Centering sheet drill

Abstract

The utility model relates to a centering sheet drill which comprises a drill handle and a drill bit body connected to the front side of the drill handle. The drill bit main body comprises two drill edges; a drill tip is arranged on the side, away from the drill handle, of the drill bit body, the sections, located on the drill tip, of the two drill edges are each provided with two top faces outwards in the radial direction of the drill bit body, the two top faces intersect to form an L shape, meanwhile, steps are further reserved in the positions, close to the drill tip, of the two drill edges, and therefore the section of the drill tip is of an E-shaped structure. A chisel edge is formed on one side of the drill point of the two drill edges, and an included angle of 5-10 degrees is formed between the chisel edge and the central parting surface of the drill bit main body. According to the centering sheet drill, the shape of the drill tip and the chisel edge are redesigned, the length of the chisel edge is reduced, and the chisel edge cutting edge front angle is the positive front angle, so that hard extrusion drilling of the chisel edge is changed into positive front angle cutting, drilling is easy to position and center, cutting is light and fast, and cutting heat is little.

Description

TECHNICAL FIELD

[0001] The utility model relates to a drill bit, in particular to a centering thin plate drill. BACKGROUND

[0002] With the continuous development of the drill bit field technology, all kinds of drill bits have emerged, and the twist drill is very suitable for cutting round holes and is widely used, which can be clamped on the hand-held drilling tool or drill bed, milling machine, lathe and even machining center for use. However, the standard twist drill is often used for drilling on the thin plate in the sheet metal manufacturing, cabinet assembly and home decoration in the mechanical processing industry. The traditional process usually uses ordinary twist drill as a cutting tool for drilling on the thin plate, and the following defects are prone to occur during and after processing:

[0003] It is difficult to position the initial drilling, especially when using a hand drill, on one hand, it is difficult to cut and position, and it is easy to shake;

[0004] After processing, the hole around the hole is concave and has burrs, which affects the appearance of the hole shape;

[0005] The hole shape is oval or polygonal;

[0006] When the through hole is about to be drilled, the drill bit is prone to be stuck, which makes the small diameter drill bit prone to break;

[0007] The burr on the back of the hole is serious, especially when processing stainless steel plate, nickel steel plate and other difficult-to-process materials.

[0008] Therefore, when using ordinary twist drill to process holes on the thin plate, there are obvious deficiencies in processing quality and operation convenience. The reasons for the above defects are due to the insufficient and defective structure of the ordinary twist drill. INVENTION CONTENTS

[0009] The technical problem to be solved by the utility model is to provide a centering thin plate drill capable of improving processing quality.

[0010] To solve the above technical problems, the technical scheme of the utility model is as follows: a telescopic transportation joist, which is characterized by comprising a drill handle and a drill bit main body connected to the front side of the drill handle;

[0011] The drill bit main body comprises two drill edges symmetrically distributed with the center line of the drill bit main body as the central axis, the drill edges are in a spiral shape, one side of the drill edge is a main cutting edge, the other side is a groove back, and the main cutting edge of one drill edge and the groove back of the other drill edge jointly form a chip removal groove;

[0012] The drill bit body is provided with two drill edges on the side far from the drill handle, and the two drill edges on the side of the drill tip are provided with two top surfaces in L shape intersecting outward along the radial direction of the drill bit body, and the two drill edges are provided with steps close to the drill tip, so that the cross section of the drill tip forms a mountain-shaped structure.

[0013] The two drill edges on the side of the drill tip are provided with a cross edge, and the cross edge and the center parting surface of the drill bit body form an included angle of 5-10 degrees.

[0014] Further, the top surface of the two drill edges is an inclined inclined surface, and the top surface of the drill edge gradually deviates from the reference surface from the side far from the drill tip.

[0015] Further, the included angle between the rear edge of the top surface of the drill edge and the outer edge of the top of the drill tip is an acute angle.

[0016] Further, the cross section of the chip removal groove is in parabolic shape.

[0017] The centering thin plate drill has the advantages that the shape of the drill tip and the cross edge are redesigned, the length of the cross edge is reduced, the cross edge cutting edge is a positive rake angle, the cross edge is changed from hard extrusion drilling to positive rake angle cutting, the drilling is easy to position and center, the cutting is relatively fast, and the cutting heat is small.

[0018] The design of the top surface of the drill edge with the inner low and outer high cutting edge can effectively cut the material of the hole edge, so that burrs are not generated on the back surface when drilling the thin plate.

[0019] The design of the parabolic shape of the chip removal groove further improves the rigidity of the drill bit, increases the chip space, is beneficial to smooth chip removal, and reduces the blockage. DRAWINGS

[0020] Fig. 1 It is a schematic view of the centering thin plate drill.

[0021] Fig. 2 It is a schematic view of the drill tip in the utility model.

[0022] Fig. 3 It is a schematic view of the chip removal groove in the utility model. CONCRETE IMPLEMENTING METHOD

[0023] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific implementing method, structure, features and effects of the utility model will be described in detail as follows in combination with the drawings and the preferred embodiments.

[0024] For example, Figs. 1-3The centering thin plate drill comprises a drill handle and a drill head body connected to the front side of the drill handle.

[0025] The drill head body comprises two drill edges 1 symmetrically distributed along the center line of the drill head body, the drill edges 1 are in a spiral shape, one side of the drill edge 1 is a main cutting edge, the other side of the drill edge 1 is a groove back, and the main cutting edge of one of the drill edges 1 cooperates with the groove back of the other drill edge 1 to form a chip removal groove 2, the cross-sectional profile of the chip removal groove 2 is in a parabolic shape, so that the chip removal groove 2 forms an open "V" type structure. The design of the parabolic chip removal groove 2 further improves the rigidity of the drill bit, and also increases the chip space, which is beneficial to smooth chip removal and reduces blockage.

[0026] The side of the drill head body away from the drill handle is a drill tip 3, and the two drill edges 1 at the drill tip 3 have two L-shaped top surfaces 11 outwardly intersecting along the radial direction of the drill head body, and the two drill edges 1 near the drill tip 3 also have steps, so that the cross section of the drill tip 3 forms a mountain-shaped structure, and the included angle between the rear edge of the top surface of the drill edge 1 and the outer edge of the top of the drill tip 3 is an acute angle.

[0027] The top surface 11 of the two drill edges 1 is an inclined surface, taking the horizontal plane where the vertex of the drill tip 3 is located as a reference surface, the top surface of the drill edge 1 gradually moves away from the reference surface from the side away from the drill tip 3. The design of the top surface 11 of the drill edge 1 in this way makes the top surface 11 of the drill edge 1 form a cutting edge design of low inside and high outside, which can effectively cut the material of the hole edge, so that burrs are not generated on the back surface when drilling thin plates.

[0028] The side of the two drill edges 1 at the drill tip 3 forms a horizontal edge 4, and the horizontal edge 4 and the center parting surface of the drill head body form an included angle of 5°-10°. The design of the horizontal edge 4 improves the included angle between the horizontal edge 4 and the center parting surface of the drill head body, so that the rake angle of the cutting edge of the horizontal edge 4 becomes a positive rake angle, so that the horizontal edge changes from hard extrusion drilling to positive rake angle cutting, which can also reduce the length of the horizontal edge, so that the drilling is easy to position and center, the cutting is light and fast, and the cutting heat is less.

[0029] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, but as long as it does not deviate from the technical solution of the present application, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A centering sheet drill, characterized by: The drill bit comprises a drill shank and a drill bit body connected to the front side of the drill shank. The drill bit body comprises two drill edges symmetrically distributed along the center line of the drill bit body, the drill edges are helical, one side of the drill edges is a main cutting edge, the other side is a groove back, and the main cutting edge of one drill edge cooperates with the groove back of the other drill edge to form a chip removal groove. The side of the drill bit body away from the drill shank is a drill tip, and the two drill edges at the drill tip have two intersecting L-shaped top surfaces along the radial direction of the drill bit body, and the two drill edges also have steps near the drill tip, so that the cross section of the drill tip forms a mountain-shaped structure. The two drill edges at the drill tip form a cross edge, and the cross edge and the center parting surface of the drill bit body form an included angle of 5°-10°.

2. The centering wafer drill according to claim 1, characterized in that: The top surface of the two drill edges is an inclined surface, and the top surface of the drill edge gradually moves away from the reference surface from the side away from the drill tip.

3. The centering wafer drill according to claim 1, wherein: The included angle between the rear edge of the drill edge top surface and the outer edge of the drill tip top part is an acute angle.

4. The centering wafer drill of claim 1 wherein: The cross section of the chip removal groove is in a parabolic shape.

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