Two-color mold for single-color injection molding machine

Abstract

The present invention discloses a two-color mold for a single-color injection molding machine, comprising a one-shot mold, a two-shot mold and an insert; the one-shot upper mold core, the one-shot lower mold core and a plurality of one-shot side mold cores enclose a one-shot cavity for accommodating the insert, and a one-shot injection molded part is formed between the one-shot cavity and the insert; the insert comprises an insert portion and a plug-in portion protruding from the lower end of the insert portion, and the one-shot lower mold core is provided with a first plug-in hole matched with the plug-in portion; the two-shot upper mold core, the two-shot lower mold core and a plurality of two-shot side mold cores enclose a two-shot cavity for accommodating the insert, and a two-shot injection molded part is formed between the insert and the two-shot cavity, and the two-shot lower mold core is provided with a second plug-in hole matched with the plug-in portion, and the demoulding assembly is used to push the top surface of the two-shot lower mold core from the plug-in portion to the insert portion to eject the two-shot injection molded part. The two-color mold for a single-color injection molding machine provided by the present invention is convenient for a single-color injection molding machine to produce two-shot injection molded parts.

Description

Technical Field

[0001] The invention relates to the technical field of molds, in particular to a double-color mold for a single-color injection molding machine. Background Art

[0002] Two-color injection refers to a process that uses two different colors or different types of plastics to make finished products with different colors or different hardness through injection molding. At present, two-color injection molding is generally completed by a two-color injection molding machine. The two-color mold usually has two molds, one half is installed on the fixed mold plate of the two-color injection molding machine, and the other half is installed on the movable mold rotating plate. After the first material is injected, the mold is opened, and the movable mold rotates 180° with the product. At this time, the movable mold is not ejected, and then the mold is closed to inject the second material. After cooling, the mold is opened, and the product on the movable mold side is ejected, completing the two-color injection molding. However, since the cost of a two-color injection molding machine is much higher than that of a single-color injection molding machine, for small and medium-sized batches of products that require secondary injection molding, if an additional two-color injection molding machine is purchased for this purpose, the cost will be too high. Summary of the invention

[0003] The object of the present invention is to provide a two-color mold for a single-color injection molding machine, so as to facilitate the single-color injection molding machine to produce double-shot injection molded parts.

[0004] The technical solution adopted by the double-color mold for a single-color injection molding machine disclosed in the present invention is:

[0005] A two-color mold for a single-color injection molding machine, comprising a one-shot mold, a two-shot mold and an insert; the one-shot mold comprises an upper mold core, a lower mold core and a plurality of one-shot side mold cores, the upper mold core, the lower mold core and the plurality of one-shot side mold cores enclose a one-shot cavity for accommodating the insert, and an injection molded part is formed between the one-shot cavity and the insert; the insert comprises an insert portion and a plug-in portion protruding from the lower end of the insert portion, the one-shot lower mold core is provided with a first plug-in hole matched with the plug-in portion, and the insert further comprises a A clamping portion for detachably connecting with the ejector rod of the injection molding machine; the two-shot mold includes a two-shot upper mold core, a two-shot lower mold core and a plurality of two-shot side mold cores, the two-shot upper mold core, the two-shot lower mold core and a plurality of two-shot side mold cores form a two-shot cavity for accommodating an insert, and a two-shot injection-molded part is formed between the insert and the two-shot cavity, the two-shot lower mold core is provided with a second plug-in hole that cooperates with the plug-in portion, and also includes a demolding assembly, the demolding assembly is used to push the top surface of the two-shot lower mold core from the plug-in portion to the insert portion to eject the two-shot injection-molded part.

[0006] As a preferred solution, the plug-in portion includes an upper plug-in portion and a lower plug-in portion, the periphery of the upper plug-in portion is surrounded by an arc surface and at least one positioning plane, and the first plug-in hole and the second plug-in hole both match the upper plug-in portion.

[0007] As a preferred embodiment, the bottom surface of the first-shot lower mold core abuts against a first-shot support plate for supporting the plug-in part, and the first-shot support plate is provided with a first accommodating hole matching the plug-in lower part; the lower end surface of the second-shot lower mold core abuts against a second-shot support plate for supporting the plug-in part, and the second-shot support plate is provided with a second accommodating hole matching the plug-in lower part.

[0008] As a preferred embodiment, the clamping portion includes a groove opened on the bottom surface of the plug-in portion, a strip hole opened on the bottom surface of the groove, and an inner clamping cavity located at one end of the strip hole away from the groove. The top end of the push rod forms a clamping block matching the strip hole. The clamping block extends into the groove and from the strip hole into the inner clamping cavity, and then completes the clamping by rotating a preset angle.

[0009] As a preferred solution, the demoulding assembly includes a thrust piece, a plurality of push rods, a push plate and a push rod fixing plate, one end of the push rods is fixed to the second-shot lower mold core, and the other end is confined between the push rod fixing plate and the push plate, and the output end of the thrust piece is arranged on the push plate.

[0010] As a preferred embodiment, the first-shot side mold core includes a slider with an inclined groove formed on the slider; the first-shot upper mold core is fixed to a first-shot upper mold, and the first-shot upper mold is fixed with an inclined top, and the inclined top includes a vertical section and an inclined section extending into the inclined groove.

[0011] The beneficial effects of the two-color mold for a single-color injection molding machine disclosed in the present invention are as follows: an insert is placed in a shot mold, a plug-in portion of the insert extends downward into a first plug-in hole provided in a shot lower mold core, and a clamping portion of the insert is clamped on a push rod of a single-color injection molding machine, and a shot molded part is formed between the shot cavity and the insert. After the injection, a shot upper mold core is separated from a shot lower mold core by the action of the single-color injection molding machine, and a shot side mold core is also separated from a shot molded part. Under the push of the push rod of the injection molding machine, the insert and the shot molded part are separated from the shot lower mold core, and after separation, the insert and the shot molded part are removed from the push rod;

[0012] Put the insert and the one-shot molded part into the two-shot mold, and the plug-in part of the insert extends downward into the second plug-in hole opened in the two-shot lower mold core, and the clamping part of the insert is clamped on the ejector pin of another single-color injection molding machine for secondary injection molding, so that the two-shot injection molded part is formed between the insert and the two-shot cavity. After injection, the two-shot upper mold core is separated from the two-shot lower mold core by the single-color injection molding machine, and the two-shot side mold core is also separated from the two-shot injection molded part. The demolding assembly pushes the top surface of the two-shot lower mold core from the plug-in part to the insert part, so as to force the two-shot injection molded part located on the surface of the insert part to separate from the insert. After separation, the insert and the two-shot injection molded part are separated from the two-shot lower mold core by the push of the ejector pin of another injection molding machine. After separation, the two-shot injection molded part and the insert are removed respectively, and then the insert is returned to the one-shot mold, and the cycle is repeated in sequence. The two-color mold disclosed in the present invention can be applied to the production of double-shot injection molded parts by a single-color injection molding machine without the need to purchase a high-cost two-color injection molding machine, thereby greatly reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic structural diagram of a one-shot mold of a two-color mold for a single-color injection molding machine.

[0014] Figure 2 The present invention is a front view of a one-shot mold of a two-color mold for a single-color injection molding machine.

[0015] Figure 3 It is an AA cross-sectional view of a one-shot mold of a two-color mold for a single-color injection molding machine according to the present invention.

[0016] Figure 4 The present invention is a side view of a one-shot mold of a two-color mold for a single-color injection molding machine.

[0017] Figure 5 It is a BB sectional view of a one-shot mold of a two-color mold for a single-color injection molding machine according to the present invention.

[0018] Figure 6 The present invention is a schematic structural diagram of a two-shot mold of a double-color mold for a single-color injection molding machine.

[0019] Figure 7 The present invention is a front view of a two-shot mold of a two-color mold for a single-color injection molding machine.

[0020] Figure 8 It is a CC sectional view of a two-shot mold of a two-color mold for a single-color injection molding machine according to the present invention.

[0021] Fig. 9 The present invention is a side view of a two-shot mold of a two-color mold for a single-color injection molding machine.

[0022] Fig.10 It is a DD sectional view of a two-shot mold of a two-color mold for a single-color injection molding machine according to the present invention.

[0023] Fig.11 The present invention is a front view of a two-shot mold of a two-color mold for a single-color injection molding machine.

[0024] Fig.12 It is an EE sectional view of a two-shot mold of a two-color mold for a single-color injection molding machine according to the present invention.

[0025] Fig.13 The present invention is a schematic structural diagram of an insert for a double-color mold of a single-color injection molding machine.

[0026] Fig.14 The present invention is a cross-sectional view of an insert of a double-color mold for a single-color injection molding machine. DETAILED DESCRIPTION

[0027] The present invention will be further described and illustrated below in conjunction with specific embodiments and accompanying drawings:

[0028] Please refer to Figure 1 , Figure 6 and Fig.13 A two-color mold for a single-color injection molding machine includes a first-shot mold 10, a second-shot mold 20, and an insert 30.

[0029] Please refer to Figure 2-Figure 5 The one-shot mold 10 includes an upper shot core 11, a lower shot core 12, and a plurality of one-shot side cores 13. The upper shot core 11, the lower shot core 12, and the plurality of one-shot side cores 13 form a shot cavity for accommodating the insert 30, and the one-shot injection molded part is formed between the one-shot cavity and the insert 30.

[0030] Please refer to Figure 2 , Figure 3 , Fig.13 , Fig.14 The insert 30 includes an insert portion 31 and a plug-in portion 32 protruding from the lower end of the insert portion 31, and a first plug-in hole matching the plug-in portion 32 is provided in the lower mold core 12. The insert 30 also includes a clamping portion 33 for detachably connecting with the ejector rod 40 of the injection molding machine.

[0031] Please refer to Figure 6-Figure 10 The two-shot mold 20 includes a two-shot upper mold core 21, a two-shot lower mold core 22, and a plurality of two-shot side mold cores 23. The two-shot upper mold core 21, the two-shot lower mold core 22, and a plurality of two-shot side mold cores 23 form a two-shot cavity for accommodating the insert 30, and the two-shot injection molded part is formed between the insert 30 and the two-shot cavity. The two-shot lower mold core 22 is provided with a second plug hole that cooperates with the plug-in portion 32. The two-shot mold 20 also includes a demolding assembly 24, which is used to push the top surface of the two-shot lower mold core 22 from the plug-in portion 32 to the insert portion 31 to eject the two-shot injection molded part.

[0032] Please refer to Figure 2 , Figure 3 , Fig.13 , Fig.14 The plug-in portion 32 includes an upper plug-in portion 321 and a lower plug-in portion 322. The periphery of the upper plug-in portion 321 is surrounded by an arc surface 3211 and at least one positioning plane 3212. The first plug-in hole and the second plug-in hole are matched with the upper plug-in portion 321. The outer shape of the upper plug-in portion 321 is slightly larger than the lower end surface size of the insert portion 31, and slightly smaller than the lower end surface size of the two-shot injection molded part, so that the insert portion 31 will not be blocked in the process of the two-shot lower mold core 22 pushing out the two-shot injection molded part. When installing the insert 30, the orientation of the insert 30 is positioned by making the plane on the first plug-in hole or the second plug-in hole opposite to the positioning plane.

[0033] Please refer to Figure 2-Figure 5 The bottom surface of the first-shot lower mold core 12 abuts against a first-shot support plate 121 for supporting the plug-in portion 32, and a first receiving hole matching the plug-in lower portion 322 is formed on the first-shot support plate 121. The lower end surface of the second-shot lower mold core 22 abuts against a second-shot support plate 221 for supporting the plug-in portion 32, and a second receiving hole matching the plug-in lower portion 322 is formed on the second-shot support plate 221.

[0034] Please refer to Figure 2 , Figure 3 , Fig.13 , Fig.14 The clamping part 33 includes a groove 333 formed on the bottom surface of the plug-in part 32, a strip hole 331 formed on the bottom surface of the groove 33, and an inner clamping cavity 332 located at one end of the strip hole 331 away from the bottom surface of the plug-in part 32. The top end of the push rod 40 forms a clamping block that matches the strip hole 331. The clamping block extends into the groove 333 and extends from the strip hole 331 into the inner clamping cavity 332, and then the clamping is completed by rotating a preset angle. When installing the insert 30, align the strip hole 331 with the clamping block of the push rod 40, move the insert 30 so that the clamping block of the push rod 40 extends into the inner clamping cavity 332, and then rotate the insert 30 90° to complete the clamping. When removing the insert 30, first rotate the insert 30 in the opposite direction by 90° and then remove it.

[0035] Please refer to Figure 6 , Fig.11 , Fig.12The demoulding assembly 24 includes a thrust piece 241, a plurality of push rods 242, a push plate 243 and a push rod fixing plate 244. One end of the plurality of push rods 242 is fixed to the second shot lower mold core 22, and the other end is limited between the push rod fixing plate 244 and the push plate 243. The output end of the thrust piece 241 is arranged on the push plate 243. The thrust piece 241 is a cylinder, and two groups of cylinders are arranged on opposite sides of the push plate 243. The thrust piece 241 pushes the push plate 243 to move, and the push plate 243 drives the push rods 242 and the second shot lower mold core 22 to move. When the top surface of the second shot lower mold core 22 moves from the plug-in portion 32 to the insert portion 31, the second shot injection molded part formed on the surface of the insert portion 31 is ejected.

[0036] Please refer to Figure 4 and Figure 5 The first-shot side mold core 13 includes a slider 131, and the slider 131 is provided with an inclined groove; the first-shot upper mold core 11 is fixed to the first-shot upper mold 14, and the first-shot upper mold 14 is fixed with an inclined top 141, and the inclined top 141 includes a vertical section 1411 and an inclined section 1412 extending into the inclined groove. When the mold is separated, the first-shot upper mold 14 and the first-shot upper mold core 11 move away from the first-shot lower mold core 12, and the inclined top 141 moves with it, thereby applying lateral pressure to the slider 131 to force the slider 131 to move laterally and away from the insert 30, completing the separation of the first-shot side mold core 13. The demolding structure of the second-shot side mold core 23 is the same as that of the second-shot side mold core 23, which will not be repeated here.

[0037] The two-color mold for a single-color injection molding machine disclosed in the present invention is to place an insert 30 into a shot mold 10, and the plug-in portion 32 of the insert 30 extends downward into a first plug-in hole opened in a shot lower mold core 12, and the clamping portion 33 of the insert 30 is clamped on a push rod 40 of a single-color injection molding machine, and perform one injection molding, and a shot molded part is formed between a shot cavity and the insert 30. After injection molding, the shot upper mold core 11 is separated from the shot lower mold core 12 by the action of the single-color injection molding machine, and the shot side mold core 13 is also separated from the shot molded part. Under the push of the push rod 40 of the injection molding machine, the insert 30 and the shot molded part are separated from the shot lower mold core 12, and after separation, the insert 30 and the shot molded part are removed from the push rod 40.

[0038] The insert 30 and the first shot molded part are placed into the second shot mold 20, and the plug-in part 32 of the insert 30 extends downward into the second plug-in hole provided in the second shot lower mold core 22, and the clamping part 33 of the insert 30 is clamped on the ejector pin 40 of another single-color injection molding machine for secondary injection molding. The second shot molded part is formed between the insert 30 and the second shot cavity. After injection molding, the second shot upper mold core 21 is separated from the second shot lower mold core 22 by the single-color injection molding machine, and the second shot side mold core 23 is also separated from the second shot molded part. The demolding assembly 24 pushes the top surface of the second shot lower mold core 22 from the plug-in part 32 to the insert part 31, so as to force the second shot molded part located on the surface of the insert part 31 to separate from the insert 30. After separation, the insert 30 and the second-shot molded part are separated from the second-shot lower mold core 22 under the push of the ejector 40 of another injection molding machine. After separation, the second-shot molded part and the insert 30 are removed respectively, and then the insert 30 is sent back to the first-shot mold 10, and the cycle is repeated. The two-color mold disclosed in the present invention can be used for single-color injection molding machines to produce double-shot molded parts without the need to purchase high-cost two-color injection molding machines, which greatly reduces production costs.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A two-color mold for a single-color injection molding machine, characterized in that: Includes one-shot mold, two-shot mold and inserts; The one-shot mold comprises an upper shot core, a lower shot core and a plurality of side shot cores, wherein the upper shot core, the lower shot core and the side shot cores form a shot cavity for accommodating the insert, and an injection molded part is formed between the one-shot cavity and the insert; The insert comprises an insert part and a plug-in part protruding from the lower end of the insert part, the first injection mold core is provided with a first plug-in hole matched with the plug-in part, and the insert also comprises a clamping part for detachably connecting with the ejector rod of the injection molding machine; The two-shot mold comprises a two-shot upper mold core, a two-shot lower mold core and a plurality of two-shot side mold cores, wherein the two-shot upper mold core, the two-shot lower mold core and the plurality of two-shot side mold cores enclose a two-shot cavity for accommodating an insert, and a two-shot injection molded part is formed between the insert and the two-shot cavity, and the two-shot lower mold core is provided with a second plug hole matched with the plug part, and further comprises a demoulding assembly, wherein the demoulding assembly is used to push the top surface of the two-shot lower mold core from the plug part to the insert part to eject the two-shot injection molded part; The plug-in portion comprises an upper plug-in portion and a lower plug-in portion, the periphery of the upper plug-in portion is surrounded by an arc surface and at least one positioning plane, and the first plug-in hole and the second plug-in hole are both matched with the upper plug-in portion; The bottom surface of the first shot lower mold core abuts against a first shot support plate for supporting the plug-in portion, and the first shot support plate is provided with a first accommodation hole matching the plug-in lower portion; The lower end surface of the second-shot lower mold core abuts against a second-shot support plate for supporting the plug-in portion, and the second-shot support plate is provided with a second accommodating hole matching the plug-in lower portion; The clamping portion includes a groove opened on the bottom surface of the plug-in portion, a strip hole opened on the bottom surface of the groove, and an inner clamping cavity located at one end of the strip hole away from the groove. The top end of the push rod forms a clamping block matching the strip hole. The clamping block extends into the groove and from the strip hole into the inner clamping cavity, and then completes the clamping by rotating a preset angle.

2. The two-color mold for a single-color injection molding machine according to claim 1, characterized in that: The demoulding assembly includes a thrust piece, a plurality of push rods, a push plate and a push rod fixing plate. One end of the push rods is fixed to the second-shot lower mold core, and the other end is restricted between the push rod fixing plate and the push plate. The output end of the thrust piece is arranged on the push plate.

3. The two-color mold for a single-color injection molding machine according to claim 1, characterized in that: The first shot side mold core includes a slider, and the slider is provided with an oblique groove; The shot upper mold core is fixed to the shot upper mold, and the shot upper mold is fixed with an inclined top, which includes a vertical section and an inclined section extending into the inclined groove.

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