TWM567148U - Structure improvement of drill - Google Patents

Abstract

The present invention relates to a structural improvement of a drill needle, comprising a drill body and a drill handle, wherein the drill body comprises two symmetrical main cutting edges, two symmetrical auxiliary cutting edges and two corresponding spirals. a chip flute, and a recess is formed at an outer edge of the main cutting edge, and the auxiliary blade edge is provided with a groove along the spiral flute, and the two spiral flutes are gradually changed from parallel to the same angle The parallel structure has a high ratio of the blade length to the diameter of the drill body, and the overall strength of the drill pin is high, the chip discharge is smooth, and the wear resistance is good.

Description

Structural improvement of the drill

The present invention provides a structural improvement of a drill needle, in particular, the drill body includes two main cutting edges, two auxiliary cutting edges and two spiral flutes, and a gap is arranged outside the main cutting edge, and the auxiliary cutting edge is along the spiral chip discharging. The groove is provided with a groove, and the two spiral chip flutes are gradually parallelized from the same angle to the parallel direction, so that the ratio of the blade length to the diameter of the drill body is high, and the chip discharge is smooth and the wear resistance is good.

According to the trend of electronic products gradually becoming lighter, thinner, shorter, smaller, high-efficiency, low-consumption, high-precision, high-stability, and intelligent, the volume of various electronic products is gradually shrinking, and it is available in various electronic products. Printed circuit boards that can be set by electronic component sets must also be reduced in size with electronic products.

Therefore, in the manufacturing process of the printed circuit board, the micro-drilled pins are usually used to drill holes in the circuit board for connecting the inner layer of the circuit board or for inserting the electronic components to form an electrical connection. However, the number of the line contacts is increased. It will promote the wiring density to increase, and the circuit board for the connection density will be pushed to the multi-layer board again. Therefore, the design of the burr structure is put forward higher, the diameter of the bur is required to be smaller, and the blade length is longer. However, the quality requirements are not reduced. The accuracy of the hole position or the quality of the hole wall will only be more and more strict. Therefore, the existing burr structure can not meet the demand of printed circuit board production.

Therefore, how to solve the above-mentioned lack of inconvenience and inconvenience is related The industry is eager to study the direction of improvement.

Therefore, in view of the above-mentioned problems and deficiencies, the creators have collected relevant information, and through multiple assessments and considerations, and through years of experience in the industry, through continuous trial and modification, we have designed the structural improvement of such burrs. The new birth.

The main purpose of the present invention is that the lance body includes two symmetrical main cutting edges, two symmetrical auxiliary cutting edges and corresponding two spiral flutes, and is concave at the outer edge of the main cutting edge. a gap, and the auxiliary blade edge is provided with a groove along the spiral chip flute, and the two spiral flutes are gradually parallelized to a parallel structure from the parallel angle, and the ratio of the blade length to the diameter of the drill body is high. In turn, the drill needle achieves the purpose of high overall strength, smooth chip discharge and good wear resistance.

1‧‧‧Drills

11‧‧‧Drill needle handle

111‧‧‧Connecting transition section

12‧‧‧Drill body

121‧‧‧Main cutting edge

122‧‧‧Main cutting edge

123‧‧‧Auxiliary blade

124‧‧‧Auxiliary blade

125‧‧‧Spiral flute

126‧‧‧Spiral chip flute

127‧‧‧ gap

128‧‧‧ Groove

13‧‧‧Three-section heart-thick taper structure

131‧‧‧The first section of the heart thickness taper

132‧‧‧Second section of heart thickness taper

133‧‧‧The third section of the heart thickness taper

The first picture is a side view of the creation.

The second picture is the front view of the creation.

The third figure is a schematic diagram of the heart-thickness taper structure of the created drill.

In order to achieve the above objectives and effects, the technical means and structure of the present invention are described in detail in the preferred embodiment of the present invention, and the features and functions are as follows.

Please refer to the first and second figures, which are a side view and a front view of the creation. As can be clearly seen from the figure, the drill 1 of the first embodiment of the present invention includes a drill handle 11 and a drill body. 12, and the shank handle 11 and the burr body 12 are separated, and the two The micro-drill 1 can be integrally formed by a welded structure, wherein:

The shank 11 is made of stainless steel, that is, the strength is reduced, and the cost is reduced. The shank 11 is generally cylindrical, and the shank 11 is connected to the lance body 12 at one end. 111.

Preferably, the connecting transition portion 111 of the drill shank portion 11 has a truncated cone shape. However, in practical applications, the side surface of the connecting transition portion 111 may also have a concave arc surface or a convex arc surface. A shape that achieves a good transition effect.

The burr body 12 can be used as a cutting portion of the entire burr 1 and is generally prepared by using a WC-Co type hard alloy having a fine grain size and a high cobalt content. In this example, a fine grain of 0.2 μm is preferable, and the Co content is 9% of high hardness, high flexural strength of hard alloy materials, thereby improving the strength of the drill string 1 for multilayer circuit boards and reducing the risk of needle breakage during drilling.

Moreover, the lance body 12 of the bur 1 and the shank handle 11 can be integrally formed by high-frequency welding.

The burr body 12 is provided with two symmetrical main cutting edges 121, 122, and two symmetrical auxiliary cutting edges 123, 124 are disposed on the other side of the two main cutting edges 121, 122, and the two main cutting edges 121 There are two corresponding spiral flutes 125 and 126 at the side of 122.

The two main cutting edges 121 and 122 are symmetrically distributed with the center point of the top of the needle body 12 (ie, the drill tip) as a symmetrical point; and the two auxiliary cutting edges 123 and 124 are respectively along the two main cutting edges 121 and 122. Also, the center point of the top of the drill body 12 (i.e., the drill tip) is symmetric, thereby forming the needle body 12 of the double-edged knife.

And the above passes through two symmetric main cutting edges 121, 122 and two pairs The auxiliary cutting edges 123 and 124 cooperate to form a double-edged knife type needle body 12, and the drill point angle α formed between the two main cutting edges 121 and 122 is between 90 and 120 degrees, which is small. The angle structure of the drill tip has good control ability for the accuracy of the hole bit, which is beneficial to the control of the hole position precision.

However, the two spiral flutes 125, 126 are respectively arranged from the drill point, spirally disposed around the drill body 12, and the two spiral flutes 125, 126 are initially parallel to the same angle, bypassing After a certain distance, the two spiral flutes 125, 126 are gradually merged to achieve parallel operation until the end is completed, so that the chip space can be increased through the thus formed groove structure, thereby ensuring chip evacuation. Smooth, to reduce the friction between the chip and the hole wall, thereby improving the quality of the hole wall.

In addition, the outer diameter of the drill body 12 is between 0.1 and 0.8 mm, and the ratio of the blade length A of the drill body 12 to the outer diameter B of the drill body 12 is between 20 and 30. Designed for high-layer board applications and meets the high efficiency of stacked boards.

Furthermore, the outer edge of the main cutting edges 121 and 122 is recessed with a gap 127, and the depth of the recessed gap 127 is 1 to 40% of the diameter of the top of the drill body 12, so that the recessed gap 127 can pass through the recessed gap 127. Effectively reducing the friction between the drill 1 and the hole wall to reduce the hole thickness and the generation of the nail head; and the edges of the auxiliary cutting edges 123, 124 are provided with grooves 128 along the two spiral flutes 125 and 126, which are concave The width of the groove 128 is 40%~80% of the length of the auxiliary cutting edges 123, 124, the depth of the groove 128 is 20%~80% of the width of the auxiliary cutting edges 123, 124, and the length of the groove 128 is 0.1 mm until the spiral flutes 125 30% of 126, the groove 128 can be used to reduce the drill 1 The axial force when drilling into the plate (shown at the end of the figure) is beneficial to improve the accuracy of the hole position, and at the same time improve the chip removal, thereby improving the heat dissipation function of the drilling process, thereby accelerating the heat during the drilling process. Dissipated to reduce the poor quality of the sheet due to heat accumulation, thus ensuring the quality of the hole wall, greatly improving the applicability of the drill 1 on the high-layer circuit board.

Referring to the third figure, it is a schematic diagram of the heart-thickness taper structure of the boring needle. It can be clearly seen from the figure that the overall structure of the burr 1 of the present invention adopts a three-stage heart-thick taper structure type 13 The three-stage core-thickness taper structure 13 includes a first-stage core-thickness taper 131, a second-stage heart-thickness taper 132, and a third-stage heart-thickness taper 133, wherein the first-stage core-thickness taper 131 is a large-heart-thickness taper, and the slope range is 0.05~0.1, the precision of the positioning of the drill pin can be further ensured, and the taper of the second section of the thick taper 132 is smaller than the first section of the taper of the first section, and the slope ranges from 0.003 to 0.03, which can improve the toughness of the drill. Improve the torsion strength of the drill needle; the third section of the heart thickness taper 133 adopts a large heart thickness design, and the heart thickness accounts for 60% to 90% of the diameter of the drill bit, so that the strength of the drill tail end can be improved, the risk of broken needle can be avoided, and the quality of the drill needle can be improved.

Compared with the existing micro drill, the micro drill needle 1 provided by the present example has the advantages of small diameter, long edge, high strength, good chip removal, and wear resistance, and can well meet the demand of high-multilayer circuit boards. .

The above description is only for the preferred embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Therefore, all the simple modifications and equivalent structural changes that are made by using the present specification and the schema contents should be included in the same reason. Within the scope of the patent of this creation, it is given to Chen Ming.

In summary, the structure of the above-mentioned dynamometer is improved in use, in order to achieve its efficacy and purpose, so this creation is a practical and excellent creation, in line with the new specialization The application requirements of Li, and the application of the law in accordance with the law, I hope that the trial committee will grant this case as soon as possible to protect the creators' hard work. If there is any doubt in the trial committee, please do not hesitate to give instructions, the creators will try their best to cooperate and feel good.

Claims (6)

The invention relates to a structural improvement of a drill needle, comprising a drill handle and a drill body, the drill handle body is connected with a drill body on one side, and the drill body comprises two symmetrical main cutting edges and two main cutting Two symmetrical auxiliary cutting edges are arranged on the other side of the blade, and two corresponding spiral flutes are arranged at the side edges of the two main cutting edges, wherein the outer cutting edge of the main cutting edge is concave and has a gap, and The edge of the auxiliary cutting edge is provided with a groove along the inner side of the spiral chip flute, and the two spiral flutes are gradually changed from a parallel angle to a parallel structure. The structural improvement of the drill needle according to claim 1, wherein the outer diameter of the drill body is between 0.1 and 0.8 mm, and the ratio of the length of the drill body to the outer diameter of the drill body It is between 20~30. The structural improvement of the drill needle according to claim 1, wherein the angle of the drill tip formed between the two main cutting edges is between 90 and 120 degrees. The structural improvement of the drill needle according to claim 1, wherein the depth of the gap is 1 to 40% of the diameter of the top of the drill body. The structural improvement of the drill needle according to the first aspect of the patent application, wherein the width of the groove accounts for 40% to 80% of the length of the auxiliary blade, and the groove depth accounts for 20% to 80% of the width of the auxiliary blade, and the groove length It is 0.1mm up to 30% of the spiral flute. The structural improvement of the drill needle according to the first aspect of the patent application, wherein the drill needle adopts a three-stage heart-thick taper structure, and the three-stage heart-thick taper structure includes a first section of the core taper and the second The segmental thickness taper and the third segment of the heart thickness taper, and the first segment of the heart thickness taper is a large heart thickness taper form, and the second segment of the heart thickness taper taper is smaller than the first segment of the heart thickness taper, and the The three sections are in the form of a large heart.