A process for forming the surface of an engineering plastic disc
By milling steps and notches into the engineering plastic disc and combining high-temperature stress relief treatment with expansion mandrel positioning and rotation, the deformation problem of the plastic disc during processing was solved, achieving high-precision and high-efficiency processing results.
Patent Information
- Application Number
- CN202211735707.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-31
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2042-12-31
AI Technical Summary
In the existing technology, engineering plastic discs are prone to deformation during processing due to factors such as stress, clamping, and machining tool deflection, resulting in poor dimensional and positional tolerances and making it difficult to meet customer requirements.
The process involves roughing, stress relief, and machining, including milling steps, notches, and holes on the plastic disc, using an expansion mandrel to radially position and rotate the plastic disc, and combining high-temperature stress relief with CNC milling and polishing to ensure machining accuracy.
It effectively reduces the deformation of plastic discs during processing, improves the dimensional and positional tolerance accuracy and yield of products, and enhances production efficiency.
Smart Images
Figure CN116175092B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of precision machining, and particularly relates to a forming process for a disc surface of an engineering plastic disc. BACKGROUND
[0002] In the equipment for processing semiconductor devices, there are similar engineering plastic discs with central holes, which are used for electrostatic discharge before processing of semiconductor wafers. The discs of this type have some common features: 1. The flatness requirement of the disc surface is high, which is 0.01-0.001; 2. The parallelism between the upper surface and the lower surface of the disc body is high, which is 0.01-0.053; 3. Generally, the disc body is made of engineering material, and the thickness is relatively thin, which is usually 5-10 mm, and the diameter is about 20 times of the thickness.
[0003] However, in the actual processing process, the conventional processing mode is to clamp and position the plastic disc by using a tooling fixture, and then to process and form the disc surface. After processing, the workpiece is prone to deformation under the influence of factors such as stress, clamping, processing tool setting, etc., which leads to poor shape and position tolerance accuracy of the product, and it is difficult to meet the requirements of customers. SUMMARY
[0004] The technical problem to be solved by the application is to overcome the deficiencies of the prior art, and to provide a brand-new forming process for a disc surface of an engineering plastic disc.
[0005] To solve the above technical problems, the application adopts the following technical solutions:
[0006] A forming process for a disc surface of an engineering plastic disc, the forming process comprising the following steps:
[0007] S1, roughing treatment
[0008] The front and back surfaces of the plastic disc are roughed, and a step, a notch and a hole roughing are milled on the disc surface of the plastic disc by taking the central hole of the plastic disc as a positioning reference.
[0009] S2, stress relief treatment
[0010] The stress remaining on the roughed plastic disc is removed by high temperature.
[0011] S3, cutting processing
[0012] a) An expansion mandrel is inserted into the central hole of the plastic disc, wherein the expansion mandrel abuts against the inner wall of the central hole in the radial direction of the plastic disc, and the plastic disc is driven to rotate by the expansion mandrel, and the front and back surfaces of the plastic disc are synchronously finished.
[0013] b) Each step, notch and hole roughing is precisely milled.
[0014] c) The burrs of the hole are removed, and the processing is completed after polishing and cleaning.
[0015] Preferably, in step S1, the plurality of notches are arranged in a circumferential array around the central hole of the plastic disc, and the plurality of notches are arranged on the edge of the plastic disc and / or the step. In this way, the stress on the plastic disc can be fully released, and the deformation of the plastic disc after the subsequent finishing process can be prevented.
[0016] Preferably, each notch extends along the radial direction of the plastic disc.
[0017] Preferably, in step S1, the front and back surfaces of the plastic disc are roughened with a single-sided allowance of 0.7-1.2 mm, and the step, notch, and hole are roughened with an allowance of 0.3-0.6 mm.
[0018] Preferably, in step S2, the plastic disc is placed in a high-temperature environment of 140-160°C and is kept at this temperature for 3-4 hours. In this way, the stress relieving process can be completed in a short time, and the production efficiency can be improved.
[0019] Preferably, in step S2, after the stress of the plastic disc is relieved, the front and back surfaces of the plastic disc and the step, notch, and hole are semi-finished by CNC milling, and each is left with an allowance of 0.2-0.5 mm.
[0020] Preferably, in step S3, a work disc can also be used, and the plastic disc is glued to the side of the work disc and is driven to rotate by the rotation of the work disc.
[0021] Preferably, in step S3, a white steel knife is used for finishing the front and back surfaces of the plastic disc. In this way, the workpiece can be quickly cut.
[0022] Preferably, in step S3, after the front and back surfaces of the plastic disc are finished, the plastic disc is immersed in cooling water for cooling. In this way, the plastic disc can be quickly cooled, and the heat generation can be reduced.
[0023] In addition, in step S3, wool felt and polishing liquid are used for polishing.
[0024] Thanks to the above technical solutions, the present application has the following advantages compared with the prior art:
[0025] The present application can ensure that the plastic disc remains firm and does not vibrate during processing, and does not deform in the axial direction, effectively reducing the clamping deformation of the plastic disc. At the same time, the notches on the plastic disc can fully release the stress on the plastic disc, thereby ensuring the processing accuracy and improving the yield of the product. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 is a front view of the finished product of the plastic disc according to the present application;
[0027] Figure 2 is Figure 1a top view schematic diagram of the device;
[0028] Wherein: 1, plastic disc; 10, step; 11, notch; 12, hole;
[0029] 2, expanded core rod. DETAILED DESCRIPTION
[0030] In order to make the above objectives, features and advantages of the present application more apparent, a detailed description of the specific embodiments of the present application is given below. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, therefore the present application is not limited to the specific embodiments disclosed below.
[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship as the orientation or positional relationship, only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.
[0032] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.
[0033] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0034] In the present application, unless specifically stated and limited otherwise, a first feature is "on" or "under" a second feature if the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, the first feature is "over", "above" and "on top of" the second feature if the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature is "under", "below" and "underneath" the second feature if the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature. It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not indicative of the only implementation.
[0035] According to the present application, the plastic disc surface forming process comprises the following steps: Figure 1 Figure 2 As shown in the figure, according to the plastic disc surface forming process of the present application, the process mainly comprises three parts, S1, roughing treatment; S2, stress relief treatment; S3, cutting processing.
[0036] Specifically, S1, roughing treatment: roughen the front and back surfaces of the plastic disc 1, and mill steps 10, notches 11 and holes 12 on the disc surface of the plastic disc 1 with the center hole of the plastic disc as the positioning reference, wherein the notches 11 are arranged in multiple and distributed around the circumference of the center hole of the plastic disc 1, and the multiple notches 11 are distributed at the edge of the plastic disc 1 and the steps 10. In this way, it is beneficial to remove the stress on the plastic disc and prevent deformation after the size is in place after the subsequent finishing.
[0037] At the same time, each notch 11 extends along the radial direction of the plastic disc 1.
[0038] Further, the roughing thickness of the front and back surfaces of the plastic disc 1 is 1mm on one side, and the roughing allowance of each step, notch and hole is 0.5mm.
[0039] In this example, S2, stress relief treatment: use high temperature to remove the residual stress on the roughened plastic disc.
[0040] Specifically, the plastic disc 1 is placed in a high temperature environment of 150℃ and kept for 3 hours. In this way, the stress relief time is short, which is beneficial to improve the production efficiency.
[0041] At the same time, in step S2, after the stress of the plastic disc 1 is removed, semi-finishing is performed on the front and back surfaces of the plastic disc 1 and each step, notch and hole by CNC milling, and the allowance is 0.3mm.
[0042] In this example, S3, cutting processing: first, the expanded mandrel 2 is inserted into the central hole of the plastic disc 1, wherein the expanded mandrel 2 is tightly pressed against the inner wall of the central hole in the radial direction of the plastic disc 1, and the plastic disc 1 is driven to rotate by the expanded mandrel 2, and the front and back surfaces of the plastic disc 1 are precisely machined synchronously; secondly, after the front and back surfaces of the plastic disc 1 are precisely machined, the plastic disc 1 is immersed in cooling water for cooling; then, each step, notch, and hole is roughly machined; finally, the burrs of the hole are removed, and the machining is completed after polishing and cleaning.
[0043] In order to facilitate implementation, the white steel knife is used for precisely machining the front and back surfaces of the plastic disc 1. In this way, the workpiece can be quickly cut.
[0044] Meanwhile, in step S3, the wool felt and polishing liquid are used for polishing.
[0045] In addition, in some other specific embodiments, the work disc can also be used, the plastic disc is glued at the side edge of the plastic disc and bonded with the work disc, and the plastic disc is driven to rotate by the rotation of the work disc. All of the above are in order to clamp the plastic disc in a free state to avoid being bent and deformed.
[0046] Therefore, the embodiment has the following advantages:
[0047] 1. By setting the expanded mandrel to tightly press and position the plastic disc in the radial direction, the plastic disc can be kept firm and not vibrate during machining, and the axial deformation can be avoided, thereby effectively reducing the clamping deformation of the plastic disc; at the same time, by machining notches on the plastic disc, the stress on the plastic disc can be fully released, thereby ensuring the machining precision and improving the yield of the product.
[0048] 2. The stress relief time is short, which is beneficial to improve the production efficiency.
[0049] 3. The clamping is simple and the positioning is accurate.
[0050] The above has described the present application in detail, the purpose of which is to enable those skilled in the art to understand the content of the present application and implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A process for forming a top surface of an engineered plastic tray, the process comprising: The forming process comprises the following steps: S1, roughing treatment The front and back surfaces of the plastic disc are roughed, and a step, a notch and a hole are milled on the disc surface of the plastic disc with the center hole of the plastic disc as a positioning reference. The roughing thickness of the front and back surfaces of the plastic disc is 0.7-1.2mm, and the roughing allowance of each step, notch and hole is 0.3-0.6mm; S2, stress relief treatment The stress remaining on the roughed plastic disc is removed by high temperature. After the stress of the plastic disc is removed, the front and back surfaces of the plastic disc and each step, notch and hole are semi-finished by CNC milling, and the allowance is 0.2-0.5mm; S3, cutting processing a) An expansion mandrel is inserted into the center hole of the plastic disc, wherein the expansion mandrel abuts against the inner wall of the center hole in the radial direction of the plastic disc, and the plastic disc is driven to rotate by the expansion mandrel; a work disc is used to glue the side edge of the plastic disc and bond with the work disc, and the plastic disc is driven to rotate by the rotation of the work disc; the front and back surfaces of the plastic disc are finished at the same time; b) Each step, notch and hole is precisely milled; c) The hole burr is removed, and the polishing and cleaning are completed after polishing.
2. The engineered plastic disc face molding process of claim 1, wherein: In step S1, the notches are multiple and are distributed in an array around the circumference of the center hole of the plastic disc, wherein the multiple notches are distributed on the edge of the plastic disc or / and the step.
3. The engineered plastic disc face molding process of claim 2, wherein: Each notch extends along the radial direction of the plastic disc.
4. The engineered plastic disc face molding process of claim 1, wherein: In step S2, the plastic disc is placed in a high temperature environment of 140-160℃, and is kept for 3-4 hours.
5. The engineered plastic disc face molding process of claim 1, wherein: In step S3, the white steel knife is used for finishing the front and back surfaces of the plastic disc.
6. The engineered plastic disc face molding process of claim 1, wherein: In step S3, after the front and back surfaces of the plastic disc are finished, the plastic disc is immersed in cooling water for cooling.
7. The engineered plastic disc face molding process of claim 1, wherein: In step S3, wool felt and polishing liquid are used for polishing.
Citation Information
Patent Citations
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