Twist drill facilitating chip breaking

Abstract

The twist drill facilitating chip breaking comprises a drill bit body, the center of the end of the drill bit body extends outwards to form two main cutting edges, two chip grooves are formed along the two main cutting edges in a spiral downward mode, a cutting edge face is arranged on one side of each main cutting edge, and the side, away from the main cutting edges, of each cutting edge face is a cutting edge back. A chip breaker groove is formed in the side, away from the cutting edge face, of the main cutting edge, is in an inwards-concave arc shape and used for being matched with the grinding radian of a grinding wheel, and the chip breaker groove is used for blocking scrap iron wound in the machining process.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, and more specifically to a twist drill which is convenient for chip breaking. Background Art

[0002] When drilling, it is inevitable that chips will be generated. Whether the tool can break the chips reliably or not has a significant impact on normal production and operator safety. During the drilling process, for some long-chip processing materials, long strips of chips will wrap around the workpiece or drill bit, which can easily scratch the workpiece, cause tool damage, and even affect worker safety. Especially in the absence of internal cooling conditions for machine tools, the phenomenon of poor chip removal and iron chips scratching the hole wall during drilling is particularly serious.

[0003] The utility model patent with announcement number CN 218855698 U discloses a high-speed chip-breaking twist drill, comprising a drill body, the end of the drill body is provided with a blade back and a transverse blade chip-breaking surface, the drill body is provided with a spiral chip removal groove, and the outer wall surface of the drill body is a spiral shovel back; it also includes a water spray hole and a rolled chip-breaking groove; the water spray hole is specifically located in the middle section of the transition edge line between the blade back and the transverse blade chip-breaking surface; the rolled chip-breaking groove is located on the transverse blade chip-breaking surface, and the rolled chip-breaking groove corresponds to the position of the water spray hole; the cross-section of the rolled chip-breaking groove is an arc-shaped groove, and the rolled chip-breaking groove extends from the blade back to the chip removal groove and the spiral shovel back along the arc-shaped transverse blade chip-breaking surface.

[0004] During the drilling process of the existing twist drill, the chip breaking effect at the drill bit is poor, resulting in the chips cut by the drill bit to be long in size and difficult to be discharged through the chip groove, which will cause the undesirable phenomenon of poor chip removal. During the chip removal process, the inner wall of the hole may be scratched due to the long size.

[0005] Therefore, it is necessary to provide a twist drill that is reliable and convenient for chip breaking. Utility Model Content

[0006] In view of this, in order to solve the above problems, the utility model proposes a twist drill that is easy to break chips. The cutting edge is processed by notching to solve the problem of iron chips entanglement generated by the tool during the processing, thereby achieving good chip breaking.

[0007] A twist drill for easy chip breaking comprises a drill body 1, wherein two main cutting edges 2 are extended outward from the center of the end of the drill body 1, and two chip grooves 3 are formed spirally downward along the two main cutting edges 2, and a cutting edge face 21 is provided on one side of the main cutting edge 2, and a cutting edge back 22 is provided on the side of the cutting edge face 21 away from the main cutting edge 2. The invention is characterized in that a chip breaker groove 4 is provided on the side of the main cutting edge 2 away from the cutting edge face 21, and the chip breaker groove 4 is an arc with an inward concave groove, which is used to match the arc of grinding wheel grinding, and the chip breaker groove 4 is used to block iron chips entangled during processing.

[0008] Furthermore, the chip breaking front angle of the chip breaker groove 4 is 10° to 13°, and the chip breaking front angle ensures the cutting force of the main cutting edge 2 and prevents chipping.

[0009] Furthermore, the cutting edge of the main cutting edge 2 is divided into two sections, the cutting edge close to the drill tip section is used for centering and cutting, and the cutting edge away from the drill tip section is used for cutting and chip breaking, and the cutting edge away from the drill tip section is connected to the chip breaker groove 4.

[0010] Furthermore, a chip groove 5 is provided between the main cutting edge 2 and the back of the opposite main cutting edge 2 for cutting and rolling out iron chips. The chip groove 5 is provided with a chip curved surface 51 near the main cutting edge 2. The chip curved surface 51 extends downward from the main cutting edge 2 near the drill tip section.

[0011] Furthermore, the chip groove 5 is provided with a chip curling surface 52 away from the main cutting edge 2 . The chip curling surface 52 is in an arc shape, and there is an angle between the chip groove 51 and the chip curling surface 52 .

[0012] Furthermore, the angle of the chip curved surface 51 of the chip groove 5 is 48-55°.

[0013] Furthermore, a helical surface 6 is formed between the chip removal grooves 3, and a gap 7 is left between the chip curling surface 52 of the chip groove 5 and the edge of the helical surface 6, so that the tail of the chip groove 5 is not sharp and the chip breaking effect is ensured.

[0014] Furthermore, the distance of the gap 7 is 0.4-0.6 mm.

[0015] Furthermore, a protective blade edge 8 is provided downwardly extending from one end of the chip breaker groove 4 to protect the edge of the main cutting edge 2 and to play a lubricating role at the same time.

[0016] Furthermore, the angle of the protective blade edge 8 is 2°.

[0017] Beneficial effects of the utility model: The utility model proposes a twist drill that is easy to break chips, including a drill body 1, wherein the center of the end of the drill body 1 extends outward to form two main cutting edges 2, and two chip grooves 3 are formed spirally downward along the two main cutting edges 2, and a cutting edge surface 21 is provided on one side of the main cutting edge 2, and the side of the cutting edge surface 21 away from the main cutting edge 2 is a cutting edge back 22, characterized in that a chip breaker groove 4 is provided on the side of the main cutting edge 2 away from the cutting edge surface 21, and the chip breaker groove 4 is an arc with an inward concave groove, which is used to cooperate with the arc of grinding wheel grinding, and the chip breaker groove 4 is used to block iron chips entangled during processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a three-dimensional structural diagram of the twist drill for easy chip breaking of the utility model.

[0019] Figure 2 The utility model is a plan view of the drill bit of the twist drill which is convenient for chip breaking.

[0020] Figure 3 It is a partial three-dimensional structural diagram of the drill bit of the twist drill which is convenient for chip breaking according to the utility model.

[0021] Main component symbols

[0022] Drill body 1, main cutting edge 2, chip removal groove 3, cutting edge face 21, cutting edge back 22, chip breaker groove 4, chip containing groove 5, chip containing curved surface 51, chip curling curved surface 52, spiral surface 6, gap 7, and protective blade edge 8.

[0023] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0024] like Figure 1 As shown in FIG. 1 , it is a three-dimensional structural diagram of a twist drill for chip breaking according to the present invention; Figure 2 As shown, it is a plan view of the drill bit of the twist drill which is convenient for chip breaking of the utility model; Figure 3 As shown, it is a partial three-dimensional structural diagram of the drill bit of the twist drill for easy chip breaking of the utility model. Example

[0025] A twist drill for easy chip breaking comprises a drill body 1, wherein two main cutting edges 2 are extended outward from the center of the end of the drill body 1, and two chip grooves 3 are formed spirally downward along the two main cutting edges 2, and a cutting edge face 21 is provided on one side of the main cutting edge 2, and a cutting edge back 22 is provided on the side of the cutting edge face 21 away from the main cutting edge 2. The invention is characterized in that a chip breaker groove 4 is provided on the side of the main cutting edge 2 away from the cutting edge face 21, and the chip breaker groove 4 is an arc with an inward concave groove, which is used to match the arc of grinding wheel grinding, and the chip breaker groove 4 is used to block iron chips entangled during processing.

[0026] The chip breaking front angle of the chip breaker groove 4 is 10° to 13°, and the chip breaking front angle ensures the cutting force of the main cutting edge 2 and prevents chipping.

[0027] The cutting edge of the main cutting edge 2 is divided into two sections. The cutting edge of the section close to the drill tip is used for centering and cutting, and the cutting edge of the section away from the drill tip is used for cutting and chip breaking. The cutting edge of the section away from the drill tip is connected to the chip breaker groove 4.

[0028] A chip groove 5 is provided between the main cutting edge 2 and the back of the opposite main cutting edge 2, which is used to cut and roll out iron chips. The chip groove 5 is provided with a chip surface 51 near the main cutting edge 2. The chip surface 51 extends downward from the cutting edge of the main cutting edge 2 near the drill tip. The chip groove 5 is a chip rolling surface 52 away from the main cutting edge 2. The chip rolling surface 52 is arc-shaped, and there is an angle between the chip rolling surface 51 and the chip rolling surface 52. The angle of the chip surface 51 of the chip groove 5 is 48~55°.

[0029] A spiral surface 6 is formed between the chip removal grooves 3, and a gap 7 is left between the chip curling surface 52 of the chip groove 5 and the edge of the spiral surface 6, so that the tail of the chip groove 5 is not sharp and the chip breaking effect is guaranteed. The distance of the gap 7 is 0.4~0.6mm.

[0030] A protective edge 8 is provided at one end of the chip breaker groove 4 extending downward to protect the edge of the main cutting edge 2 and to provide lubrication. The angle of the protective edge 8 is 2°.

[0031] Beneficial effects of the utility model: The utility model proposes a twist drill that is easy to break chips, including a drill body 1, wherein the center of the end of the drill body 1 extends outward to form two main cutting edges 2, and two chip grooves 3 are formed spirally downward along the two main cutting edges 2, and a cutting edge surface 21 is provided on one side of the main cutting edge 2, and the side of the cutting edge surface 21 away from the main cutting edge 2 is a cutting edge back 22, characterized in that a chip breaker groove 4 is provided on the side of the main cutting edge 2 away from the cutting edge surface 21, and the chip breaker groove 4 is an arc with an inward concave groove, which is used to cooperate with the arc of grinding wheel grinding, and the chip breaker groove 4 is used to block iron chips entangled during processing.

[0032] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A twist drill for easy chip breaking, comprising a drill body (1), wherein two main cutting edges (2) extend outward from the center of the end of the drill body (1), and two chip grooves (3) are formed spirally downward along the two main cutting edges (2), and a cutting edge face (21) is provided on one side of the main cutting edge (2), and a cutting edge back (22) is provided on the side of the cutting edge face (21) away from the main cutting edge (2), wherein: A chip breaker groove (4) is provided on the side of the main cutting edge (2) away from the cutting edge surface (21); the chip breaker groove (4) is in the shape of an arc with an inward recess and is used to match the arc of grinding by a grinding wheel; the chip breaker groove (4) is used to block iron chips entangled during the machining process.

2. The twist drill for easy chip breaking as claimed in claim 1, characterized in that: The chip breaking front angle of the chip breaker groove (4) is 10° to 13°, and the chip breaking front angle ensures the cutting force of the main cutting edge (2) and prevents chipping.

3. The twist drill for easy chip breaking as claimed in claim 1, characterized in that: The cutting edge of the main cutting edge (2) is divided into two sections, the cutting edge of the section close to the drill tip is used for centering and cutting, and the cutting edge of the section away from the drill tip is used for cutting and chip breaking, and the cutting edge of the section away from the drill tip is connected to the chip breaker groove (4).

4. The twist drill for easy chip breaking as claimed in claim 1, characterized in that: A chip groove (5) is provided between the main cutting edge (2) and the back of the opposite main cutting edge (2), for separating and rolling out iron chips, and flowing down; a chip curved surface (51) is provided near the main cutting edge (2) of the chip groove (5); the chip curved surface (51) extends downward from the main cutting edge (2) near the drill tip section.

5. The twist drill for easy chip breaking as claimed in claim 4, characterized in that: The chip groove (5) is provided with a chip curling surface (52) away from the main cutting edge (2); the chip curling surface (52) is in the shape of an arc, and there is a folded angle between the chip groove (51) and the chip curling surface (52).

6. The twist drill for easy chip breaking as claimed in claim 4, characterized in that: The angle of the chip curved surface (51) of the chip groove (5) is 48-55°.

7. The twist drill for easy chip breaking as claimed in claim 4, characterized in that: A helical surface (6) is formed between the chip removal grooves (3), and a gap (7) is left between the chip curling surface (52) of the chip containing groove (5) and the edge of the helical surface (6), so that the tail of the chip containing groove (5) is not sharp, while ensuring the chip breaking effect.

8. The twist drill for easy chip breaking as claimed in claim 7, characterized in that: The distance of the gap (7) is 0.4-0.6 mm.

9. The twist drill for easy chip breaking as claimed in claim 1, characterized in that: One end of the chip breaker groove (4) is provided with a protective blade edge (8) extending downwards, which is used to protect the cutting edge of the main cutting edge (2) and also plays a lubricating role.

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