Multi-sharp-angle coping drill
By designing a multi-angle grinding drill and adopting a spiral drill bit and a combined cutting edge structure, the problem of wobbling and wear of traditional twist drills under high-speed rotation is solved, achieving rapid positioning and efficient drilling.
Patent Information
- Application Number
- CN202422677519.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-11-04
AI Technical Summary
Traditional twist drills are prone to wobbling at high speeds, resulting in low cutting efficiency and rapid wear of the cutting edge, which leads to reduced machining accuracy.
A multi-angle grinding drill is designed, which uses a pair of spirally distributed drill bits. The main cutting edge is composed of a combination of the first and second cutting sections, and is equipped with an open V-shaped main chip removal groove and an arc-shaped and stepped secondary chip removal groove to enhance positioning and chip removal effects.
It improves drilling speed and cutting efficiency, reduces drill bit wear, and ensures machining accuracy.
Smart Images
Figure CN223733918U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a drill bit, and more particularly to a multi-angle grinding drill. Background Technology
[0002] Twist drills have been around for over 100 years and are still widely used worldwide. The world standard twist drill and many other commonly used advanced twist drills derived from it typically have an outer cutting edge angle of 118° to 135°. Twist drills are widely used for drilling various common metals, such as flat iron, thin steel plates (including stainless steel), square tubes, angle iron, etc., with a typical thickness between 0.1 and 5.0 mm.
[0003] Traditional twist drills have maintained a relatively unchanged structure and shape for over a century since their invention. However, with the continuous development of science and technology and the emergence of new materials, new requirements are constantly being placed on drill bits. In existing technologies, the drill tip only has two cutting surfaces and cutting edges. This causes the drill bit to wobble during high-speed rotation while drilling. Furthermore, due to having only two cutting edges, the cutting efficiency is low, and the cutting edges wear quickly, which in turn leads to a reduction in machining accuracy. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a multi-angle grinding drill that can quickly position the drill bit and reduce drill bit wear.
[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a multi-angle grinding drill, the innovation of which is: it includes a pair of two drill blades symmetrically distributed with the drill axis as the line of symmetry, and the drill blades are arranged in a spiral shape;
[0006] One side of the drill bit is the main cutting edge, and the other side is the back groove. The main cutting edge of one drill bit and the back groove of the other drill bit work together to form the main chip removal groove. The groove angle of the main chip removal groove is an open V-shape on the cross section perpendicular to the drill bit helix. The area between the main cutting edge and the back groove is the back face.
[0007] The main cutting edge is a combined cutting edge composed of a first cutting segment and a second cutting segment. The endpoints of the first cutting segments of the two main cutting edges are connected. The first cutting segment and the second cutting segment are distributed in a V-shape. The inclination of the first cutting segment is greater than that of the second cutting segment. The flank face is also provided with a secondary chip removal groove corresponding to the first cutting segment and the second cutting segment. A gap is left between the secondary chip removal groove and the main cutting edge.
[0008] Furthermore, the secondary chip removal groove includes a first chip removal groove corresponding to the first cutting section and a second chip removal groove corresponding to the second cutting section;
[0009] The depth of the first chip removal groove gradually increases from the first cutting section to the back of the groove, and the width of the first chip removal groove gradually increases from the first cutting section to the back of the groove. The cross-section of the first chip removal groove is arc-shaped.
[0010] The depth of the second chip removal groove gradually increases from the second cutting section to the back of the groove, and the width of the second chip removal groove gradually increases from the second cutting section to the back of the groove. The cross-section of the second chip removal groove is stepped, consisting of a first stepped section and a second stepped section from bottom to top. Both the first stepped section and the second stepped section are isosceles trapezoidal. The lower base of the first stepped section is smaller than the upper base of the first stepped section. The lower base of the second stepped section is the same as the upper base of the first stepped section, but smaller than the upper base of the second stepped section.
[0011] The advantages of this utility model are as follows: The grinding drill of this utility model adopts a combined cutting edge structure of a first cutting segment and a second cutting segment distributed in a V-shape for a single main cutting edge, and controls the inclination of the first cutting segment and the second cutting segment, thereby enabling rapid positioning of cutting, reducing drill bit wear, and improving drilling speed.
[0012] In addition, by adding a secondary chip removal groove to cooperate with the main cutting edge, chip removal can be achieved, which can better cooperate with the combined main cutting edge and also avoid the accumulation of waste chips on the back face.
[0013] The first chip removal groove uses an arc-shaped groove design because the back face of the first chip removal groove is an inclined surface. Therefore, the arc-shaped groove can effectively remove waste chips. The second chip removal groove uses a stepped groove design because the back face of the second chip removal groove is close to a horizontal surface. Therefore, this stepped groove design is used to remove chips, improve the chip removal effect, and avoid the accumulation of waste chips. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the multi-angle grinding drill of this utility model.
[0015] Figure 2 This is a schematic diagram of the second structure of the multi-angle grinding drill of this utility model.
[0016] Figure 3 This is a schematic diagram of the third structure of the multi-angle grinding drill of this utility model. Detailed Implementation
[0017] 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.
[0018] like Figure 1 The multi-angle grinding drill shown includes a pair of two drill cutting edges 1 symmetrically distributed about the drill axis, and the drill cutting edges 1 are arranged in a spiral shape.
[0019] One side of the drill bit 1 is the main cutting edge 2, and the other side is the back groove 4. The main cutting edge 2 of one drill bit 1 and the back groove 4 of the other drill bit work together to form the main chip removal groove 3. The groove angle of the main chip removal groove 3 is an open V-shape on the cross section perpendicular to the drill bit helix. The back face is between the main cutting edge 2 and the back groove 4.
[0020] The main cutting edge 2 is a combined cutting edge composed of a first cutting segment 21 and a second cutting segment 22. The endpoints of the first cutting segments 21 of the two main cutting edges 2 are connected to form a drill tip. The first cutting segment 21 and the second cutting segment 22 are distributed in a V-shape, and the inclination of the first cutting segment 21 is greater than that of the second cutting segment 22.
[0021] The flank face corresponds to the main cutting edge 2 and is composed of a first flank face 6 and a second flank face 5. The first flank face 6 and the second flank face 5 are V-shaped, with the first flank face 6 being an inclined plane and the second flank face 5 being nearly horizontal. Secondary chip removal grooves corresponding to the first cutting section 21 and the second cutting section 22 are also formed on the flank face, and a gap is left between the secondary chip removal grooves and the main cutting edge 2. This gap between the secondary chip removal grooves and the main cutting edge 2 is to ensure the structural strength of the main cutting edge 2 and to prevent a reduction in the structural strength of the main cutting edge 2 due to the secondary chip removal grooves, which would affect the smoothness of cutting and cutting efficiency.
[0022] The secondary chip removal groove includes a first chip removal groove 7 corresponding to the first cutting section 21 and a second chip removal groove 8 corresponding to the second cutting section. The first chip removal groove 7 is disposed on the first flank face 6, and the second chip removal groove 8 is disposed on the second flank face 5. Both the first chip removal groove 7 and the second chip removal groove 8 are disposed near the contact point between the first flank face 6 and the second flank face 5, thereby preventing the accumulation of waste chips at the contact point between the first flank face 6 and the second flank face 5.
[0023] The depth of the first chip removal groove 7 gradually increases from the first cutting section 21 to the back surface of the groove 4, and the width of the first chip removal groove 7 gradually increases from the first cutting section 21 to the back surface of the groove 4. The cross-section of the first chip removal groove 7 is arc-shaped, and the arc-shaped opening of the first chip removal groove 7 faces the outside of the first flank face 6.
[0024] The depth of the second chip removal groove 8 gradually increases from the second cutting section 22 to the back surface 4 of the groove, and the width of the second chip removal groove 8 also gradually increases from the second cutting section 22 to the back surface 4 of the groove. The cross-section of the second chip removal groove 8 is stepped, consisting of a first stepped section and a second stepped section from bottom to top. Both the first and second stepped sections are isosceles trapezoidal. The lower base of the first stepped section is smaller than the upper base, while the lower base of the second stepped section is the same as and smaller than the upper base of the first stepped section. The first chip removal groove 7 uses an arc-shaped groove design because the first flank face 6 where the first chip removal groove 7 is located is an inclined surface, thus the arc-shaped groove can effectively remove chips. The second chip removal groove 8 uses a stepped groove design because the second flank face 5 where the second chip removal groove 8 is located is close to a horizontal plane, thus this stepped groove design is used to improve chip removal efficiency and prevent chip accumulation.
[0025] This utility model of a multi-angle grinding drill also has two other structures, such as... Figure 2 As shown, with Figure 1 The difference between the multi-angle grinding drill shown is that the first cutting section 21 and the second cutting section 22 are distributed in an inverted V shape, the first flank face 6 and the second flank face 5 are also distributed in an inverted V shape, and both the first flank face 6 and the second flank face 5 are inclined surfaces.
[0026] like Figure 3 Another structure shown, and Figure 1 The difference between the multi-angle grinding drill shown is that the first flank face 6 and the second flank face 5 are also distributed in an inverted V shape, and the first flank face 6 is an inclined surface, while the second flank face 5 is a spiral surface.
[0027] The grinding drill of this invention adopts a combined cutting edge structure of a first cutting section 21 and a second cutting section 22 distributed in a V-shape for a single main cutting edge, and controls the inclination of the first cutting section 21 and the second cutting section 22, thereby enabling rapid positioning of the cutting, reducing drill bit wear, and increasing drilling speed.
[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A multi-angle resharpening drill characterized by: The drill bit comprises a pair of drill edges symmetrically distributed along the drill axis; One side of the drill edge is a main cutting edge, and the other side is a groove back surface, and the main cutting edge of one drill edge cooperates with the groove back surface of the other drill edge to form a main chip flute, the groove angle of the main chip flute is an open V shape in the cross section perpendicular to the spiral line of the drill edge, and the main cutting edge and the groove back surface are connected by a relief surface; The main cutting edge is a combined edge composed of a first cutting section and a second cutting section, and the end points of the first cutting sections of the two main cutting edges are connected, the first cutting section and the second cutting section are in V-shaped distribution, and the inclination range of the first cutting section is greater than that of the second cutting section, and the relief surface is also provided with a secondary chip flute corresponding to the first cutting section and the second cutting section, and a gap is left between the secondary chip flute and the main cutting edge.
2. The multi-angle resharpening drill according to claim 1, wherein: The secondary chip flute comprises a first chip flute corresponding to the first cutting section and a second chip flute corresponding to the second cutting section; The depth of the first chip flute gradually increases from the first cutting section to the groove back surface, and the width of the first chip flute gradually increases from the first cutting section to the groove back surface, and the cross section of the first chip flute is in arc shape; The depth of the second chip flute gradually increases from the second cutting section to the groove back surface, and the width of the second chip flute gradually increases from the second cutting section to the groove back surface, and the cross section of the second chip flute is in ladder shape, and the first ladder section and the second ladder section are in isosceles trapezoidal shape from bottom to top, the size of the lower base of the first ladder section is smaller than that of the upper base of the first ladder section, and the size of the lower base of the second ladder section is consistent with that of the upper base of the first ladder section, and smaller than that of the upper base of the second ladder section.