Forming drill bit for machining hole bottom in R shape
By designing a forming drill bit for machining the R-shape at the bottom of holes and employing a reasonable helix angle and cutting edge angle structure, rapid machining of the R-shape at the bottom of blind holes was achieved, improving efficiency and reducing costs.
Patent Information
- Application Number
- CN202423068607.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Existing technologies are inefficient when machining blind holes with an R-shaped bottom. Conventional methods require drilling first and then contour machining, resulting in low machining efficiency.
Design a forming drill bit for machining R-shaped holes, including a cutting part and a shank. The cutting part consists of a peripheral cutting edge and an R-shaped drill tip. The spiral cutting edge and the R-shaped drill tip are set on both sides of the spiral cutting edge. With reasonable spiral angle, rake angle and clearance angle design, the hole bottom is formed in one drilling operation.
It enables rapid machining of the R-shape at the bottom of the hole, improves machining efficiency, extends tool life, and reduces machining costs.
Smart Images
Figure CN223572060U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of for processing the bottom of hole is R type's profile drill, belong to mechanical processing technical field. BACKGROUND
[0002] In the field of special equipment manufacturing, there are many blind hole bottoms with R shape, and the R size is not equal to the hole diameter. For example, the material of the processed product is 42CrMo, the hardness is 38-40HRC, the hole depth is usually 2 times the hole diameter, and the hole bottom R is usually (0.6-0.7) hole diameter. The conventional process needs to drill a hole first and then use a ball nose milling cutter smaller than the hole diameter to profile the hole bottom R. This method has low processing efficiency. Therefore, how to realize the rapid processing of this type of hole has become a technical problem to be solved. SUMMARY
[0003] The utility model aims at providing a kind of for processing the bottom of hole is R type's profile drill. The tool can drill a hole with R-shaped bottom in one time, the processing efficiency can be doubled, the processing cost is lower, and the quality is reliable.
[0004] The technical scheme of the utility model: a kind of for processing the bottom of hole is R type's profile drill, including cutting part and handle, cutting part is composed of peripheral edge and R type drill tip blade, peripheral edge includes 2 right-hand spiral blades, and 2 R type drill tip blades are respectively arranged on the two sides of spiral blade;Wherein the spiral angle of spiral blade is 20~35°, and the rake angle of peripheral edge is-3°~5°.
[0005] In the foregoing profile drill for processing the bottom of hole is R type, the rake angle of the R type drill tip blade is =0~3°, the first relief angle is 12~15°, the first relief angle width is =0.075*blade diameter, and the second relief angle angle of the R type drill tip blade is =25~27°.
[0006] In the foregoing profile drill for processing the bottom of hole is R type, the R type drill tip blade center is transitioned by using horizontal blade.
[0007] In the foregoing profile drill for processing the bottom of hole is R type, the core diameter of the profile drill is =(0.3-0.4)*blade diameter.
[0008] The utility model has the beneficial effects: compared with prior art, the cutting part of the utility model is composed of peripheral edge and R type drill tip blade. By using the profile R type drill, the drilling and bottom forming are completed by one-time drilling, and the processing efficiency is improved. The appropriate rake angle, relief angle and spiral angle and the reasonable tool structure design improve the tool service life and reduce the processing cost. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 It is the structural schematic diagram of the utility model.
[0010] Figure 2 is a side structure schematic view of the R-shaped drill tip blade; Figure 1
[0011] Figure 3 is a related angle schematic view of the peripheral edge;
[0012] Figure 4 is a related angle schematic view of the R-shaped drill tip blade.
[0013] Reference signs: 1-cutting part, 2-shank, 3-peripheral edge, 4-R-shaped drill tip blade. DETAILED DESCRIPTION
[0014] The utility model will be further explained in connection with the drawings and examples, but not as the basis for limiting the utility model.
[0015] The embodiment of the utility model: a kind of for processing hole bottom is R-shaped forming drill bit, including cutting part 1 and shank 2, cutting part 1 is composed of peripheral edge 3 and R-shaped drill tip blade 4, peripheral edge 3 includes 2 right-hand helical edge, and 2 R-shaped drill tip blades 4 are respectively arranged in the two sides of helical edge;Wherein the helical angle of helical edge is 20~35 °, the core diameter of forming drill bit=(0.3-0.4)*edge diameter, peripheral edge rake angle is-3 °~5 °.
[0016] The rake angle of the R-shaped drill tip blade 4 is =0~3 °, the first relief angle is 12~15 °, the first relief angle width=0.075*edge diameter, and the second relief angle angle of the R-shaped drill tip blade 4=25~27 °.
[0017] The center of the R-shaped drill tip blade 4 is transitioned using a cross blade.
[0018] The cutting part of the utility model is composed of peripheral edge 3 and R-shaped drill tip blade 4, since using forming R-shaped drill bit, through once drilling forming, drilling and bottom forming machining are completed, and processing efficiency is improved. The peripheral edge rake angle, R-shaped drill tip blade rake angle, R-shaped drill tip blade first relief angle, R-shaped drill tip blade second relief angle, helical angle of helical edge, core diameter and first relief angle width are appropriate, and reasonable tool structure design is improved, tool service life is improved, and processing cost is reduced.
Claims
1. A profiled drill bit for machining a hole bottom of R type, characterized in that: The cutting part (1) and the handle (2) are included, the cutting part (1) is composed of the peripheral edge (3) and the R type drill tip edge (4), the peripheral edge (3) includes two right-hand helical edges, and the two R type drill tip edges (4) are arranged on the two sides of the helical edges respectively; wherein the helix angle of the helical edge is 20-35 °, and the peripheral edge rake angle is -3 °-5 °.
2. The shaped drill bit of claim 1, wherein: The rake angle of the R type drill tip edge (4) is =0-3 °, the first relief angle is 12-15 °, the first relief angle width is =0.075*edge diameter, and the second relief angle angle of the R type drill tip edge (4) is =25-27 °.
3. The shaped drill bit of claim 1, wherein: The R type drill tip edge (4) is transitioned in a cross edge mode at the center.
4. The shaped drill bit of claim 1, wherein: The core diameter of the formed drill bit is =(0.3-0.4)*edge diameter.