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    热门关键词: 齿条展示 生产车间
    当前位置:首页>新闻资讯>新闻动态>防止齿条热处理的流程是什么?

    防止齿条热处理的流程是什么?

    来源:http://www.jnzkjx.cn/ 日期:2020-06-23 发布人:kaizejixie
    齿条是齿轮传动部件的一种,是齿轮外径趋于∞的一种特殊形式。通常情况下,扇形齿条在铣齿加工前将毛坯锻成整个圆环,整体进行热处理,热处理消除应力后将锻件圆环毛坯,按齿圈各道工序预留出加工流量,在立车上将扇形外形车成,为防止变形,车削完成后还需要进行消除应力的自然时效处理,之后再按图样实际尺寸切开,成为单个齿条,然后在进行铣齿加工。
    Rack is a kind of gear transmission component, which is a special form of gear outer diameter tending to ∞. Generally, before gear milling, the sector rack will forge the blank into the whole ring, and conduct heat treatment as a whole. After heat treatment and stress relief, the forging ring blank will be reserved according to each process of gear ring, and the processing flow will be reserved. The sector shape will be turned on the vertical lathe. In order to prevent deformation, the natural aging treatment of stress relief needs to be carried out after turning, and then cut according to the actual size of the drawing Open, become a single rack, and then milling.
    齿条形状多数为直线型,齿面硬度要求为240~280HBW。本次生产的齿条是船舶起重机浮吊上使用的传动部件,齿条选用材质为锻件42CrMo,齿面硬度为290~320HBW,齿条外形为110°扇形齿面,订货数量为4件。
    The shape of rack is mostly linear, and the hardness of tooth surface is required to be 240-280hbw. The rack produced in this production is the transmission part used on the floating crane of the ship crane. The rack is made of forging 42CrMo, the hardness of the tooth surface is 290-320hbw, the shape of the rack is 110 ° sector tooth surface, and the order quantity is 4 pieces.
    这种新结构、硬齿面齿条加工在我公司属生产,如果采用常规的锻整圈毛坯的加工方法,三个齿条锻成一个圆圈毛坯,3个齿条外形为330°,而整个锻圈为360°,当逐个切割完毕后,有一个齿条会缩尺。如果采用两个齿条锻成一个圆圈毛坯,2个齿条外形为220°,4件齿条锻成2个整圈毛坯,会造成50%的材料及加工浪费。同时由于整个扇形齿条外径达5343mm(m=26,z=207,齿条外径D= mz+2m),调质时,需要有大型的热处理设备(6.0m×5.5m)。
    This new structure and hard tooth surface rack processing is the first production in our company. If the conventional processing method of forging the whole ring blank is adopted, three racks are forged into one ring blank, the shape of three racks is 330 °, and the whole forging ring is 360 °. After cutting one by one, one rack will shrink. If two racks are used to forge a circle blank, the shape of two racks is 220 °, and four racks are forged into two whole circles blank, which will cause 50% waste of materials and processing. At the same time, because the outside diameter of the whole sector rack is 5343m m (M = 26, z = 207, d = MZ + 2m), large heat treatment equipment (6.0m × 5.5m) is needed for tempering.
    而目前公司设备无法满足整个齿圈的整体毛坯调质需要,为了降低材料及加工成本,提高公司现有设备使用率,如何在齿条的热处理过程中,在保证齿条硬度的前提下,选择合适形式的热处理防变形,使齿条在热处理时及之后应力释放均匀,齿条变形量小,是该齿条加工的难点之一。为此,我们决定采用对单件齿条进行锻造及加工和热处理的工艺方法,确保齿条加工的质量。
    At present, the equipment of the company can't meet the needs of the whole ring gear. In order to reduce the cost of materials and processing, and improve the utilization rate of the existing equipment, how to choose the appropriate form of heat treatment to prevent deformation during and after the heat treatment of the rack under the premise of ensuring the hardness of the rack, so that the stress release of the rack is even during and after the heat treatment, and the deformation of the rack is small, which is the reason why the rack One of the difficulties in strip processing. Therefore, we decided to adopt the forging, processing and heat treatment of single rack to ensure the quality of rack processing.
    为了防止齿条在热处理过程中产生无法校正的变形,通过对齿条加工工艺方法的探讨,结合热处理工艺方法,保证单个齿条在调质后具有足够高的强度、硬度,良好的塑性和韧性及高的加工精度。
    In order to prevent the uncorrectable deformation of the rack in the heat treatment process, through the discussion of the rack processing technology, combined with the heat treatment technology, to ensure that a single rack has enough high strength, hardness, good plasticity, toughness and high processing accuracy after tempering.
    首先对齿条粗开齿后、热处理前应力释放后导致的变形进行检测,根据变形情况选择合适的加工余量。余量的选择为:齿条采用粗开齿后进行调质,齿侧每面留8mm余量,齿底留有25mm余量,外圆每面留16mm,幅板上下端面分别留40mm、15mm余量,确保一旦发生变形后有足够加工余量将变形量拟补,为后续加工提供了保障,图1为齿条加工余量示意。
    First of all, the deformation caused by the stress release after the rack rough tooth opening and before the heat treatment is detected, and the appropriate machining allowance is selected according to the deformation. The selection of allowance is as follows: the rack is adjusted and tempered after rough tooth cutting, 8mm allowance is left on each side of the tooth, 25mm allowance is left on the bottom of the tooth, 16mm allowance is left on each side of the outer circle, 40mm allowance is left on the upper and lower end faces of the plate respectively, so as to ensure that there is enough machining allowance to supplement the deformation once deformation occurs, which provides guarantee for subsequent processing. Figure 1 shows the rack machining allowance.