Short slot processing method and device and printed circuit board

Abstract

The invention discloses a short slot processing method, a short slot processing device and a printed circuit board. The short slotted hole machining method comprises the steps that the actual tool diameter and the theoretical tool diameter of a drilling tool are obtained, and the target length and the target depth of a short slotted hole to be drilled are obtained; compensating the target length of the short slotted hole to be drilled according to the actual cutter diameter and the theoretical cutter diameter; a first drilling position and a second drilling position are arranged at the two ends of the to-be-drilled short slotted hole in the length direction respectively, the first drilling position is tangent to the edge of the first end of the to-be-drilled short slotted hole in the length direction, and the second drilling position is tangent to the edge of the second end of the to-be-drilled short slotted hole in the length direction; and the drilling tool is controlled to alternately conduct multiple times of drilling in the first drilling position and the second drilling position till the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are the target depth. The problems of deformation and short slot length of the short slot can be effectively avoided, and the machining precision of the short slot is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of printed circuit board, and particularly relates to a short slot hole processing method and device and a printed circuit board. BACKGROUND

[0002] With the development of electronic technology, printed circuit boards (PCB) are developing towards high board thickness, high density and multi-function, and the demand and quantity of short slot holes in the printed circuit board are increasing, and the processing quality requirement of the short slot hole is also increasing.

[0003] However, the traditional short slot hole processing has conventional control such as slot end guide hole and slot hole rotation compensation, and complex calculation is required for the size, position, rotation direction and angle of the guide hole according to different product design and short slot hole size. The complexity is high in the actual operation process, and the high-precision size control and distortion problem of the short slot hole cannot be effectively solved, so that the processing precision of the short slot hole is difficult to improve. SUMMARY

[0004] The present application provides a short slot hole processing method and device and a printed circuit board to accurately compensate for the short slot hole and improve the processing precision of the short slot hole.

[0005] In a first aspect, the embodiment of the present application provides a short slot hole processing method, which comprises:

[0006] The actual bit diameter and the theoretical bit diameter of a drill bit are obtained, and the target length and the target depth of a to-be-drilled short slot hole are obtained;

[0007] The target length of the to-be-drilled short slot hole is compensated according to the actual bit diameter and the theoretical bit diameter;

[0008] A first drilling position and a second drilling position are respectively arranged at two ends of the length direction of the to-be-drilled short slot hole; wherein the first drilling position is tangent to the first end edge of the length direction of the to-be-drilled short slot hole, the second drilling position is tangent to the second end edge of the length direction of the to-be-drilled short slot hole, and the first end and the second end of the to-be-drilled short slot hole are opposite to each other;

[0009] The drill bit is controlled to alternately drill at the first drilling position and the second drilling position for multiple times until the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are both the target depth.

[0010] Optionally, the control of the drill bit to alternately drill at the first drilling position and the second drilling position until the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are both the target depth comprises:

[0011] controlling the drill bit to alternately drill multiple times at the first drilling position and the second drilling position, each time the drill bit drills a depth that increases by a preset drilling depth, until the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are both the target depth; wherein the drill bit drills n times at the first drilling position and m times at the second drilling position, n>1, m>1, and n and m are both integers.

[0012] Optionally, the control of the drill bit to alternately drill multiple times at the first drilling position and the second drilling position comprises:

[0013] controlling the drill bit to drill once at the first drilling position;

[0014] controlling the drill bit to alternately drill multiple times at the second drilling position and the first drilling position; wherein the primary drilling operation is an operation of the drill bit drilling once at the corresponding hole position, and the secondary drilling operation is an operation of the drill bit drilling at least twice at the corresponding hole position, and the depth of each drilling is the same.

[0015] Optionally, the control of the drill bit to alternately drill multiple times at the first drilling position and the second drilling position, each time the drill bit drills a depth that increases by a preset drilling depth, until the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are both the target depth, comprises:

[0016] controlling the drill bit to alternately drill multiple times at the first drilling position and the second drilling position until the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are both the target depth, and the drilling depth of the drill bit after each alternation is satisfied:

[0017] ;

[0018] wherein A is the drilling depth after each alternation, a is the preset drilling depth, b is the initial depth of the drill bit drilling at the first drilling position for the first time, and i is the number of alternations.

[0019] Optionally, before the control of the drill bit to alternately drill multiple times at the first drilling position and the second drilling position, the method further comprises:

[0020] determining the preset drilling depth according to the drill bit diameter of the drill bit and a preset drilling depth table; wherein different drill bit diameters in the preset drilling depth table correspond to different preset drilling depths.

[0021] Optionally, after controlling the drill bit to alternately drill multiple times at the first drilling position and the second drilling position until the total drilling depth at the first drilling position and the total drilling depth at the second drilling position are both the target depth, the method further includes:

[0022] Drilling is performed in the area between the first drill position and the second drill position.

[0023] Optionally, the compensation for the target length of the short slot to be drilled based on the actual cutting diameter and the theoretical cutting diameter includes:

[0024] The target length of the short slot to be drilled is compensated based on the actual tool diameter and the theoretical tool diameter to obtain the machining length of the short slot to be drilled. The machining length of the short slot to be drilled satisfies the following:

[0025] L1 = L + (D0 - D1);

[0026] Wherein, L1 is the machining length of the short slot to be drilled, L is the target length of the short slot to be drilled, D0 is the theoretical tool diameter, and D1 is the actual tool diameter.

[0027] The drill bit is a slotting drill bit, and the diameter of the drill bit is the same as the width of the short slot to be drilled.

[0028] Secondly, embodiments of the present invention also provide a short slot hole machining apparatus, which is used to perform the short slot hole machining method in any embodiment of the present invention. The short slot hole machining apparatus includes a control module and a drill bit, and the control module and the drill bit are connected.

[0029] The control module is used to obtain the actual and theoretical diameter of the drill bit, and to obtain the target length and target depth of the short slot to be drilled;

[0030] The control module is also used to compensate for the target length of the short slot to be drilled based on the actual tool diameter and the theoretical tool diameter, so as to obtain the machining length of the short slot to be drilled.

[0031] The control module is also used to set a first drilling position and a second drilling position at both ends of the short slot to be drilled along its length; wherein the first drilling position is tangent to the first end edge of the short slot to be drilled along its length, and the second drilling position is tangent to the second end edge of the short slot to be drilled along its length, and the first end and the second end of the short slot to be drilled are opposite to each other.

[0032] The control module is also used to control the drill bit to alternately drill multiple times at the first drilling position and the second drilling position until the total drilling depth at the first drilling position and the total drilling depth at the second drilling position are both the target depth.

[0033] Thirdly, embodiments of the present invention also provide a printed circuit board, wherein the printed circuit board is provided with short slots, and the short slots are formed by the short slot processing device described in the embodiments of the present invention.

[0034] This invention provides a method, apparatus, and printed circuit board for processing short slots. The method includes: obtaining the actual and theoretical diameters of a drill bit, and obtaining the target length and target depth of the short slot to be drilled; compensating for the target length of the short slot based on the actual and theoretical diameters, thereby performing slot length compensation so that the final processed short slot length is equal to the target length of the short slot to be drilled. A first drilling position and a second drilling position are respectively set at both ends of the length direction of the short slot to be drilled. The first drilling position is tangent to the first edge of the short slot in the length direction, and the second drilling position is tangent to the second edge of the short slot in the length direction. The drill bit is controlled to alternately drill multiple times at the first and second drilling positions until the total drilling depth at the first and second drilling positions is the target depth. This corrects for slot shape offset and deformation during the slot processing, ensuring that the final processed short slot has a regular slot shape. This invention can provide precise compensation for short slots, improve the machining accuracy of short slots, effectively solve the problem of slot shape changes during slot machining, improve slot machining quality, and increase product yield. Attached Figure Description

[0035] Figure 1 A flowchart of a short slot hole machining method provided in an embodiment of the present invention;

[0036] Figure 2 A flowchart of another short slot hole processing method provided in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram showing the process before and after slot length compensation, as provided in an embodiment of the present invention.

[0038] Figure 4 This is a cross-sectional schematic diagram of a short slot hole before drilling, provided in an embodiment of the present invention;

[0039] Figure 5 This is a cross-sectional schematic diagram of the short slot hole machining process provided in an embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram showing residual material during the short slot hole machining process provided in an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of a short slot hole processing device provided in an embodiment of the present invention. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0043] This invention provides a method for processing short slots, which can be used to process short slots in PCBs to improve the processing accuracy of short slots, effectively solve the problem of slot shape change during slot processing, improve slot processing quality, and increase product yield. Figure 1 A flowchart of a short slot hole machining method provided in an embodiment of the present invention is shown below. Figure 1 As shown, the short slot hole machining method includes:

[0044] S110. Obtain the actual and theoretical diameter of the drill bit, and obtain the target length and target depth of the short slot to be drilled.

[0045] The theoretical diameter of a drill bit is its designed diameter. As the drill bit is used more, its diameter changes due to wear. The actual diameter of the drill bit is its current diameter. If the theoretical diameter is used directly for machining, and the actual diameter has decreased due to wear, the machined size will be smaller than expected. Therefore, before machining short slots, it is necessary to obtain both the actual and theoretical diameters of the drill bit for comparison.

[0046] S120. Compensate for the target length of the short slot to be drilled based on the actual and theoretical cutting tool diameters.

[0047] Specifically, since the drilling equipment still uses the theoretical tool diameter, if the actual tool diameter is smaller than the theoretical diameter, the machined size will be smaller. To avoid the short slot hole becoming too short, slot length compensation is needed to compensate for the target length of the short slot hole to be drilled, ensuring that the final machined short slot hole length equals the target length. For example, when the actual tool diameter is smaller than the theoretical tool diameter, positive compensation is applied to the target length of the short slot hole to be drilled, so the machined short slot hole length still equals the target length during actual drilling. When the actual tool diameter is larger than the theoretical tool diameter, negative compensation is applied to the target length of the short slot hole to be drilled, so the machined short slot hole length still equals the target length during actual drilling. When the actual tool diameter equals the theoretical tool diameter, no adjustment to the target length of the short slot hole is needed. By performing slot length compensation based on the actual tool diameter before drilling, the dimensional accuracy of the short slot hole is guaranteed, improving the dimensional tolerance capability of the short slot hole machining.

[0048] S130. A first drilling position and a second drilling position are respectively set at both ends of the short slot to be drilled along its length direction; wherein, the first drilling position is tangent to the first end edge of the short slot to be drilled along its length direction, and the second drilling position is tangent to the second end edge of the short slot to be drilled along its length direction, and the first end and the second end of the short slot to be drilled are opposite to each other.

[0049] Specifically, a first drilling position and a second drilling position are respectively set at both ends of the short slot to be drilled along its length. The first drilling position is tangent to the first edge of the short slot along its length, and the second drilling position is tangent to the second edge of the short slot along its length. The first end and the second end of the short slot are opposite to each other, so that the drill bit drills at the first drilling position and the second drilling position respectively. For example, the first drilling position and the second drilling position are circular, and the diameters of the first drilling position and the second drilling position are both theoretical tool diameter values. The first drilling position is tangent to the first side of the short slot to be drilled, and the second drilling position is tangent to the second side of the short slot to be drilled. The first side and the second side of the short slot to be drilled are opposite to each other.

[0050] S140. Control the drill bit to alternately drill multiple times at the first drilling position and the second drilling position until the total drilling depth at the first drilling position and the total drilling depth at the second drilling position are both the target depth.

[0051] In related technologies for machining short slots, the drilling process involves first cutting to the target depth at the left end of the slot, then at the right end, and finally at the middle. However, when drilling to the right end, the drill bit experiences uneven force due to the material already removed during the left-end drilling. This uneven force causes lateral cutting, resulting in slot tilting and a shorter slot length. Since the drill bit's cutting edge (generally a double-edged drill bit) contacts the board surface at different positions (randomly during rotation), the lateral force on the drill bit varies, leading to different tilt angles and slot lengths. Therefore, a fixed value for rotational and length compensation cannot improve slot accuracy.

[0052] This invention reduces the drilling stroke, changing the previous method of drilling to the target depth in one pass to multiple passes to the target depth, with the two holes being drilled alternately. Specifically, the drill bit is controlled to alternately drill multiple times at the first and second drilling positions until the total drilling depth at the first and second drilling positions are both the target depth, thus achieving the processing of short slot holes.

[0053] Furthermore, through multiple tests, this invention has shown that for drills with smaller diameters, the offset caused by lateral deviation is greater when using the single-drilling method in related technologies. This is more pronounced when the drill diameter is smaller than the preset diameter. Therefore, this invention controls the drill to alternately drill multiple times at the first and second drilling positions until the total drilling depth at the first and second drilling positions are both the target depth. By using small feed rates in each drilling step, the problem of uneven force on both sides of the drill bit leading to deformation of the short slot is reduced during the drilling process, as the material on one side of the slot has already been drilled away. At the same time, the drilling can be repeated once during the alternating layer drilling process to further correct the slot offset. The final short slot has a regular shape, effectively solving the problem of slot shape change during slot processing, improving slot processing quality, increasing product yield, and avoiding the complex computer settings for guide hole setting and tilt angle compensation during short slot processing.

[0054] This invention provides a method for machining short slots. The method includes: obtaining the actual and theoretical diameter of a drill bit, and obtaining the target length and target depth of the short slot to be drilled; compensating for the target length of the short slot based on the actual and theoretical diameters so that the final machined short slot length equals the target length. A first drilling position and a second drilling position are respectively set at both ends of the length direction of the short slot. The first drilling position is tangent to the first edge of the short slot along its length direction, and the second drilling position is tangent to the second edge of the short slot along its length direction. The drill bit is controlled to alternately drill multiple times at the first and second drilling positions until the total drilling depth at both positions is the target depth. This corrects for slot shape offset and deformation during the slot machining process, ensuring a regular slot shape in the final machined short slot. It also allows for precise compensation of the short slot, improving machining accuracy, effectively solving the problem of slot shape changes during slot machining, improving machining quality, and increasing product yield.

[0055] This invention provides another method for machining short slots, which further improves the machining accuracy of short slots, effectively solves the problem of slot shape change during slot machining, improves slot machining quality, and increases product yield. Figure 2 A flowchart of another short slot hole machining method provided in an embodiment of the present invention is shown below. Figure 2 As shown, the short slot hole machining method includes:

[0056] S210. Obtain the actual and theoretical diameter of the drill bit, and obtain the target length and target depth of the short slot to be drilled.

[0057] S220. Compensate for the target length of the short slot to be drilled based on the actual and theoretical cutting tool diameters.

[0058] Specifically, traditional short slot hole machining involves conventional controls such as adding pilot holes at the slot end and slot rotation compensation. However, the length tolerance of the machined slot remains relatively large. After multiple re-grinding of the machining tool, the tool diameter decreases (up to 20 micrometers), ultimately resulting in a short slot length tolerance of + / -4 mil. Furthermore, slot offset and hole shape deformation during machining further exacerbate the slot length deviation, making it difficult to further improve the machining progress. Moreover, the machining progress requirements for short slots are becoming increasingly stringent, with dimensional tolerances required to be + / -3 mil or even smaller at + / -2 mil, which current machining technology struggles to overcome. In this embodiment of the invention, a drill bit with a diameter equal to the width of the short slot can be selected for drilling. By using a tool measuring instrument in the drilling equipment to measure the actual diameter of the drill bit, slot length compensation is performed based on the deviation between the actual and theoretical diameters, resulting in precise compensation for the short slot dimensions and achieving high-precision short slot hole dimensions.

[0059] Optionally, compensation can be made based on the actual and theoretical tool diameters to determine the target length of the short slot to be drilled, including:

[0060] The target length of the short slot to be drilled is compensated based on the actual tool diameter and the theoretical tool diameter to obtain the machining length of the short slot. The machining length of the short slot satisfies the following:

[0061] L1 = L + (D0 - D1);

[0062] Where L1 is the machining length of the short slot to be drilled, L is the target length of the short slot to be drilled, D0 is the theoretical tool diameter, and D1 is the actual tool diameter.

[0063] Specifically, Figure 3 This is a schematic diagram showing the process before and after slot length compensation, as provided in an embodiment of the present invention. Figure 3As shown, when forming a short slot, an initial first drilling position a and an initial second drilling position b are marked on the short slot to be drilled, and the length of the short slot to be drilled is equal to the target length L of the short slot to be drilled. After compensating for the slot length based on the deviation between the actual tool diameter D1 and the theoretical tool diameter D0, the machining length of the short slot to be drilled satisfies: L1 = L + (D0 - D1). Based on the machining length of the short slot to be drilled, the drilling equipment automatically adjusts the drilling position coordinates of the short slot: the initial first drilling position a and the initial second drilling position b, so that the length of the short slot to be drilled is equal to the machining length L1 of the short slot to be drilled, and obtains the first drilling position a1 and the second drilling position b1. Since the actual tool diameter D1 of the drill bit is less than the theoretical tool diameter D0, the length of the short slot formed after drilling is still the target length L of the short slot to be drilled. This ensures that even when the actual tool diameter D1 is less than the theoretical tool diameter D0, the length of the short slot obtained during actual drilling is still equal to the target length L of the short slot to be drilled. This provides precise compensation for the short slot, improves the machining accuracy of the short slot, and increases the product yield.

[0064] S230. A first drilling position and a second drilling position are respectively set at both ends of the short slot to be drilled along its length direction; wherein, the first drilling position is tangent to the first end edge of the short slot to be drilled along its length direction, and the second drilling position is tangent to the second end edge of the short slot to be drilled along its length direction, and the first end and the second end of the short slot to be drilled are opposite to each other.

[0065] After setting the first drilling position and the second drilling position at both ends of the short slot to be drilled along its length, the method further includes adjusting the machining drill strip of the short slot to be drilled based on the machining length of the short slot to be drilled.

[0066] The drill bit is a slotting drill bit, and its diameter is the same as the width of the short slot to be drilled.

[0067] Specifically, such as Figure 3 As shown, after compensating for the slot length based on the deviation between the actual tool diameter D1 and the theoretical tool diameter D0, the machining length of the short slot to be drilled satisfies: L1 = L + (D0 - D1). Based on the machining length of the short slot, the drilling equipment automatically adjusts the drilling position coordinates of the short slot: the initial coordinates of the first drilling position a and the initial coordinates of the second drilling position b, so that the length of the short slot is equal to the machining length L1, thus obtaining the first drilling position a1 and the second drilling position b1. The edge of the first drilling position a1 is tangent to the first end edge of the short slot along its length direction, and the edge of the second drilling position b1 is tangent to the second end edge of the short slot along its length direction. This ensures that when drilling is performed repeatedly at the first drilling position a1 and the second drilling position b1 in the next step, the length of the resulting short slot remains equal to the target length L of the short slot to be drilled. This precise compensation of the short slot size improves the machining accuracy of the short slot and increases product yield.

[0068] S240. Control the drill bit to alternately drill multiple times at the first drilling position and the second drilling position. The drilling depth of the drill bit increases by the preset drilling depth each time until the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are both the target depth. The drill bit drills n times at the first drilling position and m times at the second drilling position, where n>1, m>1, and n and m are both integers.

[0069] Specifically, in related technologies, the hole to the left of the short slot is drilled first, then the hole to the right of the short slot is drilled directly, and finally a hole is drilled between the two holes. In this embodiment of the invention, the drilling depth of the drill bit is increased by a preset drilling depth each time, and the drill bit is controlled to alternately drill multiple times at the first and second drilling positions until the total drilling depth at the first and second drilling positions are both the target depth.

[0070] Figure 4 This is a cross-sectional schematic diagram of the short slot before drilling, provided in an embodiment of the present invention. Figure 5 This is a cross-sectional schematic diagram of the short slot hole machining process provided in an embodiment of the present invention, as shown below. Figures 4-5 As shown, according to the preset drilling depth N, the first hole A and the second hole B are processed alternately. The first hole A overlaps with the first drilling position a1, and the second hole B overlaps with the second drilling position b1. First, the first hole A is processed at the preset drilling depth N. Then, the drilling depth is increased by the preset drilling depth N to process the first hole B. Then, the drilling depth is increased by the preset drilling depth N again to process the first hole A. Then, the drilling depth is increased by the preset drilling depth N again to process the first hole B, and so on, until the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are both the target depth, thus drilling through the short slot. This embodiment of the invention reduces the problem of deformation of the short slot caused by uneven force on both sides of the drill bit when drilling again during the drilling process due to the removal of part of the plate material. This makes the shape of the short slot obtained in the final processing regular, effectively solving the problem of slot shape change during slot processing, improving slot processing quality, increasing product yield, and avoiding the complex computer settings of guide hole setting and tilt angle compensation during short slot processing.

[0071] S250, Drilling is performed in the area between the first drilling position and the second drilling position.

[0072] Specifically, by drilling in the area between the first and second drilling positions, the area between the first hole A and the second hole B can be drilled through to form a complete short slot.

[0073] In some embodiments of the present invention, controlling the drill bit to alternately perform multiple drilling operations at a first drilling position and a second drilling position includes:

[0074] Control the drill bit to perform one drilling operation at the first drilling position; control the drill bit to alternately perform multiple secondary drilling operations at the second drilling position and the first drilling position; wherein, a single drilling operation is the drill bit performing one drilling operation at the corresponding hole position, and a secondary drilling operation is the drill bit performing at least two drilling operations at the corresponding hole position, and the drilling depth is the same each time.

[0075] Specifically, when the drill bit makes its second cut, since the first drill bit has already removed part of the material to be processed at the second drill bit, the drill bit is subjected to uneven force during processing at the second drill bit, resulting in lateral cutting. The drill bit inevitably deviates laterally, and part of the material at the second drill bit is still not completely removed, causing the slot to tilt and the slot length to become shorter. Figure 6 This is a schematic diagram illustrating the residual material present during the machining process of short slots, as provided in an embodiment of the present invention. Figure 6 As shown, after the first cutter drills at the first drilling position a1, and the second cutter drills at the second drilling position b1, due to uneven displacement of the drill bit during the second cut, residual material X remains unremoved. To further correct the offset during slot processing and ensure the final short slot has a regular shape, this embodiment of the invention first controls the drill bit to perform a single drilling operation at the first drilling position a1. After that, the drill bit is controlled to alternately perform multiple secondary drilling operations at the second drilling position b1 and the first drilling position a1, that is, to repeat the two drilling operations, with the same drilling depth each time, thereby completely removing the residual material X remaining after the first cut.

[0076] In some embodiments of the present invention, the drill bit is controlled to alternately drill multiple times at a first drilling position and a second drilling position, with the drilling depth of the drill bit increasing by a preset drilling depth each time, until the total drilling depth at the first drilling position and the total drilling depth at the second drilling position are both target depths, including:

[0077] The drill bit is controlled to alternately drill multiple times at the first and second drilling positions until the total drilling depth at the first and second drilling positions both reach the target depth. The drilling depth after each drill bit alternation satisfies the following conditions:

[0078] ;

[0079] Where A is the drilling depth after each alternation, a is the preset drilling depth, b is the initial depth of the drill bit when drilling for the first time at the first drilling position, and i is the number of alternations.

[0080] Specifically, the drill bit is controlled to alternately drill multiple times at the first and second drilling positions. The initial depth of the first drilling at the first drilling position is b. Each time the area is changed for drilling, the preset drilling depth a is increased to obtain the drilling depth A after each alternation. Drilling is carried out according to the drilling depth A until the total drilling depth at the first and second drilling positions are both the target depth, thereby realizing the control of the drill bit to alternately drill multiple times at the first and second drilling positions.

[0081] In some embodiments of the present invention, before controlling the drill bit to alternately perform multiple drilling operations at the first drilling position and the second drilling position, the method further includes:

[0082] The preset drilling depth is determined according to the reference table of drill bit diameter and preset drilling depth; where different drill bit diameters correspond to different preset drilling depths in the reference table.

[0083] Specifically, the drill bit diameter can be either the theoretical or actual diameter, which is not limited here. The preset drilling depth reference table can be obtained through multiple experiments. Different drill bit diameters in the preset drilling depth reference table can correspond to different preset drilling depths, that is, different drill bit diameters correspond to different preset drilling depths. Therefore, the preset drilling depth for each drilling depth increase can be determined based on the drill bit diameter and the preset drilling depth reference table, thereby further avoiding changes in the shape of short slots, improving the quality of slot machining, and increasing product yield.

[0084] Taking a theoretical drill bit diameter of 0.40mm, a target length of 0.60mm for the short slot to be drilled, and a target depth of 2.8mm for the plate thickness as an example, the short slot machining method may include: 1) Obtaining the theoretical drill bit diameter of 0.38mm, immediately adjusting the target length of the short slot to be drilled to obtain a compensated length of 0.60 + 0.02mm, and evenly distributing the length at both ends to obtain a preset drilling depth of 0.21mm; 2) Setting a first drilling position and a second drilling position at the ends of the short slot to be drilled; 3) Controlling the drill bit to drill at the first drilling position to a depth of 0.21mm; 4) Controlling the drill bit... 5) Drill to a depth of 0.42mm at the second drilling position, repeat once, for a total of two drills; 6) Drill to a depth of 0.63mm at the second drilling position, repeat once, for a total of two drills; 7) Drill to a depth of 0.84mm at the first drilling position, repeat once, for a total of two drills; 8) Drill to a depth of 1.05mm at the second drilling position, repeat once, for a total of two drills; 9) Drill to a depth of 1.26mm at the first drilling position, repeat once. 10) Control the drill bit to drill in the second drilling position, drill to a depth of 1.47mm, repeat once, drill twice in total; 11) Control the drill bit to drill in the first drilling position, drill to a depth of 1.68mm, repeat once, drill twice in total; 12) Control the drill bit to drill in the second drilling position, drill to a depth of 1.89mm, repeat once, drill twice in total; 13) Control the drill bit to drill in the first drilling position, drill to a depth of 2.00mm, repeat once, drill twice in total; 14) Control the drill bit to drill in the second drilling position, drill to a depth of 2.21mm, repeat once, drill twice in total; 15) Control the drill bit to drill in the first drilling position... 16) Drill to a depth of 2.42mm, repeat once, for a total of two drills; 17) Control the drill bit to drill to a depth of 2.63mm at the second drill position, repeat once, for a total of two drills; 18) Control the drill bit to drill to a depth of 2.8mm at the first drill position, repeat once, for a total of two drills; 19) Drill the area between the first and second drill positions, drill directly through, without layering. Depending on the roughness of the hole wall, multiple stacking drills can be performed until the board material between the first and second drill positions is completely removed.This invention, through prior to drilling, compensates for the groove length based on the measured tool diameter, ensuring the accuracy of the groove length dimensions and improving the dimensional tolerance of short slots. During the drilling process, the invention controls the drill bit to alternately drill multiple times at the first and second drilling positions until the total drilling depth at both positions reaches the target depth. This small feed rate at each step reduces the impact of drilling overlap, minimizing deformation caused by uneven force on the drill bit during subsequent drilling when material on one side of the slot has been removed. Furthermore, the alternating layered drilling process allows for repeated drilling to further correct for slot offset, resulting in a more regular shape for the final short slot. This effectively solves the problem of groove shape changes during slot processing, improves slot quality, increases product yield, and avoids the complex computer settings for guide holes and tilt angle compensation during short slot processing.

[0085] Furthermore, during the drilling process, when the drill bit is subjected to force on one side, mechanical calculations show that the drill bit offset is Δ, and the drill bit offset Δ satisfies:

[0086] ;

[0087] ;

[0088] ;

[0089] Where P is the lateral force on the drill bit, which is related to the amount of material cut on one side; L is the drill bit cutting edge length; d is the effective diameter of the drill bit (because the drill bit cross-section has dust removal grooves, the effective cross-section is smaller than when there is no groove), and it is inversely proportional to the fourth power of the diameter. The larger the drill bit diameter, the larger the lateral force P on the drill bit, which is a square relationship; E is the elastic modulus of the drill strip material, which is related to the material properties. The magnitude of the drill bit offset Δ is related to the lateral force P on the drill bit and the effective diameter d of the drill bit. Furthermore, combining the above formula, it can be seen that the lateral force P on the drill bit is related to the amount of material cut, which can be decomposed into the product of the square of the drill bit diameter and the single drilling stroke L. In this embodiment of the invention, by repeating the drilling once during the alternating layer drilling process, the influence of the drill bit offset Δ is effectively eliminated, effectively solving the problem of groove shape change during groove hole processing, improving groove hole processing quality, and increasing product yield. This invention provides a method for machining short slots. By correcting the slot machining offset, the method ensures that the final machined short slot has a regular shape and provides precise compensation for the short slot, thereby improving the machining accuracy of the short slot, effectively solving the problem of slot shape change during the slot machining process, improving the slot machining quality, and increasing product yield.

[0090] This invention also provides a short slot machining apparatus, which is used to perform the short slot machining method in any embodiment of this invention. Figure 7 This is a schematic diagram of a short slot hole processing device provided in an embodiment of the present invention, as shown below. Figure 7 As shown, the short slot hole machining device includes a control module 110 and a drill bit 120, and the control module 110 and the drill bit 120 are connected.

[0091] The control module 110 is used to obtain the actual and theoretical diameters of the drill bit 120, and to obtain the target length and target depth of the short slot to be drilled. The control module 110 is also used to compensate for the target length of the short slot to be drilled based on the actual and theoretical diameters to obtain the machining length of the short slot to be drilled. The control module 110 is also used to set a first drilling position and a second drilling position at both ends of the short slot to be drilled along its length direction. The first drilling position is tangent to the first end edge of the short slot to be drilled along its length direction, and the second drilling position is tangent to the second end edge of the short slot to be drilled along its length direction. The first end and the second end of the short slot to be drilled are opposite each other. The control module 110 is also used to control the drill bit to alternately drill multiple times in the first drilling position and the second drilling position until the total drilling depth in the first drilling position and the total drilling depth in the second drilling position are both the target depth.

[0092] Specifically, the short slot processing device can be a drilling machine. The control module 110, as the control system of the drilling machine, can obtain the actual and theoretical diameters of the drill bit 120. The actual diameter can be measured by an instrument. It also obtains the target length and target depth of the short slot to be drilled. Then, based on the actual and theoretical diameters, it compensates for the target length of the short slot to be drilled, obtaining the processing length of the short slot, so that the final processed short slot length is equal to the target length. The control module 110 can also cause the drill bit to drill at the first and second drilling positions respectively. The control module 110 is also used to control the drill bit 120 to alternately drill multiple times at the first and second drilling positions until the total drilling depth at the first and second drilling positions are both the target depths, thereby correcting the slot processing offset. The final processed short slot has a regular shape, effectively solving the problem of slot shape change during slot processing, improving slot processing quality, increasing product yield, and avoiding the complex computer settings for guide hole setup and tilt angle compensation during short slot processing.

[0093] This invention provides a short slot hole machining device, which includes a control module and a drill bit. The control module and the drill bit are connected. The control module obtains the actual and theoretical diameters of the drill bit, and the target length and target depth of the short slot hole to be drilled. Based on the actual and theoretical diameters, the control module compensates for the target length of the short slot hole to be drilled, so that the final length of the machined short slot hole is equal to the target length of the short slot hole to be drilled. A first drilling position and a second drilling position are respectively set at both ends of the short slot to be drilled along its length. The first drilling position is tangent to the first edge of the short slot along its length, and the second drilling position is tangent to the second edge of the short slot along its length. The drill bit is controlled to alternately drill multiple times at the first and second drilling positions until the total drilling depth of the first and second drilling positions are both the target depth. This allows for slot machining offset correction, making the shape of the final short slot regular and enabling precise compensation for the short slot, improving the machining accuracy of the short slot, effectively solving the problem of slot shape change during slot machining, improving slot machining quality, and increasing product yield.

[0094] This invention also provides a printed circuit board with short slots formed by the short slot processing device described in this invention.

[0095] Specifically, the short slots on the printed circuit board are formed by alternating drilling at the first and second drilling positions during the manufacturing process using a short slot processing device. This results in a regular shape for the final short slots, high processing precision, and effectively solves the problem of slot shape changes during slot processing, improving slot processing quality and increasing product yield.

[0096] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A short slot hole processing method characterized by, The short slot hole processing method comprises: acquiring an actual tool diameter and a theoretical tool diameter of a drill bit, and acquiring a target length and a target depth of a short slot hole to be drilled; compensating the target length of the short slot hole to be drilled according to the actual tool diameter and the theoretical tool diameter; setting a first drilling position and a second drilling position at two ends of the length direction of the short slot hole to be drilled respectively; wherein the first drilling position is tangent to the first end edge of the length direction of the short slot hole to be drilled, the second drilling position is tangent to the second end edge of the length direction of the short slot hole to be drilled, and the first end and the second end of the short slot hole to be drilled are opposite to each other; controlling the drill bit to alternately drill at the first drilling position and the second drilling position for multiple times until the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are both the target depth.

2. The short-slot machining method according to claim 1, characterized by, The control of the drill bit to alternately drill at the first drilling position and the second drilling position until the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are both the target depth comprises: controlling the drill bit to alternately drill at the first drilling position and the second drilling position for multiple times, and the drilling depth of the drill bit increases by a preset drilling depth each time until the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are both the target depth; wherein the drill bit drills n times at the first drilling position and m times at the second drilling position, n>1, m>1, and n and m are both integers.

3. The short-slot machining method according to claim 2, characterized in that, The control of the drill bit to alternately drill at the first drilling position and the second drilling position for multiple times comprises: controlling the drill bit to drill at the first drilling position once; controlling the drill bit to alternately drill at the second drilling position and the first drilling position for multiple times; wherein the once drilling operation is an operation of the drill bit drilling at a corresponding hole position once, the twice drilling operation is an operation of the drill bit drilling at a corresponding hole position at least twice, and the drilling depth is the same each time.

4. The short-slot machining method according to claim 2, characterized by, The control of the drill bit to alternately drill at the first drilling position and the second drilling position for multiple times, and the drilling depth of the drill bit increases by a preset drilling depth each time until the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are both the target depth, comprises: controlling the drill bit to alternately drill at the first drilling position and the second drilling position for multiple times until the total drilling depth of the first drilling position and the total drilling depth of the second drilling position are both the target depth, and the drilling depth of the drill bit after each alternation satisfies: ； wherein A is the drilling depth after each alternation, a is the preset drilling depth, b is the initial drilling depth of the drill bit at the first drilling position for the first time, and i is the number of alternations.

5. The short-slot machining method according to claim 2, characterized by Before the control of the drill bit to alternately drill at the first drilling position and the second drilling position for multiple times, the method further comprises: determining the preset drilling depth according to a tool diameter and a preset drilling depth correspondence table of the drill bit; wherein different tool diameters of the drill bit in the preset drilling depth correspondence table correspond to different preset drilling depths.

6. The short-slot machining method according to claim 1, characterized by, The control of the drill bit alternately in the first drilling site and the second drilling site is drilled for multiple times until the first drilling site and the second drilling site are drilled to the target depth. Drilling is performed in the area between the first drilling site and the second drilling site.

7. The short-slot machining method according to claim 1, characterized by, The target length of the short slot hole to be drilled is compensated according to the actual tool diameter and the theoretical tool diameter, including: The target length of the short slot hole to be drilled is compensated according to the actual tool diameter and the theoretical tool diameter, and the processing length of the short slot hole to be drilled is obtained, which satisfies: L1=L+(D0-D1); Wherein, L1 is the processing length of the short slot hole to be drilled, L is the target length of the short slot hole to be drilled, D0 is the theoretical tool diameter, and D1 is the actual tool diameter.

8. The short-slot machining method according to claim 1, characterized by, The drill bit is a slotting tool, and the tool diameter of the drill bit is the same as the width of the short slot hole to be drilled.

9. A short-slot machining apparatus characterized by comprising: The short slot hole processing device is used to execute the short slot hole processing method in any one of claims 1-8, and the short slot hole processing device comprises a control module and a drill bit, and the control module and the drill bit are connected. The control module is used to obtain the actual tool diameter and the theoretical tool diameter of the drill bit, and obtain the target length and the target depth of the short slot hole to be drilled. The control module is also used to compensate the target length of the short slot hole to be drilled according to the actual tool diameter and the theoretical tool diameter. The control module is also used to set the first drilling site and the second drilling site at the two ends of the short slot hole to be drilled in the length direction, wherein the first drilling site is tangent to the first end edge of the short slot hole to be drilled in the length direction, the second drilling site is tangent to the second end edge of the short slot hole to be drilled in the length direction, and the first end of the short slot hole to be drilled is opposite to the second end. The control module is also used to control the drill bit to alternately drill in the first drilling site and the second drilling site until the first drilling site and the second drilling site are drilled to the target depth.

10. A printed circuit board, characterized by The printed circuit board is provided with a short slot hole formed by the short slot hole processing device in claim 9.

Images