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    當前位置:首頁>新聞中心>公司新聞>如何使滾絲輪使用的壽命延長?

    如何使滾絲輪使用的壽命延長?

    來源:http://www.wuyinlpjm.cn/ 日期:2021-10-14 發布人:hengxin

    為了保證汽車螺紋緊固件和高強度螺栓的精度,提高螺紋的疲勞強度,采用滾壓螺紋技術。滾絲是用螺紋板或滾絲輪工具通過滾絲工藝制造的螺紋,而不是車削成型。滾絲輪是用于常溫下滾絲緊固件的螺紋,而不是刀具。不需要硬度過大、紅硬性高;工作螺紋(齒)在服役時應承受小能量、強摩擦的多重沖擊,并應具有高強度、高耐磨性、合適的硬度和良好的韌性。

    In order to ensure the accuracy of automotive threaded fasteners and high-strength bolts and improve the fatigue strength of threads, rolling thread technology is adopted. Thread rolling is the thread made by thread rolling process with thread plate or thread rolling wheel tool, rather than turning. The thread rolling wheel is used to roll the threads of fasteners at room temperature, not tools. No need for excessive hardness and high red hardness; When in service, the working thread (tooth) shall bear the multiple impact of small energy and strong friction, and shall have high strength, high wear resistance, appropriate hardness and good toughness.
    在觀察軋制螺紋的截面積時,不允許出現紋路位移連續、不斷裂、根部不完整或螺紋其他缺陷,不允許螺紋不分方向重疊,只允許大直徑有微小偏差,螺紋的軋制必須一次冷軋成型。除非合同圖紙上另有說明,螺紋的軋制必須在熱處理后進行。因此,對滾絲輪的質量提出了更高的要求。由于熱處理、冷加工和操作使用不當等因素,容易造成滾絲輪開裂損壞和早中期失效,不僅影響生產工藝和產品質量,而且增加生產成本。因此,有必要延長線材軋制模具的使用壽命。
    When observing the cross-sectional area of the rolled thread, it is not allowed to have continuous grain displacement, no fracture, incomplete root or other defects of the thread, it is not allowed to overlap the thread regardless of direction, and only small deviation of large diameter is allowed. The rolling of the thread must be cold rolled at one time. Unless otherwise specified on the contract drawings, the rolling of threads must be carried out after heat treatment. Therefore, higher requirements are put forward for the quality of wire roller. Due to improper heat treatment, cold working and operation, it is easy to cause cracking damage and early and medium-term failure of wire roller, which not only affects the production process and product quality, but also increases the production cost. Therefore, it is necessary to prolong the service life of wire rolling die.
    1、熱處理工藝的影響
    1. Influence of heat treatment process
    脫碳、奧氏體晶粒粗大、回火不足和碳化物不均勻是滾輪熱處理的四大致命缺陷。碳化物不均勻性主要是由原材料引起的,由于鍛造未成形或不足,已演變成熱處理缺陷。
    Decarburization, coarse austenite grain, insufficient tempering and uneven carbide are the four fatal defects of roller heat treatment. The non-uniformity of carbide is mainly caused by raw materials. Due to unformed or insufficient forging, it has evolved into heat treatment defects.
    滾絲輪采用真空零保溫加熱淬火新工藝,具有表面堅硬、內部韌性好、耐磨、抗疲勞裂紋等優點;基體核心以板條馬氏體為主,具有較高的強度和韌性,能吸收較大的沖擊力,防止裂紋萌生和擴展,能有效防止牙齒脫碳過熱和晶粒尺寸大等難以發現和檢測的缺陷,避免牙齒崩齒、掉齒、剝落和磨損等。質量優良,使用壽命長。
    The new technology of vacuum zero insulation heating and quenching is adopted for the wire roller, which has the advantages of hard surface, good internal toughness, wear resistance and fatigue crack resistance; The matrix core is mainly lath martensite, which has high strength and toughness, can absorb large impact force, prevent crack initiation and propagation, effectively prevent tooth decarburization, overheating, large grain size and other defects that are difficult to find and detect, and avoid tooth collapse, tooth loss, peeling and wear. Excellent quality and long service life.
    2、使用不當對使用壽命的影響
    2. Influence of improper use on service life
    1滾絲機精度差,振動大,運轉不正常時使用;
    1. The wire rolling machine has poor precision and large vibration, and can be used when the operation is abnormal;
    2滾絲模具對位不正,被滾壓件發生軸向位移,牙紋受到剪切和擠壓兩種應力作用;
    2. The alignment of wire rolling die is not correct, the rolled part has axial displacement, and the tooth pattern is subjected to shear and extrusion stress;
    3被滾壓螺紋絲坯尺寸大小不均,表面未清理干凈,有砂輪沫、氧化皮和污臟物;
    3. The size of the rolled thread blank is uneven, the surface is not cleaned, and there are grinding wheel foam, oxide scale and dirt;
    4滾壓件硬度不均勻(8.8級螺栓應在27~30HRC;10.9級應在35~37HRC),防止有時因管理不善將未經回火的高硬度(50~55HRC)的淬火件混和入回火件中,其硬度與滾絲輪牙紋刃口硬度相近,導致崩刃;
    4. The hardness of rolled parts is uneven (grade 8.8 bolts shall be 27 ~ 30hrc; grade 10.9 bolts shall be 35 ~ 37hrc), so as to prevent the quenched parts with high hardness (50 ~ 55HRC) without tempering from being mixed into the tempered parts due to poor management, and its hardness is similar to that of the tooth edge of the wire roller, resulting in edge collapse;
    5滾壓時用機油,或者液壓油,未加入滾絲油,造成潤滑不足摩擦,使牙尖溫度急劇升高至超過滾絲輪回火溫度,牙紋過度回火被軟化,發生倒牙、堆牙失效;
    5 when rolling, oil or hydraulic oil is used without wire rolling oil, resulting in insufficient lubrication and friction, resulting in sharp increase of tooth tip temperature beyond the return fire temperature of wire rolling wheel, excessive tempering and softening of tooth lines, and failure of inverted teeth and pile teeth;
    6滾絲輪出廠前必須完全退磁,留下剩磁。工作時齒型吸附的細鐵泡沫會加速磨損失效。
    6 the wire roller must be completely demagnetized before leaving the factory, leaving residual magnetism. When working, the fine iron foam adsorbed on the teeth will accelerate the wear failure.

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