Magnetorheological porous soft mold and plate forming device

A magnetorheological and soft mold technology, applied in the field of magnetorheological porous soft molds and sheet metal forming devices, can solve problems such as inhomogeneous forming, increase or decrease the inflow of materials, large adjustable range, and improve deformation. The effect of uniformity

Active Publication Date: 2021-10-19

HENAN UNIV OF SCI & TECH

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AI-Extracted Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a magnetorheological porous soft mold to solve the problem that the elastic modulus of the magnetorheological elastomer in the prior art is the same everywhere, and ...

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Method used

(4) as shown in Figure 3, at t2 moments in the forming process, the size of the current is increased by the current regulator 1, so that the current I=I2, the magnetic induction intensity B=B2, the magnetorheological porous soft mold 6 The rigidity is also significantly improved. Under the extrusion of the plunger 8, the left side of the die 3 starts to be attached to the blank 5.

As shown in Figure 1, elastic matrix comprises two forming sections, is respectively left forming section and right forming section, and left forming section corresponds to the shallower part of plate blank 5 forming depth, and right forming section corresponds to plate blank 5 forming relatively The deep part; the two forming sections are arranged along the left and right directions, both of which have pores 11, and the porosity of the left forming section is greater than that of the right forming section, so that the elastic modulus of the left forming section is smaller...

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Abstract

The invention relates to a magnetorheological porous soft mold and a plate forming device. The magnetorheological porous soft mold comprises an elastic base body with pores; and magnetic particles integrally formed in the elastic base body, wherein the magnetic particles are distributed in the elastic base body in a dispersed mode and located outside the pores. The elastic base body comprises at least two forming sections; all the forming sections are internally provided with the pores, and the porosity of at least one forming section is larger than that of the other forming sections, so that the elastic modulus of the forming sections with the large porosity is smaller than that of the forming sections with the small porosity; or at least one forming section is internally provided with the pores and at least one forming section is not internally provided with the pores, so that the elastic modulus of the forming sections with the pores is smaller than that of the forming sections without the pores. Through the design of the structure, when a blank is in complete contact with a special-shaped female mold, the stress of the whole blank is uniform, and the situation that the blank is broken due to the fact that the forming force is too large when a deeper part is formed is avoided.

Technology Topic

Composite materialForming force +2

Image

Examples

Experimental program(5)

Example Embodiment

[0062] Example 1 of the sheet forming apparatus of the present invention:

[0063] like figure 1 As shown, the sheet forming means includes a concave mode 3, a coil 4, a magnetore porous soft mold 6, a frame 7, and a plunger 8, and the concave mode 3 is above the holder frame 7, and the recess 3 and theft frame 7 are pair. Set so that the mold cavity of the concave mode 3 and the inner cavity of the frame 7 are arranged, and the slab 5 is positioned between the concave mold 3 and theft frame 7; the magneto-flow multi-hole soft mold 6 and the plunger The head of the 8 is located in the inner cavity of the frame 7, and the coil 4 is set on the outer wall of the frame 7 and the recess 3, and the coil 4 is connected to the DC power supply 2 through the current regulator 1. Wherein, the frame 7 is a ring structure, and the coil 4 is a copper coil.

[0064] In this embodiment, the magnetic flow multi-hole soft mold 6 includes an elastic matrix and magnetic particles 10 having a pore 11, a pore 11 dispersed in an elastic matrix; magnetic particles 10 integrally solidified in an elastic matrix, magnetic particles 10 The elastic substrate is dispersed outside and is outside the hole 11.

[0065] In the present embodiment, the elastic substrate is a rubber base which may be a silicone rubber base or a polyurethane rubber substrate or the like.

[0066] In the present embodiment, the magnetic particles 10 are ferromagnetic particles, preferably, ferromagnetic particles are hydroxy iron powder. In other embodiments, the magnetic particles can be cobalt powder or nickel powder.

[0067] like figure 1 The elastomeric substrate includes two forming sections, respectively, the left forming segment and the right form, respectively, the left forming section is shaded by a shallow portion of the plate blank 5, and the right forming section corresponds to the plate blank 5; two The forming section is arranged in the left-right direction, both have a pore 11 in the two forming sections, and the porosity of the left forming section is greater than the porosity of the right forming section, so that the elastic modulus of the left forming section is smaller than the elastic modulus of the right form. In the forming process, the molding force provided on the left side of the elastic substrate is smaller than the molding force provided on the right side to improve the formation accuracy of the slab 5. Among them, the porosity refers to the ratio of the volume of all the pores in the same formation section and the ratio of the volume of the forming section.

[0068] In this embodiment, the dimensions of each of the apertures 11 in the left forming section are the same, the size of each of the apertures 11 in the right forming segment is the same; the number of pore 11 in the left forming section is smaller than the number of pore elements in the right form, and The size of the pore 11 in the left forming section is greater than the size of the pore 11 in the right forming segment.

[0069] In this embodiment, the pore 11 is mainly filled with air, and the pore 11 is similar to the spherical shape in a state in which the extrusion is not extruded. Under the action of the external magnetic field, the magnetic particles 10 distributed in the elastic matrix are rapidly columnar or chain along the direction of the magnetic induction line 9, so that the magnetic flow variable porous soft mold 6 is elastic in the magnetic injective direction. The modulus and rigidity are increased, and since the magnetic field is extremely fast, the rigidity of the magnetic flow multi-well soft mold 6 is controllable. Since the elastic substrate has two forming sections, and the elastic modulus of the two forming sections is different, the magnetic flow multi-hole soft mold 6 can be formed different depths in the primary molding process; and the forming process is easy to control and stabilize. Good sex, magnetic flow multi-hole soft mold 6 can be fully contacted with the sheet shaped portion, effectively solve the problem of local excessive deformation during the formation of the sheet.

[0070] In the present embodiment, the volume fraction of the magnetic particles 10 in the left and right forming sections is the same, so that under the action of external magnetic field, the rigidity of the magnetic flow multi-hole soft mold 6 is controllable in real time; and the magneto-flow multi-well soft mold 6 It is processed by 3D printing, and therefore, the volume fraction of the magnetic particles in the left and right forming sections is the same, and the processing of the magnetic flow multi-hole soft mold 6 is convenient.

[0071] In this embodiment, the volume fraction of the magnetic particles 10 in the left and right forming sections of 30%, the porosity of the left forming section is 30% before the formation, and the porosity of the left forming section is greater than the porosity of the right forming section. The elastic modulus of the segment is smaller than the elastic modulus of the right form, and the particle size of the magnetic particles 10 ranges from 3 ± 0.5 μm. In other embodiments, the volume fraction can take other values, the best mode is to make the volume fraction of ferromagnetic particles at 25-30%.

[0072] After the formation, the pore 11 is a non-critical structure, the volume fraction of the magnetic particles 10 in the left and right forming sections, is still equal, and is 25-30%, the porosity of the left forming section is greater than the porosity of the right forming segment, left forming The elastic modulus of the segment is smaller than the elastic modulus of the right form, and the particle size of the magnetic particles 10 is 2 ± 0.5 μm, which is slightly smaller than the pore as a rule structure.

[0073] In this embodiment, the interface between the magnetic flow multi-hole soft mold 6 and the slab 5 can produce a beneficial tangential friction, which can promote the flow of the slab to the deformation zone, improve the slab blank to the deformed area. Filling capacity, the filled rounded radius reaches 0.3 times the thickness of the sheet, improve the formability and forming accuracy of the plate blank.

[0074] The specific forming method of the above sheet forming apparatus is as follows:

[0075] (1) such as figure 1 As shown, the magnetornary porous soft mold 6 is placed in the holder frame 7, and the plate blanks 5 and the concave mode 3 are placed on the upper surface of the frame 7. The slab 5 is positioned between the recess 3 and the frame 7, and the coil 4 is connected to the DC power source 2 through the current regulator 1. Among them, the slab 5 uses a non-ferromagnetic metal sheet having a thickness of 0.5 mm, such as aluminum alloy sheet, stainless steel sheet, titanium alloy plate, and the like. In other embodiments, the thickness of the slate can also select other values, generally not more than 0.1 to 1 mm.

[0076] (2) figure 1 As shown in t 0 At the moment, the sheet forming device is placed on the work surface of the press, the press is activated, and the press is provided to provide a pressure brake F. The plunger 8 rises at a speed of V = 1.5 mm / s, and the magnetic flow varies by the porous soft mold 6 as a force medium, and the plate blank 5 is deformed. There is no current in the coil 4 before the formation begins, that is, the current I = 0, so the magnetic induction strength B = 0.

[0077] (3) figure 2 As shown in the formation t 1 Time, turn on the DC power supply 2, can adjust the size of the current in the coil 4 by the current regulator 1, so that the current I = I 1 , Magnetic induction strength is b = b 1 The direction of the magnetic induction line 9 is the direction indicated by the dashed arrow in the figure, at which time the plunger 8 starts extruding the plate blanks 5.

[0078] (4) image 3 As shown in the forming process t 2 Always, increase the current size of the current through the current regulator 1, so that the current i = i 2 , Magnetic induction strength B = B 2 The rigidity of the magnetic flow variable porous soft mold 6 is also significantly improved, and under the pressing of the plunger 8, the left side of the concave mold 3 begins to fit with the slab blank 5.

[0079] (5) Figure 4 As shown in the forming process t 3 At the moment, under the continuous squeeze of the plunger 8, the right side of the concave mold 3 is bonded to the slab blank 5.

[0080] (6) Turn off the DC power supply 2, the pressure engine beam uplink, open the concave mode 3 to obtain the final plate formed by the slab 5.

[0081] Among them, in the above steps (3) and step (4), magnetic induction strength B 1 = 0.2t, b 2 = 1.0t, the size of the magnetic induction strength can determine the rigidity of the magnetic flow to the porous soft mold 6. In the initial stage of forming, the forming depth of the slab 5 is smaller, and the desired molding force is smaller, and only the smaller magnetic field size can make the slat 5 to obtain sufficient filling ability, while the slab is 5 The forming depth has gradually increased, and the magnetic field must also change over time, and the rigidity of the multi-hole soft mold 6 is increased by increased the stiffness of the plate blanks.

[0082] It should be explained that t 3 At the time, the left side of the slab 5 has been substantially shaped, and under the continuous extrusion of the plunger 8, since the porosity of the left forming segment is greater than the porosity of the right forming segment, the stiffness of the left forming section is smaller than the stiffness of the right forming segment, Therefore, the right shaped section continues the right side of the sheet blank 5, and the force force applied to the left side of the slab 5 is small, which is advantageous to improve the uniformity of the slate force force, and avoid the left constraint of the slab 5. The force is large, causing the right side of the slab 5 due to excessive elongation deformation.

Example Embodiment

[0083] Example 2 of the sheet forming apparatus of the present invention:

[0084] The difference from the first embodiment is that the dimensions of each of the apertures 11 in the left forming segment are the same, and the dimensions of each of the apertures 11 in the right forming segment are the same, and the porosity within the left forming segment is greater than the right. The porosity in the forming section. In this embodiment, if Figure 5 As shown, the dimensions of each pore in the left forming section are not identical, and the dimensions of each pore in the right forming segment are not identical, and as long as the porosity in the left forming segment is greater than the porosity in the right forming segment.

Example Embodiment

[0085] Example 3 of the sheet forming apparatus of the present invention:

[0086]The difference from the first embodiment is that the aperture 11 is provided in the left-form section and the right forming section, and the porosity in the left forming segment is greater than the porosity in the right forming segment, so that the left The elastic modulus of the forming section is smaller than the elastic modulus of the right form. In this embodiment, there is a pore in the left-form section, and a pore is not provided in the right forming section to make the elastic modulus of the left forming section less than the elastic modulus of the right form.

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PUM

Property	Measurement	Unit
Particle size	1.0 ~ 5.0	µm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Large adjustable range

Magnetorheological porous soft mold and plate forming device

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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