Drilling and reaming drill
By designing a auger drill with spiral cutting edges and arc-shaped transverse cutting edges, the vibration problem of ordinary twist drills was solved, achieving efficient and high-precision hole machining, and improving hole wall quality and machining efficiency.
Patent Information
- Application Number
- CN202422821817.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2034-11-19
AI Technical Summary
Existing conventional twist drills are prone to vibration during drilling, resulting in polygonal vibration marks and spiral tool marks at the bottom of the hole. This makes it difficult to meet the requirements for high-precision and low-roughness hole machining, increasing processing costs and time.
A drilling and reaming drill is designed, which uses three evenly distributed spiral drill bits and an arc-shaped chisel edge, combined with a parabolic chip flute, to achieve simultaneous drilling and hole wall finishing, thereby enhancing the rigidity and guidance of the drill bit.
It achieves efficient and high-precision hole machining, shortens machining time, improves hole wall accuracy and hole diameter accuracy, and reduces roughness.
Smart Images
Figure CN223876140U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a drill bit, specifically a drill and reaming drill. BACKGROUND
[0002] Hole processing cutter is one of the most used cutters in cutting processing, and is a kind of cutter that is widely applied at present. Hole processing occupies an important position in cutting processing, and generally accounts for 1 / 3 of machining amount, wherein drilling accounts for about 22%-25%, and twist drill is the most widely used cutter in drilling processing. With the rapid development of modern manufacturing industry, cutting tools are developing towards "precision, high efficiency, flexibility, intelligence and green environmental protection".
[0003] Ordinary twist drill is widely used for drilling processing, and ordinary twist drill is all double-edged, for example, a kind of high-performance twist drill mentioned in patent CN2499154Y, which is double-edged twist drill. When this kind of twist drill cuts into workpiece, it often produces shaking phenomenon, and is easy to produce odd polygon vibration lines at hole bottom and obvious spiral marks on hole wall. For processing with higher requirements on hole diameter and hole surface roughness, reaming processing is needed, which increases processing cost and reduces production efficiency. SUMMARY
[0004] The technical problem to be solved by the utility model is to provide a drill and reaming drill capable of drilling and polishing hole wall at the same time.
[0005] To solve the above technical problem, the technical scheme of the utility model is as follows: a drill and reaming drill, which is characterized by comprising a drill handle and a drill head body arranged at the front end of the drill handle. The drill head body comprises three drill edges uniformly distributed around the center line of the drill head body. The drill edges are in spiral shape. One side of the drill edge is a main cutting edge, and the other side is a groove back. The main cutting edge of one drill edge cooperates with the groove back of another drill edge to form a chip pocket. The three chip pockets are also distributed in spiral shape between the drill edges. The groove angle of the chip pocket is open V-shaped in the cross section perpendicular to the spiral line of the drill edge. Each main cutting edge forms a corresponding cross edge, and the three cross edges form a drill tip of the drill head body, and each cross edge is in arc shape.
[0006] Further, the cross section of the chip pocket is in parabolic shape.
[0007] The advantages of the utility model are as follows: the reaming drill of the utility model realizes drilling by cooperation of three drill edges, so that the feed amount is increased, drilling and polishing of hole wall are realized at the same time, similar to reaming processing, so that high-efficiency and high-precision hole processing is achieved, and the processing time is greatly shortened.
[0008] In addition, three transverse cutting edges are used to form the drill tip of the drill bit body, and each transverse cutting edge is designed in an arc shape, thus forming a specially shaped drill tip, which improves centering performance and reduces axial resistance.
[0009] The cross-sectional profile of the chip flute is parabolic, which further improves the rigidity of the drill bit and increases the chip space, which is beneficial for chip removal and reduces clogging.
[0010] When using the reaming drill of this utility model, the core thickness can be designed to be 50% thicker than that of a regular two-flute drill core, resulting in greater rigidity, better guidance, higher drilling diameter accuracy, and lower hole wall roughness. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the drilling and reaming drill of this utility model.
[0012] Figure 2 This is a schematic diagram of the chip groove in this utility model. Detailed Implementation
[0013] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.
[0014] like Figure 1 The drill shown includes a drill shank and a drill bit body 5 disposed at the front end of the drill shank.
[0015] The drill bit body 5 includes three drill cutting edges evenly distributed along the centerline of the drill bit body 5. The drill cutting edges are helical, with one side being the main cutting edge 1 and the other side being the back groove 2. The main cutting edge 1 of one drill cutting edge and the back groove 2 of another drill cutting edge work together to form a chip flute 6. The three chip flutes 6 are also helically distributed between the drill cutting edges. The groove angle of the chip flute 6 is an open V-shape on a cross-section perpendicular to the helix of the drill cutting edge. Figure 2 As shown in the schematic diagram, the cross-sectional profile of the chip groove 6 is parabolic. This parabolic profile further improves the rigidity of the drill bit and also increases the chip space, which is beneficial for chip removal and reduces clogging.
[0016] Each main cutting edge 1 has a corresponding chisel edge 3, and the three chisel edges 3 together form the drill tip 4 of the drill body 5, with each chisel edge 3 being arc-shaped. By using three chisel edges 3 to cooperate in forming the drill tip of the drill body 5, and designing each chisel edge 3 to be arc-shaped, a specially shaped drill tip is formed, which improves centering performance and reduces axial resistance.
[0017] The reaming drill is improved in the light of the weak point in the drilling of the common twist drill, three uniformly distributed drill edges are adopted to realize the drilling, and correspondingly, there are three main cutting edges 1, three cross edges 3 and three chip grooves 6 which are uniformly distributed, the structure design makes the feeding amount of the reaming drill increased, and the hole wall can be polished at the same time of the drilling, similar to the reaming processing, so that the hole processing is high in efficiency and high in precision, the processing time is greatly shortened, and based on the above structure improvement, when the drill core of the drill bit main body 5 is designed, the thickness of the drill core can be designed to be 50% thicker than that of the common two-edge drill, so that the rigidity is large, the guiding property is good, the drilling hole diameter precision is good, and the hole wall roughness is low.
[0018] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form, although the utility model has been disclosed as above with a preferred embodiment, however, it is not used to limit the utility model, any person skilled in the art can make some changes or modifications to the equivalent embodiments with the disclosed technical content without departing from the technical scheme range of the utility model, as long as it does not depart from the technical scheme content of the utility model, any modification, equivalent change and modification of the above embodiment according to the technical essence of the utility model are still within the technical scheme range of the utility model.
Claims
1. A drill for drilling and reaming holes, characterized in that: The drill bit comprises a drill shank and a drill bit body arranged at the front end of the drill shank. The drill bit body comprises three drill edges which are uniformly distributed along the center line of the drill bit body and are in a spiral shape, one side of each drill edge is a main cutting edge, and the other side is a groove back surface, the main cutting edge of one of the drill edges cooperates with the groove back surface of another drill edge to form a chip flute, and the three chip flutes are also in a spiral shape and are distributed between the drill edges, and the flute angle of the chip flute is in an open V shape in the cross section perpendicular to the spiral line of the drill edge. Each of the main cutting edges forms a corresponding cross edge, and the three cross edges form a drill tip of the drill bit body, and each cross edge is in an arc shape.
2. The drill according to claim 1, characterized in that: The cross section of the chip flute is in a parabolic shape.