Creation of burrs:
In die casting factory production activities, there is no method to completely solve the die casting burr generation, burr is the whole die casting processing service industry objective existence of the inevitable result. The burr produces the reason mainly has the mold clearance fit, die casting machine of various parameters of the setting, mold pouring row system design irrationality, even if the above factors have not occurred, the new mold first produced parts without burr burrs, with the increase of die casting die times.
Die-cast burr
The accumulation of mold release agent residue in the mold, mold parts of the movement of the wear and tear, etc., will lead to die casting began to produce small burr burrs, will eventually lead to burrs become larger and thicker, in order to remove the burr need to repeatedly wash the mold, weld with the mold, which will greatly affect the service life of the mold, the production of a period of time due to the friction of the active parts of the gap becomes bigger, the parting position, the position of the top rod began to appear fly edge burr, die casting Temperature changes, pressure changes will also cause burrs.
Containment of burrs
In terms of burr generation, it can be solved by starting from the following aspects:
The design of the mold in the design of die-casting mold, not only to consider the strength of the mold, but also to consider the deformation resistance of the material. Die casting mold design in the main consideration of the following aspects:
1.The strength and stiffness of the mold and the fit clearance;
2.The structure of the mold to avoid the emergence of rigidity is quite weak parts, if there is such a structure will be deformed in the production process, resulting in a larger gap to produce burrs, more will affect the service life of the mold;
3.Mold design to ensure that as far as possible to ensure that the product gap direction, control mold because of the above two problems produce burrs, in order to facilitate the burr line into the use of tools to better deal with the burr off.
Die casting process, such as exhaust is not smooth, in high-pressure casting production will be in the exhaust position instantaneous pressure increase to form sonic boom, will mold open a gap, will run liquid or the formation of plate burr, die casting production to meet the internal quality of the product under the premise of avoiding the use of higher speeds and pressures, die casting production needs to be cleaned up at regular intervals of the mold release agent produces the dirt, to avoid the accumulation of dirt in the mold parting surface formation of the plate to the formation of the burr Leave space.
Removal of burrs
Manual or mechanical removal: hand file, pneumatic file, belt sander and grinding head and other tools for manual deburring. This method is suitable for simple die castings, but for castings with complex shapes, variable curves, deep holes or cross holes, the efficiency is low, and it is easy to remove the phenomenon of incomplete removal, and manual removal depends on the proficiency as well as responsibility.
Manual deburring machine deburring
Trimming: Manufacturing trimming dies, using hydraulic presses or punching machines, to remove burrs in a single direction or fewer directions by trimming, but only a small part of the burrs can be removed for complex shaped castings.
Grinding deburring: the use of grinding machines + abrasive grains for deburring is suitable for smaller sizes, larger quantities, higher strength products, and castings that are not suitable for manual deburring. Shot peening technology with rapid freezing: the use of shot peening technology combined with rapid freezing equipment for deburring, suitable for some specific requirements of the aluminum alloy die casting, equipment costs higher consumables.
Thermal Explosion Method: By introducing a flammable gas, the gas is instantly exploded under specific media and conditions, and the explosion energy is utilized to dissolve and remove the burr. This method is more costly and is usually applied to high precision parts.
Chemical reaction: Automatically and selectively removes burrs from die castings using the principle of electrochemical reaction. Good for burrs smaller than 7 mm, but less effective for burrs inside the casting.
High-pressure water gun: the use of high-pressure water gun to water as a medium, the use of instantaneous impact to remove burrs and flying edges generated after processing, and at the same time to achieve the effect of cleaning.
Ultrasonic: Utilizing the vibration principle of ultrasonic waves and high pressure to remove burrs, the effect on tiny burrs is remarkable, suitable for detailed processing.
All of the above methods can be applied to die casting burr removal process, the actual production should be selected to suit the casting characteristics and requirements of the method of treatment.
Concluding remarks
In the die casting burr burr removal process, different ways and means to bring different results, now the production of die casting parts, the choice of suitable methods to remove burrs need to consider whether to meet the manufacturers of the current situation, under the premise of customers can meet the requirements of the choice of consistency of a better risk of a lower cost advantage of the removal of burrs in the design of the product, the design of molds, the die casting process of the Adjustment of the following as much as possible to reduce the generation of burrs, burrs generated by the location of the expected judgment, to facilitate the effective handling of the post-process.
