Polymer-based wear-resistant lubricating material injection shear test piece manufacturing mold

Abstract

The invention relates to a manufacturing mold for a polymer-based wear-resistant lubricating material injection shear test piece. The manufacturing mold comprises an upper mold, a middle mold and a lower mold, assembling the middle mold into the test piece groove of the lower mold according to the mode that the test piece round hole is on the left, combining the upper mold according to the mode that injection molding openings are aligned, inserting a test piece round hole positioning pin, carrying out injection molding from right to left, opening the upper mold after injection molding is completed, and integrally taking out the middle mold and the injection molding sample strip from the position of the piece taking groove by using a tool; the whole is used for shear strength testing. According to the invention, the injection shear strength data can be simply and effectively obtained, the mold can flexibly carry out shear performance test and optimization test according to design requirements, and the related research and development cost is remarkably reduced.

Description

Technical Field

[0001] This invention relates to the fields of lubrication and injection molding technology, specifically to a mold for manufacturing injection shear specimens of polymer-based wear-resistant lubricating materials. Background Technology

[0002] Polymer-based lubricants are ideal self-lubricating materials that can replace lubricating oils, such as polyetheretherketone (PEEK), polyimide (PI), and epoxy resins. They are widely used in aerospace, chemical, medical, automotive, and electronics industries.

[0003] The matrix of polymer-based lubricating materials is mostly resin (plastic), and the most suitable molding method is injection molding. This method has the advantages of high production efficiency, good dimensional accuracy and wide material adaptability. Therefore, injection molding is mostly used for parts with wear-resistant lubrication requirements, such as automotive and rail transportation components, general machinery and equipment components, and special working condition components.

[0004] Besides considering the lubrication performance of materials, the adhesion of materials to lubrication-required areas, i.e., shear strength, is also a key consideration in the design. If lubricating material detaches from the lubricated surface, lubrication failure will occur, potentially leading to equipment damage. Therefore, obtaining shear strength data is particularly important when attaching polymer-based lubricating materials to lubrication-required areas via injection molding.

[0005] However, the current method of determining whether the final product meets the design requirements is mainly by directly testing the shear strength of the final product. For products with large volume and complex structure that are still in the design stage, if the requirements are not met, the corresponding molds will be scrapped, which will result in a certain waste of resources and is not conducive to conducting experiments to optimize shear performance. It is also inflexible. There is an urgent need to develop a simple, effective method to obtain injection molding shear strength data more scientifically. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention proposes a mold for fabricating injection molding shear test specimens of polymer-based wear-resistant lubricating materials. This solves the current method of determining whether design requirements are met primarily by directly testing the shear strength of the final product. For products with large volumes and complex structures in the design stage, if the requirements are not met, the corresponding molds become unusable, resulting in resource waste. This new mold can simply and effectively obtain injection molding shear strength data. Furthermore, it allows for flexible shear performance testing and optimization experiments based on design needs, significantly reducing related R&D costs.

[0007] To address the aforementioned technical problems, one objective of this invention is to provide a mold for manufacturing injection-molded shear specimens of polymer-based wear-resistant and lubricating materials, comprising: Upper mold 1, the upper mold includes a specimen round hole positioning pin 101, a specimen round hole positioning hole 102, an upper mold fixing screw hole one 103, an upper mold fixing screw hole two 104, an upper mold positioning hole one 105, an upper mold positioning hole two 106 and an upper injection port 107. The intermediate mold 2 includes a keyway 201 and a circular hole 202 for the specimen; The lower mold 3 includes a specimen groove 301, a part taking groove 302, a first fixing screw hole 303, a second fixing screw hole 304, a first positioning pin hole 305, a second positioning pin hole 306, and a lower injection port 307. The middle mold 2 is embedded in the lower mold specimen groove 301, and the upper mold 1 and the lower mold 3 are closed and fixed by fixing bolts and positioning pins.

[0008] Furthermore, the depth of the circular hole 202 of the middle mold 2 is the same as the depth of the groove 301 of the lower mold 3, and the length and width of the middle mold 2 are the same as the groove 301 of the mold 3, ensuring that the middle mold 2 can be embedded into the groove 301 of the lower mold 3.

[0009] Furthermore, the shape of the keyway 201 of the intermediate mold includes, but is not limited to, any combination of one or more of the following: straight keyway, dovetail keyway, corrugated keyway, array keyway, or other shaped keyways. The slotting position is either through the keyway area or located at any position in the keyway area. The slotting direction includes, but is not limited to, any direction parallel to the surface of the intermediate mold 2. The area of ​​the slotting region includes, but is not limited to, other dimensions of 2cm × 2cm. The slotting depth includes, but is not limited to, other values ​​other than 1~3mm.

[0010] Furthermore, the length of the positioning pin 101 for the specimen hole of the upper mold 1 should be equal to the sum of the thickness of the upper mold 1 and the depth of the specimen groove 301 of the lower mold 3, and the pin head of the positioning pin 101 for the specimen hole should be located at the center line 5-8 mm away from the right end of the specimen groove 301.

[0011] Furthermore, the lower mold 3 part-taking groove 302 is located to the left of the test piece groove 301, the groove area is 10mm×10mm, and the groove depth is 8~12mm.

[0012] Furthermore, the lower mold 3 specimen groove 301 has an area of ​​8cm×2cm and a depth of 6~10mm.

[0013] Furthermore, the test specimen round hole 202 of the middle mold 2 is located at the center line of the test specimen groove 301 of the lower mold 3, which is 5-8 mm from the left end, and the diameter of the test specimen round hole 202 and the test specimen round hole positioning pin 101 is 5-8 mm.

[0014] Furthermore, the upper injection port 107 and the lower injection port 307, when combined, form a conical surface with a depth of 3.5~5.5mm and an flaring angle of 75~83°, located on the right end face of the upper and lower molds, with its center line located 35~40mm from the rear end face of the upper and lower molds.

[0015] Furthermore, the center lines of the lower mold, including the test piece groove 301 and the take-out groove 302, coincide with the center lines of the upper injection port 107 and the lower injection port 307.

[0016] Furthermore, the mold is used as follows: the middle mold 2 is assembled into the specimen slot 301 of the lower mold 3 with the specimen hole 202 on the left, the upper mold 1 is assembled with the injection port aligned, the specimen hole positioning pin 101 is inserted, and injection molding is performed from right to left. After injection molding is completed, the upper mold is opened, and the middle mold 2 and the injection-molded specimen are taken out as a whole from the part removal slot 302 position using a tool. This whole is used for shear strength testing.

[0017] The present invention provides at least one or more of the following technical effects: The present invention designs a replaceable intermediate mold, which directly participates in shear performance testing as part of the shear test specimen. By changing the material type and keyway region structure of the intermediate mold, the injection molding shear performance between polymer-based wear-resistant lubricating materials and metal materials can be effectively obtained. The mold of the present invention is flexible and compact, offering significant advantages in saving raw materials and reducing mold costs, and providing users with broader injection molding ideas.

[0018] The ingenious design of the mold in this invention is that, in addition to obtaining the injection shear properties between polymer-based wear-resistant lubricating materials and metal materials, it can also obtain the shear properties between different polymer-based wear-resistant lubricating materials. Attached Figure Description

[0019] Figure 1 : Schematic diagram of the mold structure for manufacturing injection-molded shear specimens according to the present invention; Figure 2 : Schematic diagram of the mold structure of this invention; Figure 3 : Schematic diagram of the mold structure in this invention; Figure 4 : Schematic diagram of the mold structure of this invention; Wherein: 1-Upper mold, 101-Sample round hole positioning pin, 102-Sample round hole positioning hole, 103-Upper mold fixing screw hole one, 104-Upper mold fixing screw hole two, 105-Upper mold positioning hole one, 106-Upper mold positioning hole two, 107-Upper injection port, 2-Middle mold, 201-Middle mold including keyway, 202-Sample round hole, 3-Lower mold, 301-Sample groove, 302-Part removal groove, 303-Lower mold fixing screw hole one, 304-Lower mold fixing screw hole two, 305-Lower mold positioning pin hole one, 306-Lower mold positioning pin hole two, 307-Lower injection port. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments obtained. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0021] Example 1 A mold for manufacturing injection shear specimens of polymer-based wear-resistant lubricating material includes an upper mold 1, a middle mold 2, and a lower mold 3.

[0022] The upper mold includes a specimen round hole positioning pin 101, a specimen round hole positioning hole 102, an upper mold fixing screw hole one 103, an upper mold fixing screw hole two 104, an upper mold positioning hole one 105, an upper mold positioning hole two 106 and an upper injection port 107. The intermediate mold includes a keyway 201 and a circular hole 202 in the specimen; The lower mold includes a specimen slot 301, a part taking slot 302, a first fixing screw hole 303, a second fixing screw hole 304, a first positioning pin hole 305, a second positioning pin hole 306, and a lower injection port 307. The depth of the circular hole 202 of the middle mold 2 is the same as the depth of the groove 301 of the lower mold 3, and the length and width of the middle mold 2 are the same as the groove 301 of the mold 3, so as to ensure that the middle mold 2 can be embedded in the groove 301 of the lower mold 3. The keyway 201 of the middle mold is a straight keyway with a groove area of ​​2cm×2cm and a groove depth of 3mm. The length of the positioning pin 101 for the round hole of the upper mold 1 should be equal to the sum of the thickness of the upper mold 1 and the depth of the groove 301 of the lower mold 3. The pin head of the positioning pin 101 for the round hole of the specimen is located at the center line 8mm away from the right end of the groove 301 of the specimen. The lower mold 3 part taking groove 302 is located on the left side of the test piece groove 301, the groove area is 10mm×10mm, and the groove depth is 8mm; The lower mold 3 specimen groove 301 has an area of ​​8cm × 2cm and a depth of 6mm; The upper injection port 107 and the lower injection port 307, when combined, form a conical surface with a depth of 5.5 mm and an flaring angle of 80°, located on the right end face of the upper and lower molds, with its center line located 35 mm from the rear end face of the upper and lower molds. The centerline of the lower mold, including the test piece groove 301 and the take-out groove 302, coincides with the centerline of the upper injection port 107 and the lower injection port 307.

[0023] The mold is used as follows: Assemble the middle mold 2 into the specimen slot 301 of the lower mold 3 with the specimen hole 202 on the left. Assemble the upper mold 1 with the injection port aligned. Insert the specimen hole positioning pin 101 and perform injection molding from right to left. After injection molding is completed, open the upper mold 1 and use a tool to remove the middle mold 2 and the injection molding strip as a whole from the removal slot 302. This whole is used for shear strength testing.

[0024] Example 2 Since the mold in Example 1 is a straight keyway, the strength of the injection-molded shear specimen obtained according to the steps of Example 1 is relatively small, and it is easy to separate the polymer-based lubricating material A from the mold. The separated lubricating material is denoted as 2-A.

[0025] Assemble lubricating material 2-A into the specimen slot 301 of the lower mold 3 with the specimen hole 202 on the left. Assemble the upper mold 1 with the injection port aligned. Insert the specimen hole positioning pin 101 and inject polymer B from right to left. After injection, open the upper mold 1 and use a tool to remove the lubricating material 2-A and the injected polymer B as a whole from the removal slot 302. This whole is used for injection shear strength testing between polymers A and B.

[0026] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations to the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A mold for manufacturing injection-molded shear specimens of polymer-based wear-resistant and lubricating materials, characterized in that, The device includes: The upper mold (1) includes a specimen round hole positioning pin (101), a specimen round hole positioning hole (102), an upper mold fixing screw hole one (103), an upper mold fixing screw hole two (104), an upper mold positioning hole one (105), an upper mold positioning hole two (106), and an upper injection port (107). The intermediate mold (2) includes a keyway (201) and a test piece circular hole (202). The lower mold (3) includes a specimen slot (301), a part taking slot (302), a lower mold fixing screw hole one (303), a lower mold fixing screw hole two (304), a lower mold positioning pin hole one (305), a lower mold positioning pin hole two (306), and a lower injection port (307). The middle mold (2) is embedded in the lower mold specimen groove (301), and the upper mold (1) and the lower mold (3) are closed and fixed by fixing bolts and positioning pins.

2. The mold for manufacturing injection shear specimens of polymer-based wear-resistant lubricating material according to claim 1, characterized in that: The depth of the circular hole (202) of the middle mold (2) is the same as the depth of the groove (301) of the lower mold (3), and the length and width of the middle mold (2) are the same as the groove (301) of the mold (3), so as to ensure that the middle mold (2) can be embedded in the groove (301) of the lower mold (3).

3. The mold for manufacturing injection shear specimens of polymer-based wear-resistant lubricating material according to claim 1, characterized in that: The shape of the keyway (201) in the middle mold includes, but is not limited to, any combination of one or more of the following: straight keyway, dovetail keyway, corrugated keyway, array keyway, or other shaped keyways.

4. The mold for manufacturing injection shear specimens of polymer-based wear-resistant lubricating material according to claim 3, characterized in that: The slotting position of the keyway of the middle mold is either through the keyway area or at any position in the keyway area. The slotting direction includes, but is not limited to, any direction parallel to the surface of the middle mold (2). The area of ​​the slotting area includes, but is not limited to, other dimensions of 2cm×2cm. The slotting depth includes, but is not limited to, other values ​​other than 1~3mm.

5. The mold for manufacturing injection shear specimens of polymer-based wear-resistant lubricating material according to claim 1, characterized in that: The length of the locating pin (101) for the round hole of the upper mold (1) should be equal to the sum of the thickness of the upper mold (1) and the depth of the groove (301) of the lower mold (3). The pin head of the locating pin (101) for the round hole of the specimen is located at the center line 5-8 mm away from the right end of the groove (301).

6. The mold for manufacturing injection shear specimens of polymer-based wear-resistant lubricating material according to claim 1, characterized in that: The lower mold (3) has a part-taking groove (302) located to the left of the test piece groove (301), with a groove area of ​​10mm×10mm and a groove depth of 8~12mm; the lower mold (3) has a test piece groove (301) area of ​​8cm×2cm and a depth of 6~10mm.

7. The mold for manufacturing injection shear specimens of polymer-based wear-resistant lubricating material according to claim 1, characterized in that: The test specimen round hole (202) of the middle mold (2) is located at the center line of the test specimen groove (301) of the lower mold (3) 5~8mm from the left end. The diameter of the test specimen round hole (202) and the test specimen round hole positioning pin (101) is 5~8mm.

8. The mold for manufacturing injection shear specimens of polymer-based wear-resistant lubricating material according to claim 1, characterized in that: The upper injection port (107) and lower injection port (307) together form a conical surface with a depth of 3.5~5.5mm and an flaring angle of 75~83°, located on the right end face of the upper mold and the lower mold, with its center line located 35~40mm from the rear end face of the upper mold and the lower mold.

9. The mold for manufacturing injection shear specimens of polymer-based wear-resistant lubricating material according to claim 1, characterized in that: The center lines of the test piece slot (301) and the take-out slot (302) of the lower mold coincide with the center lines of the upper injection port (107) and the lower injection port (307).

10. The mold for manufacturing injection shear specimens of polymer-based wear-resistant lubricating material according to claim 1, characterized in that: The mold is used as follows: the middle mold (2) is assembled into the specimen slot (301) of the lower mold (3) with the specimen hole (202) on the left. The upper mold (1) is assembled with the injection port aligned. The specimen hole positioning pin (101) is inserted. Injection is performed from right to left. After injection, the upper mold (1) is opened. The middle mold (2) and the injection strip are taken out as a whole from the part removal slot (302) using a tool. This whole is used for shear strength testing.

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