A metal-assisted processing method for wet brushing and deburring of copper-chromium contacts

Abstract

The invention discloses a metal-assisted processing method for wet brush deburring of copper-chromium contacts, comprising the following steps: S1, CNC processing a blank to obtain a contact; S2, using a plane brushing unit and a cylindrical brushing unit to deburr the contact; S3, sequentially performing steam degreasing, ultrasonic cleaning, spray cleaning, steam degreasing, and drying on the contact; S4, vacuum packaging after dimensional inspection of the contact. The above method can completely replace manual deburring, can be automated, and realize batch production. It has the process characteristics of high production efficiency, good process universality, short production process, friendly working environment, and good surface consistency of processed products.

Description

Technical Field

[0001] The invention relates to the technical field of electric contact processing, in particular to a metal-assisted processing method for wet brush deburring of copper-chromium contacts. Background Art

[0002] Copper-chromium contact material is currently the most widely used and highest-performing electrical contact material for medium- and high-voltage switchgear. As the most critical component of vacuum interrupters, copper-chromium contacts were initially designed to avoid sharp edges and corners that could lead to tip discharge, poor insulation, poor withstand voltage, and breakdown failure. Designers not only incorporated arc transitions into the structure but also imposed stricter requirements for surface quality. However, due to limitations in manufacturing processes, actual finished products rarely achieve the ideal and demanding design requirements.

[0003] Current contact materials are typically machined using CNC cutting, so burrs and chip residue are unavoidable during the manufacturing process. While CNC machined chamfering and deburring are now possible, existing technology is still limited to removing large burrs on the edges of contact products, while other parts still rely heavily on manual deburring.

[0004] Therefore, as the manufacturing end of contact materials, researching efficient contact processing technology with high automation level, short process flow and high product quality, and researching and applying new deburring technology to replace manual deburring are the directions that contact material manufacturers have been striving to pursue. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a metal-assisted processing method for wet brush deburring of copper-chromium contacts.

[0006] The technical solution of the present invention is: a metal-assisted processing method for wet brush deburring of copper-chromium contacts, comprising the following steps:

[0007] S1. CNC machining

[0008] The blank is processed by CNC in an automated composite processing unit, and the contact is obtained after the processing;

[0009] S2. Deburring

[0010] 1) After the contact is clamped by a fixture, the burrs on the front and back surfaces of the contact are removed using a flat grinding brush unit;

[0011] 2) After the burrs on the front and back surfaces of the contact are removed, the contact is removed from the fixture and the burrs on the outer circle of the contact are removed using an outer circle grinding and brushing unit;

[0012] S3, vacuum degreasing and drying treatment

[0013] After the burrs on the outer circle of the contact are removed, the contact is placed in a vacuum environment and modified alcohol is used as a degreasing solvent. The contact is subjected to a first steam degreasing for 90-110 seconds, an ultrasonic cleaning for 90-110 seconds, a spray cleaning for 70-90 seconds, a second steam degreasing for 70-90 seconds, and a drying for 300-340 seconds. The temperature of the first steam degreasing, the second steam degreasing, and the drying is 80°C.

[0014] S4. Inspection and packaging

[0015] After the drying is completed, the contacts are subjected to a dimension inspection and then vacuum packed.

[0016] The above method can completely replace manual deburring, can be automated, and realize mass production. It has the process characteristics of high production efficiency, good process universality, short production process, friendly working environment, and good surface consistency of processed products. The contact products obtained using this method have the characteristics of good surface structure and smooth edge transition, which has a positive effect on reducing the contact resistance of the contact material, improving the anti-puncture performance, and improving the insulation capacity.

[0017] Furthermore, in steps S1 and S2, the CNC machining, plane grinding and brushing unit, and cylindrical grinding and brushing unit are all cooled with precision extreme pressure cutting oil. Precision extreme pressure cutting oil has a good cooling effect, can prevent high-temperature oxidation of the contacts, reduce tool loss, and prevent grinding debris from sticking.

[0018] Furthermore, in step S2, the conveyor belt linear speed of the surface brush unit is 1-2m / min, and the feed depth of the surface brush is 0.5-1.5mm. By adjusting the above parameters, the force and time of the surface brush can be controlled to achieve a better burr removal effect and avoid damage to the contact surface caused by the surface brush.

[0019] Furthermore, in step S2, the brushing time of the outer cylindrical brushing unit is 5-10s, and the feeding depth of the rotating roller brush is 0.5-1.5mm. By adjusting the above parameters, the force and time of the rotating roller brush can be controlled to ensure the burr removal effect of the outer cylindrical surface of the contact.

[0020] Furthermore, in step S2, the opening diameter D1 of the fixture is: D1=D+0.5mm, where D is the contact diameter. Specifying the opening diameter of the fixture can ensure that the contact is fixed by the fixture, avoiding shaking of the contact during the deburring process to affect the burr removal effect.

[0021] Furthermore, in step S3, the modified alcohol is propylene glycol butyl ether, which can completely remove oil stains on the contact surface, has a good cleaning effect, is safe to use, and has little pollution to the environment.

[0022] Furthermore, in step S4, the dimensional inspection and vacuum packaging are both performed in an environment with a room temperature of 22±2° C. and a relative humidity of less than 50% RH. Controlling the temperature and humidity can prevent the contact surface from being contaminated or oxidized in humid air.

[0023] Furthermore, in step S1, after obtaining the contact, the contact is subjected to surface treatment, and the surface treatment method is:

[0024] 1) Lowering the surface temperature of the contact to -50°C to -30°C, and then completely immersing the contact in a high-temperature deburring liquid for 30 to 45 seconds. The high-temperature deburring liquid has an initial temperature of 60 to 80°C and is diluted 0.5 to 1.5 times with deionized water;

[0025] 2) After the immersion in step 1) is completed, the contact is removed from the high-temperature deburring liquid, the contact surface is heated to 200-280° C., and then the contact is immersed in a low-temperature deburring liquid for 10-15 seconds, wherein the low-temperature deburring liquid has an initial temperature of 0-8° C.;

[0026] 3) Repeat steps 1) and 2) until the temperature of the high-temperature deburring liquid and the low-temperature deburring liquid both reach room temperature, then remove the contact from the deburring liquid and dry the contact at 180-240° C. for 1-3 minutes.

[0027] After the contact has undergone the above-mentioned surface treatment, the cutting residues on the contact surface are completely removed, and under the alternating action of low-temperature contacts and high-temperature deburring fluid, and high-temperature contacts and low-temperature deburring fluid, the burrs on the contact surface will become brittle. During subsequent processing, the burrs are easier to separate from the contact, and it is not easy to produce grinding residues. The contact surface is also smoother after deburring.

[0028] Furthermore, the components of the deburring liquid include, by mass percentage, 10-15% sodium tartaric acid, 10-20% oxalic acid, 3-10% polyethylene glycol, 10-15% dimethylacetamide, 6-12% sodium metatungstate, and the balance deionized water. The above-mentioned deburring liquid can remove debris remaining from cutting, can penetrate into the gaps between burrs, making the burrs further brittle and easier to separate from the contacts, and the surface of the surface-treated contacts is smoother and less rough after brushing.

[0029] The beneficial effects of the present invention are:

[0030] (1) The method of the present invention can completely replace manual deburring, can be automated, and can realize mass production. It has the process characteristics of high production efficiency, good process universality, short production process, friendly working environment, and good surface consistency of processed products. It also has good burr removal effect, low contact surface roughness, and smooth edges.

[0031] (2) The present invention uses a deburring liquid to perform surface treatment on the contact. Under the alternating action of the low-temperature contact and the high-temperature deburring liquid, and the high-temperature contact and the low-temperature deburring liquid, the deburring liquid can penetrate into the gaps of the burrs and make the burrs brittle, making the burrs easier to remove, and the contact surface after brushing is smoother and less rough. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a contact surface diagram of Example 1 of the present invention.

[0033] Figure 2 It is a schematic diagram of the clamp of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with specific implementation methods to better demonstrate the advantages of the present invention.

[0035] Example 1

[0036] A metal-assisted processing method for wet brushing and deburring of copper-chromium contacts comprises the following steps:

[0037] S1. CNC machining

[0038] The blank is processed by an automated composite processing unit CNC, and commercially available precision extreme pressure cutting oil is used for cooling. After the processing is completed, the contact is obtained;

[0039] S2. Deburring

[0040] 1) If Figure 2 As shown, after the contact is clamped with a fixture, the fixture is placed on the conveyor belt of the surface grinding brush unit. The fixture passes through the surface grinding brush rotating above the conveyor belt, and the surface grinding brush removes the burrs on the front side of the contact. Then the fixture is turned over, and the surface grinding brush unit removes the burrs on the back side of the contact.

[0041] 2) After the burrs on the front and back sides of the contact are removed, remove the contact from the fixture, use the external cylindrical brush unit to fix the contact and drive the contact to rotate, and use the rotating roller brush of the external cylindrical brush unit to brush the outer circle of the contact to remove the burrs on the outer circle of the contact;

[0042] Both the surface grinding and cylindrical grinding units were cooled with commercially available precision extreme pressure cutting oil. The fixture opening diameter D1 was 35.5 mm. The conveyor belt speed of the surface grinding unit was 1.5 m / min, and the feed depth of the surface grinding brush was 1 mm. The grinding time of the cylindrical grinding unit was 8 s, and the feed depth of the rotating roller brush was 1 mm.

[0043] S3, vacuum degreasing and drying treatment

[0044] After the burrs on the outer circle of the contact are removed, the contact is placed in a vacuum environment and propylene glycol butyl ether is used as a degreasing solvent. The contact is subjected to a first steam degreasing for 100 seconds, an ultrasonic cleaning for 100 seconds, a spray cleaning for 80 seconds, a second steam degreasing for 80 seconds, and a drying for 320 seconds. The temperature of the first steam degreasing, the second steam degreasing, and the drying are all 80°C.

[0045] S4. Inspection and packaging

[0046] After drying, the contacts are dimensionally inspected and then vacuum-packed. Both the dimension inspection and vacuum packaging are performed in an environment with a room temperature of 22° C. and a relative humidity of 45% RH.

[0047] Example 2

[0048] This embodiment is basically the same as the embodiment 1, except that, in step S1, the surface treatment of the contact is performed after the contact is obtained, and the surface treatment method is:

[0049] 1) Use low-temperature nitrogen to reduce the contact surface temperature to -40°C, and then completely immerse the contact in high-temperature deburring liquid for 40 seconds. The high-temperature deburring liquid has an initial temperature of 70°C and is diluted 100% with deionized water.

[0050] 2) After the immersion in step 1) is completed, the contact is removed from the high-temperature deburring liquid, the contact surface is heated to 240° C., and then the contact is immersed in a low-temperature deburring liquid for 15 seconds. The low-temperature deburring liquid has an initial temperature of 4° C.;

[0051] 3) Repeat steps 1) and 2) until the temperature of the high-temperature deburring liquid and the low-temperature deburring liquid both reach room temperature, then remove the contact and dry it at 210°C for 2 minutes;

[0052] The deburring liquid comprises, by mass percentage, 12% sodium tartrate, 15% oxalic acid, 7% polyethylene glycol, 12% dimethylacetamide, 9% sodium metatungstate, and the balance is deionized water.

[0053] Example 3

[0054] This embodiment is basically the same as embodiment 2, except that the conveyor belt linear speed of the flat grinding brush unit is 1 m / min, and the feed depth of the flat grinding brush is 0.5 mm; the grinding time of the cylindrical grinding brush unit is 5 s, and the feed depth of the rotating roller brush is 0.5 mm.

[0055] Example 4

[0056] This embodiment is basically the same as embodiment 2, except that the conveyor belt linear speed of the flat grinding brush unit is 2m / min, and the feed depth of the flat grinding brush is 1.5mm; the grinding time of the cylindrical grinding brush unit is 10s, and the feed depth of the rotating roller brush is 1.5mm.

[0057] Example 5

[0058] This embodiment is basically the same as embodiment 2, except that low-temperature nitrogen is used to reduce the surface temperature of the contact to -40°C, and then the contact is completely immersed in high-temperature deburring liquid for 30 seconds.

[0059] Example 6

[0060] This embodiment is basically the same as embodiment 2, except that low-temperature nitrogen is used to reduce the surface temperature of the contact to -30°C, and then the contact is completely immersed in high-temperature deburring liquid for 45 seconds.

[0061] Example 7

[0062] This embodiment is basically the same as embodiment 2, except that the initial temperature of the high-temperature deburring liquid is 60°C.

[0063] Example 8

[0064] This embodiment is basically the same as embodiment 2, except that the initial temperature of the high-temperature deburring liquid is 80°C.

[0065] Example 9

[0066] This embodiment is substantially the same as embodiment 2, except that the high-temperature deburring liquid is a deburring liquid diluted 0.5 times with deionized water.

[0067] Example 10

[0068] This embodiment is basically the same as embodiment 2, except that the high-temperature deburring liquid is a deburring liquid diluted 1.5 times with deionized water.

[0069] Example 11

[0070] This embodiment is basically the same as embodiment 2, except that the contact surface is heated to 200° C., and then the contact is immersed in a low-temperature deburring liquid for 10 seconds.

[0071] Example 12

[0072] This embodiment is basically the same as embodiment 2, except that the contact surface is heated to 280° C., and then the contact is immersed in a low-temperature deburring liquid for 20 seconds.

[0073] Example 13

[0074] This embodiment is basically the same as embodiment 2, except that the initial temperature of the low-temperature deburring liquid is 0°C.

[0075] Example 14

[0076] This embodiment is basically the same as embodiment 2, except that the initial temperature of the low-temperature deburring liquid is 8°C.

[0077] Example 15

[0078] This embodiment is substantially the same as embodiment 2, except that the contact is taken out of the deburring liquid and dried at 180° C. for 1 minute.

[0079] Example 16

[0080] This embodiment is substantially the same as embodiment 2, except that the contact is taken out of the deburring liquid and dried at 240° C. for 3 minutes.

[0081] Example 17

[0082] This embodiment is basically the same as embodiment 2, except that the deburring liquid comprises, by mass percentage, 10% sodium tartrate, 10% oxalic acid, 3% polyethylene glycol, 10% dimethylacetamide, 6% sodium metatungstate, and the balance is deionized water.

[0083] Example 18

[0084] This embodiment is basically the same as embodiment 2, except that the deburring liquid comprises, by mass percentage, 15% sodium tartrate, 20% oxalic acid, 10% polyethylene glycol, 15% dimethylacetamide, 12% sodium metatungstate, and the balance is deionized water.

[0085] Example 19

[0086] This embodiment is basically the same as embodiment 2, except that the contacts are sequentially subjected to steam degreasing for 90 seconds, ultrasonic cleaning for 90 seconds, spray cleaning for 70 seconds, secondary steam degreasing for 70 seconds, and drying for 300 seconds.

[0087] Example 20

[0088] This embodiment is basically the same as embodiment 2, except that the contacts are sequentially subjected to steam degreasing for 110 seconds, ultrasonic cleaning for 110 seconds, spray cleaning for 90 seconds, secondary steam degreasing for 90 seconds, and drying for 340 seconds.

[0089] Experimental example

[0090] The contact is processed using the method of Example 1, such as Figure 1As shown, the contact treated by the method of Example 1 has a smooth surface and edges, and the burr removal effect is good.

[0091] At the same time, in order to further explore whether different process parameters will affect the contact surface roughness, the following exploratory experiments are carried out:

[0092] 1. Explore the effect of deburring after surface treatment on the surface roughness of the contact:

[0093] Using Examples 1 and 2 as experimental comparison, the contact surface roughness data obtained are shown in Table 1:

[0094] Table 1 Surface roughness of the contact obtained by deburring after surface treatment

[0095] Group Roughness Example 1 0.630 Example 2 0.425

[0096] It can be seen from the data in Table 1 that the surface roughness of the contact obtained by performing surface treatment on the contact using the method of Example 2 and then brushing to remove burrs is significantly reduced.

[0097] 2. Explore the influence of the parameters of the flat brushing unit and the cylindrical brushing unit on the surface roughness of the contact:

[0098] Using Examples 2, 3, and 4 as experimental comparisons, the contact surface roughness data obtained are shown in Table 2:

[0099] Table 2 Contact surface roughness obtained by different parameters of flat brushing unit and cylindrical brushing unit

[0100] Group Roughness Example 2 0.425 Example 3 0.460 Example 4 0.481

[0101] It can be seen from the data in Table 2 that the parameters of the plane grinding and cylindrical grinding units selected in Example 2 result in the lowest contact surface roughness and the best burr removal effect.

[0102] 3. Investigate the effect of lowering the contact surface temperature on the contact surface roughness:

[0103] Using Examples 2, 5, and 6 as experimental comparisons, the contact surface roughness data obtained are shown in Table 3:

[0104] Table 3 Contact surface roughness obtained by reducing the contact surface temperature at different times

[0105] Group Roughness Example 2 0.425 Example 5 0.458 Example 6 0.443

[0106] From the data in Table 3, it can be seen that the contact surface roughness obtained by lowering the temperature of the contact surface selected in Example 2 is the lowest, the contact surface is the smoothest, and the burr removal effect is the best. The contact surface temperature lowering selected in Example 2 is the best.

[0107] 4. Investigate the effect of different initial temperatures of high-temperature deburring fluid on the surface roughness of the contact:

[0108] Using Examples 2, 7, and 8 as experimental comparisons, the contact surface roughness data obtained are shown in Table 4:

[0109] Table 4 Contact surface roughness obtained at different initial temperatures of high-temperature deburring fluid

[0110] Group Roughness Example 2 0.425 Example 7 0.461 Example 8 0.453

[0111] It can be seen from the data in Table 4 that the initial temperature of the high-temperature deburring liquid selected in Example 2 results in the lowest contact surface roughness and the best burr removal effect.

[0112] 5. Investigate the effect of deburring fluid dilution ratio on contact surface roughness:

[0113] Examples 2, 9, and 10 were used as experimental comparisons. On the basis of Example 2, undiluted deburring liquid was used as Comparative Example 1. The contact surface roughness data obtained are shown in Table 5:

[0114] Table 5 Contact surface roughness obtained by different dilution ratios of deburring liquid

[0115] Group Roughness Example 2 0.425 Example 9 0.434 Example 10 0.442 Comparative Example 1 0.457

[0116] It can be seen from the data in Table 5 that, compared with Examples 2, 9, and 10, the contact surface roughness obtained by using the deburring liquid of Example 2 as a high-temperature deburring liquid with a dilution ratio of the deburring liquid is the lowest and the surface is the smoothest; compared with Comparative Example 1, it can be seen that the deburring liquid of Example 2 after dilution has a better deburring effect as a high-temperature deburring liquid and the contact surface roughness is lower.

[0117] 6. Investigate the influence of contact surface heating temperature on contact surface roughness:

[0118] Using Examples 2, 11, and 12 as experimental comparisons, the contact surface roughness data obtained are shown in Table 6:

[0119] Table 6 Contact surface roughness obtained at different heating temperatures

[0120]

[0121]

[0122] It can be seen from the data in Table 6 that the contact surface heating temperature selected in Example 2 has the lowest contact surface roughness and the best burr removal effect.

[0123] 7. Investigate the effect of different initial temperatures of low-temperature deburring fluid on the surface roughness of the contact:

[0124] Using Examples 2, 13, and 14 as experimental comparisons, the contact surface roughness data obtained are shown in Table 7:

[0125] Table 7 Contact surface roughness obtained at different initial temperatures of low-temperature deburring fluid

[0126] Group Roughness Example 2 0.425 Example 13 0.459 Example 14 0.448

[0127] It can be seen from the data in Table 7 that the initial temperature of the low-temperature deburring liquid selected in Example 2 results in the lowest contact surface roughness and the best burr removal effect.

[0128] 8. Explore the influence of different drying parameters on contact surface roughness:

[0129] Using Examples 2, 15, and 16 as experimental comparisons, the contact surface roughness data obtained are shown in Table 8:

[0130] Table 8 Contact surface roughness obtained with different drying parameters

[0131]

[0132]

[0133] It can be seen from the data in Table 8 that, compared with Example 15, the contact surface roughness obtained by the drying parameters of Example 2 is lower and the surface is smoother. Compared with Example 16, the data of Example 2 and Example 16 are not much different. Considering the time cost, the drying parameters selected in Example 2 are better.

[0134] 9. Explore the effects of deburring fluids with different compositions on contact surface roughness:

[0135] Examples 2, 17, and 18 were used as experimental comparisons. The contact was deburred using commercially available German OPULL-FE deburring solution as comparative example 2. On the basis of Example 2, an equal amount of deionized water was used to replace the sodium metatungstate in the deburring solution as comparative example 3. The surface roughness data of the contact obtained are shown in Table 9:

[0136] Table 9 Contact surface roughness obtained by deburring fluids with different compositions

[0137] Group Roughness Example 2 0.425 Example 17 0.441 Example 18 0.439 Comparative Example 2 0.605 Comparative Example 3 0.586

[0138] It can be seen from the data in Table 9 that, compared with Examples 2, 17, and 18, the deburring liquid composition of Example 2 has a lower contact surface roughness, a smoother contact surface, and a better deburring effect.

[0139] Compared with Comparative Example 2, the deburring liquid selected in Example 2 has lower surface roughness, smoother surface and better deburring effect on the contact.

[0140] Compared with Example 3, the surface roughness of the contact obtained after removing sodium metatungstate in Example 3 becomes greater, indicating that the addition of sodium metatungstate to the deburring liquid in Example 2 can reduce the surface roughness of the contact and improve the deburring effect.

[0141] 10. Investigate the effect of vacuum degreasing time on contact surface roughness:

[0142] Using Examples 2, 19, and 20 as experimental comparisons, the contact surface roughness data obtained are shown in Table 10:

[0143] Table 10 Effect of different vacuum degreasing times on contact surface roughness

[0144] Group Roughness Example 2 0.425 Example 19 0.435 Example 20 0.421

[0145] It can be seen from the data in Table 10 that, compared with Example 19, the contact surface roughness obtained by the vacuum degreasing time in Example 2 is lower and the surface is smoother. Compared with Example 20, the data of the two are not much different. Considering the time cost, the vacuum degreasing time selected in Example 2 is better.

Claims

1. A metal-assisted processing method for wet brushing and deburring of copper-chromium contacts, characterized in that: The following steps are involved: S1. CNC machining The blank is processed by an automated composite processing unit CNC, and a contact is obtained after the processing, and then the contact is surface treated. The surface treatment method is as follows: 1) Lowering the surface temperature of the contact to -50°C to -30°C, and then completely immersing the contact in a high-temperature deburring liquid for 30 to 45 seconds. The high-temperature deburring liquid has an initial temperature of 60 to 80°C and is diluted 0.5 to 1.5 times with deionized water; 2) After the immersion in step 1) is completed, the contact is removed from the high-temperature deburring liquid, the contact surface is heated to 200-280° C., and then the contact is immersed in a low-temperature deburring liquid for 10-20 seconds, wherein the low-temperature deburring liquid has an initial temperature of 0-8° C.; 3) Repeat steps 1) and 2) until the temperature of the high-temperature deburring liquid and the temperature of the low-temperature deburring liquid both reach room temperature, then remove the contact and dry it at 180-240° C. for 1-3 minutes; The deburring liquid comprises, by mass percentage, 10-15% sodium tartrate, 10-20% oxalic acid, 3-10% polyethylene glycol, 10-15% dimethylacetamide, 6-12% sodium metatungstate, and the balance is deionized water; S2. Deburring 1) After the contact is clamped with a fixture, burrs on the front and back surfaces of the contact are removed using a surface grinding and brushing unit; the conveyor speed of the surface grinding and brushing unit is 1-2 m / min, and the feed depth of the surface grinding and brushing is 0.5-1.5 mm; the opening diameter D1 of the fixture is: D1 = D + 0.5 mm, where D is the contact diameter; 2) After the burrs on the front and back surfaces of the contact are removed, the contact is removed from the fixture and the burrs on the outer circle of the contact are removed using an external cylindrical brushing unit; the brushing time of the external cylindrical brushing unit is 5-10 seconds, and the feed depth of the rotating roller brush is 0.5-1.5 mm; S3, vacuum degreasing and drying treatment After the burrs on the outer circle of the contact are removed, the contact is placed in a vacuum environment and modified alcohol is used as a degreasing solvent. The contact is subjected to a first steam degreasing for 90-110 seconds, an ultrasonic cleaning for 90-110 seconds, a spray cleaning for 70-90 seconds, a second steam degreasing for 70-90 seconds, and a drying for 300-340 seconds. The temperature of the first steam degreasing, the second steam degreasing, and the drying is 80°C. S4. Inspection and packaging After the drying is completed, the contacts are subjected to a dimension inspection and then vacuum packed.

2. The metal-assisted processing method for wet brush deburring of copper-chromium contacts according to claim 1, characterized in that: In steps S1 and S2, the CNC machining, the surface grinding and brushing unit, and the cylindrical grinding and brushing unit are all cooled by precision extreme pressure cutting oil.

3. The metal-assisted processing method for wet brush deburring of copper-chromium contacts according to claim 1, characterized in that: In step S3, the modified alcohol is propylene glycol butyl ether.

4. The metal-assisted processing method for wet brush deburring of copper-chromium contacts according to claim 1, characterized in that: In step S4, the size inspection and vacuum packaging are both performed in an environment with a room temperature of 22±2° C. and a relative humidity of less than 50% RH.

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