Hard alloy welding reamer
By designing a carbide welded reamer, using a stepped cutting surface and multi-stage zigzag inserts, the problem of insufficient hardness and toughness of existing reamers in the machining of stepped holes was solved, achieving high-precision and low-cost machining of stepped holes.
Patent Information
- Application Number
- CN202520134052.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Existing reamers have insufficient cutting edge hardness and toughness when machining stepped holes, resulting in rapid wear, reduced machining accuracy and surface quality, and difficulty in simultaneously cutting the hole wall and the front end face, leading to non-round inner holes, uneven allowance, and excessive surface roughness.
Design a cemented carbide welded reamer that uses a stepped cutting surface and multi-stage zigzag inserts, combining carbon structural steel and tungsten-cobalt alloy materials, and forms the cutting edge by welding, thereby enhancing toughness and strength and ensuring the stability and accuracy of the cutting process.
It achieves efficient one-time machining of stepped holes, with smooth cut surfaces, high surface precision, reduced wear rate, extended service life, and reduced machining costs.
Smart Images
Figure CN223762270U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of machining tool technology, and specifically relates to a cemented carbide welded reamer. Background Technology
[0002] Reamers are mainly used for enlarging or repairing holes. Their design primarily aims to remove a thin layer of metal from the surface of a machined hole, thus limiting their cutting ability; the cutting section of a reamer is typically short. Machining stepped holes with reamers involves cutting both the bottom and sides of the hole. Existing reamers have the following drawbacks: First, the cutting edge hardness and toughness are insufficient to handle the material being machined, causing rapid edge wear, resulting in inaccurate hole diameter, decreased surface quality, and increased machining costs. Second, it is difficult to simultaneously cut the hole wall and the front face, leading to non-circular inner holes, uneven or insufficient reaming allowance, unreamed areas, and excessive surface roughness. Summary of the Invention
[0003] To address the aforementioned problems and technical requirements, this utility model provides a carbide welding reamer that can form stepped holes in one operation, featuring smooth cut surfaces, high processing efficiency, and high surface precision.
[0004] The technical solution of this utility model is as follows: a cemented carbide welded reamer, comprising a stepped tool body and a tool holder, the tail end of which is fixedly connected to a cylindrical tool holder, and two straight cutting surfaces are provided around the stepped tool body, both of which are axially arranged and radially pointing towards the central axis; the cutting surfaces are stepped in shape with progressively increasing cutting diameters, including a first step, a second step, and a third step arranged sequentially from front to back, the front end of the first step is provided with a first blade, the outer edge of the first blade protruding from the front end face and the circumferential surface of the stepped tool body respectively, and the outer edge of the first blade is right-angled; the transition part between the first step and the second step is provided with a second blade, and the transition part between the second step and the third step is provided with a third blade, the outer edges of the second blade and the third blade are both multi-level broken line type, and the first blade, the second blade, and the third blade are all welded to the stepped tool body.
[0005] Furthermore, the front end of the outer cutting edge of the second blade is connected to the first step by a first inclined plane, and the rear end is connected to the second step by a second inclined plane. The angle between the first inclined plane and the axial direction is 40°, the angle between the second inclined plane and the axial direction is 30°, and the middle part of the outer cutting edge of the second blade is right-angled.
[0006] Furthermore, the outer edge of the third blade and the second step are connected by a third inclined plane, the angle between the third inclined plane and the axial direction is 45°, and the outer edge of the third blade protrudes from the third step.
[0007] Furthermore, the cutting inclination angle of the third blade edge is 5°.
[0008] Furthermore, the stepped tool body is also provided with two chip removal grooves, which are arranged along the axial direction, and the chips generated during the cutting surface machining are discharged outward through the chip removal grooves.
[0009] Furthermore, the stepped blade body and handle are made of carbon structural steel, and the first blade, second blade and third blade are all made of tungsten-cobalt alloy.
[0010] The beneficial effects of this utility model are as follows: The use of carbide inserts welded onto the stepped tool body gives the cutting edge superior toughness and strength compared to the tool body itself. This reduces the wear rate of the cutting edge during cutting, lowers processing costs, and extends service life. When using this reamer for hole enlargement, the stepped cutting surface can cut into the hole layer by layer. The first insert ensures the machining accuracy of the bottom face of the hole, removing excess material while ensuring the machined cutting edge is at a right angle. The second and third inserts can machine multiple steps, with multiple bevels between them. These bevels protect the cutting edge, making it less prone to breakage and chipping when the stepped tool body feeds inward, improving machining stability, and resulting in highly accurate stepped holes. Attached Figure Description
[0011] Figure 1 This is an axial schematic diagram of the cemented carbide welding reamer of this utility model;
[0012] Figure 2 This is an enlarged structural diagram of the second and third blades in this utility model;
[0013] Figure 3 This is a radial schematic diagram of the cemented carbide welding reamer of this utility model;
[0014] The components in the diagram are labeled as follows: stepped tool body 1, tool holder 2, cutting surface 3, first step 4, first insert 41, second step 5, second insert 51, first inclined surface 511, second inclined surface 512, third step 6, third insert 61, third inclined surface 611, and chip removal groove 7. Detailed Implementation
[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0016] like Figure 1-3 The present invention relates to a cemented carbide welded reamer, comprising a stepped tool body 1 and a tool holder 2. The tail end of the stepped tool body 1 is fixedly connected to a cylindrical tool holder 2. Two straight cutting surfaces 3 are provided around the stepped tool body 1, both of which are arranged axially and point radially toward the central axis.
[0017] The stepped tool body 1 is also provided with two chip removal grooves 7, which are arranged along the axial direction. The chips generated by the cutting surface 3 are discharged outward through the chip removal grooves 7.
[0018] The cutting surface 3 is a stepped shape with the cutting diameter increasing sequentially, including a first step 4, a second step 5 and a third step 6 arranged sequentially from front to back. The front end of the first step 4 is provided with a first blade 41. The outer edge of the first blade 41 protrudes from the front end face of the stepped tool body 1 and the circumferential surface of the stepped tool body 1, respectively. The outer edge of the first blade 41 is right-angled.
[0019] The transition portion between the first step 4 and the second step 5 is provided with a second blade 51. The front end of the outer edge of the second blade 51 is connected to the first step 4 by a first inclined surface 511, and the rear end is connected to the second step 5 by a second inclined surface 512. The angle between the first inclined surface 511 and the axial direction is 40°, and the angle between the second inclined surface 512 and the axial direction is 30°. The middle part of the outer edge of the second blade 51 is right-angled.
[0020] A third blade 61 is provided at the transition between the second step 5 and the third step 6. The outer edge of the third blade 61 is connected to the second step 5 by a third inclined surface 611. The angle between the third inclined surface 611 and the axial direction is 45°. The outer edge of the third blade 61 protrudes from the third step 6. The cutting inclination angle of the cutting edge of the third blade 61 is 5°.
[0021] The outer cutting edges of the second insert 51 and the third insert 61 are both multi-stage zigzag-shaped. The first insert 41, the second insert 51, and the third insert 61 are all welded to the stepped tool body 1. The stepped tool body 1 and the tool holder 2 are made of carbon structural steel, while the first insert 41, the second insert 51, and the third insert 61 are all made of tungsten-cobalt alloy. Using carbide inserts welded to the stepped tool body 1 gives the cutting edge superior toughness and strength compared to the tool body itself, reducing the rate of tool wear during cutting, lowering machining costs, and extending service life.
[0022] The above descriptions are merely several preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations and substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.
Claims
1. A hard metal welded reamer, characterized in that: The stepped tool body is fixedly connected with a cylindrical tool shank at the tail end, two straight-face cutting surfaces are arranged around the stepped tool body, the cutting surfaces are arranged in the axial direction, and the cutting surfaces point to the central axis in the radial direction; the cutting surfaces are stepped in cutting diameter and sequentially include a first step, a second step and a third step arranged from front to back, the front end of the first step is provided with a first blade, the outer edges of the first blade protrude from the front end surface of the stepped tool body and the peripheral surface of the stepped tool body, and the outer edges of the first blade are straight-angled; the transition part between the first step and the second step is provided with a second blade, the transition part between the second step and the third step is provided with a third blade, the outer edges of the second blade and the third blade are multi-stage broken line-shaped, and the first blade, the second blade and the third blade are welded to the stepped tool body.
2. A cemented carbide welded reamer according to claim 1, characterized in that: The outer edge of the second blade is connected with the first step through a first inclined surface at the front end, and connected with the second step through a second inclined surface at the rear end, the included angle between the first inclined surface and the axial direction is 40°, the included angle between the second inclined surface and the axial direction is 30°, and the middle part of the outer edge of the second blade is straight-angled.
3. A cemented carbide welded reamer according to claim 2, characterized in that: The outer edge of the third blade is connected with the second step through a third inclined surface, the included angle between the third inclined surface and the axial direction is 45°, and the outer edge of the third blade protrudes from the third step.
4. A cemented carbide welded reamer according to claim 3, characterized in that: The cutting inclination angle of the third blade is 5°.
5. A cemented carbide welded reamer according to claim 4, characterized in that: Two chip removal grooves are further arranged on the stepped tool body and arranged in the axial direction, and the cutting chips generated in the machining of the cutting surfaces are discharged outward through the chip removal grooves.
6. A cemented carbide welded reamer according to claim 5, characterized in that: The stepped tool body and the tool shank are made of carbon structural steel, and the first blade, the second blade and the third blade are made of tungsten-cobalt alloy.