阅读说明：本技术 一种燃气轮机轮盘拉削用窄槽拉刀 (Gas turbine rim plate is narrow groove broach for broaching ) 是由 向志杨 谢鸿 朱永祥 邓亚弟 贠庆芳 税妍 杨德存 王春江 王强 文小山 薛强 于 2020-10-23 设计创作，主要内容包括：本发明公开一种燃气轮机轮盘拉削用窄槽拉刀,包括刀体,所述刀体从左到右沿长度方向均匀设置有若干刀片槽,所述刀片槽内设置有刀片,所述刀片包括前压紧面、下压紧面,后压紧面,所述刀片槽包括有与刀片前压紧面配合的前定位面,与下压紧面配合的下定位面,与后压紧面配合的后定位面,所述前定位面和下定位面之间设置有应力槽；任一所述刀片槽左侧设置有螺钉孔,所述螺钉孔开孔端设置有受力锥面,螺钉孔内设置锥形螺钉；所述螺钉孔与刀片槽、应力槽之间形成压板。能够满足燃气轮机窄槽高效拉削需求。(The invention discloses a narrow groove broach for broaching a wheel disc of a gas turbine, which comprises a cutter body, wherein a plurality of blade grooves are uniformly arranged on the cutter body from left to right along the length direction, blades are arranged in the blade grooves, each blade comprises a front pressing surface, a lower pressing surface and a rear pressing surface, each blade groove comprises a front positioning surface matched with the front pressing surface of each blade, a lower positioning surface matched with the lower pressing surface and a rear positioning surface matched with the rear pressing surface, and a stress groove is arranged between the front positioning surface and the lower positioning surface; a screw hole is formed in the left side of any blade groove, a stress conical surface is arranged at the opening end of the screw hole, and a conical screw is arranged in the screw hole; and a pressing plate is formed among the screw hole, the blade groove and the stress groove. Can meet the high-efficient broaching demand of gas turbine slot.)

1. A narrow groove broach for broaching a wheel disc of a gas turbine comprises a cutter body (1), wherein a plurality of blade grooves (4) are uniformly formed in the cutter body (1) from left to right along the length direction, and blades (3) are arranged in the blade grooves (4), and the narrow groove broach is characterized in that each blade (3) comprises a front pressing surface (31), a lower pressing surface (32) and a rear pressing surface (33), each blade groove (4) comprises a front positioning surface (41) matched with the front pressing surface (31) of each blade (3), a lower positioning surface (42) matched with the lower pressing surface (32) and a rear positioning surface (43) matched with the rear pressing surface (33), and a stress groove (5) is formed between the front positioning surface (41) and the lower positioning surface (42); a screw hole (6) is formed in the left side of any one of the blade grooves (4), a stress conical surface (7) is arranged at the opening end of the screw hole (6), and a conical screw (2) is arranged in the screw hole (6); and a pressing plate (8) is formed among the screw hole (6), the blade groove (4) and the stress groove (5).

2. The gas turbine disk broaching narrow groove broach according to claim 1, wherein the presser plate (8) includes a pressing blade face (81), and the pressing blade face (81) is a front positioning face (41) of the blade groove (4); in an uncompacted state, the clearance between the pressing blade surface (81) and the front pressing surface (31) of the blade is less than or equal to 0.01 mm; after the pressing, the gap between the pressing blade surface (81) and the front pressing surface (31) of the blade is 0 mm.

3. The gas turbine disk broaching narrow groove broach according to claim 2, characterized in that in an uncompacted state, the included angle between the dihedral angle of the pressing blade face (81) and the front pressing face (31) of the blade is less than or equal to 1 °; after the pressing, the included angle between the dihedral angle of the pressing blade surface (81) and the front pressing surface (31) of the blade is 0.

4. The gas turbine wheel disc broaching narrow groove broach according to claim 3, characterized in that, in an uncompressed state, the included angle of the stress conical surface (7) is 2-3 ° smaller than the included angle of the top conical surface of the conical screw (2); after the compression, the included angle of the stress conical surface (7) is equal to the included angle of the top conical surface of the conical screw (2).

5. The gas turbine wheel disc broaching narrow groove broach according to any one of claims 1 to 4, characterized in that, the perpendicular distance from the stress point of the conical screw (2) and the pressure plate (8) to the center of the stress groove (5) is H1, and the perpendicular distance from the stress point of the conical screw (2) and the pressure plate (8) to the stress point of the pressure plate (8) and the blade (3) is H2; the value of H1/H2 is 1.5 or more.

6. The gas turbine disk broaching narrow groove broach according to claim 5, characterized in that the minimum thickness L1 of the pressure plate (8) is 3-4 mm.

7. The gas turbine disk broaching narrow groove broach according to any one of claims 1 to 4 or 6, characterized in that the length of the broach body (1) is 300 mm.

8. The gas turbine wheel disc broaching narrow groove broach according to claim 7, characterized in that 10 insert grooves (4) are sequentially arranged on the broach body from left to right at different spatial positions as required, and one insert (3) is installed in any one insert groove (4).

9. The gas turbine disk broaching narrow groove broach according to claim 1, characterized in that the insert (3) is made of cemented carbide.

Technical Field

The invention belongs to the technical field of machining, and particularly relates to high-efficiency broaching of a narrow groove of a high-temperature alloy wheel disc of a gas turbine, wherein the groove width W is not more than 6mm, and the broaching can be used under similar working conditions.

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, the material is high-temperature alloy, the high-speed steel broach cannot meet the requirement of broaching efficiency, and therefore the hard alloy blade type broach is developed. The wide groove uses a hard alloy blade type broach, and the installation and the compaction of the blade and the manufacture of the cutter body are relatively reliable. However, the groove at the bottom of the wheel disc is relatively deep, and the groove with the width not more than 6mm is machined, and for broaching the groove, a hard alloy blade type broach is used, so that the strength of a cutter body is difficult to meet the requirement.

Disclosure of Invention

The technical problem solved by the invention is as follows: the utility model provides a gas turbine rim plate is narrow groove broach for broaching to satisfy the high-efficient broaching demand of gas turbine narrow groove.

The technical scheme adopted by the invention is as follows:

a narrow groove broach for broaching a wheel disc of a gas turbine comprises a cutter body, wherein a plurality of blade grooves are uniformly formed in the cutter body from left to right along the length direction, blades are arranged in the blade grooves, each blade comprises a front pressing surface, a lower pressing surface and a rear pressing surface, each blade groove comprises a front positioning surface matched with the front pressing surface of each blade, a lower positioning surface matched with the lower pressing surface and a rear positioning surface matched with the rear pressing surface, and a stress groove is formed between the front positioning surface and the lower positioning surface; a screw hole is formed in the left side of any blade groove, a stress conical surface is arranged at the opening end of the screw hole, and a conical screw is arranged in the screw hole; and a pressing plate is formed among the screw hole, the blade groove and the stress groove.

Preferably, the pressing plate comprises a pressing blade surface, the pressing blade surface is a front positioning surface of the blade groove, and a gap between the pressing blade surface and the front pressing surface of the blade is less than or equal to 0.01mm in an uncompacted state; after the pressing, the gap between the pressing blade surface (81) and the front pressing surface (31) of the blade is 0 mm.

Preferably, under the non-compression state, the included angle between the dihedral angle of the compression blade surface and the front compression surface of the blade is smaller than or equal to 1 degree, and after compression, the included angle between the dihedral angle of the compression blade surface (81) and the front compression surface (31) of the blade is 0.

Preferably, under the non-compression state, the included angle of the stress conical surface is 2-3 degrees smaller than that of the conical surface at the top of the conical screw, and after compression, the included angle of the stress conical surface (7) is equal to that of the conical surface at the top of the conical screw (2).

Preferably, the vertical distance from the stress point of the conical screw and the pressure plate to the center of the stress groove is H1, and the vertical distance from the stress point of the conical screw and the pressure plate to the stress point of the pressure plate and the blade is H2; the value of H1/H2 is 1.5 or more.

Preferably, the minimum thickness L1 of the pressing plate is 3-4 mm.

Preferably, the length of the cutter body is 300 mm.

Preferably, 10 blade grooves are sequentially arranged on the cutter body from left to right at different spatial positions according to requirements, and 1 blade is installed in any one blade groove.

Preferably, the blade is made of hard alloy.

According to the narrow groove broach for broaching the wheel disc of the gas turbine, the hard alloy blade is arranged in the blade groove on the cutter body, and the blade can be freely assembled and disassembled in the state that the conical screw is not tightly pressed. After the blade is installed, the conical screw is screwed downwards, the conical screw applies pressure to the pressing plate integrally formed with the cutter body, and the pressing plate generates elastic deformation so as to press the blade in the blade groove. According to the invention, the stress groove is arranged in the blade groove, the pressing plate is formed between the blade groove and the screw hole, and the top of the screw hole is the stress conical surface, so that the pressing plate and the cutter body are integrally formed, and the pressing plate is not required to be additionally arranged, so that the narrow groove broach with the groove width W smaller than 6mm can be formed. And the blade can be freely assembled and disassembled, so that when the blade is damaged or worn, the blade can be directly replaced, and the cutter body can be repeatedly used.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is an enlarged view of I in FIG. 3;

FIG. 5 is a cross-sectional view A-A of FIG. 3;

FIG. 6 is a schematic view of the blade of FIG. 5 II in an uncompressed state;

FIG. 7 is a schematic view of the blade pressing state of II in FIG. 5;

FIG. 8 is a force analysis diagram of the blade compression state of FIG. 5 II;

wherein, the names corresponding to the reference numbers are:

1-cutter body, 2-conical screw, 3-blade, 31-front pressing surface, 32-lower pressing surface, 33-rear pressing surface, 4-blade groove, 41-front positioning surface, 42-lower positioning surface, 43-rear positioning surface, 5-stress groove, 6-screw hole, 7-stress conical surface, 8-pressing plate, 81-pressing blade surface and 82-screw pressing plate surface.

Detailed Description

The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.

Example 1

A gas turbine wheel disc broaching narrow groove broach is shown in figures 1-8 and comprises a cutter body 1, wherein a plurality of blade grooves 4 are uniformly formed in the cutter body 1 from left to right along the length direction, blades 3 are arranged in the blade grooves 4, each blade 3 comprises a front pressing surface 31, a lower pressing surface 32 and a rear pressing surface 33, as shown in figure 6, each blade groove 4 comprises a front positioning surface 41 matched with the front pressing surface 31 of each blade, a lower positioning surface 42 matched with the lower pressing surface 32 and a rear positioning surface 43 matched with the rear pressing surface 33, and a stress groove 5 is formed between the front positioning surface 41 and the lower positioning surface 42; a screw hole 6 is formed in the left side of any one of the blade grooves 4, a stress conical surface 7 is arranged at the opening end of the screw hole 6, and a conical screw 2 is arranged in the screw hole 6 as shown in fig. 4; and a pressing plate 8 is formed among the screw hole 6, the insert groove 4 and the stress groove 5.

The invention provides a narrow groove broach for broaching a wheel disc of a gas turbine, which comprises a cutter body 1 as shown in figures 1-8, wherein the cutter body 1 is uniformly provided with a plurality of blade grooves 4 along the length direction from left to right for placing blades 3, each blade 3 comprises a front pressing surface 31 and a rear pressing surface 33 which are arranged on two side surfaces, and a lower pressing surface 32 which is arranged at the bottom of the blade 3, and the blade is matched with a front positioning surface 41, a rear positioning surface 43 and a lower positioning surface 42 in the blade grooves 4, wherein the front pressing surface 31 of the blade is matched with the front positioning surface 41, the lower pressing surface 32 is matched with the lower positioning surface 42, and the rear pressing surface 33 is matched with the rear positioning surface 43, so that the position of the blade 3 in the blade grooves 4 is accurately determined, and the top of the blade 3 is also provided with a cutting edge for cutting; meanwhile, a stress groove 5 is arranged between the front positioning surface 41 and the lower positioning surface 42 in the insert groove 4; a screw hole 6 is formed in the left side of any one of the blade grooves 5, a stress conical surface 7 is arranged at the opening end of the screw hole 6, and a conical screw 2 is arranged in the screw hole 6; and a pressing plate 8 is formed among the screw hole 6, the insert groove 4 and the stress groove 5. Therefore, when the conical screw 2 in the screw hole 6 is screwed down, the conical screw 2 applies pressure to the force-receiving conical surface 7, and a part of the force-receiving conical surface 7 is a screw pressing plate surface 82 of the pressing plate, so that the pressing plate 8 is elastically deformed to press the insert 3 in the insert groove 4, thereby achieving the fastening and installation of the insert 3. The blade 3 is pressed on the cutter body 1 by adopting the combination of the upper pressure plate 8 of the cutter body 1 and the conical screw 2, the pressure plate 8 and the cutter body 1 are integrated, a narrow groove broach with the groove width W being less than 6mm can be formed, and the requirement of efficient broaching of the narrow groove of the gas turbine can be met. The narrow groove broach is reasonable in design, free assembly and disassembly can be achieved when the blade 3 is not in a compressed state, when the blade 3 is worn in use, a new blade with the same specification can be directly replaced for continuous use, and the broach body 1 can be repeatedly used for multiple times.

Example 2

Based on the above embodiment 1, as shown in fig. 6, the pressing plate 8 includes a pressing blade surface 81, the pressing blade surface 81 is the front positioning surface 41 of the blade groove 4, and the gap between the pressing blade surface 81 and the front pressing surface 31 of the blade is less than or equal to 0.01 mm; after pressing, the gap between the pressing blade surface 81 and the front pressing surface 31 of the blade is 0 mm. In this embodiment, the pressing plate 8 includes a pressing blade surface 81, the pressing plate 8 and the cutter body 1 are integrated, the pressing blade surface 81 is the front positioning surface 41 of the blade groove 4, when not pressed, the gap between the pressing blade surface 81 and the front pressing surface 31 of the blade 3 is smaller than or equal to 0.01mm, when not pressed, a small gap is formed between the pressing blade surface 81 and the front pressing surface 31 of the blade 3, so that the blade is easy to mount, but when the gap is controlled within 0.01mm, the elastic deformation of the pressing plate 8 can be ensured, and the dimensional accuracy of the broach forming groove width W is not affected after the pressing plate 8 presses the blade 3.

Example 3

Based on the above embodiment 2, as shown in fig. 6 to 7, the dihedral angle α between the pressing blade face 81 and the front pressing face 31 of the blade 3 is 1 ° or less; after the pressing, the included angle between the dihedral angle of the pressing blade surface 81 and the front pressing surface 31 of the blade is 0. In this embodiment, when the blade is not pressed, the included angle α between the pressing blade surface 81 and the front pressing surface 31 of the blade 3 is smaller than or equal to 1 °, and as the tapered screw 2 is screwed, the pressing plate 8 is forced to elastically deform, the included angle α between the pressing blade surface 81 and the front pressing surface 31 of the blade 3 gradually decreases, and when the blade 3 is pressed, α tends to 0 °, as shown in fig. 7, thereby achieving the fastening and installation of the pressing plate to the blade 3.

Example 4

Based on the above embodiment 3, as shown in fig. 6 to 7, the included angle of the stressed conical surface 7 is 2 to 3 degrees smaller than the included angle of the top conical surface of the conical screw 2; after the compression, the included angle of the stress conical surface 7 is equal to the included angle of the top conical surface of the conical screw 2. In the invention, the pressing plate 8 comprises two pressing surfaces, one of which is a screw pressing plate surface 82, the screw pressing plate surface 82 is a part of the stress conical surface 7, and the included angle of the top conical surface of the conical screw 2 is theta, when the pressing plate is not pressed, in the embodiment, the included angle of the corresponding stress conical surface 7 is 2-3 degrees smaller than the included angle of the top conical surface of the conical screw 2, as shown in fig. 6; therefore, when the conical screw 2 is screwed down, the stress conical surface 7 is gradually increased in the pressing process, after the blade 3 is pressed, the included angle of the stress conical surface 7 tends to theta, and the screw pressing plate surface 82 is a part of the stress conical surface 7, so that the conical screw presses the upper pressing plate 8 of the conical screw 2 until the blade 3 is pressed, and the pressing plate 8 is elastically deformed, as shown in fig. 7. In addition, according to embodiment 3, the pressing plate 8 further includes another surface that is a pressing blade surface, and in order to press the blade surface 81, when the pressing blade surface 81 is not pressed, an included angle α between the pressing blade surface 81 and the front pressing surface 31 of the blade 3 is smaller than or equal to 1 °, as shown in fig. 6, and as the angle α between the pressing blade surface 81 and the blade pressing surface 31 is gradually reduced during the tightening of the conical screw 2, α tends to be 0 ° during the pressing of the blade 3, as shown in fig. 7. Through the angle setting of these two pressing surfaces on the clamp plate 8, make corresponding pressing surface increase, compress tightly more reliably, compress tightly the blade precision higher.

Example 5

Based on any one of the above embodiments 1-4, as shown in fig. 8, the vertical distance from the force bearing point of the conical screw 2 and the pressure plate 8 to the center of the stress slot 5 is H1, and the vertical distance from the force bearing point of the conical screw 2 and the pressure plate 8 to the force bearing point of the pressure plate 8 and the blade 3 is H2; the value of H1/H2 is 1.5 or more. In the embodiment, the structural size of the stress groove 5 is specifically stated, and the vertical distance from the stress point of the conical screw 2 and the pressure plate 8 to the center of the stress groove 5 is H1, the vertical distance from the stress point of the conical screw 2 and the pressure plate 8 to the stress point of the pressure plate 8 and the blade 3 is H2, and the value of H1/H2 is defined to be greater than or equal to 1.5. In the invention, the pressing plate 8 for pressing the blade is integrated with the cutter body 1, the pressing force F1 is applied to the pressing plate 8 through the conical screw 2, the pressing plate 8 generates elastic deformation, and the pressing force F2 is applied to the blade 3, thereby achieving the purpose of pressing the blade 3. In order to make the pressing plate 8 elastically deformed little, but the pressing force F2 is enough to press the blade 3, the structural size H1/H2 of the stress groove 5 in FIG. 3 should be not less than 1.5, if the value H1/H2 is too small, the value of F1 needs to be increased and the deformation amount of the pressing plate 8 needs to meet the requirement of the size F2, so that the threads in the pressing plate 8 and the screw hole 6 are easily damaged.

Example 6

Based on the above example 5, as shown in fig. 8, the minimum thickness L1 of the pressing plate 8 is 3-4 mm. In the present embodiment, a minimum thickness of the pressure plate 8 of 3-4mm is defined, and the minimum thickness of the pressure plate 8 can be seen as a horizontal distance from a tangent line of the stress groove 5 to a plane of the pressure plate 8; due to the limitation of the space size of the cutter body 1, L1 cannot be set to be too large, and L1 has a direct influence on the pressing force F1, when L1 is larger than 4mm, the F1 of the conical screw 2 pressing the pressing plate 8 is increased, and in order to obtain large F1, the friction force of the conical screw 2 and the thread on the cutter body 1 needs to be increased, so that the thread is easily damaged, or the cutter blade 3 cannot be pressed tightly. If L1 is less than 3mm, the pressing plate 8 is easily broken, and the service life of the cutter body 1 is reduced.

Example 7

Based on the above examples 1-4 or 6, the length of the blade body 1 was 300 mm. In the present embodiment, the length of the cutter body 1 is illustrated as 300mm, but the present invention is not limited to the above-mentioned dimensions, and the length of the cutter body 1 may be set according to actual needs.

Example 8

Based on the above embodiment 1, as shown in fig. 1 and 3, 10 insert pockets 4 are sequentially arranged on the cutter body 1 from left to right at different spatial positions as required, and one insert 3 is installed in any one insert pocket 4. In the present embodiment, the number of the insert pockets 4 on the cutter body 1 is explained, and 10 insert pockets 4 may be uniformly arranged on the cutter body 1 from left to right based on the length of the cutter body 1 in embodiment 7, but the number of the insert pockets 4 is not limited to the above-mentioned number of the insert pockets 4, and the number of the insert pockets 4 may be arranged according to actual conditions.

Example 9

Based on the above embodiment 7, the insert 3 is made of cemented carbide. In the present embodiment, the description is given of the cutting of the blade 3 made of cemented carbide, which can machine a material such as a nodular cast iron workpiece and a high temperature alloy workpiece.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.