Requirements of the hottest die cutting on blade p

2022-08-23
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Requirements of die cutting on blade performance (I)

with the increasing requirements of people for commodity packaging, all printing and packaging enterprises are trying to improve their die cutting technology and equipment level. This paper lists the process of die cutting to continue the production of "graphene +" action plate and many requirements for blades in the process of die cutting, hoping to help printing and packaging enterprises judge and solve the problem of poor die cutting

I. requirements for blades in the process of die-cutting plate making

1. Easy to bend and form

blades are easy to bend and form. On the one hand, they can meet the requirements of modern society for high-end packaging of various shapes, on the other hand, they can shorten the plate making time of die-cutting slips and improve work efficiency

the main factors affecting the bending performance of die-cutting knives are:

(1) material hardness

the type of blade is determined according to the material hardness and 10000 of the blade. The harder the material is, the harder it is to bend. For example, vertex is harder to bend than qinflex

(2) decarburization treatment

materials treated with decarburization are easier to bend than those without decarburization. For example, qinflex of 0.71mm can be bent to an acute angle of 150 degrees (r=0.3mm), while the indentation line is bent and easy to break. Because the decarburization layer on the surface is removed in a large area on the edge of Gaofeng knife, cracks appear earlier than on the blade

(3) composition and structure of materials

excellent materials will not break easily when bending, and materials produced by different companies will see obvious differences when bending

(4) bending machine mold

a well-designed mold can avoid incorrect pressure on blade deformation

(5) thickness and height of blade

the thicker the blade, the harder it is to bend; The higher the blade, the greater the force required to bend. For products with extremely precise and complex shapes, a 0.53mm thin knife can bring a lot of convenience

(6) blade plasticity

the blade should have a certain bending plasticity. If the plasticity is too large, the blade will be like a spring. If it is too small, it will be like plasticine, and it will deform under a little pressure

good plasticity should be developed. Three different upper molds are developed. The blade rebounds slightly after bending into a certain shape

2. It is easy to install the plate

when installing the blade into the slotted template, it should be moderately tight, and the blade can be embedded by gently tapping with the plate making hammer. The following factors will lead to difficulties in installing the plate:

(1) the thickness of the blade

the thickness of the blade is usually controlled within a certain tolerance range, and exceeding the tolerance range will cause over tightening or over loosening

(2) the width of the sawing seam (cutter slot)

the width of the sawing seam should be strictly controlled within the tolerance range, and it should be straight enough. If there is a small distance curve fluctuation, it will be difficult to install the knife

(3) chamfer of blade back

when the chamfered blade is placed in the template, it will not be trapped by the prominent edges and corners

a new concept TB blade has come out. The blade can be easily installed into the template through the blade back with an inclined plane

3. The blade joint is well docked

a good piece joint/lap treatment can avoid continuous cutting or popping at the joint

(1 flat butt

the die of the cutting machine should have precise perpendicularity, which can ensure that each cutting end obtained is perpendicular to the blade.

(2 lap treatment

because the blade has different blade types, such as 52 degrees at the center, 42 degrees at the top, peak, side peak, etc., the die of the corner cutting machine must be strictly matched with the blade being cut, and the gap of the die will affect the beginning and boom of the cutting edge.

(3) the boom of the blade

at the blade edge, if the material is not ideal, or the tempering of the blade after quenching is not good, there will be a boom phenomenon.

II. Requirements for the die-cutting blade in the die-cutting process

1. Uniform cutting

users hope that the die-cutting plate can cut the die-cutting material evenly after installation. What is the reason why the die-cutting plate can not cut the die-cutting material evenly?

(1) Uneven blade height

the blade has height tolerance during production. The size of the tolerance and whether it is controlled within the tolerance will affect the uniformity of the blade height, and the enterprise will cause the high point to be cut off. If you pressurize in this case, the high point blade will be damaged and no longer sharp, and the service life of the high point position will be greatly reduced. Especially for large-area die-cutting plates, this defect is particularly obvious

(2) the straightness tolerance of the blade is too large

if the straightness tolerance of the blade is too large, Su Zhe plastic granulator industry should constantly improve the technical level. The actual straightness exceeds the tolerance. When the part where the blade protrudes forward is cut, other parts cannot be cut at the same time, and pressurization will cause the high point to become blunt. This phenomenon is particularly obvious when the blade is used in large sections

(3) the sharpness of the blade is different at different positions

although the height and straightness of the blade meet the requirements, if the blade at a certain position is not sharp enough, it will also make the Department cut the materials to be die cut

(4) corner contraction

the metal material will compress or stretch under the force, and the blade is no exception. When the blade is in bending, the inner side will be squeezed, and there is no place to extend, resulting in a large amount of warm tension on the outer side, resulting in] contraction in the width direction of the blade at the corner, causing the blade at this part to be shorter than the blade at two times

the problem can be solved by grinding the inner side of the blade bending part to materials slightly less than half the thickness of the blade

the shrinkage of peak knife is smaller than that of low peak knife. (to be continued)

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