阅读说明：本技术 一种汽轮机高中压转子调节级安装孔加工定位装置及方法 (Device and method for machining and positioning mounting hole of high-medium pressure rotor regulating stage of steam turbine ) 是由 孟阳 张红星 王志臣 高岩 梁小丹 马天宇 吕吉宝 常海滨 胡金龙 于 2020-06-24 设计创作，主要内容包括：一种汽轮机高中压转子调节级安装孔加工定位装置及方法,它涉及汽轮机高中压转子技术领域。本发明解决了现有的汽轮机高中压转子调节级安装孔加工方法存在由于转子叶轮设计结构的原因,没有足够的加工空间完成钻孔的问题。本发明的汽轮机高中压转子调节级安装孔加工方法是通过以下步骤实现的,步骤一、在转子的叉式叶轮两侧待加工安装孔处划线；步骤二、采用汽轮机高中压转子调节级安装孔加工定位装置对叶片和转子进行定位；步骤三、铣孔加工；步骤四、预钻加工；步骤五、扩孔加工。本发明用于准确加工工业汽轮机高中压转子调节级安装孔。(A device and a method for machining and positioning a mounting hole of a regulating stage of a high-and-medium-pressure rotor of a steam turbine relate to the technical field of high-and-medium-pressure rotors of steam turbines. The invention solves the problem that the existing method for processing the mounting hole of the high-medium pressure rotor regulating stage of the steam turbine has insufficient processing space to complete drilling due to the design structure of the rotor impeller. The method for processing the mounting holes of the regulating stage of the high-medium pressure rotor of the steam turbine is realized by the following steps of firstly, marking lines at the mounting holes to be processed on the two sides of a fork-type impeller of the rotor; step two, positioning the blade and the rotor by adopting a positioning device for machining a mounting hole of a regulating stage of the high-medium pressure rotor of the steam turbine; step three, milling holes; step four, pre-drilling; and step five, reaming. The invention is used for accurately processing the mounting hole of the high-medium pressure rotor regulating stage of the industrial steam turbine.)

1. The utility model provides a steam turbine high-and-medium pressure rotor regulating stage mounting hole processing positioner which characterized in that: the drilling tool comprises a positioning frame (1), an upper puller bolt (4), three pairs of drill bushings (2) and three side puller bolts (3), wherein the positioning frame (1) comprises a left positioning plate (1-1), an upper positioning plate (1-2) and a right positioning plate (1-3), the left positioning plate (1-1), the upper positioning plate (1-2) and the right positioning plate (1-3) are all of rectangular plate-shaped structures, the upper positioning plate (1-2) is horizontally arranged, the left positioning plate (1-1) and the right positioning plate (1-3) are respectively vertically arranged on the left side and the right side of the upper positioning plate (1-2), the left positioning plate (1-1), the upper positioning plate (1-2) and the right positioning plate (1-3) form a half I-shaped integrated structure, a first positioning hole (1-1-1) is processed on the left positioning plate (1-1), three first threaded through holes (1-1-2) are machined below and on the left side and the right side of a first positioning hole (1-1-1), three side jacking bolts (3) are respectively and spirally installed in the three first threaded through holes (1-1-2), a second positioning hole (1-3-1) is machined on a right positioning plate (1-3), the first positioning hole (1-1-1) and the second positioning hole (1-3-1) are concentric and have the same aperture, a second threaded through hole is formed in the center of the upper end face of an upper positioning plate (1-2) in the vertical direction, an upper jacking bolt (4) is installed in the second threaded through hole of the upper positioning plate (1-2), a drill sleeve (2) is a positioning sleeve with a boss and used for machining a drill hole along the central line, and the size of the excircle of the drill sleeve (2) is as that of the first positioning hole (1-1-1) and the second positioning hole (1-3-1) ruler The size of the drill bush is tightly matched, the three pairs of drill bushes (2) comprise two first positioning bushes, two second positioning bushes and two third positioning bushes, the drilling diameter of each first positioning bush is 10mm, the drilling diameter of each second positioning bush is 17.7mm, the drilling diameter of each third positioning bush is 18mm, and the drill bushes (2) are made of copper.

2. A method for machining the mounting hole of the regulating stage of the high-and-medium-pressure rotor of the steam turbine by using the positioning device for machining the mounting hole of the regulating stage of the high-and-medium-pressure rotor of the steam turbine according to claim 1, which is characterized by comprising the following steps of: the method for processing the mounting hole of the regulating stage of the high-and medium-pressure rotor of the steam turbine is realized by the following steps,

step one, scribing:

marking lines at mounting holes to be processed on two sides of a fork type impeller of the rotor (6);

step two, positioning the blade (5) and the rotor (6) by adopting a positioning device for machining a mounting hole of a regulating stage of the high-medium pressure rotor of the steam turbine:

the forked blade root of the blade (5) is inserted on the forked impeller of the rotor (6), the forked blade root of the blade (5) and the forked impeller of the rotor (6) are in micro interference fit, a groove of the positioning frame (1) is buckled on the forked impeller of the rotor (6), the left positioning plate (1-1) is arranged on the end face side of the rotary hole, the position of the first positioning hole (1-1-1) is determined according to the marking position on one side of the forked impeller of the rotor (6) in the first step, the three side jacking bolts (3) are screwed into the three first thread through holes (1-1-2) of the left positioning plate (1-1) and penetrate through the left positioning plate (1-1), the three side jacking bolts (3) jack up the end face side of the forked impeller of the rotor (6), so that the inner side of the right positioning plate (1-3) is tightly matched with the other end face of the forked impeller of the rotor (6), screwing the upper puller bolt (4) into the second threaded through hole of the upper positioning plate (1-2) and penetrating through the upper positioning plate (1-2), and tightly jacking the blade crown of the blade (5) by the upper puller bolt (4);

step three, hole milling processing:

respectively installing the two first positioning sleeves into a first positioning hole (1-1-1) of the left positioning plate (1-1) and a second positioning hole (1-3-1) of the right positioning plate (1-3), connecting a keyway milling cutter with a machine tool by using a conversion cutter sleeve, drilling a hole from the first positioning sleeve in the first positioning hole (1-1-1) by using the keyway milling cutter, and milling the positioning hole; then, the operation is repeated from a first positioning sleeve of a second positioning hole (1-3-1) of a right positioning plate (1-3) on the other side of the fork-type impeller of the rotor (6), and a positioning hole is milled, wherein the effective depth of the positioning hole is more than or equal to 20 mm;

step four, pre-drilling:

then taking down the key slot milling cutter in the third step, connecting a drill bit with a machine tool, drilling a hole from the first positioning sleeve by using the drill bit, performing pre-drilling processing on the positioning hole, repeating the operation from the second positioning hole (1-3-1) of the right positioning plate (1-3) on the other side of the fork impeller of the rotor (6), and pre-drilling a through hole;

step five, reaming:

respectively installing two second positioning sleeves into a second positioning hole (1-3-1) of a right positioning plate (1-3) and a first positioning hole (1-1-1) of a left positioning plate (1-1), firstly connecting a drill bit with a machine tool, drilling a hole from the second positioning sleeve by using the drill bit, carrying out reaming processing on the positioning hole, wherein the margin on one side is 0.15mm, then repeating the operation from the first positioning hole (1-1-1) of the left positioning plate (1-1) on the other side of a fork impeller of a rotor (6), and carrying out reaming processing on a through hole by using a reaming machine, wherein the margin on one side is 0.15 mm;

step six, reaming:

and (3) respectively installing the two third positioning sleeves into a first positioning hole (1-1-1) of the left positioning plate (1-1) and a second positioning hole (1-3-1) of the right positioning plate (1-3), firstly connecting the reamer with a machine tool, drilling a hole from the third positioning sleeve by using the reamer, reaming the positioning holes, then repeating the operation from the second positioning hole (1-3-1) of the right positioning plate (1-3) on the other side of the fork impeller of the rotor (6), and reaming a through hole, thus finishing the machining of the assembling hole of the workpiece.

3. The method for machining the mounting hole of the regulating stage of the high-and medium-pressure rotor of the steam turbine according to claim 2, wherein the method comprises the following steps: the length of the key slot milling cutter in the third step is 50mm, and the depth of the positioning hole processed by the milling hole in the third step is 20 mm.

4. The method for machining the mounting hole of the regulating stage of the high-and medium-pressure rotor of the steam turbine according to claim 3, wherein the method comprises the following steps of: the diameter of the drill hole of the first positioning sleeve in the fourth step is 10mm, the length of the drill bit in the fourth step is 100mm, and the diameter of the drill bit is 10 mm.

5. The method for machining the mounting hole of the regulating stage of the high-and medium-pressure rotor of the steam turbine according to claim 4, wherein the method comprises the following steps of: the depth of the positioning hole pre-drilled in the fourth step is 80mm, the diameter of the positioning hole pre-drilled in the fourth step is 10mm, and the diameter of the through hole pre-drilled in the fourth step is 10 mm.

6. The method for machining the mounting hole of the regulating stage of the high-and medium-pressure rotor of the steam turbine according to claim 5, wherein the method comprises the following steps of: the diameter of the drill hole of the second positioning sleeve in the fifth step is 17.7mm, the length of the drill bit in the fifth step is 100mm, and the diameter of the drill bit is 17.7 mm.

7. The method for machining the mounting hole of the regulating stage of the high-and medium-pressure rotor of the steam turbine according to claim 6, wherein the method comprises the following steps of: and fifthly, the depth of the positioning hole subjected to reaming is 80mm, the diameter of the positioning hole subjected to reaming is 17.7mm, and the diameter of the through hole subjected to reaming in the fifth step is 17.7 mm.

8. The method for machining the mounting hole of the regulating stage of the high-and medium-pressure rotor of the steam turbine according to claim 7, wherein the method comprises the following steps of: the reaming diameter of the third positioning sleeve in the sixth step is 18mm, the length of the reamer in the sixth step is 100mm, and the diameter of the reamer in the sixth step is 18 mm.

9. The method for machining the mounting hole of the regulating stage of the high-and medium-pressure rotor of the steam turbine according to claim 8, wherein the method comprises the following steps: the depth of the positioning hole subjected to reaming in the sixth step is 80mm, the diameter of the positioning hole subjected to reaming is 18mm, and the diameter of the through hole subjected to reaming in the sixth step is 18 mm.

Technical Field

The invention relates to the technical field of high and medium pressure rotors of steam turbines, in particular to a device and a method for machining and positioning mounting holes of regulating stages of the high and medium pressure rotors of the steam turbines.

Background

The utility model provides an installation of industry steam turbine high and medium pressure rotor regulation level impeller is connected through a plurality of phi 18mm through-holes at the circumference distribution, and this through-hole degree of depth is about 150mm, because rotor structure is special, this hole impeller closes on both sides distance 230mm and also has the impeller structure about, because the impeller is adjacent very near, will 150mm from one side drilling bit and roll over the cutting board 120mm to the drilling machine in addition, whole thickness will 270mm, drilling operating space is not enough. Therefore, the device and the method for machining and positioning the mounting hole of the high-medium pressure rotor regulating stage of the steam turbine are provided.

In summary, the existing method for machining the mounting hole of the high-medium pressure rotor regulating stage of the steam turbine has the problem that due to the design structure of the rotor impeller, a sufficient machining space is not available for completing drilling.

Disclosure of Invention

The invention aims to solve the problem that due to the design structure of a rotor impeller, an insufficient machining space is not available to complete drilling in the existing machining method for the mounting hole of the high-and-medium-pressure rotor regulating stage of the steam turbine, and further provides a positioning device and a positioning method for machining the mounting hole of the high-and-medium-pressure rotor regulating stage of the steam turbine.

The technical scheme of the invention is as follows:

a steam turbine high-and-medium-pressure rotor regulating stage mounting hole machining and positioning device comprises a positioning frame 1, an upper tightening bolt 4, three pairs of drill bushings 2 and three side tightening bolts 3, wherein the positioning frame 1 comprises a left positioning plate 1-1, an upper positioning plate 1-2 and a right positioning plate 1-3, the left positioning plate 1-1, the upper positioning plate 1-2 and the right positioning plate 1-3 are all rectangular plate-shaped structures, the upper positioning plate 1-2 is horizontally arranged, the left positioning plate 1-1 and the right positioning plate 1-3 are respectively vertically arranged on the left side and the right side of the upper positioning plate 1-2, the left positioning plate 1-1, the upper positioning plate 1-2 and the right positioning plate 1-3 form a half I-shaped integrated structure, a first positioning hole 1-1-1 is machined in the left positioning plate 1-1, and three first threaded through holes 1-1 are machined in the left side and the right side and the left side of the first positioning hole 1-1-2, three side tightening bolts 3 are respectively and spirally installed in three first threaded through holes 1-1-2, a second positioning hole 1-3-1 is processed on a right positioning plate 1-3, the first positioning hole 1-1 and the second positioning hole 1-3-1 are concentric and have the same aperture, the second threaded through hole is formed in the center of the upper end face of the upper positioning plate 1-2 along the vertical direction, an upper tightening bolt 4 is installed in the second threaded through hole of the upper positioning plate 1-2, a drill sleeve 2 is a positioning sleeve with a boss and used for drilling along the central line, the size of the outer circle of the drill sleeve 2 is closely matched with the size of the inner holes of the first positioning hole 1-1 and the second positioning hole 1-3-1, and three pairs of drill sleeves 2 comprise two first positioning sleeves, two second positioning sleeves and two third positioning sleeves, the diameter of a drill hole of the first positioning sleeve is 10mm, the diameter of a drill hole of the second positioning sleeve is 17.7mm, the diameter of a drill hole of the third positioning sleeve is 18mm, and the drill sleeve 2 is made of copper.

A method for processing a mounting hole of a regulating stage of a high-and-medium-pressure rotor of a steam turbine by adopting a positioning device for processing the mounting hole of the regulating stage of the high-and-medium-pressure rotor of the steam turbine is realized by the following steps,

step one, scribing:

marking lines at mounting holes to be processed on two sides of a fork type impeller of the rotor 6;

step two, positioning the blade 5 and the rotor 6 by adopting a positioning device for machining a mounting hole of a regulating stage of the steam turbine high-medium pressure rotor:

the forked blade root of the blade 5 is inserted on the forked impeller of the rotor 6, the forked blade root of the blade 5 and the forked impeller of the rotor 6 are in slight interference fit, a groove of a positioning frame 1 is buckled on the forked impeller of the rotor 6, a left positioning plate 1-1 is arranged on the side of the end face of a rotating hole, the position of a first positioning hole 1-1-1 is positioned according to the marking position of one side of the forked impeller of the rotor 6 in the first step, three side jacking bolts 3 are screwed into three first thread through holes 1-1-2 of the left positioning plate 1-1 and penetrate through the left positioning plate 1-1, the three side jacking bolts 3 jack the side of the end face of the forked impeller of the rotor 6, the inner side of a right positioning plate 1-3 is tightly matched with the other end face of the forked impeller of the rotor 6, an upper jacking bolt 4 is screwed into a second thread through hole of the upper positioning plate 1-2 and penetrates, the upper puller bolt 4 jacks the blade crown of the blade 5;

step three, hole milling processing:

respectively installing the two first positioning sleeves into a first positioning hole 1-1-1 of the left positioning plate 1-1 and a second positioning hole 1-3-1 of the right positioning plate 1-3, connecting a keyway milling cutter with a machine tool by using a conversion cutter sleeve, drilling a hole from the first positioning sleeve in the first positioning hole 1-1-1 by using the keyway milling cutter, and milling the positioning hole; then, the operation is repeated from a first positioning sleeve of a second positioning hole 1-3-1 of a right positioning plate 1-3 on the other side of the fork-type impeller of the rotor 6, and a positioning hole is milled, wherein the effective depth of the positioning hole is more than or equal to 20 mm;

step four, pre-drilling:

then taking down the key slot milling cutter in the third step, connecting a drill bit with a machine tool, drilling a hole from the first positioning sleeve by using the drill bit, performing pre-drilling processing on the positioning hole, repeating the operation from a second positioning hole 1-3-1 of a right positioning plate 1-3 on the other side of a fork-type impeller of the rotor 6, and pre-drilling a through hole;

step five, reaming:

respectively installing two second positioning sleeves into a second positioning hole 1-3-1 of a right positioning plate 1-3 and a first positioning hole 1-1-1 of a left positioning plate 1-1, connecting a drill bit with a machine tool, drilling a hole from the second positioning sleeve by using the drill bit, carrying out hole expanding processing on the positioning hole, wherein the single-side margin is 0.15mm, and then repeating the operation from the first positioning hole 1-1-1 of the left positioning plate 1-1 on the other side of a fork impeller of a rotor 6 to expand and drill a through hole, wherein the single-side margin is 0.15 mm;

step six, reaming:

and (3) respectively installing the two third positioning sleeves into the first positioning hole 1-1-1 of the left positioning plate 1-1 and the second positioning hole 1-3-1 of the right positioning plate 1-3, connecting a reamer with a machine tool, drilling holes from the third positioning sleeves by using the reamer to perform reaming of the positioning holes, repeating the operation from the second positioning hole 1-3-1 of the right positioning plate 1-3 on the other side of the fork impeller of the rotor 6, and reaming a through hole, thereby finishing the machining of the assembling hole of the workpiece.

Compared with the prior art, the invention has the following effects:

1. the positioning device for machining the mounting hole of the regulating stage of the high-medium pressure rotor of the steam turbine can accurately position the blade and the rotor, the groove of the positioning frame is buckled on the fork-type impeller of the rotor, the blade and the rotor are positioned in the axial direction through the left positioning plate and the right positioning plate, the three side jacking bolts are screwed into the three first threaded through holes of the left positioning plate and penetrate through the left positioning plate, the three side jacking bolts jack the end surface side of the fork-type impeller of the rotor, and the inner side of the right positioning plate is tightly matched with the other end surface of the fork-type impeller of the rotor. According to the invention, the upper puller bolt is screwed into the second threaded through hole of the upper positioning plate and penetrates through the upper positioning plate, and the upper puller bolt jacks the blade shroud of the blade, so that the blade and the rotor are positioned in the radial direction. The technical problem of the industrial steam turbine high and medium pressure rotor regulating stage mounting hole in the machining process is solved, and the machining quality of the mounting hole is guaranteed. The positioning device for processing the mounting hole of the regulating stage of the high-medium pressure rotor of the steam turbine has the advantages of simple structure, easy production and manufacture, low cost and convenient popularization and use in a large range.

2. The method for processing the mounting hole of the regulating stage of the high-medium pressure rotor of the steam turbine adopts a part of hole depth on both sides of the through hole to complete the whole drilling process, and because the drilling machine does not have numerical control positioning, the drilling is carried out in the forward and reverse directions according to the marking position, the marking has deviation, and the positioning of the holes on both sides of the impeller is difficult. According to the method for processing the mounting hole of the regulating stage of the high-and-medium-pressure rotor of the steam turbine, the blade and the rotor can be accurately positioned by adopting the positioning device for processing the mounting hole of the regulating stage of the high-and-medium-pressure rotor of the steam turbine, the blade and the rotor are positioned in the axial direction by the left and right positioning plates and the tops of the three side jacking bolts, and the blade and the rotor are positioned in the radial direction by the upper jacking bolt.

Drawings

FIG. 1 is a front view of a turbine high and intermediate pressure rotor regulation stage mounting hole machining and positioning apparatus of the present invention;

FIG. 2 is a top view of the turbine high and intermediate pressure rotor regulation stage mounting hole machining and positioning apparatus of the present invention;

FIG. 3 is a left side view of the turbine high and intermediate pressure rotor regulation stage mounting hole machining and positioning apparatus of the present invention;

FIG. 4 is a cross-sectional view at A-A of FIG. 2;

FIG. 5 is an isometric view of the steam turbine high and medium pressure rotor regulating stage mounting hole machining and locating device of the present invention;

FIG. 6 is a schematic view of the working state of the positioning device for machining the mounting hole of the regulating stage of the high-and medium-pressure rotor of the steam turbine.

Detailed Description