CN113510299B

CN113510299B - Inner-cooling hard alloy blade type broach single section and complete set of broach

Info

Publication number: CN113510299B
Application number: CN202110258842.7A
Authority: CN
Inventors: 向志杨; 谢鸿; 贠庆芳; 邓亚弟; 税妍; 杨德存; 王春江; 薛强; 王庆国; 王强; 文小山; 朱永祥; 唐仕东; 冷进明; 芮楠; 夏利刚; 孙惠芳
Original assignee: DEC Dongfang Turbine Co Ltd
Current assignee: DEC Dongfang Turbine Co Ltd
Priority date: 2021-03-10
Filing date: 2021-03-10
Publication date: 2022-09-27
Anticipated expiration: 2041-03-10
Also published as: CN113510299A

Abstract

The invention discloses an inner-cooling hard alloy blade type broach single section and a set of broach, which comprises a broach body, wherein a plurality of blades and chip grooves are arranged on the broach body in rows, and the chip grooves and the blades are arranged at intervals; the broach is characterized in that an inner cooling channel is arranged in the broach body along the length direction of the broach body, the chip groove is provided with a nozzle channel communicated with the inner cooling channel, a nozzle is arranged in the nozzle channel, and a nozzle facing the blade edge is arranged on the nozzle. By adopting the single-section and the complete set of the inner-cooling hard alloy blade type broach, provided by the invention, the broaching oil can be injected into the cutting edge of the blade, the service life of the broach is prolonged, and the processing quality is improved.

Description

Inner-cooling hard alloy blade type broach single section and complete set of broach

Technical Field

The invention relates to an inner-cooling hard alloy blade type broach single section and a set of broaches, in particular to an inner-cooling hard alloy blade type broach single section and a set of broaches for broaching a wheel disc groove of a high-temperature alloy gas turbine, and belongs to the technical field of gas turbine machining.

Background

With the continuous development and progress of science and technology and the national requirements for the development strategy planning and the development of clean energy of gas turbines, the technical parameters of the gas turbines are continuously improved, turbine wheel discs of the gas turbines are used as key high-temperature components, and the gas turbines are manufactured by using integral high-temperature alloy materials in order to adapt to the high-parameter requirements. In order to achieve efficient and high-quality machining, the disc grooves are usually machined by broaching. However, because the turbine disk is made of high-temperature alloy and the cutting is in a closed state in the broaching process, as in the Chinese patent application: 201911323900.9, the broaching oil can not enter the cutting area effectively, resulting in fast wear of the broach edge, short life, poor surface quality of the broaching wheel groove and hardening.

Meanwhile, the broach with larger length is difficult to manufacture integrally, so that the production and the preparation of the broach are not facilitated.

Disclosure of Invention

The invention aims to: aiming at the existing problems, the invention provides an inner-cooling hard alloy blade type broach single section and a set of broaches.

The technical scheme adopted by the invention is as follows:

the inner-cooling hard alloy blade type broach single section comprises a broach body, wherein a plurality of blades and chip grooves are arranged on the broach body in rows, and the chip grooves and the blades are arranged at intervals;

the broach is characterized in that an inner cooling channel is arranged in the broach body along the length direction of the broach body, the chip groove is provided with a nozzle channel communicated with the inner cooling channel, a nozzle is arranged in the nozzle channel, and a nozzle facing the blade edge is arranged on the nozzle.

In the invention, the inner cooling channel, the nozzle channel and the nozzle are arranged, the broaching oil is injected into the inner cooling channel and enters the nozzle through the nozzle channel, and finally the broaching oil is sprayed out of the nozzle to the cutting area of the cutting edge of the cutter blade, so that the abrasion of the cutter blade can be reduced, the service life of a single section of the broach is prolonged, and the surface quality of the broaching wheel groove is improved.

Preferably, the nozzle is threadedly connected to the nozzle passage.

In the scheme, the pull cutter body and the nozzle are manufactured independently, the manufacturing difficulty is reduced, and the nozzle is connected with the nozzle channel through M5 threads.

Preferably, each row of blades comprises a plurality of blades, and the nozzle is provided with a plurality of nozzles facing the plurality of blades respectively.

Preferably, each row of blades comprises two blades, and two nozzles facing the two blades are arranged on the nozzle.

In the scheme, the plurality of nozzles respectively spray the broaching oil to each blade, so that each blade can be lubricated by the broaching oil.

Preferably, the diameter of the oil inlet of the nozzle is d2, the diameter of the nozzle is d1, and d2/d1 is more than or equal to 2.

Preferably, d2/d1 is 3.5-4.5.

In the scheme, the d2 is less than or equal to 3.5, the larger the value of d2/d1 is, the higher the pressure of the broaching oil sprayed by the nozzle is, but the manufacturing difficulty is also higher; based on the comprehensive consideration of oil injection pressure and manufacturing difficulty, when d2/d1 is 3.5-4.5, good oil injection pressure is achieved for spraying the blade edge, and meanwhile, the manufacturing difficulty is not high.

Preferably, the nozzle channel is located in the middle of the chip groove on the side close to the blade edge.

In the above scheme, be close to the blade and make oil spout distance shorter, the broaching oil spouts on the blade more easily.

Preferably, the nozzle channel is vertically arranged and is perpendicular to the inner cooling channel.

In above-mentioned scheme, vertical setting is easily processed, sets up the angle of spout easily simultaneously.

Preferably, the inner cooling channel is located in the middle of the broach body in the width direction.

In the scheme, the thicknesses of the two sides of the inner cooling channel are consistent, so that the structural strength of the broach is stable.

Preferably, the inner wall of the inner cooling channel is smooth.

In the above solution, the smooth inner wall utilizes the flow of the broaching oil.

Preferably, the inner cooling passage penetrates both ends of the pulling blade body.

Preferably, the blade is made of hard alloy, and the broach body is made of steel.

In above-mentioned scheme, set up the performance that the carbide blade can guarantee the blade, the broach physical stamina of steel simultaneously can reduce the manufacturing cost of broach.

Preferably, the length of the single section of the broach is 295-300mm, the width w of the broach body is more than or equal to 20mm, and the diameter of the inner cooling channel is more than or equal to phi 6 mm.

In the scheme, when the length of the single section of the broach is set to 295 plus 300mm, the manufacturing difficulty of the single section of the broach can be reduced, the deformation of the single-section broach body is reduced, and the required length of the broach can be conveniently achieved by combining multiple sections of the single section of the broach when the broach is used.

It should be noted that the present invention is only suitable for the broach with the broach body width w not less than 20mm, and for the broach with the broach body width w less than 20mm, the strength of the broach body after the inner cooling channel is arranged is not enough, and the present invention is not suitable for the arrangement of the inner cooling channel.

When the width of the broaching tool body is 20mm, the diameter of the inner cooling channel is phi 6mm, and when the width of the broaching tool body is more than 20mm, the diameter of the inner cooling channel is proportionally increased so as to ensure the strength of a single section of the broaching tool and ensure the injection amount of broaching oil.

The invention also comprises an inner-cooling hard alloy blade type broach which is formed by combining a plurality of inner-cooling passages sequentially communicated with the broach single sections through connectors.

In the invention, the manufacturing difficulty of the broach is higher as the length of the broach is longer, the broach is combined by communicating a plurality of single sections, the manufacturing difficulty of the broach can be reduced, and simultaneously, the broaching oil can be provided for the single sections of the multiple sections of the broach simultaneously through the communicated inner cooling channels, so that the abrasion of the blade can be reduced, the service life of the broach is prolonged, and the surface quality of the broaching wheel groove is improved.

Preferably, the connector is a pipe joint, one end of the pipe joint is provided with threads, and the other end of the pipe joint is provided with a sealing ring.

In the scheme, the inner cooling channel of the complete set of broaches consisting of the single broach section is sealed and smooth, and the complete set of broaches realize the inner cooling function.

Preferably, the connector is an 1/8 pipe joint, one end of the connector is 1/8 pipe threads, and the other end of the connector is provided with a sealing ring.

In the above scheme, the end of the connector provided with the sealing ring is connected with the last broach single joint (in the direction of injecting the broaching oil) so as to avoid the overflow of the broaching oil from the connector.

Preferably, one end of the broach is provided with a plug, and the other end of the broach is provided with an oil filling opening, and more preferably, the plug is a threaded plug.

In the scheme, the plug is arranged to enable one end to be closed, and the broaching oil is injected from the oil injection port and is sprayed out from the nozzle.

According to the inner-cooling hard alloy blade type broach single section and the set of broach, the broach is formed by combining the multiple broach single sections, so that the manufacturing difficulty can be reduced; simultaneously, the broaching oil is injected into the inward cooling channel, so that the broaching oil can be sprayed to the blade edge in the cutting process of the broaching tool, the abrasion of the blade edge is reduced, the service life of the broaching tool is prolonged, and the surface quality of the broaching wheel groove is improved.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the manufacturing difficulty and the manufacturing cost of the broach are reduced;

2. the abrasion of the cutting edge of the blade can be reduced, the service life of the broaching tool is prolonged, and the surface quality of the broaching wheel groove is improved.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic sectional view of a single segment of a broach;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a partial top view of a single segment of the broach;

FIG. 4 is a cross-sectional view of the nozzle;

FIG. 5 is a schematic view of a broach connection;

FIG. 6 is an enlarged view of a portion of FIG. 5;

fig. 7 is a top view of the broach after it has been connected.

The mark in the figure is: 1-pulling a cutter body, 2-blades, 3-chip flutes, 4-internal cooling channels, 5-nozzles, 6-connectors, 7-plugs, 8-oil injection ports, 21-blade cutting edges, 31-nozzle channels, 51-nozzles, 52-oil inlets and 61-sealing rings.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

Example 1

As shown in fig. 1, the single-segment inner-cooling hard alloy blade type broach of the present embodiment includes a broach body 1, a plurality of blades 2 and chip flutes 3 arranged in a row on the broach body 1, and the chip flutes 3 and the blades 2 arranged at intervals;

as shown in fig. 2, an inner cooling channel 4 is arranged in the broach body 1 along the length direction of the broach body 1, a nozzle channel 31 communicated with the inner cooling channel 4 is arranged in the chip pocket 3, a nozzle 5 is arranged in the nozzle channel 31, and a nozzle 51 facing the blade edge 21 is arranged on the nozzle 5;

the length of the single section of the broach is 300mm, the width w of the broach body 1 is 20mm, and the diameter of the inner cooling channel 4 is phi 6 mm.

In the embodiment, the inner cooling channel 4, the nozzle channel 31 and the nozzle 5 are arranged, the broaching oil is injected into the inner cooling channel 4 and flows to the nozzle 5 through the nozzle channel 31, and finally the broaching oil is sprayed out from the nozzle 51 to the cutting area of the blade edge 21, so that the abrasion of the blade 2 can be reduced, the service life of a single broach segment is prolonged, and the surface quality of a broaching wheel groove is improved.

When the broach is used, the multiple sections of single sections can be connected for use as required, and certainly, one section can be used independently, so that the manufacturing difficulty of the single section of the broach can be reduced, and the length of the broach can be conveniently reached by combining the multiple sections of the single section of the broach when the broach is used.

As a further alternative to the above embodiment, in other embodiments, the nozzle 5 is connected to the nozzle channel 31 by a screw thread, the broach body 1 and the nozzle 5 are manufactured separately, so as to reduce the manufacturing difficulty, and the nozzle 5 is connected to the nozzle channel 31 by an M5 screw thread.

As a further alternative to the above-described embodiment, as shown in fig. 3-4, in other embodiments, each row of blades 2 comprises two blades 2, and the nozzle 5 is provided with two nozzles 51 facing the two blades 2, respectively, so as to spray the broaching oil toward the blades 2 through the two nozzles 51, respectively, thereby ensuring that each blade 2 can be lubricated by the broaching oil.

As a further alternative of the above embodiment, in other embodiments, the diameter of the oil inlet 52 of the nozzle 5 is d2, the diameter of the nozzle (51) is d1, and d2/d1 is greater than or equal to 2, preferably, d2/d1 is 3.5-4.5, d2 is less than or equal to 3.5, and the larger the value of d2/d1 is, the higher the pressure of the broaching oil sprayed out from the nozzle 51 is, but the difficulty of manufacturing is also higher; based on the comprehensive consideration of oil injection pressure and manufacturing difficulty, when d2/d1 is 3.5-4.5, good oil injection pressure is achieved for spraying the blade edge 21, and meanwhile, the manufacturing difficulty is not high.

As a further alternative to the above-described embodiment, in other embodiments, the nozzle channel 31 is located in the middle of the chip pocket 3 on the side closer to the blade edge 21, so that the oil spray distance is shorter and the broaching oil is more easily sprayed onto the blade edge 21.

As a further alternative to the above embodiment, in other embodiments, the nozzle channel 31 is vertically disposed and perpendicular to the internal cooling channel 4, the internal cooling channel 4 is located in the middle of the broach body 1 in the width direction, and the thicknesses of two sides of the internal cooling channel 4 are the same, so that the structural strength of the broach is stable.

As a further alternative to the above described embodiments, in other embodiments the inner walls of the inner cooling passages 4 are smooth, utilizing a flow of broaching oil.

As a further alternative to the above-described embodiment, in other embodiments, the internal cooling channel 4 penetrates both ends of the pulling blade body 1.

As a further alternative of the above embodiment, in other embodiments, the material of the insert 2 is cemented carbide, the material of the broach body 1 is steel, the provision of the cemented carbide insert 2 can ensure the usability of the insert 2, and the steel broach body 1 can reduce the manufacturing cost of the broach.

As a further alternative of the above embodiment, in other embodiments, the length of the single broach unit may be 295 plus another length of 300mm, the width w of the broach body 1 is another value equal to or greater than 20mm, and the diameter of the inner cooling channel 4 is another value equal to or greater than 6 mm. When the width of the broach body 1 is 20mm, the diameter of the inner cooling channel 4 is phi 6mm, and when the width of the broach body 1 is larger than 20mm, the diameter of the inner cooling channel 4 is proportionally increased so as to ensure the strength of a single section of the broach and ensure the injection amount of broaching oil.

Example 2

As shown in fig. 5 and 7, the present embodiment includes an inner-cooling cemented carbide blade type broach, in which the inner-cooling cemented carbide blade type broach in the above-mentioned embodiment is used as a single-segment broach, and the broach is formed by combining two broach single-segments which are communicated with an inner-cooling channel 4 through a connector 6, so that the inner-cooling channel of the set of broach formed by the broach single-segments is sealed and smooth, and the set of broach realizes the inner-cooling function;

an oil filling port 8 is arranged on the inner cooling channel 4 at one end of the broach, and a plug 7 is arranged at the other end of the inner cooling channel.

In this embodiment, a plurality of single segments are communicated and combined to form the broach, so that the manufacturing difficulty of the broach can be reduced, and simultaneously, the inner cooling channel 4 which is communicated can provide broaching oil for the single segments of the multi-segment broach simultaneously, thereby reducing the abrasion of the blade 2, prolonging the service life of the broach and improving the surface quality of the broaching wheel groove.

Of course, in other embodiments, other numbers of single sections of the broach may be connected to form the broach.

As a further alternative to the above embodiment, as shown in fig. 6, in another embodiment, the connector 6 is an 1/8 pipe joint, one end is a 1/8 pipe thread, the other end is provided with a sealing ring 61, and the end of the connector 6 provided with the sealing ring 61 is connected with the previous single broach joint (in the direction of broach oil injection) to avoid the broach oil from overflowing from the joint.

In conclusion, the single-section inner-cooling hard alloy blade type broach and the set of broach reduce the manufacturing difficulty and cost of the broach; the abrasion of the cutting edge of the blade can be reduced, the service life of the broaching tool is prolonged, and the surface quality of the broaching wheel groove is improved.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of steps disclosed.

Claims

1. The utility model provides an interior cold carbide blade formula broach list festival which characterized in that: the broaching machine is applied to broaching of a turbine wheel disc of a gas turbine and comprises a broaching tool body (1), wherein a plurality of blades (2) and chip flutes (3) which are arranged in rows are arranged on the broaching tool body (1), and the chip flutes (3) and the blades (2) are arranged at intervals;

an inner cooling channel (4) is arranged in the pull cutter body (1) along the length direction of the pull cutter body (1), the chip groove (3) is provided with a nozzle channel (31) communicated with the inner cooling channel (4), a nozzle (5) is arranged in the nozzle channel (31), and a nozzle (51) facing the blade cutting edge (21) is arranged on the nozzle (5);

the broach is characterized by further comprising a connector (6) for connecting the broach single section, and an inner cooling channel (4) communicated with the connector (6) inside the broach single section.

2. The internally cooled cemented carbide insert-type broach segment of claim 1, wherein: the nozzle (5) is connected with the nozzle channel (31) through threads.

3. The internally cooled cemented carbide insert-type broach segment of claim 1, wherein: each row of blades (2) comprises two blades (2), and two nozzles (51) facing the two blades (2) are arranged on the nozzle (5).

4. The internally cooled cemented carbide insert-type broach segment of claim 1, wherein: the diameter of an oil inlet (52) of the nozzle (5) is d2, the diameter of the nozzle (51) is d1, and d2/d1 is more than or equal to 2.

5. The internally cooled cemented carbide insert-type broach segment of claim 1, wherein: the nozzle channel (31) is positioned at the side of the middle part of the chip groove (3) close to the blade cutting edge (21).

6. The internally cooled cemented carbide insert-type broach segment of claim 1, wherein: the blade (2) is made of hard alloy, and the pull knife body (1) is made of steel.

7. The internally cooled cemented carbide insert-type broach segment of claim 1, wherein: the length of the single section of the broach is 295-300mm, the width w of the broach body (1) is more than or equal to 20mm, and the diameter of the inner cooling channel (4) is more than or equal to phi 6 mm.

8. An internally-cooled cemented carbide insert-type broach using the internally-cooled cemented carbide insert-type broach unit according to any one of claims 1 to 7, characterized in that: the broach is a plurality of broach single section is through connector (6) intercommunication interior cold passageway (4) combination formation in proper order.

9. The internally cooled cemented carbide insert-type broach according to claim 8, characterized in that: the connector (6) is a pipe joint, one end of the connector is provided with threads, and the other end of the connector is provided with a sealing ring (61).

10. The internally cooled cemented carbide insert broach according to claim 8, in which: one end of the broach is provided with a plug (7), and the other end is provided with an oil filling port (8).