Three-blade stepped blind hole drill

Abstract

The utility model discloses a three-blade stepped blind hole drill, and relates to the technical field of blind hole drills. The drill bit comprises a clamping handle part, a step working part is arranged at the end part of the clamping handle part, a drilling working part is arranged at the end part of the step working part, a hard alloy integral drill bit is welded at the end part of the drilling working part, and three groups of spiral grooves are formed in the surfaces of the step working part, the drilling working part and the hard alloy integral drill bit. According to the utility model, the three groups of spiral grooves are additionally arranged, so that the drill bit can more effectively remove chips and reduce the friction between the chips and the drill bit in the drilling process, thereby reducing the risk of edge cracking, improving the smoothness of a hole wall and prolonging the service life of the drill bit, and the drill bit is more suitable for high-rotating-speed machining in a machining center; when the step drill is blunt and needs to be ground, the length of the step drill is inconsistent after grinding, and the extending length of the adjusting screw in the threaded hole is adjusted to achieve the same length of the step drill.

Description

TECHNICAL FIELD

[0001] The utility model relates to blind hole drilling technical field, concretely relates to a three blade step blind hole drill. BACKGROUND

[0002] In the modern industrial processing field, especially in the processing of materials such as wood, plastic and metal, blind hole drilling is a commonly used tool, and the existing two-blade blind hole step drill has some deficiencies in practical application:

[0003] In the drilling process, especially in high-speed machining in machining centers, the existing two-blade blind hole step drill is prone to material edge burst phenomenon, affecting the machining precision and surface quality.

[0004] The hole wall surface roughness after drilling is large, and additional processing procedures are required to achieve the required smoothness, increasing production cost and time.

[0005] Due to design limitations, the existing two-blade blind hole step drill is prone to wear during use, resulting in frequent replacement and increased production cost.

[0006] Therefore, a three-blade step blind hole drill is proposed. SUMMARY

[0007] The utility model discloses a three-blade step blind hole drill to solve the problems in the background art.

[0008] The utility model discloses a three-blade step blind hole drill to solve the problems in the background art.

[0009] A three-blade step blind hole drill, comprising a clamping handle, the end of the clamping handle is provided with a step working part, the end of the step working part is provided with a drilling working part, the end of the drilling working part is welded with a hard alloy integral drill bit, three groups of spiral grooves are arranged on the surfaces of the step working part, the drilling working part and the hard alloy integral drill bit, a hard alloy piece is arranged on the surface of the step working part, a cutting edge is arranged at the edge of the hard alloy integral drill bit, a threaded hole is arranged at the bottom end of the clamping handle, and a adjusting screw is screwed into the threaded hole.

[0010] Further, a flat step is arranged on the surface of the clamping handle to be locked by a fixing piece.

[0011] Further, a center positioning tip is arranged at the end of the hard alloy integral drill bit to be used for center positioning during drilling.

[0012] Further, the V-shaped surface of the drilling working part is welded with the V-shaped surface of the hard alloy integral drill bit.

[0013] Further, the clamping handle, the stepped working part and the drilling working part are made of 40Cr steel.

[0014] The utility model discloses the beneficial effect is as follows:

[0015] By increasing three groups of spiral grooves, the drill bit can more effectively remove chips during drilling, reducing the friction between the chips and the drill bit, thereby reducing the risk of edge explosion, improving the smoothness of the hole wall, prolonging the service life of the drill bit, and being more suitable for high-speed machining in the machining center. By adjusting the screw, when the stepped drill is blunt, it needs to be ground. After grinding, the length is inconsistent. Adjust the length of the adjusting screw in the threaded hole to make the length of the stepped drill the same.

[0016] By the center positioning of the center positioning tip of the hard alloy integral drill bit end, the accuracy of drilling is ensured, deviation is avoided, and the machining precision is improved. The design of three groups of spiral grooves and the synergistic effect of three cutting edges make the chips in the drilling process be discharged in time, reduce the friction between the chips and the drill bit, thereby reduce the risk of edge explosion, so that a more smooth hole wall surface is obtained, the subsequent machining process is reduced, and high-speed machining in the machining center is more suitable.

[0017] By the threaded hole at the bottom end of the clamping handle and the adjusting screw design, the total length of the drill bit can be adjusted by the extension and retraction of the adjusting screw after the drill bit is ground, so that the drill bits with different degrees of wear can maintain consistent machining size, improving the flexibility and economy of use.

[0018] The V-shaped welding part of the hard alloy integral drill bit is arranged in the V-shaped face of the drilling working part, which ensures the overall rigidity and stability of the drill bit, so that the drill bit is not easy to deform during machining, the runout is small, the drilled hole size is stable, and the quality is reliable. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is the three-dimensional structure schematic diagram of the utility model;

[0020] Fig. 2 It is the front view of the utility model;

[0021] Fig. 3 It is the sectional view of the utility model;

[0022] Fig. 4 It is the top view of the utility model;

[0023] Reference signs: 1, clamping handle; 11, flat step; 2, stepped working part; 21, hard alloy piece; 3, drilling working part; 4, hard alloy integral drill bit; 5, center positioning tip; 6, threaded hole; 7, adjusting screw; 8, cutting edge; 9, spiral groove. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0026] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the embodiments of the present application, it should be noted that the directions or position relationships indicated by the terms "inner", "outer", "upper", etc. are based on the directions or position relationships shown in the drawings, or the directions or position relationships of the present application product when it is usually placed, which are only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular direction, be constructed and operated in a particular direction, therefore, cannot be understood as a limitation on the present application.

[0028] As Figs. 1 to 4As shown, a three-blade stepped blind hole drill includes a clamping handle 1, the end of the clamping handle 1 is provided with a stepped working part 2, the end of the stepped working part 2 is provided with a drilling working part 3, the end of the drilling working part 3 is welded with a hard alloy integral drill bit 4, the surfaces of the stepped working part 2, the drilling working part 3 and the hard alloy integral drill bit 4 are provided with three groups of spiral grooves 9, and the surface of the stepped working part 2 is provided with a hard alloy piece 21, the edge of the hard alloy integral drill bit 4 is provided with a cutting edge 8, the bottom end of the clamping handle 1 is provided with a threaded hole 6, and the threaded hole 6 is threadedly connected with an adjusting screw 7. More specifically, by increasing three groups of spiral grooves 9, the drill bit can more effectively remove chips during drilling, reducing the friction between the chips and the drill bit, thereby reducing the risk of edge explosion, improving the smoothness of the hole wall, prolonging the service life of the drill bit, and being more suitable for high-speed machining in machining centers. By adjusting the M5 screw, when the stepped drill is blunt, it needs to be ground. After grinding, the lengths are inconsistent. Adjust the length of the adjusting screw 7 in the threaded hole 6 to achieve the same length of the stepped drill.

[0029] The surface of the clamping handle 1 is provided with a flat stepped part 11, which is locked by a fixing part. More specifically, the design of the flat stepped part 11 can provide a larger contact area and more stable locking effect when the clamping handle 1 is locked by a fixing part such as a screw, preventing the drill bit from loosening during machining and ensuring the accuracy and safety of machining.

[0030] The end of the hard alloy integral drill bit 4 is provided with a center positioning tip 5 for center positioning during drilling. More specifically, the center positioning tip 5 at the end of the hard alloy integral drill bit 4 can accurately position the center of the drill bit at the beginning of drilling, ensuring the accuracy of drilling and avoiding machining errors caused by drill bit deviation, especially when machining high-precision blind holes, which can significantly improve the machining quality.

[0031] The V-shaped corresponding drilling working part 3 of the hard alloy integral drill bit 4 is welded. More specifically, this V-shaped welding method can control the runout of the drill bit during machining to within 0.15mm, ensuring the balance and stability of the drill bit, reducing the roughness of the hole wall and the wear of the drill bit caused by excessive runout, and improving the machining efficiency and the service life of the drill bit.

[0032] The clamping handle 1, the stepped working part 2 and the drilling working part 3 are all made of 40Cr steel. More specifically, by using 40Cr steel for the clamping handle 1, the stepped working part 2 and the drilling working part 3, the 40Cr steel has good comprehensive mechanical properties and can obtain high hardness and toughness after heat treatment, which is suitable for manufacturing drill bits that need to withstand large cutting force and impact force, ensuring the durability and reliability of the drill bit during machining.

[0033] In summary: by increasing three groups of helical grooves 9, the drill bit can more effectively remove chips during drilling, reduce the friction between the chips and the drill bit, thereby reducing the risk of edge explosion, improving the smoothness of the hole wall, prolonging the service life of the drill bit, and being more suitable for high-speed machining in machining centers, by adjusting the screw 7 with M5 screw, when the stepped drill is blunt, it needs to be ground, after grinding, the length is inconsistent, adjust the length of the adjusting screw 7 protruding in the threaded hole 6, so that the length of the stepped drill is the same.

[0034] The basic principle, main characteristics and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection required by the present application is defined by the appended claims and their equivalents.

Claims

1. A three-lip stepped blind hole drill characterized by, The utility model provides a kind of drill, including clamping handle (1), the end of clamping handle (1) is provided with stepped work part (2), the end of stepped work part (2) is provided with drilling work part (3), the end of drilling work part (3) is welded with hard alloy integral drill (4), the surface of stepped work part (2), drilling work part (3) and hard alloy integral drill (4) is provided with three groups of spiral groove (9), and the surface of stepped work part (2) is provided with hard alloy piece (21), hard alloy integral drill (4) edge is provided with cutting edge (8), the bottom end of clamping handle (1) is provided with threaded hole (6), and threaded hole (6) is screwed with adjusting screw (7) in threaded.

2. The three-lip stepped blind drill according to claim 1, wherein, The surface of the clamping handle (1) is provided with a flat stepped (11) to be locked by a fixing element.

3. The three-lip stepped blind drill according to claim 1, wherein, The end of the hard alloy integral drill (4) is provided with a centering point (5) for centering during drilling.

4. The three-lip stepped blind drill according to claim 1, wherein, The V-shaped corresponding drilling work part (3) of the hard alloy integral drill (4) is welded.

5. The three-lip stepped blind drill according to claim 1, wherein, The clamping handle (1), stepped work part (2) and drilling work part (3) are made of 40Cr steel.

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