阅读说明：本技术 一种燃气轮机用后轴颈喷丸方法 (Rear journal shot blasting method for gas turbine ) 是由 高硕� 任大为 李洋 祁一东 刘澎涛 陶林 王鑫 赵强 邢丽丹 杨成 于 2020-12-22 设计创作，主要内容包括：本发明的目的在于提供一种燃气轮机用后轴颈喷丸方法,本发明采用分段喷丸和二次装夹保护,即通过第一次装夹—喷丸—第二次装夹—喷丸的方式,最优化的进行了喷枪与保护装置的更换,既提高了工作效率,又降低了成本。喷丸过程中的后轴颈装夹保护装置提供一种稳定可靠的支撑,其中通过改变弹性支撑环的大小可满足规格接近的后轴颈的喷丸要求,可进一步地降低成本。通过对后轴颈进行喷丸处理,达到提高后轴颈疲劳寿命的目的,最终有利于提高了整个燃机机组可靠性和耐久性。(The invention aims to provide a shot blasting method for a rear journal of a gas turbine, which adopts segmented shot blasting and secondary clamping protection, namely, the replacement of a spray gun and a protection device is optimally carried out in a mode of primary clamping, shot blasting, secondary clamping and shot blasting, so that the working efficiency is improved, and the cost is reduced. The rear shaft neck clamping protection device in the shot blasting process provides a stable and reliable support, wherein the shot blasting requirement of the rear shaft neck with the close specification can be met by changing the size of the elastic support ring, and the cost can be further reduced. The aim of prolonging the fatigue life of the rear shaft neck is achieved by carrying out shot blasting treatment on the rear shaft neck, and finally the improvement of the reliability and the durability of the whole gas turbine unit is facilitated.)

1. A rear shaft neck shot blasting method for a gas turbine is characterized by comprising the following steps:

(1) clamping for the first time: hoisting a small end clamping protection device onto an equipment rotary table by using a lifting lug, wherein the small end clamping protection device comprises a base and a supporting plate, a U-shaped groove A is formed in the base, the base is fixed on the equipment rotary table through the U-shaped groove A, the supporting plate is installed on the base through a supporting rod, a hollow elastic pad is arranged between a rear shaft neck and the supporting plate, a limiting column is attached to the inner wall of the large end of the rear shaft neck and fixed on the supporting plate, the lifting lug is arranged on the supporting plate, and after the small end clamping protection device is hoisted onto the equipment rotary table, the lifting lug is removed and the elastic pad is attached to the supporting; the small end of the rear shaft neck is upwards hung on the small end clamping protection device;

(2) shot blasting on the outer surface of the small end of the rear journal: after the threads and the sealing teeth are protected by an adhesive tape, shot blasting is carried out on the outer surface of the rear shaft neck, except the threads and the sealing teeth, from the small end to the large end from top to bottom by using a common spray gun, the rotation of parts is kept in the shot blasting process, and then a rotary spray gun is installed;

(3) shot blasting on the inner surface of the small end of the rear journal: rotating the spray gun, keeping the rear shaft neck still, performing shot blasting treatment on the inner surface of the long straight opening at the small head end of the rear shaft neck by using the rotary spray gun, disassembling the rear shaft neck, disassembling the small head end clamping protection device, and keeping the rotary spray gun;

(4) and (3) clamping for the second time: the large head end clamping protection device is placed on an equipment rotary table and comprises a base plate, a middle plate and an upper plate, wherein a U-shaped groove B is formed in the base plate, the base plate is fixed on the equipment rotary table through the U-shaped groove B, a lower stand column is installed between the middle plate and the base plate, the upper stand column is installed between the upper plate and the middle plate, an elastic lining ring is sleeved outside a rear shaft neck, the upper plate is fixed through the elastic lining ring through a connecting bolt, a limiting bolt is arranged on the upper stand column, the end part of the limiting bolt is attached to the outer wall of the small end of the rear shaft neck, an elastic support ring is arranged at the end part of the small end of the rear shaft neck, the middle plate is fixed with the elastic support ring through; the small end of the rear shaft neck is downwards hung on the large end clamping protection device;

(5) shot blasting on the inner surface of the big head end of the rear journal: after the threads and the sealing teeth are protected by the adhesive tape, shot blasting treatment is carried out on the inner surface of the long straight opening at the large head end of the rear shaft neck by using a rotary spray gun, the parts are kept static and the rotary spray gun rotates in the shot blasting process, and after the shot blasting is finished, the rotary spray gun is disassembled and a common spray gun is prepared for standby application;

(6) shot blasting on the outer surface of the large head end of the rear shaft neck: carrying out shot blasting treatment on the outer surface of the rear journal, except for the threads and the sealing teeth, from the big end to the long straight opening from top to bottom by using a common spray gun, and keeping the rear journal to rotate in the shot blasting process;

(7) shot blasting post-treatment: after the parts are processed to be qualified, the parts are disassembled; and (3) cleaning the surface of the component by adopting blowing, solvent cleaning or ultrasonic wave, disassembling the protection device for standby, and cleaning equipment and the site.

2. The method of claim 1, wherein the post journal peening is performed by: the common spray gun comprises a straight spray gun, a 45-degree elbow spray gun and a 90-degree elbow spray gun, the rotating speed R of the rotating spray gun in the step (3) is 5-20R/min, and the length of the rotating spray gun is at least greater than half of the length of the long straight inner hole.

3. The method for post-journal shot peening of a gas turbine as set forth in claim 1 or 2, wherein: and (5) the rotating speed T of the rotating spray gun is 30-100 r/min.

Technical Field

The invention relates to a clamping shot blasting method, in particular to a clamping shot blasting method of a gas turbine.

Background

The gas turbine rear journal belongs to the rotor part. The back shaft neck belongs to the back end part of the gas turbine compressor, is used for supporting, driving and sealing the gas compressor, has harsh and complicated working environment and is mostly manufactured by high-temperature alloy.

The local stress and mechanical vibration generated by the uneven stress of the rear journal in the rotating process are the main reasons of crack initiation and early propagation. The shot peening can introduce a residual compressive stress field, favorably change the microstructure, and remarkably prolong the fatigue life of the rear journal, thereby effectively improving the reliability and durability of the whole combustion engine unit.

The rear journal of the gas turbine with a complex structure has the characteristics that the small end has a larger length diameter, and the large end section is in a bell mouth, and the rear journal needs to carry out comprehensive shot blasting treatment on the inner surface and the outer surface except threads and sealing teeth. Particularly, when the inner surface is machined, the rotary shot blasting length does not meet the requirement of the length of the rear shaft neck, and shot blasting cannot be completed at one time, so that segmented shot blasting and segmented clamping protection are required in the shot blasting process of the rear shaft neck.

Disclosure of Invention

The invention aims to provide a shot blasting method for a rear journal of a gas turbine, which solves the problems that the rear journal of the gas turbine with a complex structure carries out overall shot blasting on the inner surface and the outer surface except threads and sealing teeth and the like.

The purpose of the invention is realized as follows:

the invention relates to a shot blasting method for a rear journal of a gas turbine, which is characterized by comprising the following steps of:

(1) clamping for the first time: hoisting a small end clamping protection device onto an equipment rotary table by using a lifting lug, wherein the small end clamping protection device comprises a base and a supporting plate, a U-shaped groove A is formed in the base, the base is fixed on the equipment rotary table through the U-shaped groove A, the supporting plate is installed on the base through a supporting rod, a hollow elastic pad is arranged between a rear shaft neck and the supporting plate, a limiting column is attached to the inner wall of the large end of the rear shaft neck and fixed on the supporting plate, the lifting lug is arranged on the supporting plate, and after the small end clamping protection device is hoisted onto the equipment rotary table, the lifting lug is removed and the elastic pad is attached to the supporting; the small end of the rear shaft neck is upwards hung on the small end clamping protection device;

(2) shot blasting on the outer surface of the small end of the rear journal: after the threads and the sealing teeth are protected by an adhesive tape, shot blasting is carried out on the outer surface of the rear shaft neck, except the threads and the sealing teeth, from the small end to the large end from top to bottom by using a common spray gun, the rotation of parts is kept in the shot blasting process, and then a rotary spray gun is installed;

(3) shot blasting on the inner surface of the small end of the rear journal: rotating the spray gun, keeping the rear shaft neck still, performing shot blasting treatment on the inner surface of the long straight opening at the small head end of the rear shaft neck by using the rotary spray gun, disassembling the rear shaft neck, disassembling the small head end clamping protection device, and keeping the rotary spray gun;

(4) and (3) clamping for the second time: the large head end clamping protection device is placed on an equipment rotary table and comprises a base plate, a middle plate and an upper plate, wherein a U-shaped groove B is formed in the base plate, the base plate is fixed on the equipment rotary table through the U-shaped groove B, a lower stand column is installed between the middle plate and the base plate, the upper stand column is installed between the upper plate and the middle plate, an elastic lining ring is sleeved outside a rear shaft neck, the upper plate is fixed through the elastic lining ring through a connecting bolt, a limiting bolt is arranged on the upper stand column, the end part of the limiting bolt is attached to the outer wall of the small end of the rear shaft neck, an elastic support ring is arranged at the end part of the small end of the rear shaft neck, the middle plate is fixed with the elastic support ring through; the small end of the rear shaft neck is downwards hung on the large end clamping protection device;

(5) shot blasting on the inner surface of the big head end of the rear journal: after the threads and the sealing teeth are protected by the adhesive tape, shot blasting treatment is carried out on the inner surface of the long straight opening at the large head end of the rear shaft neck by using a rotary spray gun, the parts are kept static and the rotary spray gun rotates in the shot blasting process, and after the shot blasting is finished, the rotary spray gun is disassembled and a common spray gun is prepared for standby application;

(6) shot blasting on the outer surface of the large head end of the rear shaft neck: carrying out shot blasting treatment on the outer surface of the rear journal, except for the threads and the sealing teeth, from the big end to the long straight opening from top to bottom by using a common spray gun, and keeping the rear journal to rotate in the shot blasting process;

(7) shot blasting post-treatment: after the parts are processed to be qualified, the parts are disassembled; and (3) cleaning the surface of the component by adopting blowing, solvent cleaning or ultrasonic wave, disassembling the protection device for standby, and cleaning equipment and the site.

The present invention may further comprise:

1. the common spray gun comprises a straight spray gun, a 45-degree elbow spray gun and a 90-degree elbow spray gun, the rotating speed R of the rotating spray gun in the step (3) is 5-20R/min, and the length of the rotating spray gun is at least greater than half of the length of the long straight inner hole.

2. And (5) the rotating speed T of the rotating spray gun is 30-100 r/min.

The invention has the advantages that:

1. the invention provides a shot blasting solution and a shot blasting clamping scheme for the rear journal of the gas turbine with a complex structure. The requirement that the rear journal with the characteristics of large length-diameter ratio of the small end and bell mouth of the large end section needs to carry out comprehensive shot blasting treatment on the inner surface and the outer surface except for threads and sealing teeth is met, the aim of prolonging the fatigue life of the rear journal is fulfilled, and the reliability and the durability of the whole gas turbine unit are improved.

2. The invention adopts segmented shot blasting and secondary clamping protection, optimally replaces the spray gun and the protection device, improves the working efficiency and reduces the cost.

3. The rear shaft neck clamping and protecting device in the shot blasting process provides a stable and reliable support, wherein the shot blasting requirement of rear shaft necks with similar specifications can be met by changing the size of the elastic support ring, and the cost can be further reduced.

Drawings

FIG. 1 is a flow chart of the present invention;

FIG. 2 is a schematic structural view of the small end clamping protection device of the present invention;

FIG. 3 is a top view of the small end clamp protector;

FIG. 4 is a schematic structural view of the large head end clamping protection device of the present invention;

FIG. 5 is a top view of the large end clamp protection device.

Detailed Description

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

with reference to fig. 1-5, the method of the present invention is completed by a first clamping-shot blasting-second clamping-shot blasting method, and the method comprises the following steps:

the method comprises the following steps: clamping for the first time;

referring to fig. 1 and 2, the small end clamping protection device used in the present invention includes a limiting column 2, a lifting lug 3, an elastic pad 4, a bolt 5, a base 6, a support rod 7, a support disk 8, a U-shaped groove a9, etc., which together form the small end clamping protection device. The clamping protection device is hoisted to the equipment rotary table by using the lifting lugs 3, and the U-shaped groove A9 and the equipment rotary table are fixed through bolts. And (4) removing the lifting lug 3 and attaching the elastic pad 4 to the supporting disk 8. And (4) lifting the small end of the rear shaft neck upwards on the clamping protection device at the small end.

Step two: shot blasting is carried out on the outer surface of the small end;

after the threads and the sealing teeth are protected by the adhesive tape, the parts are kept rotating in the shot blasting process, and shot blasting treatment is carried out on the outer surface of the rear shaft neck, except the threads and the sealing teeth, from the small end to the large end from top to bottom by using a common spray gun. And after the processing is qualified, installing a rotary spray gun.

Step three: shot blasting on the inner surface of the small end;

and in the shot blasting process, keeping the parts relatively static, rotating the spray gun, and performing shot blasting treatment on the inner surface of the long straight port at the small end of the rear shaft neck by using the rotating spray gun. And after the part is processed to be qualified, the part is disassembled, the small head end is disassembled to clamp the protection device, and the rotary spray gun is reserved.

Step four: clamping for the second time;

referring to fig. 3 and 4, the clamping protection device for the large head end used in the invention comprises an elastic inner lining ring 10, an upper disc 11, a limiting bolt 12, an upper upright post 13, a middle disc 14, a lower upright post 15, a bottom disc 16, an elastic support ring 17, a fixing bolt 18, a connecting bolt 19, a U-shaped groove B20, an ear hanging hole 21 and the like, which jointly form the clamping protection device for the large head end. And placing the combined device on an equipment rotary table. The U-shaped groove B20 is fixed with the equipment rotary table through bolts. And (4) downwards hanging the small end of the rear shaft neck on a clamping protection device with a large end.

Step five: shot blasting on the inner surface of the large head end;

after the threads and the seal teeth are protected by the adhesive tape, the parts are kept relatively static and the spray gun rotates in the shot blasting process. And (3) carrying out shot blasting treatment on the inner surface of the long straight opening at the large head end of the rear shaft neck by using a rotary spray gun. And further, after the machining is qualified, the rotary spray gun is disassembled, and a common spray gun is prepared for standby.

Step six: shot blasting is carried out on the outer surface of the big head end;

the parts are kept rotating in the shot blasting process, and shot blasting treatment is carried out on the outer surface of the rear shaft neck, except for the threads and the sealing teeth, from the big end to the long straight opening from top to bottom by using a common spray gun.

Step seven: post-processing by shot blasting;

and after the parts are processed to be qualified, the parts are disassembled. And (4) cleaning the surface of the component by adopting blowing, solvent cleaning or ultrasonic wave. And (5) disassembling the protection device for standby, and cleaning equipment and the site.

In the first step, the distance between the lower surface of the base and the upper surface of the supporting disc is D, and D is more than or equal to 200 mm. The shot blasting equipment is prevented from being limited in stroke.

The common spray guns in the step two comprise straight spray guns, 45-degree elbow spray guns and 90-degree elbow spray guns. The rotation speed R is preferably 5 to 20R/min. The length of the rotary spray gun is at least more than half of the length of the long straight inner hole.

The rotating speed T of the rotating spray gun in the third step is recommended to be 30-100 r/min.

In the fourth step, the elastic pad 4, the elastic lining ring 10 and the elastic support ring 17 are made of elastic polymer materials, such as nylon, polytetrafluoroethylene and rubber. The limiting bolt is made of nylon, polytetrafluoroethylene and the like. Except the elastic cushion 4, the elastic lining ring 10, the limiting bolt 12, the elastic supporting ring 17 and other components, economical steel materials such as No. Q235 and No. 45 steel plates are selected.

The working principle is as follows: shot peening can introduce a residual compressive stress field and cause the surface of the component to generate elastic-plastic deformation, and finally the reliability and the durability of the rear axle neck are improved. The gas turbine rear journal with a complex structure has the characteristics that the small end has a larger long diameter, and the large end section is in a bell mouth shape. The shot blasting treatment of the rear journal with a complex structure is completed by the modes of primary clamping, shot blasting, secondary clamping and shot blasting, and the purpose of improving the reliability and durability of the rear journal is achieved.

The embodiment is a surface strengthening method of a rear axle journal, which comprises the following specific steps:

step 1: the rear journal surface was wiped with acetone and air dried prior to this example.

Step 2: the rear shaft neck is processed by adopting GH4169 material, the shot blasting strength is required to meet 0.25N-0.40 Nmm, and the surface coverage rate is more than or equal to 100%.

And step 3: in the embodiment, after the shot blasting strength of the test piece is verified to meet the process requirements, the shot blasting treatment of the part is completed through sectional clamping and sectional shot blasting.

And 4, step 4: in this embodiment, the length of the long straight opening is about 520mm, and a rotary spray gun with a length of 350mm is selected.

And 5: after this example, the journal surface was purged or cleaned after passing inspection.

Step 6: after this example, the rear journal was stored for assembly without any machining and heat treatment.