Preparation process of TiCN multilayer composite coating layer on slotting cutter surface of steam turbine rotor

A technology of steam turbine rotor and wheel groove milling cutter, which is applied in the direction of metal material coating process, coating, ion implantation plating, etc.

Active Publication Date: 2015-12-16
SHANGHAI INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process provides a set of strict pre-treatment and post-treatment solutions for coated tools. The pre-treatment effectively improves the bonding force between the coating and the tool substrate, and solves technical problems such as easy peeling of the coating. The

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  • Preparation process of TiCN multilayer composite coating layer on slotting cutter surface of steam turbine rotor
  • Preparation process of TiCN multilayer composite coating layer on slotting cutter surface of steam turbine rotor

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Embodiment Construction

[0024] The technical scheme of the coating preparation process adopted in the present invention is: according to the rotor material, tool material, cutting processing method, tool geometry ( figure 1 ), cutting processing requirements, etc. for coating design, including coating composition, coating structure, and coating process. The coating adopts a multi-layer structure, with TiN and TiCN as alternating coatings, and an alternating coating of TiN coating 1 and TiCN coating 2 with 50 layers is prepared on the surface of the groove milling cutter ( figure 2 ), TiN is the bottom layer, and the outermost layer is TiCN. The TiN / TiCN multi-layer composite coating is deposited by cathodic arc technology, the deposition temperature is low, and there is no damage to the tool substrate 3. The prepared coating has small thermal stress, uniform and dense surface, and good finish. TiN is used as the base layer and intermediate transition layer to ease the intrinsic stress of coating gr...

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Abstract

The invention relates to a preparation process of a TiCN multilayer composite coating layer on a slotting cutter surface of a steam turbine rotor; and the preparation process comprises surface pretreatment of a cutter basal body, cleaning, cutter clamping and loading, preparation of the multilayer composite coating layer, cooling and discharge, and aftertreatment. The multilayer structure formed by the coating layer preparation process uses TiN and TiCN as alternating coating layers to prepare 50 TiN and TiCN alternating coating layers on the slotting cutter surface; TiN is the backing layer; and TiCN is the outermost layer. The coating layer prepared by the method relieves the residual stress of the coating layer and the cutter basal body, so that the bonding force of the basal body and the coating layer is larger, the bonding degree of the coating layer is higher, and the coating layer is not easy to be stripped off. In addition, C atoms are introduced based on TiN to cause the lattice distortion and the solid solution strengthening effect, so that the surface hardness of the cutter basal body can reach HV3500, the cutter wear resistance is improved, the cutter service life is prolonged, the machining quality of the steam turbine rotor is guaranteed, and the production cost is reduced.

Description

technical field [0001] The invention relates to a metal processing tool coating, in particular to a preparation process for a TiCN multi-layer composite coating on the surface of a fir tree-shaped milling cutter used for processing steam turbine rotor wheel grooves. The multi-layer composite coating adopts TiN and Alternate coating forms of TiCN. Background technique [0002] The rotor is one of the most difficult, longest and most expensive core components in the production of steam turbines. Its fir tree-shaped wheel groove has complex shape and high dimensional accuracy, and the rotor is currently commonly used as a new material 26NiCrMov145, which has good toughness but poor thermal conductivity. , The work hardening is serious, so when machining the rotor fir tree groove, the cutting heat is large, the chip removal is poor, the cutting temperature is high, the groove tool wear is serious, the tool life is low, and the rotor processing efficiency and quality are affected...

Claims

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Application Information

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IPC IPC(8): C23C28/04C23C14/32C23C14/06
CPCC23C28/042C23C28/044C23C28/42
Inventor 张东民张而耕盛育东张绍青姚松骏
Owner SHANGHAI INST OF TECH
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