Twist drill with replaceable tool bit

Abstract

The twist drill with the replaceable tool bit comprises a tool bar and the tool bit, the tool bit is connected with a tool guide bar through a long bolt, a liquid outlet hole is formed in the tool bit, anti-rotation high-low teeth are arranged between the tool bit and the tool bar, and an anti-rotation buckle is arranged between the tool bar and a screw. When the cutting edge of the tool bit is abraded or damaged, the tool bit can be taken down from the tool bar by detaching the long bolt. After a new tool bit is replaced, mounting and cutting operation are carried out again, so that the twist drill has higher flexibility and maintainability, the worn or damaged tool bit is convenient to replace, the flow channel arranged in the tool bar is communicated with the liquid outlet hole in the tool bit, and cooling liquid or lubricant is allowed to enter the liquid outlet hole through the flow channel and directly act on a cutting area. Therefore, the temperature in the cutting process is reduced, the abrasion of the tool bit is reduced, the cutting efficiency is improved, and the service life of the tool bit is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of twist drills, in particular to a twist drill with a replaceable cutter head. Background Art

[0002] In the process of metal cutting, the twist drill is one of the commonly used tools. The Chinese utility model patent application number is CN201320419751.8. The proposed twist drill with replaceable blades includes a twist drill rod, a transverse blade installation groove is opened between the top notches of the two spiral chip grooves of the drill rod, a cylindrical positioning pin higher than the bottom surface of the installation groove is provided between the two chip grooves in the center of the drill rod, a threaded locking hole is provided on the two side walls of the installation groove, a replaceable blade is installed in the installation groove, the upper end face of the blade is a drill tip blade, a rectangular groove matching the positioning pin is opened in the center of the bottom of the blade, and tapered holes corresponding to the locking holes are provided on both sides of the blade.

[0003] However, there are some shortcomings in the existing twist drills that need to be improved. After long-term use, the cutter head of the existing twist drills is easily worn, resulting in reduced cutting efficiency and unstable cutting quality. In addition, the traditional twist drills lack effective cooling means during the cutting process, which causes the temperature of the cutter head to rise rapidly, further aggravating the wear of the cutter head. Therefore, we make improvements to this and propose a twist drill with a replaceable cutter head. Utility Model Content

[0004] The purpose of the utility model is to solve the problems in the existing background technology. In order to achieve the above-mentioned purpose of the utility model, the utility model provides the following technical solutions: a twist drill with a replaceable cutter head, comprising a cutter bar and a cutter head, the cutter head and the guide bar are connected by a long bolt, a liquid outlet is provided on the cutter head, anti-rotation high and low teeth are provided between the cutter head and the cutter bar, and an anti-rotation buckle is provided between the cutter bar and the screw.

[0005] As a preferred technical solution of the utility model, a flow channel is arranged in the knife rod, and the flow channel is communicated with the liquid outlet hole arranged on the knife head.

[0006] As a preferred technical solution of the utility model, the tool head includes a straight shank tool head and a tapered shank tool head.

[0007] As a preferred technical solution of the utility model, the end face of the cutter head is provided with a cutting edge.

[0008] As a preferred technical solution of the utility model, a spiral chip removal groove is provided next to the cutting edge of the end face of the cutter head.

[0009] As a preferred technical solution of the utility model, the diameter range of the knife rod is: 6mm-10mm, and the diameter range of the flow channel is 2mm-4mm.

[0010] As a preferred technical solution of the utility model, the cutter head is made of hard alloy diamond.

[0011] As a preferred technical solution of the present utility model, 2-3 liquid outlet holes are provided.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] When the cutting edge of the cutter head is worn or damaged, the cutter head can be removed from the cutter bar by removing the long bolt. After replacing the new cutter head, reinstall and cut the work, making the twist drill more flexible and maintainable, and convenient for replacing the worn or damaged cutter head.

[0014] The flow channel set in the tool bar is connected to the liquid outlet hole on the tool head, allowing coolant or lubricant to enter the liquid outlet hole through the flow channel and directly act on the cutting area. This not only reduces the temperature during the cutting process and reduces the wear of the tool head, but also improves the cutting efficiency and extends the service life of the tool head.

[0015] During the cutting process, the generated chips are guided and discharged by the spiral chip flute. The design of the chip flute ensures that the chips can be discharged smoothly to avoid blockage and affect the cutting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure provided by the utility model;

[0017] Figure 2 A schematic diagram of the liquid outlet structure provided by the utility model;

[0018] Figure 3 A schematic diagram of the chip removal groove structure provided by the utility model;

[0019] Figure 4 A schematic diagram of the flow channel structure provided by the utility model;

[0020] Figure 5 A schematic diagram of the high and low gear structure provided by the utility model;

[0021] Figure 6 This is a schematic diagram of the screw structure provided by the utility model.

[0022] Indicated in the figure:

[0023] 1. Tool bar; 2. Tool head; 3. Guide bar; 4. High and low teeth; 5. Screw; 6. Anti-rotation buckle; 7. Flow channel; 8. Liquid outlet; 9. Cutting edge; 10. Chip groove. DETAILED DESCRIPTION

[0024] To make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments.

[0025] Therefore, the following detailed description of the embodiments of the utility model is not intended to limit the scope of the utility model for which protection is sought, but merely represents some embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. It should be noted that the embodiments of the utility model and the features and technical solutions in the embodiments can be combined with each other without conflict. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0026] Example 1: Please refer to Figure 1-Figure 6 A twist drill with replaceable cutter head comprises a cutter bar 1 and a cutter head 2. The cutter head 2 is connected to a guide cutter bar 3 by a long bolt. A liquid outlet 8 is provided on the cutter head 2. The liquid outlet 8 is provided with 2-3 holes. An anti-rotation high and low tooth 4 is provided between the cutter head 2 and the cutter bar 1. An anti-rotation buckle 6 is provided between the cutter bar 1 and a screw rod 5. The diameter range of the cutter bar 1 is: 6mm-10mm.

[0027] A flow channel 7 is arranged in the tool bar 1, and the diameter of the flow channel 7 ranges from 2 mm to 4 mm. The flow channel 7 is connected to a liquid outlet 8 arranged on the tool head 2. The tool head 2 includes a straight shank tool head 2 and a tapered shank tool head 2. The tool head 2 is made of hard alloy steel.

[0028] The end face of the cutter head 2 is provided with a cutting edge 9. A spiral chip removal groove 10 is provided beside the cutting edge 9 of the end face of the cutter head 2.

[0029] The design of connecting the shank 1 and the cutter head 2 with a long bolt allows the cutter head 2 to be replaced conveniently and quickly. This design greatly improves the flexibility of the twist drill, enabling it to adapt to different processing requirements and material properties, thereby improving work efficiency and processing quality.

[0030] The flow channel 7 provided in the tool bar 1 is connected to the liquid outlet 8 on the tool head 2, allowing the coolant or lubricant to enter the liquid outlet 8 through the flow channel 7 and directly act on the cutting area. This not only reduces the temperature during the cutting process and reduces the wear of the tool head 2, but also improves the cutting efficiency and prolongs the service life of the tool head 2.

[0031] The cutter head 2 is divided into two types: a straight shank cutter head 2 and a tapered shank cutter head 2. The appropriate cutter head 2 type can be selected according to different processing requirements. In addition, the cutting edge 9 and the spiral chip groove 10 provided on the end face of the cutter head 2 can effectively remove the chips in the cutting process and ensure the smooth progress of the cutting process.

[0032] The high and low teeth 4 and the anti-rotation buckle 6 provided between the cutter head 2 and the cutter rod 1 ensure the stability of the cutter head 2 during high-speed rotation and avoid machining errors and damage to the cutter head 2 due to vibration.

[0033] By using hard alloy steel to make the cutter head 2, the cutter head 2 has higher hardness and wear resistance, can maintain stable cutting performance during high-speed cutting, and further improves the service life and processing quality of the twist drill.

[0034] The number of the outlet holes 8 is designed to be 2-3, which ensures that the coolant or lubricant can act evenly and fully on the cutting area, further improving the cooling and lubricating effect. At the same time, this design also avoids the waste of coolant or lubricant caused by too many outlet holes 8.

[0035] The utility model works during use

[0036] Installation of cutter head 2: Connect cutter head 2 to cutter bar 1 through long bolts to ensure a firm connection between cutter head 2 and cutter bar 1.

[0037] During the connection process, the high and low teeth 4 and the anti-rotation buckle 6 are arranged to ensure that the cutter head 2 will not shake or fall off during the rotation process.

[0038] Cutting preparation: A cutting edge 9 is provided on the end face of the cutter head 2, and a spiral chip removal groove 10 is provided next to the cutting edge 9 for effectively removing chips during the cutting process.

[0039] A flow channel 7 is provided inside the tool bar 1, and the flow channel 7 is connected with a liquid outlet 8 on the tool head 2, and is used for providing coolant or lubricant during the cutting process.

[0040] Start cutting: After the twist drill is started, the tool bar 1 drives the tool head 2 to rotate at high speed. The cutting edge 9 contacts the workpiece and the cutting operation begins. At the same time, the coolant or lubricant enters the outlet hole 8 through the flow channel 7 to cool and lubricate the cutting area.

[0041] Chip removal: During the cutting process, the generated chips are guided and discharged by the spiral chip removal groove 10. The design of the chip removal groove 10 ensures that the chips can be discharged smoothly to avoid clogging and affecting the cutting effect.

[0042] Replacement of the cutter head 2: When the cutting edge 9 of the cutter head 2 is worn or damaged, the cutter head 2 can be removed from the cutter bar 1 by removing the long bolts. After replacing the new cutter head 2, reinstall and perform cutting operations.

[0043] Working principle of the utility model

[0044] Rotary cutting: The twist drill cuts the workpiece by means of a high-speed rotating cutter head 2. When the cutting edge 9 contacts the workpiece, the cutting force generated by the rotation is used to remove the workpiece material.

[0045] Cooling and lubrication: The flow channel 7 inside the tool bar 1 is connected to the liquid outlet 8 on the cutter head 2, and the coolant or lubricant is delivered to the cutting area through the flow channel 7. The coolant can lower the temperature of the cutting area and reduce the wear of the cutter head 2; the lubricant can reduce the friction and resistance during the cutting process and improve the cutting efficiency.

[0046] Chip removal: The design of the spiral chip removal groove 10 allows the chips to be discharged smoothly along the groove, avoiding the accumulation of chips in the cutting area and affecting the cutting effect.

[0047] The cutter head 2 and the cutter bar 1 can be replaced independently. This design makes the twist drill more flexible and maintainable, and the appropriate cutter head 2 type can be selected according to different processing requirements, and the worn or damaged cutter head 2 can be easily replaced.

[0048] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention are included in the scope of the claims of the present invention.

Claims

1. A twist drill with a replaceable cutter head, comprising a cutter bar (1) and a cutter head (2), wherein the cutter head (2) and a guide bar (3) are connected by a long bolt, characterized in that: The cutter head (2) is provided with a liquid outlet hole (8), anti-rotation high and low teeth (4) are provided between the cutter head (2) and the cutter rod (1), and an anti-rotation buckle (6) is provided between the cutter rod (1) and the screw rod (5).

2. A twist drill with replaceable cutter head according to claim 1, characterized in that: A flow channel (7) is provided in the knife rod (1), and the flow channel (7) is connected to the liquid outlet hole (8) provided on the knife head (2).

3. A twist drill with replaceable cutter head according to claim 1, characterized in that: The tool head (2) comprises a straight shank tool head (2) and a tapered shank tool head (2).

4. A twist drill with replaceable cutter head according to claim 3, characterized in that: The end surface of the cutter head (2) is provided with a cutting edge (9).

5. A twist drill with replaceable cutter head according to claim 4, characterized in that: A spiral chip removal groove (10) is provided next to the cutting edge (9) on the end face of the cutter head (2).

6. A twist drill with replaceable cutter head according to claim 2, characterized in that: The diameter range of the knife rod (1) is 6 mm to 10 mm, and the diameter range of the flow channel (7) is 2 mm to 4 mm.

7. A twist drill with replaceable cutter head according to any one of claims 1 to 5, characterized in that: The cutter head (2) is made of hard alloy steel.

8. A twist drill with replaceable cutter head according to any one of claims 1 to 5, characterized in that: The number of the liquid outlet holes (8) is 2-3.

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