Drilling and countersinking combined drill for machining inner wall of engine cylinder body

Abstract

The utility model discloses a drilling and countersinking combined drill for machining the inner wall of an engine cylinder block, which comprises a drill bit part, a countersinking cutter part and a cutter body part, the drill bit part, the countersinking cutter part and the cutter body part are coaxially arranged and integrally manufactured, at least one cutting edge is arranged at a drill point at the front end of the drill bit part, and at least one spiral chip groove is arranged on the drill bit part and the countersinking cutter part. The cutter body part is cylindrical, three cutting edges are arranged at a drill point at the front end of the drill bit part, the three cutting edges are uniformly distributed in the circumferential direction of the drill point at the front end of the drill bit part, and three end face cooling liquid grooves which are uniformly distributed in the radial direction are formed in the end face of the cutter body part. Three column body cooling liquid grooves which are evenly distributed in the circumferential direction are formed in a column body of the cutter body part, three spiral chip grooves which are evenly distributed in the circumferential direction are formed in the drill bit part and the countersink part, and the end face cooling liquid grooves, the column body cooling liquid grooves and the spiral chip grooves are communicated with one another in a one-to-one correspondence mode. The center of the drill bit can be prevented from deviating, and the cutter cooling effect is better.

Description

Technical Field

[0001] The utility model relates to a metal cutting tool for mechanical processing, in particular to a countersinking composite drill for inner wall countersinking processing in the manufacturing process of an engine cylinder body. Background Art

[0002] The inner wall countersinks of gasoline engine cylinder blocks, diesel engine cylinder blocks, aerospace components, and hydraulic components of engineering machinery, such as titanium aluminum alloy, silicon aluminum alloy, zinc aluminum alloy, and carbon fiber composite materials, all require efficient, high-speed, and precise drilling and countersinking.

[0003] The drill countersinking compound drill used in the process of machining the inner wall of the engine cylinder body includes a drill head, a countersinking part and a cutter body. The drill head, the countersinking part and the cutter body are coaxially arranged and made into one piece. Two cutting edges are arranged at the front end drill tip of the drill head, and two spiral chip grooves are arranged on the drill head and the countersinking part. The cutter body is cylindrical. When drilling and machining the countersinking holes on the inner wall of the cylinder body, the drill countersinking compound drill with this structure is prone to tool vibration during machining due to the slight protrusions on the inner wall surface of the cylinder body. The strength and rigidity of the drill bit are relatively weak, so the drill center often deviates, resulting in the deviation of the distance between the countersinks, which reduces the machining accuracy of the cylinder body. In addition, the tool is cooled by pouring coolant on the drill head and the countersinking part, but the tool still generates a lot of heat during the machining process, and the cooling effect is not ideal. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a composite countersink drill for machining the inner wall of an engine cylinder body which is not only simple in structure but also can avoid deviation of the drill center and the countersink spacing and has a better tool cooling effect.

[0005] In order to solve the above technical problems, the utility model adopts a drill countersinking composite drill for processing the inner wall of an engine cylinder body, comprising a drill head, a countersinking part and a cutter body, the drill head, the countersinking part and the cutter body are coaxially arranged and the three are made in one piece, at least one cutting edge is provided at the front end drill tip of the drill head, at least one spiral chip removal groove is provided at the drill head and the countersinking part, the cutter body is cylindrical, three cutting edges are provided at the front end drill tip of the drill head, the three cutting edges are evenly distributed along the circumferential direction of the front end drill tip of the drill head, three end face coolant grooves evenly distributed in the radial direction are opened on the end face of the cutter body, three column coolant grooves evenly distributed in the circumferential direction are opened on the column of the cutter body, three spiral chip removal grooves evenly distributed in the circumferential direction are provided on the drill head and the countersinking part, and the end face coolant grooves, column coolant grooves and spiral chip removal grooves are connected to each other in a one-to-one correspondence.

[0006] As a preferred embodiment of the utility model, a chamfering transition cutting edge is provided at the connection between the drill head and the countersinking part.

[0007] As a preferred embodiment of the present utility model, there is one chamfered transition cutting edge, and the angle between the chamfered transition cutting edge and the central axis of the cutter body is 36° to 40°.

[0008] As a preferred embodiment of the present utility model, the angle between the chamfered transition cutting edge and the central axis of the tool body is 38°.

[0009] After adopting the above structure, the utility model has the following beneficial effects:

[0010] The utility model sets three cutting edges at the front end drill tip of the drill head, and the three cutting edges are evenly distributed along the circumferential direction of the front end drill tip of the drill head. When working, the three cutting edges can better play a centering role, avoid drilling deviation and drill center deviation, effectively prevent the countersink spacing from deviating, and improve the cylinder body processing accuracy.

[0011] The utility model is provided with three end face cooling liquid grooves evenly distributed in the radial direction on the end face of the cutter body, three column cooling liquid grooves evenly distributed in the circumferential direction on the column of the cutter body, and three spiral chip removal grooves evenly distributed in the circumferential direction on the drill head and the countersinking part. The end face cooling liquid grooves, column cooling liquid grooves, and spiral chip removal grooves are connected to each other in a one-to-one correspondence. In this way, during operation, the end face cooling liquid grooves can increase the cooling flow pressure, and cooperate with the external column cooling liquid grooves to better realize the cooling of the tool during high-speed cutting, thereby increasing the tool life and reducing the tool use cost.

[0012] The utility model is provided with a chamfered transition cutting edge at the connection between the drill head and the countersinking part, and the angle between the chamfered transition cutting edge and the central axis of the cutter body is 36° to 40°, preferably 38°. Such a structure can better meet the processing requirements of the engine cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0014] Figure 1 The utility model is a structural schematic diagram of a composite drill for countersinking used for machining the inner wall of an engine cylinder body.

[0015] Figure 2 for Figure 1 Schematic diagram of the left side.

[0016] Figure 3 for Figure 1 Schematic diagram of the right side. DETAILED DESCRIPTION

[0017] See also Figures 1 to 3 The drill countersinking composite drill for machining the inner wall of an engine cylinder body shown in the figure comprises a drill head 1, a countersinking part 2 and a cutter body 3. The drill head 1, the countersinking part 2 and the cutter body 3 are coaxially arranged and the three are made in one piece. At least one cutting edge 1a is provided at the front end drill tip 1-1 of the drill head 1, and at least one spiral chip removal groove 4 is provided at the drill head 1 and the countersinking part 2. The cutter body 3 is cylindrical, and three cutting edges 1a are provided at the front end drill tip 1-1 of the drill head 1. The three cutting edges 1a are evenly distributed along the circumferential direction of the front end drill tip 1-1 of the drill head 1, three end face coolant grooves 3a evenly distributed in the radial direction are opened on the end face of the tool body 3, three column coolant grooves 3b evenly distributed in the circumferential direction are opened on the column of the tool body 3, and three spiral chip removal grooves 4 evenly distributed in the circumferential direction are provided on the drill head 1 and the countersinking part 2, and the end face coolant grooves 3a, the column coolant grooves 3b, and the spiral chip removal grooves 4 are connected to each other in a one-to-one correspondence.

[0018] As a preferred embodiment of the present invention, Figure 1 As shown, a chamfering transition cutting edge 5 is provided at the connection between the drill head 1 and the countersinking cutter 2. Such a structure can better meet the processing requirements of the engine cylinder block.

[0019] As a preferred embodiment of the present invention, there is one chamfered transition cutting edge 5, and the angle between the chamfered transition cutting edge 5 and the central axis of the blade body 3 is 36° to 40°.

[0020] As a preferred embodiment of the present utility model, the angle between the chamfered transition cutting edge 5 and the central axis of the tool body 3 is 38°.

[0021] After trial use, it was found that the utility model has a simple structure, can avoid deviation of the drill center, prevent the countersink spacing from deviating, has a better tool cooling effect, and has achieved good practical effects.

Claims

1. A composite drill for countersinking for machining the inner wall of an engine cylinder, comprising a drill head (1), a countersinking part (2) and a cutter body (3), wherein the drill head (1), the countersinking part (2) and the cutter body (3) are coaxially arranged and are integrally manufactured, at least one cutting edge (1a) is provided at the front end drill tip (1-1) of the drill head (1), at least one spiral chip removal groove (4) is provided on the drill head (1) and the countersinking part (2), and the cutter body (3) is cylindrical, characterized in that: Three cutting edges (1a) are provided at the front end drill tip (1-1) of the drill head (1), and the three cutting edges (1a) are evenly distributed along the circumferential direction of the front end drill tip (1-1) of the drill head (1); three end face coolant grooves (3a) evenly distributed along the radial direction are provided on the end face of the tool body (3); three column coolant grooves (3b) evenly distributed along the circumferential direction are provided on the column of the tool body (3); and three spiral chip removal grooves (4) evenly distributed along the circumferential direction are provided on the drill head (1) and the countersinking cutter (2); the end face coolant grooves (3a), the column coolant grooves (3b), and the spiral chip removal grooves (4) are connected to each other in a one-to-one correspondence.

2. The composite drill for countersinking the inner wall of an engine cylinder according to claim 1, characterized in that: A chamfering transition cutting edge (5) is provided at the connection between the drill head (1) and the countersinking cutter head (2).

3. The composite drill for countersinking the inner wall of an engine cylinder according to claim 2, characterized in that: There is one chamfered transition cutting edge (5), and the angle between the chamfered transition cutting edge (5) and the central axis of the cutter body (3) is 36° to 40°.

4. The composite drill for countersinking the inner wall of an engine cylinder according to claim 3, characterized in that: The included angle between the chamfered transition cutting edge (5) and the central axis of the cutter body (3) is 38°.

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