Terminal hardness and plugging force adjusting method

Abstract

The invention relates to the technical field of connectors, and discloses a terminal hardness and plugging force adjusting method. The terminal hardness and insertion and extraction force adjusting method comprises the following steps: step 1, calculating an adjusted theoretical insertion and extraction force according to a theoretical hardness value under the condition that a terminal material is not changed; 2, changing the hardness of the terminal, and carrying out a terminal insertion and extraction force test to enable the actual insertion and extraction force to be close to the adjusted theoretical insertion and extraction force; if the difference between the actual insertion and extraction force and the adjusted theoretical insertion and extraction force is greater than or equal to a preset threshold value, repeating the step 2; if the difference between the actual insertion and extraction force and the adjusted theoretical insertion and extraction force is smaller than a preset threshold value, insertion and extraction force adjustment is stopped, and the mapping relation between the current actual hardness and the actual insertion and extraction force is stored. The invention provides a terminal hardness and plugging force adjusting method, which comprises the following steps of: calculating adjusted theoretical plugging force according to a theoretical hardness value, and then changing the hardness of a terminal and measuring actual plugging force, so that the actual plugging force is infinitely close to the integrated theoretical plugging force to obtain the optimal plugging force suitable for the terminal. And the terminal is smoothly inserted and pulled out and is not easy to fall off at the same time. After the mapping relation between the current actual hardness and the actual insertion and extraction force is stored, the mapping between the current actual hardness and the actual insertion and extraction force can be utilized to indicate the batch production of the terminal.

Description

Technical Field

[0001] The present invention relates to the technical field of connectors, and in particular to a method for adjusting the hardness and plugging and pulling force of connector terminals. Background Art

[0002] Connectors are used to connect two circuit devices and are widely used in electronic devices. Connectors include male and female sockets, both of which are composed of a plastic shell and a terminal, one end of which is welded on the circuit board.

[0003] like Figure 1 As shown, the terminals of the connector include male terminals and female terminals. The female terminals include jacks, which are surrounded by ring buckles. Three groups of tilted elastic extrusion parts are connected to the bottom of the ring buckles, and one group of elastic extrusion parts is connected to the welding part. When the male terminal is inserted into the female terminal, the insertion force and the extraction force will affect the transmission performance and structural performance of the terminal. If a large force is required for insertion, a large force is also required for extraction, and insertion and extraction are inconvenient; if the insertion and extraction forces are small, the force connection between the male terminal and the female terminal is weak, easy to separate, and signal transmission is unstable. In order to adjust the appropriate plug-in and extraction force, in the prior art, the plug-in and extraction force is often adjusted by adjusting the elastic extrusion part. At the same time, in the prior art, the plug-in and extraction force is also adjusted by replacing different materials, but using different materials for the terminal will affect the terminal signal transmission rate. Summary of the invention

[0004] Based on the above, the object of the present invention is to provide a method for adjusting the hardness and plugging force of a connector terminal, and to obtain the best plugging force suitable for the terminal by adjusting the relationship between the hardness and the plugging force.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a method for adjusting the hardness and insertion and extraction force of a terminal, wherein the terminal comprises a male terminal and a female terminal, wherein the female terminal comprises a socket, and the socket is surrounded by an annular buckle, and three groups of inclined elastic extrusion parts are connected below the annular buckle, and one group of the elastic extrusion parts is connected to a welding part;

[0007] The terminal hardness and insertion force adjustment method includes the following steps:

[0008] Step 1: Calculate the adjusted theoretical insertion and extraction force based on the theoretical hardness value while keeping the terminal material unchanged;

[0009] Step 2: Changing the hardness of the terminal and performing a terminal plugging and pulling force test so that the actual plugging and pulling force is close to the adjusted theoretical plugging and pulling force;

[0010] If the difference between the actual insertion force and the adjusted theoretical insertion force is greater than or equal to the preset threshold, repeat step 2;

[0011] If the difference between the actual plugging force and the adjusted theoretical plugging force is less than a preset threshold, the plugging force adjustment is stopped and the mapping relationship between the current actual hardness and the actual plugging force is saved.

[0012] Preferably, changing the hardness of the terminal comprises the following steps:

[0013] Clean the terminal surface;

[0014] heating the terminal to a set temperature, wherein the set temperature is lower than a critical temperature of the terminal;

[0015] After reaching the set temperature, set the insulation time to 1 to 2 hours;

[0016] After the insulation is completed, the terminal temperature is slowly cooled down, and a protective atmosphere is filled in during the cooling process;

[0017] After cooling to room temperature, the terminals were hardness tested.

[0018] Preferably, calculating the adjusted theoretical insertion and extraction force according to the theoretical hardness value comprises the following steps:

[0019] Enter the Brinell hardness value H of the terminal;

[0020] According to the hardness value H, the corresponding friction coefficient μ is searched from the preset hardness-friction coefficient mapping table;

[0021] According to the hardness value H, determining the elastic modulus E of the terminal material from a preset hardness-elastic modulus mapping table;

[0022] Calculate the elastic modulus adjustment factor AF_elastic, AF_elastic = 1 / E;

[0023] Calculate the hardness adjustment factor AF_hardness, the calculation formula is: AF_hardness = μ × AF_elastic;

[0024] According to the standard theoretical insertion and extraction force F_std and the hardness adjustment factor AF_hardness, the adjusted theoretical insertion and extraction force F_adj is calculated, and the calculation formula is: F_adj = F_std × AF_hardness;

[0025] The friction coefficient μ represents the friction characteristics of the surface of the terminal material; the elastic modulus E represents the degree of elasticity of the terminal when subjected to force; the elastic modulus adjustment factor AF_elastic represents the factor for adjusting the plugging and unplugging force based on the elastic modulus of the material, which is simplified here as the inverse of the elastic modulus; the hardness adjustment factor AF_hardness represents the adjustment factor that comprehensively considers the influence of the friction coefficient and the elastic modulus; the standard theoretical plugging and unplugging force F_std represents the theoretical plugging and unplugging force under standard conditions; and F_adj represents the adjusted theoretical plugging and unplugging force corrected by the hardness adjustment factor.

[0026] Preferably, the preset threshold is predetermined according to the application environment and performance requirements of the terminal and can be adjusted.

[0027] Preferably, the hardness-friction coefficient mapping table and the hardness-elastic modulus mapping table are established based on experimental data and are regularly updated according to new experimental data.

[0028] Preferably, the step of calculating the adjusted theoretical insertion and extraction force F_adj further includes a calibration factor.

[0029] Preferably, the protective atmosphere is a selected inert gas.

[0030] The beneficial effects of the present invention are:

[0031] The present invention provides a method for adjusting the hardness and plugging force of a connector terminal. The method first calculates the adjusted theoretical plugging force through the theoretical hardness value, and then measures the actual plugging force by changing the hardness of the terminal, so that the actual plugging force is infinitely close to the adjusted theoretical plugging force, and the best plugging force suitable for the terminal is obtained. The terminal is smooth when inserted and removed, and is not easy to fall off. After saving the mapping relationship between the current actual hardness and the actual plugging force, the mapping between the current actual hardness and the actual plugging force can be used to indicate the batch production of the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0033] Figure 1 A schematic diagram of the structure of a connector terminal provided by an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the structure of a connector female terminal provided in an embodiment of the present invention;

[0035] Figure 3 A flow chart of a method for adjusting the hardness and insertion and extraction force of a connector terminal provided by an embodiment of the present invention;

[0036] Figure 4 A flow chart of changing the hardness of a terminal provided by an embodiment of the present invention;

[0037] Figure 5 A flow chart of calculating the adjusted theoretical insertion and extraction force according to the theoretical hardness value provided in an embodiment of the present invention;

[0038] Figure 6 A schematic diagram of the specific structure of the clamping assembly provided in an embodiment of the present invention;

[0039] Figure 7 This is a diagram of the insertion and extraction force experiment measured at a hardness of 220 according to an embodiment of the present invention;

[0040] Figure 8 This is a diagram of the insertion and extraction force experiment measured at a hardness of 340 according to an embodiment of the present invention;

[0041] Fig. 9 The experimental diagram of the insertion and extraction force obtained at a hardness of 280 according to the embodiment of the present invention is shown in FIG.

[0042] In the figure:

[0043] 1. Female terminal; 11. Socket; 12. Ring buckle; 13. Elastic extrusion portion; 14. Welding portion; 2. Male terminal; 3. Female; 4. Male; 5. Circuit board; 6. Clamping assembly; 61. First clamping portion; 62. Second clamping portion; 63. Clamping recess. DETAILED DESCRIPTION

[0044] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0048] The embodiment of the present invention provides a method for adjusting the hardness and insertion force of a terminal. Figure 1 and 2 As shown, the terminal includes a male terminal 2 and a female terminal 1, the female terminal 1 includes a socket 11, the socket 11 is surrounded by a ring buckle 12, and three groups of inclined elastic extrusion parts 13 are connected below the ring buckle 12, one group of elastic extrusion parts 13 is connected to a welding part 14, and the welding part 14 is mainly used to connect the circuit board;

[0049] like Figure 3 As shown, the terminal hardness and insertion force adjustment method includes the following steps:

[0050] Step 1: Under the condition that the terminal material remains unchanged, the adjusted theoretical plugging and pulling force is calculated according to the theoretical hardness value; the material of the terminal is preferably copper or copper alloy, such as beryllium copper, etc. The theoretical hardness value mainly refers to the theoretical hardness value of the terminal, which is expressed by the Brinell hardness value H. The plugging and pulling force mainly consists of the insertion force and the extraction force. The optimal plugging and pulling force is theoretically that the insertion force is equal to the extraction force;

[0051] Step 2: Change the hardness of the terminal and perform a terminal plugging and unplugging force test so that the actual plugging and unplugging force is close to the adjusted theoretical plugging and unplugging force; the actual plugging and unplugging force is the plugging and unplugging force of the terminal actually measured, as shown in the figure. Figure 6As shown, the male terminal 2 is fixed in the male socket 4, and the female terminal 1 is fixed in the female socket 3. The male terminal 2 and the female terminal 1 are respectively welded and connected to the circuit board 5. The circuit board 5 connected to the female socket 3 and the circuit board 5 connected to the male socket 4 are both clamped by the clamping assembly 6. The clamping assembly 6 includes a first clamping portion 61 and a second clamping portion 62. The first clamping portion 61 and the second clamping portion 62 are correspondingly provided with clamping recesses 63. The distance between the two clamping recesses 63 of the first clamping portion 61 and the second clamping portion 62 can be adjusted to adapt to different widths of the circuit board 5. The two sides of the circuit board are inserted into the clamping recesses 63. When the circuit board is clamped, the upper and lower clamping assemblies 6 are separated and closed by the driving assembly to simulate the insertion and extraction of the male socket 4 and the female socket 3, thereby measuring the actual insertion force and extraction force.

[0052] If the difference between the actual plugging and unplugging force and the adjusted theoretical plugging and unplugging force is greater than or equal to the preset threshold, repeat step 2; if the difference between the actual plugging and unplugging force and the adjusted theoretical plugging and unplugging force is less than the preset threshold, stop the plugging and unplugging force adjustment and save the current actual hardness and actual plugging and unplugging force mapping relationship. It should be noted that the preset threshold is predetermined according to the application environment and performance requirements of the terminal and can be adjusted.

[0053] The embodiment of the present invention provides a method for adjusting the hardness and plugging force of a connector terminal. The method first calculates the adjusted theoretical plugging force through the theoretical hardness value, and then measures the actual plugging force by changing the hardness of the terminal, so that the actual plugging force is infinitely close to the adjusted theoretical plugging force, and the best plugging force suitable for the terminal is obtained. The terminal is smooth when inserted and removed, and is not easy to fall off. After saving the mapping relationship between the current actual hardness and the actual plugging force, the mapping between the current actual hardness and the actual plugging force can be used to indicate the batch production of the terminal.

[0054] In the embodiment of the present invention, a terminal made of beryllium copper is used as an example. Assuming that the theoretical hardness is 280, the adjusted theoretical plugging and unplugging force is calculated to be 45N, and the preset threshold is set to be 5N. Figure 7 As shown, the actual hardness at the beginning is 220, the red line is the insertion force change, and the green line is the pull-out force change. Figure 7 It can be seen that the insertion force and the extraction force are uneven, and the insertion force and the extraction force are quite different, and the insertion force and the extraction force are far beyond the preset threshold. Figure 8 As shown, the actual hardness after the change is 340, from Figure 8 It can be seen that although the insertion force and the extraction force are uniform and close to each other, the insertion force and the extraction force are far beyond the preset threshold. Fig. 9 As shown, the actual hardness after the change is 280, from Fig. 9It can be seen that the insertion force and the extraction force are uniform, and the insertion force and the extraction force are within the preset threshold range. The mapping relationship between the current actual hardness and the actual insertion and extraction force can be saved. The mapping between the current actual hardness and the actual insertion and extraction force can be used to indicate the mass production of the terminals.

[0055] As a preferred embodiment of the present invention, Figure 4 As shown, changing the hardness of the terminal includes the following steps:

[0056] Clean the terminal surface, mainly to remove oil, rust or other contaminants on the terminal mask. In order to improve the cleaning efficiency, ultrasonic cleaning or chemical cleaning can be used for cleaning;

[0057] The terminal is heated to a set temperature, which is lower than the critical temperature of the terminal. The critical temperature of the terminal is set according to the critical stability of different materials. In order to achieve precise temperature control, a high-precision temperature control box system can be used for heating;

[0058] After reaching the set temperature, set the insulation time to 1 to 2 hours. It should be noted that the specific insulation time is determined based on the terminal material and the required performance changes. After completing the heating and insulation, record key parameters such as temperature, time, etc. in real time.

[0059] After the insulation is completed, the terminal temperature is slowly cooled. During the cooling process, a protective atmosphere is filled; the protective atmosphere is a selected inert gas, such as nitrogen, argon, etc., to prevent the terminal from being oxidized or corroded during the cooling process.

[0060] After cooling to room temperature, the terminals were hardness tested.

[0061] As a preferred embodiment of the present invention, Figure 5 As shown, calculating the adjusted theoretical insertion and extraction force according to the theoretical hardness value includes the following steps:

[0062] Enter the Brinell hardness value H of the terminal;

[0063] According to the hardness value H, the corresponding friction coefficient μ is found from the preset hardness-friction coefficient mapping table; before finding the corresponding friction coefficient μ in the preset hardness = friction coefficient mapping table, it is necessary to create a hardness-friction system mapping table. Creating a hardness-friction system mapping table includes the following steps: data collection, collecting friction coefficient data under different material hardnesses through experimental measurement or literature research; data collation: classifying and collating the collected data according to the hardness value; optionally establishing a model, establishing a mathematical model to describe the relationship between hardness and friction coefficient; drawing a table: drawing a table based on the collated data to ensure the readability and accuracy of the data; verification and update: using new experimental data or feedback information to continuously verify and update the mapping table.

[0064] According to the hardness value H, the elastic modulus E of the terminal material is determined from the preset hardness-elastic modulus mapping table; before determining the elastic modulus E of the terminal material in the preset hardness-elastic modulus mapping table, it is necessary to create a hardness-elastic modulus mapping table, and the creation of the hardness-elastic modulus mapping table includes the following steps: data collection: collecting elastic modulus data of materials with different hardness; data analysis: analyzing the data to determine the relationship between hardness and elastic modulus; optionally, establishing a model; establishing a mathematical model to describe the relationship between the hardness value and the corresponding elastic modulus value, it can be listed that there is a linear relationship between the hardness value H and the elastic modulus E, which can be expressed by the following linear equation: E = k·H+b where k is a proportional constant, indicating the strength of the linear relationship between the hardness and the elastic modulus, and b is an intercept, indicating the elastic modulus value when the hardness is zero; drawing a table: creating a table to list the hardness value and the corresponding elastic modulus value. Verification and update: verify the accuracy of the mapping table through additional experiments or data, and update the mapping table regularly according to new data or technological advances.

[0065] Calculate the elastic modulus adjustment factor AF_elastic, AF_elastic = 1 / E;

[0066] Calculate the hardness adjustment factor AF_hardness, the calculation formula is: AF_hardness = μ × AF_elastic;

[0067] According to the standard theoretical insertion and extraction force F_std and the hardness adjustment factor AF_hardness, the adjusted theoretical insertion and extraction force F_adj is calculated, and the calculation formula is: F_adj = F_std × AF_hardness;

[0068] The friction coefficient μ represents the friction characteristics of the surface of the terminal material; the elastic modulus E represents the degree of elasticity of the terminal when subjected to force; the elastic modulus adjustment factor AF_elastic represents the factor for adjusting the plugging and unplugging force based on the elastic modulus of the material, which is simplified here as the inverse of the elastic modulus; the hardness adjustment factor AF_hardness represents the adjustment factor that comprehensively considers the influence of the friction coefficient and the elastic modulus; the standard theoretical plugging and unplugging force F_std represents the theoretical plugging and unplugging force under standard conditions; and F_adj represents the adjusted theoretical plugging and unplugging force corrected by the hardness adjustment factor.

[0069] As a preferred manner of an embodiment of the present invention, the hardness-friction coefficient mapping table and the hardness-elastic modulus mapping table are established based on experimental data and are regularly updated according to new experimental data.

[0070] As a preferred embodiment of the present invention, the step of calculating the adjusted theoretical plugging and pulling force F_adj also includes a calibration factor for taking into account the specific geometric shape of the terminal and the uneven distribution of the material.

[0071] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for adjusting terminal hardness and plugging force, characterized in that: The terminal comprises a male terminal and a female terminal, the female terminal comprises a socket, the socket is surrounded by a ring buckle, three groups of inclined elastic extrusion parts are connected below the ring buckle, and one group of elastic extrusion parts is connected to a welding part; The terminal hardness and insertion force adjustment method includes the following steps: Step 1: Calculate the adjusted theoretical insertion and extraction force based on the theoretical hardness value while keeping the terminal material unchanged; Step 2: Changing the hardness of the terminal and performing a terminal plugging and pulling force test so that the actual plugging and pulling force is close to the adjusted theoretical plugging and pulling force; If the difference between the actual insertion force and the adjusted theoretical insertion force is greater than or equal to the preset threshold, repeat step 2; If the difference between the actual plugging force and the adjusted theoretical plugging force is less than a preset threshold, the plugging force adjustment is stopped and the mapping relationship between the current actual hardness and the actual plugging force is saved.

2. The method for adjusting terminal hardness and insertion force according to claim 1, characterized in that: Changing the hardness of the terminal involves the following steps: Clean the terminal surface; heating the terminal to a set temperature, wherein the set temperature is lower than a critical temperature of the terminal; After reaching the set temperature, set the insulation time to 1 to 2 hours; After the insulation is completed, the terminal temperature is slowly cooled down, and a protective atmosphere is filled in during the cooling process; After cooling to room temperature, the terminals were hardness tested.

3. The terminal hardness and plug-in force adjustment method according to claim 1, characterized in that: Calculating the adjusted theoretical insertion and extraction force based on the theoretical hardness value includes the following steps: Enter the Brinell hardness value H of the terminal; According to the hardness value H, the corresponding friction coefficient μ is searched from the preset hardness-friction coefficient mapping table; According to the hardness value H, determining the elastic modulus E of the terminal material from a preset hardness-elastic modulus mapping table; Calculate the elastic modulus adjustment factor AF_elastic, AF_elastic = 1 / E; Calculate the hardness adjustment factor AF_hardness, the calculation formula is: AF_hardness = μ × AF_elastic; According to the standard theoretical insertion and extraction force F_std and the hardness adjustment factor AF_hardness, the adjusted theoretical insertion and extraction force F_adj is calculated, and the calculation formula is: F_adj = F_std × AF_hardness; The friction coefficient μ represents the friction characteristics of the surface of the terminal material; the elastic modulus E represents the degree of elasticity of the terminal when subjected to force; the elastic modulus adjustment factor AF_elastic represents the factor for adjusting the plugging and unplugging force based on the elastic modulus of the material, which is simplified here as the inverse of the elastic modulus; the hardness adjustment factor AF_hardness represents the adjustment factor that comprehensively considers the influence of the friction coefficient and the elastic modulus; the standard theoretical plugging and unplugging force F_std represents the theoretical plugging and unplugging force under standard conditions; and F_adj represents the adjusted theoretical plugging and unplugging force corrected by the hardness adjustment factor.

4. The method for adjusting terminal hardness and insertion force according to claim 3, characterized in that: The preset threshold is predetermined according to the application environment and performance requirements of the terminal and can be adjusted.

5. The method for adjusting terminal hardness and insertion force according to claim 3, characterized in that: The hardness-friction coefficient mapping table and the hardness-elastic modulus mapping table are established based on experimental data and are regularly updated according to new experimental data.

6. The method for adjusting terminal hardness and insertion force according to claim 3, characterized in that: The step of calculating the adjusted theoretical insertion and extraction force F_adj also includes a calibration factor.

7. The method for adjusting terminal hardness and insertion force according to claim 2, characterized in that: The protective atmosphere is a selected inert gas.

Images