保定市清苑区模板加工厂

模具热处理方法和加工工艺的选择同样要根据模具的工作条件、失效方式和对性能的不同要求来确定。应不断改善热处理设备，改进热处理工艺，使材料的强度、韧性得到最佳配合，并严格遵循热处理工艺，控制加热温度、时间、冷却速度，从而保证模具的使用性能。深圳拓维塑胶模具配件商家讲解下V3N钢模具的加工工艺

The selection of die heat treatment method and processing technology is also determined according to the working condition, failure mode and different requirement of performance. Should continue to improve heat treatment equipment, improve the heat treatment process, make the strength and toughness of material is the best match, and strictly follow the heat treatment process, controlling heating temperature, time, cooling rate, thus ensuring the use of mold performance. The processing technology of V3N steel mould is explained by the company of the plastic mould parts in shenzhen

　　1.锻造

1. The forging

　　V3N钢含有大量的一次碳化物和二次碳化物，若保留在淬火组织中，将急剧降低模具所有寿命。只有通过对原材料改锻，击碎碳化物，才能使其呈细小、均匀的形貌分布于钢基体，提高整体力学性能。V3N钢导热性差，锻坯加热时应充分预热，始锻温度1170℃，终锻温度950℃，设备可采用250kg(小件)和400kg空气锤，开始采用轻锤快打，中间用重锤打，最后慢打轻打，锻后于石棉粉箱中缓冷取出后即进行

V3N steel contains a large amount of carbide and secondary carbide, which, if retained in quench, will dramatically reduce the die life. Only by forging and forging the raw material, can it be small and uniform, which can be distributed to the base of the steel and improve the overall mechanical properties. Steel V3N poor heat conductivity, heat forging stock should be fully preheat, initial forging temperature 1170 ℃, the final forging temperature 950 ℃, the equipment can be used 250 kg (small) and 400 kg air hammer, started using light hammer spine-ripping, intermediate with a heavy hammer, the slow tap, asbestos powder box after forging after slow cooling out

退火处理。

Annealing treatment.

　　2.锻后退火

After forging, annealing

　　可采用等温退火或普通860 oC退火4小时. 机械加工锻后硬度较高，采用等温或普通退火后，机加可顺利进行，淬火后因工硬度较高，故工件成型磨削难度较大，可采用镨铌刚玉加铬制作的砂轮进行磨削。

Isothermal annealing can be used or ordinary 860 oC annealing 4 hours. Mechanical processing high hardness after forging, using isothermal or normal after annealing, machine can run smoothly, because be versed in after quenching hardness is higher, so the workpiece forming grinding is difficult, can be made of praseodymium niobium chromium corundum and grinding wheel for grinding.

　　3.热处理工艺

Heat treatment process

　　V3N钢在1220～1230℃淬火时，由于存在未熔碳化物，硬度偏低，系淬火温度不足;在1260～1270℃淬火时，晶粒明显过大，系过热现象。选择1230～1240℃淬火加热温度既能使碳化物和合金元素充分溶解到奥氏体中去，又能保持较细晶粒(10～10级)。

Steel V3N during 1220 ~ 1230 ℃ quenching, because there are not melt carbide of low hardness, quenching temperature; In 1260 ~ 1270 ℃ quenching, the grain size is too big, obviously is overheating. Select 1230 ~ 1240 ℃ quenching heating temperature can make carbide and dissolves into austenitic alloy elements, and to maintain the fine grained (10 ~ (10).

　　V3N超硬高速钢模具部件采用1220～1230℃经550℃四次回火，硬度可控制在HRC64～67，具体可根据零件尺寸的大小从热处理工艺上进行调整，达到硬度和强度较理想的配合，V3N超硬型高速钢淬火后有较多残余奥氏体，据测定约为25%～30%，必须尽量消除减少，为此进行多次高温回火使之发生马氏体转变。进行4次高温回火后，大部分残余奥氏体发生了马氏体转变，产生二次硬化效应。V3N钢二次硬化效应温度比普通高速钢高30～40℃，这一特性十分宝贵，表明V3N钢有更高红硬性。

V3N superhard high speed steel mold parts with 1220 ~ 1230 ℃ 550 ℃ tempering, four hardness can be controlled in HRC64 ~ 67, concrete can be according to the size of the parts size adjusted from heat treatment process, the hardness and strength of the ideal, V3N superhard type high speed steel after quenching residual austenite more, according to the measurement is about 25% ~ 30%, must eliminate reduce as far as possible, for high temperature tempering martensite transformation to happen many times. After four high temperature tempering, most of the remaining austenite changes, resulting in a secondary hardening effect. Steel V3N secondary hardening effect 30 ~ 40 ℃ temperature is higher than common high speed steel, this feature is very valuable, show that V3N steel has higher red hardness.