A grinding and polishing tool, method of making, method of using

Abstract

The application provides a grinding and polishing tool, a preparation method, a use method and an elastic grinding and polishing tool prepared by the preparation method, wherein the obtained agglomerated material is uniform, has appropriate hardness, is resistant to bending and has good toughness, can perform zoning and sufficient grinding and polishing on an aluminum alloy shell, effectively improves grinding and polishing quality and processing efficiency, has a long service life, effectively improves tool utilization, has small loss in the grinding and polishing process, and due to the rubber-like characteristics, can adapt to the curved surface of the workpiece, thereby adapting to grinding and polishing according to different regions, is rich in functions, and is not easy to produce chippings and dust in grinding and polishing, thereby reducing physical damage to operators.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum alloy processing, in particular to a grinding and polishing tool, a preparation method and a use method. BACKGROUND

[0002] At present, aluminum has an unparalleled excellent performance, which makes it in the golden period for the next 30 years. In addition to the general characteristics of aluminum, aluminum alloy also has some specific characteristics of alloy. Due to its excellent characteristics, it is widely used in the fields of aviation, automobile, building and electronics. The application of aluminum alloy can reduce the comprehensive cost of electronic products and improve the product grade, which is irreplaceable in the field of electronic products.

[0003] The common process flow of electronic product shell is mainly forging, stamping and forming, milling shape, polishing and polishing, post-processing according to needs, and finally secondary finishing. Among them, the surface roughness of the product shell has an important influence on its service life, appearance of finished product and post-processing effect. High surface quality can improve the service life and improve the appearance of the product. The mainstream grinding and polishing method of aluminum alloy at present is manual grinding and polishing and machine tool grinding and polishing, and the types and functions of grinding and polishing tools used are relatively single. The existing grinding and polishing tools are combined with the mainstream processing methods when processing the curved surface of aluminum alloy shell, which consumes a lot of tools, has low efficiency and is difficult to adapt to the curved surface of the workpiece. Manual grinding and polishing has poor consistency, poor flexibility, poor environment and is prone to pneumoconiosis. SUMMARY

[0004] The present application provides a grinding and polishing tool, a preparation method and a use method, which aims to improve at least one of the above technical problems.

[0005] To solve the above technical problems, the present application provides a preparation method of a grinding and polishing tool, which comprises the following steps:

[0006] Step S1: uniformly mix E51 epoxy resin and MDI polyurethane prepolymer in a mass percentage of (8wt%-12wt%):(12wt%-16wt%) to obtain material A; Step S2: add a foaming agent to material A and mix uniformly to obtain material B; Step S3: add silicon carbide abrasive particles with a particle size of 5μm to material B, and then stir uniformly after adding a curing agent to obtain material C; Step S4: heat and cure material C to obtain a lump; further comprising a mounting rod and a connecting bottom disc, the mounting rod is threadedly connected to the upper end of the connecting bottom disc; further comprising step S5: after the lump is adapted and trimmed, it is connected to the bottom end of the connecting bottom disc through glue, to form a grinding and polishing tool.

[0007] As a further optimization, the foaming agent comprises polyether polyol and isocyanate.

[0008] As further optimization, the mass percentage of the polyether polyol and the isocyanate is 16wt% and 16wt% respectively.

[0009] As further optimization, the mass percentage of the silicon carbide abrasive particles is 14wt%.

[0010] As further optimization, the curing agent is 30wt% of di-o-chloro-diphenylamine methane.

[0011] As further optimization, the stirring in step S3 uses an electric stirrer with a speed setting of 800r / min and a dispersion time of 5min.

[0012] As further optimization, the temperature during curing in step S4 is 90℃ and the curing time is 10h.

[0013] As further optimization, the connecting base is made of rubber.

[0014] The application also provides a grinding and polishing tool prepared according to the above preparation method.

[0015] The application also provides a method for using the grinding and polishing tool, comprising the following steps:

[0016] Step D1: measuring the roughness of the area to be ground and polished of the workpiece;

[0017] Step D2: installing the mounting rod of the grinding and polishing tool prepared above by the metal collet of the automatic machine;

[0018] Step D3: importing the data of the grinding and polishing tool and the workpiece into the CAM software and dividing the workpiece into the plane and cylindrical surface area according to the curvature change degree;

[0019] Step D4: after simulation by the software, using the automatic machine to grind and polish the workpiece by the grinding and polishing tool.

[0020] By using the above technical solution, the application can achieve the following technical effects:

[0021] The application provides a grinding and polishing tool, a preparation method and a use method, and the grinding and polishing tool is prepared, wherein the obtained agglomerated material is uniform, has appropriate hardness, is good in bending resistance and toughness, can be used for partitioning and fully grinding and polishing an aluminum alloy shell, and effectively improves grinding and polishing quality and processing efficiency; the service life of the tool is long, the utilization rate of the tool is effectively improved, loss in the grinding and polishing process is small, and due to the rubber-like characteristics, the tool can adapt to the curved surface of the workpiece, so that the grinding and polishing can be adapted according to different regions, the tool is rich in functions, and grinding and polishing is not easy to produce debris and dust, thereby reducing physical damage to operators. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation to the scope, and other related drawings can also be obtained by those skilled in the art without paying creative labor on the basis of the drawings.

[0023] Figure 1 is a structural schematic diagram of a grinding and polishing tool of the application;

[0024] Figure 2 is a schematic diagram of a workpiece in the embodiment of the application;

[0025] Figure 3 is a schematic diagram of grinding and polishing using the tool in the embodiment of the application;

[0026] Figure 4 is roughness before plane grinding in the embodiment;

[0027] Figure 5 is roughness before cylindrical surface grinding in the embodiment;

[0028] Figure 6 is roughness after plane grinding in the embodiment;

[0029] Figure 7 is roughness after cylindrical surface grinding in the embodiment;

[0030] Figure 8 is roughness after plane polishing in the embodiment;

[0031] Figure 9 is roughness after cylindrical surface polishing in the embodiment;

[0032] Markings in the figure: 1, grinding and polishing tool; 2, agglomeration; 3, mounting rod; 4, connecting base plate; 5, workpiece; 6, automatic machine; 7, metal cylinder clamp. DETAILED DESCRIPTION

[0033] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0034] As shown in FIG. 1, the embodiment of the present application provides a preparation method of a grinding and polishing tool, comprising the following steps: Figures 1 to 3

[0035] Step S1: uniformly mixing E51 epoxy resin and MDI polyurethane prepolymer at a mass percentage ratio of (8wt%-12wt%):(12wt%-16wt%) to obtain material A; Step S2: adding a foaming agent to the material A and uniformly mixing to obtain material B; Step S3: adding silicon carbide abrasive grains with a particle size of 5μm and a curing agent to the material B, and then uniformly stirring to obtain material C; wherein, by adding each material in steps S1, S2 and S3, the materials can be fully and uniformly mixed together, so as to ensure that the obtained material C is uniform and consistent as a whole. Moreover, preferably, after adding the silicon carbide abrasive grains and the curing agent in step S3, the mixed material C is uniformly stirred by using an electric stirrer at a stirring speed of 800r / min for 5min, so as to ensure the uniformity of the material C.

[0036] Step S4: heating and curing the material C to obtain a block 2; wherein, during the heating and curing, the material C is poured into a mold, and heating and curing are performed at a temperature of 90℃ for 10h.

[0037] ​Further comprising a mounting rod 3 and a connecting base 4, the mounting rod 3 is threadedly connected to the upper end of the connecting base 4; further comprising a step S5: after the block 2 is demolded from the mold, two sides of the block 2 are adapted to be flattened by using a trimming disc, and then the block 2 is connected to the bottom end of the connecting base 4 by using glue, and the block 2 is placed for 0.5h to wait for the glue to completely dry, thereby forming the elastic grinding and polishing tool 1. Through the mounting rod 3, the tool can be well mounted on the metal cylinder clamp 7 of the automatic machine 6 to perform subsequent grinding and polishing operations. The connecting base 4 is made of rubber material, the lower end is a flat skin with a diameter of 50mm, and the upper end is provided with an external thread of M6. The mounting rod 3 is a stainless steel rod with a length of 70mm and a diameter of 10mm, and is provided with an internal thread of M6 at the bottom end, so as to be threadedly connected to the connecting base 4. The connecting base 4 made of rubber material can play a buffering role between the grinding and polishing tool 1 and the stainless steel mounting rod 3, thereby effectively prolonging the service life of the tool.

[0038] In step S1, the percentage content of the E51 epoxy resin and the MDI polyurethane prepolymer is adjusted according to the required use to change the hardness of the final tool. When used as a grinding tool, the percentage content is 8wt%:16wt%; when used as a polishing tool, the percentage content is 12wt%:12wt%.

[0039] Preferably, the foaming agent comprises polyether polyol and isocyanate, and the mass percentage is 16wt% and 16wt% respectively, at this time, the foaming effect is better, and the performance similar to rubber can be obtained, and the bending resistance and toughness are good.

[0040] Preferably, the mass percentage of the silicon carbide abrasive particles is 14wt%.

[0041] Preferably, the curing agent is 30wt% of di-o-chlorobenzene methane.

[0042] As shown in Figures 1-9 The application also provides a use method of the grinding and polishing tool 1 for a workpiece 5 to be ground and polished with an aluminum alloy shell feature, comprising the following steps:

[0043] Step D1: a three-dimensional model of a workpiece 5 to be ground and polished with an aluminum alloy product shell feature is established in a three-dimensional software, and the workpiece 5 to be ground and polished is processed according to the three-dimensional model, and the roughness of the area to be ground and polished of the workpiece 5 is measured;

[0044] Step D2: the mounting rod 3 of the grinding and polishing tool 1 prepared above is mounted and connected through the metal cylinder clamp 7 of the automatic machine 6;

[0045] Step D3: data of the grinding and polishing tool 1 and the workpiece 5 are imported into the CAM software, and the workpiece 5 is divided into plane and cylindrical surface regions according to the degree of curvature change;

[0046] Step D4: the grinding and polishing distance and the tool rotation speed are set by the software, simulation is carried out, and the actual grinding and polishing of the workpiece 5 by the grinding and polishing tool 1 is carried out by the automatic machine 6. Finally, the surface roughness of the grinding and polishing region is measured.

[0047] In actual grinding and polishing, 6061 aluminum alloy is selected as the raw material of the workpiece 5, and grinding and polishing is carried out. In the process of grinding the plane, the spindle speed is 2500 r / min, and the track distance is 35 mm. In the process of grinding the cylindrical surface, the spindle speed is 2500 r / min, and the track distance is 10 mm. In the process of polishing the plane, the spindle speed is 1500 r / min, and the track distance is 35 mm. In the process of polishing the cylindrical surface, the spindle speed is 1500 r / min, and the track distance is 10 mm. The plane and cylindrical surface of the workpiece 5 are divided into grinding and polishing regions by the grinding and polishing tool 1, which can improve the machining quality and efficiency. The grinding and polishing tool 1 prepared by the application has the characteristics of rubber, has toughness, and has small loss in the grinding and polishing process. Due to the rubber-like characteristics, it can adapt to the curved surface of the workpiece, so that it can be adapted to grinding and polishing according to different regions, has rich functions, and is not easy to produce debris dust, reducing the physical damage to the operator.

[0048] The above only describes the preferred embodiments of the application and is not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A method for preparing a grinding and polishing tool, characterized in that, Includes the following steps: Step S1: Mix E51 epoxy resin and MDI polyurethane prepolymer evenly at a mass percentage of (8wt%-12wt%):(12wt%-16wt%) to obtain material A; Step S2: Add foaming agent to material A and mix evenly to obtain material B; Step S3: Add silicon carbide abrasive particles with a particle size of 5μm and a curing agent to material B and stir evenly to obtain material C; Step S4: Heat and solidify material C to obtain clumps; It also includes an installation rod and a connecting base, wherein the installation rod is threaded to the upper end of the connecting base; it also includes step S5: after the agglomerate is adapted and trimmed, it is adapted and connected to the bottom end of the connecting base with glue to form a grinding and polishing tool; The silicon carbide abrasive particles have a mass percentage of 14 wt%; the curing agent is 30 wt% di-o-chlorodiphenylamine methane.

2. The method for preparing a grinding and polishing tool according to claim 1, characterized in that... The foaming agent includes polyether polyol and isocyanate.

3. The method for preparing a grinding and polishing tool according to claim 2, characterized in that... The polyether polyol and isocyanate are expressed in mass percentages of 16 wt% and 16 wt%, respectively.

4. The method for preparing a grinding and polishing tool according to claim 1, characterized in that... In step S3, an electric stirrer is used for stirring, with a speed of 800 r / min and a dispersion time of 5 min.

5. The method for preparing a grinding and polishing tool according to claim 1, characterized in that... In step S4, the curing temperature is 90℃ and the curing time is 10h.

6. The method for preparing a grinding and polishing tool according to claim 1, characterized in that... The connecting chassis is made of rubber.

7. A grinding and polishing tool, characterized in that... It is prepared by the method according to any one of claims 1 to 6.

8. A method of using a grinding and polishing tool, characterized in that, Includes the following steps: Step D1: Measure the roughness of the areas to be ground and polished on the workpiece; Step D2: The mounting bar of the grinding and polishing tool prepared according to claim 7 is installed and connected by the metal collet of an automated machine; Step D3: Import the data of grinding and polishing tools and workpiece into the CAM software, and divide the workpiece into planar and cylindrical areas according to the degree of curvature change; Step D4: After simulation using software, use automated machines to grind and polish the workpiece using the grinding and polishing tools.

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