Rapid forming die for ultra-precise parts

Abstract

The utility model provides an ultra-precision part rapid forming die, which comprises an upper die, a material injection port and forming cavities, the top of the upper die is fixedly connected with the material injection port, the bottom of the upper die is provided with a plurality of forming cavities, and the material injection port is communicated with the forming cavities after shunting; a middle layer and a lower die are arranged below the upper die in a die assembly mode, and guide columns are fixedly connected to the four corners of the top face of the lower die. The shaping plug has the advantages that the flatness of the bottom of a product can be guaranteed, the problems of unevenness, depression and the like possibly caused by factors such as raw material flowing and cooling shrinkage at the bottom of the product can be solved by rotating the shaping plug, and the bottom of the product is more flat and smoother and meets design requirements. As for the product needing to be tightly matched with other parts, the shape of the bottom of the product can be accurately shaped through rotary shaping of the shaping plug, the matching precision of the bottom of the product and the other parts is ensured, and the assembling performance and the use reliability of the product are improved.

Description

Technical Field

[0001] This utility model relates to the field of precision mold technology, and in particular to rapid prototyping molds for ultra-precision parts. Background Technology

[0002] Injection molds are the core tools in the production of plastic products. By injecting molten plastic into the mold cavity and cooling and solidifying it, the efficient mass production of complex-shaped parts can be achieved.

[0003] In the field of precision parts manufacturing, the precision and efficiency of rapid prototyping molds directly affect product yield and production costs. In existing technologies, traditional injection molds generally face technical bottlenecks for complex structural parts with micron-level tolerance requirements (such as micro gearbox housings and optical connectors): the geometric accuracy of the bottom of the molded part is insufficient to meet high-precision fitting requirements. Therefore, ultra-precision rapid prototyping molds are proposed to solve these problems. They can eliminate unevenness and depressions on the bottom of the product that may be caused by raw material flow, cooling shrinkage, etc., making the bottom of the product flatter and smoother, meeting design requirements; at the same time, they ensure the fitting accuracy of the bottom of the product with other components, improving the assembly performance and reliability of the product. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0005] Therefore, one objective of this utility model is to propose a rapid prototyping mold for ultra-precision parts, so as to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0006] To achieve the above objectives, one embodiment of the present invention provides a rapid prototyping mold for ultra-precision parts, including an upper mold, an injection port, and a molding cavity. The top of the upper mold is fixedly connected to the injection port, and the bottom of the upper mold has a plurality of molding cavities. The injection port is connected to the molding cavity after being diverted.

[0007] The upper mold has a middle layer and a lower mold below it. Guide pillars are fixedly connected to the four corners of the top surface of the lower mold. The outer surface of the guide pillars is movably connected to the middle layer and the outer surface of the guide pillars is movably connected to the upper mold.

[0008] A spring is fixedly connected between the bottom of the middle layer and the top surface of the lower mold. Several reserved sleeves are installed on the middle layer. The upper part of the reserved sleeves is connected to the molding cavity. A shaping plug is movably connected in the reserved sleeve.

[0009] A cylinder is fixedly connected to the side of the lower mold, and a rack is fixedly connected to the output end of the cylinder. The rack is movably connected inside the lower mold.

[0010] A main gear is movably connected to one side of the rack, and another main gear is coaxially connected above the main gear. Several secondary gears are movably connected around the main gear. A main shaft is fixedly connected above the secondary gears. The top end of the main shaft is fixedly connected to the shaping plug. The main shaft is movably connected to the lower mold.

[0011] Preferably, the upper mold, middle layer, and lower mold are made of cast iron, and the injection port has four branch ports that are connected to the four forming cavities.

[0012] By adopting the above technical solution, the parts in this mold can be formed quickly and with precision.

[0013] The basic working process of this mold is as follows: the upper mold is pressed down to close the mold, the spring is compressed, the middle layer, the upper mold, and the lower mold are closed as a whole. At this time, the forming cavity is connected to the reserved sleeve of the middle layer, the shaping plug enters the reserved sleeve and seals the top opening of the reserved sleeve.

[0014] Molten raw material is injected through the injection port, and after being diverted, it enters the molding cavity to form the product. After initial molding, the output end of the cylinder pushes out, the rack moves, and drives the main gear to rotate. The main gear drives all the auxiliary gears and shaping plugs to rotate, shaping the bottom of the product inside the molding cavity, and then the product is formed.

[0015] This ensures the flatness of the bottom: by rotating the shaping plug, unevenness and depressions that may occur at the bottom of the product due to factors such as raw material flow and cooling contraction can be eliminated, making the bottom of the product flatter and smoother, and meeting the design requirements.

[0016] Optimize bottom shape accuracy: For products that need to fit closely with other components, the rotational shaping of the shaping plug can accurately shape the bottom of the product, ensuring the fit accuracy between the bottom of the product and other components, and improving the assembly performance and reliability of the product.

[0017] Preferably, in any of the above solutions, the middle layer is adjustable in height, and the reserved sleeve is welded to the middle layer.

[0018] The above technical solution is adopted, and the mold structure consists of: Upper mold: Four injection ports are fixed at the top, and four molding cavities are opened at the bottom. The injection ports are connected to each molding cavity after being diverted. Middle layer: Located between the upper and lower molds, it is vertically guided by guide pillars; multiple sets of springs are welded between the bottom of the middle layer and the top surface of the lower mold, allowing the middle layer to elastically compress during mold closing. Several through-hole pre-reserved sleeves are welded onto the middle layer, with ceramic sealing rings installed at their top openings. Conical ceramic shaping plugs (small end facing upwards) are movably connected inside the pre-reserved sleeves. Lower mold: Guide pillars are fixed at the four corners, penetrating the middle layer and the upper mold to ensure mold closing accuracy. A cylinder is horizontally mounted on the side of the lower mold, and the cylinder output end is connected to a rack; the rack meshes with two sets of coaxial main gears, and the main gears mesh with multiple auxiliary gears circumferentially. The top of the auxiliary gears is fixed to the main shaft, and the top of the main shaft is connected to the shaping plug and movably connected to the lower mold.

[0019] Preferably, in any of the above embodiments, the reserved sleeve is open from top to bottom, and a ceramic sealing ring is fixedly connected to the top opening of the reserved sleeve.

[0020] The working principle of this mold is as follows: During the mold closing stage, the upper mold presses down, the middle layer is pressed upward by the spring, and the guide pillars ensure precise alignment of the three molds. After the mold closes, the forming cavity aligns with the pre-reserved sleeve, and the conical head at the top of the shaping plug is inserted into the top opening of the pre-reserved sleeve to achieve a seal.

[0021] Injection molding: Molten material is injected into the molding cavity through the injection port, and after filling, it initially solidifies to form a product.

[0022] Rotary shaping: The cylinder pushes the rack to move horizontally, driving the main gear and the auxiliary gear to rotate, which in turn drives the main shaft and the shaping plug to rotate synchronously. The ceramic conical surface of the shaping plug applies pressure and grinds the bottom of the product, eliminating dents or unevenness caused by cooling shrinkage, and precisely shaping the bottom.

[0023] Demolding and part removal: The cylinder resets, the gear system rotates in the opposite direction to detach the shaping plug from the product, and the finished product is removed after the mold is opened.

[0024] Preferably, the shaping plug is made of ceramic and is a cone with the smaller end facing upwards, as described in any of the above embodiments.

[0025] The core design of this mold: Bottom flatness guarantee: The rotation of the shaping plug effectively offsets uneven material flow and cooling deformation, making the bottom of the product mirror-smooth and reducing the need for subsequent processing.

[0026] Shape accuracy optimization: The rotation trajectory of the conical shaping plug can accurately match the design curve, ensuring small geometric tolerances at the bottom of the product. It is suitable for high-precision assembly scenarios, and the products formed by this mold are high-precision products.

[0027] Preferably, in any of the above embodiments, the cylinder is installed horizontally, and the rack can drive all the main gears, auxiliary gears, and shaping plugs to rotate when it is in motion.

[0028] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0029] This ultra-precision rapid prototyping mold, after initial forming, ejects from the cylinder output end, moves the rack, and drives the main gear to rotate. The main gear then drives all the secondary gears and shaping plugs to rotate, shaping the bottom of the product inside the forming cavity before final forming. This ensures the flatness of the product bottom: by rotating the shaping plug, it can eliminate unevenness and depressions that may occur at the bottom of the product due to factors such as raw material flow and cooling contraction, making the bottom of the product flatter and smoother, meeting design requirements.

[0030] Optimize bottom shape accuracy: For products that need to fit closely with other components, the rotational shaping of the shaping plug can accurately shape the bottom of the product, ensuring the fit accuracy between the bottom of the product and other components, and improving the assembly performance and reliability of the product.

[0031] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0033] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0034] Figure 2 This is a structural schematic diagram of the present invention from a second perspective;

[0035] Figure 3 This is a structural schematic diagram of the present invention from a third-view perspective;

[0036] Figure 4 This is a partial structural diagram of the lower mold of this utility model.

[0037] In the diagram: 1-Upper mold, 2-Injection port, 3-Molding cavity, 4-Middle layer, 5-Lower mold, 6-Guide post, 7-Spring, 8-Pre-reserved sleeve, 9-Shaping plug, 10-Cylinder, 11-Rack and pinion, 12-Main gear, 13-Secondary gear, 14-Main shaft. Detailed Implementation

[0038] The embodiments of this utility model 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 elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] like Figure 1-4 As shown, this ultra-precision rapid prototyping mold for parts includes an upper mold 1, an injection port 2, and a molding cavity 3. The top of the upper mold 1 is fixedly connected to the injection port 2, and the bottom of the upper mold 1 has several molding cavities 3. The injection port 2 is connected to the molding cavity 3 after being diverted.

[0041] The lower part of the upper mold 1 has a middle layer 4 and a lower mold 5. The four corners of the top surface of the lower mold 5 are fixedly connected to guide pillars 6. The outer surface of the guide pillars 6 is movably connected to the middle layer 4 and the outer surface of the guide pillars 6 is movably connected to the upper mold 1.

[0042] A spring 7 is fixedly connected between the bottom of the middle layer 4 and the top surface of the lower mold 5. Several reserved sleeves 8 are installed on the middle layer 4. The upper part of the reserved sleeves 8 is connected to the molding cavity 3. A shaping plug 9 is movably connected in the reserved sleeves 8.

[0043] A cylinder 10 is fixedly connected to the side of the lower mold 5, and a rack 11 is fixedly connected to the output end of the cylinder 10. The rack 11 is movably connected inside the lower mold 5.

[0044] A main gear 12 is movably connected to one side of the rack 11. Another main gear 12 is coaxially connected above the main gear 12. Several secondary gears 13 are movably connected around the main gear 12. A main shaft 14 is fixedly connected above the secondary gears 13. The top end of the main shaft 14 is fixedly connected to the shaping plug 9. The main shaft 14 is movably connected to the lower mold 5.

[0045] Example 1: The upper mold 1, middle layer 4, and lower mold 5 are made of cast iron. The injection port 2 has four branch ports that are connected to the four forming cavities 3. The parts in this mold can be formed quickly and with precision.

[0046] The basic working process of this mold is as follows: the upper mold 1 is pressed down to close the mold, the spring 7 is compressed, the middle layer 4, the upper mold 1, and the lower mold 5 are closed as a whole. At this time, the forming cavity 3 is connected to the reserved sleeve 8 of the middle layer 4, and the shaping plug 9 enters the reserved sleeve 8 and seals the top opening of the reserved sleeve 8.

[0047] Molten raw material is injected through injection port 2, and after being diverted, it enters the molding cavity 3 for product forming. After initial forming, the output end of cylinder 10 pushes out, the rack 11 moves, driving the main gear 12 to rotate. The main gear 12 drives all the auxiliary gears 13 and the shaping plug 9 to rotate, shaping the bottom of the product inside the molding cavity 3, and then the product is formed. The middle layer 4 is liftable, and the reserved sleeve 8 is welded to the middle layer 4. The reserved sleeve 8 is vertically continuous, and a ceramic sealing ring is fixedly connected to the top opening of the reserved sleeve 8. The shaping plug 9 is made of ceramic and is a cone with the small end facing upwards. Cylinder 10 is installed horizontally, and when the rack moves, it can drive all the main gears 12, auxiliary gears 13, and shaping plug 9 to rotate.

[0048] Example 2: Structural composition of this mold: Upper mold 1: Four injection ports 2 are fixed at the top, and four molding cavities 3 are opened at the bottom. The injection ports 2 are connected to each molding cavity 3 after being diverted. Middle layer 4: Located between the upper mold 1 and the lower mold 5, it is vertically guided by guide pillars 6; multiple sets of springs 7 are welded between the bottom of the middle layer 4 and the top surface of the lower mold 5, allowing the middle layer 4 to be elastically compressed when the mold is closed. Several vertically penetrating reserved sleeves 8 are welded on the middle layer 4, and ceramic sealing rings are installed at their top openings. Conical ceramic shaping plugs 9 (small end facing up) are movably connected inside the reserved sleeves 8. Lower mold 5: Guide pillars 6 are fixed at the four corners, and the guide pillars 6 penetrate the middle layer 4 and the upper mold 1 to ensure the mold closing accuracy. A cylinder 10 is horizontally mounted on the side of the lower mold 5, and the output end of the cylinder 10 is connected to a rack 11. The rack 11 meshes with two sets of coaxial main gears 12, and the main gears 12 mesh with multiple auxiliary gears 13 in a circumferential direction. The top of the auxiliary gears 13 is fixed to the main shaft 14, and the top of the main shaft 14 is connected to the shaping plug 9 and is movably connected to the lower mold 5.

[0049] Core design of this mold: Bottom flatness guarantee: The rotation of the shaping plug 9 effectively counteracts uneven material flow and cooling deformation, making the bottom of the product mirror-smooth and reducing the need for subsequent processing.

[0050] Shape accuracy optimization: The rotation trajectory of the conical shaping plug 9 can accurately match the design curve, ensuring small geometric tolerances at the bottom of the product, making it suitable for high-precision assembly scenarios. The products formed by this mold are high-precision products.

[0051] The working principle of this utility model is as follows:

[0052] During the mold closing stage: the upper mold 1 is pressed down, the middle layer 4 is pressed upward by the spring 7, and the guide post 6 ensures precise alignment of the three molds. After the mold is closed, the molding cavity 3 is connected to the reserved sleeve 8, and the conical head of the shaping plug 9 is inserted into the top opening of the reserved sleeve 8 to achieve a seal.

[0053] Injection molding: Molten material is injected into molding cavity 3 through injection port 2, and after filling, it is initially solidified to form the product.

[0054] Rotary shaping: Cylinder 10 pushes rack 11 to move horizontally, driving main gear 12 and secondary gear 13 to rotate, which in turn drives main shaft 14 and shaping plug 9 to rotate synchronously. The ceramic conical surface of shaping plug 9 applies pressure and grinds the bottom of the product, eliminating dents or unevenness caused by cooling shrinkage, and precisely shaping the bottom.

[0055] Demolding and part removal: Cylinder 10 is reset, the gear system rotates in the opposite direction to make the shaping plug 9 disengage from the product, and the finished product is taken out after the mold is opened.

[0056] Compared with the prior art, the present invention has the following advantages:

[0057] This ultra-precision rapid prototyping mold can ensure the flatness of the product bottom: by rotating the shaping plug 9, it can eliminate problems such as unevenness and depressions that may occur at the bottom of the product due to factors such as raw material flow and cooling shrinkage, making the bottom of the product flatter and smoother, and meeting the design requirements.

[0058] Optimize bottom shape accuracy: For products that need to fit closely with other components, the rotational shaping of the shaping plug 9 can accurately shape the bottom of the product, ensuring the fit accuracy between the bottom of the product and other components, and improving the assembly performance and reliability of the product.

Claims

1. A rapid prototyping mold for ultra-precision parts, characterized in that, It includes an upper mold (1), an injection port (2), and a molding cavity (3). The top of the upper mold (1) is fixedly connected to the injection port (2), and the bottom of the upper mold (1) is provided with several molding cavities (3). The injection port (2) is connected to the molding cavity (3) after the flow is diverted. The upper mold (1) has a middle layer (4) and a lower mold (5) below it. The four corners of the top surface of the lower mold (5) are fixedly connected to guide pillars (6). The outer surface of the guide pillars (6) is movably connected to the middle layer (4), and the outer surface of the guide pillars (6) is movably connected to the upper mold (1). A spring (7) is fixedly connected between the bottom of the middle layer (4) and the top surface of the lower mold (5). Several reserved sleeves (8) are installed on the middle layer (4). The upper part of the reserved sleeves (8) is connected to the molding cavity (3). A shaping plug (9) is movably connected in the reserved sleeves (8). A cylinder (10) is fixedly connected to the side of the lower mold (5), and a rack (11) is fixedly connected to the output end of the cylinder (10). The rack (11) is movably connected inside the lower mold (5). A main gear (12) is movably connected to one side of the rack (11), and another main gear (12) is coaxially connected above the main gear (12). Several auxiliary gears (13) are movably connected around the main gear (12). A main shaft (14) is fixedly connected above the auxiliary gears (13). The top end of the main shaft (14) is fixedly connected to the shaping plug (9), and the main shaft (14) is movably connected to the lower mold (5).

2. The rapid prototyping mold for ultra-precision parts as described in claim 1, characterized in that: The upper mold (1), middle layer (4), and lower mold (5) are made of cast iron. The injection port (2) has four branch ports and is connected to the four forming cavities (3) one by one.

3. The rapid prototyping mold for ultra-precision parts as described in claim 2, characterized in that: The middle layer (4) is adjustable in height, and the reserved sleeve (8) is welded to the middle layer (4).

4. The rapid prototyping mold for ultra-precision parts as described in claim 3, characterized in that: The reserved sleeve (8) is open from top to bottom, and a ceramic sealing ring is fixedly connected to the top opening of the reserved sleeve (8).

5. The rapid prototyping mold for ultra-precision parts as described in claim 4, characterized in that: The shaping plug (9) is made of ceramic and is a cone with the small end facing upward.

6. The rapid prototyping mold for ultra-precision parts as described in claim 5, characterized in that: The cylinder (10) is installed horizontally, and when the rack is in motion, it can drive all the main gears (12), auxiliary gears (13), and shaping plugs (9) to rotate.

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