Method for manufacturing locally-thinned metal workpiece

Abstract

The invention discloses a method for manufacturing a locally-thinned metal workpiece, which comprises the following steps of: dividing a workpiece forming area on a material belt, and forming a positioning hole; insulating films are pasted on the front face and the back face of the material belt respectively; carrying out die cutting on the material belt to remove the insulating film in a preset area to form a windowing area; the windowing area of the material belt is etched and thinned; removing the insulating film on the material belt; and a finished product of the metal workpiece is manufactured on the material belt. According to the automatic production line, the production process of the metal workpiece can be automatically and continuously carried out by adjusting the process and optimizing the process sequence, the single metal workpiece does not need to be manually machined, the production efficiency is greatly improved, and the production cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of metal workpiece manufacturing, and in particular relates to a method for manufacturing a locally thinned metal workpiece. Background Art

[0002] Metal workpieces are generally made of material strips through sequential stamping on an assembly line. Some small metal workpieces are used to reinforce components in products such as mobile phones. In order to meet the reinforcement requirements of the components, harder and thicker stainless steel materials (such as SUS316L 3 / 4H, T0.2) are used. In addition, due to the structural space requirements of products such as mobile phones, it is often necessary to locally thin the metal workpiece (if the overall thinning material will affect the strength of the metal workpiece). Since the material of the metal workpiece is relatively hard, it is difficult to achieve the purpose of local thinning by stamping and extrusion. Therefore, the metal workpiece is first processed and formed, and then the metal workpiece is protected by baking paint. The area to be thinned is locally laser engraved and then the area is etched and thinned, and finally the paint is removed. However, the above-mentioned thinning process is relatively complicated and requires processing operations on discrete individual metal workpieces. The operation steps are cumbersome and inefficient. Summary of the Invention

[0003] 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 manufacturing a locally thinned metal workpiece.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A method for manufacturing a locally thinned metal workpiece comprises the following steps:

[0006] S100, dividing the workpiece forming area on the material strip and forming positioning holes;

[0007] S200, attaching insulating films to the front and back of the material strip respectively;

[0008] S300, die-cutting and removing the insulating film in a predetermined area on the material strip to form a window area;

[0009] S400, etching and thinning the window area of ​​the strip;

[0010] S500, removing the insulating film on the material strip;

[0011] S600: A finished metal workpiece is produced on the material strip.

[0012] Furthermore, in the step S100, the positioning holes include a first positioning hole and a second positioning hole arranged in sequence along the conveying direction of the material belt, the center distance between two adjacent first positioning holes is equal to the center distance between two adjacent workpiece forming areas, and the center distance between two adjacent second positioning holes is equal to the conveying step distance of the material belt.

[0013] Furthermore, in the step S200, the width of the insulating film is greater than the width of the material strip, so that the insulating films on the front and back sides of the material strip are bonded to each other in the thickness direction of the material strip.

[0014] Furthermore, in the step S300, the window area includes the area on the material strip that needs to be thinned after the metal workpiece is formed, and does not include the remaining area on the material strip used to form the metal workpiece.

[0015] Furthermore, the step S600 includes the following sub-steps:

[0016] S610, removing waste material around the area requiring stamping and bending in the workpiece forming area, and forming structural features other than the bending of the metal workpiece;

[0017] S620, forming a bending structural feature of the metal workpiece in a forming area of ​​the workpiece by stamping and bending;

[0018] S630: Select an area at one end of the metal workpiece as a connection area between the metal workpiece and the material strip, and remove waste material around the metal workpiece except for the connection area; thereby forming an upper narrow strip structure on the upper portion of the material strip, and forming a metal workpiece below the upper narrow strip structure, wherein the metal workpiece is connected to the upper narrow strip structure via the connection area.

[0019] S640, adjusting the shape of the strip to reduce or eliminate the curvature of the strip;

[0020] S650, performing electroplating treatment on the metal workpiece to obtain a finished metal workpiece;

[0021] S660, cutting the finished metal workpiece from the material strip.

[0022] Furthermore, the metal workpiece includes a main body portion, a bent portion and a thinning portion, and the main body portion and the thinning portion are connected by the bent portion;

[0023] The workpiece forming area includes a main body area for forming a main body part, a bending area for forming a bending part, a thinning area for forming a thinning part, and a waste area located around the above areas; in the S610 step, the area that needs to be stamped and bent includes the bending area and the thinning area.

[0024] Furthermore, the step S610 includes the following sub-steps:

[0025] S611, sequentially removing waste material from a first cutting area in each workpiece forming area by punching, wherein the first cutting area is used to remove waste material areas on the left and lower left sides of the bending area and the thinning area;

[0026] S612, sequentially removing waste material from a second cutting area in each workpiece forming area by punching, wherein the second cutting area is used to remove waste material areas on the right side and lower right side of the bending area and the thinning area, and the first cutting area and the second cutting area have an overlapping area below the thinning portion;

[0027] S613, processing the burrs at the punching and cutting positions outside the waste area in the forming area of ​​the workpiece.

[0028] Furthermore, the step S620 includes the following sub-steps:

[0029] S621, bending the bent region and the thinned region by a first punching operation, and making the angle between the bent region and the thinned region approach or reach the angle between the bent portion and the thinned portion;

[0030] S622, the bending area is further bent by a second punching operation, and the angle between the bending area and the main body area is close to or reaches the angle between the bending portion and the main body;

[0031] S623. Fine-tune the angle between the bending area and the main area and the angle between the bending area and the thinning area by a third punching to form a bending portion and a thinning portion.

[0032] Furthermore, in the step S630, a strip area is selected at the upper end of the metal workpiece as a connection area between the metal workpiece and the material strip; a predetermined width of edge material is cut off at the upper end of the upper narrow strip structure, and a special-shaped structure is formed at the cut of the upper narrow strip structure;

[0033] In the step S640, the method for adjusting the shape of the material strip is: according to the bending direction of the upper narrow strip structure, vertical strip-shaped depressions are formed at intervals on the upper or lower part of the upper narrow strip structure by punching.

[0034] Furthermore, the special-shaped structure is a dovetail groove, and the vertical strip-shaped recess is located on the central axis of the dovetail groove on the upper narrow band structure.

[0035] In the present invention, the electrophoresis process is replaced by a covering insulating film process, eliminating the need for paint baking and the need for hangers. Furthermore, the laser engraving process for removing paint is replaced by an insulating film die-cutting process, eliminating the need for jig positioning, saving process costs and reducing process difficulty. Furthermore, through the aforementioned process adjustments, the process sequence can be further optimized, employing etching thinning followed by stamping, so that the production process of metal workpieces can be automated and continuous on the material strip. That is, the production of metal workpieces can be automatically completed through the assembly line operation of the material strip, without the need for manual processing of individual metal workpieces, greatly improving production efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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:

[0037] Figure 1 This is a schematic diagram of the structure of a locally thinned metal reinforcement sheet.

[0038] Figure 2 This is a schematic diagram of the metal reinforcement sheet after being covered with paint for masking.

[0039] Figure 3 This is a schematic diagram of the metal reinforcement plate after paint is removed from a local area through laser engraving.

[0040] Figure 4 This is the left view after the metal reinforcement sheet is placed in the corrosive solution for etching and thinning.

[0041] Figure 5 This is a flow chart of an embodiment of a method for manufacturing a locally thinned metal workpiece according to the present invention.

[0042] Figure 6 Schematic diagram of dividing the workpiece forming area on the material strip.

[0043] Figure 7 This is a schematic diagram of the process after attaching an insulating film to the material strip and die-cutting to form a window area.

[0044] Figure 8 This is a schematic diagram after removing the insulating film on the tape.

[0045] Figure 9 This is a schematic diagram after the waste material in the first cutting area is cut off.

[0046] Figure 10 This is a schematic diagram after the waste material in the second cutting area is cut off.

[0047] Figure 11 Schematic diagram of the first chamfered area and the second chamfered area.

[0048] Figure 12 Schematic diagram of three-step stamping and bending.

[0049] Figure 13 This is the left view of the workpiece forming area after the first stamping and bending.

[0050] Figure 14 This is the left view of the workpiece forming area after the second stamping and bending.

[0051] Figure 15 Schematic diagram of the third cut-away area, the fourth cut-away area, and the fifth cut-away area.

[0052] Figure 16 Schematic diagram of the third chamfer area and linear punching position.

[0053] The accompanying drawings in this specification are numeraled as follows:

[0054] Material strip 100; first positioning hole 101; second positioning hole 102; recessed area 103; workpiece forming area 110; main body area 111; bending area 112; thinning area 113; waste area 114; connecting area 115; first cut-out areas 121, 122; second cut-out areas 131, 132; overlapping area 140; third cut-out area 151; fourth cut-out area 152; fifth cut-out area 153; upper narrow strip structure 160; lower narrow strip structure 170; dovetail grooves 161, 171; first vertical strip-shaped recess 181; second vertical strip-shaped recess 182;

[0055] Insulating film 200; window area 201; first chamfered area 311; second chamfered area 312; third chamfered area 312; first stamping and bending area 321; second stamping and bending area 322; third stamping and bending area 323; first linear stamping position 331; second linear stamping position 332;

[0056] Paint-800; metal reinforcement sheet-900; main body-910; through hole-911; directional arrow-912; bent portion-920; thinned portion-930; arc-shaped notch-931; convex bulge-932. DETAILED DESCRIPTION

[0057] The following describes the implementation of the present invention through specific examples. The illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention. The following embodiments and features in the embodiments may be combined with each other unless there is any conflict.

[0058] See also Figure 1, is a schematic diagram of the structure of a locally thinned metal workpiece. The metal workpiece is a metal reinforcement sheet 900 for an internal component of a mobile phone. It includes a main portion 910, a bent portion 920, and a thinned portion 930. The main portion 910 and the thinned portion 930 are connected by the bent portion 920. The main portion 910 is provided with a through hole 911, and a directional arrow 912 is provided on the front of the main portion 910. The thinned portion 930 has an inwardly concave arc-shaped notch 931 formed on the first side, and two protrusions 932 are provided on the thinned portion 930 on one side of the arc-shaped notch 931. The thickness of the main portion 910 and the bent portion 920 is 0.2 mm. The thickness of the thinned portion 930 is smaller than that of the main portion 910 and the bent portion 920, at 0.15 mm. The metal reinforcing sheet 900 is made of stainless steel (SUS316L 3 / 4H, T0.2). Since the material is relatively hard, it is not possible to locally thin the sheet from 0.2 mm to 0.15 mm by punching and extrusion. Therefore, an etching thinning process is used to thin the thinning portion 930 by 0.05 mm.

[0059] The existing processing technology is limited by the conditions of electrophoresis and other processes. It is impossible to use the material strip 100 for assembly line processing. It can only operate on a single metal workpiece. The processing process is: first, the material strip 100 is obtained by stamping and forming. Figure 1 Single metal reinforcement sheet 900. Then, refer to Figure 2 , put the metal reinforcing sheet 900 into the paint 800, and cover the surface of the metal reinforcing sheet 900 with a layer of paint 800 by full-circle electrophoresis and baking for masking. Figure 3 , remove the paint 800 by laser engraving in the local area where the metal reinforcement sheet 900 needs to be etched and thinned. Figure 4 The metal reinforcement sheet 900 is placed in a corrosive solution for etching, thinning the area where the paint 800 was removed by laser engraving, and thinning the thinned portion 930 to 0.15mm. Finally, the metal reinforcement sheet 900 is removed, the paint 800 on its surface is removed, and electroplating is performed.

[0060] The aforementioned processes require a hanger for electrophoresis and a jig for positioning for laser engraving, making them complex. Furthermore, due to the limitations of the full-circle electrophoresis process, these processes can only be performed on a single metal reinforcement sheet (900). This results in cumbersome operations, low efficiency, and high costs.

[0061] See also Figure 5 , Figure 5 This is a flow chart of an embodiment of a method for manufacturing a locally thinned metal workpiece according to the present invention. The method for manufacturing a locally thinned metal workpiece according to this embodiment includes the following steps:

[0062] S100, please refer to Figure 6, divide the workpiece forming area 110 on the material belt 100 according to the size of the metal workpiece, and punch positioning holes according to the spacing between adjacent workpiece forming areas 110. The positioning holes may include a first positioning hole 101 and a second positioning hole 102 that are sequentially arranged along the conveying direction of the material belt 100. For example, the first positioning holes 101 may be sequentially arranged at the upper part of the material belt 100 along the conveying direction of the material belt 100, and the second positioning holes 102 may be sequentially arranged at the lower part of the material belt 100 along the conveying direction of the material belt 100. It should be noted that the upper part and the lower part in this embodiment are for Figure 6 The orientation in the figure is used to describe the orientation of the strip 100, rather than to indicate the orientation of the strip 100 during processing.

[0063] The center distance between two adjacent first positioning holes 101 is generally equal to the center distance between two adjacent workpiece forming areas 110, so as to facilitate positioning of the workpiece forming areas 110. The center distance between two adjacent second positioning holes 102 is generally equal to the conveying pitch of the material strip 100, so as to facilitate positioning of the conveying pitch.

[0064] by Figure 1 Taking the metal reinforcing sheet 900 in the example, since its width is small, less than half of the conveying step of the material belt 100, half of the conveying step of the material belt 100 can be used as the width of the workpiece forming area 110, and the material belt 100 can be divided into several workpiece forming areas 110. Figure 6 The dashed line in the figure is the dividing line that demarcates the workpiece forming area 110. Of course, the workpiece forming area 110 is only theoretically divided to facilitate positioning during processing, and the dividing line does not need to be actually drawn on the material strip 100. The workpiece forming area 110 includes a main body area 111 for forming the main body portion 910, a bending area 112 for forming the bending portion 920, a thinning area 113 for forming the thinning portion 930, and a waste area 114 located around these areas.

[0065] S200, please refer to Figure 7 Insulating films 200 are applied to the front and back of the strip 100 to protect the strip 100 during the subsequent etching process. The width of the insulating films 200 is generally slightly larger than the width of the strip 100, so that the insulating films 200 on the front and back of the strip 100 adhere to each other in the thickness direction of the strip 100, protecting the strip 100 all around.

[0066] S300, please continue to read Figure 7, the insulating film 200 in a predetermined area is removed from the material strip 100 by die cutting to form a window area 201. The window area 201 needs to include the area on the material strip 100 that needs to be thinned after the metal workpiece is formed, and does not include the remaining area on the material strip 100 used to form the metal workpiece. That is, the window area 201 is determined by the position where the product needs to be thinned, and can be on the front side of the material strip 100, or on the back side of the material strip 100. If necessary, the window area 201 can also be formed on both the front and back sides of the material strip 100. Figure 1 Taking the metal reinforcement sheet 900 in the example, the insulating film 200 needs to be removed above the thinning area 113 on the material strip 100 for forming the thinning portion 930, and its surface is exposed through the window area 201, and the main area 111 and the bending area 112 on the material strip 100 for forming the main body 910 and the bending portion 920 need to be covered under the insulating film 200 for protection; there is no requirement for the waste area 114, which can be decided according to specific circumstances.

[0067] S400, etching and thinning the window area 201 of the strip 100. The strip 100 can be passed through an etching tank filled with an etching solution. Since the window area 201 on the front of the strip 100 is exposed, a portion of it will be etched away, thereby becoming thinner; the rest of the strip 100 is protected by the insulating film 200 and will not be etched. Figure 1 Taking the metal reinforcing sheet 900 in FIG. 1 as an example, by controlling the etching process, the thickness of the material strip 100 at the window portion is etched from 0.2 mm to 0.15 mm. The specific etching process is prior art and will not be described in detail here.

[0068] S500, please refer to Figure 8 , remove the insulating film 200 on the material strip 100 (i.e., the insulating film 200 on the front and back of the material strip 100) to facilitate the subsequent stamping process. At this time, the window area 201 is thinned by etching, forming a recessed area 103 of the corresponding shape.

[0069] S600: Produce a finished metal workpiece on the material strip 100. This step may include the following sub-steps:

[0070] S610, cutting away the waste material around the area that needs to be stamped and bent in the workpiece forming area 110, so as to facilitate the subsequent stamping and forming, and forming the structural features of the metal workpiece other than the bending (excluding the edge shape features of the metal workpiece). Figure 1 Taking the metal reinforcement sheet 900 in FIG. 1 as an example, in this step, it is necessary to remove the waste around the bending area 112 and the thinning area 113, and form the through hole 911, the pointing arrow 912, the arc-shaped notch 931 and the convex hull 932. The above process may include the following sub-steps:

[0071] S611, please refer to Figure 9 , in each workpiece forming area 110, the waste material in the first cut-out area (121, 122) is cut off by punching in turn. The first cut-out area (121, 122) is used to remove the waste material area 114 on the left and lower left sides of the bending area 112 and the thinning area 113, thereby forming an arc-shaped notch 931. Since one conveying step of the material strip 100 corresponds to two workpiece forming areas 110, it is necessary to set two punching stations for cutting off the waste material in the first cut-out area (121, 122), one for cutting off the waste material in the first cut-out area 121 of the odd-numbered workpiece forming areas 110, and the other for cutting off the waste material in the first cut-out area 122 of the even-numbered workpiece forming areas 110. Since the first cutting area (121, 122) is located below the material strip 100, in the gap of the above-mentioned cutting process, two stamping stations can also be used above the material strip 100 to form pointing arrows 912 in the odd-numbered workpiece forming area 110 and the even-numbered workpiece forming area 110 respectively.

[0072] S612, please refer to Figure 10 , in turn, in each workpiece forming area 110, the waste material of the second cut-out area (131, 132) is cut off by punching, and the second cut-out area (131, 132) is used to remove the waste material area 114 on the right side and the lower right side of the bending area 112 and the thinning area 113. The first cut-out area (121, 122) and the second cut-out area (131, 132) have an overlapping area 140 below the thinning portion 930 to ensure that the lower part of the thinning area 113 is separated from the material strip 100. At this time, a lower narrow band structure 170 is formed below the material strip 100. Similarly, in this step, two punching stations for cutting off the waste material of the second cut-out area (131, 132) are also required, one for cutting off the waste material of the second cut-out area 131 of the odd-numbered workpiece forming area 110, and the other for cutting off the waste material of the second cut-out area 132 of the even-numbered workpiece forming area 110. Since the second cutting area (131, 132) is located below the material strip 100, in the gap of the above-mentioned cutting process, through holes 911 can be formed in the odd-numbered workpiece forming area 110 and the even-numbered workpiece forming area 110 above the material strip 100 through two stamping stations.

[0073] S613, please refer to Figure 11The burrs at the stamped and removed locations outside the waste area 114 in the workpiece forming area 110 are processed. First, the first chamfered area 311 can be chamfered by stamping at a location below the corresponding strip 100 to remove burrs from the edges of the bend area 112 and the thinned area 113. Then, the second chamfered area 312 can be chamfered by stamping at a location above the corresponding strip 100 to remove burrs around the through hole 911. Subsequently, two convex bumps 932 can be formed in the thinned area 113 by stamping.

[0074] S620 , forming a bending structural feature of the metal workpiece in the workpiece forming area 110 by stamping and bending.

[0075] Still Figure 1 Taking the metal reinforcement sheet 900 in FIG. 1 as an example, this step may include the following sub-steps:

[0076] S621, please refer to Figure 12 The first punching process causes both the bending region 112 and the thinned region 113 to be bent, and the angle between the bending region 112 and the thinned region 113 is close to or equal to the angle between the bending portion 920 and the thinned portion 930; the angle between the bending region 112 and the main region 111 can be greater than the angle between the bending portion 920 and the main portion 910. Figure 13 For example, through this step, the angle between the bending region 112 and the main region 111 can be close to or reach 125°, and the angle between the bending region 112 and the thinning region 113 can be close to or reach 95°.

[0077] S622, please continue reading Figure 12 The second punching process causes the bending region 112 to continue to bend, and the angle between the bending region 112 and the main body region 111 approaches or reaches the angle between the bending portion 920 and the main body portion 910. Figure 14 For example, through this step, the angle between the bending area 112 and the main body area 111 can be close to or reach 95°.

[0078] S623, please continue reading Figure 12 Through the third stamping, the angle between the bending area 112 and the main area 111 and the angle between the bending area 112 and the thinning area 113 are fine-tuned so that the angle between the bending area 112 and the main area 111 and the angle between the bending area 112 and the thinning area 113 both reach 95°, thereby forming a bending portion 920 and a thinning portion 930.

[0079] S630: Select an area at one end of the metal workpiece as the connection area 115 between the metal workpiece and the material strip 100. Remove any scrap material surrounding the metal workpiece, excluding the connection area 115. This forms an upper narrow strip structure 160 above the material strip 100. A metal workpiece is formed below the upper narrow strip structure 160, connected to the upper narrow strip structure 160 via the connection area 115. At this point, a predetermined width of scrap material may be removed from the upper end of the upper narrow strip structure 160 to relieve stress, and a special-shaped structure may be formed at the cutout of the upper narrow strip structure 160 to prevent scrap material from jumping out.

[0080] See also Figure 15 ,by Figure 1 Taking the metal reinforcing sheet 900 in FIG. 1 as an example, a strip-shaped area at the upper end of the metal reinforcing sheet 900 can be selected as the connection area 115 between the metal reinforcing sheet 900 and the material strip 100. The waste material in the third cutout area 151 is first cut out to form the shape of the right side and upper right corner of the main body area 111 in the odd-numbered workpiece forming areas 110 and the shape of the left side and upper left corner of the main body area 111 in the even-numbered workpiece forming areas 110.

[0081] Afterwards, the waste material in the fourth and fifth cutout regions 152 and 153 is removed. By removing the waste material from the fourth switching region, the shapes on the left and upper left sides of the main body region 111 in the odd-numbered workpiece forming regions 110 and on the right and upper right sides of the main body region 111 in the even-numbered workpiece forming regions 110 are formed, allowing the metal reinforcement sheet 900 to be connected to the material strip 100 only via the connection region 115. Simultaneously, the lower narrow strip structure 170 below two adjacent workpiece forming regions 110 is removed. Since the removed lower narrow strip structure 170 is a narrow strip, a dovetail groove 171 is formed at the cutout to prevent waste material from jumping.

[0082] By cutting off the waste material in the fifth switching area, a predetermined width of edge material can be cut off at the upper end of the upper narrow band structure 160 to release stress and reduce the bending degree of the upper narrow band structure 160; and a plurality of dovetail grooves 161 are formed at the incision of the upper narrow band structure 160 as a special-shaped structure to prevent waste material from jumping out.

[0083] S640. Adjust the shape of the material strip 100 (in this embodiment, specifically the upper narrow band structure 160) to reduce or eliminate the curvature of the material strip 100. The method for adjusting the shape of the material strip 100 is: according to the bending direction of the upper narrow band structure 160, vertical strip-shaped depressions are formed at intervals on the upper or lower part of the upper narrow band structure 160 by stamping.

[0084] See also Figure 16 ,by Figure 1Taking the metal reinforcement sheet 900 in FIG. 1 as an example, before eliminating the curvature of the upper narrow band structure 160, the third chamfered area 312 can be chamfered by stamping to remove burrs on the edge of the main body area 111. Subsequently, vertical strip-shaped depressions are formed by stamping according to the curvature of the upper narrow band structure 160. These vertical strip-shaped depressions are generally located along the central axis of the dovetail groove 161 on the upper narrow band structure 160. The density of the vertical strip-shaped depressions can be determined based on the curvature of the upper narrow band structure 160. For example, when the upper narrow band structure 160 bends upward, a first vertical strip-shaped recess 181 can be formed on the upper portion of the upper narrow band structure 160 by punching at the first linear punching position 331, thereby adjusting the upward curvature of the upper narrow band structure 160; when the upper narrow band structure 160 bends downward, a second vertical strip-shaped recess 182 can be formed on the lower portion of the upper narrow band structure 160 by punching at the second linear punching position 332, thereby adjusting the downward curvature of the upper narrow band structure 160. It should be noted that, since the upper narrow band structure 160 generally only bends in one direction, the first vertical strip-shaped recess 181 and the second vertical strip-shaped recess 182 are generally not provided on the upper narrow band structure 160 at the same time. Figure 15 This is just to illustrate the arrangement positions of the first vertical stripe-shaped recess 181 and the second vertical stripe-shaped recess 182 , and does not mean that the first vertical stripe-shaped recess 181 and the second vertical stripe-shaped recess 182 must be arranged at the same time.

[0085] S650: Electroplating the metal workpiece (such as electrogalvanizing) to obtain a finished metal workpiece.

[0086] S660 , cutting the finished metal workpiece from the material strip 100 .

[0087] In this embodiment, the electrophoresis process is replaced by the insulating film 200 process, eliminating the need for baking the paint 800 and requiring no hanger. Furthermore, the insulating film 200 die-cutting process replaces the laser engraving process for removing the paint 800, eliminating the need for fixture positioning, saving process costs and reducing process difficulty. Stamping is performed after etching, without affecting subsequent processes such as electroplating. Furthermore, through the aforementioned process adjustments, the process sequence can be further optimized, with etching thinning performed first and then stamping performed, allowing the production of metal workpieces to be automated and continuous on the strip 100. That is, the production of metal workpieces can be automatically completed through the assembly line operation of the strip 100, eliminating the need for manual processing of individual metal workpieces. This significantly improves production efficiency and reduces production costs.

[0088] The above embodiments merely represent preferred embodiments of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A method for manufacturing a locally thinned metal workpiece, characterized in that: The following steps are involved: S100, dividing the workpiece forming area on the material strip and forming positioning holes; S200, attaching insulating films to the front and back of the material strip respectively; S300, die-cutting and removing the insulating film in a predetermined area on the material strip to form a window area; S400, etching and thinning the window area of ​​the strip; S500, removing the insulating film on the material strip; S600: A finished metal workpiece is produced on the material strip.

2. The method for manufacturing a locally thinned metal workpiece according to claim 1, wherein: In the step S100, the positioning holes include a first positioning hole and a second positioning hole arranged in sequence along the conveying direction of the material belt, the center distance between two adjacent first positioning holes is equal to the center distance between two adjacent workpiece forming areas, and the center distance between two adjacent second positioning holes is equal to the conveying step distance of the material belt.

3. The method for manufacturing a locally thinned metal workpiece according to claim 1, wherein: In the step S200 , the width of the insulating film is greater than the width of the material tape, so that the insulating films on the front and back sides of the material tape are bonded to each other in the thickness direction of the material tape.

4. The method for manufacturing a locally thinned metal workpiece according to claim 1, wherein: In the step S300, the window area includes the area on the material strip that needs to be thinned after the metal workpiece is formed, and does not include the remaining area on the material strip used to form the metal workpiece.

5. The method for manufacturing a locally thinned metal workpiece according to any one of claims 1 to 4, characterized in that: The step S600 includes the following sub-steps: S610, removing waste material around the area requiring stamping and bending in the workpiece forming area, and forming structural features other than the bending of the metal workpiece; S620, forming a bending structural feature of the metal workpiece in a forming area of ​​the workpiece by stamping and bending; S630: Select an area at one end of the metal workpiece as a connection area between the metal workpiece and the material strip, and remove waste material around the metal workpiece except for the connection area; thereby forming an upper narrow strip structure on the upper portion of the material strip, and forming a metal workpiece below the upper narrow strip structure, wherein the metal workpiece is connected to the upper narrow strip structure via the connection area. S640, adjusting the shape of the strip to reduce or eliminate the curvature of the strip; S650, performing electroplating treatment on the metal workpiece to obtain a finished metal workpiece; S660, cutting the finished metal workpiece from the material strip.

6. The method for manufacturing a locally thinned metal workpiece according to claim 5, wherein: The metal workpiece comprises a main body, a bent portion and a thinning portion, wherein the main body and the thinning portion are connected via the bent portion; The workpiece forming area includes a main body area for forming a main body part, a bending area for forming a bending part, a thinning area for forming a thinning part, and a waste area located around the above areas; in the S610 step, the area that needs to be stamped and bent includes the bending area and the thinning area.

7. The method for manufacturing a locally thinned metal workpiece according to claim 6, wherein: The step S610 includes the following sub-steps: S611, sequentially removing waste material from a first cutting area in each workpiece forming area by punching, wherein the first cutting area is used to remove waste material areas on the left and lower left sides of the bending area and the thinning area; S612, sequentially removing waste material from a second cutting area in each workpiece forming area by punching, wherein the second cutting area is used to remove waste material areas on the right side and lower right of the bending area and the thinning area, and the first cutting area and the second cutting area have an overlapping area below the thinning portion; S613, processing the burrs at the punching and cutting positions outside the waste area in the forming area of ​​the workpiece.

8. The method for manufacturing a locally thinned metal workpiece according to claim 6, wherein: The step S620 includes the following sub-steps: S621, bending the bent region and the thinned region by a first punching operation, and making the angle between the bent region and the thinned region approach or reach the angle between the bent portion and the thinned portion; S622, the bending area is further bent by a second punching operation, and the angle between the bending area and the main body area is close to or reaches the angle between the bending portion and the main body; S623. Fine-tune the angle between the bending area and the main area and the angle between the bending area and the thinning area by a third punching to form a bending portion and a thinning portion.

9. The method for manufacturing a locally thinned metal workpiece according to claim 6, wherein: In the step S630, a strip area is selected at the upper end of the metal workpiece as a connection area between the metal workpiece and the material strip; a predetermined width of edge material is cut off at the upper end of the upper narrow strip structure, and a special-shaped structure is formed at the cut of the upper narrow strip structure; In the step S640, the method for adjusting the shape of the material strip is: according to the bending direction of the upper narrow strip structure, vertical strip-shaped depressions are formed at intervals on the upper or lower part of the upper narrow strip structure by punching.

10. The method for manufacturing a locally thinned metal workpiece according to claim 9, wherein: The special-shaped structure is a dovetail groove, and the vertical strip-shaped recess is located on the central axis of the dovetail groove on the upper narrow band structure.

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