Jack-free injection mold and injection molding machine

Abstract

The utility model relates to the technical field of molds, in particular to a clamping-opening-free injection mold and an injection molding machine. The clamping-opening-free injection mold comprises a first mold core and a second mold core which can be closed together, and a first runner is formed between the first mold core and the second mold core; a first insert is arranged on the second mold core, and an oxhorn-shaped second runner is formed between the first insert and the second mold core; and the second runner is communicated with the first runner, and the second runner is embedded into the cavity of the second mold core. And the first runner is connected with the cavity through an ox-horn-shaped second runner. The injection molding material can be injected from the inner wall side of the product through the ox-horn-shaped second runner, the appearance surface of the product does not have a clamping opening, the appearance of the product is flat and smooth, and the requirement of the appearance surface can be better met.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a clampless injection mold and an injection molding machine. Background Art

[0002] Many electronic device housings on the market are produced using injection molding. Some housings have high requirements for appearance, so the exterior surface (appearance) of the product cannot be clipped. However, some injection molds on the market have a direct connection between the cavity and the runner. As a result, the products produced with these molds have clips on the exterior surface, which does not meet production requirements.

[0003] For example, the two-color mold for a bowl-shaped injection molded part disclosed in Chinese patent application number CN201510111972.2 specifically discloses that "the hard rubber runner is connected to the left cavity, and the soft rubber runner is connected to the right cavity." After the product is molded, a clamp will remain on the outer surface of the product, which cannot meet the production appearance requirements.

[0004] Another example is a two-shot injection mold disclosed in Chinese patent application number CN201821582978.3. It specifically states that "a first flow channel is provided on one side of the first molding cavity, the first flow channel is connected to the first molding cavity, and a second flow channel is provided on one side of the second molding cavity, the second flow channel is connected to the second molding cavity." After the product is molded, a clamping edge is also left on the outer surface of the product, which also fails to meet production appearance requirements. Utility Model Content

[0005] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a clampless injection mold, which connects the first flow channel and the cavity through a horn-shaped second flow channel, so that no clamps will be generated on the product surface, thereby overcoming the shortcomings of the prior art.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The present application provides a clampless injection mold, comprising a first mold core and a second mold core that can be closed together, with a first flow channel formed between the first mold core and the second mold core; a first insert is provided on the second mold core, and a horn-shaped second flow channel is formed between the first insert and the second mold core; the second flow channel is connected to the first flow channel, and the second flow channel is buried in the mold cavity of the second mold core.

[0008] Preferably, the first insert is provided with an arc-shaped first groove; the second mold core is provided with a mounting groove, and the groove wall of the mounting groove is provided with an arc-shaped second groove; the first insert is embedded in the mounting groove, and the first groove and the second groove are closed to form the second flow channel.

[0009] Preferably, a first positioning block is provided at the bottom of the first insert, a first positioning opening is provided at the notch position of the installation slot, and the first positioning block is embedded in the first positioning opening.

[0010] Preferably, both ends of the cavity are connected to second flow channels, and an exhaust groove is provided in the middle of the cavity.

[0011] Preferably, the first flow channel includes a main flow channel and branch flow channels that are connected, the ends of some main flow channels are connected to two symmetrical second flow channels, and the ends of the branch flow channels are connected to one second flow channel.

[0012] Preferably, the second mold core is provided with a plurality of ejector pins which pass through the mold cavity and the first flow channel; the first mold core is provided with an insert pin which can penetrate into the mold cavity.

[0013] Preferably, a plurality of second positioning blocks are provided at the edge of the first mold core, a plurality of second positioning openings are provided at the edge of the second mold core, and the second positioning blocks are embedded in the second positioning openings.

[0014] Preferably, cooling pipes are passed through the first mold core and the second mold core.

[0015] Preferably, the first flow channel gradually rises from the center of the top of the second mold core toward the surrounding areas.

[0016] The present application provides an injection molding machine, comprising the clampless injection mold, wherein the clampless injection mold is arranged on a mold frame of the machine.

[0017] This utility model offers significant advantages and benefits over existing technologies. Specifically, as can be seen from the above technical solution, the first and second mold cores close together as the mold closes. A second, horn-shaped runner connects the first runner and the mold cavity. The injection molding compound flows from the first runner to the second runner and then into the mold cavity. This horn-shaped second runner allows the injection molding compound to be injected from the inner wall of the product, eliminating any nipping marks on the outer surface (appearance), resulting in a smooth and even appearance that meets the desired appearance requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the separation state of the first mold core and the second mold core of an embodiment of the present utility model.

[0019] Figure 2 It is a schematic diagram of the exploded state of an embodiment of the present utility model.

[0020] Figure 3 It is a schematic diagram of the exploded state of an embodiment of the present utility model.

[0021] Figure 4 This is a schematic diagram of the second mold core of an embodiment of the present utility model.

[0022] Description of the accompanying drawings:

[0023] 10. First mold core; 11. Insert pin; 12. Second positioning block; 20. Second mold core; 21. Cavity; 22. Mounting groove; 23. First positioning port; 24. Second groove; 25. Second positioning port; 210. First flow channel; 211. Main flow channel; 212. Branch flow channel; 220. First insert; 221. First groove; 223. Second flow channel; 224. First positioning block; 225. Discharge port. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments.

[0025] Please refer to Figures 1 to 4 As shown, it shows the specific structure of the preferred embodiment of the present utility model, which is a clampless injection mold.

[0026] The first flow channel 210 and the cavity 21 are connected by a second horn-shaped flow channel 223. This allows the injection molding material to flow downward, then upward, and finally from the inner wall of the product 30. This results in a smooth and flat surface on the product 30 without any nips, thus better meeting the requirements of the appearance.

[0027] The present application provides a clampless injection mold, comprising a first mold core 10 and a second mold core 20 that can be closed together. A first runner 210 is formed between the first mold core 10 and the second mold core 20. A first insert 220 is provided on the second mold core 20, forming a second, horn-shaped runner 223 between the first insert 220 and the second mold core 20. The second runner 223 communicates with the first runner 210 and is embedded in the mold cavity 21 of the second mold core 20. More specifically, the clampless injection mold comprises an upper mold and a lower mold. The upper mold comprises a first mold frame and a first mold core 10; the upper mold comprises a second mold frame and a second mold core 20. The upper and lower molds are closed, with the first mold core 10 and the second mold core 20 closed together. Injection material is injected from an injection port, enters the first runner 210, then flows into the horn-shaped second runner 223, and then enters the mold cavity 21 from bottom to top. When the injection plastic enters the mold cavity 21, the discharge port 225 of the second flow channel 223 injects the injection plastic from the inner wall side of the product 30, so that no clamping is produced on the appearance surface of the product 30, and the surface of the product 30 is smooth and flat, which can better meet production requirements.

[0028] Preferably, the first insert 220 is provided with an arcuate first groove 221; the second mold core 20 is provided with a mounting groove 22, and the groove wall of the mounting groove 22 is provided with an arcuate second groove 24; the first insert 220 is embedded in the mounting groove 22, and the first groove 221 and the second groove 24 are closed to form the second flow channel 223. A first positioning block 224 is provided at the bottom of the first insert 220, and a first positioning opening 23 is provided at the notch position of the mounting groove 22, and the first positioning block 224 is embedded in the first positioning opening 23. When the first insert 220 is assembled, the first insert 220 is embedded in the mounting groove 22, and the first positioning block 224 is embedded in the first positioning opening 23, which helps to ensure the accuracy of the installation. The first groove 221 and the second groove 24 are closed to form the second flow channel 223, so that the second flow channel 223 has a bullhorn shape (similar to an arc). The first groove 221 and the second groove 24 are machined and formed using CNC equipment.

[0029] Preferably, the mold cavity 21 is connected to a second flow channel 223 at both ends, and a venting groove is provided in the middle of the mold cavity 21. Plastic can be injected from both ends of the product 30, with gas then exhausted from the venting groove in the middle of the mold cavity 21. This design allows for more uniform injection of plastic into the mold cavity 21. This design is particularly advantageous for slender products 30, such as earphone casings, keyboard casings, and mobile phone cases.

[0030] Preferably, the first flow channel 210 includes a main flow channel 211 and branch flow channels 212 that are connected. The ends of the main flow channels 211 are connected to two symmetrical second flow channels 223, and the ends of the branch flow channels 212 are connected to a second flow channel 223. In this embodiment, four cavities 21 are provided on the second mold core 20. The second flow channels 223 are symmetrically arranged, similar to the left and right sides of two bull horns. Therefore, this design can simultaneously inject four products 30 at a time, with material being injected at both ends of each product 30, resulting in very high work efficiency.

[0031] Preferably, the second mold core 20 is provided with a plurality of ejector pins that pass through the mold cavity 21 and the first runner 210. The first mold core 10 is provided with an insert pin 11 that can penetrate the mold cavity 21. Inserting the insert pin 11 into the mold cavity 21 facilitates forming holes in the product 30. Passing the ejector pins through the mold cavity 21 and the first runner 210 facilitates ejection of the product 30 and the sprue material as a whole, preventing damage to the product 30.

[0032] Preferably, a plurality of second positioning blocks 12 are provided at the edge of the first mold core 10, and a plurality of second positioning openings 25 are provided at the edge of the second mold core 20, and the second positioning blocks 12 are embedded in the second positioning openings 25. The cooperation between the second positioning blocks 12 and the second positioning openings 25 helps to ensure the accuracy when the first mold core 10 and the second mold core 20 are closed.

[0033] Preferably, cooling tubes are inserted into the first mold core 10 and the second mold core 20. The cooling tubes are preferably stainless steel tubes. The cooling tubes can cool the first mold core 10 and the second mold core 20, further facilitating rapid molding of the product 30 and improving production efficiency.

[0034] Preferably, the first flow channel 210 is gradually raised from the center of the top of the second mold core 20 to the surrounding areas. This design allows the injection molded material to buffer for a period of time after entering the first flow channel 210. This design is more conducive to exhausting the air in the flow channel and preventing the product 30 from having air holes.

[0035] The present application provides an injection molding machine, comprising the clampless injection mold, wherein the clampless injection mold is arranged on a mold frame of the machine.

[0036] In summary, the key design feature of the present invention lies in the connection between the first flow channel 210 and the mold cavity 21 via the horn-shaped second flow channel 223. The horn-shaped second flow channel 223 allows the injection molding material to be injected from the inner wall of the product 30, ensuring that the product 30 does not have any nipping marks on its surface, thereby better meeting the surface requirements.

[0037] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A clampless injection mold, characterized in that: The invention comprises a first mold core and a second mold core which can be closed together, wherein a first flow channel is formed between the first mold core and the second mold core; The second mold core is provided with a first insert, and a horn-shaped second flow channel is formed between the first insert and the second mold core; the second flow channel is connected to the first flow channel, and the second flow channel is buried in the mold cavity of the second mold core.

2. The clampless injection mold according to claim 1, characterized in that: The first insert is provided with an arc-shaped first groove; the second mold core is provided with a mounting groove, and the groove wall of the mounting groove is provided with an arc-shaped second groove; the first insert is embedded in the mounting groove, and the first groove and the second groove are closed to form the second flow channel.

3. The clampless injection mold according to claim 2, characterized in that: A first positioning block is provided at the bottom of the first insert, a first positioning opening is provided at the notch position of the installation slot, and the first positioning block is embedded in the first positioning opening.

4. The clampless injection mold according to claim 1, characterized in that: Both ends of the cavity are connected with second flow channels, and the middle of the cavity is provided with an exhaust groove.

5. The clampless injection mold according to claim 1 or 4, characterized in that: The first flow channel includes a main flow channel and branch flow channels that are connected. The ends of some main flow channels are connected to two symmetrical second flow channels, and the ends of the branch flow channels are connected to one second flow channel.

6. The clampless injection mold according to claim 1, characterized in that: The second mold core is provided with a plurality of ejector pins which pass through the mold cavity and the first flow channel; the first mold core is provided with an inserting pin which can penetrate into the mold cavity.

7. The clampless injection mold according to claim 1, characterized in that: A plurality of second positioning blocks are provided at the edge of the first mold core, a plurality of second positioning openings are provided at the edge of the second mold core, and the second positioning blocks are embedded in the second positioning openings.

8. The clampless injection mold according to claim 1, characterized in that: Cooling pipes are inserted into the first mold core and the second mold core.

9. The clampless injection mold according to claim 1, characterized in that: The first flow channel gradually rises from the center of the top of the second mold core to the surrounding areas.

10. An injection molding machine, characterized in that: The clampless injection mold comprises the clampless injection mold according to any one of claims 1 to 9, and the clampless injection mold is arranged on a mold frame of a machine.

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