Injection molds and injection methods

Abstract

This invention belongs to the field of injection molding technology and discloses an injection mold and injection method. The injection mold includes a mold core, a slider, and an ejector pin. The mold core has a molding section and contains a sliding channel, an ejector channel, and a first gating system. The sliding channel and the ejector channel are interconnected, with one end of the ejector channel extending to the molding section. The first gating system and the sliding channel are also interconnected. The slider is slidably disposed within the sliding channel, and an injection protrusion is formed on its surface. A second gating system is provided on the slider, with one end extending to the injection protrusion. The ejector pin is slidably disposed within the ejector channel and has a connecting groove on one side. The injection method uses the aforementioned injection mold. In this invention, by sliding the slider within the mold core and providing the injection protrusion on the slider, a corresponding material groove can be formed on the molding residue in the connecting groove. When the injection molding operation is completed, the residual material after the gate is removed is located at the bottom of the material groove.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and more particularly to an injection mold and an injection method. Background Technology

[0002] like Figure 1 As shown, existing injection molds using hook-shaped gates typically include a mold core 1000 and an ejector pin 2000. The mold core 1000 has a molding section on its surface and an ejector channel and a gating channel 1001 that are interconnected. One end of the ejector channel extends into the molding section. The ejector pin 2000 is movably inserted into the ejector channel and has a connecting groove on one side. When the ejector pin 2000 is in its initial position relative to the mold core 1000, the gating channel 1001 is connected to the ejector channel through the connecting groove. The injection molded plastic can pass through the gating channel 1001 and then through the ejector pin 2000. The connecting groove on one side of 00 is injected into the molding part. After injection molding is completed, the gate 3000 in the gating channel 1001 is first pulled out. At this time, there are shavings 5000 of the molding residue 4000 connected to the connecting groove in the gating channel 1001. When the ejector pin 2000 pushes the injection molded product on the molding part away from the mold core 1000, the shavings 5000 will be left in the gating channel 1001 due to the scraping force. In the next injection molding, the injection plastic will carry the shavings 5000 to the surface of the injection molded product, affecting the molding quality of the injection molded product.

[0003] To address the aforementioned issues, existing technologies typically involve adding a purging process to blow out the material debris 5000 from the gating channel 1001 for cleaning. However, this additional purging process increases the cost of injection molding and reduces its efficiency. Furthermore, since the material debris 5000 is usually located deep within the gating channel 1001, the purging results cannot be visually observed, and it cannot be guaranteed that the material debris 5000 will be completely removed from the gating channel 1001. Summary of the Invention

[0004] The purpose of this invention is to provide an injection mold and injection method that can prevent the generation of material debris from the source.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Injection molds, including:

[0007] The mold core has a molding part, and the mold core has a sliding channel, an ejection channel and a first gating channel. The sliding channel and the ejection channel are interconnected. One end of the ejection channel extends to the molding part. The first gating channel and the sliding channel are interconnected.

[0008] A slider is slidably disposed in the sliding channel. An injection protrusion is formed on the surface of the slider. A second gating channel is provided on the slider, and one end of the second gating channel extends through the injection protrusion.

[0009] The ejector pin is slidably disposed in the ejection channel and has a connecting groove on one side. During injection molding, the other end of the second gating channel is connected to the first gating channel. The injection protrusion extends into the connecting groove in the ejection channel. The gating channel formed by the first gating channel and the second gating channel is connected to the molding part through the connecting groove.

[0010] Preferably, the slider is provided with a contact surface, and the injection molding protrusion protrudes from the contact surface. During the injection molding operation, the contact surface is in contact with the side wall of the ejector pin.

[0011] Preferably, the cross-sectional area of ​​the first gating channel gradually decreases from the end away from the second gating channel to the end connected to the second gating channel.

[0012] Preferably, the cross-sectional area of ​​the second gating channel gradually decreases from the end connected to the first gating channel to the end away from the first gating channel.

[0013] Preferably, during injection molding, the end face of the ejector pin is flush with the port of the ejector channel on the molding part.

[0014] Preferably, the slider slides relative to the mold core along a first direction, and the ejector pin slides relative to the mold core along a second direction, wherein the first direction is perpendicular to the second direction.

[0015] Preferably, in the third direction, the connecting groove extends through both sides of the ejector pin, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0016] Preferably, the connecting groove includes a first groove wall surface, which is parallel to the third direction and extends to the end face of the ejector pin at one end. The angle between the first groove wall surface and the end face of the ejector pin is an acute angle.

[0017] Preferably, the connecting groove further includes a second groove wall and a transition arc surface, one end of the transition arc surface being connected to the first groove wall and the other end being connected to the second groove wall, the second groove wall being parallel to the end face of the ejector pin.

[0018] Injection molding method, using the above-mentioned injection mold, including:

[0019] During injection molding, the first and second gating gates, which are interconnected, form a gating channel. The injection head extends into the connecting groove, and the gating channel is connected to the molding part through the connecting groove. The injection plastic flows through the gating channel and the connecting groove in sequence and is injected into the molding part.

[0020] After injection molding is completed, the gate in the gating channel is removed;

[0021] The slider slides relative to the mold core, causing the injection punch to be pulled out of the connecting groove;

[0022] A material groove capable of accommodating the injection molding protrusion is formed on the molding residue in the connecting groove, and material debris remains at the bottom of the groove;

[0023] The ejector pin slides relative to the mold core, carrying away the molding residue and debris, and ejects the molded product from the molding section.

[0024] The beneficial effects of this invention are:

[0025] By sliding a slider inside the mold core and setting an injection protrusion on the slider, a corresponding groove can be formed on the molding residue in the connecting groove. When the injection molding operation is completed, the residual material after the gate is pulled out is located at the bottom of the groove. Finally, when the ejector pin pushes out the molded product after the slider slides to avoid interference between the material residue and the inner wall of the ejection channel, the material residue can be ejected with the product, thus avoiding the generation of material residue from the source and ensuring the cleanliness of the gating channel. Attached Figure Description

[0026] Figure 1 It is a cross-sectional view of an existing injection mold;

[0027] Figure 2 This is a schematic diagram of the structure of the injection mold described in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the mold core structure according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the slider structure according to an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the ejector pin described in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the molding waste, material scraps, and molded product obtained by molding according to the embodiments of the present invention;

[0032] Figure 7 This is a cross-sectional view of the injection mold described in the embodiment of the present invention during injection molding.

[0033] Figure 8This is a cross-sectional view of the injection mold described in the embodiment of the present invention when the gate is being extracted;

[0034] Figure 9 This is a cross-sectional view of the injection mold described in the embodiment of the present invention when the injection protrusion is pulled out of the connecting groove;

[0035] Figure 10 This is a cross-sectional view of the injection mold described in the embodiment of the present invention when ejecting the molded product.

[0036] Figure 1 middle:

[0037] 1000, Mold core; 1001, Gating channel; 2000, Ejector pin; 3000, Gate; 4000, Molding waste; 5000, Material scrap;

[0038] Figures 2-10 middle:

[0039] 1. Model kernel;

[0040] 11. Molding section; 12. Sliding channel; 13. Ejection channel; 14. First gating system;

[0041] 2. Slider;

[0042] 21. Injection molding protrusion; 22. Second runner; 23. Attachment surface;

[0043] 3. Threshold pin;

[0044] 31. Connecting groove; 311. First groove wall; 312. Second groove wall; 313. Transition arc surface;

[0045] 100, gate; 200, molding residue; 201, trough; 300, material scrap; 400, molded product. Detailed Implementation

[0046] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0047] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] like Figures 2-10 As shown, the present invention provides an injection mold, including a mold core 1, a slider 2 and an ejector pin 3. The mold core 1 is provided with a molding part 11. The mold core 1 is provided with a sliding channel 12, an ejection channel 13 and a first gating channel 14. The sliding channel 12 and the ejection channel 13 are interconnected. One end of the ejection channel 13 extends to the molding part 11. The first gating channel 14 and the sliding channel 12 are interconnected. The slider 2 is slidably disposed in the sliding channel 12. The surface of the slider 2 is convex to form an injection protrusion 21. The slider 2 is provided with a second gating channel 22. One end of the second gating channel 22 extends to the injection protrusion 21. The ejector pin 3 is slidably disposed in the ejection channel 13. A connecting groove 31 is provided on one side. During the injection molding operation, the other end of the second gating channel 22 is connected to the first gating channel 14. The injection protrusion 21 extends into the connecting groove 31 in the ejection channel 13. The gating channel formed by the first gating channel 14 and the second gating channel 22 is connected to the molding part 11 through the connecting groove 31.

[0051] In this invention, by sliding a slider 2 inside the mold core 1 and setting an injection protrusion 21 on the slider 2, a material groove 201 can be formed on the molding residue 200 in the connecting groove 31. When the injection molding operation is completed, the residual material 300 after the gate 100 is pulled out is located at the bottom of the material groove 201. Finally, after the slider 2 slides to avoid interference, when the ejector pin 3 ejects the molded product 400, the interference between the material 300 and the inner wall of the ejection channel 13 is avoided, so that the material 300 can be ejected with the product, thus avoiding the generation of material 300 from the source and ensuring the cleanliness of the injection channel.

[0052] Specifically, the slider 2 is provided with a contact surface 23, and the injection molding protrusion 21 protrudes from the contact surface 23. During the injection molding operation, the contact surface 23 is in contact with the side wall of the ejector pin 3. The above arrangement makes the positioning of the slider 2 and the ejector pin 3 more accurate during the injection molding operation.

[0053] In this embodiment, both the slider 2 and the ejector pin 3 are elongated blocks with rectangular cross-sections, which prevents misalignment during sliding within the mold core 1.

[0054] Specifically, the cross-sectional area of ​​the first gating channel 14 gradually decreases from the end opposite to the second gating channel 22 to the end connected to the second gating channel 22. This arrangement ensures the flow rate of the injection molding material in the first gating channel 14.

[0055] More specifically, the cross-sectional area of ​​the second gating system 22 gradually decreases from the end connected to the first gating system 14 to the end away from the first gating system 14. This arrangement ensures the flow rate of the injection molding material in the second gating system 22.

[0056] Specifically, during injection molding, the end face of the ejector pin 3 is flush with the port of the ejector channel 13 on the molding section 11. This arrangement avoids the ejector pin 3 affecting the shape of the molded product 400.

[0057] In this embodiment, a forming part 11 is formed by protrusion on the surface of the mold core 1, and the ejection channel 13 extends through to the end face of the forming part 11.

[0058] Specifically, the slider 2 slides relative to the mold core 1 along a first direction, and the ejector pin 3 slides relative to the mold core 1 along a second direction, with the first direction perpendicular to the second direction. This arrangement allows the scrap 300 to be more efficiently collected within the molding residue 200 in the connecting groove 31.

[0059] More specifically, in the third direction, the connecting groove 31 penetrates both side walls of the ejector pin 3, and the first direction, the second direction, and the third direction are perpendicular to each other. This arrangement effectively increases the flow rate of the injection molding material in the connecting groove 31, thereby improving injection molding efficiency.

[0060] Specifically, the connecting groove 31 includes a first groove wall 311, which is parallel to a third direction and extends at one end to the end face of the ejector pin 3. The included angle between the first groove wall 311 and the end face of the ejector pin 3 is an acute angle. This arrangement ensures that the cross-sectional area of ​​the injection plastic gradually decreases after it flows into the connecting groove 31 from the pouring channel, thus guaranteeing the flow rate of the injection plastic.

[0061] More specifically, the connecting groove 31 also includes a second groove wall 312 and a transition arc surface 313. One end of the transition arc surface 313 is connected to the first groove wall 311, and the other end is connected to the second groove wall 312. The second groove wall 312 is parallel to the end face of the ejector pin 3. During injection molding, in the second direction, the connection port of the pouring channel and the connecting groove 31 is spaced apart from the second groove wall 312.

[0062] The present invention also provides an injection molding method using the above-mentioned injection mold, comprising the following steps:

[0063] Step 1: During the injection molding operation, the first gating channel 14 and the second gating channel 22, which are interconnected, form a gating channel. The injection protrusion 21 extends into the connecting groove 31. The gating channel is connected to the molding part 11 through the connecting groove 31. The injection plastic passes through the gating channel and the connecting groove 31 in sequence and is injected into the molding part 11.

[0064] Step 2: After injection molding is completed, remove the gate 100 from the gating channel.

[0065] Step 3: The slider 2 slides relative to the mold core 1, causing the injection protrusion 21 to be pulled out from the connecting groove 31.

[0066] Step 4: A material groove 201 capable of accommodating the injection molding protrusion 21 is formed on the molding residue 200 in the connecting groove 31. Material debris 300 remains at the bottom of the material groove 201.

[0067] Step 5: The ejector pin 3 slides relative to the mold core 1, carrying the molding residue 200 and the scrap 300, and pushes the molded product 400 away from the molding part 11.

[0068] Step 6: Remove the molding residue 200 and the scrap 300 to obtain the independent molded product 400.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An injection mold, characterized in that, include: A mold core (1) is provided with a molding part (11). The mold core (1) is provided with a sliding channel (12), an ejection channel (13) and a first gating channel (14). The sliding channel (12) and the ejection channel (13) are interconnected. One end of the ejection channel (13) extends through the molding part (11). The first gating channel (14) and the sliding channel (12) are interconnected. A slider (2) is slidably disposed in the sliding channel (12). An injection protrusion (21) is formed on the surface of the slider (2). A second gating channel (22) is provided on the slider (2). One end of the second gating channel (22) extends through to the injection protrusion (21). Ejector pin (3) is slidably disposed in the ejector channel (13) and has a connecting groove (31) on one side. During injection molding, the other end of the second gating channel (22) is connected to the first gating channel (14). The injection protrusion (21) extends into the connecting groove (31) in the ejector channel (13). The gating channel formed by the first gating channel (14) and the second gating channel (22) is connected to the molding part (11) through the connecting groove (31).

2. The injection mold according to claim 1, characterized in that, The slider (2) is provided with a contact surface (23), and the injection protrusion (21) protrudes from the contact surface (23). During injection molding, the contact surface (23) is attached to the side wall of the ejector pin (3).

3. The injection mold according to claim 1, characterized in that, From the end away from the second gating channel (22) to the end connected to the second gating channel (22), the cross-sectional area of ​​the first gating channel (14) gradually decreases.

4. The injection mold according to claim 1, characterized in that, The cross-sectional area of ​​the second gating channel (22) gradually decreases from the end connected to the first gating channel (14) to the end away from the first gating channel (14).

5. The injection mold according to claim 1, characterized in that, During injection molding, the end face of the ejector pin (3) is flush with the port of the ejector channel (13) on the molding part (11).

6. The injection mold according to claim 1, characterized in that, The slider (2) slides relative to the mold core (1) in a first direction, and the ejector pin (3) slides relative to the mold core (1) in a second direction, wherein the first direction is perpendicular to the second direction.

7. The injection mold according to claim 6, characterized in that, In the third direction, the connecting groove (31) penetrates both sides of the ejector pin (3), and the first direction, the second direction and the third direction are perpendicular to each other.

8. The injection mold according to claim 7, characterized in that, The connecting groove (31) includes a first groove wall (311), which is parallel to the third direction and extends to the end face of the ejector pin (3) at one end. The included angle between the first groove wall (311) and the end face of the ejector pin (3) is an acute angle.

9. The injection mold according to claim 8, characterized in that, The connecting groove (31) further includes a second groove wall (312) and a transition arc surface (313). One end of the transition arc surface (313) is connected to the first groove wall (311), and the other end is connected to the second groove wall (312). The second groove wall (312) is parallel to the end face of the ejector pin (3).

10. An injection molding method, characterized in that, Using any one of the injection molds described in claims 1-9, including: During injection molding, the first gating channel (14) and the second gating channel (22) are interconnected to form a gating channel. The injection protrusion (21) extends into the connecting groove (31). The gating channel is connected to the molding part (11) through the connecting groove (31). The injection plastic passes through the gating channel and the connecting groove (31) in sequence and is injected into the molding part (11). After injection molding is completed, the gate (100) in the gating channel is removed; The slider (2) slides relative to the mold core (1), causing the injection protrusion (21) to be pulled out from the connecting groove (31); A material groove (201) capable of accommodating the injection molding head (21) is formed on the molding residue (200) in the connecting groove (31), and material debris (300) remains at the bottom of the material groove (201); The ejector pin (3) slides relative to the mold core (1), carrying the molding residue (200) and material chips (300) to move and push the molded product (400) away from the molding part (11).

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