Watch strap connecting piece machining method

Abstract

The invention relates to the technical field of machining, and discloses a watch strap connecting piece machining method which comprises the following steps: providing a blank: providing a blank of which the section size is matched with the section size of a watch strap connecting piece; cNC1 machining is conducted, specifically, the blank is clamped and positioned through a special-shaped chuck, feeding is conducted through a feeding device, and structural milling forming of the watchband connecting piece is conducted on the blank through a main shaft; cNC2 machining, wherein the cutting face of the half-machined watchband connecting piece is milled through a B shaft; and surface treatment: carrying out rolling polishing, sand blasting treatment and PVD (Physical Vapor Deposition) coating treatment on the surface of the semi-finished product of the watchband connecting piece. According to the processing method for the watchband connecting piece of the watch, the special-shaped chuck capable of being matched with the cross section of the watchband connecting piece is used for preventing a clamp from clamping a workpiece; automatic feeding and automatic machining are achieved through the feeding device and the cooperation of the main shaft of the precision lathe and the shaft B.

Description

Technical Field

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

[0002] The metal strap of a watch is usually made up of multiple strap connectors, which are generally thin-walled metal parts with small size and hollow thin-wall structure. Therefore, it is difficult to process and usually requires high-precision equipment.

[0003] The general processing method of the strap connector is CNC processing, that is, numerical control precision machining, which uses computer digital control automated machine tools and computers to accurately control the processing process, thereby achieving high-precision strap connector processing. Its specific processing steps are generally: blank cutting-CNC1 milling-CNC2 milling-workpiece surface treatment-quality inspection-packaging. In the above CNC processing steps, due to the structural characteristics of the strap connector (having a flat end face, an opening on the bottom of the inner cavity, and a through hole on the side thin wall), the CNC processing needs to be divided into two steps. The first CNC processing mainly mills the inner cavity, opening, through hole, and thin-wall structure of the above strap connector. At the same time, according to the size of the strap connector, the semi-processed strap connector with a formed structure is cut and separated from the blank; the second CNC processing performs surface milling on the cutting surface in the first CNC step (that is, the end face of the strap connector).

[0004] However, the above two-step CNC processing 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 processing, the repeatability of the machine tool will be affected, which in turn affects the finished product size of the watch strap connector; 2. After the first CNC processing of the blank, 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 rate; 3. Two clamping positions need to be set, and each clamping position needs to be manually operated, the operation efficiency is low, and it 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 a watch strap connector to solve the problem of thin walls of the watch strap connector being pinched and dimensions being unqualified during processing.

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

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

[0008] S2: CNC1 processing: clamping and positioning the blank by a first special-shaped chuck, the special-shaped chuck is connected to a feeding device so as to feed the blank to the spindle of a precision lathe according to a preset feeding size through the feeding device; milling and shaping the blank into a structure of a watch band connector by the spindle, cutting the blank by the spindle according to a preset cutting size to obtain a semi-processed watch band connector; wherein, when cutting the blank, clamping the semi-processed watch band connector connected to the blank by a second special-shaped chuck, clamping and positioning the blank and the semi-processed watch band connector by the first special-shaped chuck and the second special-shaped chuck, cutting the connecting part so as to separate the semi-processed watch band connector from the blank, and obtaining the semi-processed watch band connector;

[0009] S3, CNC2 processing: 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;

[0010] S4: Surface treatment: The surface of the semi-finished watch strap connector is roll-polished by a rolling machine, the end face of the semi-finished watch strap connector is sandblasted by a sandblasting machine, and the semi-finished watch strap connector is PVD-coated by a PVD coating device to obtain a finished watch strap connector.

[0011] Furthermore, in step S1, the cross-sectional shape of the blank is the same as that of the watchband connector, and the cross-sectional dimension of the blank processed is larger than the cross-sectional dimension of the watchband connector.

[0012] Further, the first special-shaped chuck and the second special-shaped chuck each include 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 from the feed port and passes through the material passage and is 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;

[0013] 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 part away from the feeding port after passing through the feeding port and the material passage, and the feeding is suspended when the blank extends out of the clamping part by a predetermined distance;

[0014] In steps S2 and S3, 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 and CNC2 processing are performed on the processing end of the blank exposed outside the clamping portion.

[0015] Further, the column includes a shell wall and a through hole formed in the shell wall and penetrating along the length direction thereof, the shell wall is formed with a plurality of through grooves distributed around the outer circumference thereof, each through groove is formed by the first end surface of the shell wall opening in the direction of the second end, each through groove penetrates the shell wall along the radial direction of the shell wall, the plurality of through grooves 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 also release the blank after the inward force is released; the plurality of clamping blocks and the plurality of through grooves form the clamping portion;

[0016] A section of the through hole located at the clamping portion forms a contoured hole that conforms to the shape of the blank, a portion of the through hole located at the second end surface 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 material transfer channel.

[0017] Furthermore, in step S2, the spindle is connected to a frequency converter, and the maximum rotation speed of the spindle is increased by the frequency converter.

[0018] Furthermore, in the step of milling the blank to form the structure of the strap connector by the spindle, the step of cutting the blank according to a preset cutting size by the spindle includes:

[0019] Groove rough milling, setting the spindle speed to 28000-50000rpm, the milling speed to 600-900mm / min, and rough milling the outer contour of the strap connector along the end face of the blank according to the height size and cross-sectional shape of the strap connector;

[0020] Inner cavity fine milling, the spindle speed is set to 28000-50000rpm, the milling speed is 300-500mm / min, and the inner cavity of the watch strap connector is fine milled along the end face of the roughly milled contour according to the inner cavity depth and shape of the watch strap connector;

[0021] Chamfer milling: setting the spindle speed to 5000-7000 rpm and the milling speed to 400-600 mm / min, and chamfering the thin-walled end surface of the strap connector;

[0022] Milling holes, setting the spindle speed to 5000-7000 rpm and the milling speed to 200-400 mm / min, and milling holes according to the position and depth of the holes at the bottom of the inner cavity of the strap connector;

[0023] Cutting, setting the spindle speed to 5000-7000rpm, the milling speed to 300-500mm / min, and cutting and separating the semi-processed watch strap connector that has been milled on the blank according to the height dimension of the watch strap connector and the preset cutting allowance.

[0024] 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:

[0025] The B-axis is used to position the cutting surface of the semi-finished watchband connector; the cutting surface of the semi-finished watchband connector clamped by the special-shaped chuck is milled by the B-axis of the precision lathe.

[0026] Furthermore, in the step of rolling and polishing the surface of the semi-finished watchband connector by a rolling machine, the step includes:

[0027] The main shaft frequency of the roller burnishing machine is set to 30-50 Hz, the forward rotation time is set to 10-20 minutes, and the reverse rotation time is set to 10-20 minutes. Chrome corundum is used as an abrasive and a 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.

[0028] Further, in the step of sandblasting, the sandblasting machine parameters are configured, the sandblasting angle is set to 30° to 60°, the sandblasting height is set to 10 cm + / - 2.5, and the sandblasting pressure is set to 1.2 to 1.4 kg / cm 2 The swing frequency of the nozzle is 40-42HZ, the frequency of the conveyor belt 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 surface of the semi-finished product of the strap connector is sandblasted.

[0029] 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.

[0030] Furthermore, after the steps of rolling polishing and sandblasting, the method further includes the step of cleaning the semi-finished connector, and further includes ultrasonic and degreasing agent degreasing, rinsing, degreasing agent degreasing, rinsing, spray cleaning, ultrasonic rinsing, slow pulling dehydration, drying, and drying; wherein:

[0031] 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;

[0032] In the rinsing step, the semi-finished watchband connector is rinsed with pure water at a temperature of 55±5° for 100±10s; 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°;

[0033] In the spray cleaning step, the semi-finished watchband connector is spray cleaned with pure water at room temperature for 60±10 seconds; in the ultrasonic rinsing step, the semi-finished watchband connector is cleaned with pure water and 40Khz ultrasonic waves at a temperature of 55±5° for 100±10 seconds;

[0034] In the slow-pulling dehydration step, the semi-finished watchband connector is dehydrated for 50±10 seconds at a temperature of 75±5° using pure water;

[0035] In the drying step, the semi-finished watchband connector is dried at room temperature for 120±10 seconds;

[0036] In the drying step, the semi-finished watchband connector is dried at a temperature of 70±5° for 400 to 500 seconds.

[0037] The watch strap connector processing method of the present invention has at least the following beneficial effects: by using a special-shaped chuck that can cooperate with the cross-section of the watch strap connector, the clamping of the workpiece by the clamp is avoided; by using a feeding device and utilizing the cooperation between the spindle and the B-axis of the precision lathe, automatic loading and automatic processing are achieved; by using a frequency converter, the spindle speed is increased to avoid frequent breakage of the spindle milling cutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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:

[0039] Figure 1 It is a structural schematic diagram of a watch strap connector of the present invention;

[0040] Figure 2 It is a flowchart of a method for processing a watch strap connector of the present invention;

[0041] Figure 3 It is a flow chart of CNC1 processing in the watch strap connector processing method of the present invention;

[0042] Figure 4 It is a schematic diagram of the structure of the blank after the groove rough milling;

[0043] Figure 5 It is a schematic diagram of the structure of the blank after the inner cavity is finely milled;

[0044] Figure 6 It is a schematic diagram of the structure of the blank after chamfering milling;

[0045] Figure 7 It is a schematic diagram of the structure of the blank after milling;

[0046] Figure 8 A flow chart of the cleaning process in the processing method of the present invention;

[0047] Fig. 9 It is a schematic structural diagram of a first special-shaped chuck of the present invention;

[0048] Fig.10 A view of the first special-shaped chuck in the clamping end direction of the present invention;

[0049] Fig.11 It is a schematic diagram of the structure when a special-shaped chuck blank is clamped;

[0050] Fig.12 This is a schematic diagram of the structure in which the second special-shaped clamp clamps the thin wall of the semi-finished watchband connector.

[0051] The meanings of the symbols in the accompanying drawings are:

[0052] Watchband connector-1; thin wall-11; through hole-12; opening-13; first special-shaped clamp-2a; second special-shaped clamp-2b; contour hole-21; material passage-22; through groove-23; clamping block-24; material feed port-25;

[0053] Blank-110; shallow groove-111; deep groove-112; inner cavity-113; thin-wall end face-114; thin-wall chamfer-115;. DETAILED DESCRIPTION

[0054] The present invention will be further described below in conjunction with the accompanying drawings.

[0055] like Figures 1 to 12 As shown, the present invention provides a method for processing a watch band connector. The method is aimed at processing a special component, the watch band connector, and also involves a special-shaped chuck that matches the shape of the watch band connector.

[0056] like Figure 1As shown, the specific structure of the strap connector 1 of the present invention is a cylinder formed by stretching a cylinder radially along the end surface, and one end of the cylinder has a flat end surface, and the other end has an inner cavity 113, the bottom surface of the inner cavity 113 has an opening 13, and the thin wall 11 has a through hole 12. At the same time, in this embodiment, the size of the strap connector 1 is L×W×H: 5.2×1.93×1.8, that is, its length, width and height are: 5.2mm, 1.93mm, and 1.8mm respectively.

[0057] like Figure 2 and Figure 3 As shown, the watch strap connector processing method of the present invention comprises the following steps:

[0058] S1: Providing a blank 110: Providing a blank 110 whose cross-sectional dimensions match those of the strap connector 1.

[0059] In step S1, the size and shape of the blank 110 are designed according to the size of the strap connector 1. Specifically, the blank 110 is a long strip of steel. By milling and cutting the blank 110, a semi-finished strap connector can be obtained. The shape of its cross section is the same as that of the strap connector 1, which is convenient for milling positioning. At the same time, its cross-sectional size is larger than that of the strap connector 1 to ensure that a margin is reserved in size, which is convenient for subsequent milling processing. In this embodiment, the specific size of the blank 110 can be set to L×W×H: 5.4×2.1×1500, that is, its length, width and height are: 5.4mm, 2.1mm, 1500mm respectively, and its material can be 316 steel.

[0060] 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.

[0061] Specifically, in the present embodiment, CNC machining can be performed using a group of precision CNC lathes, and the main process of CNC1 machining is to perform structural milling and cutting of the watchband connector 1 on the blank 110 by a spindle milling cutter.

[0062] Please refer to Figure 3 , this step S2 may specifically include the following steps:

[0063] S21: Groove rough milling, setting the spindle speed to 28000-50000 rpm, the milling speed to 600-900 mm / min, and rough milling the outer contour of the strap connector 1 along the end surface of the blank 110 according to the height dimension and cross-sectional shape of the strap connector 1;

[0064] Please refer to Figure 4 In this step, a spindle milling cutter is used to mill a shallow groove 111 and a deep groove 112 from the end surface of the blank 110 along the axial direction of the blank 110 .

[0065] S22: inner cavity fine milling, setting the spindle speed to 28000-50000 rpm, the milling speed to 300-500 mm / min, and fine milling the inner cavity 113 of the watch strap connector 1 along the end surface of the roughly milled outer contour according to the depth and shape of the inner cavity 113 of the watch strap connector 1;

[0066] Please refer to Figure 5 In this step, the spindle milling cutter is used to mill the inner cavity 113 inward from the above-mentioned shallow groove 111 along the axial direction of the blank 110, and at the same time, an opening 13 is milled out at a preset position on the bottom surface of the inner cavity 113. At this time, a thin wall 11 is formed between the deep groove 112 and the inner cavity 113.

[0067] S23: Chamfering milling, setting the spindle speed to 5000-7000 rpm and the milling speed to 400-600 mm / min, and performing chamfering milling on the end surface of the thin wall 11 of the strap connector 1;

[0068] Please refer to Figure 6 In this step, the end face of the thin wall 11, that is, the thin wall end face 114, is chamfered by a spindle milling cutter to form a thin wall chamfer 115.

[0069] S24: milling a hole, setting the spindle speed to 5000-7000 rpm and the milling speed to 200-400 mm / min, and milling the hole 13 according to the position and depth of the bottom opening 13 of the inner cavity 113 of the strap connector 1;

[0070] Please refer to Figure 6 In this step, a through hole 12 is milled on the thin wall 11 along its length direction by a spindle milling cutter.

[0071] S25: Cutting, setting the spindle speed to 5000-7000 rpm and the milling speed to 300-500 mm / min, cutting and separating the semi-processed watch strap connector that has been milled on the blank 110 according to the height dimension of the watch strap connector 1 and the preset cutting margin.

[0072] After the above-mentioned four processing steps of groove rough milling - inner cavity fine milling - chamfer milling - milling, the semi-processed watch strap connector is completely formed on the blank 110. At this time, it only needs to be cut and separated from the blank 110 along the surface of the deep groove 112 to allow it to enter the subsequent surface treatment process. In this step, according to the height dimension of the watch strap connector 1 and the preset section allowance, the spindle speed is set to 5000-7000rpm and the milling speed is 300-500mm / min. Preferably, the spindle speed is set to 6000rpm and the milling speed is 400mm / min, so as to cut and separate the semi-processed watch strap connector that has been milled on the blank 110.

[0073] It is worth mentioning that conventional CNC1 processing ends after cutting is completed, and the workpiece needs to be clamped separately to enter CNC2 processing. However, in order to achieve fully automatic loading and automatic CNC1-CNC2 processing, before entering CNC2 processing, since the semi-processed watch band connector is cut and separated from the blank 110 by the main shaft, in order to connect the CNC1 and CNC2 processing processes, this embodiment also provides a second special-shaped chuck 2b at the B-axis end of the precision lathe. Before completing the operation of cutting and separating the semi-processed watch band connector from the blank 110, it is necessary to use the second special-shaped chuck 2b to position the inner cavity 113 of the semi-processed watch band connector, and at the same time use the contoured hole 21 to clamp the side wall of the semi-processed watch band connector, that is, the thin wall 11, so as to facilitate the B-axis to perform surface milling on the cut surface of the semi-processed watch band connector. Since the cross-sectional shape of the profiling hole 21 is the same as that of the semi-processed watchband connector, the profiling hole 21 can completely wrap the thin wall 11 during clamping, thereby preventing the thin wall 11 from being clamped during the clamping process.

[0074] 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 completely the same. Specifically, the first special-shaped chuck 2a and the second special-shaped chuck 2b both 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 processed 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 the end of the feed port 25 after passing through the feed port 25 and the feed passage 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.

[0075] In some embodiments, the column includes a shell wall and a through hole formed in the shell wall and penetrating along the length direction thereof, the shell wall is formed with a plurality of through grooves 23 distributed around its periphery, each through groove 23 is formed by the first end surface of the shell wall opening in the direction of the second end, each through groove 23 penetrates the shell wall along the radial direction of the shell wall, the plurality of through grooves 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 of the column when an inward force is applied from the outside, and the plurality of clamping blocks 24 also release the blank 110 after the inward force is released; the plurality of clamping blocks 24 and the plurality of through grooves 23 form the clamping portion;

[0076] A section of the through hole located at the clamping portion forms a contoured hole 21 that is contoured with the blank 110, a portion of the through hole located at the second end surface 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 passage 22.

[0077] 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 on 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 outer side to the inner side 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.

[0078] 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 via 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, thereby reducing the load on the spindle milling cutter and avoiding frequent breakage of the spindle milling cutter.

[0079] 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.

[0080] In this step, the B-axis is used to position the cutting surface of the semi-processed watchband connector; 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. The specific processing includes the following steps: setting the B-axis speed to 6000rmp and the milling speed to 300mm / min, and rough milling the cutting surface of the semi-processed watchband connector; the first surface finishing milling, setting the B-axis speed to 6000rmp and the milling speed to 150mm / min, and performing the first surface finishing milling on the cutting surface of the semi-processed watchband connector; setting the B-axis speed to 6000rmp and the milling speed to 150mm / min, and performing the second surface finishing milling on the cutting surface of the semi-processed watchband connector. After completing the surface milling of the cutting surface of the semi-processed watchband connector, a semi-finished watchband connector is obtained, and the semi-finished watchband connector can be sent to a rolling machine for rolling polishing.

[0081] 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.

[0082] 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, rolling treatment, sandblasting treatment and coating treatment.

[0083] In this step, the "rolling and polishing the surface of the semi-finished watch band connector by a rolling machine" includes setting the spindle frequency of the rolling 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 rolling liquid to roll the outer surface and inner cavity surface of the semi-finished watch band connector. In this embodiment, the outer surface and inner cavity surface of the semi-finished watch band connector are rolled in the above manner.

[0084] 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° to 60°, the sandblasting height to 10 cm+ / -2.5, and the sandblasting pressure to 1.2 to 1.4 kg / cm 2 The swing frequency of the nozzle is 40-42HZ, the frequency of the conveyor belt 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 surface of the semi-finished product of the strap connector is sandblasted.

[0085] 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.

[0086] In order to prevent impurities from remaining on the workpiece surface after rolling polishing and sandblasting, the present embodiment is also provided with:

[0087] S5: Cleaning treatment, please refer to Figure 8 , this step includes the following sub-steps:

[0088] S51: Degreasing by ultrasonic and degreasing agent, using an aluminum degreasing agent with a concentration of 5% to 8%, at a temperature of 55±5°, using 40Khz ultrasonic waves, to degrease the semi-finished product of the strap connector for 180±30s.

[0089] S52: First rinsing: using pure water at a temperature of 55±5° to rinse the semi-finished watch strap connector for 100±10s.

[0090] S53: Degreasing with a degreasing agent: using an aluminum degreasing agent with a concentration of 5% to 8%, and degreasing the semi-finished watch strap connector again for 180±30s at a temperature of 55±5°.

[0091] 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.

[0092] S55: spray cleaning, using pure water to spray clean the semi-finished watch strap connector at room temperature for 60±10s;

[0093] S56: Ultrasonic rinsing: using pure water and 40Khz ultrasound at a temperature of 55±5° to clean the semi-finished watch strap connector for 100±10s.

[0094] S57: Slow dehydration: using pure water at a temperature of 75±5° to dehydrate the semi-finished watch strap connector for 50±10s.

[0095] S58: Blow-drying: Blow-drying the semi-finished watchband connector at room temperature for 120±10 seconds.

[0096] S59: Drying: drying the semi-finished watch strap connector at a temperature of 70±5° for 400 to 500 seconds.

[0097] Based on the above embodiments, compared with the prior art, 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 match the shape and size of the workpiece, clamping and unloading the single blank separately during CNC1 processing, and clamping and unloading the semi-processed parts again during CNC2 processing into automatic feeding, and the CNC2 processing automatically connects the automated process of CNC1 processing.

[0098] This solution directly feeds a whole long blank 110, and the first special-shaped chuck 2a cooperates with the feeding device to expose the blank 110 to the clamping part to form a processing end. When CNC1 processes the processing end into a node of a semi-processed watchband connector without stripping, the thin wall 11 of the semi-processed watchband connector is positioned and clamped by the profiling hole 21 of the clamping part of the second special-shaped chuck 2b, so that the semi-processed watchband connector is seamlessly clamped and positioned during the entire CNC1 and CNC2 processing process, thereby realizing the automatic connection of the CNC1 to CNC2 processing process, thereby improving the processing efficiency and reducing the processing complexity; and in the clamping process, since the profiling hole 21 has the same cross-sectional shape as the semi-processed watchband connector, when the thin wall 11 is clamped, the clamping part can completely wrap the thin wall 11 in the circumferential direction of the thin wall 11, thereby avoiding the clamping of the thin wall 11. In addition, this solution also uses a frequency converter to increase the spindle speed and avoid 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 matching that of the strap connector; S2: CNC1 processing: clamping and positioning the blank by using a first special-shaped chuck; milling and forming the structure of the watch band connector on the blank by using the spindle of a precision lathe, cutting the blank by using the spindle according to a preset cutting size to obtain a semi-processed watch band connector; wherein, when cutting the blank, clamping the semi-processed watch band connector connected to the blank by using a second special-shaped chuck, clamping and positioning the blank and the semi-processed watch band connector by using the first special-shaped chuck and the second special-shaped chuck, cutting the connecting part to separate the semi-processed watch band connector from the blank, and obtaining 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: rolling polishing, sandblasting and PVD coating are performed on the surface of the semi-finished watch strap connector to obtain a finished watch strap connector.

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

3. The method for processing a watch strap connector according to claim 1, characterized in that: The first special-shaped chuck and the second special-shaped chuck both include 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 from the feed port and passes through the material passage and is 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 part away from the feeding port after passing through the feeding port and the material passage, and the feeding is suspended when the blank extends out of the clamping part by a predetermined distance; In steps S2 and S3, 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 and CNC2 processing are performed on the processing end of the blank exposed outside the clamping portion.

4. The method for processing a watch strap connector according to claim 3, characterized in that: The column comprises a shell wall and a through hole formed in the shell wall and penetrating along the length direction thereof, the shell wall is formed with a plurality of through grooves distributed around the outer circumference thereof, each through groove is formed by opening from the first end surface of the shell wall toward the second end, each through groove penetrates the shell wall along the radial direction of the shell wall, the plurality of through grooves 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 also release the blank after the inward force is released; the plurality of clamping blocks and the plurality of through grooves form the clamping portion; A section of the through hole located at the clamping portion forms a contoured hole that conforms to the shape of the blank, a portion of the through hole located at the second end surface 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 material transfer channel.

5. The method for processing a watch strap connector according to claim 1, characterized in that: In step S2, the spindle is connected to a frequency converter, and the maximum rotation speed of the spindle is increased by the frequency converter.

6. The method for processing a watch strap connector according to claim 5, characterized in that: In the step of milling the blank into the structure of the strap connector by the spindle, the step of cutting the blank according to the preset cutting size by the spindle includes: Groove rough milling, setting the spindle speed to 28000-50000rpm, the milling speed to 600-900mm / min, and rough milling the outer contour of the strap connector along the end face of the blank according to the height size and cross-sectional shape of the strap connector; Inner cavity fine milling, the spindle speed is set to 28000-50000rpm, the milling speed is 300-500mm / min, and the inner cavity of the watch strap connector is fine milled along the end face of the roughly milled 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 thin-walled end surface of the strap connector; Milling holes, setting the spindle speed to 5000-7000 rpm and the milling speed to 200-400 mm / min, and milling holes according to the position and depth of the holes at the bottom of the inner cavity of the strap connector; Cutting, setting the spindle speed to 5000-7000rpm, the milling speed to 300-500mm / min, and cutting and separating the semi-processed watch strap connector that has been milled on the blank according to the height dimension of the watch strap connector and the preset cutting allowance.

7. The method for processing a watch strap connector according to claim 1, characterized in that: The steps of rolling polishing include: The main shaft frequency of the roller burnishing machine is set to 30-50 Hz, the forward rotation time is set to 10-20 minutes, and the reverse rotation time is set to 10-20 minutes. Chrome corundum is used as an abrasive and a 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, characterized in that: The sandblasting process includes: configuring the sandblasting machine parameters, setting the sandblasting angle to 30° to 60°, the sandblasting height to 10cm+ / -2.5, and the sandblasting pressure to 1.2 to 1.4kg / cm 2 The swing frequency of the nozzle is 40-42HZ, the frequency of the conveyor belt 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 surface of the semi-finished product of the strap connector is sandblasted.

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

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

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