Forming method of powder metallurgy high-speed steel
A forming method and technology of powder metallurgy, which is applied in the forming field of powder metallurgy high-speed steel, can solve the problems of short service life, low density, and low overall hardness of powder metallurgy high-speed steel workpieces, and achieve high hardness, high bending strength and red hardness. The effect of high value and improved mechanical properties
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Embodiment 1
[0034] Embodiment 1: Hardness detection, the hardness of the high-speed steel after heat treatment is relatively high, and the cylindrical block with a height of 5 mm cut from the bar by a wire cutting machine is used to measure the hardness after the cylindrical block is ground and polished by a Rockwell hardness testing machine , the test pressure is 150kg, and the holding time is 10s. Measure 7 data on the measurement surface of the sample, remove the highest and lowest values, and then take the average value.
[0035] Preferably, in the step S1, the parameters of the press are set to a pressure of 1200 MPa, a holding pressure of 10-20 s, and a running speed of the slider of 8-12 mm / s.
[0036] Preferably, in the step S2, the parameters of the hot extrusion machine are set as follows: the running speed of the slider is 12-15mm / s, the temperature of the extrusion die is 300°C, and the surface of the die is lubricated with graphite milk during the extrusion process.
[0037] ...
Embodiment 2
[0039] Embodiment 2: Density detection, the sample that length is 10mm is made by wire-cutting machine cutting bar stock, with sandpaper the line-cut trace of sample two ends is removed, then carry out experiment, adopt the principle of Archimedes drainage method, air The weight is measured with an analytical balance, and then weighed in water with an accuracy of 1 mg.
[0040] The degree calculation formula is:
[0041] In the formula, ρ is the actual density of the sample (g / cm 3 ), ph is the density of the water used in the experiment (g / cm 3 ), Ma is the weight of the sample in air (g), Mw is the weight of the sample in water (g), wash the sample in alcohol, repeat the test 7 times, take the average value, each time the water The weight of the test sample dried in the air after the test, the calculation formula of the density dr of the sample is:
[0042] ρt is the theoretical density of M32 powder high speed steel (g / cm 3 ).
Embodiment 3
[0043] Example 3: Bending strength testing, the bar is cut by a wire cutting machine to make a square sample with a size of 2 (H) x 4 (W) x 22 (L), with a span of 56mm, and a polishing machine The surface of the sample is ground and polished, and the bending strength of the sample is measured by the standard three-point bending method. The calculation formula of the bending strength is:
[0044] Where: L is the span (mm), σf is the flexural strength or transverse fracture strength (MPa), F is the breaking load (N), W is the sample width (mm), and H is the sample height (mm).
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