Deep hole drill bit

Abstract

The deep hole drill bit comprises a drill handle, a drill body and drill tips, the outer wall of the drill body is provided with a plurality of cutting bosses extending from the drill tips to the drill handle, a chip groove is formed between every two adjacent cutting bosses, the ends, located at the drill tips, of the cutting bosses are provided with cutting edges, and each cutting edge comprises a base. A plurality of prismatic table-shaped first cutting blocks and a plurality of prismatic table-shaped second cutting blocks are arranged on the base, the height of the first cutting blocks is higher than that of the second cutting blocks, the first cutting blocks and the second cutting blocks are alternately arranged, and a gap is formed between each first cutting block and the adjacent second cutting block. According to the invention, the cutting edge at the drill tip is improved, and the original integral cutting edge with a regular shape is changed into an uneven discontinuous shape, so that when the cutting edge is used for cutting, obtained cuttings are discontinuous, namely the width of the cuttings is reduced, the cuttings are easier to break, the volume is also reduced, and the cuttings are easier to be discharged through the chip groove; therefore, the risk of blockage of the chip groove is reduced.

Description

Technical Field

[0001] The invention belongs to the field of cutting tools, in particular to a deep hole drill. Background Art

[0002] Deep hole drills are used for deep hole processing. At present, the difficulties in deep hole processing are: 1. The temperature of the drill bit rises during the drilling process and it is difficult to cool down, resulting in lower strength of the drill bit and lower drilling efficiency; 2. Due to the large depth of the hole, it is difficult to discharge the internal chips, and the chip removal groove of the drill bit is easily blocked; 3. The drill bit is too long and easily deformed, resulting in a large coaxiality error of the hole.

[0003] CN201310083911.0 discloses a deep hole double-helix internal cooling drill, and CN202011517042.4 discloses a gun drill structure that is beneficial to improving the cooling effect when processing deep holes. A cooling channel is set inside the drill bit. When drilling, the coolant flows along the cooling channel to the cutting edge, then enters the chip groove, and finally flows outward along the chip groove, thereby achieving cooling and discharging the chip slope at the same time.

[0004] Although this drill has a good cooling effect and can promote chip removal, the chips cut by this drill are relatively wide and are still easily blocked in the chip groove. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a deep hole drill which can reduce the risk of chips clogging the chip removal groove and reduce the difficulty of chip removal.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is: a deep hole drill bit, comprising a drill shank, a drill body and a drill tip, wherein the outer wall of the drill body is provided with cutting bosses extending from a plurality of drill tips to the drill shank, a chip removal groove is provided between two adjacent cutting bosses, and a cutting edge is provided at one end of the cutting boss located at the drill tip,

[0007] The cutting edge includes a base, on which are arranged a plurality of first prism-shaped cutting blocks and a plurality of second prism-shaped cutting blocks. The height of the first cutting blocks is higher than that of the second cutting blocks, and the first cutting blocks and the second cutting blocks are alternately arranged, with a spacing between the first cutting blocks and adjacent second cutting blocks.

[0008] Furthermore, the base, the first cutting block and the second cutting block are integrally formed.

[0009] Furthermore, a support sleeve is fixedly arranged on the outer wall of the drill body, and the cutting boss includes a first cutting boss and a second cutting boss, and the first cutting boss and the second cutting boss are respectively located on both sides of the support sleeve; a connecting groove is arranged on the inner wall of the support sleeve axially penetrating the support sleeve, and the chip removal grooves on both sides of the support sleeve are connected by the connecting groove;

[0010] The outer diameter of the support sleeve is consistent with the outer diameter of the cutting boss; the outer wall of the support sleeve is provided with a plurality of accommodating grooves, each of the accommodating grooves is provided with a movable piece, the bottom of the accommodating groove is provided with a mounting hole, a spring is provided in the mounting hole, the end of the movable piece facing the drill tip is hinged to the accommodating groove, and the middle part of the movable piece is fixedly connected to the spring; the movable piece is arc-shaped, and when the movable piece is completely in the accommodating groove, the outer wall of the movable piece and the outer wall of the support sleeve are located on the same cylindrical surface.

[0011] Furthermore, the outer walls of the support sleeve and the movable sheet are provided with lubrication grooves, and an elastic oil storage layer is provided in the lubrication grooves.

[0012] Furthermore, there are four cutting bosses, which are evenly distributed around the drill body.

[0013] Furthermore, the first cutting boss is located between the support sleeve and the drill tip; the first cutting boss includes a pair of first movable cutting bosses and a pair of first fixed cutting bosses, the second cutting boss includes a pair of second movable cutting bosses and a pair of second fixed cutting bosses, the first movable cutting boss is connected to the second movable cutting boss via a connecting section that passes through the support sleeve; the outer wall of the drill body is provided with an axially extending slide groove, the first movable cutting boss and the second movable cutting boss are located in the slide groove and slideably cooperate with the slide groove; the second movable cutting boss is located at one end of the drill shank and is provided with an adjustment mechanism for controlling the axial position of the first movable cutting boss and the second movable cutting boss; when drilling, the axial positions of the first movable cutting boss and the second movable cutting boss are adjusted at regular intervals so that the cutting edges of the first movable cutting boss and the first fixed cutting boss drill holes alternately.

[0014] Furthermore, the adjustment mechanism includes a sliding sleeve arranged on the drill body, the outer wall of the drill body is provided with a first cutting position screw hole and a second cutting position screw hole, the sliding sleeve is provided with a positioning screw, and the positioning screw is arranged inside the first cutting position screw hole or the second cutting position screw hole.

[0015] Furthermore, a cooling channel extending to the drill tip is provided inside the drill body, a liquid inlet is provided on the drill shank, one end of the cooling channel is connected to the liquid inlet, and the other end is connected to the chip removal groove.

[0016] The beneficial effect of the present invention is as follows: the present invention improves the cutting edge at the drill tip, changing the original regular integral cutting edge into an uneven discontinuous shape. When the cutting edge is cutting, the chips obtained are also discontinuous, that is, the width of the chips is reduced, the chips are easier to break, the volume is also reduced, and it is easier to discharge through the chip groove, thereby reducing the risk of chip groove clogging.

[0017] The invention is suitable for deep hole processing with a hole diameter of more than 30 mm and a depth of more than 400 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall front and cross-sectional view of the deep hole drill bit of the present invention;

[0019] Figure 2 yes Figure 1 A magnified schematic diagram of part A;

[0020] Figure 3 yes Figure 1 A magnified schematic diagram of part B;

[0021] Figure 4 Yes Yes Figure 3 Schematic diagram of the cross section of the middle CC;

[0022] Figure 5 yes Figure 1 Schematic diagram of the middle EE section;

[0023] Figure 6 yes Figure 1 Schematic diagram of the middle FF section;

[0024] Figure 7 yes Figure 1 The enlarged schematic diagram of the D part;

[0025] Figure markings: 1—drill shank; 11—sleeve; 12—first cutting position screw hole; 13—second cutting position screw hole; 14—positioning screw; 2—drill body; 22—support sleeve; 23—connecting groove; 24—accommodating groove; 25—movable sheet; 26—mounting hole; 27—spring; 28—elastic oil reservoir; 212—cooling channel; 213—liquid inlet; 3—drill tip; 4—cutting boss; 41—cutting edge; 411—base; 412—first cutting block; 413—second cutting block; 414—second cutting block; 42—first cutting boss; 421—first movable cutting boss; 422—first fixed cutting boss; 423—connecting section; 43—second cutting boss; 431—second movable cutting boss; 432—second fixed cutting boss; 5—chip groove. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0027] The deep hole drill bit of the present invention is as follows Figures 1 to 7 As shown, it includes a drill shank 1, a drill body 2 and a drill tip 3. The outer wall of the drill body 2 is provided with a cutting boss 4 extending from multiple drill tips 3 to the drill shank 1, a chip groove 5 is provided between two adjacent cutting bosses 4, and the cutting boss 4 is located at one end of the drill tip 3 and is provided with a cutting edge 41.

[0028] The drill handle 1 is used to connect with the main shaft of the drilling equipment, the drill body 2 is the main body of the drill bit, and the drill tip 3 is the front end of the drill body 2. The cutting boss 4 is used to cut the parts to complete the drilling process. The cutting edge 41 is used to contact the bottom of the hole to be processed and plays the main role in drilling. The cutting boss 4 in the remaining parts plays the role of auxiliary positioning and improving stability.

[0029] The conventional cutting edge 41 is an integral cutting edge with a relatively regular shape. The chips cut off are continuous, relatively wide, and large in volume, and are not easy to discharge. The risk of clogging the chip groove 5 is high.

[0030] In the present invention, Figure 2 As shown, the cutting edge 41 includes a base 411, on which a plurality of first prism-shaped cutting blocks 412 and a plurality of second prism-shaped cutting blocks 413 are arranged. The height of the first cutting blocks 412 is higher than the height of the second cutting blocks 413, and the first cutting blocks 412 and the second cutting blocks 413 are alternately arranged, and there is a spacing 414 between the first cutting blocks 412 and the adjacent second cutting blocks 413.

[0031] In the present invention, a first cutting block 412 and a second cutting block 413 of different heights are arranged on a base 411, and a spacing 414 is provided between the first cutting block 412 and the adjacent second cutting block 413. The first cutting block 412 and the second cutting block 413 are not continuous, and the cut chips are also discontinuous. Therefore, the width of the chips is smaller, the chips are easier to break, the volume is also reduced, and it is easier to be discharged through the chip groove, thereby reducing the risk of chip groove clogging.

[0032] The base 411, the first cutting block 412 and the second cutting block 413 are integrally formed with high overall strength. The base 411, the first cutting block 412 and the second cutting block 413 are made of wear-resistant materials to increase service life and ensure drilling accuracy.

[0033] When drilling deep holes, the drill bit itself is long and easy to deform, resulting in low processing accuracy, and the drill bit has poor stability and is easy to break. In order to improve the stability of the drill bit during drilling, such as Figure 1 , Figure 3 and Figure 4 As shown, the present invention has a cylindrical support sleeve 22 fixedly disposed on the outer wall of the drill body 2, and the support sleeve 22 is located in the middle of the drill body 2. The cutting boss 4 includes a first cutting boss 42 and a second cutting boss 43, and the first cutting boss 42 and the second cutting boss 43 are respectively located on both sides of the support sleeve 22. The inner wall of the support sleeve 22 is provided with a connecting groove 23 axially penetrating the support sleeve 22, and the chip removal grooves 5 on both sides of the support sleeve 22 are connected by the connecting groove 23, which does not affect normal chip removal.

[0034] The outer diameter of the support sleeve 22 is consistent with the outer diameter of the cutting boss 4, that is, the outer diameter of the support sleeve 22 is adapted to the diameter of the deep hole drilled by the drill bit, and the outer wall of the support sleeve 22 can fit the inner wall of the deep hole. The outer wall of the support sleeve 22 is provided with a plurality of receiving grooves 24, and the number of receiving grooves 24 can be 4. A movable piece 25 is provided in each receiving groove 24, and a through hole 26 extending to the bearing 21 is provided at the bottom of the receiving groove 24, and a spring 27 is provided in the through hole 26. The end of the movable piece 25 facing the drill tip 3 is hinged to the receiving groove 24, and the middle part of the movable piece 25 is fixedly connected to the spring 27; the movable piece 25 is arc-shaped, and when the movable piece 25 is completely in the receiving groove 24, the outer wall of the movable piece 25 and the outer wall of the support sleeve 22 are located on the same cylindrical surface.

[0035] When the drilling depth is small, the support sleeve 22 is located outside the hole, and the spring 27 is at a normal length. At this time, the movable piece 25 is in an inclined state, and the main body is located outside the receiving groove 24. When the drilling reaches a certain depth and the support sleeve 22 begins to enter the drilled hole, the orifice squeezes the movable piece 25, pushing the movable piece 25 to rotate toward the receiving groove 24, and the spring 27 is compressed to generate elastic force, which is transmitted to the movable piece 25, prompting the movable piece 25 to stick to the inner wall of the drilled hole. At this time, the movable piece 25 and the support sleeve 22 can support and position the drill body 2, improve the stability of the drill body 2, prevent the drill body 2 from deformation, and ensure the accuracy of the drilling. After the drilling is completed, the drill bit withdraws from the drilled hole, the spring 27 stretches and resets, and the movable piece 25 rotates to the outside of the receiving groove 24 again.

[0036] The support sleeve 22 and the movable sheet 25 rotate with the drill body 2, and there is friction between them and the inner wall of the hole, which increases the drilling resistance. In order to reduce the friction force, the present invention is provided with a lubrication groove on the outer wall of the support sleeve 22 and the movable sheet 25, and an elastic oil storage layer 28 is provided in the lubrication groove. The elastic oil storage layer 28 can be a common flexible liquid-absorbing material such as a sponge, which can absorb and store a certain amount of lubricating oil. The volume of the elastic oil storage layer 28 in a loose state is larger than the volume of the lubrication groove, so that part of the elastic oil storage layer 28 extends out of the lubrication groove. When the support sleeve 22 and the movable sheet 25 enter the hole, the elastic oil storage layer 28 contacts the hole wall and is squeezed, and the lubricating oil absorbed by it is squeezed out and adheres to the hole wall, which plays a role in lubrication and reducing friction resistance.

[0037] In the present invention, there are four cutting bosses 4, which are evenly distributed around the drill body 2. In addition, there may be two or three cutting bosses 4. The cutting bosses 4 may be in a conventional spiral shape or in a linear shape.

[0038] When drilling, the cutting edge 41 is subjected to the greatest cutting force, generates heat the fastest, and is also the part most susceptible to wear. In order to slow down the wear of the cutting edge 41, ensure that the cutting edge 41 is fully cooled, and increase the service life of the cutting edge 41, in the present invention, Figure 1 , Figure 3, Figure 4 , Figure 5 and Figure 6 As shown, the first cutting boss 42 is located between the support sleeve 22 and the drill tip 3; the first cutting boss 42 includes a pair of first movable cutting bosses 421 and a pair of first fixed cutting bosses 422, and the second cutting boss 43 includes a pair of second movable cutting bosses 431 and a pair of second fixed cutting bosses 432. The first movable cutting boss 421 is connected to the second movable cutting boss 431 through a connecting section 423 that penetrates the support sleeve 22, and the first fixed cutting boss 422 and the second fixed cutting boss 432 are fixedly mounted on the drill body 2. The outer wall of the drill body 2 is provided with an axially extending slide groove, which can be a dovetail groove. The first movable cutting boss 421 and the second movable cutting boss 431 are located in the slide groove and slide with the slide groove, so that the first movable cutting boss 421 and the second movable cutting boss 431 can slide along the slide groove to adjust the axial position. The second movable cutting boss 431 is located at one end of the drill handle 1 and is provided with an adjustment mechanism for controlling the axial position of the first movable cutting boss 421 and the second movable cutting boss 431. When drilling, the axial positions of the first movable cutting boss 421 and the second movable cutting boss 431 are adjusted at regular intervals, so that the cutting edges 41 of the first movable cutting boss 421 and the first fixed cutting boss 422 drill holes alternately. Specifically, the adjusting mechanism can be used to first drive the first movable cutting boss 421 and the second movable cutting boss 431 to slide toward the direction of the drill handle 1, so that the cutting edge 41 of the first movable cutting boss 421 is located behind the cutting edge 41 of the first fixed cutting boss 422. At this time, the cutting edge 41 of the first fixed cutting boss 422 is drilling, while the cutting edge 41 of the first movable cutting boss 421 is in a resting state; after a period of time, the drilling is suspended, and the drilling equipment drives the drill bit to move outward as a whole by an appropriate distance, and uses the adjusting mechanism to drive the first movable cutting boss 421 and the second movable cutting boss 431 to slide toward the direction of the drill tip 3, so that the cutting edge 41 of the first movable cutting boss 421 is located in front of the cutting edge 41 of the first fixed cutting boss 422. At this time, the cutting edge 41 of the first movable cutting boss 421 contacts the bottom of the hole and continues to drill, while the cutting edge 41 of the first fixed cutting boss 422 does not contact the bottom of the hole, but is in a resting state. In the present invention, the two cutting bosses 4 are divided into two pairs. The two pairs of cutting bosses 4 perform drilling and resting in turn, which can effectively prevent the cutting edge 41 from overheating and reducing its strength, thereby increasing the working life of the cutting edge 41.

[0039] In the present invention, the regulating mechanism is as follows Figure 7As shown, it includes a sleeve 11 arranged on the drill body 2, and the second movable cutting boss 431 is fixedly connected to the sleeve 11; the outer wall of the drill body 2 is provided with a first cutting position screw hole 12 and a second cutting position screw hole 13, and a positioning screw 14 is provided on the sleeve 11, and the positioning screw 14 is arranged inside the first cutting position screw hole 12 or the second cutting position screw hole 13. When the positioning screw 14 cooperates with the first cutting position screw hole 12, the cutting edge 41 of the first fixed cutting boss 422 works, and when the positioning screw 14 cooperates with the second cutting position screw hole 13, the cutting edge 41 of the first movable cutting boss 421 works.

[0040] A cooling channel 212 extending to the drill tip 3 is provided inside the drill body 2, and a liquid inlet 213 is provided on the drill shank 1. One end of the cooling channel 212 is connected to the liquid inlet 213, and the other end is connected to the chip groove 5. When drilling, the coolant is introduced into the cooling channel 212 through the liquid inlet 213, and the coolant flows to the drill tip 3 and enters the chip groove 5 through the cooling channel 212, and finally is discharged along the chip groove 5, so as to cool the cutting edge 41 and promote chip removal.

[0041] The invention is suitable for deep hole processing with a hole diameter of more than 30 mm and a depth of more than 400 mm.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A deep hole drill, comprising a drill shank (1), a drill body (2) and a drill tip (3), wherein the outer wall of the drill body (2) is provided with a cutting boss (4) extending from a plurality of drill tips (3) to the drill shank (1), a chip removal groove (5) is provided between two adjacent cutting bosses (4), and a cutting edge (41) is provided at one end of the cutting boss (4) located at the drill tip (3), characterized in that: The cutting edge (41) comprises a base (411), on which a plurality of first cutting blocks (412) in the shape of a prism and a plurality of second cutting blocks (413) in the shape of a prism are arranged, the height of the first cutting blocks (412) being higher than the height of the second cutting blocks (413), the first cutting blocks (412) and the second cutting blocks (413) being arranged alternately, and a spacing (414) being provided between the first cutting blocks (412) and the adjacent second cutting blocks (413).

2. The deep hole drill bit according to claim 1, characterized in that: The base (411), the first cutting block (412) and the second cutting block (413) are integrally formed.

3. The deep hole drill bit according to claim 1, characterized in that: The outer wall of the drill body (2) is fixedly provided with a support sleeve (22); the cutting boss (4) comprises a first cutting boss (42) and a second cutting boss (43); the first cutting boss (42) and the second cutting boss (43) are respectively located on two sides of the support sleeve (22); the inner wall of the support sleeve (22) is provided with a connecting groove (23) axially penetrating the support sleeve (22); the chip removal grooves (5) on both sides of the support sleeve (22) are connected by the connecting groove (23); The outer diameter of the support sleeve (22) is consistent with the outer diameter of the cutting boss (4); the outer wall of the support sleeve (22) is provided with a plurality of accommodating grooves (24), each of which is provided with a movable piece (25); the bottom of the accommodating groove (24) is provided with a mounting hole (26), a spring (27) is provided in the mounting hole (26); one end of the movable piece (25) facing the drill tip (3) is hinged to the accommodating groove (24), and the middle part of the movable piece (25) is fixedly connected to the spring (27); the movable piece (25) is arc-shaped, and when the movable piece (25) is completely in the accommodating groove (24), the outer wall of the movable piece (25) and the outer wall of the support sleeve (22) are located on the same cylindrical surface.

4. The deep hole drill bit according to claim 3, characterized in that: The outer walls of the support sleeve (22) and the movable sheet (25) are provided with lubrication grooves, and an elastic oil storage layer (28) is provided in the lubrication grooves.

5. The deep hole drill bit according to claim 3, characterized in that: There are four cutting bosses (4) which are evenly distributed around the drill body (2).

6. The deep hole drill bit according to claim 5, characterized in that: The first cutting boss (42) is located between the support sleeve (22) and the drill tip (3); the first cutting boss (42) includes a pair of first movable cutting bosses (421) and a pair of first fixed cutting bosses (422); the second cutting boss (43) includes a pair of second movable cutting bosses (431) and a pair of second fixed cutting bosses (432); the first movable cutting boss (421) is connected to the second movable cutting boss (431) via a connecting section (423) that passes through the support sleeve (22); the outer wall of the drill body (2) is provided with an axially extending sliding groove, The first movable cutting boss (421) and the second movable cutting boss (431) are located in the slide groove and slidably cooperate with the slide groove; the second movable cutting boss (431) is located at one end of the drill handle (1) and is provided with an adjustment mechanism for controlling the axial position of the first movable cutting boss (421) and the second movable cutting boss (431); when drilling, the axial position of the first movable cutting boss (421) and the second movable cutting boss (431) is adjusted at regular intervals so that the cutting edges (41) of the first movable cutting boss (421) and the first fixed cutting boss (422) drill holes alternately.

7. The deep hole drill bit according to claim 6, characterized in that: The adjustment mechanism comprises a sleeve (11) arranged on the drill body (2), and the second movable cutting boss (431) is fixedly connected to the sleeve (11); the outer wall of the drill body (2) is provided with a first cutting position screw hole (12) and a second cutting position screw hole (13), and the sleeve (11) is provided with a positioning screw (14), and the positioning screw (14) is arranged inside the first cutting position screw hole (12) or the second cutting position screw hole (13).

8. The deep hole drill according to any one of claims 1 to 7, characterized in that: The drill body (2) is provided with a cooling channel (212) extending to the drill tip (3), the drill shank (1) is provided with a liquid inlet (213), one end of the cooling channel (212) is connected to the liquid inlet (213), and the other end is connected to the chip removal groove (5).

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