TWM559221U - Semicircular drill - Google Patents

Abstract

A semi-circular drill bit (2) can simultaneously produce a concealed top core and a guide column function during cutting to optimize the precision of the machining hole. The hole to be formed is first cut by a cutting edge having an eccentric drill tip and a chip breaking step, followed by cutting The drill body and the drill edge continue to increase the aperture. According to this, the drill tip and the stepped edge are eccentric structures, the center static point is minimized, and the chips generated during cutting are refined to achieve the advantage of minimizing the drilling resistance and improving. Precision and stability of the cutting aperture, strengthening the drill tip, the drill edge and the rigid semi-circular drill bit (2).

Description

Semi-circular drill bit (2)

The present invention relates to a cutting tool, in particular to a drill having a semi-circular single-blade structural feature, which can simultaneously produce a concealed top core during cutting, and the hole to be formed is first cut by a drill tip having a chip breaking step, followed by The drill body continuously increases the aperture. According to this, the drill tip is eccentric structure, which minimizes the center static point, and refines the chips generated during cutting to achieve the advantage of minimizing the drilling resistance, improving the precision of the cutting aperture and strengthening A semi-circular drill bit with a drill tip and a rigid body (2).

According to the conventional twist drill, the diameter of the material is mainly obtained by removing the material by two drill blades. When the drill bit cuts the material, the chips generated by the two drill blades are discharged along the discharge chute, and the chip width is large and limited. Inside the flute (slot width about 1/4 bit diameter, chip width about 1/2 bit diameter) will rub against the bore and the flute, resulting in high heat and lateral resistance, heat will be transferred quickly The drill bit and the material affect the cutting ability of the drill bit, and the lateral resistance will affect the position of the cutting hole of the drill bit. Therefore, the main technical bottleneck that the general twist drill bit needs to overcome is the accuracy of the chip removal and the drilling position.

However, for small-aperture machining, the cutting resistance is small, and the chip is excluded, but for large-aperture machining, when the diameter of the drill is larger, the cutting is The cutting resistance generated by the material is increased, so that the resistance of the cutting edge is too large, and the generated large chips are caught in the chip flute and the hole and the chip flute, causing friction and high heat, causing the surface of the aperture to be rough (raised). If the cutting is continued, the bit will be melted, and the chipping of the cutting edge will cause the problem of deep drilling fracture.

In order to solve the above problem, in the guide column type drill bit of the Republic of China Invention Patent No. I273937, as shown in the first and second figures, the drill bit (101) is provided with a center guide post (102) which is cut during cutting ( 102) With the effect of center-guided drilling and cutting and the rigidity of the drill bit (101), the positional accuracy of the aperture is improved. However, the case still has the following disadvantages: (1) The drill tip (103) is set at the center, that is, the static point. When cutting, the drill tip (103) has no cutting function but increases the cutting resistance; (2) as in the case In the figure 5, in order to reduce the cutting resistance, a plurality of grooves (105) are provided on the cutting edge (104), and the design of the discontinuous straight cutting line of the cutting edge increases the chipping ability of the drill bit (101), and The chip is reduced in a lumpy roll at the end of the cutting edge (104). Through this type of structure, the drill tip (303) is reduced on the one hand, and the chip is reduced by a plurality of cutting edges on the other hand to reduce the chip removal resistance; however, the groove (105) can be ground on the drill edge (104). Reducing the cutting resistance also reduces the rigidity of the drill bit (101), so the machining must reduce the feed rate to avoid the bit (101) wear. This way not only prolongs the machining time, but also causes the power loss, cost increase and loss of competitiveness of the machine tool.

The main purpose of this creation is to provide a semi-circular drill bit (2) having a semi-circular single-edged structural feature with at least one chip breaking station on the drill body. The step has the function of chip breaking and the function of forming the center core at the same time of rotation, and the hole diameter to be molded is high and the stability is high.

Another object of the present invention is to provide a semi-circular drill bit (2) having a reverse taper and a radially narrowing of the extension portion of the drill body, which has the advantages that the frictional resistance generated by the rotation and the frictional resistance of the fine chip can be greatly increased. Reduced, and will have excellent hole processing accuracy and stability characteristics.

A further object of the present invention is to provide a semi-circular drill bit (2) having a drill tip disposed on one side of the center line, that is, not disposed at the center, so that the drill tip can simultaneously form an invisible center of rotation center during the rotary cutting. On the one hand, it can eliminate the drill tip resistance caused by cutting, and on the other hand, a plurality of chip breaking points are formed in the aperture according to the position of the drill tip and at least one chip breaking step, so that the chip is finer and easier to discharge; High size and precision.

For the structure that can achieve the above purpose, please refer to the third to eighth figures, including: a handle body (301), a drill body (302), a drill point (303), a chip breaking step (304) and a step edge. (307), the chip breaking step (304) is disposed at the top of the drill body (302) and extends along the central axis (C) away from the drill body (302) by a distance, the chip breaking step (304) The diameter of the drill (303) is smaller than the diameter of the top of the drill body (302), and the drill tip (303) is formed by a central cutting edge (401) and a cutting edge (402) extending from the chip breaking step (304). (302) a semi-circular single-blade structure with the chip breaking step (304), the drill point (303) being disposed on one side of the central axis (C), the drill point (303) being the chip breaking step (304) The center cut edge (401) and the highest point of the drill edge (402) are defined by the cross section of the drill body (302) to define a first side (305) and a second side (306). The drill point (303) from the side of the first side (305) Tilting toward the cutting edge (401) to form a first central cutting edge angle (A1-1) [refer to the fourth figure, the angle between the cutting edge (401) and the X direction], the drilling body (302) and the chip breaking The step (304) forms a spiral stepped edge (307) having a stepped cutting angle (A2) [refer to the fifth figure, the angle between the stepped edge (307) and the Y direction], from the second The side of the side (306) is inclined toward the cutting edge (402) to form a second central cutting edge angle (A1-2) [refer to the fourth figure, the angle between the cutting edge (402) and the Y direction], and The drill body (302) is provided with a drill back clearance angle (A5) on the same side of the drill point (303).

Please refer to Figures 3 to 5 to further define the characteristics of each blade of the creation: first, the drill tip (303) is composed of a central cutting edge (401) [that is, the fourth figure has a slanted flat cutting edge] and a structure formed by tilting an arc-shaped cutting edge (402) from the drill tip (303) toward the lower right side, which can cut the workpiece through the center cutting edge (401) and the cutting edge (402); the chip breaking step has a certain a structure formed by a guide post (403) of a distance and a step cutting edge (404) on a side of the guide post (403); the stepped edge (307) is formed by the step cutting edge (404) and the drill cutting edge (405) The cutting edge portion formed.

The advantages obtained by the above-described structure creation are briefly described as follows: the drill tip (303) and the chip breaking step (304) rotate the cutting material at a high speed and simultaneously form a top end of the invisible rotation support, which is actually used during the operation ( 303) cutting the smaller aperture with the chip breaking step (304), and then cutting the hole by the step edge (307) to cut the hole larger than the chip breaking step (304), compared with the conventional technique, the chip is fined. The utility model has the advantages of (the advantage of structural strengthening) energy saving; further, the drill point (303) and the chip breaking step (304) are eccentric design, on the one hand, the central static point is minimized, and the other side forms a hidden type in the cutting operation. The top center can maintain the balance of the left and right, and strengthen the rigidity of the drill tip (303), improve the aperture precision And the stability of the drill bit is high.

In the embodiment of the present invention, as shown in the sixth figure, the drill body (302) has a drill blade edge (A5) side selectively grinds a drill cutting edge width (H), It can maintain the life of the drill body (302) during the hole processing to increase the service life of the drill body (302), and can have different drill cutting width (H) depending on the material to be cut.

In the embodiment of the present invention, as shown in the sixth figure, when the first side (305) is viewed, the drill body (302) has a drill taper (A4), and the drill body (302) extends the diameter. The advantage of reducing the contact area by shrinking is that the frictional resistance generated by the rotation and the frictional resistance of the fine chips can be greatly reduced, and excellent hole processing accuracy and stability characteristics are obtained, compared with the conventional technique of drilling the body to an equal diameter structure. The conventional structure is too large in contact with the hole, and the frictional resistance generated is too large, resulting in unstable hole size and surface precision.

In the embodiment of the present invention, as shown in the top view of the seventh figure, the drill body escape back angle (A5) is connected with a support circumferential surface (308), which can be selectively disposed on the support circumferential surface (308). At least one of the escape grooves (A5-2) can reduce the contact area of the support circumferential surface (308) with the workpiece by the arrangement of the back clearance angle (A5) and the escape groove (A5-2) of the drill body The fine chips are discharged into the escape groove (A5-2) to further reduce frictional resistance, frictional resistance of fine chips, and improve the surface precision of the holes. (Detailed description of the embodiment)

In the aforementioned semi-dome core drill, the drill tip (303) and the chip breaking step (304) form a plurality of chip breaking points during cutting, which can reduce cutting resistance and chip size. (Detailed description of the embodiment)

The creation can use a semi-circular straight edge structure as shown in the third to eighth figures. The drill body (302) can also be formed into a spiral blade shape, which forms a chip ditch and can be applied to have high ductility. Material and deep hole processing.

"practice"

(101)‧‧‧ drill bit

(102)‧‧‧ Guide column

(103)‧‧‧ drill tip

(104)‧‧‧Drilling

(105) ‧‧‧ grooves

"This creation"

(301) ‧‧‧handle

(302)‧‧‧‧

(303)‧‧‧ drill tip

(304) ‧‧‧ chip breaking steps

(305) ‧ ‧ first side

(306) ‧‧‧ second side

(307)‧‧‧Step Blade

(308)‧‧‧Support circumferential surface

(401)‧‧‧Center cutting edge

(402)‧‧‧Drilling

(403)‧‧‧ Guide column

(404) ‧‧‧step cutting

(405)‧‧‧Drilling cutting edge

(A1-1) ‧‧‧First Center Cutting Edge

(A1-2) ‧‧‧Second center cutting edge angle

(A2) ‧‧‧step cutting angle

(A4) ‧‧‧Drilling taper

(A5) ‧‧‧Drilling back angle

(A5-2) ‧‧‧ escape groove

(C) ‧ ‧ central axis

(H)‧‧‧Drilled cutting width

(S) ‧‧‧ chip breaking point

The first figure is a schematic view of the structure of a drill bit with a guide post.

The second figure is a partial enlarged view of the guide column portion of the conventional structure.

The third picture is a perspective view of the structure of the creation.

The fourth figure is a partial enlarged view of the drill tip and the chip breaking step.

The fifth picture is a partial enlarged view of the stepped blade

The sixth figure is a schematic structural view of the first side.

The seventh figure is a schematic structural view of the second side.

The eighth figure is a state diagram for the use of this creation.

In order to enable your review committee to have a better understanding and recognition of the characteristics and characteristics of this creation, the following preferred examples are listed below with reference to the following: Please refer to the third to eighth figure, the semicircular drill bit of this creation (2) The utility model mainly comprises: a handle body (301), a drill body (302), a drill point (303), a chip breaking step (304) and a step edge (307).

The handle body (301) and the drill body (302) and the chip breaking step (304) are all of the same central axis (C) structure.

Referring to Figures 3 to 5, the chip breaking step (304) is disposed on the top of the drill body (302) and extends along the central axis (C) away from the drill body (302) by a distance (forming a support) Guide post), the diameter of the chip breaking step (304) is smaller than the diameter of the stepped edge (307), and the drill tip (303) is a two-drilled edge (401, 402) extending from the chip breaking step (304) Composition.

Referring to Figures 3 to 7, the drill body (302) and the chip breaking step (304) have a semi-circular single-blade structure, and the drill point (303) is disposed on one side of the central axis (C) (in other words, Is an eccentric structure), the drill point (303) is the highest point of the cutting edge (401, 402) from which the chip breaking step (304) extends, and a section defined by the section of the drilling body (302) defines a One side (305) and a second side (306), the drill point (303) is inclined from the side of the first side (305) toward the cutting edge (401) to form a first central cutting edge angle (A1- 1) [Refer to the fourth figure, the angle between the cutting edge (401) and the X direction], the drill body (302) and the chip breaking step (304) form a spiral stepped edge, the stepped edge (307) has a step Cutting angle (A2) [refer to the fifth figure, the angle between the stepped edge (307) and the Y direction], from the side of the second side (306), the drill tip is inclined toward the cutting edge (402) to form a second center Cutting edge angle (A1-2) [refer to the fourth figure, the angle between the cutting edge (402) and the Y direction], and the drill body (302) and the same side of the drill point (303) are provided with a drill body after the escape Angle (A5). If the aperture is large, the chip breaking step (304) may also be provided with a chip breaking step escape groove (not shown) parallel to the rear corner of the drill body (A5).

Please refer to Figures 3 to 5 to further define the characteristics of each blade of the creation: first, the drill tip (303) is composed of a central cutting edge (401) [ie, the fourth figure has a tilt a flattened cutting edge] and a structure of a curved cutting edge (402) inclined downward from the drill tip (303) to the lower right, which can pass the center cutting edge (401) and the cutting edge (402) Cutting; the chip breaking step has a structure of a guide post (403) at a certain distance and a step cutting edge (404) on a side of the guide post (403); the stepped edge (307) is cut by the step (404) A cutting edge portion formed by the drill cutting edge (405).

Through the above structure, the advantages obtainable by the present creation are briefly described as follows: As shown in the eighth figure, the drill tip (303) and the chip breaking step (304) rotate the cutting material at a high speed and simultaneously form the invisible rotating support center. The axial resistance generated during cutting is converted into a plurality of component forces, and the drill tip (303) of the present invention is not centered, so the center static point is minimized, the axial resistance is small, and the resistance of each blade portion under rotation is naturally increased. The feed rate of the cutting increases the working efficiency while maintaining the aperture accuracy and high stability.

Referring to the eighth figure, in the actual operation, the drill tip (303) and the chip breaking step (304) first cut out a smaller aperture, and then the step cutting edge (307) is used to cut the hole larger than the chip breaking step (304). The aperture has an energy-saving effect; in addition, the drill tip (303) and the chip breaking step (304) are eccentrically designed to form a hidden top center during the cutting operation to maintain a balance between left and right (ie, cutting to maintain dynamic balance) And the rigidity of the drill tip (303) is strengthened, the aperture precision is improved, and the stability of the drill bit is high.

Please refer to the fourth to seventh figures (especially the partial enlarged view at the sixth figure C), the drill body (302) having the side of the drilled back clearance angle (A5) for selectively grinding a drill body The blade width (H) can maintain the life of the drill body (302) during the hole processing to increase the service life of the drill body (302), and the width of the drill body can be different depending on the material properties of the cutting (H) .

Referring to Figures 3 to 7, when viewed from the first side (305), the drill body has a drill taper (A4), and the extension of the drill body (302) is radially reduced, which has the advantage that it is generated by rotation. The frictional resistance and the frictional resistance of the fine chips can be greatly reduced, and the excellent hole processing precision and stability characteristics can be obtained. Compared with the conventional technology, the drilled body and the hole contact surface are too large, and the friction generated is relatively large. Excessive resistance results in unstable hole size and surface accuracy. In some embodiments, the chip breaking step (304) may also have the feature of a drill taper (A4).

As shown in the seventh figure, the drill back escape angle (A5) is connected with a support circumferential surface (308), and at least one escape groove can be selectively disposed on the support circumferential surface (308) (A5- 2), by the setting of the back angle of the drill body (A5) and the escape groove (A5-2), the contact area between the support circumferential surface (308) and the workpiece can be reduced, and the frictional resistance and the frictional resistance of the fine chip are further reduced. And improve the surface accuracy of the hole. In the seventh figure, the relief back angle (A5-2) can be equally divided, or there can be only one escape back angle (A5-2) as in the fourth and sixth figures, wherein the escape back angle (A5) -2) In addition to the seventh figure being a planar structure, as shown in the sixth figure, the back clearance angle (A5-2) is an arc-shaped groove structure, and further the escape groove (A5- 2) Micro-chips can also be discharged into the grooves during rotation to reduce the possibility of fines and aperture friction, thereby improving the surface accuracy of the holes and the life of the drill.

Referring to the eighth figure, when the creation is rotated, the drill point (303) and the chip breaking step (304) and the step edge (307) form a plurality of chip breaking points (ie, the dotted line indicates the position), whenever the chip is cut. After chip breaking point, chip breaking, the chip is reduced, which can reduce the advantage of cutting resistance and drilling resistance minimization. The fine chips generated by the cutting are quickly discharged into the hole, reducing the friction of the chip in the hole and increasing the hole. Surface accuracy.

The creation can use a semi-circular straight edge structure as shown in the third to eighth figures. The drill body (302) can also be formed into a spiral blade shape, which forms a chip ditch and can be applied to have high ductility. Material and deep hole processing.

Through the above description, the creation has the following advantages: when cutting a large aperture, deep hole machining, the drill body (302), the drill tip (303), the chip breaking step (304), the step edge (307) when cutting. The generated axial resistance is transformed into a plurality of component forces, and the axial resistance of the creation is small, and the central static point is minimized, which naturally increases the feed rate of the cutting to improve the working efficiency while maintaining the aperture precision and high stability. And when this creation uses all of the above technical features, the drill taper (A4) can reduce the frictional resistance between the drill body (302) and the hole, while the drill back escape angle (A5) and at least one escape. The gap groove (A5-2) can also reduce the contact area between the drill body (302) and the hole, and at the same time assist the chip removal, improve the hole precision, and further enhance the industrial upgrade.

In summary, the composition of this creation has not been seen in the publications or public use, and it is in line with the requirements of the invention patent application, so please ask the Bureau to express the patent, and grant the patent as soon as possible.

For those who need to be identified, the above is the technical principle that is applied immediately by the specific implementation of this creation. If the changes made according to the concept of this creation have not yet exceeded the spirit of the manual and the schema, All should be included in the scope of this creation, combined with Chen Ming.

Claims (10)

A semicircular drill bit mainly comprises: a handle body (301), a drill body (302), a drill point (303), at least one chip breaking step (304) and a step edge (307), the handle body (301) is the same central axis (C) structure as the drill body (302) and the chip breaking step (304), and the chip breaking step (304) is disposed on the top of the drill body (302) along the central axis (C) extending a distance away from the drill body (302), the diameter of the chip breaking step (304) being smaller than the diameter of the top of the drill body (302), the drill point (303) being the chip breaking step ( 304) The two drill edges (401, 402) are extended, and the drill body (302) and the chip breaking step (304) have a semi-circular single-blade structure, and the drill point (303) is disposed on the central axis ( On one side of C), the drill point (303) is the highest point of the cutting edge (401, 402) from which the chip breaking step (304) extends, and a section defined by the section of the drilling body (302) defines a One side (305) and a second side (306), the drill point (303) is inclined from the side of the first side (305) toward the cutting edge (401) to form a first central cutting edge angle (A1- 1), the drill body (302) forms a spiral stepped edge (307) with the chip breaking step (304), and the stepped edge (307) has a step a cutting angle (A2) from the side of the second side (306) that is inclined toward the cutting edge (402) to form a second center cutting edge angle (A1-2), and the drilling body (302) A drill escape angle (A5) is disposed on the same side of the drill tip (303). The semi-circular drill bit according to claim 1, wherein the drill body (302) has a drill cutting edge width (H) selectively slidable on a side of the drilled back angle (A5). The semi-circular drill bit according to claim 1, wherein the drill body (302) has a drill taper (A4), and the extension portion of the drill body (302) is radially reduced. The semicircular drill bit according to claim 1, wherein the drill body has a rear corner (A5) is connected to a supporting circumferential surface (308), and at least one of the escape grooves (A5-2) is selectively disposed on the supporting circumferential surface (308), and the rear corner of the drilled body (A5) The arrangement of the escape groove (A5-2) can reduce the contact area of the support circumferential surface (308) with the workpiece and can discharge fine chips into the groove, thereby reducing the possibility of fines and aperture friction, thereby improving the hole surface. Precision and bit life. The semicircular drill bit according to claim 1, wherein the drill point (303) and the chip breaking step (304) form a plurality of chip breaking points during cutting. The semi-circular drill bit according to claim 1, wherein the drill body (302) has a straight edge shape. The semicircular drill bit according to claim 1, wherein the drill body (302) is formed by a spiral blade. The semi-circular drill bit according to claim 1, wherein the chip breaking step (304) is further provided with a chip breaking step escape groove parallel to the rear corner of the drill body (A5). The semi-circular drill bit according to claim 1, wherein the chip breaking step (304) may also have a feature of a drill taper (A4). The semicircular drill bit according to claim 1, wherein the drill point (303) is composed of a central cutting edge (401) and a drilling edge (402) inclined from the drill point (303) to the lower right. a structure; the chip breaking step (304) has a structure of a guide post (403) having a certain distance and a step cutting edge (404) on a side of the guide post (403); the step edge (307) is A cutting edge portion formed by the step cutting edge (404) and the drill cutting edge (405).