A watchband connector processing method

Abstract

The application relates to the technical field of machining, and discloses a watchband connecting piece machining method, which comprises the following steps: providing a blank; the blank has a cross section size matched with that of the watchband connecting piece; CNC1 machining: the blank is clamped and positioned by using a special-shaped chuck, feeding is carried out by using a feeding device, and the structure of the watchband connecting piece is milled and formed by using a main shaft; CNC2 machining: the cutting surface of the semi-machined watchband connecting piece is milled by using a B shaft; and surface treatment: the surface of the semi-finished watchband connecting piece is subjected to rolling polishing, sand blasting treatment and PVD coating treatment. The application provides the watchband connecting piece machining method, the special-shaped chuck matched with the cross section of the watchband connecting piece can avoid clamp damage to the workpiece; the feeding device is used, and the cooperation of the main shaft and the B shaft of the precision lathe is used to realize automatic feeding and automatic machining.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical processing, and in particular to a method for processing a watch strap connector. Background Art

[0002] A metal watch strap is typically made up of multiple connectors. These thin-walled metal components are characterized by their small size and hollow, thin-walled structure. This makes machining them challenging and typically requires high-precision equipment.

[0003] Watchband connectors are typically processed using CNC machining, or numerically controlled precision machining. This method uses computer numerically controlled automated machine tools and computers to precisely control the machining process, resulting in high-precision watchband connector processing. The specific processing steps generally include: blank cutting - CNC1 milling - CNC2 milling - workpiece surface treatment - quality inspection - and packaging. Due to the structural characteristics of the watchband connector (which features a flat end face, an opening on the bottom of the inner cavity, and through-holes in the thin side walls), the CNC machining process must be divided into two steps. The first CNC machining process primarily mills the inner cavity, opening, through-hole, and thin-wall structure of the watchband connector. Simultaneously, the semi-finished watchband connector, which has been formed, is separated from the blank according to its dimensions. The second CNC machining process mills the surface of the cut surface (i.e., the end face of the watchband connector) in the first CNC step.

[0004] However, the above two-step CNC machining still has the following problems in actual production: 1. Since the semi-processed watch strap connector needs to be repositioned and clamped before the second CNC machining, the repeatability of the machine tool will be affected, which in turn affects the finished size of the watch strap connector; 2. After the blank has undergone the first CNC machining, the semi-processed watch strap connector has a thin-walled structure. During the clamping process, if the fixture structure is unreasonable, it is easy to cause damage to the thin wall on the side of the watch strap connector, thereby affecting the yield; 3. Two clamping positions need to be set, and each clamping position requires manual operation, which has low operating efficiency and is not suitable for mass production. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide a method for processing watch strap connectors to solve the problems of thin walls of watch strap connectors being pinched and dimensions being unqualified during processing.

[0006] In order to solve the above technical problems, the present invention adopts a technical solution: providing a watch strap connector processing method comprising the following steps:

[0007] S1: Providing a blank: providing a blank having a cross-sectional size that matches the cross-sectional size of the watch strap connector;

[0008] S2: CNC1 machining: The blank is clamped and positioned by a first special-shaped chuck, the special-shaped chuck being connected to a feeding device so as to feed the blank to a spindle of a precision lathe according to a preset feeding size through the feeding device; the blank is subjected to milling and shaping of the structure of the watch band connector by the spindle, and the blank is cut by the spindle according to a preset cutting size to obtain a semi-processed watch band connector; wherein, while the blank is being cut, the semi-processed watch band connector connected to the blank is clamped by a second special-shaped chuck, the blank and the semi-processed watch band connector are clamped and positioned by the first special-shaped chuck and the second special-shaped chuck, and the connecting portion is cut to separate the semi-processed watch band connector from the blank to obtain the semi-processed watch band connector;

[0009] S3, CNC2 machining: milling the cutting surface of the semi-processed watchband connector clamped by the second special-shaped chuck using the B-axis of the precision lathe to obtain a semi-finished watchband connector;

[0010] S4: Surface treatment: Roll-polishing the surface of the semi-finished watch band connector with a roller burnishing machine, sandblasting the end surface of the semi-finished watch band connector with a sandblasting machine, and PVD coating the semi-finished watch band connector with a PVD coating device to obtain a finished watch band connector;

[0011] The first special-shaped chuck includes a column, a clamping portion formed at a first end of the column, a feed port formed at a second end of the column, and a material passage connected between the feed port and the clamping portion; the processed end of the blank enters the feed port and passes through the material passage to be clamped by the clamping portion, and the clamped end of the blank extends out of the clamping portion in a direction away from the feed port and is exposed outside the clamping portion;

[0012] In step S1, the feeding device is controlled to feed the blank according to a preset feeding size: the feeding device is controlled to feed the blank to the first special-shaped clamp along the length direction of the first special-shaped clamp, so that the blank extends out of the clamping portion away from the feed opening after passing through the feed opening and the material passage, and the feeding is suspended when the blank extends out of the clamping portion by a predetermined distance;

[0013] In step S2, when the processing end of the blank extends out of the clamping portion by a preset distance, the first special-shaped chuck clamps the blank; and CNC1 processing is performed on the processing end of the blank exposed outside the clamping portion.

[0014] Furthermore, in step S1, the cross-sectional shape of the blank is the same as that of the watchband connector, and the cross-sectional size of the blank processed is larger than the cross-sectional size of the watchband connector.

[0015] Furthermore, the second special-shaped chuck has the same structure as the first special-shaped chuck.

[0016] Furthermore, the column includes a shell wall and a through hole formed in the shell wall and extending along the length direction thereof, the shell wall is formed with a plurality of through slots distributed around the outer circumference thereof, each through slot is formed by the first end face of the shell wall opening in the direction of the second end, and each through slot extends through the shell wall in the radial direction of the shell wall, the plurality of through slots divide the first end of the shell wall into a plurality of clamping blocks, the plurality of clamping blocks can be retracted inwardly to clamp the blank when an inward force is applied from the outside, and the plurality of clamping blocks can release the blank after the inward force is released; the plurality of clamping blocks and the plurality of through slots form the clamping portion;

[0017] A section of the through hole located at the clamping portion forms a contoured hole that is contoured to the blank, a portion of the through hole located at the second end face of the shell wall forms the feed port, and a section of the through hole located between the feed port and the clamping portion forms the feed channel.

[0018] Furthermore, in step S2, the main shaft is connected to a frequency converter, and the maximum speed of the main shaft is increased by the frequency converter.

[0019] Furthermore, in the step of milling the blank to form the structure of the watch strap connector by the spindle, the step of cutting the blank according to a preset cutting size by the spindle includes:

[0020] Groove rough milling: set the spindle speed to 28,000-50,000 rpm and the milling speed to 600-900 mm / min, and roughly mill the outer contour of the watch strap connector along the end face of the blank according to the height size and cross-sectional shape of the watch strap connector;

[0021] Inner cavity fine milling: set the spindle speed to 28,000-50,000 rpm and the milling speed to 300-500 mm / min, and fine mill the inner cavity of the watch strap connector along the end face of the roughly milled outer contour according to the inner cavity depth and shape of the watch strap connector;

[0022] Chamfer milling: setting the spindle speed to 5000-7000 rpm and the milling speed to 400-600 mm / min, and chamfering the end surface of the thin wall of the strap connector;

[0023] Milling: Set the spindle speed to 5000-7000 rpm and the milling speed to 200-400 mm / min, and mill the hole according to the position and depth of the hole at the bottom of the inner cavity of the strap connector;

[0024] Cutting, set the spindle speed to 5000~7000rpm, the milling speed to 300~500mm / min, and cut and separate the semi-processed watch strap connector that has been milled on the blank according to the height size of the watch strap connector and the preset cutting allowance.

[0025] Furthermore, the step of milling the cutting surface of the semi-processed watchband connector clamped by the second special-shaped chuck by the B-axis of the precision lathe specifically includes:

[0026] The B-axis is used to position the cutting surface of the semi-finished watchband connector; and the B-axis of the precision lathe is used to mill the cutting surface of the semi-finished watchband connector clamped by the special-shaped chuck.

[0027] Furthermore, the step of rolling and polishing the surface of the semi-finished watchband connector by a rolling machine includes:

[0028] The spindle frequency of the roller burnishing machine is set to 30~50Hz, the forward rotation time is set to 10~20min, and the reverse rotation time is set to 10~20min. Chrome corundum is used as an abrasive and polishing agent is used as a roller burnishing liquid to perform roller burnishing on the outer surface and inner cavity surface of the semi-finished watch strap connector.

[0029] Furthermore, in the step of sandblasting, the following steps are included: configuring the sandblasting machine parameters, setting the sandblasting angle to 30°~60°, the sandblasting height to 10cm+ / -2.5, and the sandblasting pressure to 1.2~1.4kg / cm 2 The nozzle swing frequency is 40~42HZ, the conveyor belt frequency is 8~12HZ, the sandblasting time is 3~6min, and the sandblasting material is zircon sand; according to the configured sandblasting machine parameters, the end face of the semi-finished watch strap connector is sandblasted.

[0030] Furthermore, the PVD coating step includes: performing PVD coating on the semi-finished watch strap connector with a coating thickness of 1.5+ / -0.3um.

[0031] Furthermore, after the steps of rolling polishing and sandblasting, the method further includes cleaning the semi-finished connector, degreasing with an ultrasonic and degreasing agent, rinsing, degreasing with a degreasing agent, rinsing, spray cleaning, ultrasonic rinsing, slow pulling and dehydration, drying, and drying; wherein:

[0032] In the ultrasonic and degreasing step, an aluminum degreasing agent with a concentration of 5% to 8% is used to degrease the semi-finished watchband connector for 180±30s at a temperature of 55±5° using 40Khz ultrasonic waves;

[0033] In the rinsing step, the semi-finished watchband connector is rinsed with purified water at a temperature of 55±5° for 100±10 seconds. In the degreasing step, an aluminum degreaser having a concentration of 5% to 8% is used to degrease the semi-finished watchband connector again at a temperature of 55±5° for 180±30 seconds.

[0034] In the spray cleaning step, the semi-finished watchband connector is spray cleaned with purified water at room temperature for 60±10 seconds; in the ultrasonic rinsing step, the semi-finished watchband connector is cleaned with purified water and 40Khz ultrasound at a temperature of 55±5° for 100±10 seconds;

[0035] In the slow dehydration step, the semi-finished watchband connector is dehydrated using pure water at a temperature of 75±5° for 50±10 seconds;

[0036] In the drying step, the semi-finished watchband connector is dried at room temperature for 120±10 seconds;

[0037] In the drying step, the semi-finished watchband connector is dried at a temperature of 70±5° for 400-500 seconds.

[0038] The watch strap connector processing method of the present invention has at least the following beneficial effects: through the special-shaped chuck that can match the cross-section of the watch strap connector, the clamping of the workpiece by the clamp is avoided; through the feeding device, and by utilizing the cooperation between the spindle and the B-axis of the precision lathe, automatic loading and automatic processing are achieved; through the frequency converter, the spindle speed is increased, avoiding frequent breakage of the spindle milling cutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0040] Figure 1 It is a structural schematic diagram of the watchband connector of the present invention;

[0041] Figure 2 This is a flowchart of a method for processing a watch strap connector according to the present invention;

[0042] Figure 3 This is a flow chart of CNC1 processing in the watch strap connector processing method of the present invention;

[0043] Figure 4 This is a schematic diagram of the structure of the blank after rough groove milling;

[0044] Figure 5This is a schematic diagram of the structure of the blank after fine milling of the inner cavity;

[0045] Figure 6 This is a schematic diagram of the structure of the blank after chamfer milling;

[0046] Figure 7 This is a schematic diagram of the structure of the blank after milling;

[0047] Figure 8 A flow chart of the cleaning process in the processing method of the present invention;

[0048] Figure 9 It is a structural schematic diagram of the first special-shaped chuck of the present invention;

[0049] Figure 10 A view of the first special-shaped chuck of the present invention in the direction of the end face of the clamping end;

[0050] Figure 11 This is a schematic diagram of the structure when a special-shaped chuck is clamping a blank;

[0051] Figure 12 This is a structural schematic diagram of the second special-shaped clamp clamping the thin wall of the semi-finished watchband connector.

[0052] The meanings of the reference numerals in the accompanying drawings are:

[0053] Watchband connector 1; thin wall 11; through hole 12; opening 13; first special-shaped chuck 2a; second special-shaped chuck 2b; contoured hole 21; feed channel 22; through slot 23; clamping block 24; feed port 25;

[0054] Blank 110; shallow groove 111; deep groove 112; inner cavity 113; thin-wall end face 114; thin-wall chamfer 115. DETAILED DESCRIPTION

[0055] The present invention will be further described below with reference to the accompanying drawings.

[0056] like Figures 1 to 12 As shown, the present invention provides a method for processing a watch strap connector. This method is aimed at processing a special component, the watch strap connector, and also involves a special-shaped chuck that matches the shape of the watch strap connector.

[0057] like Figure 1As shown, the watchband connector 1 of the present invention is constructed by radially stretching a cylindrical body along its end surface. One end of the cylindrical body has a flat end surface, and the other end defines an inner cavity 113. The bottom surface of the inner cavity 113 defines an opening 13, and a through-hole 12 is formed in the thin wall 11. In this embodiment, the dimensions of the watchband connector 1 are L×W×H: 5.2×1.93×1.8, meaning its length, width, and height are 5.2 mm, 1.93 mm, and 1.8 mm, respectively.

[0058] like Figure 2 and Figure 3 As shown, the watch strap connector processing method of the present invention includes the following steps:

[0059] S1: Providing a blank 110: Providing a blank 110 with a cross-sectional size that matches the cross-sectional size of the watchband connector 1.

[0060] In step S1, the dimensions and shape of the blank 110 are designed based on the dimensions of the aforementioned watchband connector 1. Specifically, the blank 110 is a long strip of steel. Milling and cutting are performed on the blank 110 to obtain a semi-finished watchband connector. The cross-sectional shape of the blank 110 is the same as that of the watchband connector 1, thereby facilitating milling and positioning. The cross-sectional dimensions of the blank 110 are larger than those of the watchband connector 1 to ensure a sufficient margin for subsequent milling. In this embodiment, the specific dimensions of the blank 110 can be set to L×W×H: 5.4×2.1×1500, i.e., its length, width, and height are 5.4mm, 2.1mm, and 1500mm, respectively. The blank 110 can be made of 316 steel.

[0061] S2: CNC1 processing: the blank 110 is clamped and positioned by the first special-shaped chuck 2a; the structure of the watch strap connector 1 is milled and formed on the blank 110 by the spindle of a precision lathe, and the blank 110 is cut by the spindle according to a preset cutting size to obtain a semi-processed watch strap connector; wherein, when the blank 110 is cut, the semi-processed watch strap connector connected to the blank 110 is clamped by a second special-shaped chuck 2b, so that the blank 110 and the semi-processed watch strap connector are clamped and positioned by the first special-shaped chuck 2a and the second special-shaped chuck 2b, and the connecting part is cut to separate the semi-processed watch strap connector from the blank 110 to obtain the semi-processed watch strap connector.

[0062] Specifically, in this embodiment, CNC machining can use a group of precision CNC lathes. The main process of CNC1 machining is to use a spindle milling cutter to mill and cut the blank 110 to form the structure of the watch strap connector 1.

[0063] Please refer to Figure 3 , this step S2 may specifically include the following steps:

[0064] S21: Groove rough milling, set the spindle speed to 28000-50000 rpm, milling speed to 600-900 mm / min, according to the height dimension and cross-sectional shape of the watchband connector 1, rough mill the profile contour of the watchband connector 1 along the end face of the blank 110;

[0065] Please refer to Figure 4 In this step, the shallow groove 111 and the deep groove 112 are respectively milled from the end face of the blank 110 along the axial direction of the blank 110 by the spindle milling cutter.

[0066] S22: Inner cavity fine milling, set the spindle speed to 28000-50000 rpm, milling speed to 300-500 mm / min, according to the depth of the inner cavity 113 of the watchband connector 1 and the shape of the inner cavity 113, fine mill the inner cavity 113 of the watchband connector 1 along the end face of the rough-milled profile contour;

[0067] Please refer to Figure 5 In this step, the inner cavity 113 is milled inward from the above-mentioned shallow groove 111 along the axial direction of the blank 110 by the spindle milling cutter, and the opening 13 is milled at the preset position on the bottom surface of the inner cavity 113 at this time, and the thin wall 11 is formed between the deep groove 112 and the inner cavity 113.

[0068] S23: Chamfer milling, set the spindle speed to 5000-7000 rpm, milling speed to 400-600 mm / min, chamfer mill the end face of the thin wall 11 of the watchband connector 1;

[0069] Please refer to Figure 6 In this step, the chamfer milling is performed on the end face of the above-mentioned thin wall 11, i.e. the thin wall end face 114, by the spindle milling cutter, thereby forming the thin wall chamfer 115.

[0070] S24: Milling hole, set the spindle speed to 5000-7000 rpm, milling speed to 200-400 mm / min, mill the opening 13 according to the position and depth of the bottom opening 13 of the inner cavity 113 of the watchband connector 1;

[0071] Please refer to Figure 6 In this step, the through hole 12 is milled on the thin wall 11 along the length direction thereof by the spindle milling cutter.

[0072] S25: Section, set the spindle speed to 5000-7000 rpm, milling speed to 300-500 mm / min, according to the height dimension of the watchband connector 1 and the preset section allowance, cut and separate the semi-processed watchband connector which has been milled and formed on the blank 110.

[0073] After the four processing steps of groove rough milling, inner cavity fine milling, chamfer milling and hole milling, the semi-processed watchband connector is completely formed on the blank 110, and at this time, it only needs to be cut and separated from the blank 110 along the surface of the deep groove 112, so that it can enter the subsequent surface treatment processing. In this step, according to the height size of the watchband connector 1 and the preset cutting surface allowance, the spindle speed is set to 5000-7000 rpm, and the milling speed is set to 300-500 mm / min. Preferably, the spindle speed is set to 6000 rpm, and the milling speed is set to 400 mm / min, so as to cut and separate the semi-processed watchband connector which has been milled and formed on the blank 110.

[0074] It is worth mentioning that the conventional CNC1 processing ends after cutting, and the workpiece needs to be clamped separately, so as to enter the CNC2 processing. However, in order to realize the automatic feeding and the automatic operation of CNC1-CNC2 processing, before entering the CNC2 processing, the semi-processed watchband connector is cut and separated from the blank 110 by the spindle, and in order to connect the CNC1 and CNC2 processing processes, a second special chuck 2b is arranged at the B shaft end of the precision lathe. Before the operation of cutting and separating the semi-processed watchband connector from the blank 110 is completed, the second special chuck 2b is used to position the inner cavity 113 of the semi-processed watchband connector, and at the same time, the side wall, i.e. the thin wall 11 of the semi-processed watchband connector is clamped by the profiling hole 21, so as to facilitate the B shaft to mill the surface of the cutting surface of the semi-processed watchband connector. Since the profiling hole 21 has the same cross-sectional shape as the semi-processed watchband connector, the thin wall 11 can be completely wrapped when clamped, so as to avoid the thin wall 11 being damaged during clamping.

[0075] Please refer to Figures 9 to 12In this embodiment, the structures of the first special-shaped chuck 2a and the second special-shaped chuck 2b are exactly the same. Specifically, the first special-shaped chuck 2a and the second special-shaped chuck 2b each include a column, a clamping portion formed at a first end of the column, a feed port 25 formed at a second end of the column, and a material passage 22 connected between the feed port 25 and the clamping portion; the processing end of the blank 110 enters from the feed port 25 and passes through the material passage 22 and is clamped by the clamping portion, and the clamped end of the blank 110 extends out of the clamping portion in a direction away from the feed port 25 and is exposed outside the clamping portion. In step S1, The feeding device controls the feeding of the blank 110 according to a preset feeding size: the feeding device feeds the blank 110 to the first special-shaped chuck 2a along the length direction of the first special-shaped chuck 2a, so that the blank 110 extends out of the clamping part away from one end of the feed port 25 after passing through the feed port 25 and the feed channel 22, and the feeding is suspended when the blank 110 extends out of the clamping part by a preset distance; in steps S2 and S3, when the processing end of the blank 110 extends out of the clamping part by a preset distance, the first special-shaped chuck 2a clamps the blank 110; and CNC1 and CNC2 processing are performed on the processing end of the blank 110 exposed outside the clamping part.

[0076] In some embodiments, the column includes a shell wall and a through hole formed in the shell wall and extending along the length thereof, the shell wall is formed with a plurality of through slots 23 distributed around its circumference, each through slot 23 is formed by the first end surface of the shell wall being opened toward the second end, each through slot 23 passes through the shell wall in the radial direction of the shell wall, the plurality of through slots 23 divide the first end of the shell wall into a plurality of clamping blocks 24, the plurality of clamping blocks 24 can be retracted inwardly to clamp the blank 110 when an inward force is applied from the outside, and the plurality of clamping blocks 24 release the blank 110 after the inward force is released; the plurality of clamping blocks 24 and the plurality of through slots 23 form the clamping portion;

[0077] A section of the through hole located at the clamping portion forms a contoured hole 21 that is contoured to the blank 110, a portion of the through hole located at the second end face of the shell wall forms the feed port 25, and a section of the through hole located between the feed port 25 and the clamping portion forms the feed channel 22.

[0078] Furthermore, during the feeding process of step S2, one end of the blank 110 can be connected to the feeding device, and the other end can be placed in the profiling hole 21 from the feed port 25 of the first special-shaped chuck 2a, so that the feeding effect according to demand can be achieved by presetting the parameters of the feeding device. At the same time, the profiling hole 21 is surrounded by the clamping block 24. Therefore, it is only necessary to apply pressure from the outside to the inside of the clamping block 24 to achieve the effect of clamping the blank 110 in the profiling hole 21. The device structure for applying the pressure can be a sleeve or other clamping structure. At the same time, the device for applying the pressure can be directly set on the feeding device, which is more convenient for loading the blank 110.

[0079] In some embodiments, during the milling of the inner cavity 113 of the watch strap connector 1, due to the speed limit of the spindle of the precision CNC lathe, the spindle milling cutter may be overloaded during the milling process, thereby causing the milling cutter to break. Therefore, in this embodiment, the spindle is improved and connected to the spindle through a frequency converter, so that the frequency converter can be used to adjust the spindle speed, so that the spindle speed can exceed the speed limit of the lathe itself, and then when milling the inner cavity 113 of the watch strap connector 1, the spindle drives the milling cutter at a higher speed, reducing the load on the spindle milling cutter, thereby avoiding frequent breakage of the spindle milling cutter.

[0080] S3: CNC2 machining: The cutting surface of the semi-processed watchband connector clamped by the second special-shaped chuck 2b is milled by the B-axis of the precision lathe to obtain a semi-finished watchband connector.

[0081] In this step, the B-axis is used to position the cut surface of the semi-finished watchband connector. The cut surface of the semi-finished watchband connector, gripped by the second shaped chuck 2b, is milled using the B-axis of the precision lathe. The specific processing steps include: setting the B-axis speed to 6000 rpm and the milling speed to 300 mm / min to perform rough milling on the cut surface of the semi-finished watchband connector; performing a first surface finish milling on the cut surface of the semi-finished watchband connector at a B-axis speed of 6000 rpm and a milling speed of 150 mm / min; and performing a second surface finish milling on the cut surface of the semi-finished watchband connector at a B-axis speed of 6000 rpm and a milling speed of 150 mm / min. After completing the surface milling of the cut surface of the semi-finished watchband connector, a semi-finished watchband connector is obtained, which can then be sent to a roller burnishing machine for roller polishing.

[0082] S4: Surface treatment: The surface of the semi-finished watch strap connector is subjected to rolling polishing by a rolling machine, the end face of the semi-finished watch strap connector is subjected to sandblasting by a sandblasting machine, and the semi-finished watch strap connector is subjected to PVD coating by a PVD coating device.

[0083] Specifically, the semi-processed watch strap connector obtained after the above CNC processing steps needs to be surface treated before the finished product is packaged. In this embodiment, the commonly used surface treatment methods in CNC processing are adopted, namely, roller burnishing, sandblasting and coating.

[0084] In this step, "roll-polishing the surface of the semi-finished watchband connector using a roller burnishing machine" includes setting the spindle frequency of the roller burnishing machine to 30-50 Hz, setting the forward rotation time to 10-20 minutes, and the reverse rotation time to 10-20 minutes, using chrome corundum as an abrasive and a polishing agent as a roller burnishing liquid, and roller-burnishing the outer surface and inner cavity surface of the semi-finished watchband connector. In this embodiment, the outer surface and inner cavity surface of the semi-finished watchband connector are roller-burnished in the above manner.

[0085] The “sandblasting the end surface of the semi-finished watch strap connector by a sandblasting machine” includes configuring the sandblasting machine parameters, setting the sandblasting angle to 30°~60°, the sandblasting height to 10cm+ / -2.5, and the sandblasting pressure to 1.2~1.4kg / cm 2 The nozzle swing frequency is 40~42HZ, the conveyor belt frequency is 8~12HZ, the sandblasting time is 3~6min, and the sandblasting material is zircon sand; according to the configured sandblasting machine parameters, the end face of the semi-finished watch strap connector is sandblasted.

[0086] The “performing PVD coating treatment on the semi-finished watch strap connector through PVD coating equipment” includes performing PVD coating treatment on the semi-finished watch strap connector with a coating thickness of 1.5+ / -0.3um.

[0087] In order to prevent impurities from remaining on the workpiece surface after rolling polishing and sandblasting, the present embodiment is further provided with:

[0088] S5: Cleaning, please refer to Figure 8 , this step includes the following sub-steps:

[0089] S51: Degreasing by ultrasonic and degreasing agent: using aluminum degreasing agent with a concentration of 5% to 8%, at a temperature of 55±5°, using 40Khz ultrasonic waves, degreasing the semi-finished watch strap connector for 180±30s.

[0090] S52: First rinsing: using purified water at a temperature of 55±5°, rinsing the semi-finished watch strap connector for 100±10s.

[0091] S53: Degreasing with a degreasing agent: using an aluminum degreasing agent with a concentration of 5% to 8%, degreasing the semi-finished watch strap connector again for 180±30s at a temperature of 55±5°.

[0092] S54: Rinse for the second time, using pure water at a temperature of 55±5° to rinse the semi-finished watch strap connector for 100±10s.

[0093] S55: spray cleaning, using pure water at room temperature to spray clean the semi-finished watchband connector for 60±10 seconds;

[0094] S56: Ultrasonic rinsing: using pure water and 40Khz ultrasound at a temperature of 55±5°, the semi-finished watch strap connector is cleaned for 100±10s.

[0095] S57: Slow dehydration: using pure water at a temperature of 75±5° to dehydrate the semi-finished watchband connector for 50±10 seconds.

[0096] S58: Blow dry. Blow dry the semi-finished watchband connector at room temperature for 120±10 seconds.

[0097] S59: Drying: drying the semi-finished watchband connector at a temperature of 70±5° for 400-500 seconds.

[0098] Based on the above embodiment, compared with the existing technology, the watch strap connector processing method of the present invention optimizes the three processes in the traditional technology of pre-cutting the blank into single blanks that are adapted to the shape and size of the workpiece, the need to clamp and load and unload the single blank separately during CNC1 processing, and the need to clamp and load and unload the semi-processed parts again during CNC2 processing into automatic feeding, and the CNC2 processing automatically connects the automated process of CNC1 processing.

[0099] This solution directly feeds a whole long blank 110. The first special-shaped chuck 2a cooperates with the feeding device to expose the blank 110 in the clamping portion to form a processing end. When CNC1 processes the processing end into a semi-processed watchband connector without removing the material, the contoured hole 21 of the clamping portion of the second special-shaped chuck 2b is used to position and clamp the thin wall 11 of the semi-processed watchband connector. During the entire CNC1 and CNC2 processing process, the semi-processed watchband connector is seamlessly clamped and positioned, thereby achieving automatic connection from CNC1 to CNC2 processing, thereby improving processing efficiency and reducing processing complexity. During the clamping process, because the contoured hole 21 has the same cross-sectional shape as the semi-processed watchband connector, when clamping the thin wall 11, the clamping portion can completely wrap the thin wall 11 in the circumferential direction of the thin wall 11, thereby avoiding pinching the thin wall 11. In addition, this solution also uses a frequency converter to increase the spindle speed, avoiding frequent breakage of the spindle milling cutter.

Claims

1. A method for processing a watch strap connector, characterized in that: The following steps are involved: S1: Providing a blank: providing a blank having a cross-sectional size that matches the cross-sectional size of the watch strap connector; S2: CNC1 machining: The blank is clamped and positioned by a first special-shaped chuck, the special-shaped chuck being connected to a feeding device so as to feed the blank to a spindle of a precision lathe according to a preset feeding size through the feeding device; the blank is subjected to milling and shaping of the structure of the watch band connector by the spindle, and the blank is cut by the spindle according to a preset cutting size to obtain a semi-processed watch band connector; wherein, while the blank is being cut, the semi-processed watch band connector connected to the blank is clamped by a second special-shaped chuck, the blank and the semi-processed watch band connector are clamped and positioned by the first special-shaped chuck and the second special-shaped chuck, and the connecting portion is cut to separate the semi-processed watch band connector from the blank to obtain the semi-processed watch band connector; S3: CNC2 machining: milling the cutting surface of the semi-processed watchband connector clamped by the second special-shaped chuck through the B axis of the precision lathe to obtain a semi-finished watchband connector; S4: Surface treatment: performing rolling polishing, sandblasting, and PVD coating on the surface of the semi-finished watch strap connector to obtain a finished watch strap connector; The first special-shaped chuck includes a column, a clamping portion formed at a first end of the column, a feed port formed at a second end of the column, and a material passage connected between the feed port and the clamping portion; the processed end of the blank enters the feed port and passes through the material passage to be clamped by the clamping portion, and the clamped end of the blank extends out of the clamping portion in a direction away from the feed port and is exposed outside the clamping portion; In step S1, the feeding device is controlled to feed the blank according to a preset feeding size: the feeding device is controlled to feed the blank to the first special-shaped clamp along the length direction of the first special-shaped clamp, so that the blank extends out of the clamping portion away from the feed opening after passing through the feed opening and the material passage, and the feeding is suspended when the blank extends out of the clamping portion by a predetermined distance; In step S2, when the processing end of the blank extends out of the clamping portion by a preset distance, the first special-shaped chuck clamps the blank; and CNC1 processing is performed on the processing end of the blank exposed outside the clamping portion.

2. The method for processing a watch strap connector according to claim 1, wherein: In step S1 , the cross-sectional shape of the blank is the same as that of the watchband connector, and the cross-sectional size of the blank processed is larger than the cross-sectional size of the watchband connector.

3. The method for processing a watch strap connector according to claim 1, wherein: The second special-shaped chuck has the same structure as the first special-shaped chuck.

4. The method for processing a watch strap connector according to claim 3, wherein: The column includes a shell wall and a through hole formed in the shell wall and extending along the length direction thereof, the shell wall is formed with a plurality of through slots distributed around the outer circumference thereof, each through slot is formed by facing the first end of the shell wall toward the second end, and each through slot extends through the shell wall in the radial direction of the shell wall, the plurality of through slots divide the first end of the shell wall into a plurality of clamping blocks, the plurality of clamping blocks can be retracted inwardly to clamp the blank of the column when an inward force is applied from the outside, and the plurality of clamping blocks can release the blank after the inward force is released; the plurality of clamping blocks and the plurality of through slots form the clamping portion; A section of the through hole located at the clamping portion forms a contoured hole that is contoured to the blank, a portion of the through hole located at the second end face of the shell wall forms the feed port, and a section of the through hole located between the feed port and the clamping portion forms the feed channel.

5. The method for processing a watch strap connector according to claim 1, wherein: In step S2, the main shaft is connected to a frequency converter, and the maximum speed of the main shaft is increased by the frequency converter.

6. The method for processing a watch strap connector according to claim 5, wherein: In the step of milling the blank into the structure of the watch strap connector by the spindle, and cutting the blank according to the preset cutting size by the spindle, the method includes: Groove rough milling: set the spindle speed to 28,000-50,000 rpm and the milling speed to 600-900 mm / min, and roughly mill the outer contour of the watch strap connector along the end face of the blank according to the height size and cross-sectional shape of the watch strap connector; Inner cavity fine milling: set the spindle speed to 28,000-50,000 rpm and the milling speed to 300-500 mm / min, and fine mill the inner cavity of the watch strap connector along the end face of the roughly milled outer contour according to the inner cavity depth and shape of the watch strap connector; Chamfer milling: setting the spindle speed to 5000-7000 rpm and the milling speed to 400-600 mm / min, and chamfering the end surface of the thin wall of the strap connector; Milling: Set the spindle speed to 5000-7000 rpm and the milling speed to 200-400 mm / min, and mill the hole according to the position and depth of the hole at the bottom of the inner cavity of the strap connector; Cutting, set the spindle speed to 5000~7000rpm, the milling speed to 300~500mm / min, and cut and separate the semi-processed watch strap connector that has been milled on the blank according to the height size of the watch strap connector and the preset cutting allowance.

7. The method for processing a watch strap connector according to claim 1, wherein: The steps of tumbling polishing include: The spindle frequency of the roller burnishing machine is set to 30~50Hz, the forward rotation time is set to 10~20min, and the reverse rotation time is set to 10~20min. Chrome corundum is used as an abrasive and polishing agent is used as a roller burnishing liquid to perform roller burnishing on the outer surface and inner cavity surface of the semi-finished watch strap connector.

8. The method for processing a watch strap connector according to claim 1, wherein: The sandblasting process includes: configuring the sandblasting machine parameters, setting the sandblasting angle to 30°~60°, the sandblasting height to 10cm+ / -2.5, and the sandblasting pressure to 1.2~1.4kg / cm 2 The nozzle swing frequency is 40~42HZ, the conveyor belt frequency is 8~12HZ, the sandblasting time is 3~6min, and the sandblasting material is zircon sand; according to the configured sandblasting machine parameters, the end face of the semi-finished watch strap connector is sandblasted.

9. The method for processing a watch band connector according to claim 1, wherein: The PVD coating step includes: performing PVD coating on the semi-finished watch strap connector with a coating thickness of 1.5+ / -0.3 um.

10. The method for processing a watch strap connector according to claim 1, wherein: After the rolling polishing and sandblasting steps, the method further includes a step of cleaning the semi-finished connector, which includes degreasing with an ultrasonic and degreasing agent, rinsing, degreasing with a degreasing agent, rinsing, spray cleaning, ultrasonic rinsing, slow dehydration, drying, and drying; wherein: In the ultrasonic and degreasing step, an aluminum degreasing agent with a concentration of 5% to 8% is used to degrease the semi-finished watchband connector for 180±30s at a temperature of 55±5° using 40Khz ultrasonic waves; In the rinsing step, the semi-finished watchband connector is rinsed with purified water at a temperature of 55±5° for 100±10 seconds; In the degreasing step, an aluminum degreasing agent with a concentration of 5% to 8% is used to degrease the semi-finished watchband connector again for 180±30s at a temperature of 55±5°; In the spray cleaning step, the semi-finished watchband connector is spray cleaned with purified water at room temperature for 60±10 seconds; In the ultrasonic rinsing step, the semi-finished watchband connector is cleaned for 100±10s using pure water and 40Khz ultrasonic waves at a temperature of 55±5°; In the slow dehydration step, the semi-finished watchband connector is dehydrated using pure water at a temperature of 75±5° for 50±10 seconds; In the drying step, the semi-finished watchband connector is dried at room temperature for 120±10 seconds; In the drying step, the semi-finished watchband connector is dried at a temperature of 70±5° for 400-500 seconds.

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