Quick-changing brazed drill

Abstract

A quick-changing brazed drill includes a drill body and a quick-changing joint. The drill body is connected to the quick-changing joint detachably, and a vent hole is provided at a connection point between the drill body and the quick-changing joint. The drill body has a cylindrical structure, an interior of a front end of the drill body is hollow, and an outer side of the front end of the drill body is provided with 2-6 grooves. The quick-changing joint includes a transition block and a rear cover; a rear end of the transition block is connected to the rear cover by an external thread; a snap-fit area is provided between the transition block and the rear cover; a middle portion of the transition block is provided with a first threaded hole and is connected to a rear end of the drill body.

Claims

1. A quick-changing brazed drill, comprising: a drill body, and a quick-changing joint; wherein the drill body is connected to the quick-changing joint detachably, and a vent hole is provided at a connection point between the drill body and the quick-changing joint, wherein the drill body has a cylindrical structure, an interior of a front end of the drill body is hollow, and an outer side of the front end of the drill body is provided with 2-6 grooves; wherein the quick-changing joint comprises a transition block and a rear cover; a rear end of the transition block is connected to the rear cover by an external thread; a snap-fit area is provided between the transition block and the rear cover; a middle portion of the transition block is provided with a first threaded hole and is connected to a rear end of the drill body; the vent hole is configured at a rear end of the first threaded hole, and a diameter of the vent hole is smaller than a diameter of the first threaded hole; a central portion of the rear cover is provided with a spline hole; the vent hole, the first threaded hole and the spline hole are arranged on a same axis; and the external thread and a thread inside the first threaded hole are right-handed threads.

2. The quick-changing brazed drill according to claim 1, wherein two symmetrical first clamping surfaces are arranged in a middle portion of a side surface of the drill body.

3. The quick-changing brazed drill according to claim 1, wherein a side surface of the transition block of the quick-changing joint is provided with two symmetrical second clamping surfaces.

4. The quick-changing brazed drill according to claim 1, wherein a diameter of the drill body is 5-20 mm.

5. The quick-changing brazed drill according to claim 1, wherein a diameter of the spline hole is 5-40 mm.

6. A manufacturing process of the quick-changing brazed drill according to claim 3, comprising the following steps: (1) processing a drill base, a joint and a rear cover; (2) adjusting an adhesive, and dispensing the adhesive on the drill base; (3) dispensing a diamond on the drill base, dispensing a solder on a drill bit base; and a weight ratio of the solder is: Ni (84%), Fe (4%), Cr (9%), Ti (3%); (4) vacuum brazing and sintering a drill; (5) punching the rear cover; (6) assembling the drill, the joint and the rear cover; (7) performing an overall sandblasting and a painting; and (8) laser marking and packaging.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is an exploded view of a first embodiment of the present invention.

(2) FIG. 2 is a cross-sectional view of a first embodiment of the present invention.

(3) FIG. 3 is a perspective view of a first embodiment of the present invention.

(4) FIG. 4 is a rear view of a first embodiment of the present invention.

(5) FIG. 5 is a perspective view of a second embodiment of the present invention.

(6) FIG. 6 is a rear view of a second embodiment of the present invention.

LIST OF REFERENCE DESIGNATORS

(7) 1. drill body, 2. quick-changing joint, 3. groove, 4. first clamping surface, 5. transition block, 6. rear cover, 7. external thread, 8. first threaded hole, 9. vent hole, 10. spline hole, 11. second clamping surface, 12. snap-fit area, 13. connecting block, 14. tapered block, 15. second threaded hole, 16. third threaded hole.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(8) The present invention will be further illustrated below with reference to the drawings and specific embodiments. It should be understood that the following specific embodiments are merely used to describe the present invention, rather than to limit the scope of the present invention. It should be noted that the terms “front”, “rear”, “left”, “right”, “upper” and “lower” used in the following description refer to the directions in the drawings, the terms “inside” and “outside” refer to the direction toward or away from the geometric center of a particular component, respectively.

(9) As shown in figures, according to the present invention, a quick-changing brazed drill includes the drill body 1 and the quick-changing joint 2. The drill body 1 and the quick-changing joint 2 are connected detachably; the connection method can be a threaded connection, or an intercepting method using a latch or a circlip; and the main purpose is to facilitate the rapid disassembly and assembly. The vent hole 9 is provided at a connection point between the drill body 1 and the quick-changing joint 2, so that the drill body 1 can be installed more quickly and stably without air resistance.

(10) The drill body 1 is designed into a split-tooth groove type. Specifically, the drill body 1 has a cylindrical structure, the interior of the front end of the drill body 1 is hollow, and the outer side of the front end of the drill body 1 is provided with 2-6 of the grooves 3. This structure design improves the cutting speed and increases the drilling speed by 20%. Moreover, for the drill of the present invention, the brazing technology is used, the design of the cutter bit structure is optimized, and the formula of the powder material of the cutter bit is upgraded, thus the service life is increased by 1-2 times.

(11) The quick-changing joint 2 of the present invention has the following two structures:

Embodiment 1

(12) As shown in FIG. 1, the first quick-changing joint includes the transition block 5 and the rear cover 6. The rear end of the transition block 5 is connected to the rear cover 6 by the external thread 7. The snap-fit area 12 is provided between the transition block 5 and the rear cover 6. The middle portion of the transition block 5 is provided with the first threaded hole 8 and is connected to the rear end of the drill body 1. The vent hole 9 is configured at the rear end of the first threaded hole 8, and a diameter of the vent hole 9 is smaller than the diameter of the first threaded hole 8. The central portion of the rear cover 6 is provided with the spline hole 10. The vent hole 9, the first threaded hole 8, and the spline hole 10 are arranged on a same axis. The external thread 7 and the thread inside the first threaded hole 8 are right-handed threads.

(13) The first quick-changing joint as described in Embodiment 1 can be mounted on an angle grinder. A front end of a motor connecting shaft of the angle grinder is inserted into the snap-fit area 12 from the spline hole 10 of the rear cover 6 to drive the drill body 1 to rotate. Since the threads at the two connection points have reverse teeth, when the threads are right-hand twisted clockwise, the threads are loosen. When the threads are twisted counterclockwise, the treads are tightened. Namely, when the angle grinder rotates normally, the drill body 1, the transition block 5 and the rear cover 6 will become e tighter and tighter, which can ensure the stability of the first quick-changing joint.

(14) The vent hole 9 of this embodiment is configured at the rear end of the first threaded hole 8, and the diameter of the vent hole 9 is smaller than the diameter of the threaded hole 8. This not only limits the stroke length of the drill body 1, but also ensures that when the drill body 1 is screwed into the first threaded hole 8, there is no air resistance, and the replacement is quicker and more convenient.

(15) In this embodiment, two symmetrical first clamping surfaces 4 are arranged in the middle portion of the side surface of the drill body 1 to facilitate the rapid disassembly and assembly of the drill body 1. Two symmetrical second clamping surfaces 11 are provided on the side surface of the transition block 5 of the quick-changing joint 2 to facilitate the separation of the transition block 5 from the rear cover 6.

(16) The drill as described in this embodiment can be freely matched with different types of machines conveniently. For example, the drill body 1 and the quick-changing joint 2 can be mounted on an angle grinder with a faster rotation speed for drilling; and the drill body 1 can also be directly assembled to a gun drill for drilling, and the diameter of the drill body 1 is 5-20 mm. In addition, the rear covers (the diameters of the spline holes thereof are 5-40 mm) with different aperture diameters are provided for customers to be matched with different models and different specifications of angle grinders or gun drills at home and abroad, achieving a wide application range.

Embodiment 2

(17) As shown in FIG. 5, the second quick-changing joint includes the connecting block 13 and the tapered block 14. The front end of the tapered block 14 is provided with the second threaded hole 15 and is connected to the rear end of the drill body 1. The connecting block 13 is configured at the rear end of the tapered block 14. The third threaded hole 16 is provided inside the rear end of the connecting block 13. The vent hole 9 is configured at the rear end of the second threaded hole 15 and interconnected to the third threaded hole 16. The diameter of the vent hole 9 is smaller than the diameter of the second threaded hole 15.

(18) Embodiment 2 is the same as Embodiment 1 in that the drill body 1 can be disassembled and then mounted on angle grinders or pistol drills of different models and specifications for drilling. The difference between Embodiment 2 and Embodiment 1 lies in that the motor connecting shaft of the angle grinder is connected to the second quick-changing joint by the third threaded hole 16 to drive the drill body 1 to rotate, and the rear end of the third threaded hole 16 is also provided with the vent hole 9.

(19) The third threaded hole 16 of the present embodiment has a diameter of 6-20 mm, and can be matched with different models and different specifications of large or small angle grinders at home and abroad, having a wide application range.

(20) A manufacturing process of the quick-changing brazed drill according to the present invention includes the following steps:

(21) (1) a drill base, a joint and a rear cover are processed;

(22) (2) an adhesive is adjusted, and the adhesive is dispensed on a drill base;

(23) (3) a diamond is dispensed on the drill base, and a solder is dispensed on the drill bit base; and a weight ratio of the solder is: Ni (84%), Fe (4%), Cr (9%), Ti (3%);

(24) (4) a drill is vacuum brazed and sintered;

(25) (5) the rear cover is punched;

(26) (6) the drill, the joint and the rear cover are assembled;

(27) (7) an overall sandblasting and a painting are performed; and

(28) (8) a laser marking and a packaging are performed.

(29) The drill of the present invention has a scientific manufacturing process. The brazing technology is used to improve the strength, the design of the cutter bit structure is optimized, and the formula of the powder material of the cutter bit is upgraded, so that the service life of the drill is longer. The drilling experiments are shown as follows.

(30) Test Material:

(31) 1. hard tile model: Italian imported tiles (STGEA2-H2);

(32) 2. hardness level of tile: 8

(33) 3. size of hard tile: 472 mm×409 mm×10 mm

(34) 4. weight: 10 kg.

(35) Test tool: 1. Mac Allister gun drill; 2. power: 600 kW; 3. speed: 2900 rpm.

(36) Test method: dry drill (cooling with coolant)

Ordinary Drill φ10 mm Available on the Market

(37) TABLE-US-00001 time consuming (per hole) serial number s 1-5 21.70 23.50 28.10 42.50 28.80  6-10 38.20 51.60 28.40 53.10 47.60 11-15 30.50 31.60 40.40 37.60 55.70 16-20 52.30 52.70 71.30 77.80 62.70 21-25 26-30 31-35 36-40 41-45 average 43.81 cooling time (s) 2.00 average 43.81 lifetime 20 speed (s/per) (number of hole)

Quick-Changing Brazed Drill φ10 mm

(38) TABLE-US-00002 time consuming (per hole) serial number s 1-5 25.00 18.00 28.00 24.00 22.00  6-10 22.00 23.00 32.00 31.00 27.00 11-15 30.00 34.00 33.00 45.00 39.00 16-20 38.00 41.00 46.00 44.00 39.00 21-25 44.00 32.00 32.00 27.00 27.00 26-30 26.00 33.00 33.00 31.00 35.00 31-35 37.00 48.00 49.00 58.00 41.00 36-40 46.00 48.00 54.00 41.00 43.00 41-45 average 35.65 cooling time (s) 2.00 average 35.65 lifetime >40 speed (s/per) (number of hole)

(39) It can be seen from the comparison experiment that:

(40) 1. The service life of the ordinary drill is about for drilling 20 holes; and the service life of the quick-changing brazed drill of the present invention is for drilling more than 40 holes. The service life of the quick-changing brazed drill of the present invention is over two times longer than that of the ordinary drill.

(41) 2. The average drilling speed of the ordinary drill is about 43 seconds; and the quick-changing brazed drill of the present invention only takes about 35 seconds. The speed is increased by about 20%.

(42) The technical means disclosed in the technical solution of the present invention is not limited within the technical means disclosed in the above embodiments, but includes a technical solution composed of any combination of the above technical features.