气弹簧

1.弹簧的材料与技术要求
弹簧的材料为50CrVA钢，技术要求硬度HRC45-49；在规定的负荷内压缩弹簧的长度变化应符合要求。螺旋压缩弹簧加工工艺流程为：卷簧→再结晶退火→切断、修正→淬火→回火→抛光→磨端面→校正→低温去应力→成品。
2.螺旋压缩弹簧的热处理工艺
(1)再结晶退火
弹簧卷制成型后，必须进行再结晶退火处理，使弹簧几何尺寸稳定，减少淬火时的变形。再结晶退火温度为550—650℃，保温1—1.5h后空冷。少量可在盐浴炉中进行，大批量采用连续式电阻炉通控制气氛。
(2)淬火
在盐浴炉淬火加热时，应将弹簧用铁丝均匀地捆扎好，或将弹簧套在芯棒上加热。加热时要弹簧表面五氧化与脱碳。盐浴应经过仔细脱氧。也可在可控气氛的箱式炉中加热，加热温度为850℃±10℃，保温10—15min，出炉淬油冷透。
(3)回火
淬火后回火可进行两次。行矫正回火，矫正回火温度一般应低于终回火温度20℃左右，保温10—15min，出炉空冷。然后进行终回火，在弹簧尺寸矫正后，将弹簧装在回火定型夹具上进行终回火。回火定型夹具应弹簧的螺距和自由长度符合要求。回火温度为420℃±10℃，保温30—35min，出炉水冷。
(4)抛丸处理
为提高弹簧的疲劳强度需进行抛丸处理。弹丸直径0.3—0.5mm。采用压缩空气喷射时，压缩空气压力为0.4—0.5MPa；用离心机抛丸，弹丸的线速度为70m/s。经抛丸处理的弹簧使用寿命能提高一倍以上。

中译英：
1 Spring material and technical requirements
Spring materials for 50CrVA steel, the hardness of HRC45-49technical requirements; in terms of the load within the compression spring length changes shall conform to the requirements. Helical compression spring processing technological process is: spring roll, recrystallization annealing, quenching, tempering, correction and cutting, polishing, grinding end face, correction, low temperature stress, the finished product.
2 Helical compression spring heat treatment process
(1) the recrystallization annealing
Spring roll forming, must undertake the recrystallization annealing treatment, so that the spring stable geometric size, reducing the quenching deformation of. Recrystallization annealing temperature is 550℃-650 ℃, holding1- 1.5h air cooling. A small amount in the salt bath furnace in large quantities, using continuous resistance furnace with controlled atmosphere.
(2) quenching
In the salt bath furnace quenching, springs should be tied with wire evenly, or the spring is sheathed on the mandrel heating. When heated to ensure the surface oxidation and decarbonization of spring five. Salt bath should be carefully dna. Can also be in the controllable atmosphere box-type furnace heating, the heating temperature is 850±10 ℃, holding 10-15min, furnace oil quenching through.
(3) tempering
Quenching and tempering can be two times. The first correction correction of tempering, tempering temperature should generally be lower final tempering temperature20 ℃, holding 10-15min, released air cooling. Then the final tempering, in spring dimensions after correction, the spring is arranged in the tempering stereotypes fixture on final tempering. Tempering stereotypes fixture should ensure that the spring pitch and free length to meet the requirements. Tempering temperature 420±10 ℃, holding 30-35min, out of water.
(4) shot blasting
In order to improve spring fatigue strength for shot blasting. The projectile diameter 0.3-0.5mm. Using jets of compressed air, compressed air pressure of 0.4-0.5MPa; centrifuge projectile blasting, the line speed is 70m/s. By shot blasting treatment of the service life of the spring can improve more than doubled.
(图/文http://www.wxpdqp.com/)