Manufacturing method of elastic contact electric connection sheet

Abstract

The elastic contact electric connection sheet is a part for realizing electric connection between electronic devices, can replace a multi-point welding electric connection mode, and has the advantages of good reliability, high electric connection efficiency and the like compared with welding connection. However, due to the factors of thin thickness, poor rigidity and the like of a connecting sheet, common etching, numerical control and other methods have the defects of low forming efficiency, easy deformation of a large surface, poor rigidity of a contact, stress deformation and the like. According to the manufacturing method of the elastic contact electric connecting piece, through measures such as clamping die shape preserving, clamping die heat treatment and laser cutting, it is guaranteed that the deformation of a large face is small in the forming process of the contact electric connecting piece, the electric connecting contact has elasticity, meanwhile, the good contact height consistency is achieved, and the manufacturing process is simple and convenient. Through the method, efficient and reliable forming of the contact electric connecting piece can be achieved, the elasticity of the contact is guaranteed, and high-reliability electric connection is met.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic devices, and in particular relates to a method for manufacturing an elastic contact electrical connecting sheet. Background Art

[0002] The elastic contact electrical connector is a part that realizes the electrical connection between electronic devices. It can replace the multi-point welding electrical connection method. Compared with the welding connection, it has the advantages of good reliability and high electrical connection efficiency. However, due to the thin thickness and poor rigidity of the connector, the common etching and CNC methods have the disadvantages of low molding efficiency, easy deformation of large surfaces, and poor rigidity of contacts and deformation under stress. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and propose a method for manufacturing an elastic contact electrical connection sheet. Through clamping mold conformation, clamping mold heat treatment, laser cutting and other measures, it is ensured that the large surface deformation of the contact electrical connection sheet is small during the molding process, and the electrical connection contacts are elastic and have good contact height consistency. This method can realize efficient and reliable molding of the contact electrical connection sheet, ensure contact elasticity, and meet high-reliability electrical connection. It includes the following steps:

[0004] 1. Clamping → 2. Contact forming → 3. Heat treatment → 4. Demolding → 5. Shape processing.

[0005] The detailed description of each step is as follows:

[0006] Step 1: Clamp the mold: Clean the metal sheet and the mold, clamp the metal sheet between the upper and lower molds and tighten them

[0007] 1.1 Prepare 0.1mm beryllium bronze plate, the material state is Qbe2 C, and the double-side allowance is 10mm.

[0008] 1.2 According to the size and shape of the part contact, design and process the upper and lower dies for clamping. The upper and lower dies are positioned by positioning pins. Screw mounting holes are reserved around the die for clamping. The lower die is reserved at the contact position. The upper die is reserved at the contact position for the punch hole. The drilling guide sleeve is assembled at the avoidance position of the part. The upper and lower template tooling is attached. Figure 1 .

[0009] 1.3 Clean the beryllium bronze sheet and the mold, place the sheet in the center of the lower mold, tighten the upper mold and then tighten the upper and lower molds with screws. See the attached diagram for the clamping state. Figure 2 .

[0010] Step 2: Contact forming: Use a punch to impact and form raised contacts

[0011] 2.1 The punch is processed according to the contact shape. The punch material is precipitation hardened stainless steel. The surface is QPQ treated after solution aging to ensure the strength and hardness of the punch.

[0012] 2.2 Use a soft hammer to hit the punch at the reserved punching position of the upper die, and the beryllium bronze plate will deform to form contacts. All contacts are formed by impacting in sequence. The contact forming status is shown in the attached Figure 3 .

[0013] Step 3: Heat treatment: Heat treatment is performed in the clamping state to ensure the elasticity of the connecting piece

[0014] 3.1 In the clamped state, the mold and parts are placed in a vacuum furnace for aging treatment to make the beryllium bronze sheet elastic.

[0015] Step 4: Demolding: Process internal positioning holes at the corresponding positions of the template, remove the mold and take out the parts

[0016] 4.1 After heat treatment, use the guide sleeve reserved on the upper die and use a drill to machine the internal positioning hole.

[0017] 4.2 After the internal positioning and processing is completed, the mold is removed and the bronze sheet is taken out. The state of removing the mold and taking out the parts is shown in the attached Figure 4 .

[0018] Step 5: Shape processing: Laser cutting to process the shape and avoidance holes, and forming the elastic contact electrical connection piece.

[0019] 5.1 Use the profiling block to fix the beryllium bronze sheet, use the laser equipment to perform visual positioning according to the processed internal positioning holes, cut the shape and avoidance holes to form the final shape, and the laser forming status is shown in the attached Figure 5 .

[0020] The beneficial effects of the present invention are

[0021] The invention solves the problems of severe deformation of large surface and inelasticity of contacts during the forming process of elastic contact electrical connecting pieces. It can replace welding electrical connection solutions, realize fast multi-point electrical connection, and improve the reliability of electrical connection. It is suitable for conformal processing of thin plate parts such as electrical connecting pieces in the electronic assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the upper and lower template diagram.

[0023] Figure 2 This is a copper plate clamping mold diagram.

[0024] Figure 3 This is the contact forming diagram.

[0025] Figure 4 This is the diagram for removing the mold and taking out the parts.

[0026] Figure 5 This is a laser forming diagram. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] This embodiment is a method for manufacturing a certain type of elastic contact electrical connection sheet. The contact copper plate has a thickness of 0.1 mm, an outer dimension of 243x49, a contact height of 0.3 mm, a total of 56 groups of contacts, each group of 4 contacts, and the molding process includes the following steps:

[0029] Step 1: Clamp the mold: Clean the metal sheet and the mold, clamp the metal sheet between the upper and lower molds and tighten them

[0030] 1.1 The material of the metal sheet is 0.1mm beryllium bronze, the material state is Qbe2 C, and the size of the metal sheet is 0.1x233x59.

[0031] 1.2 According to the size and shape of the part contacts, special clamping upper and lower dies are designed and processed. The upper and lower dies are positioned by locating pins, and screw mounting holes are reserved around them for clamping the dies. The lower die reserves a nest at the contact position. The nest has a taper of 120° and a depth of 0.35mm. The upper die reserves a punch hole at the contact position, and a drilling guide sleeve is assembled at the part avoidance position. The inner diameter of the guide sleeve is 2.9mm.

[0032] 1.3 Use alcohol to clean the beryllium bronze sheet and the mold, place the sheet in the center of the lower mold, press the upper mold tightly, and then tighten the upper and lower molds with screws.

[0033] Step 2: Contact forming: Use a punch to impact and form raised contacts

[0034] 2.1 The punch is processed according to the contact shape. The end of the punch is spherical with a spherical diameter of 0.5 mm. The punch material is 05Cr17Ni4Cu4Nb. The surface is QPQ treated after solid solution aging, and the hardness is HRC45.

[0035] 2.2 Use a soft hammer to hit the punch 3 times at the reserved punching position of the upper die. The beryllium bronze plate is deformed to form contacts with a contact height of 0.3mm. All contacts are formed in sequence. There are 4 contacts in each group, and a single part has 56 groups of contacts in total.

[0036] Step 3: Heat treatment: Heat treatment is performed in the clamping state to ensure the elasticity of the connecting piece

[0037] 3.1 Use special cleaning agent to clean the parts.

[0038] 3.2 Place the parts into a special mold to ensure that the parts fit the mold.

[0039] 3.3 In the clamped state, place the mold and parts as a whole in a vacuum furnace for aging treatment at a temperature of 320°C for 3 hours, and the beryllium bronze sheet will become elastic.

[0040] Step 4: Demolding: Process internal positioning holes at the corresponding positions of the template, remove the mold and take out the parts

[0041] 4.1 After heat treatment, use the guide sleeve reserved on the upper die and a 2.9mm drill bit to machine the internal positioning holes.

[0042] 4.2 After the internal positioning and processing are completed, remove the mold and take out the bronze sheet.

[0043] Step 5: Shape processing: Laser cutting of the shape and avoidance holes, and forming of the elastic contact electrical connection sheet

[0044] 5.1 Use the profiling block to fix the beryllium bronze sheet, use the laser equipment for visual positioning according to the processed internal positioning holes, and cut the shape and avoidance holes to form the final shape.

[0045] The present invention is not limited to the above specific implementations, and the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made to the above implementations based on the technical essence of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for manufacturing an elastic contact electrical connecting sheet, characterized in that: The steps include: Step 1: Clamp the mold: clamp the metal sheet between the upper and lower molds and tighten them; Step 2: Contact forming: Use a punch to impact and form a raised contact at a specified position; Step 3: Heat treatment: Heat treatment is performed in the clamping state to ensure the elasticity of the connecting piece; Step 4: Demolding: Process internal positioning holes at the corresponding positions of the template, remove the mold and take out the parts; Step 5: Shape processing: Laser cutting to process the shape and avoidance holes, and forming the elastic contact electrical connection piece.

2. The method for manufacturing a resilient contact electrical connecting sheet according to claim 1, characterized in that: The first step comprises: 1.1 Prepare 0.1mm thick beryllium bronze plate, material state is Qbe2 C, double-sided allowance is 10mm; 1.2 According to the size and shape of the part contact, use a fixture to clamp the upper and lower molds. The upper and lower molds are positioned by positioning pins. Screw mounting holes are reserved around the mold for clamping the mold. The lower mold reserves a nest at the contact position, and the upper mold reserves a punch hole at the contact position. The drilling guide sleeve is installed at the avoidance position of the part; 1.3 Clean the beryllium bronze plate and the mold, place the beryllium bronze plate in the center of the lower mold, tighten the upper mold and then tighten the upper and lower molds with screws.

3. The method for manufacturing a resilient contact electrical connecting sheet according to claim 2, characterized in that: The upper and lower molds are both made of stainless steel, and the flatness of the large surface is within 3 threads.

4. The method for manufacturing a resilient contact electrical connecting sheet according to claim 1, characterized in that: The second step includes: 2.1 The punch is processed according to the contact shape. The punch material is precipitation hardened stainless steel, and the surface is QPQ treated after solution aging; 2.2 Use a soft hammer to hit the punch at the reserved punching position of the upper die, and the beryllium bronze plate will deform to form contacts. All contacts are formed by impacting in sequence.

5. The method for manufacturing a resilient contact electrical connecting sheet according to claim 1, characterized in that: The third step includes: in the clamped state, placing the mold and the parts as a whole in a vacuum furnace for aging treatment at a temperature of 320° C. for 3 hours. After the heat treatment, the large surface of the beryllium bronze sheet is flat and the contacts are elastic.

6. The method for manufacturing a resilient contact electrical connecting sheet according to claim 1, characterized in that: The fourth step comprises: 4.1 After heat treatment, use the guide sleeve reserved on the upper die and use a drill to machine the internal positioning hole; 4.2 After the internal positioning and processing are completed, remove the mold and take out the bronze sheet.

7. The method for manufacturing a resilient contact electrical connecting sheet according to claim 1, characterized in that: The fifth step includes: fixing the beryllium bronze sheet by using a contoured pressing block, performing visual positioning by using a laser device according to the processed internal positioning holes, cutting the outer shape and avoidance holes, and finally forming the shape.

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