Injection molding mold

Abstract

An injection molding mold comprises a first mold component, a mold core, a second mold component, and a transmission mechanism. The mold core is movably embedded in the first mold component. The transmission mechanism is disposed between the mold core and the second mold component, connecting the second mold component and the mold core. The transmission mechanism comprises a first component and a second component, wherein the second component is interlocked with the first component, and one end of the second component interlocking with the first component has a curved surface.

Description

Technical Field

[0001] The present invention relates to a mold, in particular to an injection molding mold. Background Art

[0002] During the release phase of a typical plastic injection molded product, ejector pins are used to eject the finished product from the mold. A conventional injection mold utilizes a core ejection mechanism, connecting the core to a rear mold plate (ejector plate) via a connecting rod (ejector pin), enabling the core to be ejected from the mold.

[0003] Typically, the ejector pins used in the mold core ejection mechanism are integrally formed, with their ends locked to the mold core and the ejector plate. During use, the ejector plate may occasionally tilt or deviate relative to the mold core's surface. Because the mold core is directly connected to the ejector plate, this tilt or deviation can cause deformation in the mold cavity, affecting product yield. Summary of the Invention

[0004] The present invention provides an injection molding die capable of effectively improving product yield.

[0005] An injection molding mold according to the present invention comprises a first mold component, a mold core, a second mold component, and a transmission mechanism. The mold core is movably embedded in the first mold component. The transmission mechanism is disposed between the mold core and the second mold component, connecting the second mold component and the mold core. The transmission mechanism comprises a first component and a second component, wherein the second component is interlocked with the first component, and one end of the second component interlocking with the first component has a curved surface.

[0006] An injection molding mold according to the present invention comprises a first side mold and a second side mold. The first side mold comprises a first template, a second template, and a third template arranged in sequence along a first direction. The first side mold further comprises a first mold core, a first rod-shaped member, and a second rod-shaped member. The first mold core is disposed within the first template. One end of the first rod-shaped member extends through the second template and is connected to the first mold core. One end of the second rod-shaped member is connected to the third template. The other end of the second rod-shaped member includes a curved surface and is connected to the first rod-shaped member. The second side mold comprises a fourth template, which corresponds to the first template.

[0007] Based on the above, compared to the prior art that uses a single connecting rod to connect the mold core and the ejector plate, in an injection molding mold of a specific embodiment of the present invention, two connecting rods with curved point contact are used to connect the mold core and the ejector plate, so that the two connecting rod components can be automatically aligned. This can avoid the tolerance caused by the tilt or offset of the mold plate connected to the ejector rod in the prior art, allowing the mold core to maintain positive movement to push the product out of the mold, thereby improving product yield.

[0008] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, which can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites preferred embodiments and describes them in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of an injection molding device of the present invention.

[0010] Figure 2A yes Figure 1 Schematic diagram of the injection molding mold in the injection molding equipment.

[0011] Figure 2B for Figure 2A Schematic diagram of the second part being pushed by the driving device and then applying force to push the first part to demould the product. DETAILED DESCRIPTION

[0012] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the detailed description of the multiple embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only used with reference to the directions of the accompanying drawings. Therefore, the directional terms used are for illustration and not for limiting the present invention. In addition, the terms "first" and "second" used in the following embodiments are used to identify the same or similar elements and are not used to limit the elements.

[0013] Figure 1 It is a schematic diagram of an injection molding device of the present invention. Figure 2A yes Figure 1 Schematic diagram of the injection molding mold in the injection molding equipment. Please also refer to Figure 1 and Figure 2A In use, the injection molding equipment 1 includes a pushing mechanism 2, an injection molding mold 3 and a feeding nozzle 4.

[0014] The following will be described using one of the feasible embodiments of the present invention, but the present invention is not limited thereto. In this example, the pushing mechanism 2 may include a driving device 21 and a driving plate 22. The driving device 21 may include one or more components such as motors, cylinders, and connecting rods, but is not limited thereto. The feed nozzle 4 is used to inject material into the injection molding mold 3. The injection molding mold 3 includes a first side mold 31 and a second side mold 32. In this embodiment, the first side mold 31 is a movable side mold (so the lower movable side mold uses the label 31 of the first side mold), and the second side mold 32 is a fixed side mold. In this example, the ejection mechanism is only provided on the movable side as an example, but practitioners can refer to the design and freely apply the ejection mechanism of this example to the fixed side of the mold, and the present invention is not limited thereto.

[0015] In this example, the movable mold 31 includes a first mold component 311 , a first mold core 312 , a second mold component 313 and a transmission mechanism 314 .

[0016] In this example, the first mold component 311 includes, starting from the mold surface, a template 3111 and a template 3112. Template 3111 is made of metal (e.g., steel, beryllium copper, aluminum, stainless steel, etc.) and is generally rectangular in shape. Template 3111 has a first through hole 3111a having a first diameter R1 and a second diameter R2, wherein the second diameter R2 is larger than the first diameter R1. In another example, the second diameter R2 can be smaller than the first diameter R1.

[0017] In this example, template 3112 is also made of metal and is roughly rectangular in shape. Template 3112 and template 3111 can have the same or different thicknesses, and the materials of templates 3111 and 3112 can be the same or different. The thickness and materials of templates 3111 and 3112 can vary depending on actual needs. Furthermore, template 3112 has a second through hole 3112a. In this example, first through hole 3111a and second through hole 3112a are connected and can optionally be concentrically arranged.

[0018] In this example, the first mold core 312 is movably embedded in the first mold component 311. In this example, the outer contour of the first mold core 312 is cylindrical, but other shapes, such as a rectangular cylinder, are also possible and are not limited to this invention. The first mold core 312 can be roughly divided into a first section 312a and a second section 312b, wherein the diameter of the first section 312a is smaller than that of the second section 312b. The second section 312b is connected to the first section 312a and forms a shoulder 312c. The material of the first mold core 312 can be selected from alloy steels with high hardness, corrosion resistance, or high temperature resistance.

[0019] In this embodiment, the injection molding die 3 may further optionally include a bushing 315. In this embodiment, the bushing 315 is a ball bushing, and the bushing 315 is sleeved on the outer side of the first mold core 312. In another embodiment, the bushing 315 may be omitted or replaced by a mold plate.

[0020] In this example, the second mold component 313 includes, in order from the mold surface to the opposite direction, a template 3131 and a template 3132. Templates 3131 and 3132 are also made of metal, and the material of templates 3131 and 3132 may be the same as or different from the material of templates 3111 and 3112. In this example, templates 3131 and 3132 each have a through-hole, and the two through-holes are concentrically arranged and connected.

[0021] The thickness of the template 3111, template 3112, template 3131 and template 3132 can be the same or different, according to the actual needs. In this example, the template 3131, template 3132 can be used as an ejector plate, an ejector pin plate or an ejector pin fixing plate, respectively or in combination.

[0022] In this example, the transmission mechanism 314 is disposed between the first mold core 312 and the second mold assembly 313, connecting the second mold assembly 313 and the first mold core 312. The transmission mechanism 314 includes a first component 3141 and a second component 3143. The first component 3141 is rod-shaped and therefore may also be referred to as a first rod-shaped component. The first component 3141 can be roughly divided into three sections along its axial direction A. The diameter of the first section 3141a of the first component 3141 is less than or equal to the diameter of the second section 3141b, which is less than or equal to the diameter of the third section 3141c. The first end of the first component 3141 is located in the first section 3141a and may have external threads. The second end of the first component 3141 is located in the third section 3141c and has a groove 3142. In addition, the first end of the first component 3141 is not limited to having external threads, and may be replaced by other structures or elements with similar functions (such as fasteners).

[0023] The groove 3142 at the second end of the first member 3141 has an inner surface S2. This inner surface S2 can be flat or curved, designed to meet practical needs, so that the inner surface S2 and the spherical surface S1 of the second member 3143 form a point contact. In this example, the shape of the inner surface S2 corresponds to the shape of the curved portion of the second member 3143, but this is not a limitation.

[0024] The second component 3143 is also rod-shaped and can therefore be referred to as a second rod-shaped component. One end 3143a of the second component 3143 has a curved surface S1, which is generally spherical. The other end 3143b of the second component 3143 may have an internal thread. The internal thread may be replaced by other structures or components with similar functions (e.g., fasteners).

[0025] The fixed side mold 32 includes multiple templates, including template 321. Template 321 is similar in shape to the aforementioned templates 3111, 3112, and 3131, also rectangular, and the material of template 321 can be the same as or different from that of templates 3111, 3112, and 3131.

[0026] In addition, the fixed side mold 32 further includes a second mold core 322 , and the second mold core 322 is disposed in the template 321 .

[0027] Please continue to refer to Figure 1 and Figure 2A In the injection molding apparatus 1 employing the injection molding mold 3 of the present invention, a feed nozzle 4 is disposed on one side of a fixed mold plate 32 for supplying material to the mold cavity through the fixed mold 32. During use, the movable mold 31 is disposed on the push mechanism 2 of the injection molding machine and is adapted to be driven by the push mechanism 2 to linearly move in a first direction D1 (parallel to the axial direction A) to move relatively closer to or farther from the fixed mold 32.

[0028] Specifically, the template 3111, template 3112, and template 3131 of the movable mold 31 are sequentially assembled along the first direction D1, wherein the template 3111 and the template 3112 are arranged adjacent to each other, and a gap G is defined between the template 3131 and the template 3112. The template 321 of the fixed mold 32 faces the template 3111 of the movable mold 31.

[0029] In one embodiment, the template 3132 is disposed adjacent to the template 3131 and is located between the template 3131 and the spacing space G.

[0030] The first mold core 312 is movably inserted into the first through hole 3111a of the mold plate 3111. The first section 312a of the first mold core 312 corresponds to the first diameter R1 of the first through hole 3111a, and the second section 312b of the first mold core 312 corresponds to the second diameter R2 of the first through hole 3111a. The shoulder 312c is formed by the changes in the diameter of the first through hole 3111a and the diameter of the first mold core 312.

[0031] The first member 3141 passes through the second through hole 3112a of the template 3112 and into the first through hole 3111a of the template 3111. The first end of the first member 3141, which has an external thread, is locked into the second section 312b of the first mold core 312. The second section 3141b of the first member 3141 is located in the second through hole 3112a of the template 3112, while the third section 3141c of the first member 3141 is located outside the template 3112 and faces the template 3131. The external thread on the first end may alternatively be replaced with other structures or elements having similar effects (e.g., fasteners).

[0032] The third end 3143a of the second member 3143 is positioned within the recess 3142 at the second end of the first member 3141. A curved surface S1 formed on the third end 3143a of the second member 3143 contacts an inner surface S2 of the recess 3142 at the second end of the first member 3141. In this embodiment, the inner surface S2 of the recess 3142 is a curved surface, optionally a spherical surface with a greater radius of curvature than the radius of curvature of the curved surface S1. However, in other embodiments, the inner surface S2 may alternatively be a flat surface.

[0033] Since the third end 3143 a of the second mechanism 3143 is configured as the curved surface S1 , the curved surface S1 is in point contact with the inner surface S2 of the groove 3142 .

[0034] One end 3143b of the second component 3143 is positioned within the mold plate 3131. The injection molding mold 3 further includes a fastener 316. In this example, the fastener 316 can optionally be a screw. The fastener 316 enters the through hole of the mold plate 3131 from the left side of the figure and screws into the internal thread of the one end 3143b of the second component 3143. The internal thread of the one end 3143b of the second component 3143 can alternatively be replaced with other fixing means, such as a fastener, for example.

[0035] In this example, there is a distance between the first mold component 311 and the second mold component 313. That is, there is a gap G between the template 3112 and the template 3131. The second component 3143 and the first component 3141 are interlocked within this gap G, so the component 3143 can rotate relative to the component 3141 to a certain extent.

[0036] Figure 2B for Figure 2A Schematic diagram of the second part being pushed by the driving device and then applying force to push the first part to demould the product, wherein Figure 2A The diagram shows that the pushing mechanism 2 has not yet pushed the movable side mold 31, and Figure 2B The schematic diagram shows that the pushing mechanism 2 pushes the movable side mold 31 to demould the product 5. Figure 1 、 Figure 2A and Figure 2B , push mechanism 2 towards Figure 2A and Figure 2B The movable mold 31 is pushed to the right (i.e., opposite to the first direction D1) to close the movable mold 31 with the fixed mold to form a mold cavity. The feed nozzle 4 can also inject the molten material into the mold cavity between the mold cores through the flow channel of the fixed mold plate.

[0037] After a predetermined amount of material is injected into the mold cavity, the feed nozzle 4 stops injecting the material and cools the material in the mold cavity to form a product 5.

[0038] Next, the pushing mechanism 2 drives the movable mold 31 to move relatively away from the fixed mold 32. At this time, the molded product 5 is located within the first diameter R1 of the first through hole 3111a of the template 3111.

[0039] Please also refer to Figure 1 and Figure 2B The template 3131 contacts the drive plate 22 of the sliding mechanism 2, and the drive plate 22 is pushed by the drive device 21, wherein the drive device 21 can be a combination of a cylinder and a connecting rod, but is not limited to this. It can also be a combination of a motor and a connecting rod. The drive device 21 drives the drive plate 22 to move linearly in the first direction D1 to drive the template 3131. The drive device 21 pushes the drive plate 22 in the opposite direction of the first direction D1 to push the template 3131 toward the template 3112, thereby causing the second part 3143 fixed in the template 3131 to apply force to push the first part 3141, and the first mold core 312 locked to the first part 3141 moves in the opposite direction of the first direction D1. It should be noted that in this example, the second part 3143 pushes the first part 3141 through point contact at the top of the curved surface, rather than using other surfaces of the second part 3143 to push.

[0040] As mentioned above, the conventional ejector pin has its two ends locked to the mold core and the ejector plate respectively, which can easily cause the mold core and the ejector plate to flip or shift relative to each other due to the tolerances among the ejector pin, the mold core and the ejector plate. However, in this embodiment, the ejector pin is disassembled into two rod-shaped parts for processing. Therefore, the processing accuracy of the first part 3141 and the second part 3143 is relatively easy to control, which can reduce assembly problems caused by tolerances.

[0041] Specifically, the third end 3143a of the second member 3143 is designed as a curved surface S1, so that the curved surface S1 contacts the inner surface S2 of the recess 3142 in point contact. Therefore, when the second member 3143 is pushed by the driving device 21 and applies force to push against the first member 3141, the curved surface S1 contacts the inner surface S2 of the recess 3142 in point contact. Simply put, the second member 3143 pushes against the first member 3141 through point contact with its curved surface, rather than through surface contact with other flat surfaces of the second member 3143. Therefore, when the second member 3143 pushes against the first member 3141, it automatically aligns with the first member 3141, correcting any relative offset or tilt between the mold plate 3131 and the first mold core 312. This allows the first mold core 312 to eject the product 5 at the correct angle and position. In this example, the depth of the groove 3142 is slightly higher than the height of the curved surface of the first component 3141 . However, in another example, the depth of the groove 3142 may be substantially the same, and the present invention is not limited thereto.

[0042] In summary, the injection molding die of the present invention has at least the following advantages:

[0043] 1. Disassembling the ejector pin into two parts for processing can significantly reduce the processing length of the parts and effectively improve the processing accuracy and cylindricity of the end face of the parts;

[0044] Second, the curved end fastener of the second component fits into the groove of the first component. Because the curved surface makes point contact with the inner surface of the groove, it can achieve automatic centering and correct relative offset or flipping between the template and the mold core, allowing the mold core to eject the product at the correct angle and position, thereby improving product yield.

[0045] 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, it is not intended to limit the present invention. Any technician familiar with the present profession can make slight changes or modifications to equivalent embodiments of equivalent changes using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple 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. An injection molding die, characterized in that: include: a first mold component; a mold core movably embedded in the first component of the mold; a second mold component; and A transmission mechanism is provided between the mold core and the second mold component, connecting the second mold component and the mold core. The transmission mechanism includes a first component and a second component. One end of the second component having a curved surface is buckled with the first component. When the second component moves along a first direction, the second component pushes the first component to move along the first direction through point contact with the curved surface and automatically aligns with the first component.

2. The injection molding die according to claim 1, wherein: The first component of the transmission mechanism is a first rod-shaped component, the second component is a second rod-shaped component, the mold core is a first mold core, the first mold component includes a first template and a second template arranged in sequence along the first direction, and the second mold component is a third template.

3. The injection molding die according to claim 2, wherein: The curved surface of the second rod-shaped member is a spherical surface, and the second rod-shaped member is in point contact with the first rod-shaped member via the spherical surface.

4. The injection molding die according to claim 2, wherein: There is a space between the second template and the third template, and the buckling position of the second rod-shaped member and the first rod-shaped member is located in the space between the second template and the third template.

5. The injection molding die according to claim 2, wherein: The first mold core has a shoulder portion that interferes with the first mold plate to limit the moving distance of the first mold core.

6. The injection molding die according to claim 2, wherein: The injection molding die further includes a bushing which is sleeved between the first mold core and the first mold plate.

7. The injection molding die according to claim 2, wherein: The end of the first rod-shaped member connected to the first mold has an external thread and is locked in the first mold, while the other end of the first rod-shaped member protrudes outside the second mold plate and has a groove, and the end of the second rod-shaped member with the curved surface is accommodated in the groove.

8. The injection molding die according to claim 7, wherein: The groove has a surface facing the curved surface, the surface is a plane or an arc surface, and the curved surface of the second rod-shaped component is a spherical surface.

9. The injection molding die according to claim 8, wherein: The curvature radius of the arc surface is greater than the curvature radius of the spherical surface.

10. An injection molding die, characterized in that: It includes a first side mold and a second side mold: The first side mold includes a first template, a second template and a third template arranged in sequence along a first direction; The first side mold further includes a first mold core, a first rod-shaped component, and a second rod-shaped component: The first mold core is arranged in the first template; One end of the first rod-shaped member passes through the second mold plate and is connected to the first mold core; and The end of the second rod-shaped member without a curved surface is connected to the third template, and the end of the second rod-shaped member with a curved surface is connected to the first rod-shaped member. When the second rod-shaped member moves in the first direction, the second rod-shaped member pushes the first rod-shaped member to move in the first direction through point contact with the curved surface, and the second rod-shaped member automatically aligns with the first rod-shaped member. The second side mold includes a fourth template, and the fourth template corresponds to the first template.

11. The injection molding die according to claim 10, wherein: The curved surface of the second rod-shaped member is a spherical surface, and the second rod-shaped member is in point contact with the first rod-shaped member via the spherical surface.

12. The injection molding die according to claim 10, wherein: There is a space between the second template and the third template, and the buckling position of the second rod-shaped member and the first rod-shaped member is located in the space between the second template and the third template.

13. The injection molding die according to claim 10, wherein: The first mold core has a shoulder portion that interferes with the first mold plate to limit the moving distance of the first mold core.

14. The injection molding die according to claim 10, wherein: The injection molding die further includes a bushing which is sleeved between the first mold core and the first mold plate.

15. The injection molding die according to claim 10, wherein: The end of the first rod-shaped member connected to the first mold has an external thread and is locked in the first mold, while the other end of the first rod-shaped member protrudes outside the second mold plate and has a groove, and the end of the second rod-shaped member with the curved surface is accommodated in the groove.

16. The injection molding die according to claim 15, wherein: The groove has a surface facing the curved surface, the surface is a plane or an arc surface, and the curved surface of the second rod-shaped component is a spherical surface.

17. The injection molding die according to claim 16, wherein: The curvature radius of the arc surface is greater than the curvature radius of the spherical surface.

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