Ball head stepped drill

Abstract

The utility model relates to the technical field of ball head step drills, and discloses a ball head step drill which comprises a cutter handle part, a cutter body is installed outside the cutter handle part, a cutting edge is installed outside the cutter body, a drilling and expanding hinge is arranged outside the cutting edge, a step hole reaming hinge edge is fixedly connected outside the cutting edge, an inner cooling water channel is formed in the upper portion of the cutting edge, and a cooling water channel is formed in the lower portion of the step hole reaming hinge edge. The inner cooling water channel is communicated with an inner hole of the cutter handle portion, the drilling and expanding hinges are evenly distributed in a six-edge mode, and the cutting edges are made of hard alloy. According to the utility model, the ball socket forming cutting edge at the front end of the cutter is asymmetrically designed, the problems of tipping and vibration caused by zero cutting speed of a rotating center are avoided, different parts of the cutter body are subjected to optimized heat treatment, the hardness and toughness are reasonably distributed, the stress of the cutter is more balanced, and the service life of the cutter is prolonged. And the inner cooling water channel is arranged in the cutter, so that the cutting edge is effectively cooled, chip discharge is promoted, the machining efficiency is improved, and the service life of the cutter is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of ball head step drills, in particular to a ball head step drill. Background Art

[0002] The ball-end step drill is a hydraulic valve body oil circuit finishing combination tool, usually used for step-by-step drilling of workpieces. It combines the functions of a ball-end drill and a step drill, so it can complete the processing of spherical surfaces and stepped holes.

[0003] The traditional ball-and-socket forming cutting edge is designed with a symmetrical structure. As a result, during the rotation process, the center part of the cutting edge is prone to chipping and vibration problems due to the cutting speed close to zero. This not only affects the finish of the machined surface, but may also reduce the service life of the tool. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a ball head stepped drill, which aims to improve the traditional ball socket forming cutting edge design in the prior art as a symmetrical structure, resulting in the central part of the cutting edge being prone to chipping and vibration problems during rotation due to the cutting speed being close to zero.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] The ball-end step drill comprises a shank portion, a cutter body is mounted on the outside of the shank portion, a cutting edge is mounted on the outside of the cutter body, a drill reamer is arranged on the outside of the cutting edge, and a step hole countersink is fixedly connected to the outside of the cutting edge.

[0007] Furthermore, an internal cooling water channel is provided on the upper portion of the cutting edge, and the internal cooling water channel is communicated with the inner hole of the shank portion.

[0008] Furthermore, the drill, expander and reamer has six blades evenly distributed.

[0009] Furthermore, the cutting edge is made of cemented carbide.

[0010] Furthermore, the step hole countersink has six blades evenly distributed.

[0011] Furthermore, the shape of the cutting edge is an R-shaped ball-and-socket shape.

[0012] The utility model has the following beneficial effects:

[0013] In this utility model, the ball-socket-shaped cutting edge at the front end of the tool adopts an asymmetric design, which avoids the chipping and vibration problems caused by the zero cutting speed of the rotation center, improves the processing accuracy, and adopts optimized heat treatment for different parts of the tool body. The hardness and toughness are reasonably distributed to ensure that the tool is more evenly stressed and prevent breakage. The tool is equipped with an internal cooling water channel design to effectively cool the cutting edge and promote chip discharge, thereby improving processing efficiency and tool life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A plan view of the ball-end step drill proposed in the present invention;

[0015] Figure 2 This is a schematic diagram of the cutting edge structure of the ball-end step drill proposed in the present invention.

[0016] Legend:

[0017] 1. Cutting edge; 2. Drilling, reaming, and reaming; 3. Countersinking and reaming of stepped holes; 4. Internal cooling water channel; 5. Shank; 6. Tool body. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Reference Figure 1 and Figure 2 The utility model provides an embodiment: a ball-end step drill, comprising a shank portion 5, a cutter body 6 is mounted on the outside of the shank portion 5, a cutting edge 1 is mounted on the outside of the cutter body 6, a drilling and reaming blade 2 is arranged on the outside of the cutting edge 1 to ensure that the diameter and shape of the hole meet the requirements, a step hole countersinking blade 3 is fixedly connected to the outside of the cutting edge 1, an internal cooling water channel 4 is opened on the upper part of the cutting edge 1, and the internal cooling water channel 4 is communicated with the inner hole of the shank portion 5 to prevent tool wear caused by excessive temperature, the drilling and reaming blade 2 is evenly distributed with six blades, the material of the cutting edge 1 is cemented carbide, which improves the strength of the cutting edge 1, the step hole countersinking blade 3 is evenly distributed with six blades, and the shape of the cutting edge 1 is an R ball socket shape.

[0020] Specifically, the front end of the tool is a formed cutting edge 1 for ball socket processing. The cutting edge 1 is made of carbide material, fixed by brazing, and designed to be distributed with two edges. The cutting edge 1 is in the shape of an R ball socket. In order to ensure that the center point of the ball socket can be completely processed during the cutting process, the cross-sectional length of one edge is designed to be larger than the radius of the ball socket. This can avoid the chipping and vibration problems caused by the zero cutting speed of the center point in conventional designs, and ensure the accuracy and smoothness of the machined surface. The middle part is a drill, expander, and reamer 2, which is designed to be evenly distributed with six edges. This part is responsible for further finishing of the holes that have been preliminarily processed to ensure that the diameter and shape of the holes meet the requirements. The six edges are evenly distributed. The design of the cloth helps to evenly distribute the cutting force, improve machining accuracy, and reduce tool wear during machining. The rear part of the tool is the step hole countersink blade 3, which is also designed to be evenly distributed with six blades. This part is used for fine machining of the step hole, and the flatness and smoothness of the hole mouth are achieved by countersinking. The middle and rear parts of the tool body 6 are both provided with internal cooling water channels 4, which are connected to the inner hole of the shank part 5. During the machining process, the coolant enters the cutting edge 1 of the tool through the water channel, effectively cooling the cutting edge 1 to prevent tool wear caused by excessive temperature. At the same time, internal cooling can also assist in chip removal, ensure that the cutting area remains clean, and avoid chip accumulation affecting machining efficiency.

[0021] Working principle: The front part of the tool is a forming cutting edge 1 for ball socket processing. The cutting edge 1 is made of carbide material, fixed by brazing, and designed to be distributed with two edges. The cutting edge 1 is in the shape of an R ball socket. When viewed from the cross-section direction, the cross-section length of one edge is greater than the radius of the processed ball socket, ensuring that the center point can be completely cut during ball socket forming cutting. The middle part is a drilling and reaming blade 2 with six evenly distributed edges, and the rear part is a step hole countersinking blade 3 with six evenly distributed edges. The middle and rear cutting edges 1 are provided with internal cooling water channels 4, which are connected to the inner hole of the shank 5, which is beneficial to the cooling of the cutting edge 1 and the discharge of chips during cutting. Different parts of the cutter body 6 adopt different heat treatment methods and hardness. The shank part 5 is quenched and has a high hardness, which is beneficial to improving the wear resistance and clamping accuracy of the cutter handle. The cutter body 6 is partially adjusted to ensure sufficient strength and a certain toughness to prevent the cutter body 6 from breaking due to excessive cutting force. The asymmetric design of the two ball-socket-shaped cutting edges 1 at the front end is realized, which is better than the ordinary symmetrical design. The cutting edge 1 has chipping and vibration problems due to the zero cutting speed of the rotation center; different parts of the cutter body 6 adopt different heat treatment and hardness, and the force is more reasonable; internal cooling is adopted, the cooling effect is good, and it is beneficial to chip removal.

[0022] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A ball-end step drill, comprising a shank portion (5), characterized in that: A cutter body (6) is installed on the outside of the cutter handle (5), a cutting edge (1) is installed on the outside of the cutter body (6), a drill reamer (2) is provided on the outside of the cutting edge (1), and a stepped hole countersinking blade (3) is fixedly connected to the outside of the cutting edge (1).

2. The ball-end step drill according to claim 1, characterized in that: An internal cooling water channel (4) is provided on the upper portion of the cutting edge (1), and the internal cooling water channel (4) is communicated with the inner hole of the shank portion (5).

3. The ball-end step drill according to claim 1, characterized in that: The drill-reamer (2) has six blades evenly distributed.

4. The ball-end step drill according to claim 1, characterized in that: The material of the cutting edge (1) is hard alloy.

5. The ball-end step drill according to claim 1, characterized in that: The step hole countersinking blade (3) has six blades evenly distributed.

6. The ball-end step drill according to claim 1, characterized in that: The shape of the cutting edge (1) is an R-shaped ball socket.

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