A wire welding machine joint head leaf spring bearing consistency detection method and detection system

Abstract

The present invention provides a method and system for detecting the consistency of the leaf spring bearing of the welding machine. The detection method includes: the driver does not output current, and the leaf spring bearing is fine-tuned to make the main body of the welding machine in a horizontal position; the current output of the driver is increased or decreased to make the main body of the welding machine move to the positive and negative limit positions, and the current output of the driver is recorded; according to the position information of the positive and negative limit positions, the total stroke of the main body of the welding machine is divided into equal parts; the current output of the driver is changed to make the main body of the welding machine move to each equally divided point position, and the current output of each point is recorded; the above-mentioned recorded data is linearly fitted by a computer to obtain a fitting coefficient for describing the characteristics of the detected system; according to the requirements that the fitting coefficient must meet the consistency quantitative index and the mechanical design index, whether each leaf spring bearing meets the consistency requirement is detected. The method and system for detecting the consistency of the leaf spring bearing of the welding machine of the present invention can effectively improve the welding accuracy and product qualification rate.

Description

Technical Field

[0001] The invention relates to the technical field of welding equipment, and in particular to a method and a system for detecting the consistency of a bearing of a leaf spring of a wire welding machine. Background Art

[0002] During the welding process of the wire bonder, the welding movement is completed by the bonding mechanism to realize the wire bonding process between the chip pins. In the process of implementing the same welding process for mass production, the consistency of the bonding mechanism performance between machines greatly affects the chip welding production results of different machines, and has a direct impact on the final welding production qualification rate of the chip.

[0003] The leaf spring bearing is the connection point between the main body of the bang head and the base. The voice coil motor on the main body of the bang head is used as the driving source to move at high speed with the leaf spring bearing as the swing fulcrum. During the movement, the leaf spring bearing will generate spring force directly applied to the main body of the bang head. This force will affect the movement performance of the main body of the bang head, and then affect the welding wire accuracy. If the mechanical properties of the leaf spring bearing are inconsistent, the force generated on the main body of the bang head will also be inconsistent, which will cause wire bonding failure problems such as debonding and bond point breakage when welding the main body of the bang head under the same production process conditions. It can be seen that the consistency of the movement performance of the main body of the bang head is closely related to the consistency of the leaf spring bearing.

[0004] Because the spring force of the leaf spring bearing directly acts on the bond head, if the consistency of the mechanical properties (spring force) of the leaf spring bearing is greatly different, the spring force acting on the bond head body will also be greatly different, which will affect the movement performance of the bond head body and ultimately affect the welding accuracy of the bond head mechanism.

[0005] In addition, after the leaf spring bearing is assembled into the binding head mechanism, when the binding head body swings up and down with the leaf spring bearing as the swing fulcrum, the spring force direction of the leaf spring bearing is parallel to the tangent direction of the leaf spring bearing; at this time, it is not convenient for a spring dynamometer or a general force sensor device to directly measure, and the existing spring force detection equipment cannot realize consistency detection of the performance of the leaf spring bearing.

[0006] Therefore, it is necessary to design a spring force performance consistency detection system for the leaf spring bearing of the wire welding machine. Summary of the invention

[0007] The present invention provides a wire welding machine header leaf spring bearing consistency detection method and detection system which can effectively screen out non-standard leaf spring bearing parts with consistent performance and eliminate unqualified leaf spring bearings with large differences, thereby improving welding accuracy and product qualification rate.

[0008] The technical solution adopted by the present invention is: a wire welding machine bungee leaf spring bearing consistency detection method, which adopts a wire welding machine bungee leaf spring bearing consistency detection system for detection, and the wire welding machine bungee leaf spring bearing consistency detection system includes a bungee mechanism, a driver and a computer;

[0009] The binding head mechanism is connected to the driver and the computer, and the driver drives the binding head mechanism to move; the computer is installed with the host computer software, and the host computer software detects and records the movement of the binding head mechanism;

[0010] The bang head mechanism includes a base and a bang head body; the base is provided with a connecting bracket, the bang head body is installed on the connecting bracket through a leaf spring bearing, the bang head body is connected to a voice coil motor, and the voice coil motor drives the bang head body to swing up and down with the leaf spring bearing as a swing fulcrum;

[0011] A grating position sensor and a grating ruler are installed at the bottom of the connecting bracket. The grating position sensor is connected to a computer to read the scale of the grating ruler.

[0012] The following steps are involved:

[0013] Hovering position detection: Install the leaf spring bearing, the driver does not output current, read the position information fed back by the grating position sensor at this time, and fine-tune the leaf spring bearing according to the position information fed back by the grating position sensor to make the main body of the Bang head in a horizontal position;

[0014] Limit test: Increase the current output of the driver so that the voice coil motor drives the main body of the pop head to move to the positive limit position, and record the current output of the driver at this time; decrease the current output of the driver so that the voice coil motor drives the main body of the pop head to move to the negative limit position, and record the current output of the driver at this time;

[0015] Test of stroke position at equally divided points: according to the position information of the positive limit position and the negative limit position fed back by the grating position sensor, the total stroke of the main body of the bang head is equally divided; the current output of the driver is changed so that the voice coil motor drives the main body of the bang head to move to each equally divided point correspondingly, and the current output of each point at this time is recorded;

[0016] Data fitting: Linearly fit the position information fed back by the grating position sensor and the current output data of the driver recorded in the above steps through a computer:

[0017] Among them, X is the position information, and Y is the current output;

[0018] Judgment on meeting consistency requirements: Taking the design range of the stiffness coefficient of the leaf spring bearing as the fitting constraint condition, two fitting data, the stiffness coefficient K of the leaf spring bearing and the free state value b of the leaf spring bearing, are obtained. According to the requirements that the two fitting data must meet the consistency quantitative indicators and mechanical design indicators, detect whether each leaf spring bearing meets the consistency requirements.

[0019] Furthermore, in the hovering position detection, the difference between the measured hovering position of the machine and the mechanically designed hovering position shall not exceed the error detection threshold of 10%.

[0020] Furthermore, in data fitting, a least squares fitting algorithm with partial spatial constraints is used by computer for linear fitting.

[0021] Furthermore, in the limit test, it is ensured that the current output values ​​at the positive limit position and the negative limit position are both within the design range of the driver operating current.

[0022] Furthermore, in the stroke position test of the equally divided points, the total stroke of the Bang head body is divided into eight sections, including seven equally divided points.

[0023] Furthermore, in the judgment of meeting the consistency requirements, the requirements for the consistency quantitative indicators and mechanical design indicators are within the ±3σ range of the mechanical design parameters, where σ is the standard deviation of the normal distribution of the force constant.

[0024] The present invention also provides a wire welding machine bungee leaf spring bearing consistency detection system, which adopts the above-mentioned wire welding machine bungee leaf spring bearing consistency detection method for detection, and also includes a power module, which is connected to the driver to provide working power for the driver.

[0025] Furthermore, the grating position sensor and the grating ruler are both located below the bond head body, and the grating position sensor and the grating ruler are both located between the connecting bracket and the base.

[0026] Compared with the prior art, the wire welding machine head leaf spring bearing consistency detection method and detection system of the present invention obtains the rigidity coefficient K and free state value b of the leaf spring bearing by fitting the data obtained through consistency test measurement. The rigidity coefficient K and the free state value b are controlled to meet the standard of mechanical design parameters, thereby realizing the consistency detection of leaf spring bearings, effectively screening out non-standard leaf spring bearings with consistent performance, eliminating unqualified leaf spring bearings with large differences, and improving welding accuracy and product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but should not constitute a limitation of the present invention.

[0028] Figure 1 : Schematic diagram of the wire welding machine bond head leaf spring bearing consistency detection system of the present invention;

[0029] Figure 2 : A three-dimensional diagram of the bungee mechanism of the present invention;

[0030] Figure 3 : Another stereoscopic view of the bungee mechanism of the present invention;

[0031] Figure 4 : Schematic diagram of the movement points of the bonding mechanism in the consistency test of the bonding leaf spring bearing of the wire welding machine of the present invention;

[0032] Figure 5 : A flow chart of the steps of detecting the consistency of the leaf spring bearing of the wire welding machine of the present invention. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0034] like Figures 1 to 3 As shown, the wire welding machine bunging leaf spring bearing consistency detection system of the present invention comprises: a bunging mechanism, a driver, a power module and a computer; wherein the bunging mechanism is connected to the driver and the computer, and the bunging mechanism is driven to move by the driver. The computer is installed with a host computer software, and the host computer software detects and records the movement of the bunging mechanism; the power module is connected to the driver to provide working power for the driver.

[0035] The bang head mechanism includes a base 1 and a bang head body 2; wherein the base 1 is provided with a connecting bracket 3, and the bang head body 2 is installed on the connecting bracket 3 through a leaf spring bearing 4, thereby realizing the mechanical connection between the bang head body 2 and the base 1. The bang head body 2 is connected to a voice coil motor 5, and the voice coil motor 5 drives the bang head body 2 to swing up and down with the leaf spring bearing 4 as the swing fulcrum.

[0036] The bottom of the connecting bracket 3 is equipped with a grating position sensor 6 and a grating ruler 7, both of which are located below the main body 2 of the bond head, and both of which are located between the connecting bracket 3 and the base 1. The grating position sensor 6 is connected to a computer to read the scale of the grating ruler 7.

[0037] The driver controls the current output to the voice coil motor 5 to drive the main body 2 of the bang head to swing up and down with the leaf spring bearing 4 as the swing fulcrum; the grating position sensor 6 reads the scale information of the grating ruler 7 and then feeds it back to the computer, thereby obtaining the position information of the movement of the main body 2 of the bang head. Preferably, when the main body 2 of the bang head moves to the specified position, the reaction force of the leaf spring bearing 4 is equivalent to the output current of the driver at this time.

[0038] like Figure 4 and Figure 5 As shown, the present invention also provides a method for detecting the consistency of a bearing of a leaf spring of a wire welding machine, comprising the following steps:

[0039] Hovering position detection (C0): Install the leaf spring bearing 4, the driver does not output current, read the position information fed back by the grating position sensor 6 at this time, and fine-tune the leaf spring bearing 4 according to the position information fed back by the grating position sensor 6 to make the bun head body 2 in a horizontal position.

[0040] In this step, the difference between the measured hovering position (C0) between the machines and the mechanically designed hovering position cannot exceed the error detection threshold (e.g., 10%).

[0041] Limit test: Increase the current output of the driver to make the voice coil motor 5 drive the main body 2 of the bang head to move to the positive limit position (X Positive Limit ), record the current output of the driver at this time as the data required for consistency judgment fitting; reduce the current output of the driver, so that the voice coil motor 5 drives the main body 2 of the bang head to move to the negative limit position (X Negative Limit ), record the current output of the driver at this time as the data required for consistency judgment fitting; in this process, ensure that the current output values ​​at the positive limit and the negative limit are within the design range of the driver working current.

[0042] Travel position test of equal points (X n / 8 ): According to the position information of the positive limit position and the negative limit position fed back by the grating position sensor 6, the total movement stroke of the bang head body 2 is divided into eight sections, including seven equally divided points; the current output of the driver is changed so that the voice coil motor 5 drives the bang head body 2 to move to each equally divided point accordingly (X n / 8 , n is 1-7), record the current output of each point at this time, as the data required for consistency judgment fitting. In one embodiment, C0 and X 4 / 8 The test point is the same point.

[0043] Data fitting: The position information fed back by the grating position sensor 6 and the current output data of the driver recorded in the above steps are linearly fitted by a computer using a least squares fitting algorithm with partial spatial constraints:

[0044] Among them, X is the position information, and Y is the current output;

[0045] According to the mechanical elasticity theory of the spring, the rigidity coefficient K is determined by the material properties of the leaf spring bearing 4, and b reflects the free state of the leaf spring bearing 4.

[0046] Judgment on meeting consistency requirements: Taking the design range of the stiffness coefficient of the leaf spring bearing 4 as the fitting constraint condition, the stiffness coefficient K (i.e., elastic coefficient) of the leaf spring bearing 4 is obtained. According to the two fitting coefficients K and b, which must meet the design requirements (consistency quantitative indicators and mechanical design indicators) of the mechanical design parameters within the range of ±3σ (σ is the standard deviation of the normal distribution of the force constant), each leaf spring bearing 4 is tested to see whether it meets the consistency requirements.

[0047] In summary, the wire welding machine header leaf spring bearing 4 consistency detection method and detection system of the present invention firstly controls the mechanical installation hovering position (C0) between the machines, and then performs data fitting on the data obtained through consistency test measurement to obtain the rigidity coefficient K and the hovering position (free state) b of the leaf spring bearing 4. By controlling K and b to meet the ±3σ range standard of the mechanical design parameters, consistency detection of the leaf spring bearing 4 is achieved, and non-standard leaf spring bearings 4 with consistent performance are effectively screened out, and unqualified leaf spring bearings 4 with large differences are eliminated, thereby improving welding accuracy and product qualification rate.

[0048] As long as it does not violate the creative ideas of the present invention, any combination of the various embodiments of the present invention shall be regarded as the contents disclosed by the present invention; within the technical concept of the present invention, any combination of various simple modifications of the technical scheme and different embodiments that does not violate the creative ideas of the present invention shall be within the protection scope of the present invention.

Claims

1. A method for detecting the consistency of a leaf spring bearing of a wire welding machine, characterized in that: The detection is performed by using a wire welding machine bunging leaf spring bearing consistency detection system, wherein the wire welding machine bunging leaf spring bearing consistency detection system includes a bunging mechanism, a driver and a computer; The binding head mechanism is connected to the driver and the computer, and the driver drives the binding head mechanism to move; the computer is installed with the host computer software, and the host computer software detects and records the movement of the binding head mechanism; The bang head mechanism comprises a base (1) and a bang head body (2); the base (1) is provided with a connecting bracket (3); the bang head body (2) is mounted on the connecting bracket (3) via a leaf spring bearing (4); the bang head body (2) is connected to a voice coil motor (5); the voice coil motor (5) drives the bang head body (2) to swing up and down with the leaf spring bearing (4) as a swing fulcrum; A grating position sensor (6) and a grating ruler (7) are installed at the bottom of the connecting bracket (3), and the grating position sensor (6) is connected to a computer to read the scale of the grating ruler (7); The following steps are involved: Hovering position detection: Install the leaf spring bearing (4), the driver does not output current, read the position information fed back by the grating position sensor (6) at this time, and fine-tune the leaf spring bearing (4) according to the position information fed back by the grating position sensor (6) so that the main body (2) of the bunker is in a horizontal position; Limit test: increasing the current output of the driver so that the voice coil motor (5) drives the main body (2) of the poppet to move to the positive limit position, and recording the current output of the driver at this time; decreasing the current output of the driver so that the voice coil motor (5) drives the main body (2) of the poppet to move to the negative limit position, and recording the current output of the driver at this time; Test of travel position at equally divided points: according to the position information of the positive limit position and the negative limit position fed back by the grating position sensor (6), the total travel of the movement of the bang head body (2) is equally divided; the current output of the driver is changed so that the voice coil motor (5) drives the bang head body (2) to move to each equally divided point position accordingly, and the current output of the driver at each point at this time is recorded; Data fitting: Linear fitting is performed on the position information fed back by the grating position sensor (6) in the hovering position detection, the position information of the positive limit position and the position information of the negative limit position fed back by the grating position sensor (6) in the stroke position test of the equally divided points, the current output of the positive limit position driver in the limit test, the current output of the negative limit position driver, and the current output data of the driver at each point in the stroke position test of the equally divided points through a computer: Y=KX+b Among them, X is the position information, and Y is the current output; Judgment on whether consistency requirements are met: using the stiffness coefficient design range of the leaf spring bearing (4) as a fitting constraint condition, two fitting data, namely the stiffness coefficient K of the leaf spring bearing (4) and the free state value b of the leaf spring bearing (4), are obtained. Based on the requirement that the two fitting data must meet consistency quantitative indicators and mechanical design indicators, each leaf spring bearing (4) is tested to see whether it meets the consistency requirements.

2. The method for detecting the consistency of the bearing of the leaf spring of the wire welding machine as claimed in claim 1, characterized in that: During the hovering position detection, the difference between the measured hovering position of the machine and the mechanical designed hovering position shall not exceed the error detection threshold of 10%.

3. The method for detecting the consistency of the bearing of the wire welding machine bond head leaf spring according to claim 1, characterized in that: In data fitting, a least squares fitting algorithm with partial spatial constraints is used by computer to perform linear fitting.

4. The method for detecting the consistency of the bearing of the leaf spring of the wire welding machine as claimed in claim 1, characterized in that: During the limit test, ensure that the current output values ​​at the positive limit and the negative limit are within the design range of the driver operating current.

5. The method for detecting the consistency of the bearing of the leaf spring of the wire welding machine as claimed in claim 1, characterized in that: In the stroke position test of the equally divided points, the total stroke of the main body (2) of the ram is equally divided into eight sections, including seven equally divided points.

6. The method for detecting the consistency of the bearing of the leaf spring of the wire welding machine as claimed in claim 1, characterized in that: In the judgment of meeting the consistency requirements, the requirements for consistency quantitative indicators and mechanical design indicators are within the ±3σ range of mechanical design parameters, and σ is the standard deviation of the normal distribution of the force constant.

7. A wire welding machine bungee leaf spring bearing consistency detection system, characterized in that: The detection is performed using the wire welding machine bond head leaf spring bearing consistency detection method described in any one of claims 1 to 6, and also includes a power module, which is connected to the driver to provide working power for the driver.

8. The wire welding machine bond head leaf spring bearing consistency detection system as claimed in claim 7, characterized in that: The grating position sensor (6) and the grating ruler (7) are both located below the bond head body (2), and the grating position sensor (6) and the grating ruler (7) are both located between the connecting bracket (3) and the base (1).

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