Method for calculating deformation jump of flexible stretch-bending die for sectional material

Abstract

The invention discloses a deformation step difference calculation method of a profile flexible stretch-bending die, which comprises the following steps: step 1, based on the structure of the profile flexible stretch-bending die, determining the combination form of the profile flexible stretch-bending die, the combination form being a fan-shaped combination form or a parallel combination form; secondly, the radius and the envelope angle of the profile part to be formed are determined; thirdly, the number of flexible units of the flexible stretch-bending die is determined based on the structure of the flexible stretch-bending die for the sectional material; fourthly, a deformation order difference geometric equation of the fan-shaped combined type profile flexible stretch-bending die or the parallel combined type profile flexible stretch-bending die is established; and 5, based on the deformation jump geometric equation of the profile flexible stretch-bending die, the deformation jump of the profile flexible stretch-bending die in the corresponding combination form is calculated. According to the technical scheme, the problems that in the forming process of a profile flexible stretch-bending die, due to the fact that a contact area and a non-contact area exist between a part and the die, the part is formed discontinuously, deformation difference exists between the non-contact area and the part profile, and the forming quality of the part is directly affected are solved.

Description

Technical Field

[0001] The present invention relates to the field of but is not limited to the technical field of flexible bending dies for profiles, and in particular to a method for calculating the deformation step difference of a flexible bending dies for profiles. Background Art

[0002] The profile flexible stretch-bending die adopts a combination of discrete flexible units to replace the original integral die. By adjusting the position of each flexible unit, the die surface with different forming shapes can be obtained, which solves the problem of replacing the stretch-bending die every time the part type is changed during the traditional stretch-bending forming of parts. It greatly improves the manufacturing efficiency of the stretch-bending parts and reduces the manufacturing cost.

[0003] Due to the structural characteristics of the flexible bending die for profiles, there are contact areas and non-contact areas between the part and the die. Due to the discontinuous forming of the part, there is a deformation difference between the non-contact area and the part surface, which directly affects the forming quality of the part. Summary of the invention

[0004] Purpose of the present invention: In order to solve the above-mentioned technical problems, an embodiment of the present invention provides a method for calculating the deformation step difference of a flexible stretch-bending die for a profile, so as to solve the problem that during the forming process of the flexible stretch-bending die for the profile, the presence of a contact area and a non-contact area between the part and the die causes discontinuous forming of the part, resulting in a deformation difference between the non-contact area and the part surface, which directly affects the forming quality of the part.

[0005] Technical solution of the present invention: In a first aspect, an embodiment of the present invention provides a method for calculating the deformation step difference of a profile flexible drawing and bending die, which is characterized by comprising the following steps:

[0006] Step 1: Based on the structure of the profile flexible drawing and bending die, determine the combination form of the profile flexible drawing and bending die, the combination form is: fan-shaped combination or parallel combination;

[0007] Step 2, determining the radius and envelope angle of the profile part to be formed;

[0008] Step 3, based on the structure of the flexible bending die for the profile, determine the number of flexible units of the flexible bending die;

[0009] Step 4, establishing a deformation step difference geometric equation of a fan-shaped combined profile flexible drawing and bending die or a parallel combined profile flexible drawing and bending die;

[0010] Step 5: Based on the geometric equation of the deformation step difference of the profile flexible stretch-bending die, the deformation step difference of the profile flexible stretch-bending die of the corresponding combination form is calculated.

[0011] Optionally, in the deformation step difference calculation method of a profile flexible stretch-bending die as described above, the profile flexible stretch-bending die determined in step one is a fan-shaped combination type, and the overall structure of the fan-shaped combination profile flexible stretch-bending die is a fan-shaped ring structure, and a plurality of flexible units in the radial direction are evenly arranged along the circumference of the fan-shaped ring structure, and each flexible unit is used to move in the radial direction.

[0012] Optionally, in the deformation step difference calculation method of a profile flexible stretch-bending die as described above, the profile flexible stretch-bending die determined in step one is a fan-shaped combination type, and the overall structure of the fan-shaped combination profile flexible stretch-bending die is a fan-shaped ring structure, and a plurality of flexible units in the radial direction are evenly arranged along the circumference of the fan-shaped ring structure, and each flexible unit is used to move in the radial direction.

[0013] Optionally, in the above-mentioned method for calculating the deformation step difference of a profile flexible drawing and bending die, in the step 4, the deformation step difference geometric equation of the fan-shaped combined profile flexible drawing and bending die is established as follows:

[0014]

[0015] Among them, θ is the envelope angle of the profile part, R is the radius of the profile part, and n1 is the number of flexible units of the fan-shaped combined profile flexible stretch-bending die.

[0016] Optionally, in the method for calculating the deformation step difference of a flexible stretch-bending die for a profile as described above, the flexible stretch-bending die for the profile determined in step one is a parallel combination type, and multiple flexible units of the parallel combination flexible stretch-bending die for the profile are arranged vertically and parallel to each other, and each flexible unit moves along the vertical direction. δ(i) is used to represent the deformation step difference formed by the i-th flexible unit and the i+1-th flexible unit. The outermost flexible unit is marked as the first flexible unit, and the markings toward the center are increased successively until the flexible unit at the center is obtained, and the flexible unit at the center is marked as (n+1) / 2.

[0017] Optionally, in the deformation step difference calculation method of a profile flexible stretch-bending die as described above, the deformation step difference of the parallel combined profile flexible stretch-bending die can be divided into the deformation step difference generated by the first flexible unit and the second flexible unit and the deformation step difference generated between other adjacent flexible units.

[0018] Optionally, in the above-mentioned method for calculating the deformation step difference of a flexible drawing and bending die for a profile, in the step 4, the deformation step difference generated by the first flexible unit and the second flexible unit of the parallel combined profile flexible drawing and bending die is δ2(1), and the deformation step difference geometric equation of the parallel combined profile flexible drawing and bending die is established as:

[0019] i=1,

[0020]

[0021] Among them, θ is the envelope angle of the profile part, R is the radius of the profile part, and n2 is the number of flexible units of the parallel combined profile flexible stretch-bending die.

[0022] Optionally, in the method for calculating the deformation step difference of a flexible stretch-bending die for a profile as described above, it is characterized in that, in the parallel combination flexible stretch-bending die for a profile, the deformation step difference generated between other adjacent flexible units except the deformation step difference generated between the first flexible unit and the second flexible unit is δ2(i), and the deformation step difference gradually decreases from the outside to the center, and at this time the value of i is i≥2.

[0023] Optionally, in the above-mentioned method for calculating the deformation step difference of a flexible drawing and bending die for a profile, in the step 4, for the deformation step difference generated between other adjacent flexible units of the parallel modular flexible drawing and bending die for a profile, a deformation step difference geometric equation of the parallel modular flexible drawing and bending die for a profile is established as follows:

[0024] When i≥2,

[0025]

[0026] Among them, θ is the envelope angle of the profile part, R is the radius of the profile part, and n2 is the number of flexible units of the parallel combined profile flexible stretch-bending die.

[0027] In a second aspect, an embodiment of the present invention further provides a computer-readable storage medium, characterized in that it includes: a memory and a processor;

[0028] The memory is configured to store executable instructions;

[0029] The processor is specifically configured to implement the deformation step difference calculation method of the profile flexible stretch-bending die as described in any one of the above items when executing the executable instructions stored in the memory.

[0030] The beneficial effects of the present invention: In view of the problems that the current deformation step difference of flexible stretch-bending dies for profiles lacks a positive calculation basis, relies on engineering design experience, has a long design cycle, and has uncontrollable forming accuracy, the embodiment of the present invention proposes a deformation step difference calculation method for flexible stretch-bending dies for profiles. By determining two combination forms of flexible stretch-bending dies, based on a given profile part radius, envelope angle, and the number of flexible units of the flexible stretch-bending dies, a deformation step difference geometric equation of the flexible stretch-bending dies for profiles under the two combination forms is established. The deformation step difference of the profile manufactured based on the flexible stretch-bending dies is calculated through the geometric equation, which ensures the controllability of the profile forming accuracy and reduces engineering trial and error. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0032] Figure 1 A schematic flow chart of a method for calculating the deformation step difference of a profile flexible stretch-bending die provided in an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of a fan-shaped combined profile flexible stretch-bending die provided in an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of a parallel combined profile flexible stretch-bending die provided in an embodiment of the present invention;

[0035] Figure 4 A curve diagram showing the variation of the deformation step difference of the profile flexible drawing and bending die in the fan-shaped combination form with the number of flexible units in the embodiment of the present invention;

[0036] Figure 5 A curve diagram showing the variation of the deformation step difference of the flexible bending die for a profile in a parallel combination form with the number of flexible units in an embodiment of the present invention;

[0037] Figure 6 A deformation step difference distribution curve of each adjacent two flexible units of a profile flexible stretch-bending die based on a parallel combination of 27 groups of flexible units provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0039] The above background technology has already explained the advantages of flexible stretch-bending dies for profiles in the stretch-bending forming process. However, due to the presence of contact areas and non-contact areas between the part and the die, the part is discontinuously formed, resulting in a deformation difference between the non-contact area and the part surface, which directly affects the forming quality of the part.

[0040] In response to the above problems, the designers of the present invention considered calculating and determining the deformation step difference distribution of the multi-point flexible stretch-bending die to ensure that the deformation difference between the non-contact area and the theoretical part profile does not exceed the deformation step difference requirement. At present, the deformation step difference of the profile flexible stretch-bending die lacks positive design theoretical support. It is mostly based on the experience of designers and is verified and corrected through later experimental trial and error methods. The work efficiency is low, parts are wasted a lot, and the forming accuracy is uncontrollable. In order to positively evaluate the deformation step difference of the profile flexible stretch-bending die and improve the part forming accuracy, the present invention proposes a deformation step difference calculation method for the profile flexible stretch-bending die.

[0041] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0042] Figure 1 A schematic diagram of a method for calculating the deformation step difference of a profile flexible bending die provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the deformation step difference calculation method of the profile flexible bending die provided in the embodiment of the present invention includes the following steps:

[0043] Step 1: Determine the combination form of the profile flexible bending die: fan-shaped combination and parallel combination;

[0044] Step 2, determine the radius and envelope angle of the profile parts;

[0045] Step 3, determining the number of flexible units of the flexible stretch-bending die;

[0046] Step 4: Establish the geometric equations of deformation step difference of the flexible bending die for profiles under fan-shaped combination and parallel combination respectively.

[0047] Step 5: Based on the geometric equation of the deformation step difference of the profile flexible drawing and bending die, calculate the deformation step difference of the profile flexible drawing and bending die under the two combination forms.

[0048] In one implementation of the embodiment of the present invention, the flexible bending die determined in step 1 is a fan-shaped combination type, such as Figure 2 The figure is a schematic diagram of a fan-shaped combined profile flexible drawing and bending die provided by an embodiment of the present invention. The overall structure of the fan-shaped combined profile flexible drawing and bending die in this implementation is a fan-shaped ring structure, and a plurality of flexible units in the radial direction are evenly arranged along the circumference of the fan-shaped ring structure, and each flexible unit is used to move in the radial direction.

[0049] In this implementation, the deformation step difference geometric equation of the fan-shaped combined profile flexible bending die is established in step 4 as follows:

[0050]

[0051] Where θ is the envelope angle of the profile part, R is the radius of the profile part, and n1 fan-shaped combination is the number of flexible units of the profile flexible stretch-bending die.

[0052] In another implementation of the embodiment of the present invention, the profile flexible bending die determined in step 1 is a fan-shaped combination type, such as Figure 3 The figure shows a schematic diagram of a parallel modular profile flexible bending die in an embodiment of the present invention. In this implementation, multiple flexible units of the parallel modular profile flexible bending die are arranged vertically and parallel to each other, and each flexible unit moves in the vertical direction. δ(i) represents the deformation step difference between the i-th flexible unit and the i+1-th flexible unit. The outermost flexible unit is marked as the first flexible unit, and the marks toward the center are increased successively until the flexible unit at the center is obtained. The flexible unit at the center is marked as (n+1) / 2.

[0053] It should be noted that in this implementation, there are two situations for the parallel combined material flexible stretch-bending die, namely: the deformation step difference can be divided into the deformation step difference generated by the first flexible unit and the second flexible unit, and the deformation step difference generated between other adjacent flexible units.

[0054] For the first case mentioned above, that is, the deformation step difference between the first flexible unit and the second flexible unit of the parallel modular profile flexible stretch-bending die is δ2(1), the deformation step difference geometric equation of the parallel modular profile flexible stretch-bending die is established as:

[0055] i=1,

[0056]

[0057] Among them, θ is the envelope angle of the profile part, R is the radius of the profile part, and n2 is the number of flexible units of the parallel combined profile flexible stretch-bending die.

[0058] For the second case mentioned above, that is, the deformation step difference between other adjacent flexible units except the deformation step difference between the first flexible unit and the second flexible unit is δ2(i), and the deformation step difference gradually decreases from the outside to the center. At this time, the value of i is i≥2. The deformation step difference geometric equation of the parallel combined profile flexible stretch bending die is established as:

[0059] When i≥2,

[0060]

[0061] Among them, θ is the envelope angle of the profile part, R is the radius of the profile part, and n2 is the number of flexible units of the parallel combined profile flexible stretch-bending die.

[0062] Based on the deformation step difference calculation method of the profile flexible stretch-bending die provided in the above embodiment of the present invention, the embodiment of the present invention further provides a computer-readable storage medium, including: a memory and a processor;

[0063] Wherein, the memory is configured to store executable instructions;

[0064] The processor is specifically configured to implement the deformation step difference calculation method of the profile flexible stretch-bending die provided in any of the above embodiments when executing the executable instructions stored in the memory.

[0065] In view of the problems that the current deformation step difference of flexible stretch-bending dies for profiles lacks a positive calculation basis, relies on engineering design experience, has a long design cycle, and has uncontrollable forming accuracy, the embodiment of the present invention proposes a deformation step difference calculation method for flexible stretch-bending dies for profiles. By determining two combination forms of flexible stretch-bending dies, based on a given profile part radius, an envelope angle, and the number of flexible units of the flexible stretch-bending dies, a deformation step difference geometric equation of the flexible stretch-bending dies for profiles under the two combination forms is established. The deformation step difference of the profile manufactured based on the flexible stretch-bending dies is calculated through the geometric equation, which ensures the controllability of the profile forming accuracy and reduces engineering trial and error

[0066] The following is a schematic illustration of an implementation of the method for calculating the deformation step difference of a profile flexible stretch-bending die provided in an embodiment of the present invention using an application example.

[0067] Application Examples

[0068] Taking the part radius as 1762mm and the part envelope angle as 33°, the geometric equation of deformation step difference of the fan-shaped combined profile flexible bending die is calculated as:

[0069]

[0070] The deformation step difference of the fan-shaped combined profile flexible bending die can be obtained as the number of flexible units n1 changes, as shown in Figure 4 As shown, it is a curve diagram showing the deformation step difference of the profile flexible stretch-bending die in the fan-shaped combination form as the number of flexible units changes in the embodiment of the present invention.

[0071] The calculated geometric equation of deformation step difference of parallel combined profile flexible bending die is:

[0072] When i=1,

[0073]

[0074] When i≥2,

[0075]

[0076] It is calculated that the deformation step difference between the outermost flexible unit and the adjacent flexible unit of the parallel combined profile flexible stretch-bending die changes with the number of flexible units n2, as shown in Figure 5 As shown in FIG. 1 , it is a curve diagram of the deformation step difference of the parallel combination profile flexible drawing and bending die according to the embodiment of the present invention as the number of flexible units changes; further, when the number of flexible units is 27, the deformation step difference between each flexible unit of the parallel combination profile flexible drawing and bending die is calculated, as shown in FIG. Figure 6 As shown, it is a deformation step difference distribution curve diagram of each adjacent two flexible units of the profile flexible stretch-bending die based on the parallel combination of 27 groups of flexible units provided in an embodiment of the present invention.

[0077] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A method for calculating the deformation step difference of a profile flexible drawing and bending die, characterized in that: The steps include: Step 1: Based on the structure of the profile flexible drawing and bending die, determine the combination form of the profile flexible drawing and bending die, the combination form is: fan-shaped combination or parallel combination; Step 2, determining the radius and envelope angle of the profile part to be formed; Step 3, based on the structure of the flexible bending die for the profile, determine the number of flexible units of the flexible bending die; Step 4, establishing a deformation step difference geometric equation of a fan-shaped combined profile flexible drawing and bending die or a parallel combined profile flexible drawing and bending die; Step 5: Based on the geometric equation of the deformation step difference of the profile flexible stretch-bending die, the deformation step difference of the profile flexible stretch-bending die of the corresponding combination form is calculated.

2. The method for calculating the deformation step difference of a profile flexible drawing and bending die according to claim 1 is characterized in that: The profile flexible stretch-bending die determined in step one is a fan-shaped combination type, and the overall structure of the fan-shaped combination profile flexible stretch-bending die is a fan-shaped ring structure, on which a plurality of flexible units in the radial direction are evenly arranged along the circumference, and each flexible unit is used to move in the radial direction.

3. The method for calculating the deformation step difference of a profile flexible drawing and bending die according to claim 2 is characterized in that: In the step 4, the deformation step difference geometric equation of the fan-shaped combined profile flexible bending die is established as: Among them, θ is the envelope angle of the profile part, R is the radius of the profile part, and n1 is the number of flexible units of the fan-shaped combined profile flexible stretch-bending die.

4. The method for calculating the deformation step difference of a profile flexible drawing and bending die according to claim 1 is characterized in that: The flexible stretch-bending die for profiles determined in the step one is a parallel combination type, and the multiple flexible units of the parallel combination type flexible stretch-bending die for profiles are arranged vertically and parallel to each other, and each flexible unit moves along the vertical direction. δ(i) represents the deformation step difference formed by the i-th flexible unit and the i+1-th flexible unit. The outermost flexible unit is marked as the first flexible unit, and the marking increases gradually toward the center until the flexible unit at the center is obtained. The flexible unit at the center is marked as (n+1) / 2.

5. The method for calculating the deformation step difference of a profile flexible drawing and bending die according to claim 4 is characterized in that: The deformation step difference of the parallel combined profile flexible stretch-bending die can be divided into the deformation step difference generated by the first flexible unit and the second flexible unit and the deformation step difference generated between other adjacent flexible units.

6. The method for calculating the deformation step difference of a profile flexible drawing and bending die according to claim 5 is characterized in that: In the step 4, the deformation step difference between the first flexible unit and the second flexible unit of the parallel modular profile flexible drawing and bending die is δ2(1), and the deformation step difference geometric equation of the parallel modular profile flexible drawing and bending die is established as: i＝1, Among them, θ is the envelope angle of the profile part, R is the radius of the profile part, and n2 is the number of flexible units of the parallel combined profile flexible stretch-bending die.

7. The method for calculating the deformation step difference of a profile flexible drawing and bending die according to claim 4 is characterized in that: The parallel combined profile flexible stretch-bending die has a deformation step difference of δ2(i) between other adjacent flexible units except the deformation step difference between the first flexible unit and the second flexible unit, and the deformation step difference gradually decreases from the outside to the center. At this time, the value of i is i≥2.

8. The method for calculating the deformation step difference of a profile flexible drawing and bending die according to claim 7, characterized in that: In the step 4, for the deformation step difference generated between other adjacent flexible units of the parallel modular profile flexible stretch-bending die, the deformation step difference geometric equation of the parallel modular profile flexible stretch-bending die is established as follows: When i≥2, Among them, θ is the envelope angle of the profile part, R is the radius of the profile part, and n2 is the number of flexible units of the parallel combined profile flexible stretch-bending die.

9. A computer-readable storage medium, characterized in that: include: Memory and processor; Wherein, the memory is configured to store executable instructions; The processor is specifically configured to implement the deformation step difference calculation method of the profile flexible stretch-bending die according to any one of claims 1 to 8 when executing the executable instructions stored in the memory.

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