CN215966525U - Combined tool for machining fir-shaped blade root groove - Google Patents
Combined tool for machining fir-shaped blade root groove Download PDFInfo
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- CN215966525U CN215966525U CN202121518886.0U CN202121518886U CN215966525U CN 215966525 U CN215966525 U CN 215966525U CN 202121518886 U CN202121518886 U CN 202121518886U CN 215966525 U CN215966525 U CN 215966525U
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Abstract
The utility model provides a combined cutter for machining fir-shaped blade root grooves, which comprises a forming milling cutter and a plane milling cutter, wherein the root of the forming milling cutter is fixedly connected with the plane milling cutter, and the outer diameter of the plane milling cutter is larger than the maximum outer diameter of the forming milling cutter. According to the processing method, the required fir-tree-shaped blade root groove profile can be processed by combining the forming milling cutter and the plane milling cutter only through one-time feeding, so that the processing times are reduced, the efficiency is improved, and the precision of form and position tolerance is improved.
Description
Technical Field
The utility model belongs to the field of cutters, and particularly relates to a combined cutter for machining fir-shaped blade root grooves.
Background
The fir-tree type blade root groove has the characteristics of wide application in medium-pressure and low-pressure rotors of steam turbines, large effective working area and strong bearing capacity, is convenient to disassemble and assemble, and is more in use in the steam turbine industry.
At present, a processing method of the fir-type blade root groove is always the key point and the difficulty of the processing of the steam turbine rotor. The outer circle of the rotor is actually a polygonal broken line structure. The existing finish machining is divided into two parts for processing the surface smoothness of a blade root groove, a plane part and a fir-tree type part are respectively processed, so that the number of times of feed is increased, the efficiency is low, the excessive part of a blade root groove profile is easily jointed and is not smooth after two times of processing, and the form and position tolerance of the two parts of profiles cannot be guaranteed, so that negative influence is caused to the assembly work of a steam turbine.
The patent with application number CN201010151318.1 discloses a composite milling cutter of fir-tree type blade root race processing, its stalk portion end at composite milling cutter is fixed to be set up the cutting part that is used for fir-tree type blade root race processing to with the milling sword shovel to be worn into the trapezoidal chip groove of ripples sword formation circular arc, in order to do benefit to rotor material smear metal chip breaking and chip removal, but above-mentioned composite milling cutter only can process fir-tree type part, need set up the secondary operation and just can process the planar part in fir-tree type blade root race.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides the combined tool for machining the fir-shaped blade root groove, so as to reduce the machining times of the fir-shaped blade root groove, improve the efficiency and solve the technical problem that the form and position tolerance cannot be ensured.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a gang tool for processing fir type leaf root groove, includes shaping milling cutter and face milling cutter, the root and the face milling cutter fixed connection of shaping milling cutter, face milling cutter's external diameter is greater than the biggest external diameter of shaping milling cutter.
Further, the forming milling cutter is in threaded connection with the face milling cutter.
Furthermore, an external thread is arranged on one side, close to the cutting edge, of the thrust part of the forming milling cutter, an internal thread is arranged in the center of the plane milling cutter, and the external thread is matched with the internal thread.
Furthermore, the screwing direction of the external thread is consistent with that of the internal thread, and the screwing direction is the same as the direction of resistance to cutting of the cutter.
Further, the internal thread and the external thread are fine threads.
Further, the thickness of the face mill is equal to the height from the cutting edge of the profile mill to the root of the external thread.
Furthermore, the profile of the excircle cutting edge of the face milling cutter is consistent with that of the cutting edge of the forming milling cutter.
Compared with the prior art, the utility model has the beneficial effects that: through with shaping milling cutter and face milling cutter fixed connection, only need the feed once can process out fir type blade root groove, compare with twice processing, once processing has improved the precision of form and position tolerance.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the formed milling cutter of the present invention;
FIG. 3 is a schematic view of a face milling cutter according to the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1. fir-shaped blade root groove, 2, forming milling cutter, 3 and plane milling cutter.
Detailed Description
The present invention is further described in detail below with reference to specific examples so that those skilled in the art can more clearly understand the present invention.
As shown in fig. 1 to 3, the combination tool for machining fir tree type blade root slots comprises a forming milling cutter 2 and a face milling cutter 3, wherein the root of the forming milling cutter 2 is fixedly connected with the face milling cutter 3, and the outer diameter of the face milling cutter 3 is larger than the maximum outer diameter of the forming milling cutter 2.
The existing two-time processing is the independent processing of the formed milling cutter and the plane milling cutter, the two-time processing is reduced to one-time processing by fixedly connecting the formed milling cutter 2 and the plane milling cutter 3, the processing times are reduced, and compared with the two-time processing, the one-time processing improves the precision of form and position tolerance.
In a preferred technical scheme, the forming milling cutter 2 is in threaded connection with the face milling cutter 3, so that the forming milling cutter 2 or the face milling cutter 3 can be replaced conveniently, and further the combination cutter of the utility model can be used for processing fir-type leaf root groove profiles with different processing requirements.
Specifically, an external thread is formed on one side, close to the cutting edge, of the thrust portion of the forming milling cutter 2, an internal thread is formed in the center of the face milling cutter 3, and the external thread is matched with the internal thread. The screwing direction of the external thread is consistent with that of the internal thread, and the screwing direction is the same as the direction of resistance to cutting of the cutter. During cutting, the cutting resistance is consistent with the screwing direction, so that the formed milling cutter 2 and the plane milling cutter 3 can be further screwed by the cutting resistance, and the anti-loosening effect is improved.
Preferably, the internal thread and the external thread are fine threads, and the fine threads have better anti-loosening capacity than coarse threads.
In order to ensure that the plane part of the fir-tree type blade root groove 1 and the fir-tree type part are excessively natural, the thickness of the plane milling cutter 3 is equal to the height from the cutting edge of the forming milling cutter 2 to the root part of the external thread, so that the neutral position of the molded lines of the two milling cutters can be eliminated, and a continuous fir-tree type blade root groove 1 molded line is formed, excessively natural and smoothly jointed.
The profile of the excircle cutting edge of the plane milling cutter 3 is consistent with the profile of the cutting edge of the forming milling cutter 2, so that the plane milling cutter 3 becomes an extension of the forming milling cutter 2 to form a complete fir-shaped blade root groove 1 profile to improve the surface quality of the blade root groove.
The working principle is as follows: the face milling cutter 3 is screwed to the root of the profile milling cutter 2, and then the gang tool is mounted on a machining device to feed a workpiece.
The mechanisms, components and parts of the present invention which are not described in detail are all the existing structures which exist in the prior art. Can be purchased directly from the market.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The combined cutter for machining the fir-tree-shaped blade root grooves is characterized by comprising a forming milling cutter (2) and a plane milling cutter (3), wherein the root of the forming milling cutter (2) is fixedly connected with the plane milling cutter (3), and the outer diameter of the plane milling cutter (3) is larger than the maximum outer diameter of the forming milling cutter (2).
2. A combination tool for machining fir tree root flutes according to claim 1, characterized in that the profile cutter (2) is screwed to the face cutter (3).
3. The gang tool for machining fir-tree type blade root flutes as claimed in claim 2, wherein the side of the thrust portion of the profile cutter (2) near the cutting edge is externally threaded, and the center of the face cutter (3) is internally threaded, the external threads and the internal threads being engaged.
4. The gang tool for machining fir-tree type root flutes according to claim 3, wherein the external thread and the internal thread are screwed in the same direction, and the screwing direction is the same as the direction of resistance to cutting by the tool.
5. The gang tool for machining fir-tree root flutes of claim 3, wherein the internal and external threads are fine pitch threads.
6. A gang tool for machining fir-tree type root flutes according to claim 3, characterized in that the thickness of the face mill (3) is equal to the height of the cutting edge of the profile mill (2) to the root of the external thread.
7. A combination tool for machining fir tree root flutes according to claim 1, characterized in that the profile of the outer circle cutting edge of the face mill (3) and the cutting edge of the profile mill (2) is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121518886.0U CN215966525U (en) | 2021-07-05 | 2021-07-05 | Combined tool for machining fir-shaped blade root groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121518886.0U CN215966525U (en) | 2021-07-05 | 2021-07-05 | Combined tool for machining fir-shaped blade root groove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215966525U true CN215966525U (en) | 2022-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121518886.0U Active CN215966525U (en) | 2021-07-05 | 2021-07-05 | Combined tool for machining fir-shaped blade root groove |
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| CN (1) | CN215966525U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114850552A (en) * | 2022-05-07 | 2022-08-05 | 哈尔滨工诚科技有限公司 | Multi-processing mode combined type mechanical part processing device |
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2021
- 2021-07-05 CN CN202121518886.0U patent/CN215966525U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114850552A (en) * | 2022-05-07 | 2022-08-05 | 哈尔滨工诚科技有限公司 | Multi-processing mode combined type mechanical part processing device |
| CN114850552B (en) * | 2022-05-07 | 2022-12-13 | 陕西科迪机械设备有限公司 | Multi-processing mode combined type mechanical part processing device |
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