Improved woodworking through hole drill bit
By improving the four-flute structure and double chip flute design of the woodworking through-hole drill bit, the problems of tool wear and hole wall roughness are solved, resulting in more efficient board processing and lower costs.
Patent Information
- Application Number
- CN202422489227.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-10-15
AI Technical Summary
Existing woodworking through-hole drill bits are prone to tool wear and increased hole wall roughness when the processing speed is too high, which affects processing quality and cost.
A unique four-blade structure was designed, including two main cutting edges, two first secondary cutting edges, and two second secondary cutting edges. Combined with double main chip removal grooves and double secondary chip removal grooves, the cutting edge design was optimized to disperse cutting resistance and improve chip removal efficiency.
It extends the tool's lifespan, improves the smoothness of the hole wall and machining quality, reduces the tool temperature, and avoids tool burning.
Smart Images
Figure CN223617907U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drill bit technology, specifically, to an improved woodworking through-hole drill bit. Background Technology
[0002] Modern furniture manufacturing often requires a combination of cutting tools, with drill bits being frequently used. Drill bits are broadly categorized into blind hole and through hole drills. Currently available through hole drills typically feature a two-flute design for both the cutting edge and chip flute. In actual processing, this results in relatively low tool efficiency. Excessive processing speed leads to difficulties in chip removal, increased friction between the tool and the board, and consequently, tool temperature rise, causing damage and impacting the quality of the drilled holes and increasing tool usage costs. Furthermore, the two-flute design principle leads to increased hole roughness with increasing processing speed, severely affecting the overall quality of the processed board. Utility Model Content
[0003] The purpose of this utility model is to provide an improved woodworking through-hole drill bit to solve the problem that excessive processing speed during board processing can easily cause tool wear and lead to chipping at the hole opening.
[0004] This utility model is achieved through the following technical solution: an improved woodworking through-hole drill bit, comprising a shank, a rod, and a head, wherein the head is connected to the rod, the rod is connected to the shank, two main chip removal grooves are symmetrically arranged on the head, and two symmetrical main cutting edges are arranged on the main chip removal grooves of the head.
[0005] The head has two symmetrical secondary chip removal grooves between the two main chip removal grooves; at the connection between the main cutting edge and the maximum outer diameter of the head, two first secondary cutting edges symmetrical about the central axis of the shank are machined; at the connection between the secondary chip removal groove and the maximum outer diameter of the head, two second secondary cutting edges symmetrical about the central axis of the shank are machined, and the connection points of the second secondary cutting edges and the maximum outer diameter of the head and the connection points of the first secondary cutting edges and the maximum outer diameter of the head are on the same circumference.
[0006] Two central guide positioning grooves symmetrical about the central axis of the shank are provided at the top of the head. Two arc-shaped chip removal guide blades symmetrical about the central axis of the shank are provided within the relative angle between the central guide positioning grooves and the main cutting edge.
[0007] To better realize this utility model, the rod is further provided with two main chip removal grooves symmetrically arranged, and the main chip removal grooves on the rod are connected with the main chip removal grooves on the head to form a complete main chip removal channel; the rod is provided with two symmetrical secondary chip removal grooves between the two main chip removal grooves, and the secondary chip removal grooves on the rod are connected with the secondary chip removal grooves on the head to form a complete secondary chip removal channel.
[0008] To better realize this utility model, the relative angle between the main chip removal groove and the secondary chip removal groove is α, and the range of α is 60°-75°.
[0009] To better realize this utility model, the angle formed by the first secondary cutting edge and the central axis of the shank is b, and the angle formed by the second secondary cutting edge and the central axis of the shank is c, where c is equal to b, and b is in the range of 10°-18°.
[0010] To better realize this utility model, the length of the main cutting edge is L, the length of the first secondary cutting edge is L1, the length of the second secondary cutting edge is L2, and the ratio of L:L1:L2 is 5:3:2.
[0011] To better realize this utility model, the rod and the head are integrally formed, the rod is welded to the handle, the handle is made of steel, and the rod and the head are made of alloy materials.
[0012] To better realize this utility model, the rod and handle are integrally formed, the head is welded to the rod, the handle and rod are made of steel, and the head is made of alloy material.
[0013] Compared with the prior art, this utility model has the following advantages and beneficial effects:
[0014] (1) By setting two unique first and second cutting edges, this utility model can effectively disperse the resistance of the cutting edge when the tool is processed to the edge of the hole, reduce the friction frequency between a single edge and the plate under the same cutting time, and make the cutting edge service life longer. In addition, the design of four cutting edges can make the hole wall smoother and improve the processing quality.
[0015] (2) By setting up double main chip removal grooves and double auxiliary chip removal grooves, this utility model can better and faster remove the waste chips generated during the drilling of the plate, reduce the friction coefficient between the tool and the plate, and keep the tool temperature within a certain range during the processing, so that the tool will not burn due to excessive temperature. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of a standard through-hole drill bit.
[0017] Figure 2 This is a schematic diagram of the overall structure of this utility model.
[0018] Figure 3 This is a cross-sectional view of the handle structure.
[0019] Figure 4 This is a sectional view of the handle and rod structure.
[0020] Figure 5 This is a schematic diagram of the handle and shaft structure.
[0021] Figure 6 This is a top-down view of the head structure.
[0022] Figure 7 This is a schematic diagram of the second cutting edge structure.
[0023] Figure 8 This is a schematic diagram of the first set of cutting edges.
[0024] Wherein: Ⅰ-shank; Ⅱ-shank; Ⅲ-head; 1-main chip removal groove; 2-secondary chip removal groove; 3-main cutting edge; 4-first secondary cutting edge; 5-secondary cutting edge; 6-center guide positioning groove; 7-arc chip removal guide strip. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0027] Example 1:
[0028] This embodiment provides an improved woodworking through-hole drill bit, specifically as follows: Figure 1 The device includes a shank I, a rod II, and a head III. The head III is connected to the rod II, and the rod II is connected to the shank I. The head III has two main chip removal grooves symmetrically arranged, and the head III has two symmetrical main cutting edges 3 arranged on the main chip removal grooves.
[0029] like Figure 2As shown, the head III has two symmetrical secondary chip removal grooves between the two main chip removal grooves; at the connection between the main cutting edge 3 and the maximum outer diameter of the head III, two first secondary cutting edges 4 are machined symmetrical about the central axis of the shank I; at the connection between the secondary chip removal groove and the maximum outer diameter of the head III, two second secondary cutting edges 5 are machined symmetrical about the central axis of the shank I, and the connection between the second secondary cutting edges 5 and the maximum outer diameter of the head III and the connection between the first secondary cutting edges 4 and the maximum outer diameter of the head III are on the same circumference.
[0030] Two central guide positioning grooves 6 are provided on the top of the head III, symmetrical about the central axis of the shank I. Two arc-shaped chip removal guide blades 7 are provided in the relative angle position between the central guide positioning grooves 6 and the main cutting edge 3, symmetrical about the central axis of the shank I.
[0031] The shank I is fixed to the spindle of the equipment using a clamp. When the equipment is started, the spindle drives the cutting tool to rotate synchronously. When machining sheet metal, the center of the hole to be machined is first fixed by the center guide positioning groove 6. As the cutting tool gradually advances, most of the chips in the hole to be machined are cut off by the main cutting edge 3. Most of the chips are discharged directly from the main chip removal groove through the main cutting edge 3, and a very small portion is discharged into the main chip removal groove through the arc-shaped chip removal guide edge band 7. Finally, the first secondary cutting edge 4 and the second secondary cutting edge 5 simultaneously complete the final drilling process, and the chips generated are simultaneously removed by the main chip removal groove and the secondary chip removal groove.
[0032] Example 2:
[0033] This embodiment is a further extension of Embodiment 1, specifically as follows: Figure 2 As shown, two main chip removal grooves are symmetrically arranged on the rod part II. The main chip removal grooves on the rod part II are connected with the main chip removal grooves on the head III to form a complete main chip removal channel 1. Two symmetrical secondary chip removal grooves are respectively arranged between the two main chip removal grooves on the rod part II. The secondary chip removal grooves on the rod part II are connected with the secondary chip removal grooves on the head III to form a complete secondary chip removal channel 2.
[0034] By setting a main chip removal groove and a secondary chip removal groove on the rod part II, and cooperating with the main chip removal groove and the secondary chip removal groove on the head III to form a main chip removal channel 1 and a secondary chip removal channel 2, the overall length of the chip removal groove is extended, which facilitates the discharge of chips and avoids blockage.
[0035] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.
[0036] Example 3:
[0037] This embodiment is a further extension of Embodiment 1, specifically as follows: Figure 6As shown, the relative angle between the main chip removal groove and the secondary chip removal groove is α, which ranges from 60° to 75°. The main and secondary chip removal grooves distributed at this angle are more conducive to the removal of waste chips generated during machining and to the circumferential distribution of the main cutting edge 3, the first secondary cutting edge 4, and the second secondary cutting edge 5 processed on them.
[0038] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.
[0039] Example 4:
[0040] This embodiment is a further extension of Embodiment 1, specifically as follows: Figure 7 , Figure 8 As shown, the angle between the first secondary cutting edge 4 and the central axis of the shank I is b, and the angle between the second secondary cutting edge 5 and the central axis of the shank I is c. c is equal to b, and b ranges from 10° to 18°. By setting this angle, the tool resistance will be lower during machining, the cutting will be smoother, and the machining quality will be better.
[0041] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.
[0042] Example 5:
[0043] This embodiment is a further extension of Embodiment 1, specifically as follows: Figure 7 , Figure 8 As shown, the length of the main cutting edge 3 is L, the length of the first secondary cutting edge 4 is L1, and the length of the second secondary cutting edge 5 is L2, with L:L1:L2 equal to 5:3:2. This ratio setting results in less tool resistance, smoother cutting, and better machining quality during processing.
[0044] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.
[0045] Example 6:
[0046] This embodiment is a further extension of Embodiment 1, specifically as follows: Figures 3-4 As shown, the rod part II and the head part III are integrally formed. The rod part II is welded to the handle part I. The handle part I is made of steel, while the rod part II and the head part III are made of alloy materials.
[0047] A flat-bottomed hole with a diameter of D is machined on the shank I, and the diameter of the rod II is D1, where D and D1 are the same size, both ranging from 2mm to 12mm. In this design, the main chip removal groove 1 and the secondary chip removal groove 2 can be machined in one go, and then the rod II and the shank I are welded together.
[0048] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.
[0049] Example 7:
[0050] This embodiment is a further extension of Embodiment 1, specifically as follows: Figure 5 As shown, the rod part II and the handle part I are integrally formed, and the head part III is welded to the rod part II. The handle part I and the rod part II are made of steel, and the head part III is made of alloy material.
[0051] In this scheme, the main chip removal groove and the secondary chip removal groove need to be machined on the rod part II and the head part III respectively, and then the rod part II and the head part III are welded together; only the head part III is made of alloy material, which can reduce the use of alloy material and reduce costs.
[0052] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.
[0053] 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. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.
Claims
1. An improved woodworking through-hole drill bit, comprising a shank (Ⅰ), a shank (Ⅱ), and a head (Ⅲ), wherein the head (Ⅲ) is connected to the shank (Ⅱ), the shank (Ⅱ) is connected to the shank (Ⅰ), and two main chip removal grooves are symmetrically arranged on the head (Ⅲ), and two symmetrical main cutting edges (3) are arranged on the main chip removal grooves of the head (Ⅲ), characterized in that: The head (III) has two symmetrical secondary chip removal grooves between the two main chip removal grooves; at the connection between the main cutting edge (3) and the maximum outer diameter of the head (III), two first secondary cutting edges (4) symmetrical about the central axis of the shank (I) are machined; at the connection between the secondary chip removal groove and the maximum outer diameter of the head (III), two second secondary cutting edges (5) symmetrical about the central axis of the shank (I) are machined, and the connection between the second secondary cutting edge (5) and the maximum outer diameter of the head (III) and the connection between the first secondary cutting edge (4) and the maximum outer diameter of the head (III) are on the same circumference; Two central guide positioning grooves (6) symmetrical about the central axis of the shank (I) are provided on the top of the head (III). Two arc-shaped chip removal guide blades (7) symmetrical about the central axis of the shank (I) are provided within the relative angle between the central guide positioning grooves (6) and the main cutting edge (3).
2. The improved woodworking through-hole drill bit according to claim 1, characterized in that: Two main chip removal grooves are symmetrically arranged on the rod (II). The main chip removal grooves on the rod (II) are connected to the main chip removal grooves on the head (III) to form a complete main chip removal channel (1). Two symmetrical secondary chip removal grooves are arranged between the two main chip removal grooves on the rod (II). The secondary chip removal grooves on the rod (II) are connected to the secondary chip removal grooves on the head (III) to form a complete secondary chip removal channel (2).
3. An improved woodworking through-hole drill bit according to claim 1 or 2, characterized in that: The relative angle between the main chip removal groove and the auxiliary chip removal groove is α, and the range of α is 60°-75°.
4. The improved woodworking through-hole drill bit according to claim 1, characterized in that: The angle between the first secondary cutting edge (4) and the central axis of the shank (I) is b, and the angle between the second secondary cutting edge (5) and the central axis of the shank (I) is c. c is equal to b, and b ranges from 10° to 18°.
5. The improved woodworking through-hole drill bit according to claim 1, characterized in that: The length of the main cutting edge (3) is L, the length of the first secondary cutting edge (4) is L1, the length of the second secondary cutting edge (5) is L2, and the ratio of L:L1:L2 is 5:3:
2.
6. The improved woodworking through-hole drill bit according to claim 1, characterized in that: The rod (II) and the head (III) are integrally formed. The rod (II) is welded to the handle (I). The handle (I) is made of steel, and the rod (II) and the head (III) are made of alloy materials.
7. The improved woodworking through-hole drill bit according to claim 1, characterized in that: The rod (II) and the handle (I) are integrally formed, and the head (III) is welded to the rod (II). The handle (I) and the rod (II) are made of steel, and the head (III) is made of alloy material.