CN204524358U - Cloud shaped long drill - Google Patents

Abstract

The utility model relates to the technical field of deep hole processing tools, and discloses a cloud-shaped long drill, which includes a drill body, a drill handle and a drill tip. The drill tip is provided with two centrally symmetrical main cutting edges, two transverse edges, and two The chisel edge rake face, two first flanks and two second flanks, the main cutting edge is connected to one end of the chisel edge and is located on the edge of the first flank, the first flank and the second flank They are respectively located on both sides of the chisel edge, and the rake surface of the chisel edge is located between the chisel edge and the second relief surface, and the rake angle of the chisel edge is positive; the surface of the drill body is provided with two spiral grooves extending around its central axis and Two tooth backs and two main margins and two secondary margins symmetrical to the center, the spiral grooves, tooth backs, main margins and secondary margins are arranged alternately; the cloud-shaped long drill also includes two parallel helical margins running through its two ends The two internal cooling holes of the groove start from the rear end face of the drill shank and end at the two first flanks. The cloud-shaped long drill improves the processing quality, improves the processing efficiency, prolongs the service life and reduces the cost.

Description

Cloud shaped long drill

technical field

The utility model relates to the technical field of deep hole processing tools, in particular to a cloud-shaped long drill.

Background technique

At present, in the automotive industry and other industries, there are many deep hole processing. Moreover, there are various types of materials for deep hole processing products, and the requirements for processing efficiency and precision are high, which puts forward higher requirements for the use of cutting tools.

When the hole depth reaches 20 to 30 times the diameter, machining will become very difficult. In deep hole processing, tungsten steel drills with internal cooling are mainly used, but due to the poor rigidity of the deep hole processing tools and the harsh processing environment, the quality stability of the processed products is not good, and the processing efficiency is low, and the tool wear Fast, high cost.

Utility model content

The purpose of the utility model is to provide a cloud-shaped long drill, aiming at solving the problems of fast wear, high cost, poor processing quality and low processing efficiency of the existing deep hole processing drill in the prior art.

The utility model provides a cloud-shaped long drill, which comprises a drill body, a drill shank arranged at one end of the drill body, and a drill tip arranged at the other end of the drill body, and the drill tip is provided with a centrally symmetrical Two main cutting edges, two chisel edges, two chisel rake faces, two first relief surfaces and two second relief surfaces, the main cutting edges are located on one edge of the first relief surface, and the One end of the main cutting edge is connected to one end of the chisel edge, the first relief surface and the second relief surface are distributed on both sides of the chisel edge, and the rake surface of the chisel edge is located at the Between the edge and the second flank, the chisel rake angle of the chisel rake surface is a positive rake angle;

The surface of the drill body is provided with two helical grooves and two tooth backs extending around its central axis. a belt and two secondary margins, the primary margins and the secondary margins are arranged alternately;

The cloud-shaped long drill also includes two internal cooling holes running through its two ends, the two internal cooling holes are respectively parallel to the two spiral grooves, and the two internal cooling holes start from the rear end surface of the drill shank and end at the Two of the first flanks.

Preferably, the width of the main margin is two-thirds of the width of a standard drill margin.

Further, the diameter of the outer circle where the main land is located is greater than the diameter of the outer circle where the tooth back is located, and the difference between the two diameters is in the range of 0.1 mm to 0.3 mm.

Preferably, the width of the secondary margin is half of the width of the standard drill margin.

Further, a chamfered surface of the secondary land is provided between the secondary land and the spiral groove, and the angle between the chamfered surface of the secondary land and the horizontal plane is 15-30°.

Preferably, the helix angle of the helical groove ranges from 30° to 35°.

Further, a water inlet groove is provided on the rear end surface of the drill shank, and the two internal cooling holes communicate with the water inlet groove.

Preferably, a drill neck is provided between the drill shank and the drill body, and two ends of the drill neck are respectively connected to the drill shank and the drill body.

Based on the above-mentioned technical solution, the embodiment of the utility model provides two centrally symmetrical main cutting edges, two chisel edges, two chisel rake faces, two first relief surfaces and two second relief surfaces on the drill tip, And the chisel rake angles of the two chisel rake surfaces are positive rake angles, so that the sharpness and strength of the drill point are effectively combined; by setting two main margins and two secondary margins on the surface of the drill body, not only reduces the It reduces the cutting resistance, improves the processing efficiency, ensures the stability of cutting, improves the quality of the processed hole, prolongs the life of the drill bit, and reduces the cost; Two internal cooling holes make chip removal smoother, improve the processing environment of deep hole processing, and improve the quality of processed holes.

Description of drawings

Fig. 1 is the structural representation of cloud-shaped long drill in the utility model embodiment;

Fig. 2 is a schematic plan view of the drill tip part of the cloud-shaped long drill in the embodiment of the present invention;

Fig. 3 is the partial three-dimensional structure schematic diagram of the cloud-shaped long drill in the utility model embodiment;

Fig. 4 is another schematic plan view of the drill tip part of the cloud-shaped long drill in the embodiment of the present invention;

Fig. 5 is the sectional schematic diagram of N-N tangential among Fig. 4;

FIG. 6 is a schematic cross-sectional view of the Q-Q tangent in FIG. 4 .

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figures 1 to 6, the utility model embodiment proposes a cloud-shaped long drill, which includes a drill tip 1, a drill body 2, a drill neck 3 and a drill handle 4, wherein the drill body 2 and The drill neck 3 is located between the drill tip 1 and the drill shank 4, where the drill tip 1, the drill body 2, the drill neck 3 and the drill shank 4 are sequentially arranged. Specifically, for the drill point 1, it is located at the front end of the cloud-shaped long drill, and the drill point 1 plays the main role of cutting during deep hole processing; for the drill body 2, its front end and the rear end of the drill point 1 connection, the drill body 2 mainly plays the role of support, smoothing and chip removal during processing; for the drill neck 3, its front end is connected with the rear end of the drill body 2, and the main function of the drill neck 3 is to increase the cloud shape. The effective working length of the long drill improves the overall rigidity; for the drill shank 4, its front end is connected with the rear end of the drill neck 3, and the drill neck 3 is mainly used for positioning and clamping.

For the drill body 2, two helical grooves 21 and two tooth backs 22 are provided on its surface. Here, the two helical grooves 21 and the two tooth backs 22 are all spiraled on the surface of the drill body 2 and extend along the central axis a of the drill body 2. Two helical grooves 21 and two tooth backs 22 are alternately arranged, that is, a distribution of "one helical groove 21-one tooth back 22-another helical groove 21-another tooth back 22"; Two centrally symmetrical main lands 23 and two centrally symmetrical secondary lands 24, here, the two main lands 23 and two secondary lands 24 are arranged alternately, that is, "one main land 23-one secondary land" Margin 24-another main margin 23-another secondary margin 24" distribution. In summary, the distribution form of the two helical grooves 21, the two tooth backs 22, the two main margins 23 and the two secondary margins 24 on the surface of the drill body 2 is: one helical groove 21-one main margin 23-one tooth Back 22-a secondary land 24-another spiral groove 21-another main land 23-another tooth back 22-another secondary land 24.

For the drill tip 1, there are two centrally symmetrical main cutting edges 11, two centrally symmetrical chisel edges 12, two centrally symmetrical chisel edges 13, and two centrally symmetrical chisel edges. A flank 14 and two second flanks 15 that are centrally symmetrical. Here, the center of symmetry is the center 101 of the drill core 10, which is also the intersection point of the two chisel edges 12; where the main cutting edge 11 is formed by the intersection of the first relief surface 14 and the spiral groove 21, and the intersection of the first relief surface 14 and the spiral groove 21 also forms a main cutting edge rake angle 111 and a main cutting edge relief angle 112. The main cutting edge 11 is located at One side edge of the first relief surface 14, and one end of the main cutting edge 11 is connected with one end of the chisel edge 12, the chisel edge 12 is formed by the intersection of the first relief surface 14 and the chisel edge rake surface 13, and A chisel rake angle 121 and a chisel edge relief angle 122 are formed. Here, the chisel edge rake angle 121 is preferably a positive rake angle. In addition, the second relief surface 15 is located outside the chisel edge rake surface 13, that is, the first relief surface. The surface 14 and the second relief surface 15 are located on two sides of the chisel edge 12 , and the chisel edge rake surface 13 is located between the chisel edge 12 and the second relief surface 15 .

The above-mentioned cloud-shaped long drill also includes two parallel internal cooling holes 5 running through its two ends, these two internal cooling holes 5 are respectively parallel to the above-mentioned two spiral grooves 21, and these two internal cooling holes 5 start from the above-mentioned drill shank 4, and terminates on the above-mentioned two first flanks 14.

Using the above-mentioned cloud-shaped long drill for deep hole processing has the following characteristics:

In the embodiment of the present utility model, two main cutting edges 11, two chisel edges 12, two chisel edge rake surfaces 13, two first flank surfaces 14 and two second flank surfaces are arranged on the above-mentioned drill tip 1, which are center-symmetrical. 15, and the chisel rake angle 121 of the two chisel rake angle surfaces 13 is a positive rake angle, so that the sharpness and strength of the entire drill point 1 are effectively combined, its wear resistance is improved, and its service life is prolonged. The cost of use is reduced; at the same time, two main lands 23 and two secondary lands 24 are arranged alternately on the surface of the drill body 1, and through the cooperation of the main lands 23, secondary lands 24 and the spiral groove 21, not only reduces the The cutting resistance improves the processing efficiency, and also ensures the stability of cutting, thereby improving the quality of the processed hole; in addition, by setting two internal cooling holes 5 through both ends of the cloud-shaped long drill, it makes deep hole processing The chip removal is smoother, the processing environment of deep hole processing is improved, and the quality of the processed hole is improved.

In the embodiment of the present invention, the first flank 14 , the spiral groove 21 and the main land 23 intersect to form a tool point 20 , which is also the starting point of the main land 23 . Here, the width of the main land 23 is two-thirds of the land width of the standard drill, that is, the width of the main land 23 is 2f/3, and f is the land width of the standard drill. Certainly, according to actual conditions and requirements, in other embodiments of the present utility model, the above-mentioned main land 23 may also have other widths, which are not limited herein.

In the embodiment of the present utility model, the diameter of the outer circle where the main land 23 is located is greater than the diameter of the outer circle where the tooth back 22 is located, and the intersection of the main land 23 and the tooth back 22 is defined by the main land R fillet 230 The transition, in this way, forms an inverted cone structure, where the difference in diameter between the two outer circles ranges from 0.1 mm to 0.3 mm. Certainly, according to actual conditions and requirements, in other embodiments of the present invention, the difference between the diameters of the outer circle where the main land 23 is located and the outer circle where the tooth back 22 is located can also be in other ranges.

In the embodiment of the present utility model, the other side of the tooth back 22 is in contact with the secondary land 24, and the intersection is transitioned by the secondary land R fillet 240, and the secondary land 24 and the main land 23 are on the same cylindrical surface . Here, the width of the secondary margin 24 is 1/2 the width of the standard drill margin, that is, the width of the secondary margin 24 is f/2, where f is the standard drill margin width. Of course, according to actual conditions and needs, in other embodiments of the present utility model, the above-mentioned secondary land 24 may also have other widths, which are not limited herein.

In the embodiment of the present invention, a secondary margin chamfer 241 is provided between the secondary margin 24 and the spiral groove 21, and the edge of the secondary margin 24 intersects with the secondary margin chamfer 241. Here, The included angle θ between the secondary land chamfer surface 241 and the horizontal plane is 15-30°, and the included angle is the secondary land chamfer angle θ, that is, the chamfer range of the secondary land chamfer 240 is 15-30°. Of course, according to actual conditions and requirements, in other embodiments of the present invention, the secondary land chamfer 240 can also take other values, which are not limited here.

In summary, by designing the width of the main margin 23 to be 2f/3 and the width of the secondary margin 24 to be f/2, the inverted cone of the margin is 0.1mm-0.3mm, which is far larger than the inverted cone of the standard alloy drill In this way, the reduction of the margin width and the increase of the inverted cone greatly reduce the cutting resistance of the cloud-shaped long drill. In addition, the standard alloy drill has two margins, and the cloud-shaped long drill is designed as four margins. This ensures the smoothness of cutting, improves the quality of processed holes, and prolongs the service life of the cloud-shaped long drill.

In the embodiment of the present utility model, the above-mentioned helical groove 21 extends on the drill body 1, and its helix angle preferably ranges from 30° to 35°. Certainly, according to actual conditions and needs, in other embodiments of the present invention, the range of the helix angle of the above-mentioned helical groove 21 may also be other values, which are not limited here.

Further, in the embodiment of the present utility model, a water inlet groove 40 is opened on the rear end surface of the above-mentioned drill shank 4, and the water inlet groove 40 is symmetrical to the above-mentioned central axis a, and the tail ends of the above-mentioned two internal cooling holes 5 are located in the water inlet groove 40 and communicate with the water inlet groove 40, that is to say, the internal cooling holes 5 start at the bottom of the water inlet groove 40 and end at the first flank 14 above. Here, the two internal cooling holes 5 The distribution method is consistent with the distribution method of the above-mentioned spiral grooves 21 . Of course, according to actual conditions and requirements, in other embodiments of the present invention, the two internal cooling holes 5 may also adopt other distribution methods, which are not limited here.

In the embodiment of the present utility model, a drill neck 3 is provided between the above-mentioned drill handle 4 and the above-mentioned drill body 2 , and the two ends of the drill neck 3 are respectively connected with the drill handle 4 and the drill body 2 . The main function of the drill neck 3 is to increase the effective working length of the cloud-shaped long drill and improve the overall rigidity. Therefore, the length of the drill neck 3 is designed according to the depth of the required machining hole.

Taking the cloud-shaped long drill of Φ7mm as an example, the projection length of the two margins is 40mm, and the inverted cone is 0.3mm, that is, the diameter of the outer circle where the main margin 23 or the secondary margin 24 is minus the diameter of the outer circle where the tooth back 22 is 0.3 mm; the diameter of the drill neck 3 is the same as the diameter of the rear end (the diameter of the outer circle where the tooth back 22 is located), the outer circle of the drill neck 3 intersects the outer circle of the front end of the drill shank 4, and the diameter of the drill shank 4 is greater than the diameter of the drill neck 3 , transition by the front end chamfer 41 of the drill shank 4, the outer circle of the rear end of the drill shank 4 intersects the end face of the drill shank 4, and transition by the chamfer 42 of the drill shank rear end of the drill shank 4.

Based on the above technical solution, the cloud-shaped long drill adopts parallel drill cores, which greatly increase the chip space of the spiral groove 21, facilitate the discharge of drill chips, and improve the processing environment; double internal cooling spiral holes (inner Cooling hole 5) is the passage of cooling liquid, which can help drill chips to be discharged more smoothly when equipped with high-pressure cooling liquid, which reduces the cutting temperature, greatly improves the processing environment, and improves the quality of the processed hole.

The cloud-shaped long drill designed and manufactured by adopting the above-mentioned technical scheme has a projected shape of a curve, like a cloud, and is suitable for deep hole processing of various materials. In addition, after a large number of cutting verifications, in the processing of 20 to 30 times the diameter hole, the processing efficiency is increased by 5 to 8 times, the service life is increased by 2 to 10 times, and the quality of the processed hole is greatly improved.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (8)

1. The cloud-shaped long drill comprises a drill body, a drill shank located at one end of the drill body, and a drill tip located at the other end of the drill body, wherein the drill tip is provided with a centrally symmetrical Two main cutting edges, two chisel edges, two chisel edge rake faces, two first relief surfaces and two second relief surfaces, the main cutting edges are located on one side edge of the first relief surfaces, and the One end of the main cutting edge is connected to one end of the chisel edge, the first relief surface and the second relief surface are distributed on both sides of the chisel edge, and the chisel edge rake surface is located on the chisel edge Between the chisel rake surface and the second flank, the chisel rake angle of the chisel rake surface is a positive rake angle; The surface of the drill body is provided with two helical grooves and two tooth backs extending around its central axis. a belt and two secondary margins, the primary margins and the secondary margins are arranged alternately; The cloud-shaped long drill also includes two internal cooling holes running through its two ends, the two internal cooling holes are respectively parallel to the two spiral grooves, and the two internal cooling holes start from the rear end surface of the drill shank and end at the Two of the first flanks. 2. The cloud-shaped long drill according to claim 1, wherein the width of the main land is two-thirds of the width of the standard drill land. 3. The cloud-shaped long drill according to claim 2, wherein the diameter of the outer circle where the main land is located is greater than the diameter of the outer circle where the tooth back is located, and the difference between the two diameters ranges from 0.1 mm to 0.3 mm. mm. 4. The cloud-shaped long drill according to claim 2, wherein the width of the secondary margin is half of the width of the standard drill margin. 5. The cloud-shaped long drill as claimed in claim 4, characterized in that, a chamfered surface of a secondary land is provided between the secondary land and the spiral groove, and a chamfered surface of the secondary land is provided between the chamfered surface of the secondary land and the horizontal plane The included angle is 15-30°. 6. The cloud-shaped long drill according to any one of claims 1 to 5, characterized in that, the angle range of the helix angle of the helical groove is 30-35°. 7. The cloud-shaped long drill according to claim 6, wherein a water inlet groove is provided on the rear end surface of the drill shank, and the two internal cooling holes communicate with the water inlet groove. 8. The cloud-shaped long drill as claimed in claim 7, wherein a drill neck is provided between the drill shank and the drill body, and the two ends of the drill neck are connected to the drill shank and the drill neck respectively. The drill body is connected.