Efficient and high-strength three-groove type drilling and milling twist drill

Abstract

According to the efficient and high-strength three-groove type drilling and milling twist drill, a drilling part is provided with three sets of front tool faces and rear tool faces, arc tool faces are arranged on the connecting edges of the front tool faces and the rear tool faces of each set in a groove mode, a sawtooth part is a spiral guide part of a drill body and comprises spiral grooves and auxiliary cutting edges, and the spiral grooves are matched with the auxiliary cutting edges. A plurality of sawteeth are arranged on the auxiliary cutting edges at equal intervals, the section shapes of the portions, on the two sides of the spiral groove, of the lead core are gradually-enlarged inclined slopes, the arc cutter face is arranged between the front cutter face and the rear cutter face, so that the chip removal angle is effectively increased, the arc cutter face is matched with the three-groove type spiral groove, and the chip removal efficiency is improved. The whole cutting efficiency and chip removal efficiency can be effectively improved, the multiple sawteeth are arranged on the auxiliary cutting edges, the side face milling function can be achieved, and therefore the multifunctional twist drill is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of twist drills, and in particular to a high-efficiency and high-strength three-slot drilling and milling twist drill. Background Art

[0002] A twist drill is a tool used to create holes in solid materials and is the most widely used type of holemaking tool. It drills circular holes in workpieces by rotating about a fixed axis. It gets its name from the spiral shape of its chip flutes, which resemble twists. Spiral flutes can have two, three, or more flutes, but two flutes are the most common. Twist drills can be clamped in manual or electric handheld drilling tools, or used in drilling machines, milling machines, lathes, and even machining centers. The drill bit is typically made of high-speed tool steel or carbide.

[0003] Twist drills are typically made from general-purpose high-speed steels W18Cr4V and W6Mo5Cr4V2. The former's poor thermoplasticity makes it unsuitable for the thermoplastic forming processes required for current drill manufacturing, such as rolling and twisting. While the latter exhibits better thermoplasticity, it is highly sensitive to decarburization and, due to its high molybdenum content, exhibits poor grindability. Furthermore, molybdenum resources in my country are relatively scarce. Therefore, improvements are needed to the existing twist drill structure to enhance its mechanical and process performance, as well as tool wear resistance. Utility Model Content

[0004] In order to solve the above problems, this paper proposes a high-efficiency and high-strength three-slot drilling and milling twist drill. The twist drill is a three-slot spiral twist drill. The twist drill consists of a drill body and a drill rod. The drill body includes a drilling part and a serrated part. The drilling part is the front end drill bit part of the drill body. The drilling part is provided with three groups of rake faces and flank faces. The groove on the connected edge of each group of rake faces and flank faces is provided with an arc knife face. The serrated part is the spiral guide part of the drill body. The serrated part includes a spiral groove and an auxiliary cutting edge. A number of serrations are equidistantly provided on the auxiliary cutting edge. The arc knife face The included angle between the inner side and the front projection of the adjacent front cutting edge is 50-55 degrees, the shape of the serrations is an equilateral triangular arc-bottom serration, the spacing between the serrations is 3-4.5 mm, and the cross-sectional shape of the lead core on both sides of the spiral groove is a gradually expanding oblique slope. By arranging an arc cutting surface between the front cutting surface and the rear cutting surface, the chip removal angle is effectively increased, and it cooperates with the three-groove spiral groove to effectively improve the overall cutting efficiency and chip removal efficiency. By arranging several serrations on the secondary cutting edge, the side milling function can also be realized, thereby realizing a multifunctional twist drill.

[0005] The drill body is a three-groove equally divided twist drill. The rear end of the drill body is connected to the drill rod in an integrated manner. The outer surface of the drill body is spirally provided with three sets of spiral grooves. By using a three-groove twist drill, the cutting is smooth and the roundness of the processed hole is sufficiently complete, thereby ensuring the processing quality.

[0006] The spiral groove is a slope-narrowing spiral groove. One end of the spiral groove is connected to the drilling part, and the other end of the spiral groove is connected to the slope of the outer surface of the drill rod with a gradually narrowing groove width. Through the gradually narrowing spiral groove, the lead core is gradually enlarged, ensuring the chip removal effect.

[0007] The cutting edge angle of the flank is 135 degrees, and the arc radius of the arc cutting surface between the flank and rake faces is the same as the outer contour radius of the drill body. Through the sufficient cutting angle and the arc cutting surface with the same radius as the drill body, the cutting efficiency can be fully improved and the cutting strength of the flank can be guaranteed.

[0008] One side edge of the arc blade is connected to the back blade through a straight edge, and the other side edge of the arc blade is connected to the front blade through an arc-shaped outward-turned edge. The arc blade can achieve an efficient cutting effect, and can also achieve a sufficient chip breaking effect during low-speed cutting, thereby fully improving the production quality of drilling.

[0009] Beneficial effects:

[0010] By setting a curved cutting edge between the rake face and the flank face to effectively increase the chip removal angle, and cooperating with the three-groove spiral groove, the overall cutting efficiency and chip removal efficiency can be effectively improved. By setting a number of serrations on the secondary cutting edge, the side milling function can also be realized, thereby realizing a multifunctional twist drill.

[0011] By using a three-slot twist drill, the cutting is smooth and the roundness of the processed hole is complete enough to ensure the processing quality.

[0012] Through the gradually narrowing spiral groove, the lead core is gradually enlarged, ensuring the chip removal effect.

[0013] Through the arc cutting edge with sufficient angle and the same radius as the drill body, the cutting efficiency can be fully improved and the cutting strength of the back cutting edge can be guaranteed.

[0014] The arc blade surface can achieve efficient cutting effect, and can also achieve sufficient chip breaking effect during low-speed cutting, fully improving the production quality of drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a main view of a high-efficiency and high-strength three-slot drilling and milling twist drill;

[0016] Figure 2This is a schematic diagram of the drilling part of a high-efficiency and high-strength three-slot drilling and milling twist drill;

[0017] Figure 3 This is a flattened cross-section of the serrations of a high-efficiency, high-strength three-slot drilling and milling twist drill.

[0018] Figure 4 This is a partial enlarged view of the teeth of a high-efficiency and high-strength three-slot drilling and milling twist drill;

[0019] In the figure; 1, drilling part, 2, serrated part, 3, back cutting edge, 4, arc cutting edge, 5, front cutting edge, 6, spiral groove, 7, serration, 8, inner side, 9, lead core. DETAILED DESCRIPTION

[0020] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0021] Drilling part 1, serration part 2, flank surface 3, arc surface 4, rake surface 5, spiral groove 6, serration 7, inner side 8, lead core 9.

[0022] like Figure 1 、 2 , 3, 4;

[0023] A high-efficiency and high-strength three-slot drilling and milling twist drill, which is a three-slot spiral twist drill. The twist drill includes a drill body and a drill rod. The drill body includes a drilling part 1 and a serrated part 2. The drilling part 1 is the front drill tip part of the drill body. The drilling part 1 is provided with three groups of rake faces 5 and flank faces 3. The connected edges of each group of rake faces 5 and flank faces 3 are grooved with arc faces 4. The serrated part 2 is a spiral guide part of the drill body. The serrated part 2 includes a spiral groove 6 and a secondary cutting edge. A plurality of serrations 7 are equidistantly provided on the secondary cutting edge. The inner side edge 8 of the arc face 4 and the front projection angle of the adjacent rake face 5 edge are 50-55 degrees. The shape of the serration 7 is an equilateral triangular arc-bottom serration 7. The spacing between the teeth 7 is 3-4.5 mm. The cross-sectional shape of the lead core 9 on both sides of the spiral groove 6 is a gradually expanding oblique slope. The drill body is a three-groove equally divided twist spiral drill. The rear end of the drill body is connected to the drill rod in an integrated manner. The outer surface of the drill body is spirally provided with three groups of spiral grooves 6. The spiral grooves 6 are spiral grooves 6 with narrowed slopes. One end of the spiral groove 6 is connected to the drilling part 1, and the other end of the spiral groove 6 is connected to the transition of the outer surface slope of the drill rod with a gradually narrowing groove width. The edge angle of the flank face 3 is 135 degrees. The arc radius of the arc blade face 4 between the flank face 3 and the rake face 5 is the same as the outer contour radius of the drill body. One side edge of the arc blade face 4 is connected to the flank face 3 through a straight edge, and the other side edge of the arc blade face 4 is connected to the rake face 5 through an arc outward-turned edge.

[0024] Implementation examples;

[0025] During drilling, the drilling portion 1 is formed by the flank face 3, the curved face 4 and the rake face 5, thereby achieving an efficient straight drilling effect. After drilling is completed, the serrations 7 provided on the secondary cutting edge can also be used to achieve an outer milling effect, while the gradually narrowing lead core 9 ensures a chip removal effect during the milling process.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-efficiency and high-strength three-slot drilling and milling twist drill, the twist drill is a three-slot spiral twist drill, the twist drill includes a drill body and a drill rod, and is characterized in that: The drill body includes a drilling part and a serration part. The drilling part is the front end drill tip part of the drill body. The drilling part is provided with three groups of rake faces and flank faces. The connected edges of the rake faces and flank faces of each group are grooved with arc blades. The serration part is the spiral guide part of the drill body. The serration part includes a spiral groove and a secondary cutting edge. A plurality of serrations are equidistantly provided on the secondary cutting edge. The angle between the inner side of the arc blade and the front projection of the adjacent rake face edge is 50-55 degrees. The shape of the serration is an equilateral triangular arc-bottom serration. The spacing between the serrations is 3-4.5 mm. The cross-sectional shape of the lead core on both sides of the spiral groove is a gradually expanding oblique slope.

2. The high-efficiency and high-strength three-slot drilling and milling twist drill according to claim 1, characterized in that: The drill body is a three-groove equally divided twist auger, the rear end of the drill body is connected to the drill rod in an integrated manner, and the outer surface of the drill body is spirally provided with three groups of spiral grooves.

3. The high-efficiency and high-strength three-slot drilling and milling twist drill according to claim 1, characterized in that: The spiral groove is a slope-narrowing spiral groove, one end of the spiral groove is connected to the drilling part, and the other end of the spiral groove is connected to the outer surface slope of the drill rod with a gradually narrowing groove width.

4. The high-efficiency and high-strength three-slot drilling and milling twist drill according to claim 1, characterized in that: The edge angle of the flank face is 135 degrees, and the arc radius of the arc face between the flank face and the rake face is the same as the outer contour radius of the drill body.

5. The high-efficiency and high-strength three-slot drilling and milling twist drill according to claim 1, characterized in that: One side edge of the arc blade surface is connected to the back blade surface through a straight edge, and the other side edge of the arc blade surface is connected to the front blade surface through an arc outward-turned edge.

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