A method for processing a plane with a flatness of ≤0.05 mm

Abstract

The present invention relates to a method for processing a plane with a flatness of ≤0.05mm, and specifically to the field of surface processing technology, including: sequentially performing a first ultrasonic-assisted milling process and a second ultrasonic-assisted milling process on the surface to be processed of a workpiece; the spindle speed of the first ultrasonic-assisted milling process is greater than the spindle speed of the second ultrasonic-assisted milling process; the feed rate of the first ultrasonic-assisted milling process is less than the feed rate of the second ultrasonic-assisted milling process; the ultrasonic frequency of the first ultrasonic-assisted milling process is less than the ultrasonic frequency of the second ultrasonic-assisted milling process; the amplitude of the first ultrasonic-assisted milling process is less than the amplitude of the second ultrasonic-assisted milling process. The plane processing method provided by the present invention realizes the processing of a plane with a flatness of ≤0.05mm by adopting a specifically designed processing process, which is beneficial to improving the accuracy of airtightness detection and avoiding the occurrence of "false air leakage" in airtightness detection.

Description

Technical Field

[0001] The invention relates to the technical field of surface processing, and in particular to a method for processing a plane with a flatness of ≤0.05 mm. Background Art

[0002] At present, when conducting sealing tests on large devices, it is usually necessary to use a jig to form a closed space, and then to achieve sealing tests through vacuuming and other methods.

[0003] For example, CN102721517A discloses a sealing detection jig, including a lower mold and an upper mold. The upper surface of the lower mold is provided with an annular seal in contact with the parting surface of the product to be tested, and the lower mold inside the ring of the annular seal is provided with an exhaust hole. The upper mold is connected to the cylinder installation. When the upper mold is pressed against the lower mold, a closed cavity from which air can be extracted is formed between the product to be tested and the sealing detection jig. The upper mold is provided with a sealing ring for sealing the screw holes of the product to be tested, and the upper mold is also provided with a core insert for sealing the battery compartment of the product to be tested. The product parts and components can be inspected as a whole, and a one-time test can be performed to determine whether the parts meet the requirements. The negative pressure generated by the internal air extraction is consistent with the pressure of the actual product in deep water, and the simulation is more realistic. A barometer is used to display the internal air pressure in real time, and quantitative judgment is achieved through changes in the air pressure value, which can be fed back to the computer to complete automatic judgment.

[0004] CN220794552U discloses a semiconductor PVD ceramic heater welding air tightness detection jig, which aims to solve the shortcomings of the prior art in that the equipment for detecting the air tightness effect of the welding position between the metal ring and the ceramic disk is complex in structure and has poor detection effect. The present invention solves the above technical problems through the following technical scheme: comprising: a jig body, a cylindrical detection cavity is arranged on the jig body, a first sealing groove is arranged in the circumferential direction of the inner side wall of the detection cavity, and a first sealing ring is arranged in the first sealing groove; a screw hole is arranged through the bottom of the detection cavity, and during the detection process, the metal ring welded on the ceramic disk is matched with the detection cavity, so that a sealed cavity is formed between the detection cavity and the ceramic heater; then a helium mass spectrometer is connected to the screw hole; and a sealed cavity formed between the detection cavity and the ceramic heater is detected by the helium mass spectrometer.

[0005] In summary, whether a sealed cavity can be formed during airtightness testing is the key to achieving airtightness testing. Whether the fitting surface of the jig is flat during jig processing will obviously affect the airtightness of the cavity formed by fitting. However, the current jig processing still has the problem of poor flatness of the processed surface, which leads to the defect of air leakage in the sealed cavity during airtightness testing, resulting in inaccurate airtightness test results. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a plane processing method with a flatness ≤0.05mm, so as to solve the problem that the current fixture processing process still has the problem of poor flatness of the processed plane, resulting in the defect of air leakage in the sealing cavity during the sealing test, resulting in inaccurate sealing test results.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] The present invention provides a method for processing a plane with a flatness of ≤0.05 mm, the method comprising:

[0009] sequentially performing a first ultrasonic-assisted milling process and a second ultrasonic-assisted milling process on the surface to be machined of the workpiece;

[0010] The spindle speed of the first ultrasonic-assisted milling process is greater than the spindle speed of the second ultrasonic-assisted milling process;

[0011] The feed rate of the first ultrasonic assisted milling process is less than the feed rate of the second ultrasonic assisted milling process;

[0012] The ultrasonic frequency of the first ultrasonic-assisted milling process is less than the ultrasonic frequency of the second ultrasonic-assisted milling process;

[0013] The amplitude of the first ultrasonic-assisted milling process is less than the amplitude of the second ultrasonic-assisted milling process.

[0014] The plane processing method provided by the present invention realizes the processing of a plane with a flatness of ≤0.05mm by adopting a specifically designed processing process, which is beneficial to improving the accuracy of airtightness detection and avoiding the occurrence of "false leakage" in airtightness detection (the workpiece has good airtightness, but leakage occurs due to poor airtightness of the fitting surface, resulting in the test result showing that the workpiece has poor airtightness).

[0015] As a preferred technical solution of the present invention, the material of the workpiece includes polypropylene material.

[0016] As a preferred technical solution of the present invention, the spindle speed of the first ultrasonic-assisted drilling and milling process is 180-220 r / min.

[0017] As a preferred technical solution of the present invention, the feed rate of the first ultrasonic-assisted drilling and milling process is 0.02-0.04 mm / r.

[0018] As a preferred technical solution of the present invention, the ultrasonic frequency of the first ultrasonic-assisted drilling and milling process is 12-15 kHz.

[0019] As a preferred technical solution of the present invention, the amplitude of the first ultrasonic-assisted drilling and milling process is 2-3 μm.

[0020] As a preferred technical solution of the present invention, the spindle speed of the second ultrasonic assisted drilling and milling process is 100-125r / min.

[0021] As a preferred technical solution of the present invention, the feed rate of the second ultrasonic assisted drilling and milling process is 0.08-0.1 mm / r.

[0022] As a preferred technical solution of the present invention, the ultrasonic frequency of the second ultrasonic-assisted drilling and milling process is 22-25kHz.

[0023] As a preferred technical solution of the present invention, the amplitude of the second ultrasonic-assisted drilling and milling process is 5-6 μm.

[0024] Compared with the prior art solutions, the present invention has the following beneficial effects:

[0025] The plane processing method provided by the present invention designs a specific processing process according to the characteristics of polymer materials such as polypropylene, adopts a specific ultrasonic assisted milling process, and achieves good processing of the plane. The flatness of the product obtained after processing is ≤0.05mm. DETAILED DESCRIPTION

[0026] To better illustrate the present invention and facilitate understanding of the technical solution of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0027] This embodiment provides a method for processing a plane with a flatness of ≤0.05 mm, the method comprising:

[0028] sequentially performing a first ultrasonic-assisted milling process and a second ultrasonic-assisted milling process on the surface to be machined of the workpiece;

[0029] The spindle speed of the first ultrasonic-assisted milling process is greater than the spindle speed of the second ultrasonic-assisted milling process;

[0030] The feed rate of the first ultrasonic assisted milling process is less than the feed rate of the second ultrasonic assisted milling process;

[0031] The ultrasonic frequency of the first ultrasonic-assisted milling process is less than the ultrasonic frequency of the second ultrasonic-assisted milling process;

[0032] The amplitude of the first ultrasonic-assisted milling process is less than the amplitude of the second ultrasonic-assisted milling process.

[0033] In the present invention, the rotation direction of the milling cutter during processing is the same as the feed direction of the workpiece, thereby further improving the processing effect of the plane.

[0034] Wherein, the material of the workpiece includes polypropylene material.

[0035] Among them, the spindle speed of the first ultrasonic assisted drilling and milling processing is 180-220r / min, for example, it can be 180r / min, 180r / min, 185r / min, 190r / min, 195r / min, 200r / min, 205r / min, 210r / min, 215r / min or 220r / min, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0036] Among them, the feed rate of the ultrasonic assisted drilling and milling processing is 0.02-0.04mm / r, for example, it can be 0.02mm / r, 0.022mm / r, 0.024mm / r, 0.026mm / r, 0.028mm / r, 0.03mm / r, 0.032mm / r, 0.034mm / r, 0.036mm / r, 0.038mm / r or 0.04mm / r, but is not limited to the listed values, and other values ​​not listed in this range also meet the requirements.

[0037] Among them, the ultrasonic frequency of the ultrasonic assisted drilling and milling processing is 12-15kHz, for example, it can be 12kHz, 12.2kHz, 12.4kHz, 12.6kHz, 12.8kHz, 13kHz, 13.2kHz, 13.4kHz, 13.6kHz, 13.8kHz, 14kHz, 14.2kHz, 14.4kHz, 14.6kHz, 14.8kHz or 15kHz, etc., but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0038] Among them, the amplitude of the ultrasonic assisted drilling and milling processing is 2-3μm, for example, it can be 2μm, 2.1μm, 2.2μm, 2.3μm, 2.4μm, 2.5μm, 2.6μm, 2.7μm, 2.8μm, 2.9μm or 3μm, but is not limited to the listed values, and other unlisted values ​​within this range also meet the requirements.

[0039] Among them, the spindle speed of the second ultrasonic assisted drilling and milling processing is 100-125r / min, for example, it can be 100r / min, 102r / min, 104r / min, 106r / min, 108r / min, 110r / min, 112r / min, 114r / min, 116r / min, 118r / min, 120r / min, 122r / min, 124r / min or 125r / min, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0040] Among them, the feed rate of the ultrasonic assisted drilling and milling processing is 0.08-0.1mm / r, for example, it can be 0.08mm / r, 0.082mm / r, 0.084mm / r, 0.086mm / r, 0.088mm / r, 0.09mm / r, 0.092mm / r, 0.094mm / r, 0.096mm / r, 0.098mm / r or 0.1mm / r, but is not limited to the listed values, and other values ​​not listed in this range also meet the requirements.

[0041] Among them, the ultrasonic frequency of the ultrasonic assisted drilling and milling processing is 22-25kHz, for example, it can be 22kHz, 22.2kHz, 22.4kHz, 22.6kHz, 22.8kHz, 23kHz, 23.2kHz, 23.4kHz, 23.6kHz, 23.8kHz, 24kHz, 24.2kHz, 24.4kHz, 24.6kHz, 24.8kHz or 25kHz, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0042] Among them, the amplitude of the ultrasonic assisted drilling and milling processing is 5-6μm, for example, it can be 5μm, 5.1μm, 5.2μm, 5.3μm, 5.4μm, 5.5μm, 5.6μm, 5.7μm, 5.8μm, 5.9μm or 6μm, but is not limited to the listed values, and other unlisted values ​​within this range also meet the requirements.

[0043] Further, in order to illustrate the plane processing effect that can be achieved by the plane processing method of the present invention, the following practical examples are used for illustration, as follows:

[0044] Example 1

[0045] This embodiment provides a method for processing a plane with a flatness of ≤0.05 mm. The specific processing process is as follows:

[0046] sequentially performing a first ultrasonic-assisted milling process and a second ultrasonic-assisted milling process on the surface to be machined of the workpiece;

[0047] The spindle speed of the first ultrasonic assisted milling process is greater than the spindle speed of the second ultrasonic assisted milling process; the feed rate of the first ultrasonic assisted milling process is less than the feed rate of the second ultrasonic assisted milling process; the ultrasonic frequency of the first ultrasonic assisted milling process is less than the ultrasonic frequency of the second ultrasonic assisted milling process; the amplitude of the first ultrasonic assisted milling process is less than the amplitude of the second ultrasonic assisted milling process;

[0048] The spindle speed of the first ultrasonic-assisted drilling and milling process is 200 r / min, the feed rate is 0.03 mm / r, the ultrasonic frequency is 14 kHz, and the amplitude is 2.5 μm;

[0049] The spindle speed of the second ultrasonic-assisted drilling and milling process is 120 r / min, the feed rate is 0.09 mm / r, the ultrasonic frequency is 23 kHz, and the amplitude is 5.5 μm.

[0050] Example 2

[0051] This embodiment provides a method for processing a plane with a flatness of ≤0.05 mm. The specific processing process is as follows:

[0052] sequentially performing a first ultrasonic-assisted milling process and a second ultrasonic-assisted milling process on the surface to be machined of the workpiece;

[0053] The spindle speed of the first ultrasonic assisted milling process is greater than the spindle speed of the second ultrasonic assisted milling process; the feed rate of the first ultrasonic assisted milling process is less than the feed rate of the second ultrasonic assisted milling process; the ultrasonic frequency of the first ultrasonic assisted milling process is less than the ultrasonic frequency of the second ultrasonic assisted milling process; the amplitude of the first ultrasonic assisted milling process is less than the amplitude of the second ultrasonic assisted milling process;

[0054] The spindle speed of the first ultrasonic-assisted drilling and milling process is 210 r / min, the feed rate is 0.035 mm / r, the ultrasonic frequency is 13 kHz, and the amplitude is 2.8 μm;

[0055] The spindle speed of the second ultrasonic-assisted drilling and milling process is 110 r / min, the feed rate is 0.085 mm / r, the ultrasonic frequency is 24 kHz, and the amplitude is 5.8 μm.

[0056] Example 3

[0057] This embodiment provides a method for processing a plane with a flatness of ≤0.05 mm. The specific processing process is as follows:

[0058] sequentially performing a first ultrasonic-assisted milling process and a second ultrasonic-assisted milling process on the surface to be machined of the workpiece;

[0059] The spindle speed of the first ultrasonic assisted milling process is greater than the spindle speed of the second ultrasonic assisted milling process; the feed rate of the first ultrasonic assisted milling process is less than the feed rate of the second ultrasonic assisted milling process; the ultrasonic frequency of the first ultrasonic assisted milling process is less than the ultrasonic frequency of the second ultrasonic assisted milling process; the amplitude of the first ultrasonic assisted milling process is less than the amplitude of the second ultrasonic assisted milling process;

[0060] The spindle speed of the first ultrasonic-assisted drilling and milling process is 180 r / min, the feed rate is 0.02 mm / r, the ultrasonic frequency is 15 kHz, and the amplitude is 3 μm;

[0061] The spindle speed of the second ultrasonic-assisted drilling and milling process is 125 r / min, the feed rate is 0.1 mm / r, the ultrasonic frequency is 22 kHz, and the amplitude is 5 μm.

[0062] Example 4

[0063] This embodiment provides a method for processing a plane with a flatness of ≤0.05 mm. The specific processing process is as follows:

[0064] sequentially performing a first ultrasonic-assisted milling process and a second ultrasonic-assisted milling process on the surface to be machined of the workpiece;

[0065] The spindle speed of the first ultrasonic assisted milling process is greater than the spindle speed of the second ultrasonic assisted milling process; the feed rate of the first ultrasonic assisted milling process is less than the feed rate of the second ultrasonic assisted milling process; the ultrasonic frequency of the first ultrasonic assisted milling process is less than the ultrasonic frequency of the second ultrasonic assisted milling process; the amplitude of the first ultrasonic assisted milling process is less than the amplitude of the second ultrasonic assisted milling process;

[0066] The spindle speed of the first ultrasonic-assisted drilling and milling process is 220 r / min, the feed rate is 0.04 mm / r, the ultrasonic frequency is 12 kHz, and the amplitude is 2 μm;

[0067] The spindle speed of the second ultrasonic-assisted drilling and milling process is 100 r / min, the feed rate is 0.08 mm / r, the ultrasonic frequency is 25 kHz, and the amplitude is 6 μm.

[0068] Comparative Example 1

[0069] The only difference from Example 1 is that the spindle speed of the first ultrasonic-assisted drilling and milling process is 120 r / min.

[0070] Comparative Example 2

[0071] The only difference from Example 1 is that the feed rate of the first ultrasonic-assisted drilling and milling process is 0.1 mm / r.

[0072] Comparative Example 3

[0073] The only difference from Example 1 is that the ultrasonic frequency of the first ultrasonic-assisted drilling and milling process is 30 kHz.

[0074] Comparative Example 4

[0075] The only difference from Example 1 is that the amplitude of the first ultrasonic-assisted drilling and milling process is 6 μm.

[0076] Comparative Example 5

[0077] The only difference from Example 1 is that the spindle speed of the second ultrasonic-assisted drilling and milling process is 220 r / min.

[0078] Comparative Example 6

[0079] The only difference from Example 1 is that the feed rate of the second ultrasonic-assisted drilling and milling process is 0.03 mm / r.

[0080] Comparative Example 7

[0081] The only difference from Example 1 is that the ultrasonic frequency of the second ultrasonic-assisted drilling and milling process is 14 kHz.

[0082] Comparative Example 8

[0083] The only difference from Example 1 is that the amplitude of the second ultrasonic-assisted drilling and milling process is 2 μm.

[0084] Comparative Example 9

[0085] The only difference from Example 1 is that ultrasonic assistance is not performed in the first ultrasonic-assisted drilling and milling process, that is, only milling is performed, and the spindle speed during the milling process is 200 r / min and the feed rate is 0.03 mm / r.

[0086] The plane processing process of the embodiment and the comparative example was used to perform plane processing on the polypropylene sheet. The plane of the product obtained by the processing was tested for flatness using a three-coordinate detection method. The results are shown in Table 1 below.

[0087] Table 1

[0088] Flatness / mm Example 1 0.01 Example 2 0.008 Example 3 0.04 Example 4 0.02 Comparative Example 1 0.18 Comparative Example 2 0.16 Comparative Example 3 0.12 Comparative Example 4 0.13 Comparative Example 5 0.15 Comparative Example 6 0.23 Comparative Example 7 0.09 Comparative Example 8 0.15 Comparative Example 9 0.23

[0089] As can be seen from Table 1, the solution provided by the present invention achieves plane processing with a flatness of ≤0.05 mm by adopting a specific ultrasonic assisted drilling process, which is conducive to the formation of a dense sealing cavity by the airtightness detection fixture, thereby improving the accuracy of the airtightness detection.

[0090] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0091] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0092] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for processing a plane with a flatness of ≤0.05 mm, characterized in that: The plane processing method comprises: sequentially performing a first ultrasonic-assisted milling process and a second ultrasonic-assisted milling process on the surface to be machined of the workpiece; The spindle speed of the first ultrasonic-assisted milling process is greater than the spindle speed of the second ultrasonic-assisted milling process; The feed rate of the first ultrasonic assisted milling process is less than the feed rate of the second ultrasonic assisted milling process; The ultrasonic frequency of the first ultrasonic-assisted milling process is less than the ultrasonic frequency of the second ultrasonic-assisted milling process; The amplitude of the first ultrasonic-assisted milling process is less than the amplitude of the second ultrasonic-assisted milling process.

2. The plane processing method according to claim 1, characterized in that: The material of the workpiece includes polypropylene material.

3. The plane processing method according to claim 1 or 2, characterized in that: The spindle speed of the first ultrasonic-assisted drilling and milling process is 180-220 r / min.

4. The plane processing method according to any one of claims 1 to 3, characterized in that: The feed rate of the first ultrasonic-assisted drilling and milling process is 0.02-0.04 mm / r.

5. The plane processing method according to any one of claims 1 to 4, characterized in that: The ultrasonic frequency of the first ultrasonic-assisted drilling and milling process is 12-15 kHz.

6. The plane processing method according to any one of claims 1 to 5, characterized in that: The amplitude of the first ultrasonic-assisted drilling and milling process is 2-3 μm.

7. The plane processing method according to any one of claims 1 to 6, characterized in that: The spindle speed of the second ultrasonic-assisted drilling and milling process is 100-125 r / min.

8. The plane processing method according to any one of claims 1 to 7, characterized in that: The feed rate of the second ultrasonic-assisted drilling and milling process is 0.08-0.1 mm / r.

9. The plane processing method according to any one of claims 1 to 8, characterized in that: The ultrasonic frequency of the second ultrasonic-assisted drilling and milling process is 22-25 kHz.

10. The plane processing method according to any one of claims 1 to 9, characterized in that: The amplitude of the second ultrasonic-assisted drilling and milling process is 5-6 μm.