CN110918843A - Space envelope forming manufacturing method for thin-wall high-rib radiating component - Google Patents
Space envelope forming manufacturing method for thin-wall high-rib radiating component Download PDFInfo
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- CN110918843A CN110918843A CN201911176002.5A CN201911176002A CN110918843A CN 110918843 A CN110918843 A CN 110918843A CN 201911176002 A CN201911176002 A CN 201911176002A CN 110918843 A CN110918843 A CN 110918843A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/027—Trimming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K27/00—Handling devices, e.g. for feeding, aligning, discharging, Cutting-off means; Arrangement thereof
- B21K27/06—Cutting-off means; Arrangements thereof
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Abstract
The invention relates to a space enveloping forming manufacturing method of a thin-wall high-rib radiating component, which comprises the following steps: s1, designing a forged piece: the die parting surface of the forging of the thin-wall high-rib heat dissipation component is the plane of the base plate; the top of the side surface of the forging bottom plate is provided with an inclined flash; s2, blank design: the blank is a plate blank, and the shape of the contour line of the cross section of the plate blank is the same as that of the contour line of the cross section of the bottom plate; s3, space envelope forming; s4, envelope finishing; s5, ejecting the forged piece; s6, trimming: inserting the high rib of the forge piece obtained in the step S5 into a hole type cavity of a lower die of the trimming die, contacting an upper die of the trimming die with a forge piece bottom plate, and pushing the forge piece and the lower die of the trimming die to move downwards simultaneously; under the shearing action of the trimming die upper die and the trimming die fixed die, the flash of the forge piece is cut off; and S7, trimming and cutting the high rib end face. The invention can not only realize the integral forming of the thin-wall high-rib radiating component, but also improve the material utilization rate, the forming limit of the thin wall and the high rib and improve the loaded state of the die.
Description
Technical Field
The invention relates to the technical field of machining and manufacturing of radiating components, in particular to a space enveloping forming manufacturing method of a thin-wall high-rib radiating component.
Background
At present, high-end precise instruments and equipment in China are developing towards the direction of high power, high integration and high stability. The thin-wall high-rib radiating component is a key radiating component in precision instrument equipment and is a key part for improving the radiating performance of the precision instrument equipment. The performance of the component has become a critical factor in determining the ultimate performance and operational reliability of precision instrumentation. In order to improve the heat dissipation capacity of the component, the heat dissipation area must be enlarged in a limited space, so that the component has the shape characteristics of thin bottom plate, high ribs and the like. The shape characteristic of the thin-wall high-rib leads to great processing difficulty of the thin-wall high-rib heat dissipation component. At present, the main processing technology of the thin-wall high-rib heat dissipation component is to respectively process a bottom plate and high ribs by adopting a machining technology, and then connect the high ribs with the bottom plate in a manner of interference fit or riveting and the like. The processing technology has low material utilization rate, and the high ribs and the bottom plate are not integrated, so that the heat dissipation capacity of the heat dissipation component is obviously reduced. Secondly, related researches propose that a thin-wall high-rib heat dissipation component is manufactured by adopting an extrusion forming process. However, because the bottom plate of the component is extremely thin, the ribs are high and thin, and the flowing capability of metal in an extrusion die is poor, the thickness of the formable bottom plate and the height of the ribs are both very limited, and the formable range of the thin-wall high-rib heat dissipation component is severely limited. In addition, because the forming load in the extrusion forming process is large, the die is easy to lose efficacy, so the service life of the die is short, and the mass production of the thin-wall high-rib radiating component is not facilitated. In conclusion, the existing cutting processing technology and extrusion forming technology are difficult to realize the high-efficiency, high-performance and low-cost manufacture of the thin-wall high-rib heat dissipation component.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a manufacturing method for space envelope forming of a thin-wall high-rib radiating component, which not only can realize integral forming of the thin-wall high-rib radiating component, but also can improve the utilization rate of materials, the forming limit of the thin wall and the high rib and the loading state of a die.
The technical scheme adopted by the invention for solving the technical problems is as follows: a manufacturing method for forming space envelope of a thin-wall high-rib radiating component is constructed, the thin-wall high-rib radiating component comprises a bottom plate and high ribs, and the manufacturing method comprises the following steps:
s1, designing a forged piece: the die parting surface of the forging of the thin-wall high-rib heat dissipation component is the plane of the base plate; the top of the side surface of the forging bottom plate is provided with an inclined flange, and the angle of the flange is 30-45 degrees; the section radius of the high rib of the forging is equal to the high rib radius of the heat dissipation component, and the length of the high rib of the forging is 20-30% longer than that of the high rib of the heat dissipation component;
s2, blank design: the blank is a plate blank, and the shape of the contour line of the cross section of the plate blank is the same as that of the contour line of the cross section of the bottom plate;
s3, space envelope shaping: placing the plate blank into a lower die cavity for space envelope forming, wherein the plate blank is pushed by a lower die to approach an envelope die at a feeding speed v; the enveloping die carries out enveloping motion of a spiral track, and the plate blank is subjected to local, continuous and multi-pass enveloping rolling; the bottom plate of the thin-wall high-rib radiating component is formed by enveloping an enveloping die, and the high rib is formed by a lower die with a hole-shaped cavity;
s4, envelope finishing: stopping the feeding motion after the lower die finishes the preset displacement, and at the moment, changing the enveloping motion track of the enveloping die from a spiral track to a circular track to finish the finishing of the thin-wall high-rib heat dissipation component forging;
s5, ejecting the forged piece: after S4, the lower die descends to an initial position, the separation of the enveloping die and the lower die is realized, and the forge piece is completely ejected out of the lower die cavity;
s6, trimming: inserting the high rib of the forge piece obtained in the step S5 into a hole type cavity of a lower die of the trimming die, contacting an upper die of the trimming die with a forge piece bottom plate, and pushing the forge piece and the lower die of the trimming die to move downwards simultaneously; under the shearing action of the trimming die upper die and the trimming die fixed die, the flash of the forge piece is cut off;
s7, trimming and cutting the high rib end face: inserting the high rib of the forged piece obtained in the step S6 into a fixed die cavity of a high rib cutting die, and attaching the bottom plate of the forged piece to the fixed die under the loading of the pressing plate; the high ribs are cut by the movable die of the cutting die under the protection of the fixed die, so that the high ribs with equal height are obtained.
2. The manufacturing method for the space envelope forming of the thin-wall high-rib heat dissipation component according to claim 1, wherein the cross-sectional contour line of the slab is shifted inwards by 0.5mm to 1mm compared with the cross-sectional contour line of the bottom plate, and the thickness of the slab is calculated by formula (1):
f＝f0+(n×πr2h+7.5×C)/S (1)
wherein f is the thickness of the slab, f0The thickness of a bottom plate of the thin-wall high-rib radiating component is determined, S is the area of the cross section of the bottom plate of the thin-wall high-rib radiating component, C is the perimeter of the cross section of the bottom plate of the thin-wall high-rib radiating component, r is the high-rib radius of the thin-wall high-rib radiating component, h is the high-rib height of the thin-wall high-rib radiating component, and n is the number of high ribs.
In the scheme, an envelope vertex cone point O of a space envelope model is selected at the geometric center of the back of a bottom plate of the heat dissipation member, the point O is taken as an original point, the long side of the bottom plate of the heat dissipation member is taken as an x axis, and the short side of the bottom plate of the heat dissipation member is taken as a y axis, so that an envelope model coordinate system is established; the envelope motion equation of the envelope model is:
wherein (a, b, c) is the initial coordinate of any point A of the surface of the envelope model, t is the rotation time length of the envelope model, (a)1,b1,c1) Is the coordinate of point A at time t, σ is the angle of inclination of the envelope mode, ω1Inner eccentric sleeve speed, omega, for driving envelope mould movement2Inner eccentric sleeve speed for driving envelope mode motion, and when omega1＝ω2And ω is1·ω2When the motion track of the envelope mode is larger than 0, the motion track of the envelope mode is a circular track, and when omega is larger than 01≠ω2And ω is1·ω2When the motion track is larger than 0, the motion track of the envelope mode is a spiral line track.
In the above scheme, the design method of the envelope model is as follows: the contour curve group l on the back of the forging bottom plate of the thin-wall high-rib heat dissipation componentiCoordinate transformation is carried out according to equation (3) and formula (4) to obtain a corresponding cavity contour curve group l on the enveloping diei'; selecting any enveloping mode axial section to obtain a curve group li' intersection point P with the axial section of the envelopei(ii) a P is connected in sequence from the enveloping vertex point OiObtaining a cavity contour line L of the inner envelope mold of the axial section; by curve group liThe envelope model is a guide line, and the cavity contour line L of the envelope model is swept around the axis of the envelope model, so that the cavity contour surface of the envelope model can be obtained; combining the profile surface of the cavity with the cone of the enveloping die to obtain the enveloping die for forming the thin-wall high-rib heat dissipation component;
li′(u1,v1,w1)＝li(u0,v0,w0)·D (3)
wherein li(u0,v0,w0) Contour curve group of the back of forging bottom plate of thin-wall high-rib heat radiation componenti′(u1,v1,w1) Is a 1i(u0,v0,w0) And D is a rotation matrix.
In the scheme, the multi-ejector-rod type ejection mechanism for ejecting the heat dissipation component comprises 2 x n ejector rods and an ejection base plate, wherein the number of the ejector rods is twice that of the high ribs of the thin-wall high-rib heat dissipation component; the cross section shape of each ejector rod is the same as that of the corresponding high rib, and clearance fit is met between each ejector rod and the corresponding lower die hole type cavity; each hole type cavity comprises two small ejector rods, and the lower small ejector rod is embedded on the ejection backing plate in an interference fit manner; and an elastic body is arranged between the two small ejector rods in each hole type cavity, and when the small ejector rods above the elastic body are contacted with the longest high rib of the forge piece, the elastic body between the small ejector rods is compressed, so that the small ejector rods in the rest hole type cavities can be contacted with the corresponding forge piece high ribs.
In the scheme, the lower die of the trimming die is internally provided with a hole type cavity with the same shape as the section of the high rib of the forge piece, and the unilateral gap between the high rib of the forge piece and the hole type is 0.15-0.25mm, so that the high rib of the forge piece can be smoothly inserted into the hole type cavity of the lower die of the trimming die.
In the scheme, the fixed die of the high-rib cutting die is provided with the hole type cavity with the same section shape as the high rib of the forge piece, the high rib of the forge piece is in clearance fit with the hole type cavity, and the thickness of the fixed die is equal to the height of the high rib of the heat dissipation component.
The thin-wall high-rib heat dissipation component space enveloping forming manufacturing method has the following beneficial effects:
1. the invention adopts a space envelope forming method to form the thin-wall high-rib radiating component, and can replace a machining process to realize the integral forming of the bottom plate and the high ribs, thereby obviously improving the production efficiency.
2. The invention adopts a space envelope forming method to form the thin-wall high-rib radiating component, and can convert the integral deformation process into the accumulation process of local deformation, thereby obviously improving the metal flow capacity, reducing the forming load and prolonging the service life of a die.
3. The invention adopts the space envelope forming method to form the thin-wall high-rib heat dissipation component, can obviously improve the forming limit of the thin wall and the high rib, improve the loading state of a die, obtain a forging structure with excellent mechanical property, improve the utilization rate of materials and improve the production efficiency, and is a high-efficiency, high-performance and low-cost manufacturing method of the thin-wall high-rib heat dissipation component.
4. The enveloping die does enveloping motion of a spiral line track, so that the high rib filling uniformity of the heat dissipation component is improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a front view of a thin-walled high-rib heat dissipating member;
FIG. 2 is a top view of a thin-walled high-rib heat dissipating member;
FIG. 3 is a right side view of the thin-walled high-rib heat dissipating member;
FIG. 4 is a front view of a forging for a thin-walled high-rib heat dissipating member;
FIG. 5 is a top view of a forging for a thin-walled high-rib heat dissipating member;
FIG. 6 is a right side view of a forging for a thin-walled high-rib heat dissipating component;
FIG. 7 is a schematic diagram of an enveloping mold design method of a thin-wall high-rib heat-dissipating wall plate;
FIG. 8 is a schematic view of a spatial envelope forming mold for a thin-walled high-rib heat dissipation member;
FIG. 9 is a schematic view of a trimming die for a thin-walled high-rib heat dissipation member;
fig. 10 is a schematic view of a high rib end face trimming cutting die of the thin-walled high rib heat dissipation member.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 1, 2 and 3 are respectively a front view, a top view and a right view of a thin-wall high-rib heat dissipation member to be formed, wherein the length of a bottom plate is 69.5mm, the width of the bottom plate is 36mm, the thickness of the bottom plate is 3mm, and the diameter of a high rib is phi 1.8 mm.
The invention discloses a manufacturing method for space enveloping forming of a thin-wall high-rib radiating component, which comprises the following steps:
(1) designing a forged piece: fig. 4, 5 and 6 are respectively a front view, a top view and a right view of a thin-wall high-rib heat dissipation member forging. The die parting surface of the forging of the thin-wall high-rib heat dissipation component is the plane where the back surface of the bottom plate of the heat dissipation component is located. The top of the side face of the forging bottom plate of the thin-wall high-rib heat dissipation component is provided with an inclined flash, the angle of the flash is 45 degrees, and the thickness of the flash is 1.5 mm. The section radius of the high rib of the forging is equal to the radius of the high rib of the heat dissipation component, and the length of the high rib of the forging is 2mm longer than that of the high rib of the heat dissipation component.
(2) Blank design: the blank is a plate blank, the shape of the outline of the cross section of the plate blank is the same as that of the outline of the cross section of the bottom plate of the thin-wall high-rib radiating member, but the outline of the cross section of the plate blank deviates inwards by 0.5mm compared with the outline of the cross section of the bottom plate, so that the plate blank can be smoothly placed into a lower mold cavity for space envelope forming; the thickness of the slab is calculated from formula (1) to be 4.549 mm.
(3) Designing an envelope model: fig. 7 is a schematic diagram of an enveloping mold design method of the thin-wall high-rib heat dissipation wall plate. Selection of envelope vertex O of spatial envelope modelAt the geometric center of the back of the base plate of the heat dissipating member. The contour curve group l on the back of the forging bottom plate of the thin-wall high-rib heat dissipation componentiCoordinate transformation is carried out according to the equation and the equation (3) to obtain a corresponding cavity contour curve group l on the enveloping diei'. Selecting any enveloping mode axial section to obtain a curve group li' intersection point P with the axial section of the envelopei. P is connected in sequence from the enveloping vertex point OiAnd obtaining the cavity contour line L of the inner envelope mold of the shaft section. By curve group liThe envelope mold is a guide line, and the cavity contour line L of the envelope mold is swept around the axis of the envelope mold, so that the cavity contour surface of the envelope mold can be obtained. And combining the profile surface of the cavity with the cone of the enveloping die to obtain the enveloping die for forming the thin-wall high-rib heat dissipation component.
(4) The specific forming process of the thin-wall high-rib heat dissipation component in the example is as follows:
s1, blanking: obtaining a plate blank by stamping;
s2, space envelope shaping: fig. 8 is a schematic view of a space envelope forming mold of a thin-wall high-rib heat dissipation member. The slab prepared in the step S1 is placed in a cavity of a lower die 1 for space envelope forming, and the slab is pushed by the lower die 1 to approach an envelope die 2 at a feeding speed v of 5 mm/S. In order to improve the high rib filling uniformity of the heat dissipation component, the enveloping die carries out enveloping motion of a spiral track, and the plate blank is subjected to local, continuous and multi-pass enveloping rolling.
S3, envelope finishing: and stopping the feeding motion after the lower die finishes the preset displacement, and changing the enveloping motion of the enveloping die from a spiral track to a circular track so as to improve the forming precision of the thin-wall high-rib radiating component.
S4, ejecting the forged piece: after S3 is completed, the lower die 1 rapidly descends to the initial position, and the separation of the enveloping die 2 from the lower die 1 is realized. Thereafter, the main ejector rod 3 in the lower die pushes the ejection cushion plate 4 to move upwards, and the ejection cushion plate pushes the plurality of small ejector rods 5 to move upwards along the hole type cavities of the lower die. And after the small ejector rod is contacted with the high rib of the forging of the thin-wall high-rib heat dissipation component, the forging 6 is pushed to move upwards until the forging is completely ejected out of the lower die cavity.
S6, trimming: fig. 9 is a schematic view of a trimming die of the thin-wall high-rib heat dissipation member. And inserting the high rib of the forging obtained in the step S5 into the hole type cavity of the lower die 7 of the trimming die. The upper die 8 of the trimming die is in contact with the bottom plate of the forge piece and pushes the forge piece and the lower die of the trimming die to move downwards simultaneously. And under the shearing action of the trimming die upper die 8 and the trimming die fixed die 9, the flash of the forged piece is cut off.
S7, trimming and cutting the high rib end face: fig. 10 is a schematic view of a high rib end face trimming cutting die of the thin-walled high rib heat dissipation member. And (3) inserting the high ribs of the forged piece obtained in the step (S6) into the hole-shaped cavities of the fixed die 10 of the high rib cutting die, and attaching the bottom plate of the forged piece to the fixed die under the loading of the pressing plate 11. The high rib is cut by the movable die 12 of the cutting die under the protection of the fixed die 10, thereby obtaining the high rib of equal height.
Further, the multi-ejector-rod type ejection mechanism for demolding the heat dissipation member comprises 170 ejector rods with the number of high ribs being twice that of the thin-wall high-rib heat dissipation member and an ejection backing plate. The cross section of each ejector rod is the same as that of the corresponding high rib, the ejector rods and the corresponding lower die hole type cavities meet clearance fit, and the fit tolerance is H7/H6. Each hole type cavity comprises two small ejector rods, and the small ejector rods below are embedded on the ejection backing plate in an interference fit mode. And an elastic body 13 is arranged between the two small ejector rods in each hole type cavity, and after the small ejector rods above the elastic body 13 are contacted with the longest high rib of the forge piece, the elastic body 13 between the small ejector rods is compressed, so that the small ejector rods in the rest hole type cavities can be contacted with the corresponding high ribs of the forge piece, and the uniform stress of the forge piece in the demoulding process is ensured.
Furthermore, a hole type cavity with the same shape as the section of the high rib of the forge piece is arranged in the lower die 7 of the trimming die, and the unilateral gap between the high rib of the forge piece and the hole type is 0.2 +/-0.05 mm, so that the high rib of the forge piece can be smoothly inserted into the hole type cavity of the lower die 7 of the trimming die.
Furthermore, the fixed die 10 of the high rib cutting die is provided with a hole type cavity with the same section shape as the high rib of the forging, and the high rib of the forging is in clearance fit with the hole type cavity, and the fit tolerance is H7/H6. The thickness of the fixed mold 10 is equal to the height of the high rib of the heat radiating member.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A thin-wall high-rib radiating component space enveloping forming manufacturing method is characterized by comprising the following steps:
s1, designing a forged piece: the die parting surface of the forging of the thin-wall high-rib heat dissipation component is the plane of the base plate; the top of the side surface of the forging bottom plate is provided with an inclined flange, and the angle of the flange is 30-45 degrees; the section radius of the high rib of the forging is equal to the high rib radius of the heat dissipation component, and the length of the high rib of the forging is 20-30% longer than that of the high rib of the heat dissipation component;
s2, blank design: the blank is a plate blank, and the shape of the contour line of the cross section of the plate blank is the same as that of the contour line of the cross section of the bottom plate;
s3, space envelope shaping: placing the plate blank into a lower die cavity for space envelope forming, wherein the plate blank is pushed by a lower die to approach an envelope die at a feeding speed v; the enveloping die carries out enveloping motion of a spiral track, and the plate blank is subjected to local, continuous and multi-pass enveloping rolling; the bottom plate of the thin-wall high-rib radiating component is formed by enveloping an enveloping die, and the high rib is formed by a lower die with a hole-shaped cavity;
s4, envelope finishing: stopping the feeding motion after the lower die finishes the preset displacement, and at the moment, changing the enveloping motion track of the enveloping die from a spiral track to a circular track to finish the finishing of the thin-wall high-rib heat dissipation component forging;
s5, ejecting the forged piece: after S4, the lower die descends to an initial position, the separation of the enveloping die and the lower die is realized, and the forge piece is completely ejected out of the lower die cavity;
s6, trimming: inserting the high rib of the forge piece obtained in the step S5 into a hole type cavity of a lower die of the trimming die, contacting an upper die of the trimming die with a forge piece bottom plate, and pushing the forge piece and the lower die of the trimming die to move downwards simultaneously; under the shearing action of the trimming die upper die and the trimming die fixed die, the flash of the forge piece is cut off;
s7, trimming and cutting the high rib end face: inserting the high rib of the forged piece obtained in the step S6 into a fixed die cavity of a high rib cutting die, and attaching the bottom plate of the forged piece to the fixed die under the loading of the pressing plate; the high ribs are cut by the movable die of the cutting die under the protection of the fixed die, so that the high ribs with equal height are obtained.
2. The manufacturing method for the space envelope forming of the thin-wall high-rib heat dissipation component according to claim 1, wherein the cross-sectional contour line of the slab is shifted inwards by 0.5mm to 1mm compared with the cross-sectional contour line of the bottom plate, and the thickness of the slab is calculated by formula (1):
f＝f0+(n×πr2h+7.5×C)/S (1)
wherein f is the thickness of the slab, f0The thickness of a bottom plate of the thin-wall high-rib radiating component is determined, S is the area of the cross section of the bottom plate of the thin-wall high-rib radiating component, C is the perimeter of the cross section of the bottom plate of the thin-wall high-rib radiating component, r is the high-rib radius of the thin-wall high-rib radiating component, h is the high-rib height of the thin-wall high-rib radiating component, and n is the number of high ribs.
3. The manufacturing method for the space envelope forming of the thin-wall high-rib heat dissipation member as claimed in claim 1, wherein an envelope vertex cone point O of a space envelope mold is selected from a geometric center of the back of a bottom plate of the heat dissipation member, the point O is taken as an origin, a long side of the bottom plate of the heat dissipation member is taken as an x-axis, and a short side of the bottom plate of the heat dissipation member is taken as a y-axis, so that an envelope mold coordinate system is established; the envelope motion equation of the envelope model is:
wherein (a, b, c) is the initial coordinate of any point A of the surface of the envelope model, t is the rotation time length of the envelope model, (a)1,b1,c1) Is the coordinate of point A at time t, σ is the angle of inclination of the envelope mode, ω1For driving envelope-mode motionInner eccentric sleeve speed of omega2Inner eccentric sleeve speed for driving envelope mode motion, and when omega1＝ω2And ω is1·ω2When the motion track of the envelope mode is larger than 0, the motion track of the envelope mode is a circular track, and when omega is larger than 01≠ω2And ω is1·ω2When the motion track is larger than 0, the motion track of the envelope mode is a spiral line track.
4. The method for manufacturing the thin-wall high-rib heat dissipation member by space envelope forming according to claim 3, wherein the design method of the envelope die comprises the following steps: the contour curve group l on the back of the forging bottom plate of the thin-wall high-rib heat dissipation componentiAnd (5) carrying out coordinate transformation according to equation (3) and equation (4) to obtain a corresponding cavity profile curve group l 'on the enveloping die'i(ii) a Selecting any enveloping mold shaft section to obtain a curve group l'iThe intersection point P of the envelope mold and the axial sectioni(ii) a P is connected in sequence from the enveloping vertex point OiObtaining a cavity contour line L of the inner envelope mold of the axial section; in a curve group l'iSweeping the cavity contour line L of the envelope model around the axis of the envelope model to obtain a cavity contour surface of the envelope model; combining the profile surface of the cavity with the cone of the enveloping die to obtain the enveloping die for forming the thin-wall high-rib heat dissipation component;
l′i(u1,v1,w1)＝li(u0,v0,w0)·D (3)
wherein li(u0,v0,w0) Is a contour curve group l 'of the back surface of a forging bottom plate of a thin-wall high-rib heat dissipation component'i(u1,v1,w1) Is a 1i(u0,v0,w0) And D is a rotation matrix.
5. The manufacturing method for space envelope forming of the thin-wall high-rib heat dissipation member according to claim 1, wherein the multi-ejector-rod type ejection mechanism for ejecting the heat dissipation member comprises 2 x n ejector rods and an ejection backing plate, wherein the number of the ejector rods is twice that of the high ribs of the thin-wall high-rib heat dissipation member; the cross section shape of each ejector rod is the same as that of the corresponding high rib, and clearance fit is met between each ejector rod and the corresponding lower die hole type cavity; each hole type cavity comprises two small ejector rods, and the lower small ejector rod is embedded on the ejection backing plate in an interference fit manner; and an elastic body is arranged between the two small ejector rods in each hole type cavity, and when the small ejector rods above the elastic body are contacted with the longest high rib of the forge piece, the elastic body between the small ejector rods is compressed, so that the small ejector rods in the rest hole type cavities can be contacted with the corresponding forge piece high ribs.
6. The manufacturing method for the spatial envelope forming of the thin-wall high-rib heat dissipation component according to claim 1, wherein the lower die of the trimming die is provided with a hole type cavity with the same shape as the section shape of the high rib of the forging, and a single-side gap between the high rib of the forging and the hole type is 0.15-0.25mm, so that the high rib of the forging can be smoothly inserted into the hole type cavity of the lower die of the trimming die.
7. The method for manufacturing the space envelope molding of the thin-wall high-rib heat dissipation member as claimed in claim 1, wherein the fixed die of the high-rib cutting die is provided with a hole-shaped cavity with the same cross section shape as that of the high rib of the forging, the high rib of the forging is in clearance fit with the hole-shaped cavity, and the thickness of the fixed die is equal to the height of the high rib of the heat dissipation member.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911176002.5A CN110918843B (en) | 2019-11-26 | 2019-11-26 | Space envelope forming manufacturing method for thin-wall high-rib radiating component |
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| CN113083933A (en) * | 2021-03-26 | 2021-07-09 | 武汉理工大学 | Preparation method of large-size ultrafine-grained isotropic plate |
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