Structural Processability of Heat-Treated Parts
DATE：2019/9/28 8:50:50 / READ： / SOURCE：This station
Structural processability of heat-treated parts
In the design process of mechanical parts, the structure, shape and size of the parts must be considered to be smoothly implemented in the subsequent heat treatment process without causing a large amount of waste or defective products (such as excessive deformation, warpage, tolerance, cracking, etc.). . To this end, the following aspects should be noted in the design:
1) The shape of the part should be such that the parts are as uniform and symmetrical as possible to reduce the distortion of the parts and to make the distortion regular.
2) The part should have sufficient stiffness to reduce distortion.
3) The cross-section and thickness of the part should be uniform, and the cross-section of the part should be avoided. If the design allows, the process hole or the process groove can be added, and the position and quantity can be reasonably distributed to reduce the stress concentration in the transition zone. Distortion, cracking tendency.
4) The parts should be kept as far as possible from sharp edges, edges, steps, and replaced with rounded corners.
5) Holes, grooves, keyways and deep ribs on the part should be minimized. If it is unavoidable, it should be made shallower to reduce stress concentration, local softening or quenching cracking.
6) When the inner hole is required to be hardened, the inner hole should be a through hole. There should be a certain distance between the hole and the hole or between the hole and the edge. If possible, the hole can be drilled horizontally at the bottom of the inner hole to improve the inner hole during quenching. Cooling conditions.
7) When the hollow structure parts need to be quenched, a vent hole must be provided.
8) When the tailor welded parts need to be quenched, no quenching is required at the welds to prevent cracking.
9) Parts with complex shapes and different requirements for different parts should be combined as much as possible. When it is possible to splicing a particularly slender, thin and long part structure, it should be spliced as much as possible to reduce the length, which is beneficial to improve the heat treatment process.
10) For the design of large and long pieces, the card loading and hanging for heat treatment should be considered.
11) The parts need to be inductively quenched, and holes or slots should be avoided as much as possible. Holes or slots that cannot be avoided, the edges of which must be chamfered. The keyway can be chamfered at the arc at both ends of the slot.
In the design process of mechanical parts, the structure, shape and size of the parts must be considered to be smoothly implemented in the subsequent heat treatment process without causing a large amount of waste or defective products (such as excessive deformation, warpage, tolerance, cracking, etc.). . To this end, the following aspects should be noted in the design:
1) The shape of the part should be such that the parts are as uniform and symmetrical as possible to reduce the distortion of the parts and to make the distortion regular.
2) The part should have sufficient stiffness to reduce distortion.
3) The cross-section and thickness of the part should be uniform, and the cross-section of the part should be avoided. If the design allows, the process hole or the process groove can be added, and the position and quantity can be reasonably distributed to reduce the stress concentration in the transition zone. Distortion, cracking tendency.
4) The parts should be kept as far as possible from sharp edges, edges, steps, and replaced with rounded corners.
5) Holes, grooves, keyways and deep ribs on the part should be minimized. If it is unavoidable, it should be made shallower to reduce stress concentration, local softening or quenching cracking.
6) When the inner hole is required to be hardened, the inner hole should be a through hole. There should be a certain distance between the hole and the hole or between the hole and the edge. If possible, the hole can be drilled horizontally at the bottom of the inner hole to improve the inner hole during quenching. Cooling conditions.
7) When the hollow structure parts need to be quenched, a vent hole must be provided.
8) When the tailor welded parts need to be quenched, no quenching is required at the welds to prevent cracking.
9) Parts with complex shapes and different requirements for different parts should be combined as much as possible. When it is possible to splicing a particularly slender, thin and long part structure, it should be spliced as much as possible to reduce the length, which is beneficial to improve the heat treatment process.
10) For the design of large and long pieces, the card loading and hanging for heat treatment should be considered.
11) The parts need to be inductively quenched, and holes or slots should be avoided as much as possible. Holes or slots that cannot be avoided, the edges of which must be chamfered. The keyway can be chamfered at the arc at both ends of the slot.
Author：admin