Magnetorheological elastomer auxiliary rigidity changing method for working profile of head body of multi-point stretch bending die for profile

Abstract

The invention discloses a magnetorheological elastomer auxiliary rigidity changing method for a working profile of a head body of a multi-point stretch bending die for a profile, and relates to the technical field of dies. Comprising a vertical frame, one side of the vertical frame is movably connected with a threaded shaft, the top of the threaded shaft extends out of the vertical frame, the threaded shaft is sleeved with a sliding block, after the sliding block vertically moves on a movable shaft, the sliding block is fixed through a round nut, a first positioning disc is fixed to the top end of the threaded shaft, and after the first positioning disc is rotated, the threaded shaft is fixed through a first screw. By adjusting the magnetic field and changing the rigidity of the magnetorheological elastomer, the overall rigidity characteristic of the working face of the die head body is changed, so that the working face of the die head body can regionally and individually adjust the rigidity attribute of the working face of the multi-point stretch bending system die according to stretch bending forming deformation conditions; the rigidity of the working surface of the die head body is realized, and the deformation force applied to a parison is controlled.

Description

Technical Field

[0001] The invention relates to the technical field of moulds, in particular to a method for changing the stiffness of a working profile of a profile multi-point drawing and bending mould head with the assistance of a magnetorheological elastomer. Background Art

[0002] With the rapid development of high-speed rail, automobile, aerospace and construction industries, a large number of profile components are widely used in high-speed rail train head frames, automobile bodies, aerospace and construction fields. In the multi-point stretch-bending process of profiles, the rigidity of the die head working surface affects the force of the die on the blank, and its material and rigidity properties affect key technologies such as the multi-point stretch-bending die, the coupling dynamic action of the blank and the structural load distribution characteristics.

[0003] The rigidity of the magnetorheological elastomer on the working surface of the die head body is the main characteristic parameter of the multi-point stretch-bending forming system, which directly characterizes the force characteristics of the die head body on the parison. When the rigidity of the working surface of the die head body is high, it cannot overcome the deformation force exerted on the parison by the multi-point mold segmentation and produce crease defects. When the rigidity of the working surface of the die head body is low, the restraint ability of the mold on the parison is reduced and the forming wear is increased, which may cause insufficient deformation of the part. In practical applications, the rigidity of the working surface of the die head body needs to be reasonably controlled for different profile materials, cross-sectional shapes, deformation requirements, etc.

[0004] The existing technology mainly designs the multi-point bending die profile by designing the multi-point bending die head body configuration profile, the parison cross-sectional shape, the product length and deformation characteristics. Due to the current technical limitations, the rigidity of the multi-point die working surface cannot be changed after the design is completed, and it cannot be regulated according to the demand for the bending die to apply deformation force to the parison. As the working time of the die increases, the deformation conditions and precision requirements of the bending product change, the rigidity of the die head body working surface should also change accordingly. Therefore, a control system that can adjust the rigidity characteristics of the die working surface in real time is needed to adapt to the personalized needs of different sections and maximize the functions of the multi-point bending forming processing system. Summary of the invention

[0005] The purpose of the present invention is to provide a method for changing the stiffness of the working surface of a profile multi-point drawing and bending die head body assisted by a magnetorheological elastomer, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a method for changing the stiffness of a working surface of a multi-point bending die head body of a profile by using a magnetorheological elastomer, comprising a stand, one side of the stand is movably connected with a threaded shaft, the top of the threaded shaft extends out of the stand, a slider is sleeved on the threaded shaft, after the slider moves vertically on the movable shaft, the slider is fixed by a round nut, a positioning plate 1 is fixed on the top of the threaded shaft, after the positioning plate 1 is rotated, the threaded shaft is fixed by a pair of screws;

[0007] A fixed shaft is fixed on the side of the slider, and the other end of the fixed shaft is movably connected to the mold base body. A mold head body is fixed on the side of the mold base body. A second positioning plate is fixed on the shaft body of the fixed shaft. After the mold base body is rotated, the mold base body is fixed by a second screw.

[0008] A working profile is arranged on the side of the die head body, a magnetorheological elastomer is bonded to the side wall of the working profile, and a magnetic control element is arranged on the top of the magnetorheological elastomer.

[0009] Furthermore, the magnetic control element is assembled from a magnetic core, an induction coil and a packaging shell, wherein the opening of the magnetic core faces upward and has a U-shaped cross-section, and the induction coil is wound around the outside of the magnetic core. When the induction coil is energized, the magnetic core forms magnetic poles on the upper surfaces of its two ends.

[0010] Furthermore, the magnetorheological elastomer includes an elastomer material matrix and magnetic particles;

[0011] The magnetic particles are uniformly distributed in the elastomeric material matrix.

[0012] A method for changing the stiffness of a working surface of a profile multi-point bending die head body assisted by a magnetorheological elastomer, using a profile multi-point bending die head body, including the following methods:

[0013] The first step: import the mathematical model of the forming component and the geometric data of the mold-related structural parts into the computer 3D drawing software, find out the normal section position of the profile to be controlled by the forming module through the geometric constraints, make a section, and adjust the mold after obtaining the corresponding parameters;

[0014] Step 2: Find the front and rear positions of the forming module on the working table of the stretch bending machine, and use T-bolt groups to fix the stretch bending dies in sequence;

[0015] Step 3: Find the height of the die head from the work surface, adjust the round nut to the correct position on the threaded shaft, and lock the slider with a double nut;

[0016] Step 4: Calculate the torsion angle of the threaded shaft around the vertical axis, adjust it through positioning plate 1, and lock it with screw 1;

[0017] Step 5: Calculate the torsion angle of the mold head body around the horizontal axis, adjust the position of the second positioning plate and lock it with the second screw;

[0018] Step 6: By adjusting the magnetic field, the stiffness of the magnetorheological elastomer is changed, thereby changing the overall stiffness characteristics of the working surface of the mold head to adapt to the deformation requirements of the molded component.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The magnetorheological elastomer-assisted variable stiffness method of the working surface of the profile multi-point stretch-bending die head body changes the stiffness of the magnetorheological elastomer by adjusting the magnetic field, thereby changing the overall stiffness characteristics of the die head body working surface, so that the die head body working surface can regionally and individually adjust the stiffness properties of the multi-point stretch-bending system die working surface according to the stretch-bending forming deformation conditions, thereby realizing the stiffness of the die head body working surface and controlling the deformation force it exerts on the blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the working state of the present invention;

[0022] Figure 2 A half-section view of the die head body of the present invention;

[0023] Figure 3 A half-section diagram of a packaged magnetron element of the present invention;

[0024] Figure 4 It is a schematic diagram of the profile of the present invention after the bending is completed.

[0025] In the figure: 1. mold head body; 2. magnetorheological elastomer; 3. magnetron element; 4. mold base body; 5. magnetic core; 6. induction coil; 7. packaging shell. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1-Figure 3 As shown, the present invention provides a technical solution: a profile multi-point drawing and bending die head body, including a vertical frame, a threaded shaft movably connected to one side of the vertical frame, the vertical frame extends from the top of the threaded shaft, a slider is sleeved on the threaded shaft, after the slider moves vertically on the movable shaft, the slider is fixed by a round nut to achieve height adjustment of the slider, a positioning plate is fixed at the top of the threaded shaft, after the positioning plate is rotated, the threaded shaft is fixed by a pair of screws to achieve torsion angle adjustment of the threaded shaft around the vertical axis.

[0028] A fixed shaft is fixed on the side of the slider, and the other end of the fixed shaft is movably connected to the mold base body 4. A mold head body 1 is fixed on the side of the mold base body 4, and a positioning plate 2 is fixed on the shaft body of the fixed shaft. After the mold base body 4 is rotated, the mold base body 4 is fixed by screw 2 to realize the torsion angle adjustment of the mold head body 1 around the horizontal axis.

[0029] A working surface is arranged on the side of the die head body 1 , a magnetorheological elastomer 2 is bonded to the side wall of the working surface, and a magnetic control element 3 is arranged on the top of the magnetorheological elastomer 2 .

[0030] Among them, Figure 2 and Figure 3 As shown, the magnetic control element 3 is assembled by a magnetic core 5, an induction coil 6 and a packaging shell 7, wherein the opening of the magnetic core 5 faces upward and the cross section is U-shaped, the induction coil 6 is wound around the outside of the magnetic core 5, and after the induction coil 6 is energized, the magnetic core 5 forms magnetic poles on the upper surfaces of its two ends, and the packaging shell 7 is used to encapsulate the magnetic core 5 and the magnetic induction coil 6, and allows the two ends of the magnetic core 5 to be exposed on the upper surface of the packaging shell 7.

[0031] The magnetorheological elastomer 2 includes an elastomer material matrix and magnetic particles, wherein the magnetic particles are uniformly distributed in the elastomer material matrix, that is, the magnetorheological elastomer 2 is prepared by adding the magnetic particles to the elastomer material and then prefabricating the elastomer in a magnetic field.

[0032] A method for changing the stiffness of a working surface of a profile multi-point bending die head body assisted by a magnetorheological elastomer, using a profile multi-point bending die head body, including the following methods:

[0033] The first step: import the mathematical model of the forming component and the geometric data of the mold-related structural parts into the computer 3D drawing software, find out the normal section position of the profile to be controlled by the forming module through the geometric constraints, make a section, and adjust the mold after obtaining the corresponding parameters;

[0034] Step 2: Find the front and rear positions of the forming module on the working table of the bending machine, and use T-bolt groups to fix the bending dies in sequence. Specifically, in a specific embodiment of this scheme, Figure 1 The figure shows a working state of a multi-section controlled profile three-dimensional drawing and bending die composed of a group of forming modules composed of 11 die heads 1, which is used for drawing and bending a "T"-shaped profile (see Figure 4 ) of a three-dimensional bending and twisting forming component, a slide groove is provided on the workbench of the stretch bending machine, and a slider is provided at the bottom of the stretch bending die head body, the slider is adapted to the slide groove, and the stretch bending die head body is fixed to the workbench of the stretch bending machine through a T-bolt group after moving on the slide groove.

[0035] Step 3: Find the height of the mold head body 1 from the work surface, adjust the round nut on the threaded shaft to the correct position, and lock the slider with a double nut;

[0036] Step 4: Calculate the torsion angle of the threaded shaft around the vertical axis, adjust it through positioning plate 1, and lock it with screw 1;

[0037] Step 5: Calculate the torsion angle of the mold head body 1 around the horizontal axis, adjust the position of the positioning plate 2 and lock it with the screw 2;

[0038] Step 6: By adjusting the magnetic field, the stiffness of the magnetorheological elastomer 2 is changed, thereby changing the overall stiffness characteristics of the working surface of the mold head body 1 to adapt to the deformation requirements of the molded component.

[0039] Specifically, the mold head body 1 installed on the mold base body 4 is connected to the mold base body 4 to form a mold head body system. The mold head body system can be installed on the work table of the drawing and bending machine. According to the length of the drawing and bending part, multiple mold head body systems can be selected. Each mold base body 4 can be adjusted for forward, backward, up and down displacement on the work table of the drawing and bending machine. The mold head body 1 can also be adjusted for rotational motion around the pin shaft on the slider. In this way, the mold head body 1 is equivalent to the work table of the drawing and bending machine having 4 degrees of freedom to adjust the configuration surface of the mold head body to meet different curvature deformation requirements.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. A profile multi-point bending die head body, including a stand, characterized in that: A threaded shaft is movably connected to one side of the stand, and the stand is extended from the top of the threaded shaft. A slider is sleeved on the threaded shaft. After the slider moves vertically on the movable shaft, the slider is fixed by a round nut. A positioning plate 1 is fixed to the top of the threaded shaft. After the positioning plate 1 is rotated, the threaded shaft is fixed by a pair of screws. A fixed shaft is fixed on the side of the slider, the other end of the fixed shaft is movably connected to the mold base (4), a mold head body (1) is fixed on the side of the mold base (4), and a second positioning plate is fixed on the shaft of the fixed shaft. After the mold base (4) is rotated, the mold base (4) is fixed by a second screw; A working mold surface is arranged on the side of the mold head body (1), a magnetorheological elastomer (2) is bonded to the side wall of the working mold surface, and a magnetic control element (3) is arranged on the top of the magnetorheological elastomer (2).

2. A profile multi-point bending die head according to claim 1, characterized in that: The magnetic control element (3) is assembled from a magnetic core (5), an induction coil (6) and a packaging shell (7), wherein the opening of the magnetic core (5) faces upward and has a U-shaped cross section, and the induction coil (6) is wound around the outside of the magnetic core (5). When the induction coil (6) is energized, magnetic poles are formed on the upper surfaces of both ends of the magnetic core (5).

3. The profile multi-point bending die head according to claim 1, characterized in that: The magnetorheological elastomer (2) comprises an elastomer material matrix and magnetic particles; The magnetic particles are uniformly distributed in the elastomeric material matrix.

4. A method for changing the stiffness of a working surface of a profile multi-point bending die head with the assistance of a magnetorheological elastomer, characterized in that: The profile multi-point bending die head body according to any one of claims 1 to 3 is used, comprising the following method: The first step: import the mathematical model of the forming component and the geometric data of the mold-related structural parts into the computer 3D drawing software, find out the normal section position of the profile to be controlled by the forming module through the geometric constraints, make a section, and adjust the mold after obtaining the corresponding parameters; Step 2: Find the front and rear positions of the forming module on the working table of the stretch bending machine, and use T-bolt groups to fix the stretch bending dies in sequence; Step 3: Calculate the height of the die head body (1) from the work surface, adjust the round nut on the threaded shaft to the correct position, and lock the slider with a double nut; Step 4: Calculate the torsion angle of the threaded shaft around the vertical axis, adjust it through positioning plate 1, and lock it with screw 1; Step 5: Calculate the torsion angle of the die head body (1) around the horizontal axis, adjust the position of the second positioning plate and lock it with the second screw; Step 6: By adjusting the magnetic field, the stiffness of the magnetorheological elastomer (2) is changed, thereby changing the overall stiffness characteristics of the working surface of the mold head body (1) to adapt to the deformation requirements of the molded component.

Images