Preparation method of metal shell of electric connector

Abstract

The invention discloses a method for preparing a metal shell of an electric connector, which comprises the following steps of: tinning through a tinning device, and the tinning device comprises a front material guide assembly, a tinning brushing assembly, a rear material guide assembly, a front guide wheel group, an electrotinning bath and a rear guide wheel group which are sequentially arranged at intervals from front to back along a material belt conveying mode, the front guide assembly and the rear guide assembly are matched to enable a material belt to pass through the tin brushing assembly in a horizontal state, and the front guide wheel set and the rear guide wheel set are matched to enable the material belt to pass through the tin electroplating bath in a vertical state. The preparation method comprises the following steps: step a, punch forming of the metal shell; b, a tin brushing and plating assembly brushes and coats tin on the side edge welding leg position of the metal shell; step b, turning over the material belt; step d, carrying out dip tinning operation on the tail welding leg by the electrotinning bath; step e, black plating treatment; and f, edge materials are cut. According to the invention, the preparation and processing of the metal shell of the electric connector can be effectively realized, the procedures are few, the yield is high, and the preparation and processing cost can be reduced.

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 metal shell 101 of the electrical connector shown is formed by stamping a metal strip, and has a shell accommodating cavity 1011 for accommodating an insulating body; in addition, the rear ends of the left and right walls of the metal shell 101 are respectively provided with side welding legs 1012 protruding downward, and the rear end of the metal shell 101 is provided with a bent tail 1013, and the rear edge of the bent tail 1013 is provided with a rear welding leg 1014 protruding backward. During the assembly process of the electrical connector, the insulating body equipped with the electrical terminals is embedded and fastened in the shell accommodating cavity 1011 of the metal shell 101, and the bent tail 1013 of the metal shell 101 is bent downward, so that the tail welding leg 1014 of the bent tail 1013 extends downward like the side welding leg 1012.

[0003] In addition, in the process of welding and installing the electrical connector on the PCB board, the side welding pins 1012 and the tail welding pins 1014 of the metal shell 101 are respectively welded to the corresponding welding point positions of the PCB board. In order to ensure the welding quality of each welding pin of the metal shell 101, the side welding pins 1012 and the tail welding pins 1014 of the metal shell 101 need to be tinned during the preparation and processing of the metal shell 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 part, in essence, discloses a method for preparing a metal shell of an electrical connector; specifically, the method for preparing the hardware plate part includes the following steps:

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

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

[0007] Step 3: riveting: placing the electroplated housing into the second mold, opening rivet holes at corresponding positions of the housing, and riveting the first spring sheet and the second spring sheet to the housing;

[0008] Step 4: Bending and forming: bending and folding the corresponding areas of the shell to obtain a finished product.

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

[0010] Defect 1. Before electroplating, a layer of shielding film needs to be applied to the area of ​​the shell that does not need electroplating, that is, a corresponding coating structure must be set at the corresponding position on the production line, so that the shielding film can be applied to the area of ​​the shell that does not need electroplating through the coating structure; in addition, after electroplating, the shielding film on the shell needs to be removed, so there is a shielding film removal process; the above-mentioned shielding film coating process and shielding film removal process will obviously increase the processing process of the shell, which will affect the preparation efficiency of the shell;

[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 coated on the shell surface is inaccurate, the shell electroplating position 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 affect and reduce the yield rate of the shell, thereby increasing the shell preparation 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 electric connector in view of the deficiencies in the prior art. The method for preparing a metal shell of an electric connector can effectively realize the preparation and processing of the metal shell of the electric connector, with fewer steps and a high yield, thereby effectively reducing the preparation and processing cost of the metal shell of the electric connector.

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

[0014] A method for preparing a metal shell of an electric connector, wherein the method for preparing a metal shell of an electric connector sequentially tins the side solder pins and the tail solder pins of the metal shell through 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 back along the material belt conveying mode. The front material guide assembly cooperates with the rear material guide assembly and allows 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 and allows the material belt to pass through the electroplating tin tank in a vertical state. The material belt is turned over 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 comprises the following steps, specifically:

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

[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 and allows the material strip to pass through the brush tinning assembly in a horizontal state, the brush tinning assembly is located at an upper position or a lower position of the material strip, and the metal shells passing through the brush tinning assembly are arranged horizontally, and in the process of the material strip passing through the brush tinning assembly, the brush tinning assembly performs a brush tinning operation and brush-plates the tin material on the side welding foot position of the metal shell;

[0019] Step b, the metal shell that has completed the brush tinning operation is continuously conveyed backward along with the material belt, and enters the front guide wheel assembly after passing through the rear material guide assembly. During this process, the material belt is turned over and adjusted from a horizontal state to a vertical state, and the metal shell that enters the front guide wheel assembly position is in a vertical state;

[0020] Step d, the front guide wheel group guides the material strip flipped to a vertical state into the electroplating tinning tank. During this process, the front guide wheel group cooperates with the rear guide wheel group to make the material strip pass through the electroplating tinning tank in a vertical state; when the material strip carries the metal shell through the electroplating tinning tank, the bent tail of the metal shell on the material strip faces downward and the tail solder pin contacts the electroplating tin liquid in the electroplating tinning tank, so as to complete the immersion tinning operation of the tail solder pin;

[0021] Step e, the metal shell that has completed the tinning process passes through the rear guide wheel set along with the material strip, and then is subjected to black plating treatment 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 which 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 pressing wheel shaft and a lower pressing wheel shaft located below the upper pressing wheel shaft are installed between the left material guide base and the right material guide base. The upper pressing wheel shaft is fastened with an upper material guide pressing wheel, and the lower pressing wheel shaft is fastened with a lower material guide pressing wheel. The upper material guide pressing wheel and the lower material guide pressing wheel are respectively provided with material belt guiding grooves.

[0025] During operation, the material belt passes through the gap between the upper material guide pressing wheel and the lower material guide pressing wheel, and the material belt passes through the material belt guiding 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 slide groove and a second slide groove extending vertically, and a first bearing seat is slidably installed in each first slide 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; second adjusting screws are respectively installed on the upper ends of the left material guide base and the right material guide base corresponding to the second bearing seats, and each second adjusting screw is connected to the corresponding second bearing seat by a threaded connection.

[0028] Wherein, the front guide wheel group and the rear guide wheel group respectively include a guide wheel bracket, each guide wheel bracket is rotatably mounted with two left and right opposite and spaced 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 inlet 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 outlet of the electroplating tin tank.

[0030] The brush tinning assembly 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 welding 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 electro-tinning tank, 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 m / min.

[0034] Compared with the prior art, the present invention has the following beneficial effects. Specifically, the method for preparing the metal shell of the electric connector of the present invention does not need to successively carry out the shielding film covering process and the shielding film removing process, and does not need to carry out the shielding film covering operation at all. That is, the present invention does not have the problems of many steps, low yield and high preparation cost caused by the need to carry out 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 electric 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 electric connector, and can effectively reduce the preparation and processing cost of the metal shell of the electric connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described below with the aid of 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 schematic diagram of the structure of the metal shell of the electrical connector.

[0037] Figure 2 This is a schematic diagram of the structure of the metal shell of the electrical connector from another perspective.

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

[0039] Figure 4 It 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 tin-plating device of the present invention from another perspective.

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

[0042] Figure 7 It 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 placed via brush tinning.

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

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

[0046] exist Figures 1 to 10 Included are:

[0047] 11-front guide assembly; 12-rear guide assembly; 131-left guide base; 132-right guide base; 141-upper pressure wheel shaft; 142-lower pressure wheel shaft; 151-upper guide pressure wheel; 152-lower guide pressure wheel; 153-material belt guide groove; 161-first slide groove; 162-second slide groove; 171-first bearing seat; 172-second bearing seat; 181-first adjustment screw; 182-second adjustment screw Screws; 2-brush tinning assembly; 21-conductive tin wool; 22-positioning block; 221-material strip positioning slot; 31-front guide wheel assembly; 32-rear guide wheel assembly; 33-guide wheel bracket; 34-material strip guide wheel; 4-electroplating tin tank; 100-material strip; 101-metal shell; 1011-shell accommodating cavity; 1012-side weld foot; 1013-bend tail; 1014-tail weld foot; 102-edge material. DETAILED DESCRIPTION

[0048] The present invention is described below in conjunction with specific implementation methods.

[0049] Embodiment 1, as Figures 3 to 5 As shown, a method for preparing a metal shell of an electrical connector is provided. The method for preparing a metal shell of an electrical connector sequentially tins the side solder pins 1012 and the tail solder pins 1014 of the metal shell 101 by a tinning device.

[0050] Specifically, Figures 3 to 5 As shown, the tinning device includes a front material guide component 11, a brush tinning component 2, a rear material guide component 12, a front guide wheel group 31, an electroplating tin tank 4, and a rear guide wheel group 32, which are arranged in sequence from front to back along the conveying mode of the material strip 100. The front material guide component 11 cooperates with the rear material guide component 12 to allow the material strip 100 to pass through the brush tinning component 2 in a horizontal state, the front guide wheel group 31 cooperates with the rear guide wheel group 32 to allow the material strip 100 to pass through the electroplating tin tank 4 in a vertical state, and the material strip 100 is flipped between the rear material guide component 12 and the front guide wheel group 31 and adjusted from a horizontal state to a vertical state.

[0051] The method for preparing the metal housing of the electrical connector includes the following steps, specifically:

[0052] Step a, feeding the metal strip into a stamping die, and the stamping die set stamps and forms the metal shell 101, and the stamped metal shell 101 remains connected with the edge material 102 to form the material strip 100 together;

[0053] Step b: The material belt 100 carrying the metal shell 101 is transported from front to back along the conveying direction of the material belt 100, and the material belt 100 passes through the front guide component 11 and the rear guide component 12, as shown in FIG. Figure 8As shown, the front material guide component 11 cooperates with the rear material guide component 12 to make the material strip 100 pass through the brush tinning component 2 in a horizontal state. The brush tinning component 2 is located at the upper position or the lower position of the material strip 100, and the metal shells 101 passing through the brush tinning component 2 are arranged horizontally. 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 soldering feet 1012 of the metal shell 101;

[0054] Step b: The metal shell 101 after the brush tinning operation is continuously transported backward along with the material belt 100, and enters the front guide wheel assembly 31 after passing through the rear guide assembly 12. Fig. 9 As shown, the material belt 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 group 31 is in a vertical state;

[0055] Step d, the front guide wheel group 31 guides the material strip 100 flipped to a vertical state into the electro-tinning bath 4. During this process, the front guide wheel group 31 cooperates with the rear guide wheel group 32 to allow the material strip 100 to pass through the electro-tinning bath 4 in a vertical state; when the material strip 100 carries the metal shell 101 through the electro-tinning bath 4, the bent tail 1013 of the metal shell 101 on the material strip 100 faces downward and the tail solder pin 1014 contacts the electro-tinning liquid in the electro-tinning bath 4, so as to complete the immersion tinning operation of the tail solder pin 1014;

[0056] Step e: the metal shell 101 that has completed the tinning process passes through the rear guide wheel set 32 ​​along with the material strip 100, and then is subjected to black plating treatment, so that a black protective layer is formed on the surface of the metal shell 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 tinning 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 material guide component 11 and the rear material guide component 12 are firstly matched to make the material strip 100 pass through the brush tinning component 2 in a horizontal state, and 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 are respectively in contact with the brush tinning component 2, so as to realize the brush tinning component 2 on the metal shell The side welding position of 101 is brush tinned; after the side welding foot 1012 of the metal shell 101 is brush tinned, the material strip 100 is flipped 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 face 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.

[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 successively perform the shielding film covering process and the shielding film removing process, 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 fewer 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] Embodiment 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 which 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. The upper material guide pressure wheel 151 and the lower material guide pressure wheel 152 are respectively provided with a material belt 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 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, so as to ensure that the side weld foot 1012 of the metal shell 101 can accurately and reliably complete the brush tinning operation.

[0064] Embodiment three, as Figure 6 and Figure 7 As shown, the difference between the third embodiment and the second embodiment lies in that: the left material guide base 131 and the right material guide base 132 are respectively provided with a first slide groove 161 and a second slide groove 162 extending vertically, and a 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 respectively 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 slide 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, which can enable the material strip 100 to accurately align with the brush tinning operation position on the one hand, and can adapt to the metal shell of the electrical connector of different thicknesses on the other hand. When adjusting, the staff only needs to turn the first adjustment screw 181 or the second adjustment screw 182; when turning the first adjustment screw 181, 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 turning the second adjustment screw 182, 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] Embodiment 4, as Figures 3 to 5As shown, the difference between the 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 mounted 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 belt 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 belt 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 belt guide wheels 34 of the rear guide wheel group 32 is aligned with the discharge port of the electroplating tin tank 4.

[0069] Embodiment 5, as Figure 3 , Figure 4 , Figure 5 as well as Fig.10 As shown, the difference between the fifth embodiment and the first embodiment is that the brush tinning component 2 includes a conductive tin wool 21 for brush-plating tin on the side welding foot 1012 of the metal shell 101, and a positioning block 22 located next to the conductive tin wool 21, and 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 will be changes in the specific implementation methods and application scopes. The content 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 an electric connector comprises sequentially tinning the side welding feet (1012) and the tail welding feet (1014) of the metal shell (101) using a tinning device; The tinning device comprises a front material guide assembly (11), a brush tinning assembly (2), a rear material guide assembly (12), a front guide wheel assembly (31), an electroplating tin tank (4), and a rear guide wheel assembly (32) which are arranged in sequence from front to back along a conveying mode of a material strip (100); the front material guide assembly (11) cooperates with the rear material guide assembly (12) to allow 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) to allow 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 material 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 comprises 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 a front material guide component (11) and a rear material guide component (12), the front material guide component (11) cooperates with the rear material guide component (12) to allow the material strip (100) to pass through a brush tinning component (2) in a horizontal state, the brush tinning component (2) is located at an upper position or a lower position of the material strip (100), and each metal shell (101) passing through the brush tinning component (2) is 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 soldering feet (1012) 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 belt (100), and enters the front guide wheel assembly (31) after passing through the rear material guide assembly (12). During this process, the material belt (100) is turned over and adjusted from a horizontal state to a vertical state, and the metal shell (101) that enters 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 over to a vertical state into the electrotinning tank (4), during which the front guide wheel group (31) cooperates with the rear guide wheel group (32) to allow the material strip (100) to pass through the electrotinning tank (4) in a vertical state; when the material strip (100) carries the metal shell (101) through the electrotinning tank (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 electrotinning liquid in the electrotinning tank (4), so as to complete 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 set (32) along with the material strip (100), and then is subjected to a black plating process, so that a black protective layer is formed 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, characterized in that: The front material guiding component (11) and the rear material guiding component (12) are respectively adjustable material guiding components; The adjustable material guide assembly comprises a left material guide base (131) and a right material guide base (132) which are arranged opposite to each other and spaced apart from each other. 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 arranged 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 guiding 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, characterized in that: 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 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 respectively 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, characterized in that: The front guide wheel group (31) and the rear guide wheel group (32) respectively comprise a guide wheel bracket (33), each guide wheel bracket (33) being rotatably mounted with two material belt guide wheels (34) which are opposite to each other and arranged at intervals on the left and right, and each material belt guide wheel (34) is respectively arranged vertically; The gap between the two material strip guide wheels (34) of the front guide wheel group (31) is aligned with the feed inlet 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 outlet of the electroplating tin tank (4).

5. The method for preparing a metal housing of an electrical connector according to claim 1, characterized in that: The brush tinning component (2) comprises a conductive tin cotton (21) for brush-plating tin on the side welding feet (1012) of the metal shell (101), and a positioning block (22) located next to the conductive tin cotton (21), wherein 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, characterized in that: When the brush tinning component (2) is used to perform brush tinning on the side welding feet (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, characterized in that: When the tail solder pin (1014) of the metal shell (101) is subjected to tinning by means of the electrotinning 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, characterized in that: The speed at which the material strip (100) passes through the tinning device is 6 meters per minute.

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