A method for processing thin-walled plastic parts

Abstract

The application discloses a processing method of a thin-wall plastic part, S1: preparing a blank material; S2: fixing the blank material by using a vacuum chuck; S3: adopting a segmented processing mode to process four vertical thin-wall surfaces, and the first processing size of the vertical thin-wall surfaces does not reach the final forming size of the vertical thin-wall surfaces; S4: milling out two symmetrically-distributed circular-arc thin-wall surfaces, and milling out cut-off end faces of the notch parts at both ends of the circular-arc thin-wall surfaces; S5: performing second milling processing on the height of the steps around the four vertical thin-wall surfaces, and the size reaches the final forming size; S6: milling the internal structure of a cavity; S7: milling an outer circle, and the peripheral blank material is reserved as a whole; S8: taking down the processed part from the vacuum chuck, and completing the processing; the whole part is not deformed, the qualified rate of part processing is improved, and thus the smooth development of a new product development task is ensured, and the development progress requirement is met.

Description

Technical Field

[0001] This invention relates to the field of milling technology for plastic parts, and in particular to a method for processing thin-walled plastic parts. Background Technology

[0002] With the development of industrial technology, high-end industrial production has gradually entered people's lives. The production and design of various products need to go through several steps, including drawing design, mold shaping and manufacturing. Generally, plastic parts are formed by mold shaping. However, some plastic parts have high precision requirements and need to be processed by milling.

[0003] A prior art prior art document discloses a material removal processing method for thin-walled workpieces, publication number DE102005039148A1, which specifically includes the following processing steps: clamping the blank, removing material from one surface, filling the resulting recesses with a filler material, and removing material from other surfaces. For example, wax is suitable as a filler material; this method is particularly suitable for processing plastic parts or other difficult-to-machine or relatively soft parts, meaning that milling, rotary machining, grinding, etc., can be used to process plastic parts. However, for small plastic parts that require more complex and precise machining, the filler material cannot be used, thus preventing more precise machining operations.

[0004] A contactor with model number Q / JC780-B0N uses a plastic part—a small cap (such as...). Figure 1 The material is PBT plastic. During the product development stage, the parts are machined using milling. These plastic parts are small in size and require high precision. Due to the properties of the material itself and the processing method used, the plastic parts are severely deformed after processing, making most of these plastic parts unusable. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a method for processing thin-walled plastic parts.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides a method for processing thin-walled plastic parts, comprising the following steps:

[0008] S1: Prepare the blank material, which is in the shape of a disc;

[0009] S2: Use a vacuum suction cup to fix the blank material;

[0010] S3: Milling four vertical thin-walled facades. The dimensions of the four vertical thin-walled facades are processed in segments. The dimensions of the vertical thin-walled facades in the first processing do not reach the final forming dimensions of the vertical thin-walled facades.

[0011] S4: Mill two symmetrically distributed arc-shaped thin-walled facades, and simultaneously mill the cut-off end faces of the notched portions at both ends of the arc length of the arc-shaped thin-walled facades;

[0012] S5: Mill around the two arc-shaped thin-walled facades from the notch to form a semi-circular side wall facade. Also, perform a second milling process on the two sets of vertical thin-walled facades. The height of the four vertical thin-walled facades increases, and the dimensions of the four vertical thin-walled facades reach the final forming dimensions.

[0013] S6: Milling the excess material around the cavity to form the internal structure of the cavity, and then milling two circular protrusions and two rectangular grooves inside the cavity;

[0014] S7: Milling the outer circle to form an annular groove between the outer circle and the blank material, while the outer blank material retains a complete ring of material, so that the machined part is not completely separated from the outer blank material.

[0015] S8: Remove the processed part from the vacuum chuck to complete the processing.

[0016] Preferably, in step S2, the vacuum chuck is provided with two positioning pins, and two countersunk holes are milled on the bottom of the blank material. The two countersunk holes are respectively installed on the two positioning pins. The vacuum pump is started, and the vacuum chuck firmly fixes the blank material on the vacuum chuck, so that the bottom and the two countersunk holes serve as positioning references for part processing.

[0017] Preferably, in step S3, the step height dimensions around the four vertical thin-walled facades are milled to separate the four vertical thin-walled facades. Two of the four vertical thin-walled facades are grouped together, and the two groups of vertical thin-walled facades are symmetrically arranged with the center as the center.

[0018] Preferably, in step S4, the height dimension of the arc-shaped thin-walled facade is milled to the required size in one operation, and then the cut end face of the notch is milled to the required size of the part. The height dimension of the arc-shaped thin-walled facade is not milled again during subsequent precision milling of the arc-shaped thin-walled facade.

[0019] Preferably, in step S5, the two groups of vertical thin-walled facades correspond to two arc-shaped thin-walled facades respectively, and the vertical thin-walled facades in the same group are integrally connected with the corresponding arc-shaped thin-walled facades.

[0020] Preferably, in step S7, a 5mm wide annular groove is formed between the outer circle and the blank material, with 0.2mm thick material retained at the bottom of the groove and a complete ring of blank material with a thickness of 2mm retained around the outer perimeter of the groove.

[0021] Preferably, in step S8, the part removed from the vacuum suction cup is placed for 24 hours to allow for natural aging, thereby releasing the processing stress and internal material stress. After the stress is released, the shape and size of the part are completely fixed.

[0022] Preferably, the parts are separated from the blank material by hand. The fitter drills through holes on the two circular protrusions and removes the burrs and flash from the parts, thus completing the processing.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. After processing the semi-finished parts through various procedures, a ring of raw material is retained around the perimeter, providing some protection for the part. The semi-finished part is removed from the vacuum suction cup and no longer processed by milling. It is then placed in a natural environment for 24 hours to allow for natural aging, releasing the processing stress and internal material stress. Since the processed part is not completely separated from the outer raw material at this point, the formed part will not deform. After stress release, the shape and size of the part are completely fixed. The part is then manually separated from the raw material, ensuring that the overall part will not be deformed, improving the part's pass rate, and thus ensuring the smooth progress of the new product development task and meeting the development schedule requirements.

[0025] 2. When machining vertical thin-walled facades, the dimensions of the vertical thin-walled facades are machined in segments to avoid defects such as chipping and deformation during the milling process, thus protecting the overall parts.

[0026] 3. Vacuum chucks are used to clamp and position the parts. On the one hand, the parts are firmly adsorbed, which facilitates the subsequent milling process. On the other hand, it avoids squeezing or even damaging the outer periphery of the parts as much as possible, and provides a certain degree of protection during the part processing to ensure the smooth completion of the part processing. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the component structure of the present invention;

[0028] Figure 2 This is a top view of the component structure of the present invention;

[0029] Figure 3 This is a front view schematic diagram of the component structure of the present invention;

[0030] Figure 4 This is a side view of the component structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the blank material of the present invention;

[0032] Figure 6This is a schematic diagram of the vacuum suction cup structure of the present invention;

[0033] Figure 7 This is a schematic diagram of the machining structure of the parts mainly processed by the present invention on four vertical thin-walled surfaces;

[0034] Figure 8 This is a schematic diagram of the machining structure of the part mainly processed by the present invention for two arc-shaped thin-walled vertical surfaces;

[0035] Figure 9 This is a schematic diagram of the part structure for further processing of four vertical thin-walled facades and two arc-shaped thin-walled facades in this invention.

[0036] Figure 10 This is a schematic diagram of the structure of the semi-finished part of the present invention.

[0037] Explanation of reference numerals in the attached drawings: 1-vacuum suction cup; 101-locating pin; 102-vacuum pump; 2-vertical thin-walled surface; 3-arc thin-walled surface; 4-circular protrusion; 5-rectangular groove; 6-annular groove; 7-counterhead. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0040] In this application embodiment, a processing method for a special thin-walled plastic part is described. This special thin-walled plastic part is a component of a newly developed contactor with model number Q / JC780-B0N, and the material used is PBT plastic.

[0041] The specific structure of the parts is as follows Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this part has four vertical thin-walled facades 2 and two arc-shaped thin-walled facades 3; at the same time, the four vertical thin-walled facades 2 and the two arc-shaped thin-walled facades 3 are all located on the base plate structure.

[0042] This processing method is for processing small cap covers. The specific steps are as follows:

[0043] S1: As Figure 4 As shown, prepare the blank material, which is made of polybutylene terephthalate resin, in the shape of a disc, with dimensions of [missing information]. The dimensions are 92mm × 30mm, which facilitates subsequent clamping and milling, and prevents deformation of the parts during processing.

[0044] S2: As Figure 5 As shown, a vacuum chuck 1 is used to clamp the blank material. The vacuum chuck 1 has two positioning pins 101. Two countersunk holes 7 are milled into the bottom of the blank material. The dimensions of the countersunk holes 7 are... Install the two countersunk holes 7 on the two positioning pins 101 respectively, start the vacuum pump 102, and the vacuum suction cup 1 firmly fixes the blank material on the vacuum suction cup 1, so that the bottom and the two countersunk holes 7 serve as positioning references for part processing and fix the blank material.

[0045] The parts are firmly adsorbed, facilitating subsequent milling. The use of vacuum chuck 1 also avoids over-clamping of the parts, thus preventing damage during processing and ensuring the smooth progress of the entire processing.

[0046] S3: As Figure 7 and Figure 8 As shown, four vertical thin-walled facades 2 are milled using a segmented machining method. First, the initial model of the four vertical thin-walled facades 2 is milled. Then, the height of the steps around the four vertical thin-walled facades 2 is milled to separate the four vertical thin-walled facades 2 and mill their specific dimensions. The dimensions obtained in this machining process do not reach the final formed dimensions to avoid defects such as chipped corners and deformation. Two vertical thin-walled facades 2 that are close to each other are grouped together, so that the two groups of vertical thin-walled facades 2 are symmetrically arranged with the center as the center.

[0047] S4: As Figure 8 As shown, two symmetrically distributed arc-shaped thin-walled facades 3 are milled. The height dimension of the arc-shaped thin-walled facade 3 is milled to the required size in one operation. Then, the cut end face of the notch is milled to the required size of the part. When finishing the arc-shaped thin-walled facade 3 in the subsequent precision milling, the height dimension of the arc-shaped thin-walled facade 3 will not be milled again to avoid the material chipping caused by multiple milling operations.

[0048] S5: As Figure 9 As shown, the two arc-shaped thin-walled facades 3 are milled around the notch to form semi-circular sidewall facades with the dimensions unchanged. The height of the steps around the two sets of vertical thin-walled facades 2 is milled a second time to increase the height of the four vertical thin-walled facades 2. The two sets of vertical thin-walled facades 2 correspond to the two arc-shaped thin-walled facades 3 respectively. The vertical thin-walled facades 2 in the same set are integrally connected with the corresponding arc-shaped thin-walled facades 3 to form the final shape.

[0049] S6: As Figure 10 As shown, the excess material around the cavity is milled to form the internal structure of the cavity, and then two circular protrusions 4 and two rectangular grooves 5 are milled inside the cavity; the outer blank material is retained.

[0050] S7: As Figure 10 As shown, the outer circle is milled, and a 5mm wide annular groove 6 is formed between the outer circle and the blank material. The bottom of the annular groove 6 retains 0.2mm thick material, and the outer perimeter of the annular groove 6 retains a complete ring of blank material with a thickness of about 2mm, so that the machined part is not completely separated from the outer blank material; this facilitates the subsequent separation of the part and the blank material.

[0051] S8: The part removed from the vacuum suction cup 1 is placed for 24 hours, so that the part with the blank material is naturally aged, and the processing stress and internal stress of the material are released. After the stress is released, the shape and size of the part are completely fixed, the processing is completed, and the formed part will no longer deform.

[0052] S9: The parts are separated from the blank material by hand. The fitter drills through holes on the two circular protrusions 4 and removes the burrs and flash from the parts. The processing is then complete.

[0053] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for processing thin-walled plastic parts, characterized in that, The following steps are included: S1: Prepare the blank material, which is in the shape of a disc; S2: Use a vacuum suction cup (1) to fix the blank material; S3: Mill the four vertical thin-walled facades (2). The dimensions of the four vertical thin-walled facades (2) are processed in segments. The dimensions of the vertical thin-walled facades (2) in the first processing do not reach the final forming dimensions of the vertical thin-walled facades (2). Mill the height of the steps around the four vertical thin-walled facades (2) to separate the four vertical thin-walled facades (2). Two of the four vertical thin-walled facades (2) are grouped together, and the two groups of vertical thin-walled facades (2) are symmetrically arranged with the center as the center. S4: Mill two symmetrically distributed arc thin-walled vertical surfaces (3), and at the same time, mill the cut-off end faces of the notch at both ends of the arc length of the arc thin-walled vertical surface (3); S5: Milling is performed around the two arc thin-walled facades (3) from the notch to form a semi-circular side wall facade. The four vertical thin-walled facades (2) are also milled a second time, increasing the height of the four vertical thin-walled facades (2) and bringing the dimensions of the four vertical thin-walled facades (2) to the final forming dimensions. The two sets of vertical thin-walled facades (2) correspond to the two arc thin-walled facades (3) respectively. The vertical thin-walled facades (2) in the same set are integrally connected with the corresponding arc thin-walled facades (3). S6: Milling the excess material around the cavity to form the internal structure of the cavity, and then milling two circular protrusions (4) and two rectangular grooves (5) inside the cavity. S7: Mill the outer circle to form an annular groove (6) between the outer circle and the blank material. The outer blank material retains a complete ring of material, so that the finished part is not completely separated from the outer blank material. S8: Remove the finished parts from the vacuum chuck (1); S9: The part is separated from the blank material by hand. The fitter drills through holes on the two circular protrusions (4) and removes the burrs and flash on the part. The part is completed. This part has four vertical thin-walled surfaces (2) and two arc thin-walled surfaces (3). At the same time, the four vertical thin-walled surfaces (2) and the two arc thin-walled surfaces (3) are all located on the base plate structure.

2. The processing method for a thin-walled plastic part as described in claim 1, characterized in that: In S2, the vacuum chuck (1) is provided with two positioning pins (101). Two countersunk holes (7) are milled on the bottom of the blank material. The two countersunk holes (7) are installed on the two positioning pins (101) respectively. The vacuum pump (102) is started. The vacuum chuck (1) firmly fixes the blank material on the vacuum chuck (1), so that the bottom and the two countersunk holes (7) serve as positioning references for part processing.

3. The processing method for a thin-walled plastic part as described in claim 1, characterized in that: In S4, the height dimension of the arc thin-walled facade (3) is milled in one go, and then the cut end face of the notch is milled to the required size of the part. The height dimension of the arc thin-walled facade (3) will not be processed again when the arc thin-walled facade (3) is subsequently precision milled.

4. The processing method for a thin-walled plastic part as described in claim 1, characterized in that: In S7, a 5mm wide annular groove (6) is formed between the outer circle and the blank material. The bottom of the annular groove (6) retains a 0.2mm thick material, and the outer periphery of the annular groove (6) retains a complete ring of blank material with a thickness of 2mm.

5. The processing method for a thin-walled plastic part as described in claim 1, characterized in that: In step S8, the part removed from the vacuum chuck (1) is placed for 24 hours to allow for natural aging, thereby releasing the processing stress and internal material stress. After the stress is released, the shape and size of the part are completely fixed.

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