U-shaped drill capable of avoiding burrs generated during aluminum alloy drilling

Abstract

The utility model discloses a U-shaped drill capable of avoiding burrs generated during aluminum alloy drilling. The U-shaped drill comprises a U-shaped drill cutter bar, a first cutting blade and a second cutting blade, wherein the first cutting blade and the second cutting blade are arranged on the U-shaped drill cutter bar; the first cutting blade is arranged at the position away from the axis of the U-shaped drill tool bar and rotates around the axis of the U-shaped drill tool bar in the rotating process, the cutting edge on the outermost side of the first cutting blade is parallel to the axis of the U-shaped drill tool bar, and the radius of the U-shaped drill tool bar is smaller than the distance from the cutting edge on the outermost side to the axis of the U-shaped drill tool bar. A first cutting point of the first cutting blade is a point at the foremost end of the cutting part of the whole cutter, and the first cutting point is not only located at the foremost end in the axial direction of the cutter, but also located at the outermost side in the radial direction of the cutter. According to the utility model, the problems of burrs and adhesion at the edge of a hole when the U-shaped drill is used for drilling the aluminum alloy are well solved, and the U-shaped drill has the characteristics of good reliability and high safety.

Description

Technical Field

[0001] The utility model relates to the technical field of U drills for metal material processing, in particular to a U drill capable of preventing burrs from being generated when drilling holes in aluminum alloys. Background Art

[0002] In the field of mechanical manufacturing, hole processing is often encountered. The connection of various parts requires screw holes, pin holes or rivet holes of different sizes; in order to fix the transmission parts, various mounting holes are required; the machine parts themselves also have many various holes (such as oil holes, process holes, weight reduction holes, etc.). Various methods are involved in the processing of the above holes, and U drilling is one of the common processing methods. U drilling has the advantages of good rigidity, low loss cost, only need to replace the blade, and high efficiency in processing holes. At the same time, the maximum processing diameter of U drilling is larger than that of ordinary drill bits, and the maximum can reach D50-60mm. Because of these advantages of U drilling processing, many U drilling processing technologies are also applied when processing aluminum alloys, involving U drilling processing used in automotive aluminum alloy bumpers, longitudinal beams, new energy battery boxes, etc.

[0003] In the processing of aluminum alloy parts, due to the large diameter of the U drill and the large cutting amount, the outer circle linear speed of the tool will be very fast when cutting at high speed; at the same time, the aluminum alloy is soft, the processing viscosity is large, and the cutting heat will cause the tool to stick. The above factors cause a large number of burrs to appear when the U drill processes aluminum alloy through holes, especially on the back side of the drilling exit. In the aluminum alloy drilling process, the U drill drilling process is as follows: during the downward cutting process, the U drill cuts the material every turn, and the tool is also feeding downward. In this process, the parts are not only subjected to the cutting force of the drill bit, but also the downward extrusion force of the drill bit. The front part of the U drill is two blades, which are installed obliquely, and the most protruding parts of the blades are at 1 / 3 and 2 / 3 of the diameter of the blade body. These two points are also the first to be cut. When the U drill cuts to the aluminum alloy hole and is about to penetrate, the remaining material in the hole is relatively thin and cannot withstand the downward extrusion force of the U drill edge, and is directly pushed away by the U drill along the axial direction of the hole. Since the last material in the hole is pushed out instead of cut by the tool, a large number of burrs will appear on the edge of the hole. These exit burrs cannot be effectively cut off by the U drill, but are squeezed out to the exit side of the hole. The burr height is generally 1-1.6mm, solid and difficult to remove. At the same time, the ejected sheet will not fall off completely because it is more adhered to the product, but is still adhered to the product hole and hangs on the edge of the hole.

[0004] The burrs and the pieces that have not completely fallen off after drilling with U drills will affect the assembly of matching parts and scratch the operator during the workpiece transfer process. If it is a welding matching hole, it will also cause the weld to melt during welding and fail to effectively weld to the parent material and parts. Removing burrs by adding processes will consume a lot of manpower and equipment, increasing the production cost of the product. Utility Model Content

[0005] The utility model is used to overcome the defects of the prior art and provide a U drill which can avoid burrs when drilling holes in aluminum alloy, so as to solve the problems mentioned in the background art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A U-drill capable of preventing burrs from being generated when drilling holes in aluminum alloy comprises a U-drill shank and a first cutting blade and a second cutting blade arranged thereon; the first cutting blade is arranged away from the axis of the U-drill shank and rotates around the axis of the U-drill shank during its rotation, the outermost cutting edge of the first cutting blade is parallel to the axis of the U-drill shank, and the radius of the U-drill shank is smaller than the distance from the outermost cutting edge to the axis of the U-drill shank; the first cutting point of the first cutting blade is the frontmost point of the entire tool cutting part, and the first cutting point is not only located at the frontmost in the axial direction of the tool, but also located at the outermost in the radial direction of the tool.

[0008] The U-drill that can avoid burrs when drilling aluminum alloys has the innermost edge of the second cutting blade covering the axis of the tool, and there are cross-overlapping parts during the rotational cutting process of the second cutting blade and the first cutting blade.

[0009] The U drill that can avoid burrs when drilling aluminum alloys has the frontmost cutting point exceeding the second cutting point of the second cutting blade, and the distance d3 between the two is 3-5 mm.

[0010] The U-drill that can avoid burrs when drilling aluminum alloy has a U-drill shank radius d1 and a distance d2 from the outermost cutting edge to the axis of the U-drill shank that is ≥0.3 mm.

[0011] In the above-mentioned U-drill capable of avoiding burrs when drilling aluminum alloy, the angle α between the plane where the first cutting blade is located and the plane where the second cutting blade is located is 170-180 degrees.

[0012] The U-drill that can avoid burrs in aluminum alloy drilling is provided with a central water outlet hole at the axis of the U-drill arbor. The central water outlet hole is bifurcated into a first water outlet hole and a second water outlet hole near the cutter head. The water outlet holes of the first water outlet hole and the second water outlet hole spray water toward the first cutting blade and the second cutting blade respectively. Beneficial Effects

[0013] Compared with the prior art, the utility model has the following advantages: first, the first cutting blade is arranged away from the axis of the U-drill arbor, and its outermost cutting edge is parallel to the U-drill arbor. The first cutting point is the frontmost point of the entire tool cutting part. The first cutting point is not only located at the frontmost end in the axial direction of the tool, but also located at the outermost side in the radial direction of the tool. In this design, when processing a hole, the outermost circle of the hole is first cut by the first cutting point 1-2. When the last part is processed and the hole is about to be processed through, the first cutting point 1-2 first cuts the material of the outermost circle of the hole. In this way, when the unprocessed sheet in the middle is squeezed out by the downward extrusion force of the U-drill, there will be no situation where there are a large number of torn burrs on the edge of the hole. Second, the innermost edge of the second cutting blade covers the axis of the tool, and there is an overlapping part when the second cutting blade and the first cutting blade rotate and cut. With this design, the first cutting blade 1 is responsible for cutting the peripheral material of the hole and can scrape off burrs, and the second cutting blade 2 is responsible for cutting the remaining material in the hole. There is an overlapping part in the cutting of the two, and the angle α between the plane where the first cutting blade is located and the plane where the second cutting blade is located is 170-180 degrees, which can ensure the quality of the hole opening and the stability of the cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is another structural schematic diagram of the utility model;

[0017] Figure 3 It is another structural schematic diagram of the utility model;

[0018] Figure 4 This is a partial structural diagram of the utility model

[0019] The symbols in the figure represent:

[0020] 1. First cutting blade, 2. Second cutting blade, 3. U-drill arbor, 4. Center water outlet hole, 1-1. Outermost cutting edge, 1-2. First cutting point, 2-1. Innermost cutting edge, 2-2. Second cutting point, 4-1. First water spray hole, 4-2. Second water spray hole, 5. Tool handle, 6. Power head. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1-4 As shown, the utility model comprises a U-drill arbor 3 and a first cutting blade 1 and a second cutting blade 2 arranged thereon.

[0023] The first cutting blade 1 is arranged far away from the axis of the U drill shank 3, and rotates around the axis of the U drill shank 3 during its rotation, and its outermost cutting edge 1-1 is parallel to the axis of the U drill shank 3, and the radius of the U drill shank 3 is smaller than the distance from the outermost cutting edge 1-1 to the axis of the U drill shank 3;

[0024] The first cutting point 1-2 of the first cutting blade 1 is the frontmost point of the entire tool cutting part. The first cutting point 1-2 is not only located at the frontmost in the axial direction of the tool, but also located at the outermost in the radial direction of the tool. The arc size at the chamfer of the tool is ignored here, and the arc size at the chamfer of the tool is taken into account. The frontmost cutting point 1-2 is close to the outermost cutting edge 1-1.

[0025] With this design, when processing a hole, the outermost part of the hole is first cut by the first cutting point 1-2. When the last part is processed and the hole is about to be processed through, the first cutting point 1-2 first cuts the material of the outermost part of the hole. In this way, when the unprocessed piece of material in the middle is squeezed out by the downward extrusion force of the U drill, there will be no large number of torn burrs on the edge of the hole.

[0026] Corresponding to the first cutting blade 1, the second cutting blade 2 is arranged near the axis of the U drill arbor 3, and the innermost edge 2-1 of the second cutting blade 2 covers the axis of the tool. During the rotation and cutting process, the second cutting blade 2 and the first cutting blade 1 have a cross-overlapping portion.

[0027] The angle α between the plane where the first cutting blade 1 is located and the plane where the second cutting blade 2 is located is 170-180 degrees.

[0028] With this design, the first cutting blade 1 is responsible for cutting the material around the hole and can scrape off burrs, and the second cutting blade 2 is responsible for cutting the remaining material in the hole. The two cuttings have overlapping parts, and the angle α between the plane where the first cutting blade 1 is located and the plane where the second cutting blade 2 is located is 170-180 degrees, which can ensure the quality of the hole and the stability of the cutting.

[0029] The specific positional relationship between the first cutting blade 1 and the second cutting blade 2 is as follows: the frontmost cutting point 1-2 exceeds the second cutting point 2-2 of the second cutting blade 2, and the distance d3 between the frontmost cutting point 1-2 and the second cutting point 2-2 is 3-5 mm.

[0030] The installation position relationship of the first cutting blade 1 adopts: the relationship between the radius d1 of the U drill shank 3 and the distance d2 from the outermost cutting edge 1-1 to the axis of the U drill shank 3 is d2-d1≥0.3mm.

[0031] In order to facilitate the cooling of the blade during cutting and ensure the stability of tool performance, the following solution is adopted: a central water outlet hole 4 is set at the axis of the U drill arbor 3, and the central water outlet hole 4 is forked into a first water spray hole 4-1 and a second water spray hole 4-2 near the cutter head. The water spray directions of the first water spray hole 4-1 and the second water spray hole 4-2 are respectively toward the first cutting blade 1 and the second cutting blade 2.

Claims

1. A U drill capable of preventing burrs from being generated when drilling holes in aluminum alloy, characterized in that: The invention comprises a U-drill shank (3) and a first cutting blade (1) and a second cutting blade (2) arranged thereon; the first cutting blade (1) is arranged away from the axis of the U-drill shank (3), rotates around the axis of the U-drill shank (3) during its rotation, the outermost cutting edge (1-1) of the first cutting blade (1) is parallel to the axis of the U-drill shank (3), and the radius of the U-drill shank (3) is smaller than the distance from the outermost cutting edge (1-1) to the axis of the U-drill shank (3); the first cutting point (1-2) of the first cutting blade (1) is the frontmost point of the entire tool cutting part, and the first cutting point (1-2) is not only located at the frontmost in the axial direction of the tool, but also located at the outermost in the radial direction of the tool.

2. The U drill capable of avoiding burrs when drilling aluminum alloy according to claim 1 is characterized in that: The innermost cutting edge (2-1) of the second cutting blade (2) covers the axis of the tool, and during the rotational cutting process, the second cutting blade (2) and the first cutting blade (1) have a cross-overlapping portion.

3. The U drill capable of avoiding burrs when drilling aluminum alloy according to claim 1 is characterized in that: The frontmost cutting point (1-2) exceeds the second cutting point (2-2) of the second cutting blade (2), and a distance d3 between the two is 3-5 mm.

4. The U drill capable of avoiding burrs when drilling aluminum alloy according to claim 1, characterized in that: The relationship between the radius d1 of the U drill shank (3) and the distance d2 from the outermost cutting edge (1-1) to the axis of the U drill shank (3) is (d2-d1)≥0.3 mm.

5. The U drill capable of avoiding burrs when drilling aluminum alloy according to claim 1, characterized in that: The angle α between the plane where the first cutting blade (1) is located and the plane where the second cutting blade (2) is located is 170-180 degrees.

6. The U drill capable of avoiding burrs when drilling aluminum alloy according to claim 1, characterized in that: A central water outlet hole (4) is provided at the axis of the U drill shank (3); the central water outlet hole (4) is bifurcated into a first water outlet hole (4-1) and a second water outlet hole (4-2) near the cutter head; the first water outlet hole (4-1) and the second water outlet hole (4-2) spray water towards the first cutting blade (1) and the second cutting blade (2), respectively.

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