the upper ends of the connecting rods are connected to the mold frame, each of the first plug blocks is inserted into the corresponding accessory forming hole, and the positioning is formed by the positioning boss cooperating with the positioning ring groove of the connecting rod.

[0014] The above technical solution has the following beneficial effects:

[0015] 1. The combined keycap injection mold core includes an upper mold plate and a lower mold plate. The upper mold plate and the lower mold plate are used to assemble the mold core and drive the mold core to move. It also includes multiple pairs of mold cores, a number of first plug-ins, and at least one second plug-in block. The mold core is used to provide an injection cavity, and different mold cores provide different injection cavities for injection molding to obtain keycaps of different specifications. The first plug-in block and the second plug-in block are used to cooperate with the injection cavity to obtain keycaps with specific structures by injection molding. Each pair of mold cores includes an upper mold core and a lower mold core, and the bottom surface of each upper mold core is provided with a molding boss of the same or different specifications, and the top surface of the lower mold core is provided with a corresponding molding cavity. By cooperating with the molding boss and the molding cavity, an injection cavity with specific specifications is obtained. Each upper mold core is provided with a plurality of accessory molding holes, which are connected to the molding boss, that is, the accessory molding hole is connected to the molding cavity. The plurality of upper mold cores are detachably assembled on the upper mold plate, and the bottom surfaces are flush. The plurality of lower mold cores are detachably assembled on the lower mold plate, and the top surfaces are flush. The upper mold cores and the lower mold cores can be replaced as needed to meet the needs of producing keycaps of the same specification or different specifications in the same batch, and ensure the consistency of the produced keycaps. The bottom surface of each first plug-in block is provided with a corresponding accessory molding boss, and the bottom of the second plug-in block is provided with a molding flow channel. Each first plug-in block is plugged into the accessory molding hole corresponding to the upper mold core and positioned. The space between the accessory molding boss and the accessory molding hole of each first plug-in block forms an accessory molding cavity. By selecting different first plug-ins, different accessory molding cavities are formed in cooperation with the accessory molding holes, and correspondingly different keycap accessory structures are obtained. Of course, a first plug-in block with a flat bottom surface can also be selected to close the accessory molding hole, thereby serving as the cavity wall of the molding cavity. The second plug-in block is inserted into the accessory forming hole corresponding to the upper mold core and positioned. The inlet of the forming flow channel of the second plug-in block is connected with the mold flow channel, and the outlet of the forming flow channel is located on the side wall of the forming boss. The upper mold plate and the lower mold plate are molded together so that the space between the forming boss of each pair of mold cores and the forming cavity of the lower mold core forms a keycap forming cavity, and is connected with the accessory forming cavity to form a plurality of mutually independent and closed forming cavities (corresponding to the number of mold cores), which can realize the molding of multiple keycap products of the same or different specifications in the same batch and ensure the consistency of the keycap products in this batch. In addition, the mold flow channel provides high-pressure injection liquid to the molding cavity through the molding flow channel at the bottom of the second plug-in block. After the product is molded and opened, the flow channel and the molded product are automatically separated, which also reduces the difficulty of demolding the keycap, omits the deburring process, and further reduces the production cost of the keycap. The number of second plug-ins can be adjusted according to the size of the molded product, and then the number of molding flow channels connected to the molding cavity can be adjusted to avoid the occurrence of cavities and ensure product quality.

[0016] 2. The molding runner is in an upward curved arc shape, and the inlet cross-sectional area of ​​the molding runner is larger than the outlet area of ​​the molding runner. The molding runner with this structure can increase the flow rate of the injection liquid entering the molding cavity, increase the filling speed of the molding cavity, and thus ensure the injection molding quality. In addition, it also makes the connection area between the molded keycap and the residual section in the molding runner small, which is also conducive to separation during the mold opening process.

[0017] 3. There are multiple second plug-in blocks, which are combined as a whole and plugged into the corresponding accessory forming holes. Open grooves are provided on the side walls of two adjacent second plug-in blocks, and a forming flow channel is formed by the combination of the two open grooves. The process of machining the open grooves on the side walls of the second plug-in blocks is simple, which reduces the machining cost.

[0018] 4. The positioning structures of the first plug-in block and the second plug-in block of the present invention are simple in structure and low in processing cost, which can effectively reduce the manufacturing cost of the mold core.

[0019] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of a large-size keycap;

[0021] Figure 2 It is a schematic diagram of the structure of a medium-sized keycap;

[0022] Figure 3 It is a schematic diagram of the structure of a small-sized keycap;

[0023] Figure 4 It is a structural schematic diagram of the present invention;

[0024] Figure 5 It is a schematic diagram of the top surface matching of the upper mold plate and the upper mold core of the present invention (where the upper mold core in the lower left corner is removed from the matching first plug-in block and second plug-in block);

[0025] Figure 6 It is a schematic diagram of the bottom surface matching of the upper mold plate and the upper mold core of the present invention;

[0026] Figure 7 for Figure 6 Enlarged view of the M in the middle;

[0027] Figure 8 It is a schematic diagram of the top surface matching of the lower mold plate and the lower mold core of the present invention;

[0028] Fig. 9 It is a schematic diagram of the cooperation between the connecting rod and the first plug block of the present invention;

[0029] Fig.10 It is a schematic structural diagram of the second plug-in block of the present invention.

[0030] In the accompanying drawings, 1 is an upper mold plate, 2 is a lower mold plate, 3 is a mold core, 31 is an upper mold core, 311 is a molding boss, 312 is an accessory molding hole, 32 is a lower mold core, 321 is a molding cavity, 4 is a first plug block, 41 is an accessory molding boss, 42 is a positioning boss, 5 is a second plug block, 51 is a molding flow channel, 52 is a positioning flange, 6 is an accessory molding cavity, 7 is a keycap molding cavity, 8 is a flow channel give way groove, 9 is an exhaust channel, 10 is a positioning step, 11 is a connecting rod, and 111 is a positioning ring groove. DETAILED DESCRIPTION

[0031] See also Figures 1 to 10, which is a specific embodiment of a modular keycap injection mold core. The modular keycap injection mold core includes an upper mold plate 1, a lower mold plate 2, and also includes multiple pairs of mold cores 3, a plurality of first plug-in blocks 4, and at least one second plug-in block 5. In this embodiment, the number of mold cores is four. In actual production, the number of mold cores is usually designed to be multiple. Each pair of mold cores 3 includes an upper mold core 31 and a lower mold core 32, and the bottom surface of each upper mold core 31 is provided with a molding boss 311 of the same or different specifications, and the top surface of the lower mold core 32 is provided with a corresponding molding cavity 321. In this embodiment, the molding bosses provided on the first upper mold core and the second upper mold core correspond to large-size keycaps, and only one molding boss of this type is provided on an upper mold core, the molding boss provided on the third upper mold core corresponds to medium-size keycaps, and two molding bosses of this type are provided on an upper mold core, the molding boss provided on the fourth upper mold core corresponds to small-size keycaps, and one molding boss of this type is provided on an upper mold core. Of course, for this type of small-size keycaps, four molding bosses of this type can also be provided on one upper mold core. Each upper mold core 31 is provided with a plurality of accessory forming holes 312, which are connected to the forming boss 311. The first upper mold core is provided with fourteen accessory forming holes, twelve of which are used to plug in the first plug-in block and two of which are used to plug in the second plug-in block. The second upper mold core is provided with sixteen accessory forming holes, fourteen of which are used to plug in the first plug-in block and two of which are used to plug in the second plug-in block. The third upper mold core is provided with twenty accessory forming holes, which are divided into two groups and correspond to one forming boss respectively, nine of which are used to plug in the first plug-in block and one of which is used to plug in the second plug-in block. The fourth upper mold core is provided with eight accessory forming blocks, seven of which are used to plug in the first plug-in block and one of which is used to plug in the second plug-in block. The four upper mold cores 31 are detachably assembled on the upper mold plate 1, and the bottom surfaces are flush, usually aligned by steps. The multiple lower mold cores 32 are detachably assembled on the lower mold plate 2, and the top surfaces are flush, usually aligned by steps. The bottom surface of each first plug-in block 4 is provided with a corresponding accessory forming boss 41, and the bottom of the second plug-in block 5 is provided with a forming flow channel 51. Each first plug-in block 4 is inserted into the accessory forming hole 312 corresponding to the upper mold core and positioned. In this embodiment, it also includes a plurality of connecting rods 11, and the lower end side wall of the connecting rod 11 is provided with a positioning ring groove 111. The top of a plurality of first plug-in blocks 4 is provided with a positioning boss 42. The upper end of the connecting rod 11 is connected to the mold frame. Each first plug-in block 4 is inserted into the corresponding accessory forming hole, and the positioning boss 42 cooperates with the positioning ring groove 111 of the connecting rod to form a positioning. The space between the accessory forming boss 41 of each first plug-in block 4 and the accessory forming hole 312 forms an accessory forming cavity 6, which is used to form accessories such as link holes, hooks, and slide grooves on the bottom surface of the keycap.The second plug-in block 5 is inserted into the accessory forming hole 312 corresponding to the upper mold core and positioned. In this embodiment, a positioning flange 52 is provided at the top of the second plug-in block 5, and a positioning step 10 is provided at the upper end opening of the accessory forming hole corresponding to the second plug-in block. The second plug-in block 5 is inserted into the corresponding accessory forming hole, and the positioning is formed by the positioning flange 52 and the positioning step 10. The bottom surface of the second plug-in block 5 is a secondary step surface, and the step height of the secondary step surface is adapted to the height of the forming boss. The inlet of the forming flow channel 51 is located on the first tread of the second plug-in block step surface, and the outlet of the forming flow channel 51 is located on the step surface. On the kick surface, in order to facilitate processing and reduce processing costs, the number of second plug-ins 5 is multiple, and multiple second plug-ins are combined as a whole and plugged into the corresponding accessory forming hole 312. An open groove is set on the side wall of two adjacent second plug-ins, and a forming flow channel is formed by the combination of two open grooves. In addition, the forming flow channel 51 is in an arc shape that bends upward, and the inlet cross-sectional area of ​​the forming flow channel 51 is larger than the outlet area of ​​the forming flow channel. In addition, the number of forming flow channels on a second plug-in block (a whole composed of multiple second plug-ins) is usually one or more, such as one, two or three, which is determined according to the size of the keycap. The inlet of the forming flow channel 51 of the second plug-in block 5 is connected to the mold flow channel, and the outlet of the forming flow channel is located on the side wall of the forming boss 311. Obviously, the bottom surface of the upper mold plate 1, the upper mold core 31, the lower mold plate 2, and the top surface of the lower mold core 32 are all provided with a flow channel clearance groove 8 that makes way for the mold flow channel. The upper mold plate 1 and the lower mold plate 2 are molded together, so that the space between the molding boss 311 of the upper mold core and the molding cavity 321 of the lower mold core of each pair of mold cores forms a keycap molding cavity 7, which is connected with the accessory molding cavity 6. In addition, in order to ensure smooth mold closing, the top surface of each lower mold core 32 is provided with an exhaust channel 9 surrounding the corresponding molding cavity 321.

[0032] The working principle of the present invention is as follows: the upper mold core and the lower mold core are respectively assembled in the upper mold plate and the lower mold plate, and the first plug block and the second plug block are assembled correspondingly, and the pressure plates are respectively installed on the top surface of the upper mold plate and the bottom surface of the lower mold plate to locate the positions of the upper mold core, the lower mold core and the second plug block, and the upper end of the connecting rod is connected to the mold frame to locate the position of the first plug block in the upper mold core. The high-temperature and high-pressure injection liquid enters the corresponding molding flow channel of the second plug block through the mold flow channel, and is injected into the connected cavity to form the keycap and the link hole, slide groove, and hook accessories on the back of the keycap. After the molding is completed, the upper mold plate moves upward to automatically separate the molded keycap from the residual section of the molding flow channel, and the molded keycap product can be taken out.

Claims

1. A modular keycap injection mold core, comprising an upper mold plate (1) and a lower mold plate (2), characterized in that: It also includes a plurality of pairs of mold cores (3), a plurality of first plug-in blocks (4), and at least one second plug-in block (5). Each pair of mold cores (3) comprises an upper mold core (31) and a lower mold core (32), and the bottom surface of each upper mold core (31) is provided with a molding boss (311) of the same or different specifications, and the top surface of the lower mold core (32) is provided with a corresponding molding cavity (321), and each upper mold core (31) is provided with a plurality of accessory molding holes (312) which are connected to the molding boss (311). The plurality of upper mold cores (31) are detachably mounted on the upper mold plate (1) with their bottom surfaces flush, and the plurality of lower mold cores (32) are detachably mounted on the lower mold plate (2) with their top surfaces flush. The bottom surface of each first plug-in block (4) is provided with a corresponding accessory molding boss (41), and the bottom of the second plug-in block (5) is provided with a molding flow channel (51). Each first plug-in block (4) is inserted into the accessory molding hole (312) corresponding to the upper mold core and positioned. The space between the accessory molding boss (41) and the accessory molding hole (312) of each first plug-in block (4) forms an accessory molding cavity (6). The second plug-in block (5) is inserted into the accessory molding hole (312) corresponding to the upper mold core and positioned. The inlet of the molding flow channel (51) of the second plug-in block (5) is connected to the mold flow channel, and the outlet of the molding flow channel is located on the side wall of the molding boss (311). The upper mold plate (1) and the lower mold plate (2) are molded together so that the space between the molding boss (311) of the upper mold core and the molding cavity (321) of the lower mold core of each pair of mold cores forms a keycap molding cavity (7) which is connected to the accessory molding cavity (6).

2. The combined keycap injection mold core according to claim 1, characterized in that: The bottom surfaces of the upper mold plate (1) and the upper mold core (31), and the top surfaces of the lower mold plate (2) and the lower mold core (32) are all provided with flow channel clearance grooves (8) for accommodating the mold flow channel.

3. The combined keycap injection mold core according to claim 1, characterized in that: The molding flow channel (51) is in an arc shape that bends upward, and the inlet cross-sectional area of ​​the molding flow channel (51) is larger than the outlet cross-sectional area of ​​the molding flow channel.

4. The combined keycap injection mold core according to claim 1 or 3, characterized in that: The number of the second plug blocks (5) is multiple, and the multiple second plug blocks are combined to be integrally plugged into the corresponding accessory forming hole (312), and the side walls of two adjacent second plug blocks are provided with open grooves, and a forming flow channel is formed by the combination of the two open grooves.

5. The combined keycap injection mold core according to claim 1 or 3, characterized in that: The bottom surface of the second plug block (5) is a two-stage stepped surface, and the step height of the two-stage stepped surface is adapted to the height of the forming boss. The inlet of the forming flow channel (51) is located on the first tread of the second plug block stepped surface, and the outlet of the forming flow channel (51) is located on the riser of the stepped surface.

6. The combined keycap injection mold core according to claim 1, characterized in that: The top surface of each lower mold core (32) is provided with an exhaust channel (9) surrounding the corresponding molding cavity (321).

7. The combined keycap injection mold core according to claim 1, characterized in that: The top end of the second plug block (5) is provided with a positioning flange (52), and the upper end opening of the accessory forming hole corresponding to the second plug block is provided with a positioning step (10); the second plug block (5) is plugged into the corresponding accessory forming hole, and is positioned by the cooperation of the positioning flange (52) and the positioning step (10).

8. The combined keycap injection mold core according to claim 1, characterized in that: It also includes a plurality of connecting rods (11), the lower end side walls of the connecting rods (11) are provided with positioning ring grooves (111), the top ends of a plurality of first plug blocks (4) are provided with positioning bosses (42), the upper ends of the connecting rods (11) are connected to the mold frame, and each of the first plug blocks (4) is inserted into a corresponding accessory forming hole, and positioning is formed by the positioning boss (42) cooperating with the positioning ring groove (111) of the connecting rod.

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