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A Method for Determining the Special Grinding and Grinding Amount of the Rough Broach Used in Steam Turbine Groove Broaching

A determination method, steam turbine technology, applied in the direction of broaching, grinding machine parts, broaching, etc., can solve the problems of unusable broaching, reducing the efficiency of rough broaching, increasing the cost of rough broaching, etc. the effect of

Active Publication Date: 2020-09-29
HARBIN TURBINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problem that when one or several rough broaches in a whole set of rough broaches are damaged during the rough broaching of the existing steam turbine wheel grooves, the whole set of broaches cannot be used, and only the matching broaches can be re-customized. The rough broaching tool can ensure the whole set of re-use, which increases the cost of rough broaching work and reduces the problem of rough broaching efficiency, and then provides a method for determining the amount of special grinding of the rough broaching tool used for steam turbine wheel groove broaching

Method used

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  • A Method for Determining the Special Grinding and Grinding Amount of the Rough Broach Used in Steam Turbine Groove Broaching
  • A Method for Determining the Special Grinding and Grinding Amount of the Rough Broach Used in Steam Turbine Groove Broaching
  • A Method for Determining the Special Grinding and Grinding Amount of the Rough Broach Used in Steam Turbine Groove Broaching

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specific Embodiment approach 1

[0043] Specific implementation mode one: combine figure 1 with figure 2 Describe this embodiment, a kind of steam turbine wheel groove broaching method for determining the special grinding and grinding amount of a rough broach in this embodiment, the method is realized by the following steps,

[0044] Step 1. Flaw detection inspection of damaged broach:

[0045] Before regrinding the damaged broach, the broach should be inspected for flaw detection. After the flaw detection inspection, the broach with cracks will be scrapped; the broach without cracks will be used as a spare;

[0046] Step 2. Inspection before grinding:

[0047] Refer to the broach broach allowance A of the broach without cracks according to the drawings, and check the tooth lift of the broach a f ;Put the damaged broach on the marble platform, and use the height gauge to measure the damage height h of the damaged tooth 1 and width b, to provide a basis for calculation;

[0048] Step 3. Calculate the num...

specific Embodiment approach 2

[0075] Specific implementation mode two: combination figure 1 and figure 2 The present embodiment will be described. The flaw detection method of the flaw detection inspection of the damaged broach described in Step 1 of the present embodiment is magnetic particle flaw detection or coloring flaw detection. Other compositions and connections are the same as in the first embodiment.

[0076] The basic principle of magnetic particle flaw detection: when the workpiece is magnetized, if there is a defect on the surface of the broach, magnetic flux leakage will occur due to the increase of the magnetic resistance at the defect, forming a local magnetic field, and the magnetic powder will display the shape and position of the defect here, thereby judging the presence of defects.

[0077] The basic principle of coloring flaw detection: the surface of the broach is coated with colorant, and the colorant penetrates into the damaged part. Rinse off the colorant on the surface after s...

Embodiment 1

[0079] Use the magnetic particle flaw detection method to inspect the damaged broach to ensure that the broach has no cracks before distributing the amount of tooth lift according to the following method, and then regrinding or reforming.

[0080] After the damaged broach has no cracks after the flaw detection inspection, check the tooth lift of the broach according to the drawing a f ;Put the damaged broach on the marble platform, and use the height gauge to measure the damage height h of the damaged tooth 1 and width b, to provide a basis for calculation;

[0081] When the number of damaged teeth of the damaged broaches n 1 =1, determine the number n of teeth to be ground and the amount of ground to be a 1 :

[0082] Determine the number of grinding teeth n:

[0083] when h 1 >a f or , the damaged broach teeth are scrapped, and the number of teeth to be repaired is:

[0084]

[0085] when h 1 f or When , by allocating the gear lift, the number of teeth to be g...

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Abstract

The invention discloses a method for determining the grinding amounts of special grinding for roughing broaches used for steam turbine trough broaching and relates to the technical field of mechanicalcutting machining and manufacturing. The method provided by the invention succeeds in solving the problems that when an existing steam turbine trough is subjected to rough broaching, when one or several roughing broaches in a complete set of roughing broaches are damaged, the complete set of broaches can not be used, the complete set can be guaranteed to be reused until roughing broaches matchedwith the damaged broaches are retailored, the rough broaching work cost is increased, and the rough broaching efficiency is reduced. According to the method for determining the grinding amounts of special grinding for the roughing broaches used for steam turbine trough broaching, the method is implemented through the following steps that firstly, flaw detection check is performed on the damaged broaches; secondly, check is performed before grinding; thirdly, the number of broach teeth needing to be ground is calculated according to measuring results; and fourthly, the grinding amounts a1 for all the teeth are determined. The method provided by the invention is used for determining the reasonable grinding amounts of irregular grinding for the roughing broaches used for steam turbine troughbroaching.

Description

technical field [0001] The invention relates to the technical field of mechanical cutting, processing and manufacturing, in particular to a method for determining the special grinding amount of a rough broach used for broaching a steam turbine wheel groove. Background technique [0002] When broaching the wheel groove of the steam turbine, the machining accuracy is required to be high, so the precision of the broach used for the machining of the wheel groove of the steam turbine wheel is also high. In order to ensure the broaching accuracy of the steam turbine wheel grooves, the worn and chipped broaches must be ground every time 3 to 4 steam turbine wheel grooves are processed. This kind of grinding belongs to ordinary grinding. The working stability of the broach after grinding will decrease, but it can still be used. [0003] However, when the rough broaching tool is used for the rough broaching of the steam turbine wheel groove, the rough broaching tool will be damaged ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B3/16B24B49/00
Inventor 訾凯崧孙盛丽孙海珉王伟姜秀英薛红玉刘剑赵祎昕储继影徐艳
Owner HARBIN TURBINE
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