A method for manufacturing a metal housing of an electrical connector

Abstract

The application discloses a preparation method of an electric connector metal shell, which is plated with tin through a tin plating device. The tin plating device comprises a front material guiding assembly, a tin brush plating assembly, a rear material guiding assembly, a front guide wheel set, an electro-tinning tank and a rear guide wheel set which are arranged in sequence along a material belt conveying mode. The front and rear material guiding assemblies are matched to make the material belt pass through the tin brush plating assembly in a horizontal state, and the front and rear guide wheel sets are matched to make the material belt pass through the electro-tinning tank in a vertical state. The preparation method comprises the following steps: step a, stamping and forming the metal shell; step b, brushing tin material on the side edge soldering leg position of the metal shell by the tin brush plating assembly; step c, turning over the material belt; step d, carrying out immersion tin plating operation on the tail soldering leg by the electro-tinning tank; step e, carrying out black plating treatment; and step f, cutting the edge material. The application can effectively realize the preparation and processing of the electric connector metal shell, has few processes, high yield and low preparation and processing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of electric connectors, and in particular to a method for preparing a metal shell of an electric connector. Background Art

[0002] like Figure 1 and Figure 2 The illustrated electrical connector metal housing 101 is stamped from a metal strip and has a housing cavity 1011 for accommodating an insulating body. Furthermore, the rear ends of the left and right side walls of the metal housing 101 are each provided with downwardly protruding side weld legs 1012. The rear end of the metal housing 101 is provided with a bent tail portion 1013, and the rear edge of the bent tail portion 1013 is provided with a rearwardly protruding tail weld leg 1014. During assembly of the electrical connector, the insulating body, equipped with electrical terminals, is fitted and secured within the housing cavity 1011 of the metal housing 101. The bent tail portion 1013 of the metal housing 101 is bent downward, so that the tail weld leg 1014 of the bent tail portion 1013 extends downward, similar to the side weld legs 1012.

[0003] Furthermore, during the soldering and mounting process of the electrical connector on the PCB, the side solder legs 1012 and the tail solder legs 1014 of the metal housing 101 are soldered to corresponding solder joints on the PCB. To ensure the soldering quality of the solder legs of the metal housing 101, the side solder legs 1012 and the tail solder legs 1014 of the metal housing 101 are tinned during the manufacturing process of the metal housing 101.

[0004] Among them, the Chinese invention patent application with patent application number: 202010854768.0 and patent name: A method for preparing a hardware plate, which essentially discloses a method for preparing a metal shell of an electrical connector; specifically, the method for preparing the hardware plate includes the following steps:

[0005] Step 1: stamping the sheet material, punching out the shell from the shell strip in mold 1;

[0006] Step 2: electroplating, coating the housing with a shielding film in the area not requiring electroplating, and electroplating the coated housing; after the electroplating is completed, the shielding film on the housing is removed; wherein the shielding film is any one of polyester film, nylon film, aluminized film, high barrier film, biaxially oriented polypropylene film, low-density polyethylene film, and cast polypropylene film;

[0007] Step 3: Riveting: Place the electroplated housing into the second mold, open rivet holes at corresponding positions of the housing, and rivet the first and second spring plates to the housing;

[0008] Step 4: Bending and forming: bend and fold the corresponding areas of the shell to obtain the finished product.

[0009] It should be noted that the above-mentioned method for preparing the metal plate has the following defects, specifically:

[0010] Defect 1. Before electroplating, a shielding film needs to be applied to the area of ​​the housing that does not require electroplating. This requires that a corresponding coating structure must be provided at the corresponding position on the production line so that the shielding film can be applied to the area of ​​the housing that does not require electroplating through the coating structure. In addition, after electroplating, the shielding film on the housing needs to be removed, which requires a shielding film removal process. The above-mentioned shielding film coating and shielding film removal processes significantly increase the processing steps of the housing, thereby affecting the production efficiency of the housing.

[0011] Defect 2: The shielding film coating process needs to be performed before electroplating, and the shielding film removal process needs to be performed after electroplating. The shielding film coating process will affect the electroplating quality of the shell, and thus affect the yield rate of the shell. For example, when the position of the shielding film on the shell surface is not accurate, the electroplating position of the shell will deviate. In addition, the shielding film removal process will also affect the yield rate of the shell. For example, when the shielding film cannot be completely removed, the shielding film will remain on the shell surface, which will affect the electrical performance of the shell. Therefore, the shielding film coating process and the shielding film removal process will also reduce the yield rate of the shell, thereby increasing the shell production and processing costs. Summary of the Invention

[0012] The object of the present invention is to provide a method for preparing a metal shell of an electrical connector in response to the deficiencies in the prior art. The method can effectively realize the preparation and processing of the metal shell of the electrical connector, with fewer steps and a high yield, thereby effectively reducing the preparation and processing cost of the metal shell of the electrical connector.

[0013] To achieve the above objectives, the present invention is implemented through the following technical solutions.

[0014] A method for preparing a metal shell of an electrical connector, wherein the method comprises sequentially tinning the side solder pins and the tail solder pins of the metal shell using a tinning device;

[0015] The tinning device includes a front material guide assembly, a brush tinning assembly, a rear material guide assembly, a front guide wheel assembly, an electroplating tin tank, and a rear guide wheel assembly, which are arranged in sequence from front to rear along the material belt conveying mode. The front material guide assembly cooperates with the rear material guide assembly to allow the material belt to pass through the brush tinning assembly in a horizontal state. The front guide wheel assembly cooperates with the rear guide wheel assembly to allow the material belt to pass through the electroplating tin tank in a vertical state. The material belt is flipped between the rear material guide assembly and the front guide wheel assembly and adjusted from a horizontal state to a vertical state.

[0016] The method for preparing the metal housing of the electrical connector includes the following steps, specifically:

[0017] Step a: feeding the metal strip into a stamping die, wherein the stamping die set stamps out the metal shell, and the stamped metal shell remains connected to the edge material to form a material strip;

[0018] Step b: The material strip carrying the metal shell is conveyed from front to back along the material strip conveying direction, and the material strip passes through the front material guide assembly and the rear material guide assembly. The front material guide assembly cooperates with the rear material guide assembly to make the material strip pass through the brush tinning assembly in a horizontal state. The brush tinning assembly is located above or below the material strip, and the metal shells passing through the brush tinning assembly are arranged horizontally. When the material strip passes through the brush tinning assembly, the brush tinning assembly performs a brush tinning operation and brush-plates tin material on the side soldering feet of the metal shells.

[0019] Step b: The metal shell that has completed the brush tinning operation continues to be transported backward along with the material strip, and enters the front guide wheel assembly after passing through the rear material guide assembly. During this process, the material strip is flipped and adjusted from a horizontal state to a vertical state. The metal shell that enters the front guide wheel assembly position is in a vertical state;

[0020] Step d: The front guide wheel assembly guides the flipped-over vertical strip into the tinning bath. During this process, the front guide wheel assembly cooperates with the rear guide wheel assembly to guide the strip vertically through the tinning bath. As the strip carrying the metal shell passes through the tinning bath, the bent tail of the metal shell on the strip faces downward, and the tail solder pins contact the tinning liquid in the tinning bath, completing the immersion tinning operation of the tail solder pins.

[0021] Step e: The metal shell that has completed the immersion tinning process passes through the rear guide wheel assembly along with the material strip, and then is subjected to a black plating process to form a black protective layer on the surface of the metal shell;

[0022] Step f: feeding the black-plated material strip into a cutting device to cut and separate the metal shell from the edge material.

[0023] Wherein, the front material guiding assembly and the rear material guiding assembly are respectively adjustable material guiding assemblies;

[0024] The adjustable material guide assembly includes a left material guide base and a right material guide base that are opposite to each other and arranged at intervals. The left material guide base is located at the left end side of the right material guide base. An upper pressure wheel shaft and a lower pressure wheel shaft located below the upper pressure wheel shaft are installed between the left material guide base and the right material guide base. The upper pressure wheel shaft is fastened with an upper material guide pressure wheel, and the lower pressure wheel shaft is fastened with a lower material guide pressure wheel, and the upper material guide pressure wheel and the lower material guide pressure wheel are respectively provided with a material belt guide groove;

[0025] During operation, the material strip passes through the gap between the upper material guide pressing wheel and the lower material guide pressing wheel, and the material strip passes through the material strip guide grooves of the upper material guide pressing wheel and the lower material guide pressing wheel respectively.

[0026] The left material guide base and the right material guide base are respectively provided with a first sliding groove and a second sliding groove extending vertically, and a first bearing seat is slidably installed in each first sliding groove corresponding to the upper pressure wheel shaft, and the left end portion and the right end portion of the upper pressure wheel shaft are rotatably installed on the first bearing seat on the corresponding side; the upper ends of the left material guide base and the right material guide base are respectively provided with a first adjusting screw corresponding to the first bearing seat, and each first adjusting screw is connected to the corresponding first bearing seat by a threaded connection;

[0027] A second bearing seat is slidably installed in each second slide groove corresponding to the lower pressure wheel shaft, and the left end portion and the right end portion of the lower pressure wheel shaft are rotatably installed on the second bearing seat on the corresponding side; the upper ends of the left guide base and the right guide base are respectively equipped with second adjusting screws corresponding to the second bearing seats, and each second adjusting screw is connected to the corresponding second bearing seat through a threaded connection.

[0028] The front guide wheel group and the rear guide wheel group each include a guide wheel bracket, and each guide wheel bracket is rotatably mounted with two left and right opposite and spaced apart material belt guide wheels, and each material belt guide wheel is vertically arranged;

[0029] The gap between the two material belt guide wheels of the front guide wheel group is aligned with the feed port of the electroplating tin tank, and the gap between the two material belt guide wheels of the rear guide wheel group is aligned with the discharge port of the electroplating tin tank.

[0030] Among them, the brush tinning component includes conductive tin wool for brush-plating tin on the side soldering pins of the metal shell, and a positioning block located next to the conductive tin wool. The positioning block is provided with a positioning groove for the edge of the feed strip to extend into the strip.

[0031] When the brush tinning component is used to perform brush tinning on the side soldering pins of the metal shell, the current is 1A and the voltage is 3V.

[0032] Wherein, when the tail solder pin position of the metal shell is dip-tinned by the electroplating tin bath, the current is 10A and the voltage is 4V.

[0033] Wherein, the speed at which the material strip passes through the tinning device is 6 meters per minute.

[0034] Compared with the prior art, the present invention has the following beneficial effects. Specifically, the method for preparing the metal shell of the electrical connector of the present invention does not require the sequential execution of the shielding film covering process and the shielding film removal process, and does not require the shielding film covering operation at all. That is, the present invention does not have the problems of the prior art of having many steps, low yield, and high preparation cost due to the need to perform the shielding film covering process and the shielding film removal process. Therefore, the method for preparing the metal shell of the electrical connector of the present invention has the advantages of few steps and high yield, that is, it can effectively realize the preparation and processing of the metal shell of the electrical connector, and can effectively reduce the preparation and processing cost of the metal shell of the electrical connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0036] Figure 1 It is a structural diagram of the metal shell of the electrical connector.

[0037] Figure 2 This is a structural diagram of the metal housing of the electrical connector from another perspective.

[0038] Figure 3 It is a structural schematic diagram of the tinning device of the present invention.

[0039] Figure 4 This is a structural schematic diagram of the tinning device of the present invention from another perspective.

[0040] Figure 5 This is a structural schematic diagram of the tinning device of the present invention from another perspective.

[0041] Figure 6 It is a structural schematic diagram of the front material guiding component or the rear material guiding component of the present invention.

[0042] Figure 7 This is a structural schematic diagram of the front material guiding component or the rear material guiding component of the present invention from another perspective.

[0043] Figure 8 Schematic diagram of the strip where components are located by brush tinning.

[0044] Figure 9 This is a schematic diagram of the material strip passing through the Dingdu milling slot position.

[0045] Figure 10 It is a partial enlarged schematic diagram of the brush tinning component of the present invention.

[0046] exist Figures 1 to 10 These include:

[0047] 11 - front material guiding assembly; 12 - rear material guiding assembly; 131 - left material guiding base; 132 - right material guiding base; 141 - upper pressing wheel shaft; 142 - lower pressing wheel shaft; 151 - upper material guiding pressing wheel; 152 - lower material guiding pressing wheel; 153 - material belt guiding groove; 161 - first sliding groove; 162 - second sliding groove; 171 - first bearing seat; 172 - second bearing seat; 181 - first adjusting screw; 182 - second adjusting screw; 2 - brush plating tin assembly; 21 - conductive tin wool; 22 - positioning block; 221 - material belt positioning groove; 31 - front guide wheel set; 32 - rear guide wheel set; 33 - guide wheel support; 34 - material belt guide wheel; 4 - electroplating tin tank; 100 - material belt; 101 - metal shell; 1011 - shell accommodating cavity; 1012 - side edge soldering leg; 1013 - bent tail portion; 1014 - tail soldering leg; 102 - edge material. DETAILED DESCRIPTION

[0048] The present application will be described in detail below with reference to specific embodiments.

[0049] In one embodiment, as shown in FIG. 1, a method for manufacturing an electrical connector metal shell includes the following steps. Figures 3 to 5 In one embodiment, as shown in FIG. 1, a method for manufacturing an electrical connector metal shell includes the following steps.

[0050] In one embodiment, as shown in FIG. 1, a method for manufacturing an electrical connector metal shell includes the following steps. Figures 3 to 5 In one embodiment, as shown in FIG. 1, a method for manufacturing an electrical connector metal shell includes the following steps.

[0051] In one embodiment, as shown in FIG. 1, a method for manufacturing an electrical connector metal shell includes the following steps.

[0052] Step a, feeding the metal belt into a stamping forming die, the stamping forming die stamping forms the metal shell 101, the stamping formed metal shell 101 remains connected with the edge material 102 and forms the material belt 100 together;

[0053] Step b, feeding the material belt 100 carrying the metal shell 101 from front to rear along the material belt 100 conveying direction, and the material belt 100 passes through the front material guiding assembly 11 and the rear material guiding assembly 12. Figure 8As shown, the front material guide assembly 11 and the rear material guide assembly 12 cooperate to allow the material strip 100 to pass through the brush tinning assembly 2 in a horizontal state. The brush tinning assembly 2 is located above or below the material strip 100, and the metal shells 101 passing through the brush tinning assembly 2 are arranged horizontally. When the material strip 100 passes through the brush tinning assembly 2, the brush tinning assembly 2 performs a brush tinning operation and brush-plates tin material on the side solder legs 1012 of the metal shells 101.

[0054] Step b: The metal shell 101 after the brush tinning operation is continuously transported backward along with the material strip 100, and enters the front guide wheel assembly 31 after passing through the rear guide assembly 12. Figure 9 As shown, the material strip 100 is flipped and adjusted from a horizontal state to a vertical state, and the metal shell 101 that enters the position of the front guide wheel group 31 is in a vertical state;

[0055] Step d: The front guide wheel assembly 31 guides the flipped-over vertical strip 100 into the tinning bath 4. During this process, the front guide wheel assembly 31 cooperates with the rear guide wheel assembly 32 to guide the strip 100 vertically through the tinning bath 4. As the strip 100 carrying the metal shell 101 passes through the tinning bath 4, the bent tail 1013 of the metal shell 101 on the strip 100 faces downward, and the tail solder leg 1014 contacts the tinning liquid in the tinning bath 4, completing the immersion tinning operation on the tail solder leg 1014.

[0056] Step e: The metal housing 101 that has completed the tinning process passes through the rear guide wheel assembly 32 along with the material strip 100, and then undergoes a black plating process to form a black protective layer on the surface of the metal housing 101;

[0057] Step f: feeding the black-plated material strip 100 into a cutting device to cut and separate the metal shell 101 from the edge material 102 .

[0058] It should be pointed out that when the brush tinning operation is performed on the side solder pin 1012 of the metal shell 101 through the brush tinning component 2, the current is 1A and the voltage is 3V; when the immersion tinning operation is performed on the tail solder pin 1014 of the metal shell 101 through the electroplating tin tank 4, the current is 10A and the voltage is 4V; the speed of the material strip 100 passing through the tinning device is 6 meters / minute.

[0059] It should be emphasized that, in the process of tinning the metal shell 101 by the tinning device of the first embodiment, the front guide component 11 and the rear guide component 12 are first used to cooperate with each other to make the material strip 100 pass through the brush tinning component 2 in a horizontal state. At this time, the metal shells 101 on the material strip 100 pass through the brush tinning component 2 in a horizontal state in turn, and the side welding feet 1012 of each metal shell 101 respectively contact the brush tinning component 2, so as to realize the brush tinning component 2 on the metal shell 101 is brush-tinned at the side welding position; after the brush-tinning operation is completed at the side welding foot 1012 position of the metal shell 101, the material strip 100 is flipped over and the material strip 100 passes through the electroplating tin tank 4 in a vertical state. At this time, the bent tails 1013 of each metal shell 101 on the material strip 100 are facing downward and the tail welding foot 1014 of the metal shell 101 contacts the electroplating tin liquid, so as to realize the immersion tinning operation of the tail welding foot 1014 after the metal shell 101 is flipped over.

[0060] Compared with the prior art, the method for preparing the metal shell of the electrical connector of the first embodiment does not need to perform the shielding film covering process and the shielding film removing process successively, and does not need to perform the shielding film covering operation at all. That is, the method for preparing the metal shell of the electrical connector of the first embodiment does not have the problems of many steps, low yield and high preparation cost caused by the need to perform the shielding film covering process and the shielding film removing process in the prior art. Therefore, the method for preparing the metal shell of the electrical connector of the first embodiment has the advantages of few steps and high yield, that is, it can effectively realize the preparation and processing of the metal shell of the electrical connector 101, and can effectively reduce the preparation and processing cost of the metal shell of the electrical connector 101.

[0061] Example 2, as Figure 6 and Figure 7 As shown, the difference between the second embodiment and the first embodiment is that the front material guiding assembly 11 and the rear material guiding assembly 12 are respectively adjustable material guiding assemblies.

[0062] Specifically, the adjustable material guide assembly includes a left material guide base 131 and a right material guide base 132 that are opposite to each other and arranged at intervals. The left material guide base 131 is located at the left end side of the right material guide base 132. An upper pressure wheel shaft 141 and a lower pressure wheel shaft 142 located below the upper pressure wheel shaft 141 are installed between the left material guide base 131 and the right material guide base 132. The upper pressure wheel shaft 141 is fastened with an upper material guide pressure wheel 151, and the lower pressure wheel shaft 142 is fastened with a lower material guide pressure wheel 152, and the upper material guide pressure wheel 151 and the lower material guide pressure wheel 152 are respectively provided with a material strip guiding groove 153.

[0063] It should be pointed out that during operation, the material strip 100 passes through the gap between the upper material guide pressure wheel 151 and the lower material guide pressure wheel 152, and the material strip 100 passes through the material guide groove 153 of the upper material guide pressure wheel 151 and the lower material guide pressure wheel 152 respectively. The material channel guide groove can guide the material strip 100 to be transported and enable the metal shell 101 of the material strip 100 to be aligned with the brush tinning component 2 to ensure that the side weld foot 1012 of the metal shell 101 can accurately and reliably complete the brush tinning operation.

[0064] Example 3, as Figure 6 and Figure 7 As shown, the difference between this embodiment three and embodiment two is that: the left material guide base 131 and the right material guide base 132 are respectively provided with a vertically extending first slide groove 161 and a second slide groove 162, and the first bearing seat 171 is slidably installed in each first slide groove 161 corresponding to the upper pressure wheel shaft 141, and the left end portion and the right end portion of the upper pressure wheel shaft 141 are respectively rotatably installed on the first bearing seat 171 on the corresponding side; the upper ends of the left material guide base 131 and the right material guide base 132 are respectively provided with a first adjusting screw 181 corresponding to the first bearing seat 171, and each first adjusting screw 181 is connected to the corresponding first bearing seat 171 by a threaded connection.

[0065] Among them, a second bearing seat 172 is slidably installed in each second sliding groove 162 corresponding to the lower pressure wheel shaft 142, and the left end and the right end of the lower pressure wheel shaft 142 are rotatably installed on the second bearing seat 172 on the corresponding side; the upper ends of the left material guide base 131 and the right material guide base 132 are respectively equipped with second adjusting screws 182 corresponding to the second bearing seat 172, and each second adjusting screw 182 is connected to the corresponding second bearing seat 172 by a threaded connection.

[0066] For the adjustable material guide assembly of the third embodiment, during its operation, the staff can adaptively adjust the height position of the upper material guide pressure wheel 151 and the lower material guide pressure wheel 152. On the one hand, this allows the material strip 100 to be accurately aligned with the brush tinning operation position, and on the other hand, it can adapt to the different thicknesses of the metal shell of the electrical connector. When adjusting, the staff only needs to turn the first adjustment screw 181 or the second adjustment screw 182. When the first adjustment screw 181 is turned, the first adjustment screw 181 drives the first bearing seat 171 to move up and down along the first slide groove 161, and the first bearing seat 171 drives the upper pressure wheel shaft 141 and the upper material guide pressure wheel 151 to move up and down synchronously. When the second adjustment screw 182 is turned, the second adjustment screw 182 drives the second bearing seat 172 to move up and down along the second slide groove 162, and the second bearing seat 172 drives the lower pressure wheel shaft 142 and the lower material guide pressure wheel 152 to move up and down synchronously.

[0067] Example 4, as Figures 3 to 5As shown, the difference between this fourth embodiment and the first embodiment is that the front guide wheel group 31 and the rear guide wheel group 32 respectively include a guide wheel bracket 33, and each guide wheel bracket 33 is rotatably installed with two material belt guide wheels 34 that are opposite to each other and arranged at intervals on the left and right, and each material belt guide wheel 34 is arranged vertically.

[0068] Among them, the gap between the two material strip guide wheels 34 of the front guide wheel group 31 is aligned with the feed port of the electroplating tin tank 4, so that the material strip 100 passing through the front guide wheel group 31 can accurately enter the feed port of the electroplating tin tank 4; the gap between the two material strip guide wheels 34 of the rear guide wheel group 32 is aligned with the discharge port of the electroplating tin tank 4.

[0069] Example 5, as Figure 3 、 Figure 4 、 Figure 5 as well as Figure 10 As shown, the difference between this embodiment five and embodiment one is that the brush tinning component 2 includes a conductive tin wool 21 for brush-plating tin on the side soldering foot 1012 of the metal shell 101, and a positioning block 22 located next to the conductive tin wool 21. The positioning block 22 is provided with an edge of the edge material 102 of the supply belt 100 extending into the belt positioning groove 221.

[0070] It should be explained that when the material strip 100 carries the metal shell 101 through the brush tinning component 2, the side solder leg 1012 of the metal shell 101 contacts the conductive tin wool 21. When powered on, the conductive tin wool 21 coats the tin material on the side solder leg 1012 of the metal shell 101 by brush tinning. During this process, the edge material 102 of the material strip 100 falls into the material strip positioning groove 221 of the positioning block 22 and moves along the material strip positioning groove 221 to ensure the accuracy of the left and right position of the material strip 100 during the brush tinning operation, thereby improving the stability and reliability of the brush tinning operation.

[0071] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A method for preparing a metal housing of an electrical connector, characterized in that: The method for preparing the metal shell of the electric connector sequentially tins the side solder pins (1012) and the tail solder pins (1014) of the metal shell (101) using a tinning device; The tinning device comprises a front guide assembly (11), a brush tinning assembly (2), a rear guide assembly (12), a front guide wheel assembly (31), an electroplating tin tank (4), and a rear guide wheel assembly (32) which are sequentially arranged from front to back along the conveying mode of the material strip (100); the front guide assembly (11) cooperates with the rear guide assembly (12) and enables the material strip (100) to pass through the brush tinning assembly (2) in a horizontal state; the front guide wheel assembly (31) cooperates with the rear guide wheel assembly (32) and enables the material strip (100) to pass through the electroplating tin tank (4) in a vertical state; the material strip (100) is turned over between the rear guide assembly (12) and the front guide wheel assembly (31) and adjusted from a horizontal state to a vertical state; The method for preparing the metal housing of the electrical connector includes the following steps, specifically: Step a, feeding the metal strip into a stamping die, and the stamping die set stamping the metal shell (101), wherein the stamped metal shell (101) remains connected to the edge material (102) and together forms the material strip (100); Step b, the material strip (100) carrying the metal shell (101) is conveyed from front to back along the conveying direction of the material strip (100), and the material strip (100) passes through the front material guide component (11) and the rear material guide component (12), the front material guide component (11) and the rear material guide component (12) cooperate to make the material strip (100) pass through the brush tinning component (2) in a horizontal state, the brush tinning component (2) is located above or below the material strip (100), and the metal shells (101) passing through the brush tinning component (2) are arranged horizontally, and in the process of the material strip (100) passing through the brush tinning component (2), the brush tinning component (2) performs a brush tinning operation and brush-plates tin material on the side welding foot (1012) position of the metal shell (101); Step b, the metal shell (101) that has completed the brush tinning operation continues to be transported backward along with the material strip (100), and enters the front guide wheel assembly (31) after passing through the rear material guide assembly (12). During this process, the material strip (100) is turned over and adjusted from a horizontal state to a vertical state, and the metal shell (101) that enters the position of the front guide wheel assembly (31) is in a vertical state; Step d, the front guide wheel group (31) guides the material strip (100) turned to a vertical state into the electroplating tin bath (4). During this process, the front guide wheel group (31) cooperates with the rear guide wheel group (32) to make the material strip (100) pass through the electroplating tin bath (4) in a vertical state; when the material strip (100) carries the metal shell (101) through the electroplating tin bath (4), the bent tail (1013) of the metal shell (101) on the material strip (100) faces downward and the tail solder leg (1014) contacts the electroplating tin liquid in the electroplating tin bath (4), thereby completing the immersion tinning operation of the tail solder leg (1014); Step e: the metal shell (101) that has completed the tinning process passes through the rear guide wheel assembly (32) along with the material strip (100), and then is subjected to a black plating process to form a black protective layer on the surface of the metal shell (101); Step f: feeding the black-plated material strip (100) into a cutting device to cut and separate the metal shell (101) from the edge material (102).

2. The method for preparing a metal housing of an electrical connector according to claim 1, wherein: The front material guiding assembly (11) and the rear material guiding assembly (12) are respectively adjustable material guiding assemblies; The adjustable material guide assembly includes a left material guide base (131) and a right material guide base (132) which are arranged opposite to each other and spaced apart. The left material guide base (131) is located at the left end side of the right material guide base (132). An upper pressing wheel shaft (141) and a lower pressing wheel shaft (142) located below the upper pressing wheel shaft (141) are installed between the left material guide base (131) and the right material guide base (132). The upper pressing wheel shaft (141) is fitted with an upper material guide pressing wheel (151), and the lower pressing wheel shaft (142) is fitted with a lower material guide pressing wheel (152). The upper material guide pressing wheel (151) and the lower material guide pressing wheel (152) are respectively provided with a material belt guide groove (153). During operation, the material belt (100) passes through the gap between the upper material guide pressing wheel (151) and the lower material guide pressing wheel (152), and the material belt (100) passes through the material belt guide grooves (153) of the upper material guide pressing wheel (151) and the lower material guide pressing wheel (152), respectively.

3. The method for preparing a metal housing of an electrical connector according to claim 2, wherein: The left material guide base (131) and the right material guide base (132) are respectively provided with a first sliding groove (161) and a second sliding groove (162) extending vertically, and a first bearing seat (171) is slidably installed in each first sliding groove (161) corresponding to the upper pressure wheel shaft (141), and the left end and the right end of the upper pressure wheel shaft (141) are respectively rotatably installed on the first bearing seat (171) on the corresponding side; the upper end of the left material guide base (131) and the right material guide base (132) are respectively provided with a first adjusting screw (181) corresponding to the first bearing seat (171), and each first adjusting screw (181) is connected to the corresponding first bearing seat (171) by a threaded connection; A second bearing seat (172) is slidably mounted in each second slide groove (162) corresponding to the lower pressure wheel shaft (142), and the left end portion and the right end portion of the lower pressure wheel shaft (142) are rotatably mounted on the second bearing seat (172) on the corresponding side; the upper ends of the left material guide base (131) and the right material guide base (132) are respectively equipped with a second adjusting screw (182) corresponding to the second bearing seat (172), and each second adjusting screw (182) is connected to the corresponding second bearing seat (172) by a threaded connection.

4. The method for preparing a metal housing of an electrical connector according to claim 1, wherein: The front guide wheel group (31) and the rear guide wheel group (32) each include a guide wheel bracket (33), and each guide wheel bracket (33) is rotatably mounted with two left and right facing and spaced apart material belt guide wheels (34), and each material belt guide wheel (34) is vertically arranged. The gap between the two material strip guide wheels (34) of the front guide wheel group (31) is aligned with the feed port of the electroplating tin tank (4), and the gap between the two material strip guide wheels (34) of the rear guide wheel group (32) is aligned with the discharge port of the electroplating tin tank (4).

5. The method for preparing a metal housing of an electrical connector according to claim 1, wherein: The brush tinning assembly (2) includes a conductive tin cotton (21) for brush-plating tin material on the side soldering feet (1012) of the metal shell (101), and a positioning block (22) located next to the conductive tin cotton (21). The positioning block (22) is provided with an edge of the edge material (102) of the supply belt (100) extending into the belt positioning groove (221).

6. The method for preparing a metal housing of an electrical connector according to claim 1, wherein: When the brush tinning component (2) is used to perform a brush tinning operation on the side welding pins (1012) of the metal housing (101), the current is 1A and the voltage is 3V.

7. The method for preparing a metal housing of an electrical connector according to claim 1, wherein: When the tail solder pin (1014) of the metal shell (101) is subjected to tinning by the electroplating tin bath (4), the current is 10A and the voltage is 4V.

8. The method for preparing a metal housing of an electrical connector according to claim 1, wherein: The speed at which the material strip (100) passes through the tinning device is 6 meters per minute.

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