A cutter head, a drill needle for PCB board drilling and a processing method

Abstract

The present invention is applicable to the technical field of PCB drilling processing, and discloses a cutter disc, a drill needle for PCB board drilling processing, and a processing method. The drill needle includes a drill shank and a working part connected to one end of the drill shank, a transition section is arranged between the drill shank and the working part, the transition section is in a truncated cone shape, the small diameter end of the transition section is close to the working part, the large diameter end of the transition section is connected to the drill shank, the large diameter end of the transition section has a diameter smaller than the diameter of the drill shank, when the drill needle is inserted into the mounting hole of the cutter disc, the drill shank contacts and positions with the connection surface to control the length of the drill shank exposed outside the mounting hole; or, the large diameter end of the transition section has a diameter equal to the diameter of the drill shank, when the drill needle is inserted into the mounting hole of the cutter disc, the circumferential surface of the transition section contacts and positions with one end of the connection surface close to the mounting section to control the length of the drill shank exposed outside the mounting hole. The cutter disc, the drill needle for PCB board drilling processing, and the processing method provided by the present invention do not need to be used in conjunction with a sleeve ring, and have the advantages of high positioning accuracy and low use cost.

Description

Technical Field

[0001] The invention belongs to the technical field of PCB drilling processing, and in particular relates to a cutter head, a drill needle used for PCB board drilling processing, and a processing method. Background Art

[0002] As printed circuit boards (PCBs) develop towards miniaturization and thinness, the line width and line spacing of PCB circuits are becoming narrower and narrower. Manufacturers have higher and higher requirements for the positioning accuracy and drilling quality of drilling processing, while constantly pursuing cost reduction.

[0003] During the drilling process, the micro drill needs to be inserted upside down on the cutter head, so as to control the length of the micro drill protruding from the cutter head. Figure 8 As shown, a ring 5 is sleeved at a predetermined position of the drill handle, and the drill 1a of the existing structure is first stored in the cutter disc 4a, and the drilling equipment then grabs the drill 1a of the existing structure from the cutter disc 4a. Among them, the cutter disc 4a is a component for storing the drill, and a mounting hole 41a is provided on the cutter disc 4a, and a countersunk hole 43a is provided at the upper end of the mounting hole 41a, and the aperture of the countersunk hole 43a is larger than the aperture of the mounting hole 41a. When the drill 1a of the existing structure with the ring 5 is inserted into the mounting hole 41a, the ring 5 falls into the countersunk hole 43a at the upper end of the mounting hole 41a, that is, the positioning is achieved by the ring 5 and the countersunk hole 43a. However, the use of the micro drill with the ring will bring the following problems:

[0004] 1. Poor positioning accuracy of the collar. This will affect the vertical positioning accuracy of the spindle, resulting in failure to drill through the board or broken needles. For example, when processing high-frequency, high-speed, and highly interconnected 5G communication boards, broken needles or offset holes will cause the entire board to be scrapped, significantly increasing production costs.

[0005] 2. The material and shape of the collar are uneven. When rotating at high speed, the collar with uneven material will increase the fluctuation of the drill bit's rotational inertia, causing the drill bit to vibrate more, the drill point to deviate more, and produce obvious deviation holes, poor hole position accuracy and other processing defects.

[0006] 3. Special machines and operators are required to install and remove the collars, and purchasing the collars requires additional expenses, which increases the drilling cost. Summary of the invention

[0007] The present invention aims to solve at least one of the above technical problems, and provides a cutter disc, a drill needle and a processing method for PCB board drilling, which do not require the use of a ring or machine modification, and have the advantages of high positioning accuracy and low use cost.

[0008] The technical solution of the present invention is: a cutter disc, including a cutter disc body, the cutter disc body is provided with a mounting hole for installing a drill bit, the mounting hole includes a positioning section and a mounting section, the positioning section is located above the mounting section, the diameter of the positioning section is larger than the diameter of the mounting section, the positioning section and the mounting section are connected by a connecting surface, and the angle between the connecting surface and the horizontal plane is 0°-85°.

[0009] Optionally, a plurality of the mounting holes are provided, and the plurality of the mounting holes are arranged in an array.

[0010] Optionally, the mounting hole has a plurality of different length ratios of the positioning section and the mounting section.

[0011] The present invention also provides a drill needle for drilling holes in PCB boards, comprising a drill shank and a working part connected to one end of the drill shank, a transition section being arranged between the drill shank and the working part, the transition section being in a truncated cone shape, the small diameter end of the transition section being close to the working part, the large diameter end of the transition section being connected to the drill shank, the large diameter end of the transition section having a diameter smaller than the diameter of the drill shank, and when the drill needle is inserted into the mounting hole of the cutter disc as claimed in any one of claims 1 to 3, the drill shank is contacted and positioned with a connecting surface to control the length of the drill shank exposed outside the mounting hole; or, the large diameter end of the transition section has a diameter equal to the diameter of the drill shank, and when the drill needle is inserted into the mounting hole of the cutter disc as claimed in any one of claims 1 to 3, the peripheral surface of the transition section is contacted and positioned with one end of the connecting surface close to the mounting section to control the length of the drill shank exposed outside the mounting hole.

[0012] Optionally, when the diameter of the large diameter end of the transition section is equal to the diameter of the drill shank, the angle between the truncated cone generatrix of the transition section and the axis of the transition section is Among them, L3 is the distance from the small diameter end of the transition section to the bottom of the drill shank, D is the diameter of the mounting section in the mounting hole, d1 is the diameter of the small diameter end of the transition section, and H is the distance from the contact point between the circumference of the transition section and the connecting surface close to one end of the mounting section to the upper surface of the cutter disc.

[0013] Optionally, when the diameter of the large-diameter end is smaller than the diameter of the drill shank, the taper of the transition section is 0.01-0.05.

[0014] Optionally, when the diameter of the large-diameter end is smaller than the diameter of the drill shank, a chamfer is provided at the connection between the large-diameter end of the transition section and the drill shank.

[0015] Optionally, the chamfer angle is 30°-85°.

[0016] Optionally, it is characterized in that the length of the drill shank is 40%-75% of the length of the drill needle.

[0017] Optionally, the length of the working portion is 0.9 mm-10.5 mm, and the diameter of the working portion is 0.05 mm-2.7 mm.

[0018] Optionally, the outer peripheral surface of the working part is provided with two main chip removal grooves which are symmetrical about the center of the working part, and the two main chip removal grooves extend in a spiral shape from the front end toward the rear end of the working part and intersect at one point. The two main chip removal grooves respectively intersect with the front end surface of the working part to obtain two cutting edges, and the outer peripheral surface of the working part is also provided with at least two chip removal auxiliary grooves which extend spirally side by side from the intersection point to the rear end of the working part.

[0019] Optionally, the outer peripheral surface of the working part is provided with two main chip removal grooves which are symmetrical about the center of the working part, and the two main chip removal grooves extend in a spiral shape from the front end toward the rear end of the working part.

[0020] Optionally, the outer peripheral surface of the working part is provided with a main chip removal groove extending in a spiral shape from the front end toward the rear end of the working part, and the main chip removal groove intersects with the front end surface of the working part to obtain a cutting edge.

[0021] The present invention also provides a drilling method, comprising the following steps:

[0022] S1. Prepare the above-mentioned cutter disc and drill needle for PCB board drilling processing, the cutter disc is installed in the tool magazine of the drilling equipment, and the drill needle is placed in the installation hole of the cutter disc, so that the end of the drill shank connected to the transition section is in contact with the connection surface for positioning; or the peripheral surface of the transition section is in contact with the end of the connection surface close to the installation section for positioning;

[0023] S2, stacking the pad, PCB board and cover board on the work surface in sequence;

[0024] S3, drill needle The drill needle controls the main shaft of the drilling device to grab the drill needle from the mounting hole of the cutter disc, and drives the drill needle to move to the starting position of drilling; or controls the auxiliary clamp of the drilling device to grab the drill needle from the mounting hole of the cutter disc, places it on the auxiliary tool holder, and then controls the main shaft of the drilling device to grab the drill needle, and drives the drill needle to move to the starting position of drilling;

[0025] S4, starting the spindle and drilling according to a preset drilling program.

[0026] The present invention provides a cutter head, a drill bit and a processing method for drilling holes in PCB boards. In the drill bit, a truncated cone-shaped transition section is provided between the drill shank and the working part. According to the relationship between the diameter of the large diameter end of the transition section and the diameter of the drill shank, two drill bits with different structures can be obtained. When the drill bit is installed in the installation hole of the cutter head, the drill shank can be directly used for line-surface contact with the connecting surface, or the peripheral surface of the transition section can be directly used for line-surface contact with one end of the connecting surface close to the installation section to achieve positioning and matching, so as to control the length of the drill shank exposed outside the installation hole of the drill bit installed in the cutter head installation hole. When the drilling equipment automatically grabs the drill bit, the drilling accuracy of the drill bit can be effectively controlled; at the same time, the truncated cone-shaped transition section can also make the front end space of the drill bit larger, which is conducive to the dust collection device in the drilling equipment to absorb and collect chips. Compared with the drill bit with existing structure, the drill bit provided by the present invention does not need to be used with a collar, and has the advantages of high positioning accuracy, strong overall chip removal ability and low use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments 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.

[0028] Figure 1 It is a structural schematic diagram of a drill bit with a two-stage stepped structure provided by an embodiment of the present invention when the diameter of the large-diameter end is smaller than the diameter of the drill shank;

[0029] Figure 2 It is a structural schematic diagram of a drill needle with a three-stage stepped structure provided by an embodiment of the present invention when the diameter of the large-diameter end is smaller than the diameter of the drill shank;

[0030] Figure 3 is a structural schematic diagram of a drill needle provided by an embodiment of the present invention when the diameter of the large diameter end is equal to the diameter of the drill shank;

[0031] Figure 4 It is a schematic diagram of another working part structure in a drill needle with a two-stage stepped structure provided by an embodiment of the present invention when the diameter of the large-diameter end is smaller than the diameter of the drill shank;

[0032] Figure 5 is a schematic structural diagram of a cutter disc provided by an embodiment of the present invention;

[0033] Figure 6 It is a structural schematic diagram of a mounting hole in a cutter disc provided by an embodiment of the present invention;

[0034] Figure 7 yes Figure 1 The drill bit and Figure 4Schematic diagram of the middle cutter disc when positioned;

[0035] Figure 8 yes Figure 3 The drill bit and Figure 4 Schematic diagram of the middle cutter disc when positioned;

[0036] Fig. 9 It is a schematic diagram of the positioning of the drill bit and the collar of the existing structure.

[0037] In the figure, 1-drill shank, 2-working part, 20-intersection point, 21-main chip removal groove, 22-auxiliary chip removal groove, 3-transition section, 4-cutter body, 40-mounting hole, 41-mounting section, 42-connecting surface, 43-positioning section, 401-first mounting hole, 402-second mounting hole, 403-third mounting hole, 5-ring, l1-cone generatrix length of transition section, α-angle between the cone generatrix length of transition section and the axis of drill shank, L1-drill shank length, L2-transition section length, D1-drill shank diameter, d1-diameter of the small diameter end of transition section, d2-diameter of the large diameter end of transition section, d3-diameter of working part. C-chamfer, h-the length of the drill shank of the drill needle protruding outside the mounting hole, H-the distance from the positioning point to the upper surface of the cutter head body, L3-the distance from the small diameter end of the transition section to the bottom of the drill shank, D-the diameter of the mounting section, 1a-the drill needle of the existing structure, 4a-the cutter head used with the collar, 41a-the mounting hole in the cutter head used with the collar, 43a-the countersunk hole in the cutter head used with the collar, h-the standard upper ring height. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] It should be noted that the terms “setting” and “connection” should be understood in a broad sense. For example, it can be directly setting or connecting, or it can be indirectly setting or connecting through a central component or a central structure.

[0040] In addition, in the embodiments of the present invention, if there are terms indicating orientation or positional relationships such as "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., they are based on the orientation or positional relationships or conventional placement states or usage states shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure, feature, device or element referred to must have a specific orientation or positional relationship, nor must it be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] The various specific technical features and embodiments described in the specific implementation methods can be combined in any suitable manner unless there is any contradiction. For example, different implementation methods can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features / embodiments in the present invention will not be described separately.

[0042] like Figure 5 and Figure 6 As shown, a cutter disc provided in an embodiment of the present invention includes a cutter disc body 4, the cutter disc body 4 is provided with a mounting hole 40 for mounting a drill bit, the mounting hole 40 includes a positioning section 43 and a mounting section 41, the positioning section 43 is located above the mounting section 41, the diameter of the positioning section 43 is greater than the diameter of the mounting section 41, the positioning section 43 and the mounting section 41 are connected by a connecting surface 42, and the angle between the connecting surface 42 and the horizontal plane is 0°-85°.

[0043] For ease of understanding, the following is an explanation of a drill needle for PCB board drilling processing according to the present invention. The drill needle is used in situations where high hole position accuracy is required during PCB drilling. Figures 1 to 4 As shown, the drill bit includes a drill shank 1 and a working portion 2 connected to one end of the drill shank 1, and a transition section 3 may be provided between the drill shank 1 and the working portion 2, wherein the transition section 3 may be in the shape of a truncated cone, with the small diameter end of the transition section 3 close to the working portion 2, and the large diameter end of the transition section 3 connected to the drill shank 1. In this way, the front end space of the drill bit becomes larger during the drilling process, which is beneficial for the dust collection device of the drilling equipment to suck away the chips discharged from the drill hole during the drilling process. At the same time, the transition section 3 is designed to be in the shape of a truncated cone, which helps to reduce the weight of the front part of the drill bit, effectively reduce the rotation swing of the drill bit, and ensure the processing accuracy. According to the relationship between the diameter d2 of the large diameter end of the transition section and the diameter D1 of the drill shank, two drill bits with different structures can be obtained. When the drill bits of these two structures are inserted into the mounting hole 40 of the above-mentioned cutter head, there are the following two positioning and matching methods:

[0044] like Figure 7 As shown, when the diameter d2 of the large diameter end of the transition section is smaller than the diameter D1 of the drill shank, a step structure is formed between the drill shank 1 and the transition section 3. When the drill needle is inserted into the mounting hole 40 of the cutter head, the drill shank 1 can be directly positioned by contacting the connecting surface 42, that is, the drill shank 1 and the connecting surface 42 are in line-surface contact, so as to control the length of the drill shank 1 exposed outside the mounting hole 40;

[0045] like Figure 8 As shown, when the diameter d2 of the large diameter end of the transition section is equal to the drill shank diameter D1, when the drill bit is inserted into the mounting hole 40 of the above-mentioned cutter head, the circumferential surface of the transition section 3 is in contact and positioned with the connecting surface 42 at one end close to the mounting section 41 to control the length of the drill shank 1 exposed outside the mounting hole 40.

[0046] In this way, the drill needle does not need to be used in conjunction with the collar 5, and can directly use its own structure to achieve positioning and coordination with the mounting hole 40 of the cutter head, so that the length h of the drill shank 1 of each drill needle inserted into the mounting hole 40 and exposed outside the mounting hole 40 remains consistent, and when the main shaft of the drilling device automatically grabs the drill needle, the grabbing accuracy of each drill needle can be effectively controlled. Compared with the existing structure of the drill needle, it does not need to be used in conjunction with the collar 5, and has the following advantages:

[0047] 1. It can avoid the drilling position error caused by uneven material of the collar 5, thereby improving the hole position accuracy;

[0048] 2. It can avoid the axial positioning error caused by the poor position accuracy of the collar 5, thereby improving the spindle tool grasping accuracy and ultimately improving the drilling depth control accuracy;

[0049] 3. It can be used for ultra-high speed precision drilling processing. On ultra-high speed drilling rigs, it can avoid the problem of increased spindle swing of the drilling rig due to the collar 5, resulting in broken needles, poor deflection holes, and shortened spindle life.

[0050] Compared with the existing cutter discs, the cutter disc of the present invention is provided with a connecting surface 42 for positioning in the mounting hole 40, while other overall dimensions and appearances remain unchanged. Therefore, when the cutter disc is applied to various types of drilling equipment, there is no need to change the structure and dimensions of the existing drilling equipment, and it is easy to upgrade and update, with low use cost.

[0051] In the above cutter head, the angle between the connecting surface 42 and the horizontal plane may be 10°, 15°, 20°, 25°, 30°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75° or 80°, etc.

[0052] In some embodiments, the angle between the connecting surface 42 and the horizontal plane may be 70°±2°.

[0053] Alternatively, if Figure 5 As shown, a plurality of mounting holes 40 may be provided, and the plurality of mounting holes 40 may be arranged in an array.

[0054] Alternatively, if Figure 6 As shown, the mounting hole 40 has a variety of different length ratios of the positioning segment 43 and the mounting segment 41. By changing the length ratios of the positioning segment 43 and the mounting segment 41 in different mounting holes 40, when drill bits with different blade lengths are installed in the mounting hole 40, it can be ensured that the length H of the shank of the drill bits with different blade lengths exposed outside the mounting hole 40 remains the same. When the drilling equipment automatically grabs the drill bit, the drilling accuracy can be effectively controlled to meet different grabbing requirements for drill bits with different blade lengths.

[0055] In some embodiments, the mounting hole 40 may include a first mounting hole 401, a second mounting hole 402, and a third mounting hole 403, wherein the length ratios of the positioning section 43 and the mounting section 41 in the first mounting hole 401, the second mounting hole 402, and the third mounting hole 403 are different. In practical applications, the mounting hole 40 may also include a fourth mounting hole, a fifth mounting hole, a sixth mounting hole, and so on.

[0056] In some embodiments, Figure 6 As shown, the length of the positioning segment 43 in the first mounting hole 401 is the shortest, and the length of the positioning segment 43 in the third mounting hole 403 is the longest, that is, under the premise of keeping the total length of the mounting hole 40 unchanged, the length ratio of the positioning segment 43 and the mounting segment 41 in the first mounting hole 401, the second mounting hole 402 and the third mounting hole 403 can be increased successively.

[0057] Specifically, Figure 1 As shown, the blade disc body 4 may be a rectangular structure, and a plurality of mounting holes 40 distributed along the length direction of the blade disc body 4 and located in the same straight line are defined as a row, and a plurality of mounting holes 40 distributed along the width direction of the blade disc body 4 and located in the same straight line are defined as a column. In some embodiments, the sizes of any two adjacent mounting holes 40 in the same row are the same, and the sizes of any two adjacent mounting holes 40 in the same column are different. For example, the first row is all the first mounting holes 401, the second row is all the second mounting holes 402, and the third row is all the third mounting holes 403. Alternatively, the sizes of any two adjacent mounting holes 40 in the same row are different, and the sizes of any two adjacent mounting holes 40 in the same column are the same. For example, the first column is all the first mounting holes 401, the second column is all the second mounting holes 402, and the third column is all the third mounting holes 403. It can be understood that the first mounting holes 401, the second mounting holes 402, and the third mounting holes 403 can also be distributed in other ways.

[0058] For example, the first mounting hole 401 , the second mounting hole 402 , and the third mounting hole 403 may also be distributed according to a specific processing sequence, thereby facilitating drilling processing.

[0059] Specifically, the depths of the first mounting hole 401 , the second mounting hole 402 , and the third mounting hole 403 may all be 10 mm to 30 mm.

[0060] In some embodiments, the depth of the first mounting hole 401 , the second mounting hole 402 , and the third mounting hole 403 may all be 10 mm.

[0061] Optionally, the cutter disc body 4 may be made of metal material, or the cutter disc body 4 may be made of plastic. Specifically, the cutter disc may be obtained by an injection molding process.

[0062] In the above-mentioned drill needle for PCB board drilling processing, as Figure 8 As shown in the figure, when the diameter d2 of the large diameter end of the transition section is equal to the diameter D1 of the drill shank, the angle between the truncated cone generatrix of the transition section 3 and the axis of the transition section 3 is Among them, L3 is the distance from the small diameter end of the transition section 3 to the bottom of the drill shank 1, D is the diameter of the mounting section 41 in the mounting hole 40, d1 is the diameter of the small diameter end of the transition section, H is the distance from the positioning point to the upper surface of the cutter head body 4 (i.e., the distance from the contact point between the circumference of the transition section 3 and the connecting surface 42 close to one end of the mounting section 41 to the upper surface of the cutter head body 4), and the distance from the positioning point to the upper surface of the cutter head body 4 is a standard value, which is related to the design of the cutter head. That is, when the size of the mounting hole 40 in the cutter head has been determined, the angle α between the truncated cone generatrix of the transition section 3 and the axis of the transition section 3 can be determined based on the distance H from the positioning point to the upper surface of the cutter head body 4. When the drill bit design changes, the angle α between the truncated cone generatrix of the new transition section 3 and the axis of the transition section 3 is calculated by the above formula, so that the height of the drill shank 1 exposed outside the mounting hole 40 after positioning of drill bits of different designs remains consistent.

[0063] If the parameters of the drill bit are known, such as the angle α between the truncated cone generatrix of the transition section 3 and the axis of the transition section 3, the distance L3 from the small diameter end of the transition section 3 to the bottom of the drill handle 1, the diameter d1 of the small diameter end of the transition section, and the diameter D of the installation section 41 (as a standard value), then the formula The distance H from the positioning point to the upper surface of the cutter body 4 is calculated, that is, facing drill bits of different lengths, the height h of the drill shank 1 exposed outside the mounting hole 40 can be kept consistent by adjusting the position of the positioning point.

[0064] Specifically, when the diameter d2 of the large diameter end of the transition section is smaller than the diameter D1 of the drill handle, the small diameter end of the transition section 3 can be directly connected to the working part 2, and the drill needle has a two-stage stepped structure, such as Figure 1 and Figure 4 As shown, or, a connecting section may be provided between the small diameter end of the transition section 3 and the working portion 2, and the drill needle may have a three-stage stepped structure, such as Figure 2 shown.

[0065] Specifically, when the diameter d2 of the large diameter end of the transition section is equal to the diameter D1 of the drill shank, the length l1 of the truncated cone generatrix of the transition section 3 is 5 mm-15 mm.

[0066] Specifically, when the diameter d2 of the large diameter end of the transition section is equal to the diameter D1 of the drill shank, the length l1 of the truncated cone generatrix of the transition section 3 is 8 mm-12 mm.

[0067] Specifically, when the diameter d2 of the large diameter end of the transition section is smaller than the diameter D1 of the drill shank, the length of the drill shank 1 h1 = H + h can be calculated based on the distance from the positioning point to the upper surface of the cutter disc body 4 (the distance from the contact point between the end of the drill shank 1 connected to the transition section 3 and the connecting surface 42 to the upper surface of the cutter disc body 4) and the length of the drill shank 1 required to be exposed outside the mounting hole 40, wherein H is the distance from the positioning point to the upper surface of the cutter disc body 4, and h is the length of the drill shank 1 exposed outside the mounting hole 40.

[0068] Optionally, when the diameter d2 of the large diameter end of the transition section is smaller than the diameter D1 of the drill shank, the taper of the transition section 3 is 0.01-0.05. The taper of the transition section 3 can be calculated using the following formula: Taper = (d2-d1) / L2, where d2 is the diameter of the large diameter end of the transition section 3, d1 is the diameter of the small diameter end of the transition section 3, and L2 is the length of the transition section 3.

[0069] In some embodiments, the taper of the transition section 3 is 0.01.

[0070] Alternatively, if Figure 1 , Figure 2 and Figure 4 As shown, when the diameter d2 of the large diameter end of the transition section is smaller than the diameter D1 of the drill shank, a chamfer C may be provided at the connection between the large diameter end of the transition section 3 and the drill shank 1. During the drilling process, the chips are sucked by the dust suction device and can be smoothly discharged to the dust suction device along the inclined surface of the transition section 3 and the chamfer C surface.

[0071] Optionally, the angle of the chamfer C is 30°-85°.

[0072] Specifically, the angle of the chamfer C may be 40°-50°.

[0073] Optionally, the length of the drill shank 1 is 40%-75% of the length of the drill bit. By controlling the length of the drill shank 1, the drilling equipment can grasp the drill shank 1 long enough, ensuring the stability of the drill bit during the drilling process and effectively alleviating the shaking of the front end of the drill bit.

[0074] Specifically, the length L1 of the drill shank 1 is 50%-70% of the length of the drill needle.

[0075] Specifically, the length L1 of the drill shank 1 is 55%-60% of the length of the drill needle.

[0076] Optionally, the length of the working part 2 is 0.9 mm-15 mm, and the diameter of the working part 2 is 0.05 mm-2.7 mm.

[0077] Specifically, the length of the working portion 2 is 1.2 mm-10.5 mm.

[0078] More preferably, the length of the working portion 2 is 5.5 mm-10.5 mm.

[0079] Specifically, the diameter d3 of the working part 2 is 0.1 mm-2.0 mm.

[0080] Furthermore, the diameter d3 of the working part 2 is 0.1 mm-1.0 mm.

[0081] More preferably, the diameter d3 of the working part 2 is 0.1 mm-0.5 mm.

[0082] Specifically, the diameter D1 of the drill shank 1 may be 1.5 mm-3.175 mm. For example, the diameter D1 of the drill shank 1 may be 1.85 mm, 1.90 mm, 2.0 mm, 2.10 mm, 2.95 mm, 3.0 mm or 3.175 mm.

[0083] The drill bit of the present application can be applied to working parts 2 of different structures, the specific situations are as follows:

[0084] like Figure 4 As shown, the outer peripheral surface of the working part 2 may be provided with two main chip removal grooves 21 symmetrical about the center of the working part 2, the two main chip removal grooves 21 extend in a spiral shape from the front end toward the rear end of the working part 2 and intersect at a point 20, the two main chip removal grooves 21 respectively intersect with the front end surface of the working part 2 to obtain two cutting edges, and the outer peripheral surface of the working part 2 may also be provided with at least two chip removal auxiliary grooves 22 extending in a spiral parallel to each other from the intersection point 20 to the rear end of the working part 2.

[0085] Or, if Figures 1 to 3 As shown, the outer peripheral surface of the working part 2 may be provided with two main chip removal grooves symmetrical about the center of the working part 2, and the two main chip removal grooves extend in a spiral from the front end to the rear end of the working part 2, that is, a drill needle with a double-edged symmetrical structure.

[0086] Alternatively, the outer peripheral surface of the working part 2 may be provided with a main chip removal groove extending in a spiral shape from the front end to the rear end of the working part 2, and the main chip removal groove intersects with the front end surface of the working part 2 to form a cutting edge, that is, a drill with a single-edge structure.

[0087] The present invention also provides a drilling method, comprising the following steps:

[0088] S1. Prepare the above-mentioned cutter head and drill needle for PCB board drilling processing. The cutter head is installed in the tool magazine of the drilling equipment. The drill needle is placed in the installation hole 40 of the cutter head so that the end of the drill handle 1 connected to the transition section 3 is in contact with the connection surface 42 for positioning; or the peripheral surface of the transition section 3 is in contact with the end of the connection surface 42 close to the installation section 41 for positioning, ensuring that the length of the drill handle 1 exposed outside the installation hole 40 of each drill needle inserted into the cutter head installation hole 40 is consistent. In this way, when the drilling equipment grabs the drill needle, the grabbing accuracy can be effectively controlled;

[0089] S2, stacking the pad, PCB board and cover board on the work surface in sequence;

[0090] S3, control the main shaft of the drilling device to grab the drill needle from the mounting hole 40 of the cutter head, and drive the drill needle to move to the starting position of drilling; or control the auxiliary clamp of the drilling device to grab the drill needle from the mounting hole 40 of the cutter head, place it on the auxiliary tool holder, and then control the main shaft of the drilling device to grab the drill needle and drive the drill needle to move to the starting position of drilling;

[0091] S4. Start the spindle and drill according to the preset drilling program.

[0092] The embodiments of the present invention provide a cutter disc, a drill bit and a processing method for drilling holes in a PCB board. When the drill bit is inserted into the mounting hole 40 of the cutter disc, it does not need to be used in conjunction with a collar 5, thereby ensuring that the length h of the drill shank 1 of each drill bit exposed outside the mounting hole 40 remains consistent, and has the advantages of a wide range of applications, high positioning accuracy and low use cost.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A drilling method, characterized in that: The following steps are involved: S1. Prepare a cutter disc including a cutter disc body, wherein the cutter disc body is provided with a mounting hole for mounting a drill needle, wherein the mounting hole includes a positioning section and a mounting section, wherein the positioning section is located above the mounting section, wherein the diameter of the positioning section is larger than the diameter of the mounting section, wherein the positioning section and the mounting section are connected via a connecting surface, wherein the angle between the connecting surface and the horizontal plane is 0°-85°, and prepare a drill needle for PCB board drilling processing, wherein the drill needle includes a drill shank and a working part connected to one end of the drill shank, wherein a transition is provided between the drill shank and the working part. The transition section is in a truncated cone shape, the small diameter end of the transition section is close to the working part, the large diameter end of the transition section is connected to the drill shank, the diameter of the large diameter end of the transition section is less than or equal to the diameter of the drill shank, the cutter head is installed in the tool magazine of the drilling equipment, the drill needle is placed in the mounting hole, so that the end of the drill shank connected to the transition section is in contact with the connecting surface for positioning; or the peripheral surface of the transition section is in contact with the end of the connecting surface close to the mounting section for positioning, so as to control the length of the drill shank exposed outside the mounting hole; S2, stacking the pad, PCB board and cover board on the work surface in sequence; S3, controlling the main shaft of the drilling device to grab the drill needle from the mounting hole of the cutter disc, and driving the drill needle to move to the starting position of drilling; or controlling the auxiliary clamp of the drilling device to grab the drill needle from the mounting hole of the cutter disc, placing it on the auxiliary tool holder, and then controlling the main shaft of the drilling device to grab the drill needle, and driving the drill needle to move to the starting position of drilling; S4, starting the spindle and drilling according to a preset drilling program.

2. The method according to claim 1, characterized in that When the diameter of the large diameter end of the transition section is equal to the diameter of the drill shank, the angle between the truncated cone generatrix of the transition section and the axis of the transition section is Among them, L3 is the distance from the small diameter end of the transition section to the bottom of the drill shank, D is the diameter of the mounting section in the mounting hole, d1 is the diameter of the small diameter end of the transition section, and H is the distance from the contact point between the circumference of the transition section and the connecting surface close to one end of the mounting section to the upper surface of the cutter disc.

3. The method according to claim 1, characterized in that When the diameter of the large diameter end is smaller than the diameter of the drill shank, the taper of the transition section is 0.01-0.

05.

4. The method according to claim 1, characterized in that When the diameter of the large-diameter end is smaller than the diameter of the drill shank, a chamfer is provided at the connection between the large-diameter end of the transition section and the drill shank.

5. The method according to claim 4, characterized in that The chamfer angle is 30°-85°.

6. The method according to any one of claims 1 to 5, characterized in that The length of the drill handle is 40%-75% of the length of the drill needle.

7. The method according to any one of claims 1 to 5, characterized in that The length of the working part is 0.9 mm-10.5 mm, and the diameter of the working part is 0.05 mm-2.7 mm.

8. The method according to any one of claims 1 to 5, characterized in that The outer peripheral surface of the working part is provided with two main chip removal grooves symmetrical about the center of the working part, the two main chip removal grooves extend in a spiral shape from the front end toward the rear end of the working part and intersect at a point, the two main chip removal grooves intersect with the front end surface of the working part respectively to obtain two cutting edges, and the outer peripheral surface of the working part is also provided with at least two chip removal auxiliary grooves extending spirally side by side from the intersection point to the rear end of the working part.

9. The method according to any one of claims 1 to 5, characterized in that The outer peripheral surface of the working part is provided with two main chip removal grooves symmetrical about the center of the working part, and the two main chip removal grooves extend in a spiral shape from the front end toward the rear end of the working part.

10. The method according to any one of claims 1 to 5, characterized in that The outer peripheral surface of the working part is provided with a main chip removal groove extending in a spiral shape from the front end toward the rear end of the working part, and the main chip removal groove intersects with the front end surface of the working part to obtain a cutting edge.

11. The method according to claim 1, characterized in that There are multiple mounting holes, and the multiple mounting holes are arranged in an array.

12. The method according to claim 1, characterized in that The mounting hole has a plurality of different length ratios of the positioning section and the mounting section.

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