Abrasive evaluation method for mold steel and mold
An evaluation method and abrasiveness technology, which is applied in the direction of polishing compositions containing abrasives, testing wear resistance, measuring devices, etc., can solve problems such as "uneven appearance, poor surface properties, and reduced appearance quality of molded products, and achieve Low-cost, simple and cost-effective
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Embodiment 1
[0041] P21 steel which is a standard steel type of AISI and SCM440 steel which is a standard steel type of JIS were prepared, and their abrasiveness was evaluated. These types of steels are materials that differ in surface properties after the processing (in other words, differ in abrasiveness) even when they are subjected to grinding processing under the same conditions at respective applicable normal prehardening hardnesses. P21 steel is generally considered to be a steel for molds with good abrasiveness. SCM440 steel is considered to be steel for molds with poor abrasiveness compared to P21 steel.
[0042] First, these steels were quenched and tempered to make them the normal pre-hardened hardness respectively. The P21 steel was adjusted to 40HRC, and the SCM440 steel was adjusted to 26HRC to obtain a sample with a size of 10×10×20mm. Next, grinding was performed on one plane of these samples under the conditions implemented in actual mold production. The details of the g...
Embodiment 2
[0051] An improved steel of SUS420J2 steel which is a JIS standard steel type and the above-mentioned P21 steel were prepared, and their abrasiveness was evaluated. First, quench and temper these steels with a size of 100×100×10mm, adjust the SUS420J2 improved steel to 30HRC, and P21 steel to adjust to 40HRC. Next, after dividing one plane (100×100 mm) of these samples into three regions A, B, and C of 50×30 mm with a scribe line, each region is subjected to grinding under the conditions implemented in actual mold making . The details of the grinding process are as follows. For the area A, grinding process was performed in the order of grinding wheel and sandpaper, and finally, finishing process was performed with #2000 sandpaper (the average particle diameter of the abrasive grains was about 10 μm). The remaining areas B and C are ground in the order of grinding wheel, sandpaper, and diamond paste. Area B is finished with #5000 diamond paste (the average grain size of the ab...
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