Selection of tools for thermal spraying workpiece turning
Tool selection criteria for turning thermally sprayed workpieces
(1) When the hardness of the thermal spray coating is less than HRC45, the carbide tool material can be selected, and the linear speed can be selected as νc=40 m/min.
(2) When the hardness of the thermal spray coating is greater than HRC45, ceramic or CBN tools can be used; ceramic tools and welded composite CBN tools are often used in finishing due to their poor impact resistance (the depth of the knife is preferably within 0.3mm).
(3) When the hardness of the thermal spray coating is greater than HRC55, CBN tools can have better tool life and processing efficiency.
Cutting parameters of tools when machining thermal spray materials
(1) Carbide cutting tools:
The depth of the knife is often taken as aO=0.15~0.6mm, the higher the surface hardness, the smaller the aP should be.
aP=0.05～0.1mm during fine turning. The feed rate is generally taken as f=0.1～1mm/r, and f should be smaller during fine turning.
When the thermal spray hardness is HRC45-65, the line speed is generally Vc=10 m/min.
(2) Ceramic cutting tools:
The cutting depth is generally controlled within 0.2mm, and the feed rate f=0.1mm/r; however, the linear speed can be increased to about 3 times that of the original cemented carbide.
The spraying material is cobalt-based spraying material, and the spraying thickness is 2mm; the hardness is HRC60;
It is suitable for large allowance cutting; the cutting parameters used for rough machining are the linear speed V=70m/min; the cutting amount is 0.7-0.8mm/r; the cutting depth ap=1.7mm; the finishing is 120m/min; the cutting amount is 0.25 mm/r.
---EDITOR: Anna Wang
---POST: Cynthia Lee