A drilling equipment for PCB production

Abstract

The application discloses a drilling equipment for PCB production and belongs to the technical field of PCB production. The drilling equipment is characterized in that a dust absorption seat is arranged at the output end of a PCB drilling machine, a drill bit is connected to the output end of the PCB drilling machine, two cutting heads are arranged at the outer end of the drill bit, and the cutting heads comprise a plurality of crushing blades, a plurality of outer rotary cutting blades and an inner cutting blade. The inner cutting blade and the plurality of crushing blades are radially arranged at the outer end of the drill bit from inside to outside, and the end faces of the inner cutting blade and the plurality of crushing blades are axially contracted to the inside along the rotation direction. The outer rotary cutting blades are arranged between the inner cutting blade and the crushing blades and between the crushing blades, and the axial positions of the outer rotary cutting blades are located to the inside of the front ends of the inner cutting blade and the crushing blades in rotation and crushing. The drilling is performed in the mode of first cracking and crushing and then cutting. Compared with traditional grinding, the drilling equipment can greatly reduce frictional heat on one hand, improve the efficiency of drilling advancement on the other hand, avoid drill bit deformation caused by high temperature, and ensure the drilling precision.

Description

A drilling device for PCB board production Technical Field

[0001] This invention relates to the field of PCB manufacturing technology, and more specifically to a drilling device for PCB manufacturing. Background Technology

[0002] PCB drilling is the precise drilling process used to install electronic components or connect circuits on a printed circuit board (PCB). PCB drilling is typically performed using specialized PCB drilling machines. Due to the thinness of PCB materials, fine drill bits are required, generally around 2mm-6mm in diameter. The quality of PCB drilling has a significant impact on the performance and stability of the circuit.

[0003] Commonly used drill bits for PCB drilling machines include straight-blade drill bits and center drill bits. Straight-blade drill bits have a flat, straight edge at the end, while center drill bits have a sharp, small conical end. The drill bits are rotated by the drilling machine and advance axially to squeeze and cut holes in the PCB board. The main cutting principle is to grind the PCB board by using the straight edge or the beveled edge of the conical end during rotation. The grinding debris is discharged through the spiral grooves on the outer surface of the drill bit and collected by a dust collection seat. Drilling by grinding can easily generate high temperatures and accelerate drill bit wear, reducing its service life. At the same time, the axial advance speed is relatively slow, affecting drilling efficiency. In addition, it is generally required that the drilling positioning error be less than 50µm and the diameter error be less than 10µm. Traditional drill bits are prone to generating high temperatures during drilling, which can cause axial deformation of the drill bit and affect drilling accuracy.

[0004] Based on the above problems, this invention proposes a drilling device for PCB board production. Summary of the Invention

[0005] To address the problems mentioned in the background, the present invention aims to provide a drilling device for PCB board production. Compared with traditional grinding with axial drilling, the design concept of first breaking and then cutting can improve the efficiency of axial drilling and avoid the large amount of heat generated by grinding. At the same time, the redesigned and integrated dust collection structure can extend and retract axially, increasing the stability of drilling positioning and protecting the rotation of the shaft. This solves the problems mentioned in the background of existing PCB drilling machines, such as high temperature, low hole formation efficiency, and reduced drilling accuracy caused by grinding.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A drilling device for PCB board production includes a PCB drill, a dust collection seat installed at the output end of the PCB drill, a drill bit connected to the output end of the PCB drill, and two cutting heads provided at the outer end of the drill bit. The cutting heads include multiple breaking blades, multiple external rotary cutting blades, and an internal cutting blade. The internal cutting blade and the multiple breaking blades are arranged radially from the inside to the outside at the outer end of the drill bit. At the same time, the end faces of the internal cutting blade and the multiple breaking blades contract axially inward along the rotation direction. External rotary cutting blades are provided between the internal cutting blade and the breaking blades and between the breaking blades, and the axial position of the external rotary cutting blades is inside the rotating breaking front end of the internal cutting blade and the breaking blade.

[0008] In the above technical solution, during drilling, the front ends of multiple breaking blades and internal cutting blades along the rotation direction contact the PCB board first. During rotation, the surface of the PCB board is scratched by multiple breaking blades, and the scratching trajectory is circular. Then, due to axial advancement, multiple external rotating cutting blades rotate and cut the already scratched PCB board. This process is carried out step by step, drilling by first scratching and breaking and then cutting. Compared with traditional grinding, this method can greatly reduce frictional heat generation and improve drilling efficiency. At the same time, it can also avoid drill bit deformation caused by high temperature, ensuring drilling accuracy.

[0009] In the above technical solution, furthermore, ribs are provided on the inner side of the rotating crushing front end of the inner cutting blade and the crushing blade.

[0010] Furthermore, in the above technical solution, the drill bit also includes a drill body. The outer wall of the drill body is provided with two spiral grooves. The outer ends of the two spiral grooves penetrate the outer end face of the drill body. At the same time, an inner groove extending towards the center of the end face is provided at the penetration point. The outer end face of the drill body forms two symmetrical base surfaces. One side of the cutting head is mounted on the base surface, and the other side extends outward from the inner groove and has multiple breaking blades and internal cutting blades. The multiple breaking blades are arranged concentrically in an arc shape.

[0011] Furthermore, in the above technical solution, the dust collection base includes a fixed box connected to the external dust collection device and a sliding cylinder on the fixed box that is axially elastically telescopic with respect to the PCB drilling machine shaft. The outer end of the sliding cylinder has a radially penetrating air intake.

[0012] Furthermore, in the above technical solution, one end of the drill body is connected to the output end of the PCB drill rig via a coupling, and the drill body passes through the fixed box. A connection port is provided on one side of the fixed box, and the fixed box is connected to the connection plate provided at the output end of the PCB drill rig.

[0013] Furthermore, in the above technical solution, the fixed box is provided with a positioning hole, and multiple wing plates are connected to the outer side of the sliding cylinder. The wing plates are connected with pins, which are inserted into the positioning hole. The pins are connected to the inner side of the positioning hole through a telescopic rod, and an elastic element is fitted on the telescopic rod.

[0014] Furthermore, in the above technical solution, a radial cross brace is provided inside the sliding cylinder, and a bushing is provided in the middle of the cross brace, through which the drill body passes.

[0015] Furthermore, in the above technical solution, a rubber strip is provided on the outer end face of the sliding cylinder.

[0016] In the above technical solution, the drill bit is made of cemented carbide.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] This invention features two cutting heads on the outer end of a drill bit, each head comprising multiple breaking blades, multiple external spiral cutting blades, and an internal cutting blade. The internal cutting blade and the multiple breaking blades are radially arranged from the inside out at the outer end of the drill bit. Simultaneously, the end faces of the internal cutting blade and the multiple breaking blades contract axially inward along the rotation direction. External spiral cutting blades are positioned between the internal cutting blade and the breaking blades, and between the breaking blades themselves, with their axial position inside the rotating breaking front end of the internal cutting blade and the breaking blades. During drilling, the front ends of the multiple breaking blades and the internal cutting blade contact the PCB board material first. During rotation, the multiple breaking blades scratch the surface of the PCB board material, creating a circular scratch trajectory. Then, due to axial advancement, the multiple external spiral cutting blades rotate and cut the already scratched PCB board material. This gradual process of scratching and breaking followed by cutting significantly reduces frictional heat generation compared to traditional grinding, while also improving drilling efficiency and preventing drill bit deformation caused by high temperatures, thus ensuring drilling accuracy. Attached Figure Description

[0019] Figure 1 is a perspective view of the drilling equipment provided in Embodiment 1 of the present invention;

[0020] Figure 2 is a three-dimensional view of the PCB drilling machine, dust collection base and drill bit separated according to Embodiment 1 of the present invention;

[0021] Figure 3 is a partial perspective view of the drill bit provided in Embodiment 1 of the present invention;

[0022] Figure 4 is a partial perspective view of the drill bit provided in Embodiment 1 of the present invention;

[0023] Figure 5 is a perspective view of the blade head installation provided in Embodiment 1 of the present invention;

[0024] Figure 6 is a perspective view of the blade head provided in Embodiment 1 of the present invention;

[0025] Figure 7 is a perspective view of the blade head provided in Embodiment 2 of the present invention;

[0026] Figure 8 is a three-dimensional disassembled view of the vacuum cleaner seat provided in an embodiment of the present invention.

[0027] In the diagram: 100, PCB drilling rig; 110, connecting board;

[0028] 200. Vacuum holder; 210. Fixing box; 211. Connecting port; 212. Positioning hole; 220. Sliding cylinder; 221. Air intake; 230. Rubber strip; 240. Wing plate; 250. Pin; 260. Telescopic rod; 270. Elastic element; 280. Cross brace; 281. Bushing;

[0029] 300, Drill bit; 310, Drill body; 320, Inner groove; 330, Base surface; 340, Cutting head; 341, Breaking blade; 342, Outer spiral cutting blade; 343, Inner cutting blade; 350, Rib plate. Detailed Implementation

[0030] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] Example 1

[0032] As shown in Figure 3-6, the drill bit 300 consists of a drill body 310 and two cutting edges 340. The drill bit 300 is made of cemented carbide, machined from tungsten, cobalt, and other metal powders, and has advantages such as high hardness, high strength, high precision, and high wear resistance. The cutting edges 340 are fan-shaped. The outer wall of the drill body 310 has two spiral grooves with a 180-degree rotational spacing. The two spiral grooves penetrate one end of the drill body 310, and at the penetration point, there is an inner groove 320 extending circularly towards the end face. At the same time, the end face is surrounded by the two inner grooves 320. The drill bit is divided into two fan-shaped base surfaces 330. The cutting head 340 is installed concentrically with the end face. One fan-shaped edge of the cutting head 340 partially overlaps with the base surface 330 and is fixedly connected. On the other fan-shaped edge of the cutting head 340, an inner cutting edge 343 and multiple breaking edges 341 are installed from the circle outwards. The multiple breaking edges 342 are arc-shaped. The cutting head 340, the inner cutting edge 343, and the multiple breaking edges 341 contract towards the other end of the drill body 310 along the outer end face of the rotation direction, so that the inner cutting edge 343 and the multiple breaking edges 341... The crushing blade 341 has a protruding cutting head along its rotating front end. External rotating cutting blades 342 are provided between the inner cutting blade 343 and the crushing blade 341, and between the crushing blades 341 themselves. The axial position of the external rotating cutting blades 342 is inside the rotating crushing front end of the inner cutting blades 343 and 341. The top surface of the internal cavity formed by the external rotating cutting blades 342, the inner cutting blades 343 or 341 on both sides, and the cutting head 340 is arc-shaped, thus pushing the cut debris into the inner groove 320, thereby achieving [the desired effect] in the drill bit 3. During the rotation and advancement process, the rotating front ends of the inner cutting edge 343 and the breaking edge 341 perform ring-shaped cutting and scratching on the PCB board. During the continuous advancement process, the outer rotating cutting edge 342 cuts away the already scratched PCB board. The generated debris is discharged from the drill hole through the inner groove 320 and the spiral groove. Compared with traditional grinding, it can greatly reduce frictional heat generation and improve the drilling advancement efficiency. At the same time, it can also avoid drill bit deformation caused by high temperature and ensure drilling accuracy.

[0033] Example 2

[0034] As shown in Figure 7, the only difference between the blade head 340 proposed in this embodiment and the first embodiment is that the inner cutting blade 343 and the inner side of the rotating crushing front end of the multiple crushing blades 341 are provided with ribs 350, which increases the overall stability of the multiple crushing blades 341 and the inner cutting blade 343, and ensures that the stress received during the cutting process can maintain a good cutting angle and not deform.

[0035] Example 3

[0036] As shown in Figures 1, 2, and 8, the output end of the PCB drill 100 is equipped with a connecting plate 110. The PCB drill 100 is connected to a mechanism that controls its lifting and horizontal sliding through the connecting plate 110. These mechanisms are all existing technologies and will not be described in detail here. Meanwhile, the dust collection base 200 includes a fixed box 210. Both sides of the fixed box 210 are connected to the connecting plate 110 via corner plates and bolts. The inner side of the fixed box 210 has a sliding cavity. One side of the fixed box 210 has an air intake 221 connected to the outer dust removal mechanism. The output end of the PCB drill 100 is connected to one end of the drill bit 300 via a coupling. The drill bit 300 penetrates the fixed box 210. The outer side of the sliding cavity has a positioning hole 212 for telescopic movement. A sliding cylinder 220 is slidably installed inside the sliding cavity. A pin 250 is connected to the outer side of the sliding cylinder 220 via a wing plate 240. The pin 250 is inserted into the positioning hole 212, and the pin 250 and the positioning hole 212 are aligned. The inner bottom surfaces of the 12 are connected by a telescopic rod 260, and an elastic element 270 is fitted on the telescopic rod 260. The elastic element 270 is a spring. The outer end of the sliding cylinder 220 is provided with multiple air intakes 221. Multiple rubber strips 230 of uniform diameter are installed on the outer end of the sliding cylinder 220. A cross brace 280 is also installed inside the sliding cylinder 220 near the outer end. A bushing 281 is provided in the middle of the cross brace 280. The drill body 310 passes through the bushing 281. When axially pushing the drill hole, the multiple rubber strips 230 on the outer end of the sliding cylinder 220 are squeezed and positioned to ensure the stability of the drill bit 300 when rotating at high speed. At the same time, the generated debris enters the sliding cavity of the fixed box through the sliding cylinder 220 and finally enters the external dust removal mechanism through the air intake 221. This realizes the function of collecting the debris generated by drilling, while also protecting the drill bit 300 from rotation and positioning the drilling point.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A drilling device for PCB board production, comprising a PCB drill (100), wherein a dust collection base (200) is installed at the output end of the PCB drill (100), characterized in that: A PCB drilling machine (100) has a drill bit (300) connected to its output end. Two cutting heads (340) are provided on the outer end of the drill bit (300). Each cutting head (340) includes multiple breaking blades (341), multiple external rotary cutting blades (342), and an internal cutting blade (343). The internal cutting blade (343) and multiple breaking blades (341) are radially arranged from the inside to the outside of the drill bit (300). Simultaneously, the end faces of the internal cutting blade (343) and multiple breaking blades (341) contract axially inward along the rotation direction. External rotary cutting blades (342) are provided between the internal cutting blade (343) and the breaking blades (341) and between the breaking blades (341) themselves. Furthermore, the external rotary cutting blades (342) are positioned such that... 2) The axial position is located inside the rotating crushing front end of the inner cutting edge (343) and the breaking edge (341); the drill bit (300) also includes a drill body (310), the outer wall of the drill body (310) is provided with two spiral grooves, the outer ends of the two spiral grooves penetrate the outer end face of the drill body (310), and at the same time, an inner groove (320) extending towards the center of the end face is provided at the penetration point. The outer end face of the drill body (310) forms two symmetrical base surfaces (330). One side of the cutting head (340) is installed on the base surface (330), and the other side extends outward from the inner groove (320) with multiple breaking edges (341) and inner cutting edges (343). The multiple breaking edges (341) are arranged concentrically in an arc shape.

2. The drilling equipment for PCB board production according to claim 1, characterized in that, The inner cutting edge (343) and the crushing edge (341) are provided with ribs (350) on the inner side of the rotating crushing front end.

3. The drilling equipment for PCB board production according to claim 1, characterized in that, The vacuum cleaner base (200) includes a fixed box (210) for connecting to an external vacuum cleaner and a sliding cylinder (220) on the fixed box (210) that is elastically telescopic with respect to the axial rotation of the PCB drill (100) shaft. The outer end of the sliding cylinder (220) has a radially penetrating air intake (221).

4. The drilling equipment for PCB board production according to claim 1, characterized in that, One end of the drill body (310) is connected to the output end of the PCB drill (100), and the drill body (310) passes through the fixed box (210). The fixed box (210) has a connection port (211) on one side, and the fixed box (210) is connected to the connection plate (110) provided at the output end of the PCB drill (100).

5. A drilling device for PCB board production according to claim 4, characterized in that, The fixed box (210) is provided with a positioning hole (212). Multiple wing plates (240) are connected to the outside of the sliding cylinder (220). The wing plates (240) are connected to the pins (250). The pins (250) are inserted into the positioning hole (212). The pins (250) are connected to the inner side of the positioning hole (212) through the telescopic rod (260). An elastic element (270) is fitted on the telescopic rod (260).

6. A drilling device for PCB board production according to claim 5, characterized in that, The sliding cylinder (220) is provided with a radial cross brace (280), and a bushing (281) is provided in the middle of the cross brace (280). The drill body (310) passes through the bushing (281).

7. A drilling device for PCB board production according to claim 6, characterized in that, A rubber strip (230) is provided on the outer end face of the sliding cylinder (220).

8. The drilling equipment for PCB board production according to claim 1, characterized in that, The drill bit (300) is made of cemented carbide.

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