Valve seat and manufacturing method thereof
A manufacturing method and valve seat technology, which is applied in the direction of manufacturing tools, machines/engines, mechanical equipment, etc., can solve problems such as methods without any teaching, and achieve the effect of improving valve cooling capacity, excellent wear resistance, and performance improvement
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Embodiment 1
[0054] A base material ring with an outer diameter of 25mmφ, an inner diameter of 21mmφ, and a height of 6mm with a working surface inclined at 45° from the axial direction made of a Cu-based alloy containing 1.2% by mass will have Cr: 8.5 %, Mo: 28.5%, Si: 2.5%, C: 0.05%, and the balance is Co-based alloy composed of Co (hereinafter referred to as "Co-based alloy A"), and the powder with an average particle size of 63 μm is output by laser The laser metal deposition method with an output power of 1.5kW is directly surfacing on the working surface of the substrate ring to form a thin layer with a thickness of about 0.3mm. Furthermore, the thickness of the sheet layer on the working surface was processed to 0.2 mm to prepare a valve seat sample.
[0055] [1] Determination of valve cooling capacity (valve temperature)
[0056] use Image 6 The bench test machine shown measures the valve temperature and evaluates the valve cooling capability. The valve seat sample is set in th...
Embodiment 2～7
[0061] As shown in Table 1, change the material and thickness of the sheet layer, and the size of the base ring (height, h / a, but keep the outer diameter at 25mmφ, and change the thickness a by changing the inner diameter). A valve seat sample was produced in the same manner as in Example 1, and the valve temperature was measured by a bench test in the same manner as in Example 1. The results are shown in Table 1 together with the results of Example 1. It can be seen that when the height h of the valve seat is reduced, that is, the ratio (h / a) of the height h of the valve seat to the thickness a is reduced, the cooling capacity of the valve is improved. In addition, the materials A to D of the sheet layer hardly cause a difference in the valve cooling performance.
[0062] Table 1
[0063]
[0064] Among them, "laser" means laser metal deposition method, "material A" means Cr: 8.5%, Mo: 28.5%, Si: 2.5%, C: 0.05%, and the balance is Co, "material B" means Cr: 28% , W: 4%,...
Embodiment 8～15
[0066] The material of the base ring was changed to 99.9% Cu, and a valve seat sample was produced in the same manner as in Example 1 according to the material and thickness of the sheet layer and the size of the base ring shown in Table 2, and passed through the stage in the same manner as in Example 1. The rack test is used to measure the valve temperature. The results are shown in Table 2. It can be confirmed that changing the material of the base ring to 99.9% Cu increases the thermal conductivity of the base ring to 400W / (mK), and the thickness of the sheet layer and the size of the valve seat (h / a) have a significant effect on the cooling capacity of the valve. make an impact.
[0067] Table 2
[0068]
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