The formulation of mold gap and those factors have a relationship, the first is material, the second is the thickness, there is a heat treatment after the material hardness requirements.The relationship between bending gap and material of ignition gun barrel

In metallic materials, there is enough force between the atoms to resist the action of gravity, so that without any other external force, metal objects will retain their own shape and size.

Ignition barrel elastic deformation - when an object is subjected to an external force, its shape and size will change.If action is at the external force of the body after removing, the deformation that causes by external force disappears subsequently, the body can restore his original shape and size completely, such deformation is called elastic deformation.

Plastic deformation ---- if the external force applied on the object is removed, the object cannot completely restore its original shape and size, such deformation is called plastic deformation.Both plastic deformation and elastic deformation are carried out under the condition that the deformed body is not destroyed (i.e. continuity is not destroyed).

The plastic deformation capacity of a material is usually expressed in terms of plasticity.

Plasticity ---- the ability of a solid material to deform permanently under external forces without destroying its integrity.Metal plastic is not fixed, there are many factors which can affect it, in addition to the metal itself lattice type, internal factors such as chemical composition and microstructure, deformation of the external factors - way (mechanical factors of the stress state and strain state) and deformation conditions (physical factors namely, deformation temperature and deformation speed) has a very big impact.The relationship between bending gap and material of ignition gun barrel

(1) influence of gap on section quality of ningbo textile machinery accessories

When the gap is reasonable, the cracks on the upper and lower edges will coincide with each other in the blanking process. At this time, the section of the product shot out has a certain inclination, but it is relatively flat, smooth and clean, with small burr and small blanking force.

(2) influence of clearance on dimensional accuracy

Precision stamping parts relative to the deviation between the size of the mold, mainly because of the process of sheet metal blanking with extrusion deformation, bending of fiber elongation and arch elastic deformation, disappeared in part from the mould, caused by the deviation value may be positive, also may be negative, the main factors affecting the deviation is mold clearance, parts of material properties, shape and size are also has certain influence.

(3) impact of clearance hedge cutting force

With the reduction of die clearance, blanking force increases, because the clearance is small, bending moment M decreases, the tensile stress of the material decreases, but the compressive stress increases.The blanking force decreases with increasing the clearance, but continues to increase the clearance value. As the cracks generated from the cutting edge of the convex and concave die do not coincide, the blanking force decreases slowly.

(4) influence of gap on mold life: customize the lighter windshield

The life of die is usually expressed by the number of times of die cutting to ensure the qualified products.

But the gap is too big, because the bending moment and the tensile stress increase, the edge of the mold is damaged. In general, when the gap is 10%-15% of the material thickness, the wear is the least, and the life of the mold is relatively high.When the gap is small, the falling parts get stuck in the hole of the die, which may cause the die cracking.

It can be seen from the above phenomenon that the phenomenon is still obvious, so as long as the thickness and strength of the material are combined, the best blanking clearance can be determined to get the experience value. Now this experience value has been summed up perfectly, but for some new materials, if you are not sure, you can also summarize it yourself, generally speaking:

In fact, there is no specific calculation formula for the value of the gap of the shell of the lighter nozzle (there are only some simple empirical formulas, which are theoretical but not suitable for practical application)., the reasonable clearance value is related to material thickness, material and parts accuracy or other requirements (such as die life, parts size, section structure and quality), usually through the mold manual table.