Multi-blade drill bit assembly for machining large deep holes

Abstract

The utility model discloses a multi-blade drill bit assembly for processing a large deep hole, which comprises a drill rod, a drill bit and blades, and the tail part of the drill rod is connected with a water inlet joint; a through hole is formed in the drill rod, a cooling water hole is formed in the drill bit and communicated with the through hole, and the through hole is communicated with the water inlet connector. A first mounting table and a second mounting table which protrude forwards are arranged at the front end of the drill bit, a first mounting groove, a second mounting groove, a third mounting groove and a fourth mounting groove are formed in the first mounting table and the second mounting table respectively, the mounting grooves are arranged at intervals in a staggered mode, and a blade is mounted in each mounting groove; groove faces are formed on the two sides of the first installation table and the second installation table, and cooling water holes are formed in the positions, close to the blade, of the groove faces and the positions, close to the blade, of the first installation table and the second installation table. Therefore, the original large blade is divided into the small blades, so that the stress of the blades is dispersed, the stress of each blade is reduced, the blades are not easy to damage, and the use cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial production accessory technology field especially, relate to a multi-blade drill bit assembly. BACKGROUND

[0002] In industrial production, drilling operation is often needed on workpieces, and drilling is completed by using a drill bit. When machining a deep hole with a large diameter (such as 150 mm) on a lathe, a small drill bit is usually used to drill a hole first, and then a reamer is used to expand the hole. Some very deep holes also need to be machined in sections, which is time-consuming and low in machining efficiency. If a large drill bit is used to drill a hole, a large length of blade is needed, and a deep hole with a large diameter can be drilled by cooperation of the left and right two groups of blades. However, when the size of the blade increases, the structural strength of the blade will decrease, and because the contact area with the workpiece increases, the stress on the blade will also increase, which will cause the blade to be more prone to breakage. In addition, the current replaceable blade drill bit is generally only simply installed against the convex part on the drill bit, which also increases the probability of the blade being buckled. Moreover, although some current drill bits are designed with a water cooling structure, the cooling water is only discharged through the cooling water hole to cool the blade, but it cannot help to discharge the debris generated during machining, and the accumulation of debris will affect the normal machining. SUMMARY

[0003] The utility model provides a multi-blade drill bit assembly with a more reasonable structure design, which is not easy to damage the blade, is beneficial to discharge debris, and is beneficial to machining a large deep hole.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme: a multi-blade drill bit assembly for machining a large deep hole, comprising a drill rod, a drill bit, and a blade, the drill bit is installed at the front end of the drill rod, the blade is installed on the drill bit, and a water inlet joint is connected to the tail of the drill rod; a through hole is arranged in the drill rod, a cooling water hole is arranged in the drill bit, the cooling water hole is communicated with the through hole, the through hole is communicated with the water inlet joint, and cooling water is connected through the water inlet joint; a first installation table and a second installation table are arranged at the front end of the drill bit and protrude forward and outward; a first installation groove and a second installation groove are arranged on the first installation table, and the first installation groove and the second installation groove are arranged at intervals; a third installation groove and a fourth installation groove are arranged on the second installation table, and the third installation groove and the fourth installation groove are arranged at intervals; the first installation groove, the second installation groove, the third installation groove, and the fourth installation groove are arranged at intervals, and a blade is installed in each installation groove; a groove surface is formed inward on both sides of the first installation table and the second installation table, and a cooling water hole is arranged at a position close to the blade on the groove surface and at a position close to the blade on the first installation table and the second installation table.

[0005] Further, the first and second installation grooves are opened along the front side wall of the first installation platform, and the third and fourth installation grooves are opened along the front side wall of the second installation platform.

[0006] Further, each installation groove is a concave groove gradually shrinking inward, and each blade is a wedge-shaped structure corresponding to the shape of the installation groove, and the blade is installed in the corresponding installation groove by screwing a screw from the front face of the blade.

[0007] Further, a water inlet cavity is arranged in the central area of the tail of the drill bit, each cooling water hole is communicated to the water inlet cavity, and the front end of the through hole in the drill rod is butted against the water inlet cavity.

[0008] Further, a sealing groove is arranged around the through hole at the front end of the drill rod, and a sealing ring is embedded in the sealing groove and pressed against the edge of the water inlet cavity to form a sealing structure between the drill rod and the drill bit.

[0009] Further, a mounting seat is arranged at the tail end of the drill rod, and a water inlet connector is arranged on the mounting seat, and the whole drill bit assembly is mounted on the tool holder of the lathe through the mounting seat.

[0010] Further, at least one cooling water hole is arranged at the position close to the first and second installation grooves on the first installation platform and at the position close to the third and fourth installation grooves on the second installation platform.

[0011] Further, the circumferences of the two blades on the first installation platform cover the empty gaps on both sides of the two blades on the second installation platform, and the circumferences of the two blades on the second installation platform cover the empty gaps on both sides of the two blades on the first installation platform, and the drilling hole diameter formed by the blades is not less than 150 mm.

[0012] As a preferred, the drill bit is fixed at the front end of the drill rod by at least two bolts to form a detachable structure, so that different types of drill bits can be quickly replaced.

[0013] The utility model discloses a drill bit with four blades installed in the drill bit in the way of interval staggered, which can not only achieve the purpose of drilling large-diameter deep holes with large blades, but also can reduce the force of each blade by dividing the original large blade into small blades, so that the blades are not easy to be damaged due to excessive force. Even if the blades are damaged, only the damaged blades need to be replaced, instead of replacing the whole large blade, which can reduce the cost of replacing the blades. At the same time, the blades are installed in the recesses on the installation platform in a half-enclosed state, which can provide more comprehensive protection for the blades and further reduce the probability of damage. In addition, the cooling water holes arranged on the front face of the blades can not only cool the processed debris, but also make the size of the debris smaller and easier to be washed away by the cooling water, which is beneficial to the discharge of the debris. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a whole structural drawing of the utility model;

[0015] Figure 2 is a sectional structural drawing of the utility model;

[0016] Figure 3 is a structural drawing of the drill bit assembly of the utility model;

[0017] Figure 4 is a structural drawing of the drill bit assembly of the utility model from another angle;

[0018] Figure 5 is a plane schematic drawing of the drill bit assembly of the utility model;

[0019] Figure 6 is a three-dimensional structural drawing of the drill bit of the utility model.

[0020] In the drawing, 1 is a drill rod, 11 is a through hole, 2 is a drill bit, 20 is a groove surface, 21 is a first mounting table, 22 is a second mounting table, 23 is a first mounting groove, 24 is a second mounting groove, 25 is a third mounting groove, 26 is a fourth mounting groove, 27 is a water inlet cavity, 28 is a cooling water hole, 3 is a blade, 4 is a mounting seat, 5 is a water inlet joint, and 6 is a sealing ring. DETAILED DESCRIPTION

[0021] In this embodiment, reference is made to Figures 1-6The multi-blade drill bit assembly for machining large deep holes comprises a drill rod 1, a drill bit 2 and blades 3. The drill bit 2 is installed at the front end of the drill rod 1, the blades 3 are installed on the drill bit 2, and the tail end of the drill rod 1 is connected with a water inlet joint 5. A through hole 11 is arranged in the drill rod 1, a cooling water hole 28 is arranged in the drill bit 2, the cooling water hole 28 is communicated with the through hole 11, the through hole 11 is communicated with the water inlet joint 5, and cooling water (or other cooling medium) is connected through the water inlet joint 5. A first mounting table 21 and a second mounting table 22 are arranged at the front end of the drill bit 2, which protrude forward and incline outward (i.e. form a pointed structure). A first mounting groove 23 and a second mounting groove 24 are arranged on the first mounting table 21, and the first mounting groove 23 and the second mounting groove 24 are arranged at intervals. A third mounting groove 25 and a fourth mounting groove 26 are arranged on the second mounting table 22, and the third mounting groove 25 and the fourth mounting groove 26 are arranged at intervals. The first mounting groove 23, the second mounting groove 24, the third mounting groove 25 and the fourth mounting groove 26 are arranged in a staggered manner, and each mounting groove is provided with a blade 3. Thus, the four blades 3 are arranged on different circumferences. A groove surface 20 is formed on both sides of the first mounting table 21 and the second mounting table 22, which is concave inward and used for accommodating the debris generated during drilling. Cooling water holes 28 are arranged on the groove surface 20 near the blades 3 and the first mounting table 21 and the second mounting table 22 near the blades 3. Thus, the cutting part and the debris can be cooled and flushed at the same time, so that the debris can be discharged as soon as possible.

[0022] The first mounting groove 23 and the second mounting groove 24 are arranged along the front side wall of the first mounting table 21, and the third mounting groove 25 and the fourth mounting groove 26 are arranged along the front side wall of the second mounting table 22. In this embodiment, the clockwise rotation of the drill bit 2 is taken as an example to determine the front and back directions.

[0023] Each mounting groove is a groove that gradually contracts inward, and each blade 3 is a wedge-shaped structure corresponding to the shape of the mounting groove. Thus, the blade 3 can be smoothly installed in the mounting groove. Screws are screwed into the front of the blade 3 to install the blade 3 in the corresponding mounting groove, so that the blade 3 can be quickly disassembled and installed, and the blade 3 can be quickly replaced.

[0024] A water inlet cavity 27 is arranged at the tail end center of the drill bit 2, and each cooling water hole 28 is communicated with the water inlet cavity 27. The front end of the through hole 11 in the drill rod 1 is butted against the water inlet cavity 27.

[0025] A sealing groove is arranged at the front end of the drill rod 1, which surrounds the through hole 11. A sealing ring 6 is embedded in the sealing groove, which is pressed against the edge of the water inlet cavity 27 to form a sealing structure between the drill rod 1 and the drill bit 2.

[0026] A mounting seat 4 is arranged at the tail end of the drill rod 1, and the water inlet joint 5 is arranged on the mounting seat 4. The entire drill bit assembly is installed on the tool holder of the lathe through the mounting seat 4.

[0027] At least one cooling water hole 28 is arranged on the first mounting platform 21 near the first mounting slot 23 and the second mounting slot 24 and on the second mounting platform 22 near the third mounting slot 25 and the fourth mounting slot 26, respectively, to play a cooling role on the adjacent blades 3. The cooling water enters the through hole 11 of the drill rod 1 through the water inlet joint 5, and then enters the cooling water hole 28 through the water inlet cavity 27.

[0028] The circumferences of the two blades 3 on the first mounting platform 21 cover the empty gaps on both sides of the two blades on the second mounting platform 22 (i.e. the positions without blades 3), and the circumferences of the two blades 3 on the second mounting platform 22 cover the empty gaps on both sides of the two blades 3 on the first mounting platform 21. In this way, four small-size blades 3 that are independent of each other can replace two large-size blades to cover a large deep hole with a size not less than 150 mm, and the cutting layer is broken and the cutting force is reduced through the staggered arrangement of the blades 3, so that the blades 3 are not easily damaged.

[0029] The drill bit 2 is fixed to the front end of the drill rod 1 by at least two bolts to form a detachable structure, so that different types of drill bits can be quickly replaced.

[0030] The above has made a detailed description of the present application, the above is only a preferred embodiment of the present application, which cannot limit the scope of the present application, that is, any equivalent changes and modifications made within the scope of the present application should still fall within the scope of the present application.

Claims

1. A multi-blade drill bit assembly for machining large deep holes, comprising a drill rod, a drill bit, and cutting blades, wherein the drill bit is mounted on the front end of the drill rod, the cutting blades are mounted on the drill bit, and a water inlet connector is connected to the tail end of the drill rod; a through hole is provided in the drill rod, and a cooling water hole is provided in the drill bit, the cooling water hole communicating with the through hole, and the through hole communicating with the water inlet connector, through which cooling water is introduced, characterized in that: The first mounting table and the second mounting table are protruded forward and inclined outward, the first mounting table is provided with a first mounting groove and a second mounting groove, and the first mounting groove and the second mounting groove are arranged at intervals; the second mounting table is provided with a third mounting groove and a fourth mounting groove, and the third mounting groove and the fourth mounting groove are arranged at intervals; the first mounting groove, the second mounting groove, the third mounting groove and the fourth mounting groove are arranged at intervals, and each mounting groove is provided with a blade; the first mounting table and the second mounting table are provided with a groove face which is recessed inward, and the groove face is provided with a cooling water hole near the blade.

2. The multi-blade drill bit assembly for machining large deep holes according to claim 1, characterized in that: The first mounting groove and the second mounting groove are arranged along the front side wall of the first mounting table, and the third mounting groove and the fourth mounting groove are arranged along the front side wall of the second mounting table.

3. The multi-blade drill bit assembly for machining large deep holes according to claim 1 or 2, characterized in that: Each mounting groove is a groove which is gradually contracted inward, and each blade is a wedge-shaped structure corresponding to the shape of the mounting groove, and the blade is screwed into the corresponding mounting groove from the front face of the blade.

4. The multi-blade drill bit assembly for machining large deep holes of claim 1, wherein: The drill bit is provided with a water inlet cavity in the center area of the tail part, each cooling water hole is communicated to the water inlet cavity, and the front end of the through hole in the drill rod is connected to the water inlet cavity.

5. The multi-blade drill bit assembly for machining large deep holes according to claim 4, wherein: The drill rod is provided with a sealing groove at the front end, the sealing groove surrounds the through hole, and a sealing ring is embedded in the sealing groove and tightly pressed on the edge of the water inlet cavity to form a sealing structure between the drill rod and the drill bit.

6. The multi-blade drill bit assembly for machining large deep holes of claim 1, wherein: The drill rod is provided with a mounting seat at the tail end, and the water inlet connector is arranged on the mounting seat, and the whole drill bit assembly is mounted on the tool rest of the lathe through the mounting seat.

7. The multi-blade drill bit assembly for machining large deep holes of claim 1, wherein: The first mounting table is provided with at least one cooling water hole near the first mounting groove and the second mounting groove, and the second mounting table is provided with at least one cooling water hole near the third mounting groove and the fourth mounting groove.

8. The multi-blade drill bit assembly for machining large deep holes of claim 1, wherein: The circumferences of the two blades on the first mounting table cover the empty gaps on both sides of the two blades on the second mounting table, the circumferences of the two blades on the second mounting table cover the empty gaps on both sides of the two blades on the first mounting table, and the drilling hole diameter formed by the blades is not less than 150mm.

9. The multi-blade drill bit assembly for machining large deep holes of claim 1, wherein: The drill bit is fixed on the front end of the drill rod by at least two bolts to form a detachable structure.

Images