A side milling cutter for drilling and expanding holes
By designing a drilling and reaming side milling cutter with side milling edges and cutting edges, the problem of tool replacement in keyway processing in the prior art requires multiple tools to be replaced, and high-precision and high-efficiency machining effect is achieved.
Patent Information
- Application Number
- CN202421022355.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-05-13
AI Technical Summary
In the prior art, drill bits and flat bottom drills can only be drilled and reamed, while two-edged milling cutters can only be side milled, resulting in the need to replace the tool when the keyway processing is difficult to ensure the accuracy and low efficiency.
A drilling and reaming side milling cutter is designed. Two chip drain grooves are arranged along the square spiral along its length to form a side milling edge and two sets of cutting edges for cutting drilling and side milling grooves to realize one-time clamping positioning.
Through the setting of side milling edges and cutting edges, high-precision machining of keyways is achieved, saving time in tool replacement and improving machining efficiency.
Smart Images
Figure CN222696102U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cutting tools, in particular to a drilling and reaming side milling cutter. Background Art
[0002] A keyway is a groove on a shaft or in a hole that matches a key and is used to install a key to transmit torque. In mechanical processing, the keyway processing technology is generally processed by drilling first and then milling. However, among the current processing tools, ordinary drills or flat-bottom drills can only be used for drilling and expanding holes, and two-edge milling cutters can only be used for side milling. This requires the replacement of tools during the processing process. Because it requires two clamping and positioning, the processing accuracy of the keyway is difficult to guarantee, which also leads to low processing efficiency of the keyway. Utility Model Content
[0003] In order to solve the above problems, the utility model provides a drilling and reaming side milling cutter.
[0004] The above technical purpose of the utility model is achieved through the following technical scheme: a drilling and reaming side milling cutter, comprising a shank and a blade, the blade having two chip grooves arranged in a square spiral along its length, a side milling blade formed on a common side wall of the two chip grooves, the helix angle α of the side milling blade being 34°-36°, two groups of cutting edges being arranged centrally symmetrically at the end of the blade and the blade connection line of the two groups of cutting edges passing through the center of the end of the blade.
[0005] Furthermore, the cutting end face of the cutting edge is inclined outward from the center point of the cutting edge and the inclination angle β is 1.5°-2.5°.
[0006] Furthermore, the cutting edges of the two cutting edges are arranged away from the center line of the cutting edge end and the center offset A is 0.03mm-0.05mm.
[0007] Furthermore, the outer end of the cutting edge of the cutting blade is bent into an arc shape in a clockwise direction.
[0008] Furthermore, a frustoconical transition section is provided between the knife handle and the blade, and the diameter of the frustoconical transition section on a side adjacent to the knife handle is greater than the diameter on a side adjacent to the blade.
[0009] To sum up, the utility model has the following beneficial effects: by arranging a side milling edge and two groups of cutting edges on the blade, which are used for cutting drilling and side milling grooves respectively, the tool only needs to be clamped and positioned once during the processing, which effectively ensures the processing accuracy of the keyway, saves the time of changing the tool, and greatly improves the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;
[0011] Figure 2 This is a schematic diagram of the structure of an embodiment of the utility model for highlighting an angle;
[0012] Figure 3 It is a schematic diagram of the end surface structure of the blade of the embodiment of the utility model.
[0013] In the figure: 1. Tool handle; 2. Blade; 3. Chip groove; 4. Side milling edge; 5. Cutting edge; 6. Cone transition section. DETAILED DESCRIPTION
[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.
[0015] like Figure 1-3 As shown, the embodiment of the present application discloses a drilling and reaming side milling cutter, including a shank 1 and a blade 2, which is used for drilling and side milling keyways of parts. The shank 1 and the blade 2 are made of high-quality alloy bars, and post-processing grinding and polishing are performed at the cutting edge of the blade 2, and an AlTiN coating is added to the surface to increase the service life of the tool. In the specific setting, the shank 1 is cylindrical, and a frustum transition section 6 is set between the shank 1 and the blade 2. The diameter of the frustum transition section 6 adjacent to the shank 1 is larger than the diameter adjacent to the blade 2, so that the overall diameter of the blade 2 is smaller than the diameter of the shank 1.
[0016] The blade 2 is cylindrical in shape and arranged at the front end of the truncated cone transition section 6. Two chip removal grooves 3 are arranged in a square spiral along the length of the cylinder. The chip removal grooves 3 are used to remove part debris during drilling and milling to prevent the debris from adhering to the part processing position and affecting the processing effect. Two side milling edges 4 are formed on the common side wall of the two chip removal grooves 3. The helix angle α of the side milling edge 4 is 34°-36°. The edge portion of the side milling edge 4 is formed with a blade peak arranged in the counterclockwise direction, which is used for side milling of the keyway.
[0017] Two groups of cutting edges 5 are arranged symmetrically at the end of the blade 2. The cutting edges of the two groups of cutting edges 5 are arranged along the center line direction of the end of the blade 2 and are arranged from the inner end close to the center point of the end of the blade 2. A notch is arranged between the inner ends of the cutting edges of the two groups of cutting edges 5, and the width of the notch is 0.05mm-0.1mm. The edges of the cutting edges of the cutting edges 5 are arranged away from the center line of the end of the blade 2 and the center offset A is 0.03mm-0.05mm. The outer end of the cutting edge of the cutting edge 5 is bent into an arc shape in a clockwise direction from its cutting edge, and then tilted from the outside to the inside to form a cutting edge. The cutting end face of the cutting edge 5 tilts outward from the center point of the blade 2 and the tilt angle β is 1.5°-2.5°, so that the cutting edge bulges forward and outward, which is convenient for drilling and reaming parts.
[0018] The side milling edge 4 and the cutting edge 5 are respectively used for cutting and drilling and side milling and grooving. In this way, the tool only needs to be clamped and positioned once during the processing, which effectively ensures the processing accuracy of the keyway, saves the time of tool replacement, and greatly improves the processing efficiency.
[0019] The parts processed in this embodiment are 20CrMo alloy steel, and the keyway width required to be processed is 2+0.2 / ﹢0.05mm, and the groove depth is 4±0.1mm. In the specific setting, the diameter of the handle 1 is set to 3mm, the overall diameter of the blade 2 is set to 2.15mm, and the overall length of the blade 2 is 5mm.
[0020] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.
Claims
1. A drilling and reaming side milling cutter, comprising a shank (1) and a cutting edge (2), characterized in that: The blade (2) is provided with two chip removal grooves (3) in a square spiral along its length, and a side milling edge (4) is formed on a common side wall of the two chip removal grooves (3), and the helix angle α of the side milling edge (4) is 34°-36°; Two groups of cutting edges (5) are centrally symmetrically arranged at the end of the blade (2); the blade portions of the two groups of cutting edges (5) are arranged along the center line direction of the end of the blade (2) and their inner ends are arranged adjacent to the center point of the end of the blade (2); a notch is arranged between the inner ends of the blade portions of the two groups of cutting edges (5), and the width of the notch is 0.05 mm-0.1 mm; the cutting edges of the cutting edges (5) are arranged offset from the center line of the end of the blade (2) and the center offset A is 0.03 mm-0.05 mm; the outer end of the cutting edge of the cutting edge (5) is bent clockwise from the cutting edge to form an arc shape, and then tilted from the outside to the inside to form a blade tip; the cutting end face of the cutting edge (5) tilts outward from the center point of the blade (2) and the tilt angle β is 1.5°-2.5°.
2. A drilling and reaming side milling cutter according to claim 1, characterized in that: A truncated cone transition section (6) is provided between the knife handle (1) and the blade (2); the diameter of the truncated cone transition section (6) on the side adjacent to the knife handle (1) is greater than the diameter on the side adjacent to the blade (2).