Study on the life of the carton printing slot machine blade
2021-07-08 14:05:36
Carton printing slotting machine, forming machine and various multi-functional joint machines such as printing die-cutting and slotting. It has the characteristics of high-quality teaching and compact structure, and is widely used by carton packaging enterprises. The grooving knife is one of the necessary tools, and its service life directly affects the quality of the slotting of the carton and the manufacturing cost. It is one of the problems that need to be improved in the quality management and cost management of similar enterprises.
In today's fierce competition in the market centered on quality and price, this issue is increasingly being concerned by the leaders of relevant enterprises, prompting enterprises to tap potential innovation, save money and increase efficiency, and take the road of intrinsic development. This article discusses some issues to improve the service life of slotting knives.
First, the existing problems of the slotting knife at home and abroad, its structural shape is basically similar.
The slotting knife includes two parts: an upper knife and a lower knife. The common upper knife has a curved knife and a curved serrated knife; the lower knife has a semicircular acute angle knife or a semicircular right angle knife, and a semicircular groove width ring. . The service life of the slotting knife depends on whether the quality of the cardboard slot meets the product standard. The quality of the groove is generally reduced with the wear of the cutting edge of the tool, which may cause burrs, burrs, chipping and scrap. When the product does not meet the standard, the slotting knife needs to be exchanged.
Although there are certain differences in the service life between imported and domestic slotting knives, there are some similar problems: First, the slotting knife (upper knife) can only be used once and has a short life; the second is the effect of sharpening the knife. Poor, the quality of the groove is unstable; the third is the poor wear resistance of the cutting edge, and some of the cutting edges are partially cracked; the fourth is the frequent addition of new knives, high expenditure and high production cost.
Second, the main reasons analysis (a) tool wear and cutting paper related to the work of the slotting knife, the ruler cuts the cardboard while the surface is subject to relative friction. In many paperboards, the amount of sand contained is 5% to 10% higher, and the sand particles have a sharp grinding effect relative to the cutting edge, so that the metal on the surface of the cutting edge gradually plastically deforms and fatigue wears off. The life of the tool decreases with increasing use time and the amount of sand (such as quartz sand) and impurities of the cut cardboard.
(2) The gap between the upper and lower knives after sharpening the knife is unreasonable, and the use of the product affects the quality of the product.
1 The form and extent of upper and lower knife wear. The upper working surface a is obviously worn within the range of about 10 mm above the cutting edge, and the cutting edge of the working surface b has a certain degree of wear, the two sharp-edged blades become dull, and the thickness between the two a faces becomes thin; the lower working face c is self-cutting There is also obvious wear in the range of about 10 mm below, and the cutting edge of the working surface d also has a certain degree of wear, the sharp corner knife or the right angle knife blade becomes dull, and the thickness between the c-face cutting edge and the corresponding end surface becomes thin.
2 Wear causes a change in the gap between the upper and lower cutting edges. Usually people pay more attention to the grinding of the working faces a, c, but less analysis of the resulting gap changes.
3 Ignore the corresponding change in the thickness of the groove width ring. The effect of the slotting knife after grinding is poor. This is because the thickness of the groove width retaining ring is fixed and the gap between the upper and lower cutting edges is unreasonable.
(3) The wear resistance of the tool and the hardness of the material and the heat treatment are related to the wear resistance and the hardness of the material and the nature, quantity, size and distribution of the hard spots in the structure. The higher the hardness, the more refined the carbides. The more uniform the distribution, the better the wear resistance.
Third, the method of improving life expectancy This article mentions some factors that are difficult to avoid objectively or the tool affects the life due to accidental bruises, which will not be discussed here. The practical way we have done through subjective efforts is to solve the problem of reuse of old knives and new knives, thus extending the service life of the grooving knives.
(1) Reasonable clearance and grinding of the old knife to ensure the effect of reuse.
1. Measure and classify the wear of the old upper knife. In order to unify the size, the grinding knife is standardized, the unnecessary cutting edge grinding loss is reduced, and all the old upper cutting tools are measured, recorded and classified for grinding.
2. Check and classify the cutting edge of the lower knife.
(2) It is preferable to have a good material and a high hardness of 1, to prevent abnormal cracks in the blade. The steel is forged to the shape of the desired tool, and the internal structure is tight and the quality of the crystal phase is improved, but it is required to avoid forging crevices during the forging process. In the heat treatment process, full consideration is given to avoiding defects such as quenching cracks.
2. Add a new knife and strictly check it according to the picture. Carton packaging companies generally add new grooving knives through outsourcing, and it is important to pay attention to the requirements of dimensional tolerances, materials, hardness, etc. as specified in the drawings.
In today's fierce competition in the market centered on quality and price, this issue is increasingly being concerned by the leaders of relevant enterprises, prompting enterprises to tap potential innovation, save money and increase efficiency, and take the road of intrinsic development. This article discusses some issues to improve the service life of slotting knives.
First, the existing problems of the slotting knife at home and abroad, its structural shape is basically similar.
The slotting knife includes two parts: an upper knife and a lower knife. The common upper knife has a curved knife and a curved serrated knife; the lower knife has a semicircular acute angle knife or a semicircular right angle knife, and a semicircular groove width ring. . The service life of the slotting knife depends on whether the quality of the cardboard slot meets the product standard. The quality of the groove is generally reduced with the wear of the cutting edge of the tool, which may cause burrs, burrs, chipping and scrap. When the product does not meet the standard, the slotting knife needs to be exchanged.
Although there are certain differences in the service life between imported and domestic slotting knives, there are some similar problems: First, the slotting knife (upper knife) can only be used once and has a short life; the second is the effect of sharpening the knife. Poor, the quality of the groove is unstable; the third is the poor wear resistance of the cutting edge, and some of the cutting edges are partially cracked; the fourth is the frequent addition of new knives, high expenditure and high production cost.
Second, the main reasons analysis (a) tool wear and cutting paper related to the work of the slotting knife, the ruler cuts the cardboard while the surface is subject to relative friction. In many paperboards, the amount of sand contained is 5% to 10% higher, and the sand particles have a sharp grinding effect relative to the cutting edge, so that the metal on the surface of the cutting edge gradually plastically deforms and fatigue wears off. The life of the tool decreases with increasing use time and the amount of sand (such as quartz sand) and impurities of the cut cardboard.
(2) The gap between the upper and lower knives after sharpening the knife is unreasonable, and the use of the product affects the quality of the product.
1 The form and extent of upper and lower knife wear. The upper working surface a is obviously worn within the range of about 10 mm above the cutting edge, and the cutting edge of the working surface b has a certain degree of wear, the two sharp-edged blades become dull, and the thickness between the two a faces becomes thin; the lower working face c is self-cutting There is also obvious wear in the range of about 10 mm below, and the cutting edge of the working surface d also has a certain degree of wear, the sharp corner knife or the right angle knife blade becomes dull, and the thickness between the c-face cutting edge and the corresponding end surface becomes thin.
2 Wear causes a change in the gap between the upper and lower cutting edges. Usually people pay more attention to the grinding of the working faces a, c, but less analysis of the resulting gap changes.
3 Ignore the corresponding change in the thickness of the groove width ring. The effect of the slotting knife after grinding is poor. This is because the thickness of the groove width retaining ring is fixed and the gap between the upper and lower cutting edges is unreasonable.
(3) The wear resistance of the tool and the hardness of the material and the heat treatment are related to the wear resistance and the hardness of the material and the nature, quantity, size and distribution of the hard spots in the structure. The higher the hardness, the more refined the carbides. The more uniform the distribution, the better the wear resistance.
Third, the method of improving life expectancy This article mentions some factors that are difficult to avoid objectively or the tool affects the life due to accidental bruises, which will not be discussed here. The practical way we have done through subjective efforts is to solve the problem of reuse of old knives and new knives, thus extending the service life of the grooving knives.
(1) Reasonable clearance and grinding of the old knife to ensure the effect of reuse.
1. Measure and classify the wear of the old upper knife. In order to unify the size, the grinding knife is standardized, the unnecessary cutting edge grinding loss is reduced, and all the old upper cutting tools are measured, recorded and classified for grinding.
2. Check and classify the cutting edge of the lower knife.
(2) It is preferable to have a good material and a high hardness of 1, to prevent abnormal cracks in the blade. The steel is forged to the shape of the desired tool, and the internal structure is tight and the quality of the crystal phase is improved, but it is required to avoid forging crevices during the forging process. In the heat treatment process, full consideration is given to avoiding defects such as quenching cracks.
2. Add a new knife and strictly check it according to the picture. Carton packaging companies generally add new grooving knives through outsourcing, and it is important to pay attention to the requirements of dimensional tolerances, materials, hardness, etc. as specified in the drawings.
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