Method of making a locally thinned metal workpiece

Abstract

The application discloses a kind of local thinning metal workpiece manufacturing method, comprising: dividing workpiece forming area on material belt, and forming positioning hole;The front and back of material belt are pasted respectively with insulating film;Die cutting is removed in predetermined area of insulating film on material belt, and windowed area is formed;Material belt is etched and thinned to windowed area;Remove insulating film on material belt;Metal workpiece finished product is obtained on material belt and is manufactured.The application, by adjusting process and optimizing process sequence, the production process of metal workpiece can be automatically and continuously carried out, without manual processing of single metal workpiece, greatly improve production efficiency, reduce production cost.

Description

Technical Field

[0001] This invention belongs to the field of metal workpiece manufacturing, and in particular relates to a method for manufacturing metal workpieces with localized thinning. Background Technology

[0002] Metal workpieces are generally manufactured by sequential stamping on an assembly line using strip material. Some small metal workpieces are used to reinforce components in products such as mobile phones. To meet the reinforcement requirements of these components, harder and thicker stainless steel materials (such as SUS316L 3 / 4H, T0.2) are used. Furthermore, due to the structural space requirements of products like mobile phones, it is often necessary to locally thin the metal workpieces (overall thinning would affect the strength of the workpiece). Because the metal workpiece material is relatively hard, it is difficult to achieve localized thinning through stamping and extrusion. Therefore, a process is often used: first, the metal workpiece is formed; then, it is protected by baking paint; next, the area to be thinned is laser-etched and etched to reduce the thickness; finally, the paint is removed. However, this thinning process is complex and requires processing discrete individual metal workpieces, resulting in cumbersome steps and low efficiency. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a method for manufacturing metal workpieces with localized thinning.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] A method for manufacturing a metal workpiece with localized thinning includes the following steps:

[0006] S100. Divide the workpiece forming area on the strip and form positioning holes;

[0007] S200, Apply insulating film to both the front and back of the material strip;

[0008] S300: Die-cut and remove the insulating film from a predetermined area on the strip to form a windowed area;

[0009] S400, etching to thin the windowed area of ​​the strip;

[0010] S500, Remove the insulating film from the material strip;

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

[0012] Furthermore, in step S100, the positioning holes include a first positioning hole and a second positioning hole arranged sequentially along the conveying direction of the material strip. 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 strip.

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

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

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

[0016] S610: Remove the waste material around the area that needs to be stamped and bent in the forming area of ​​the workpiece, and form structural features other than bending of the metal workpiece.

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

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

[0019] S640. Adjust the shape of the material strip to reduce or eliminate the curvature of the material strip;

[0020] S650. Electroplating is performed on the metal workpiece to obtain the finished metal workpiece.

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

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

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

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

[0025] S611. In each workpiece forming area, the waste material in the first cutting area is removed by stamping. The first cutting area is used to remove the waste material area on the left and lower left of the bending area and the thinning area.

[0026] S612. In each workpiece forming area, the waste material of the second cutting area is removed by stamping. The second cutting area is used to remove the waste material area on the right and lower right of the bending area and the thinning area. The first cutting area and the second cutting area have an overlapping area below the thinning part.

[0027] S613. Burrs at the stamping cut-off location outside the scrap area in the workpiece forming area are processed.

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

[0029] S621. The bending area and the thinning area are both bent by the first stamping, and the included angle between the bending area and the thinning area is close to or reaches the included angle between the bending part and the thinning part.

[0030] S622. The bending area continues to bend through a second stamping, and the angle between the bending area and the main body area approaches or reaches the angle between the bending part and the main body.

[0031] S623. The angle between the bending area and the main body area, as well as the angle between the bending area and the thinning area, are finely adjusted by the third stamping to form the bending part and the thinning part.

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

[0033] In step S640, the method for adjusting the shape of the strip is as follows: according to the bending direction of the upper narrow strip structure, vertically spaced recesses are formed at intervals on the upper or lower part of the upper narrow strip structure by stamping.

[0034] Furthermore, the irregular 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 this invention, an insulating film coating process replaces the electrophoresis process, eliminating the need for paint baking and fixtures. Furthermore, an insulating film die-cutting process replaces the laser engraving process for removing paint, eliminating the need for fixture positioning. This saves on process costs and reduces process complexity. In addition, through these process adjustments, the process sequence can be further optimized by employing etching for thinning followed by stamping. This allows the entire metal workpiece production process to be automated and continuous on the strip, meaning that metal workpiece production can be automatically completed through a strip assembly line operation, eliminating the need for manual processing of individual metal workpieces. This significantly improves production efficiency and reduces production costs. Attached Figure Description

[0036] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

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

[0038] Figure 2 This is a schematic diagram showing the metal reinforcement sheet after it has been covered with paint for masking.

[0039] Figure 3 This is a schematic diagram showing the paint removal process for a specific area of ​​a metal reinforcing sheet after laser engraving.

[0040] Figure 4 The left view shows the metal reinforcing sheet after it has been etched and thinned in an etching solution.

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

[0042] Figure 6 This is a schematic diagram showing the division of workpiece forming areas on the strip.

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

[0044] Figure 8 This is a schematic diagram after the insulating film on the material strip has been removed.

[0045] Figure 9 This is a schematic diagram showing the waste material after being removed from the first cut-off area.

[0046] Figure 10 This is a schematic diagram showing the waste material after being removed from the second cutting area.

[0047] Figure 11 This is a schematic diagram of the first and second chamfered regions.

[0048] Figure 12 This is a schematic diagram of three-stage stamping and bending.

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

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

[0051] Figure 15 This is a schematic diagram of the third, fourth, and fifth resection regions.

[0052] Figure 16 This is a schematic diagram of the third chamfer area and the linear stamping position.

[0053] The diagrams in the instruction manual are labeled 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 cutting area - 121, 122; Second cutting area - 131, 132; Overlapping area - 140; Third cutting area - 151; Fourth cutting area - 152; Fifth cutting area - 153; Upper narrow strip structure - 160; Lower narrow strip structure - 170; Dovetail groove - 161, 171; First vertical strip-shaped recess - 181; Second vertical strip-shaped recess - 182;

[0055] Insulating film 200; Window opening area - 201; First chamfer area - 311; Second chamfer area - 312; Third chamfer area - 312; First stamping bending area - 321; Second stamping bending area - 322; Third stamping bending area - 323; First linear stamping position - 331; Second linear stamping position - 332;

[0056] Paint - 800; Metal reinforcing plate - 900; Main body - 910; Through hole - 911; Pointing arrow - 912; Bending part - 920; Thinning part - 930; Arc-shaped notch - 931; Convex bulge - 932. Detailed Implementation

[0057] The following specific examples illustrate the implementation of the present invention. The illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0058] Please see Figure 1This is a schematic diagram of a partially thinned metal workpiece. The metal workpiece is a metal reinforcing sheet 900 for an internal component of a mobile phone, including a main body 910, a bending portion 920, and a thinned portion 930. The main body 910 and the thinned portion 930 are connected by the bending portion 920. The main body 910 has a through hole 911, and a directional arrow 912 is provided on the front side of the main body 910. The first side of the thinned portion 930 has a concave arc-shaped notch 931, and two protrusions 932 are provided on one side of the thinned portion 930 with the arc-shaped notch 931. The thickness of the main body 910 and the bending portion 920 is 0.2 mm, and the thickness of the thinned portion 930 is less than the thickness of the main body 910 and the bending portion 920, which is 0.15 mm. The metal reinforcing sheet 900 is made of stainless steel (SUS316L 3 / 4H, T0.2). Because the material is hard, it is impossible to thin the local area from 0.2mm to 0.15mm by stamping and extrusion. Therefore, an etching thinning process is used to reduce the thickness of the thinned part 930 by 0.05mm.

[0059] Existing processing technology is limited by conditions such as electrophoresis, making it impossible to use strip 100 for assembly line processing. It can only operate on individual metal workpieces, and the processing procedure is as follows: first, it obtains the desired shape through stamping. Figure 1 A single metal reinforcing sheet, 900. Then, please refer to... Figure 2 The metal reinforcing sheet 900 is immersed in paint 800, and a layer of paint 800 is applied to the surface of the metal reinforcing sheet 900 through full-circumference electrophoresis and baking for masking. Afterwards, please refer to... Figure 3 For the metal reinforcing sheet 900, the localized areas requiring etching and thinning are treated with laser engraving to remove the paint 800. Afterwards, please refer to... Figure 4 The metal reinforcing sheet 900 is immersed in an etching solution for etching, thinning the area where the paint 800 was removed by laser engraving to a thickness of 0.15mm. Finally, the metal reinforcing sheet 900 is removed, the paint 800 on its surface is removed, and electroplating is performed.

[0060] In the aforementioned processes, electrophoresis requires a mounting fixture, and laser engraving requires a positioning jig, making the processes complex. Furthermore, these processes are limited by the conditions of full-circumference electrophoresis, and can only be operated on a single metal reinforcing sheet 900 product, resulting in cumbersome operation, low efficiency, and high cost.

[0061] Please see Figure 5 , Figure 5 This is a flowchart illustrating an embodiment of the method for fabricating a partially thinned metal workpiece according to the present invention. The method for fabricating a partially thinned metal workpiece in this embodiment includes the following steps:

[0062] S100, please refer to Figure 6The strip 100 is divided into workpiece forming areas 110 according to the size of the metal workpiece, and positioning holes are drilled 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 sequentially arranged along the conveying direction of the strip 100. For example, the first positioning hole 101 may be sequentially arranged in the upper part of the strip 100 along the conveying direction, and the second positioning hole 102 may be sequentially arranged in the lower part of the strip 100 along the conveying direction. It should be noted that in this embodiment, "upper part" and "lower part" refer to... Figure 6 The location is described in the text, not in the location of the material strip 100 during processing.

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

[0064] by Figure 1 Taking the metal reinforcing sheet 900 as an example, since its width is relatively small, less than half the conveying step distance of the strip 100, half the conveying step distance of the strip 100 can be used as the width of the workpiece forming area 110, dividing the strip 100 into several workpiece forming areas 110. Figure 6 The dotted line in the diagram represents the boundary line dividing the workpiece forming area 110. Of course, the workpiece forming area 110 is only theoretically divided for positioning during processing; it is not necessary to actually draw a boundary line on the 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 surrounding the aforementioned areas.

[0065] S200, please refer to Figure 7 Insulating films 200 are applied to both the front and back sides of the material strip 100 to protect it during subsequent etching. The width of the insulating films 200 is generally slightly larger than the width of the material strip 100, so that the insulating films 200 on the front and back sides of the material strip 100 adhere to each other in the thickness direction of the material strip 100, providing full circumference protection for the material strip 100.

[0066] S300, please continue reading Figure 7An insulating film 200 of a predetermined area is removed from the strip 100 by die-cutting, forming a windowed area 201. The windowed area 201 includes the area on the strip 100 that needs to be thinned after the metal workpiece is formed, but does not include the remaining area on the strip 100 used to form the metal workpiece. That is, the windowed area 201 is determined by the location where the product needs to be thinned; it can be on the front or back of the strip 100, and if necessary, it can be formed on both the front and back of the strip 100 simultaneously. Figure 1 Taking the metal reinforcing sheet 900 as an example, the insulating film 200 needs to be removed above the thinning area 113 on the strip 100 used to form the thinning part 930, and its surface is exposed through the window area 201. The main body area 111 and the bending area 112 on the strip 100 used to form the main body part 910 and the bending part 920 need to be covered under the insulating film 200 for protection. The waste area 114 is not required and can be determined according to the specific situation.

[0067] S400: The windowed area 201 of the strip 100 is etched to thin it. The strip 100 is passed sequentially through an etching tank containing an etching solution. Since the windowed area 201 on the front side of the strip 100 is exposed, a portion is etched away, thus thinning it. The remaining portion of the strip 100 is protected by an insulating film 200 and is therefore not etched. Figure 1 Taking the metal reinforcing sheet 900 as an example, by controlling the etching process, the thickness of the strip 100 in the windowed area can be etched from 0.2mm to 0.15mm. The specific etching process is existing technology and will not be described in detail here.

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

[0069] S600, A finished metal workpiece is produced on the strip 100. This step may include the following sub-steps:

[0070] S610, Remove the waste material around the area requiring stamping and bending in the workpiece forming area 110 to facilitate subsequent stamping and forming of structural features other than bending of the metal workpiece (excluding edge shape features of the metal workpiece). Figure 1 Taking the metal reinforcing sheet 900 as an example, this step requires removing the waste material around the bent area 112 and the thinned area 113, and forming a through hole 911, a pointing arrow 912, an arc-shaped notch 931, and a convex bulge 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 cutting area (121, 122) is sequentially removed by stamping. The first cutting area (121, 122) is used to remove the waste material area 114 on the left and lower left 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, two stamping stations are required to remove the waste material in the first cutting area (121, 122). One station is used to remove the waste material in the first cutting area 121 of the workpiece forming area 110 with odd numbered sequence, and the other station is used to remove the waste material in the first cutting area 122 of the workpiece forming area 110 with even numbered sequence. Since the first cutting area (121, 122) is located below the strip 100, during the interval of the above cutting process, two stamping stations can be used to form pointing arrows 912 in the odd-numbered workpiece forming area 110 and the even-numbered workpiece forming area 110 respectively above the strip 100.

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

[0073] S613, please refer to Figure 11The burrs at the stamping cut-off location outside the scrap area 114 in the workpiece forming area 110 are processed. First, a chamfer can be formed in the first chamfer area 311 below the corresponding strip 100 by stamping to remove burrs from the edges of the bending area 112 and the thinning area 113. Then, a chamfer can be formed in the second chamfer area 312 above the corresponding strip 100 by stamping to remove burrs around the through hole 911. Afterwards, two protrusions 932 can be formed in the thinning area 113 by stamping.

[0074] S620, The bending structure feature of the metal workpiece is formed in the workpiece forming area 110 by stamping and bending.

[0075] Still with Figure 1 Taking the metal reinforcing sheet 900 in the example, this step may include the following sub-steps:

[0076] S621, please refer to Figure 12 The first stamping process causes both the bending region 112 and the thinning region 113 to bend, and the included angle between the bending region 112 and the thinning region 113 approaches or reaches the included angle between the bending portion 920 and the thinning portion 930; the included angle between the bending region 112 and the main body region 111 can be greater than the included angle between the bending portion 920 and the main body portion 910. Please refer to... Figure 13 For example, this step can make the angle between the bending region 112 and the main body region 111 approach or reach 125°, and the angle between the bending region 112 and the thinning region 113 approach or reach 95°.

[0077] S622, please continue reading Figure 12 The bending region 112 continues to bend through a second stamping, 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. (See also...) Figure 14 For example, this step can make the included angle between the bending area 112 and the main body area 111 approach or reach 95°.

[0078] S623, please continue reading Figure 12 The angle between the bending area 112 and the main body area 111, as well as the angle between the bending area 112 and the thinning area 113, are finely adjusted by the third stamping, so that the angle between the bending area 112 and the main body area 111, as well as the angle between the bending area 112 and the thinning area 113, both reach 95°, thereby forming the bending part 920 and the thinning part 930.

[0079] S630. Select a region at one end of the metal workpiece as the connection region 115 between the metal workpiece and the strip 100, and remove the waste material around the metal workpiece except for the connection region 115. This forms an upper narrow strip structure 160 on the upper part of the strip 100, and a metal workpiece is formed below the upper narrow strip structure 160. The metal workpiece is connected to the upper narrow strip structure 160 through the connection region 115. At this time, a predetermined width of edge material can also be removed from the upper end of the upper narrow strip structure 160 to release stress, and an irregular structure can be formed at the cut of the upper narrow strip structure 160 to prevent waste material from jumping out.

[0080] Please see Figure 15 ,by Figure 1 Taking the metal reinforcing sheet 900 as an example, a strip-shaped area can be selected at the upper end of the metal reinforcing sheet 900 as the connection area 115 between the metal reinforcing sheet 900 and the strip 100. First, the waste material in the third cutting area 151 is cut off to form the shape on the right and upper right of the main body area 111 in the odd-numbered workpiece forming area 110 and the shape on the left and upper left of the main body area 111 in the even-numbered workpiece forming area 110.

[0081] Subsequently, the waste in the fourth cutting area 152 and the fifth cutting area 153 are removed respectively. By removing the waste in the fourth switching area, the shapes of the left and upper left sides of the main body area 111 in the odd-numbered workpiece forming areas 110 and the shapes of the right and upper right sides of the main body area 111 in the even-numbered workpiece forming areas 110 can be formed, so that the metal reinforcing sheet 900 is connected to the strip 100 only through the connecting area 115. At the same time, the lower narrow strip structure 170 below the two adjacent workpiece forming areas 110 is also removed. Since the removed lower narrow strip structure 170 is a narrow strip, in order to avoid the occurrence of scrap jumping, a dovetail groove 171 can be formed at the cut as an irregular structure.

[0082] By removing the waste material in the fifth switching area, a predetermined width of edge material can be removed from the upper end of the upper narrow strip structure 160 to release stress and reduce the bending degree of the upper narrow strip structure 160; and multiple dovetail grooves 161 are formed at the cut of the upper narrow strip structure 160 as irregular structures to prevent the waste material from jumping out.

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

[0084] Please see Figure 16 ,by Figure 1Taking the metal reinforcing sheet 900 as an example, before eliminating the curvature of the upper narrow strip structure 160, the third chamfer area 312 can be chamfered by stamping to remove the burrs on the edge of the main body area 111. Then, vertical grooves are formed by stamping according to the bending direction of the upper narrow strip structure 160; the vertical grooves are generally set on the central axis of the dovetail groove 161 on the upper narrow strip structure 160, and the density of the vertical grooves can be determined according to the curvature of the upper narrow strip structure 160. For example, when the upper narrow strip structure 160 bends upward, a first vertical strip-shaped recess 181 can be formed on the upper part of the upper narrow strip structure 160 by stamping at the first linear stamping position 331, thereby adjusting the curvature of the upward bend of the upper narrow strip structure 160; when the upper narrow strip structure 160 bends downward, a second vertical strip-shaped recess 182 can be formed on the lower part of the upper narrow strip structure 160 by stamping at the second linear stamping position 332, thereby adjusting the curvature of the downward bend of the upper narrow strip structure 160. It should be noted that since the upper narrow strip 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 simultaneously provided on the upper narrow strip structure 160. Figure 15 This is only to illustrate the location of the first vertical groove 181 and the second vertical groove 182, and does not mean that the first vertical groove 181 and the second vertical groove 182 should be set at the same time.

[0085] S650. Electroplating (such as zinc plating) is performed on metal workpieces to obtain finished metal workpieces.

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

[0087] In this embodiment, the process of covering with an insulating film 200 replaces the electrophoresis process, eliminating the need for baking paint 800 and fixtures. Furthermore, the process of die-cutting the insulating film 200 replaces the laser engraving process for removing paint 800, eliminating the need for fixture positioning, thus saving process costs and reducing process difficulty. Etching followed by stamping does not affect subsequent processes such as continuous electroplating. In addition, through the above process adjustments, the process sequence can be further optimized by etching to thin the metal before stamping, allowing the entire production process 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, greatly improving production efficiency and reducing production costs.

[0088] The above embodiments merely illustrate preferred implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. A method for manufacturing a metal workpiece with localized thinning, characterized in that, Includes the following steps: S100. Divide the workpiece forming area on the strip and form positioning holes; S200, Apply insulating film to both the front and back of the material strip; S300: Die-cut and remove the insulating film from a predetermined area on the strip to form a windowed area; S400, etching to thin the windowed area of ​​the strip; S500, Remove the insulating film from the material strip; S600, to produce finished metal workpieces on a strip; The S600 step includes the following sub-steps: S610. Remove the waste material around the area that needs to be stamped and bent in the forming area of ​​the workpiece, and form structural features other than bending of the metal workpiece; the area that needs to be stamped and bent includes the bending area and the thinning area; S620, The bending structure feature of a metal workpiece is formed in the forming area of ​​the workpiece by stamping and bending; S630. Select an area at one end of the metal workpiece as the connection area between the metal workpiece and the strip, and cut off the waste material around the metal workpiece except for the connection area; thereby forming an upper narrow strip structure on the upper part of the strip, and forming a metal workpiece below the upper narrow strip structure, wherein the metal workpiece is connected to the upper narrow strip structure through the connection area. S640. Adjust the shape of the material strip to reduce or eliminate the curvature of the material strip; S650. Electroplating is performed on the metal workpiece to obtain the finished metal workpiece. S660, Cut the finished metal workpiece from the strip; In step S630, a strip-shaped area is selected at the upper end of the metal workpiece as the connection area between the metal workpiece and the strip; a predetermined width of edge material is cut off at the upper end of the upper narrow strip structure, and an irregular structure is formed at the cut of the upper narrow strip structure. In step S640, the method for adjusting the shape of the strip is as follows: according to the bending direction of the upper narrow strip structure, vertically spaced recesses are formed at intervals on the upper or lower part of the upper narrow strip structure by stamping. The metal workpiece includes a main body, a bent portion, and a thinned portion, wherein the main body and the thinned portion are connected by the bent portion. The workpiece forming area includes a main body area for forming the main body, a bending area for forming the bending part, a thinning area for forming the thinning part, and a scrap area surrounding the above areas; in step S610, the area that needs to be stamped and bent includes the bending area and the thinning area.

2. The method for manufacturing a partially thinned metal workpiece as described in claim 1, characterized in that: In step S100, the positioning holes include a first positioning hole and a second positioning hole arranged sequentially along the conveying direction of the material strip. 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 strip.

3. The method for manufacturing a partially thinned metal workpiece as described in claim 1, characterized in that: In step S200, the width of the insulating film is greater than the width of the strip, so that the insulating films on the front and back of the strip are bonded to each other in the thickness direction of the strip.

4. The method for manufacturing a partially thinned metal workpiece as described in claim 1, characterized in that: In step S300, the windowed area includes the area on the strip that needs to be thinned after the metal workpiece is formed, but does not include the remaining area on the strip used to form the metal workpiece.

5. The method for manufacturing a partially thinned metal workpiece as described in any one of claims 1 to 4, characterized in that, Step S610 includes the following sub-steps: S611. In each workpiece forming area, the waste material in the first cutting area is removed by stamping. The first cutting area is used to remove the waste material area on the left and lower left of the bending area and the thinning area. S612. In each workpiece forming area, the waste material of the second cutting area is removed by stamping. The second cutting area is used to remove the waste material area on the right and lower right of the bending area and the thinning area. The first cutting area and the second cutting area have an overlapping area below the thinning part. S613. Burrs at the stamping cut-off location outside the scrap area in the workpiece forming area are processed.

6. The method for manufacturing a partially thinned metal workpiece as described in any one of claims 1 to 4, characterized in that, Step S620 includes the following sub-steps: S621. The bending area and the thinning area are both bent by the first stamping, and the included angle between the bending area and the thinning area is close to or reaches the included angle between the bending part and the thinning part. S622. The bending area continues to bend through a second stamping, and the angle between the bending area and the main body area approaches or reaches the angle between the bending part and the main body. S623. The angle between the bending area and the main body area, as well as the angle between the bending area and the thinning area, are finely adjusted by the third stamping to form the bending part and the thinning part.

7. The method for manufacturing a partially thinned metal workpiece as described in any one of claims 1 to 4, characterized in that: The irregular 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.

Images