A kind of large round knife and its manufacturing method
A manufacturing method and technology of round knives, applied in the direction of manufacturing tools, knives for shearing machine devices, furnace types, etc., can solve the problems of high production scrap rate, short service life, uneven hardness, etc., and reduce labor intensity, Eliminate as-cast porosity and optimize microstructure
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Embodiment 1
[0041] Such as figure 1 with figure 2 As shown, a large round knife includes a blade body 1, a fixing hole 2, a blade 3 and a mounting hole 4; its specification is φ610×70×5.5mm; the traditional heat treatment process of this large round knife generally adopts direct quenching after normalizing, cooling and then Tempering, this method causes a large amount of deformation of the workpiece after quenching, mainly manifested in the unevenness of the surface of the large round knife, poor flatness, large finishing allowance of the subsequent grinding machine, waste of material, and prolonged processing time; after the improvement, after the quenching step Increase the leveling step, but the large round knife after leveling by the press is prone to cracking, and the cracked products cannot be followed up, resulting in a high scrap rate. In order to solve the above problems, the present invention adopts the following technical solutions.
[0042] A method for manufacturing a larg...
Embodiment 2
[0058] A method for manufacturing a large round knife, the steps are:
[0059] 1) The raw material is hot-rolled plate, and its composition mass percentage is C: 0.60-0.70%, Si: 0.11-0.37%, Mn: 0.90-1.20%, S≤0.035%, P≤0.035%, Cr≤0.25%, Ni ≤0.25%, Cu≤0.25%, the balance is Fe;
[0060] 2) Roughly process the raw material in step 1): use plasma wire cutting to cut to such as figure 1 The semi-finished product shown; then drill the blade body 1, process the fixing hole 2 and the installation hole 4; remove the burr, check the material crack and interlayer defect;
[0061] 3) Normalizing, put the large round knife after the rough machining in step 2) horizontally into a 90kw box-type resistance belt furnace and heat it to 860°C, adjust the heating coefficient to 1.4min / mm, keep it warm for 8min, and then leave the furnace;
[0062] 4) Place the large round knife out of the furnace in step 3) on a metal platform with a surface roughness of Ra 1.6 and a surface hardness of 60HRC, u...
Embodiment 3
[0073] A method for manufacturing a large round knife, the steps are:
[0074] 1) The raw material is hot-rolled plate, and its composition mass percentage is C: 0.60-0.70%, Si: 0.11-0.37%, Mn: 0.90-1.20%, S≤0.035%, P≤0.035%, Cr≤0.25%, Ni ≤0.25%, Cu≤0.25%, the balance is Fe;
[0075] 2) Roughly process the raw material in step 1): use plasma wire cutting to cut to such as figure 1 The semi-finished product shown; then drill the blade body 1, process the fixing hole 2 and the installation hole 4; remove the burr, check the material crack and interlayer defect;
[0076] 3) Normalizing, put the large round knife after the rough machining in step 2) horizontally into a 90kw box-type resistance belt furnace and heat it to 900°C, adjust the heating coefficient to 1.6min / mm, keep it warm for 10min and then leave the furnace;
[0077] 4) Place the large round knife out of the furnace in step 3) on a metal platform with a surface roughness of Ra 0.8 and a surface hardness of 56HRC, u...
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