Regarding the bending factor, what is the formula for calculating the bending factor

During the bending deformation process, the material on the inside of the fillet is compressed and the outside material is stretched, while the material that retains its original length is distributed in an arc (dotted line in the figure). The position of this arc is the mechanical neutral line of the sheet metal, which is the line used to calculate the length. It is impossible to exceed 1 to 2 places of the geometry of the sheet thickness.

The coefficient k is the coefficient for calculating the position of the neutral line of the material.

In this way, k determines the coefficient for calculating the length of the structure of the bending fillet part (any feature that can be obtained with this shape). The range is 0-1; The default value is. The formula for calculating the bend length is as follows:

Result length = 2*pi* (bend radius + k * thickness) * (bend wrap angle 360).

It can be seen that the length with bends will be different with different settings of the k coefficient, and under this condition, the same coefficient will be used for the calculation of all relevant parts of the model; In Bend Table mode, it is possible to use different calculation factors for different parameters, which should be more accurate and reasonable.

Depending on the material and the specific sheet metal design rules, the k-factor can be changed to the appropriate value so that a more accurate length can be obtained later. The k-factor is material-dependent and also depends on the ratio of the sheet thickness to the bend radius. For steel, the customary parameters in China are shown in Table 10-1.

For the default case of inventor, the bending radius thickness = and k = is also quite consistent with the design habits of our country.

Table 10-1 k coefficient table.

Bend radius thickness.

k internal and external dimensions plus factor. It is used in the bending experience formula, the inner size is the length of the fold without considering the thickness of the material, the outer size is the thickness of the material, and the coefficient is the correction value considered when bending, which is completely empirical. It should only be used in rough situations.

Regarding the determination of the bending radius, if you are doing the design, of course, it is up to you to determine it, but you have to consider the assembly relationship, the appearance of the beauty, and the manufacturing process, etc. Generally, the inner side of the bending is thick, in line with the basic sheet metal rules

The bending coefficient is calculated as BA=P(R+KT)A 180. where ba = bending coefficient r = inner bending radius k = k factor, i.e. t tt = material thickness t = distance from the inner surface to the neutral surface a = bending angle through the angle p of the bending material p, i.e. pi =. The bending coefficient is the plate.

After bending, the length and material to be stretched are different, the thickness of the plate is different, the bending dies used are different, and the bending coefficient is also different.

The role of the bend factor

When you get the product parts drawings provided by the customer and start designing the mold drawings, the first step is to turn the bending structure into a flat structure step by step in a reverse way, and then the flat structure part is stamped by punching, and the bending structure is designed on the basis of the punched structure, so as to achieve the bending structure required by the customer.

As a mold designer, of course, the design of the mold is not only to consider the structure required by the customer's drawings, but also to achieve the dimensional tolerances required by the customer's drawings.

Requirements, that is, accuracy must also meet the needs of customers. The most difficult thing to guarantee and the most challenging thing for the mold designer here is the accuracy of the dimensions related to stamping and bending. Finish.

The formula for the bending coefficient is: BA=P(R+KT)A 180. Where:

ba = bending coefficient r = inner bending radius k = k - factor, i.e. t tt = material thickness t = distance from the inner surface to the neutral surface a = bending angle (angle through the bent material) p i.e. pi =.

Definition of the bend factorThe bending coefficient is the plate.

The length that is stretched after bending is different, the thickness of the plate is different, the bending mold used is different, and the bending coefficient is different, and the bending coefficient is the data that has been summarized by experienced mold designers based on years of design experience.

Later mold designers can directly apply the calculation formula to obtain the flat plate size of the bending structure. Based on this, the stamping bending coefficient is summarized for the mold designer to calculate the size, and can be used by any mold designer.

Formula: Size = Outside length of the straight edge + Outside length of the other straight edge - Bend deduction.

l=coefficient t) (90).

L: Developed length

r: The inner radius of the bend

y-factor: A constant determined by the position of the neurtal bend line, the default value of which is the so-called "bend centerline"). The default value can be set in config: initial bend factor

In the actual sheet metal design, the commonly used sheet metal flattening calculation formula is mainly based on the k coefficient, and the range is 0 1, which indicates the degree of resistance of the material to be stretched when bending.

What it does:

When you get the product parts drawings provided by the customer and start designing the mold drawings, the first step is to turn the bending structure into a flat structure step by step in a reverse way, and then the flat structure part is stamped by punching, and the bending structure is designed on the basis of the punched structure, so as to achieve the bending structure required by the customer.

As a mold designer, of course, the design of the mold is not only to consider the structure required by the customer's drawings, but also to meet the dimensional tolerance requirements required by the customer's drawings, that is, the accuracy must also meet the customer's needs. Here, the most difficult to ensure and the most challenging thing for mold designers is the accuracy of the relevant dimensions of stamping and bending.

There are many ways to bend the factor, but you should be referring to the "bend deduction method". There are also k-factor method, Y-factor method, deduct plate thickness method, etc. The more common one is the bending deduction method.

Dimension = Outside length of the straight edge + Outside length of the other straight edge - Bend deduction.

Note: 1. The length of the outer corner of the straight edge refers to the distance between the intersection points of the two straight edges, not the tangent point at the bending fillet.

2. The number of bending deductions is different according to the size of the tool with different V-groove sizes. Generally, V16=, the larger the size of the V-groove, the easier it is to form, but the minimum foldable edge size is larger. The deduction can be consulted with the knife ** dealer.

If you say 100 is the outside length of the straight edge, choose the V18 tool, then:

Length = 100+.

Answer: The bending coefficient is calculated as follows: l=coefficient t) (90)l: developed length of sheet metal r: inner radius of the bend t: thickness of the material.

Bend angle.

Question: How much is the plate thick 5 mm folded 90 degrees, how big is the groove, and how long are you?

The bending coefficient is calculated as BA=P(R+KT)A 180.

Bend Factor Concept:

The bending coefficient is the length of the plate that is stretched after bending, the material is different, the thickness of the plate is different, the bending mold used is different, and the bending coefficient is also different. The bending coefficient is the data-based thing that has been summarized by experienced mold designers based on years of design experience and repeated verification.

Algorithm for bending coefficients: wheel permeability.

When the sheet metal bending angle is 135 degrees, the bending coefficient can be subtracted by multiple times the thickness of the wax material. For example, if the material is 1mm iron plate, the bending angle is 135 degrees, and the bending size is 100 and 50 respectively, then the calculation is:

100+。Other sheet metal thicknesses can also be calculated using this method. Only suitable for 135 degrees, other angles are not available.

Hello bending coefficient answer: the formula of the old one is: ba=p(r+kt)a 180, wherein: ba=bending coefficient r=inner bending radius k=k-factor, that is, t tt = material thickness t = inner surface noisy letter surface to the neutral surface of the distance from the lifting wheel a = bending angle (the angle of the bent material) p that is, pi =