Cross-shaped tool bit

Abstract

The utility model discloses a cross-shaped tool bit which comprises a main tool bit and an auxiliary tool bit integrally formed with the main tool bit, an auxiliary inclined cutting edge and an auxiliary flat cutting edge which are connected with each other are arranged on the auxiliary tool bit, a second round corner is arranged on one side of the auxiliary inclined cutting edge, and a first round corner is arranged on one side of the auxiliary flat cutting edge. A first auxiliary tail cutting edge and a second auxiliary tail cutting edge are arranged at the two ends of the auxiliary tool bit respectively and connected with the auxiliary flat cutting edge, a main inclined cutting edge, a main flat cutting edge and a main tail cutting edge are sequentially arranged on the main tool bit, and the main inclined cutting edge, the main flat cutting edge and the main tail cutting edge are connected with one another; according to the utility model, the distribution of force applied to the auxiliary flat cutting edge and the auxiliary inclined cutting edge is more uniform, so that larger force can be borne, the auxiliary inclined cutting edge and the auxiliary flat cutting edge are not easy to break, and the contact area can be increased by the second fillet and the first fillet, so that the main inclined cutting edge and the main flat cutting edge can bear more force; the crushing probability of the main inclined blade and the main flat blade is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, in particular to a cross cutter head. Background Art

[0002] The function of the cross cutter head is to be fixed at the end of the drill pipe. The electric drill rotates the cross cutter head through the drill pipe for cutting operation. It usually includes a main cutting edge and a secondary cutting edge. The main cutting edge plays a main cutting role, and the secondary cutting edge plays an auxiliary cutting role.

[0003] The main cutting edge and the secondary cutting edge of the existing cross cutter head are usually relatively sharp, and the force received is relatively concentrated. When cutting against a hard object, it is easy to break. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a cross cutter head to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A cross cutter head includes a main cutter head and a secondary cutter head integrally formed with the main cutter head. The secondary cutter head is provided with a secondary inclined cutting edge and a secondary flat cutting edge connected to each other. A second fillet is provided on one side of the secondary inclined cutting edge, and a first fillet is provided on one side of the secondary flat cutting edge. First secondary tail cutting edges and second secondary tail cutting edges are respectively provided at both ends of the secondary cutter head. The first secondary tail cutting edge and the second secondary tail cutting edge are both connected to the secondary flat cutting edge. The main cutter head is sequentially provided with a main inclined cutting edge, a main flat cutting edge and a main tail cutting edge, and the main inclined cutting edge, the main flat cutting edge and the main tail cutting edge are connected to each other.

[0006] As a preferred scheme of the utility model, the secondary flat cutting edge and the main flat cutting edge are horizontally arranged.

[0007] As a preferred scheme of the utility model, a chip removal groove is provided between the main cutter head and the secondary cutter head.

[0008] As a preferred scheme of the utility model, a second inner fillet is provided between the chip removal groove and the main cutter head, and a first inner fillet is provided between the chip removal groove and the secondary cutter head.

[0009] As a preferred scheme of the utility model, a side cutting edge is provided on the outer side of the main cutter head.

[0010] Compared with the prior art, the beneficial effects of the utility model are: By the settings of the utility model, the force received by the secondary flat cutting edge and the secondary inclined cutting edge is more evenly distributed, so that a greater force can be borne, making the secondary inclined cutting edge and the secondary flat cutting edge not easy to break. And the second fillet and the first fillet can increase the contact area, can bear more force for the main inclined cutting edge and the main flat cutting edge, and reduce the probability of the main inclined cutting edge and the main flat cutting edge breaking. Brief Description of the Drawings

[0011] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0012] Figure 2 is a top view of the present utility model;

[0013] Figure 3 is a front view of the present utility model.

[0014] In the figure: 1, main cutting head; 2, secondary cutting head; 3, secondary inclined cutting edge; 4, secondary flat cutting edge; 5, first secondary tail cutting edge; 6, second secondary tail cutting edge; 7, first rounded corner; 8, second rounded corner; 9, main inclined cutting edge; 10, main flat cutting edge; 11, main tail cutting edge; 12, side cutting edge; 13, first inner rounded corner; 14, second inner rounded corner; 15, chip removal groove. Specific embodiments

[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0016] Please refer to Figures 1 to 3, the present utility model provides a technical solution: a cross-shaped cutting head, including a main cutting head 1 and a secondary cutting head 2 integrally formed with the main cutting head 1. The secondary cutting head 2 is provided with a secondary inclined cutting edge 3 and a secondary flat cutting edge 4 that are connected to each other. The secondary inclined cutting edge 3 and the secondary flat cutting edge 4 are used to assist the main inclined cutting edge 9 and the main flat cutting edge 10 in cutting. One side of the secondary inclined cutting edge 3 is provided with a second rounded corner 8, and the angle of the second rounded corner 8 gradually decreases from top to bottom along the distribution path of the secondary inclined cutting edge 3. Since when the cutting head first contacts an object, due to the relatively small contact area, the local pressure will be relatively large. At this time, if the feed speed is too fast or the applied axial pressure is too large, it may cause damage to the secondary inclined cutting edge 3. Therefore, the angle of the end of the second rounded corner 8 on the secondary inclined cutting edge 3 that first contacts the object is set to be the largest, so that it can withstand greater pressure and reduce the probability of the secondary inclined cutting edge 3 breaking. One side of the secondary flat cutting edge 4 is provided with a first rounded corner 7. By setting the first rounded corner 7 and the second rounded corner 8, the forces received by the secondary flat cutting edge 4 and the secondary inclined cutting edge 3 are more evenly distributed, so that they can withstand greater forces, making the secondary inclined cutting edge 3 and the secondary flat cutting edge 4 not easily break. And the second rounded corner 8 and the first rounded corner 7 can increase the contact area, can bear more forces for the main inclined cutting edge 9 and the main flat cutting edge 10, and reduce the probability of the main inclined cutting edge 9 and the main flat cutting edge 10 breaking. The two ends of the secondary cutting head 2 are respectively provided with a first secondary tail cutting edge 5 and a second secondary tail cutting edge 6. By providing the two cutting edges of the first secondary tail cutting edge 5 and the second secondary tail cutting edge 6, the number of cutting edges is increased. Not only can the probability of the first secondary tail cutting edge 5 and the second secondary tail cutting edge 6 breaking be reduced, but also the cutting efficiency can be improved. The first secondary tail cutting edge 5 and the second secondary tail cutting edge 6 are both connected to the secondary flat cutting edge 4. The main cutting head 1 is successively provided with a main inclined cutting edge 9, a main flat cutting edge 10 and a main tail cutting edge 11. One side of the main inclined cutting edge 9, the main flat cutting edge 10 and the main tail cutting edge 11 is a sharp surface, which plays a main cutting role, and the main inclined cutting edge 9, the main flat cutting edge 10 and the main tail cutting edge 11 are connected to each other.

[0017] Among them, the secondary flat cutting edge 4 and the main flat cutting edge 10 are horizontally arranged.

[0018] Among them, a chip removal groove 15 is provided between the main cutting head 1 and the secondary cutting head 2. The chip removal groove 15 is used for chip removal to prevent cutting chips from accumulating on the main cutting head 1 and the secondary cutting head 2 and affecting the cutting efficiency.

[0019] Among them, a second inner rounded corner 14 is provided between the chip removal groove 15 and the main cutting head 1, and a first inner rounded corner 13 is provided between the chip removal groove 15 and the secondary cutting head 2. By providing the first inner rounded corner 13 and the second inner rounded corner 14, there are no sharp corners at the connection of the chip removal groove 15 with the main cutting head 1 and the secondary cutting head 2, which can effectively disperse stress and make the stress distribution more uniform. Therefore, the stress will not be overly concentrated at a certain point or a small area, thereby improving the structural strength and making chip removal smoother.

[0020] Among them, a side cutting edge 12 is provided on the outer side of the main cutting head 1, and the side cutting edge 12 is used for cutting the side surface to improve the cutting efficiency.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0022] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one of such features.

[0023] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "set", "connected", "fixed", "swivelly connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cross-shaped cutter head, comprising a main cutter head (1) and a secondary cutter head (2) integrally formed with the main cutter head (1), characterized in that: The secondary cutting head (2) is provided with a secondary inclined cutting edge (3) and a secondary flat cutting edge (4) which are connected to each other. A second rounded corner (8) is provided on one side of the secondary inclined cutting edge (3), and a first rounded corner (7) is provided on one side of the secondary flat cutting edge (4). First secondary tail cutting edges (5) and second secondary tail cutting edges (6) are respectively provided at both ends of the secondary cutting head (2). The first secondary tail cutting edges (5) and the second secondary tail cutting edges (6) are both connected to the secondary flat cutting edge (4). A main inclined cutting edge (9), a main flat cutting edge (10) and a main tail cutting edge (11) are successively provided on the main cutting head (1), and the main inclined cutting edge (9), the main flat cutting edge (10) and the main tail cutting edge (11) are connected to each other.

2. The cross cutter head according to claim 1, characterized in that: The secondary flat cutting edge (4) and the main flat cutting edge (10) are horizontally arranged.

3. A cross-shaped cutter head according to claim 1, characterized in that: A chip discharge groove (15) is provided between the main cutting head (1) and the secondary cutting head (2).

4. The cross cutter head according to claim 3, characterized in that: A second inner rounded corner (14) is provided between the chip discharge groove (15) and the main cutting head (1), and a first inner rounded corner (13) is provided between the chip discharge groove (15) and the secondary cutting head (2).

5. A cross-shaped cutter head according to claim 1, characterized in that: A side cutting edge (12) is provided on the outer side of the main cutting head (1).

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