Press fitting method based on visual compensation

Abstract

The invention discloses a press fitting method based on visual compensation. The press fitting method comprises the steps that whether the height from a terminal to a circuit board is qualified or not is detected through a camera; calculating a height compensation value according to the height from the terminal to the circuit board; and performing press fitting on the terminal and the circuit board according to the height compensation value. According to the press-fitting method based on visual compensation, the height from the terminal to the circuit board is detected through the camera, height compensation is calculated, it is guaranteed that the boss position of the terminal is completely pressed into the printed circuit board, press-fitting errors are reduced, the press-fitting effect is guaranteed, and the rejection rate is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of terminal press-fitting, and in particular relates to a press-fitting method based on visual compensation. Background Art

[0002] Pressfit technology mainly achieves reliable connection through cold connection without soldering. During the connection process, the terminal such as fisheye pin is pressed into the hole of the matching printed circuit board, and the elastic deformation generated during the pressing process is used to obtain a higher clamping force, thereby forming a tight connection. This connection method makes the macro contact force concentrated on the micro contact area, the contact radius increases, the effective contact area increases, and an airtight connection is formed in the contact area, which has good electrical and mechanical connection performance.

[0003] In the prior art, the press-fitting process relies on the consistency of the incoming terminal materials. However, there are differences between the terminals and the holes in the printed circuit board, making it difficult to ensure that the bosses of the terminals are completely pressed into the printed circuit board, resulting in electrical performance failure or poor durability. At the same time, due to the different matching heights of different terminals and printed circuit boards, large errors are easily generated when multiple terminals are press-fitted at the same time, making it impossible to guarantee the press-fitting effect. Summary of the invention

[0004] The purpose of the present invention is to propose a press-fitting method based on visual compensation to solve the problem in the prior art that it is difficult to ensure that the boss position of the terminal is completely pressed into the printed circuit board, and large errors are easily generated when multiple terminals are press-fitted at the same time, thereby failing to ensure the press-fitting effect.

[0005] To this end, the present invention provides a press-fitting method based on visual compensation, comprising the following steps:

[0006] Use a camera to check whether the height from the terminal to the circuit board is qualified;

[0007] Calculate the height compensation value based on the height from the terminal to the circuit board;

[0008] The terminals are press-fitted onto the circuit board according to the height compensation value.

[0009] Preferably, the detecting whether the height from the terminal to the circuit board is qualified by using a camera comprises:

[0010] Select several terminals through the camera;

[0011] Detect the height from the terminal to the circuit board to determine whether it is qualified;

[0012] Calculate the average height of the selected terminals to the circuit board to determine whether it is qualified.

[0013] Preferably, among the several terminals selected by the camera, the selected terminals are terminals at the center and four corner points.

[0014] Preferably, the height of the detection terminal to the circuit board and judging whether it is qualified include:

[0015] Determine whether the height from a single terminal to the circuit board is within the tolerance range;

[0016] Determine whether the difference between the maximum and minimum values ​​of the height from the selected terminal to the circuit board is within the tolerance range.

[0017] Preferably, calculating the average value of the heights from the selected terminals to the circuit board to determine whether they are qualified includes:

[0018] Determine whether the average value of the selected terminal to circuit board height is within the tolerance range.

[0019] Preferably, the calculating the height compensation according to the height from the terminal to the circuit board comprises:

[0020] Calculate the difference between the height from the terminal to the circuit board and the standard value, and use the difference between the height from the terminal to the circuit board and the standard value as the height compensation value.

[0021] Preferably, press-fitting the terminal to the circuit board according to the height compensation value includes:

[0022] The pressure applied to the terminal is adjusted according to the height compensation value, and the terminal is pressed into the hole of the circuit board.

[0023] Preferably, before the camera is used to detect whether the height of the terminal from the circuit board is qualified, the terminal is also pre-pressed through a hole on the circuit board.

[0024] Preferably, the pre-pressing of the terminal through the hole on the circuit board comprises:

[0025] Detect the position of the terminal by camera;

[0026] Detect the position of the holes on the circuit board by using a camera;

[0027] Push the terminals through the holes in the circuit board.

[0028] Preferably, after the terminals are press-fitted onto the circuit board according to the height compensation value, the method further includes randomly selecting a number of terminals through a camera to detect the heights of the terminals.

[0029] Beneficial effects:

[0030] 1. The present invention provides a press-fitting method based on visual compensation, which detects the height from the terminal to the circuit board through a camera and calculates the height compensation to ensure that the boss position of the terminal is completely pressed into the printed circuit board, reduce the press-fitting error, thereby ensuring the press-fitting effect and reducing the scrap rate.

[0031] 2. The present invention takes the center and four corner points of the terminal as a reference to determine whether the height of a single terminal to the circuit board is within the tolerance range; and whether the difference between the maximum and minimum values ​​of the height of the selected terminal to the circuit board is within the tolerance range, and determines whether the difference between the maximum and minimum values ​​of the height of the selected terminal to the circuit board is within the tolerance range, thereby ensuring that the overall terminal height is qualified and providing a basis for subsequent height supplementation.

[0032] 3. The present invention calculates the difference between the height from the terminal to the circuit board and the standard value, and uses the difference between the height from the terminal to the circuit board and the standard value as the height compensation value, thereby ensuring that the boss position of the terminal is completely pressed into the printed circuit board and reducing the press-fitting error. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 these drawings without paying creative work.

[0034] Figure 1 The figure is a flow chart of a method of press-fitting based on visual compensation in the present invention.

[0035] Figure 2 It is a schematic diagram of the press-fitting structure of a press-fitting method based on visual compensation in the present invention.

[0036] Figure 3 It is a structural schematic diagram of pre-pressing of a press-fitting method based on visual compensation in the present invention.

[0037] In the figure: 1-circuit board, 11-hole, 2-terminal, 21-bump. DETAILED DESCRIPTION

[0038] The content of the present invention can be more easily understood by selecting the following detailed description of the preferred implementation method of the present invention and the embodiments included. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0039] Embodiment 1:

[0040] like Figure 2 As shown, there are several holes 11 on the circuit board 1, and the terminal 2 is a fisheye pin, that is, a protrusion 21 is provided on the pin of the terminal 2, and the protrusion 21 is interference fit with the hole on the circuit board 1. The purpose of press-fitting is to press the protrusion 21 of the terminal 2 into the hole 11 on the circuit board 1. After press-fitting, it is necessary to ensure that the height from the terminal 2 to the circuit board 1 is within the tolerance range.

[0041] For this reason, Figure 1 As shown, this embodiment provides a press-fitting method based on visual compensation, comprising the following steps:

[0042] S1. Pre-press the terminals through the holes on the circuit board.

[0043] The steps include:

[0044] S11, detecting the position of the terminal by a camera;

[0045] In one embodiment, the camera is a 3D camera, which can convert the captured image of the terminal into three-dimensional coordinates, thereby detecting the position of the terminal.

[0046] S12, detecting the position of the hole on the circuit board by using a camera;

[0047] In one embodiment, the camera converts the captured image of the circuit board into three-dimensional coordinates to detect the location of the holes on the circuit board.

[0048] S13. Pass the terminals through the holes in the circuit board.

[0049] Move the terminal according to the position of the terminal and the position of the hole on the circuit board to pass the terminal through the circuit board until the protrusion of the terminal is attached to the circuit board and the needle tip of the terminal is higher than the circuit board.

[0050] S2. Use a camera to detect whether the height from the terminal to the circuit board is qualified;

[0051] The steps include:

[0052] S21, selecting a number of terminals through a camera;

[0053] In one embodiment, the selected terminals are the terminals at the center and four corners. The terminals at the center and four corners are used as a reference to reflect the height of the entire terminal and ensure the press-fitting effect of the terminal.

[0054] S22, detecting the height from the terminal to the circuit board to determine whether it is qualified;

[0055] Among them, Figure 3 As shown, the height H from the terminal to the circuit board is the vertical distance from the needle tip of the terminal to the circuit board.

[0056] For the selected 5 terminals, determine whether the height from each terminal to the circuit board is within the tolerance range. If so, proceed to S23. If not, stop and report an error.

[0057] For the selected 5 terminals, determine whether the difference between the maximum and minimum values ​​of the heights of the selected terminals to the circuit board is within the tolerance range. If it is within the tolerance range, continue to S23. If it exceeds the tolerance range, stop and report an error.

[0058] S23. Calculate the average height of the selected terminal to the circuit board to determine whether it is qualified.

[0059] The average terminal-to-board height is

[0060]

[0061] Among them, H D is the average height from the terminal to the circuit board, H i The height of each of the five terminals to the circuit board.

[0062] For the average value of the height from the terminal to the circuit board, determine whether the average value of the height from the selected terminal to the circuit board is within the tolerance range. If it is within the tolerance range, continue to S3. If it exceeds the tolerance range, stop and report an error.

[0063] S3, calculating the height compensation value according to the height from the terminal to the circuit board;

[0064] Calculate the difference between the height from the terminal to the circuit board and the standard value, and use the difference between the height from the terminal to the circuit board and the standard value as the height compensation value.

[0065] S4, press-fitting the terminal and the circuit board according to the height compensation value;

[0066] The pressure applied to the terminal is adjusted according to the height compensation value, and the terminal is pressed into the hole of the circuit board.

[0067] S5. Randomly select a number of terminals through a camera and detect the height of the terminals.

[0068] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A press-fitting method based on visual compensation, characterized in that: The steps include: Use a camera to check whether the height from the terminal to the circuit board is qualified; Calculate the height compensation value based on the height from the terminal to the circuit board; The terminals are press-fitted onto the circuit board according to the height compensation value.

2. A press-fitting method based on visual compensation according to claim 1, characterized in that: The method of detecting whether the height from the terminal to the circuit board is qualified by using a camera includes: Select several terminals through the camera; Detect the height from the terminal to the circuit board to determine whether it is qualified; Calculate the average height of the selected terminals to the circuit board to determine whether it is qualified.

3. A press-fitting method based on visual compensation according to claim 2, characterized in that: The terminals selected by the camera are the terminals at the center and four corner points.

4. A press-fitting method based on visual compensation according to claim 1, characterized in that: The height between the detection terminal and the circuit board is determined to be qualified, including: Determine whether the height from a single terminal to the circuit board is within the tolerance range; Determine whether the difference between the maximum and minimum values ​​of the height from the selected terminal to the circuit board is within the tolerance range.

5. A press-fitting method based on visual compensation according to claim 4, characterized in that: Calculate the average height of the selected terminal to the circuit board to determine whether it is qualified, including: Determine whether the average value of the selected terminal to circuit board height is within the tolerance range.

6. A press-fitting method based on visual compensation according to claim 4, characterized in that: Calculating the height compensation according to the height from the terminal to the circuit board includes: Calculate the difference between the height from the terminal to the circuit board and the standard value, and use the difference between the height from the terminal to the circuit board and the standard value as the height compensation value.

7. The press-fitting method based on visual compensation according to claim 1, characterized in that: Press-fitting the terminal to the circuit board according to the height compensation value includes: The pressure applied to the terminal is adjusted according to the height compensation value, and the terminal is pressed into the hole of the circuit board.

8. The press-fitting method based on visual compensation according to claim 1, characterized in that: Before the camera is used to detect whether the height of the terminal to the circuit board is qualified, the terminal is passed through the hole on the circuit board to achieve pre-pressing.

9. A press-fitting method based on visual compensation according to claim 8, characterized in that: The pre-pressing of the terminal through the hole on the circuit board comprises: Detect the position of the terminal by camera; Detect the position of the holes on the circuit board by using a camera; Push the terminals through the holes in the circuit board.

10. The press-fitting method based on visual compensation according to claim 1, characterized in that: After the terminals are press-fitted onto the circuit board according to the height compensation value, the method further includes randomly selecting a number of terminals through a camera to detect the heights of the terminals.

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