CN115121780B - Centrifugal injection forming device capable of adjusting radial dimension of annular blank - Google Patents
Centrifugal injection forming device capable of adjusting radial dimension of annular blank Download PDFInfo
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- CN115121780B CN115121780B CN202210758421.5A CN202210758421A CN115121780B CN 115121780 B CN115121780 B CN 115121780B CN 202210758421 A CN202210758421 A CN 202210758421A CN 115121780 B CN115121780 B CN 115121780B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/2218—Cooling or heating equipment for dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/30—Accessories for supplying molten metal, e.g. in rations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/10—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying using centrifugal force
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a centrifugal injection forming device capable of adjusting the radial dimension of an annular blank, which comprises an annular die and a centrifugal atomizer, wherein the annular die comprises a rotary bottom plate and a plurality of annular baffles which can be detachably fixed on different circumferences of the rotary bottom plate, and the rotary bottom plate is provided with a central hole for the centrifugal atomizer to pass through. The invention can enrich the size specification of the blank with the annular structure formed by centrifugal injection, overcomes the problem that the casting industry changes the die along with the change of the specification and the size of the workpiece, can effectively improve the working environment of workers, reduce the labor intensity and save the manufacturing cost of the tool, and simultaneously has the advantages of near net forming, compact structure, convenient operation, multiple adaptation occasions, safety, high efficiency and the like.
Description
Technical Field
The invention belongs to the field of metal spray deposition, and particularly relates to a centrifugal spray forming device capable of adjusting radial dimensions of an annular blank.
Background
In recent years, with the development of industries such as mechanical industry, wind power industry and the like in China, rotating parts are increasingly applied to the rotating parts, radial specification sizes are various, the rotating parts are used as key core parts, the performance advantages and disadvantages of the rotating parts directly determine the service life of equipment and the operation safety, so that the attention of a processing technology of an annular structure in the rotating parts is high, the annular structure is required to be processed through a hollow forging, blanks required by the hollow forging are generally obtained through casting, shrinkage porosity and shrinkage cavity defects of the blanks can occur when melt is solidified due to the fact that the casting depends on the flow of metal liquid, the blank performance is poor, particularly the strength of a large annular member is low, the service life is short, the manufacturing period is long, and the inner wall is easy to have defects such as cracks and pits in the forging process.
Aiming at the problem that blank of hollow forging piece is easy to appear, adopting centrifugal injection forming method to solve the existing problem, said method is a process between casting metallurgy and powder metallurgy, it uses mechanical centrifugal atomization to form particles by molten metal or alloy in inert atmosphere, and directly sprays them onto cooler mould to produce impact, adhesion and solidification to form sediment, and the sediment can be processed by various densification to obtain the material with fine crystal grain and excellent component uniformity. Because the flow method of liquid metal does not occur during centrifugal spray forming solidification, shrinkage porosity and shrinkage cavity caused by solidification shrinkage under casting conditions do not occur, the workpiece performance obtained by the method is higher than that of the annular blank prepared by traditional casting, and the method has good subsequent processing performance and even can obtain superplasticity.
However, in the existing centrifugal injection forming device, the same forming device can only meet the forming requirement of annular blanks with one radial dimension, and when annular blanks with different radial dimensions are required to be manufactured, different forming devices are required to be used, so that the equipment requirement is increased, the space is occupied, and the cost is increased.
Disclosure of Invention
In view of the defects of the existing centrifugal injection molding technology, the invention aims to provide the centrifugal injection molding device capable of adjusting the radial dimension of the annular blank, so that the centrifugal injection molding device can be assembled to form annular dies with different specifications, the radial dimension of the annular blank can be adjusted, and the requirement of various radial specification dimensions of the dies can be met.
The aim and the technical problems of the invention are realized by adopting the following technical proposal. According to the centrifugal injection forming device capable of adjusting the radial dimension of the annular blank, the centrifugal injection forming device comprises an annular die and a centrifugal atomizer, wherein the annular die comprises a rotary base plate and a plurality of annular baffles which can be detachably fixed on different circumferences of the rotary base plate, and the rotary base plate is provided with a central hole for the centrifugal atomizer to pass through.
The aim and the technical problems of the invention can be further realized by adopting the following technical measures.
In the centrifugal injection molding device capable of adjusting the radial dimension of the annular blank, a plurality of positioning grooves extending along the radial direction are distributed on the rotating bottom plate along the circumferential direction, and the annular baffle is fixedly connected with the rotating bottom plate through the cooperation of the fixing part extending out of the bottom of the annular baffle and the positioning grooves.
In the centrifugal injection molding device capable of adjusting the radial dimension of the annular blank, the fixing part penetrates through the positioning groove and extends out from the lower part of the rotating bottom plate, and the fixing nut below the fixing part locks the fixing part and the rotating bottom plate.
The centrifugal injection forming device capable of adjusting the radial size of the annular blank is characterized in that adjusting score lines for displaying the diameter of the circumference of the annular blank are further arranged on two sides of the positioning groove, and marking lines for realizing the accurate positioning of the annular baffle by matching with the adjusting score lines are further arranged on two sides of the fixing part.
The centrifugal injection forming device with the adjustable radial size of the annular blank is of a split type structure formed by splicing the sector-shaped baffle and the supporting upright post, the supporting upright post comprises an upper fixing portion, a lower fixing portion and a supporting portion, wherein the lower fixing portion penetrates through the positioning groove and is fixedly connected with the rotating bottom plate through a fixing nut, the supporting portion is connected with the sector-shaped baffle through a concave-convex structure in a matched mode, and the fixing nut screwed on the upper fixing portion is pressed on the sector-shaped baffle.
According to the centrifugal injection forming device capable of adjusting the radial dimension of the annular blank, the two sides of the supporting part are provided with the marking lines which are used for being matched with the adjusting score lines to realize the accurate positioning of the annular baffle.
In the centrifugal injection molding device capable of adjusting the radial dimension of the annular blank, the positioning groove is a through groove with one side open.
The centrifugal spray forming device capable of adjusting the radial dimension of the annular blank comprises a centrifugal disc and a connecting sleeve, wherein a cavity is formed below the disc surface of the centrifugal disc for bearing metal liquid; the connecting sleeve is used for transmitting the power of the driving device to the centrifugal disc and is provided with cooling water which can fully flow in the cavity of the centrifugal disc, and when the thickness of a solid layer formed by solidifying the metal liquid on the disc surface reaches a set value, the cooling water in the cavity can establish steady-state heat conduction with the metal liquid above the solid layer.
The centrifugal spray forming device with the adjustable radial size of the annular blank is characterized in that the connecting sleeve is provided with a water inlet hole for conveying cooling water to the cavity of the centrifugal disc and a plurality of water outlet holes for discharging the cooling water in the centrifugal disc, the water inlet holes are positioned in the middle of the connecting sleeve, and the water outlet holes are uniformly distributed around the water inlet holes.
In the centrifugal injection molding device capable of adjusting the radial dimension of the annular blank, when cooling water and metal liquid establish steady-state heat conduction, the following relationship exists between the centrifugal disk and the solid layer:
wherein k is Gold alloy Thermal conductivity, k, of a metal in a solid layer Disk For the thermal conductivity of the centrifugal disk, H Gold alloy Is a set thickness of solid layer metal, H Disk For the thickness of the centrifugal disk surface, T Melting Is the metal melting point temperature, T Fixing device Is the temperature between the solid layer and the surface of the centrifugal disk, T Water and its preparation method The highest temperature of the cooling water.
Compared with the prior art, the invention has obvious advantages and beneficial effects. By means of the technical scheme, the invention can achieve quite technical progress and practicability, has wide industrial application value, and has at least the following advantages:
the invention can enrich the size specification of the blank with the annular structure formed by centrifugal injection, overcomes the problem that the casting industry needs to integrally replace the die and even replace the device due to the change of the specification and the size of the workpiece, can effectively improve the working environment of workers, reduce the labor intensity and save the manufacturing cost of the tool, and simultaneously has the advantages of near net forming, compact structure, convenient operation, multiple adaptation occasions, safety, high efficiency and the like.
Drawings
FIG. 1 is a schematic illustration of a centrifugal spray forming apparatus for adjusting the radial dimension of an annular blank according to the present invention;
FIG. 2 is a schematic diagram of the die assembly of the centrifugal spray forming device capable of adjusting the radial dimension of the annular blank;
FIG. 3 is a schematic view of a rotating bottom plate of a centrifugal spray forming device with adjustable radial dimensions of an annular blank according to the present invention;
FIG. 4 is a schematic view of a support column of a centrifugal spray forming device of the present invention with adjustable radial dimensions of an annular blank;
FIG. 5 is a schematic view of an annular baffle of a centrifugal spray forming apparatus of the present invention with adjustable radial dimensions of an annular blank;
FIG. 6 is a schematic view of a centrifugal disk of a centrifugal spray forming apparatus of the present invention with adjustable radial dimensions of an annular blank;
FIG. 7 is a schematic view of the structure of a connecting sleeve of a centrifugal injection molding device capable of adjusting the radial dimension of an annular blank;
FIG. 8 is a bottom view of FIG. 7;
fig. 9 is a schematic view showing a centrifugal atomizer of a centrifugal spray forming apparatus capable of adjusting radial dimensions of an annular blank according to the present invention.
[ Main element symbols description ]
1: rotary bottom plate
2: sector baffle
3: support column
4: nut
5: positioning groove
6 centrifugal disk
7: connecting sleeve
8: solid layer
9: water inlet
10: drainage hole
a, blank
b: centrifugal atomizer
c: catheter tube
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description refers to the specific implementation, structure, characteristics and effects of the centrifugal injection forming device capable of adjusting the radial dimension of the annular blank according to the invention with reference to the accompanying drawings and the preferred embodiment.
Referring to fig. 1-9, which are schematic structural views of parts of a centrifugal spray forming device capable of adjusting radial dimensions of an annular blank according to the present invention, the device includes an annular mold and a centrifugal atomizer b located in the annular mold, the annular mold is simultaneously rotated and axially reciprocated by a driving device, and the centrifugal atomizer is also rotated in the annular mold under the driving of the corresponding driving device, so as to spray atomized metal droplets onto an inner wall of the annular mold to form a blank a.
The annular mold comprises a rotary bottom plate 1 and a plurality of annular baffles which can be detachably fixed on different circumferences of the rotary bottom plate 1, wherein different annular baffles have different inner diameters, so that the annular baffles can be matched with the rotary bottom plate 1 to form annular molds with different inner diameter specifications.
The bottom of the rotary bottom plate 1 is connected with a driving device, a central hole 11 for the centrifugal atomizer b to pass through is formed in the middle of the rotary bottom plate, namely, the rotary bottom plate 1 is of an annular structure, a plurality of positioning grooves 5 extending along the radial direction are distributed on the rotary bottom plate 1 along the circumferential direction, and the annular baffle plate is fixedly connected with the rotary bottom plate 1 through the cooperation of a fixing part extending out of the bottom of the annular baffle plate and the positioning grooves 5. Preferably, the fixing part extending out of the bottom of the annular baffle is provided with external threads, the fixing part passes through the positioning groove 5 and is matched and locked with the fixing nut 4, and the fixing nut 4 is matched with the lower surface of the rotating bottom plate 1 to realize the fixed positioning of the annular baffle on the rotating bottom plate 1.
In order to realize accurate adjustment of the size of the die, two sides of the positioning groove 5 are also provided with adjusting score lines 51, and the adjusting score lines 51 are used for displaying the diameters of the circumferences of the adjusting score lines, so that the positions of the annular baffles with different specifications on the rotating bottom plate can be accurately positioned.
In the embodiment of the invention, the annular baffle comprises the supporting upright posts 3 and the sector baffle 2, and each annular baffle is formed by splicing a plurality of supporting upright posts 3 and the sector baffle 2, so that the supporting upright posts 3 and the sector baffles 2 corresponding to different annular baffles have different dimension specifications.
In the embodiment of the invention, the number of the supporting upright posts 3 is identical to that of the positioning grooves 5, one supporting upright post 3 is fixed in each positioning groove 5, and the bottom of the sector baffle plate 2 which is matched with the supporting upright posts 3 to form an annular baffle plate is supported on the rotating bottom plate 1, so that the positioning in one direction of the radial direction and the axial direction is realized. The fastening piece fixed at the upper end of the supporting upright post 3 is tightly pressed on the upper end surface of the sector baffle plate 2, so that the sector baffle plate 2 is positioned in the other axial direction, and the reliable assembly of the annular die is realized.
In the embodiment of the present invention, the support column 3 is sequentially provided with an upper fixing portion 31, a support portion 32 and a lower fixing portion 33 along the axial direction, wherein the peripheries of the upper fixing portion 31 and the lower fixing portion 33 are respectively provided with a thread for being matched and locked with the fixing nut 4. The outer diameters of the upper fixing portion 31 and the lower fixing portion 33 are smaller than the outer diameter of the supporting portion 32, so that a blocking surface 301 is formed between the upper fixing portion 31 and the supporting portion 32 and between the lower fixing portion 33 and the supporting portion 32. When the support column 3 is fixed, the lower fixing portion 33 passes through the positioning groove 5 and extends out from the bottom of the rotating bottom plate 1, a stop surface formed between the supporting portion 32 and the lower fixing portion 33 is in stop limit with the upper surface of the rotating bottom plate 1, and the fixing nut 4 screwed at the lower end of the lower fixing portion 33 is matched with the lower surface of the rotating bottom plate 1 to realize the fixed positioning of the support column 3 on the rotating bottom plate 1.
The fan-shaped baffle plate 2 is matched with the supporting upright posts 3 to jointly form an annular baffle plate supported on the rotary bottom plate 1, both circumferential sides of the fan-shaped baffle plate 2 are limited by the corresponding supporting upright posts 3, and the fan-shaped baffle plate 2 is tightly pressed on the rotary bottom plate by fixing nuts screwed on fixing parts 31 on the supporting upright posts 3 so as to prevent local movement in the injection forming process and influence the quality of annular blanks.
In the embodiment of the invention, the fan-shaped baffle plate 2 and the supporting upright post 3 are matched through a concave-convex structure to realize positioning. Preferably, the support portion 32 of the support upright 3 is provided with a guide groove 321, the corresponding position of the fan-shaped baffle 2 is provided with a guide protrusion 21, and the assembly guiding and positioning between the support upright 3 and the fan-shaped baffle 2 are realized through the cooperation of the guide protrusion and the guide groove. Preferably, the guide protrusion is a T-shaped protrusion, and the guide groove is a T-shaped groove, but is not limited thereto.
In order to facilitate positioning the position of the support upright 3 and realize quick positioning of the annular baffle, the middle positions of the two sides of the support upright 3 are also provided with identification lines 34 for being matched with the adjustment score lines 51 on the two sides of the positioning groove 5, and when the identification lines 34 on the two sides of the support upright 3 are aligned with a certain numerical value of the adjustment score lines 51 on the positioning groove 5, the diameter of the annular baffle formed by the support upright 3 and the corresponding sector baffle at the position is the numerical value.
In the embodiment of the present invention, the positioning groove 5 is a through groove with one side open, so that the annular baffle positioned by the positioning groove 5 has a maximum diameter and a minimum diameter. Preferably, the positioning groove 5 is open at one side far away from the center of the rotating baffle.
When the annular die works, corresponding support columns 3 and sector baffles 2 are selected according to the size of a blank to be processed, then the support columns 3 are pre-fixed on a rotary bottom plate 1 by using fixing nuts 4, the support columns 3 are positioned on the circumference with the required diameter through adjustment scales on the rotary bottom plate 1, then the sector baffles 2 are assembled in place through guide structures on the side surfaces of the support columns 3, the sector baffles 2 and the support columns 3 form an annular structure, finally the upper ends of the sector baffles 2 are fixed by using the fixing nuts 4, and the fixing nuts 4 with preset lower ends are screwed.
In operation, the maximum diameter D of the rotating floor 1 is known to be adjustable max Minimum diameter D min To meet the diameter D requirement (D min ≤D≤D max ) Only need to select the supporting column and the sector baffle with corresponding sizes, adjust the alignment of the score line on the supporting column 3 and the score line with the diameter D on the rotating bottom plate 1, then pre-tighten the fixing nut 4 below the supporting column 3 of the rotating bottom plate 1, and then guide the T shape protruding from the sector baffle 2 along the T shape recessed from the supporting column 3The upper end of the sector baffle plate 2 is fixed by using the fixing nut 4, the lower end is fixed by rotating the bottom plate 1, and the fixing nut 4 at the lower end of the supporting upright post 3 is screwed down, so that the diameter D value of the centrifugal spray forming equipment is prevented from changing due to vibration and the like during operation. After the diameter D of the workpiece a is adjusted, the centrifugal atomizer b enters an annular structure formed by the sector annular baffle 2 and the supporting upright post 3 through a central hole on the rotating bottom plate 1, the centrifugal atomizer b starts to rotate, then molten metal flows to the surface of the centrifugal atomizer b from the flow guide pipe c, the molten metal on the surface of the centrifugal atomizer b is sprayed into the annular structure formed by the sector baffle 2 capable of rotating and reciprocating up and down and the supporting upright post 3 under the action of centrifugal force, impact, bonding and solidification are generated on the annular structure to form an annular blank a, after the spray forming is finished, the centrifugal atomizer b exits the annular structure formed by the sector baffle 2 and the supporting upright post 3 through a central hole on the rotating bottom plate 1, the fixing nuts 4 at the upper end and the lower end of the supporting upright post 3 are loosened, the sector baffle 2 and the supporting upright post 3 are detached from the rotating bottom plate 1, the annular blank a is taken out, and the spray forming work is finished.
In the embodiment of the invention, the centrifugal atomizer b comprises a centrifugal disc 6 and a connecting sleeve 7, wherein the centrifugal disc 6 comprises a disc body 61 and a supporting rod 62, the disc body 61 comprises a disc surface 65 for bearing metal liquid and a first cavity 63 formed below the disc surface, the supporting rod 62 is internally provided with a second cavity 64 extending along the axial direction and communicated with the first cavity 63, and the connecting sleeve 7 extends into the second cavity 64 of the supporting rod 62 and is fixedly connected with the supporting rod 62. The connecting sleeve 7 can convey cooling water into the first cavity 63 and the second cavity 64, and can establish stable heat conduction with liquid metal on the surface of a metal solid layer with set thickness when the metal solid layer with set thickness is formed on the upper surface of the disc surface 65, so that the thickness of the solid layer is kept unchanged.
In this embodiment, the support rod 62 is fixedly connected with the connecting sleeve 7 through threads; the tray 61 and the support bar 62 are integrally formed. The centrifugal disc 6 and the connecting sleeve 7 are coaxially arranged, and the connecting sleeve 7 is connected with a rotating motor through other devices, so that the centrifugal disc 6 is driven in a rotating way.
The connecting sleeve 7 sends fresh cooling water into the second cavity 64 and the first cavity 63 through the water inlet hole 9 on the connecting sleeve 7 to cool the disc surface 65, and the connecting sleeve 7 is also provided with a water outlet hole 10 for discharging the cooling water in the first cavity 63 and the second cavity 64 to realize cooling water replacement and circulation. That is, the connecting sleeve 7 can provide a stable and reliable water cooling system for the centrifugal disk 6, and when the thickness of the metal solid layer 8 formed on the surface of the disk surface 65 reaches a set value, the water cooling system establishes steady-state heat conduction with the liquid metal carried on the surface of the centrifugal disk 6, so that the solid layer 8 formed by the liquid metal on the surface of the centrifugal disk 6 can be kept at the set thickness, the temperature of the bottom of the metal liquid film formed by the liquid metal and the top surface of the fixed layer 8 is kept at the melting point of the metal, and at the moment, the temperature of the top surface of the metal liquid film can be kept at the casting temperature, so that the thickness of the fixed layer 8 is not increased, and is not remelted, and the surface of the centrifugal disk 6 always has a protective layer with proper thickness, thereby realizing the purpose of injecting high-temperature metal or continuous injection. Preferably, the set thickness of the solid layer is 0.1-2mm.
In this embodiment, there is one water inlet hole 9, which is located in the middle of the connecting sleeve 7 and extends along the axial direction, and there are a plurality of water outlet holes 10, which are uniformly distributed around the water inlet hole 9 and extend along the axial direction, and the diameter of the water inlet hole 9 is far greater than the diameter of the water outlet hole 10, and the diameter of the water inlet hole 9 is equal to the sum of the diameters of all the water outlet holes 10.
The following is a calculation of the steady-state establishment process of the centrifugal disk, and the heat transfer process according to the one-dimensional steady-state problem can be known:
in the above, k Gold alloy To solidify the thermal conductivity of the layer metal, k Disk For the thermal conductivity of the centrifugal disk, H Gold alloy For setting the thickness of the solid layer formed by solidifying the metal, the thickness is generally 0.1-2mm, H Disk For the thickness of the centrifugal disk surface, T Melting Is the metal melting point temperature, T Fixing device Is the temperature between the solid layer and the surface of the centrifugal disk100 ℃ lower than the melting point of the metal, T Water and its preparation method The maximum temperature of the cooling water is generally 75-95 ℃.
The thickness H of the centrifugal disk can be obtained through the heat transfer process of the one-dimensional steady state problem Disk 。
And after the thickness of the centrifugal disk is obtained, quantifying the flow of the cooling water according to a heat conduction formula.
In the above, ρ Water and its preparation method To density of cooling water c Water and its preparation method To cool the specific heat capacity of water, Q Water and its preparation method T is the flow rate of cooling water 0 For the initial temperature of the cooling water, typically 25℃S Disk Is the surface area of the centrifuge disk.
In the above, d Disk Is the diameter of the centrifugal disk.
After obtaining cooling water Q Water and its preparation method The size of the cooling water inlet hole can be calculated under the condition of a certain flow rate.
Q Water and its preparation method ＝v Water and its preparation method S Feeding in
In the above, S Feeding in D is the sectional area of the water inlet 9 Feeding in Is the diameter of the water inlet hole 9.
In the above formula, n is the number of the drain holes 10, d Out of Is the diameter of the single drain hole 10.
After obtaining the flow rate of the cooling water, the flow rate of the metal flowing to the centrifugal disk 6 through the flow guide pipe c is quantized, and assuming that the heat loss of the liquid metal is half of the superheat degree and is equal to the heat taken away by the cooling water, the flow rate of the liquid metal can be obtained by the following formula.
0.5ρ Gold alloy c Gold alloy Q Gold alloy △T＝ρ Water and its preparation method c Water and its preparation method Q Water and its preparation method (T Water and its preparation method -T 0 )
In the above, ρ Gold alloy For density of metal, c Gold alloy Is the specific heat capacity of metal, Q Gold alloy The flow rate of the metal is defined as DeltaT, and the superheat of the metal is generally 100 ℃.
Based on the calculation, the invention can control the thickness of the solid layer solidified on the surface of the centrifugal disk through the flow of cooling water, further quantize the metal flow of centrifugal injection, establish a balance process among the cooling water flow, the metal flow and the thickness of the centrifugal disk to achieve the purpose of protecting the centrifugal disk, and simultaneously improve the quantizing basis for designing the size of the centrifugal disk and the size of the cooling water inlet and outlet.
The following is a specific embodiment, illustrating the calculation modes of the cooling water flow, the metal flow, the thickness of the centrifugal disk, the size of the water inlet hole and the size of the water outlet hole.
The diameter of the centrifuge disk 6 is known to be 60mm; the flow rate of the cooling water is 0.4m/s; the centrifugal disk is made of pure copper, and the metal liquid flow is aluminum liquid.
The heat transfer process according to the one-dimensional steady state problem is as follows:
in the above, k Gold alloy The thermal conductivity of the metal as a solid layer is 237W/(m.k); k (k) Disk The value of the thermal conductivity of the centrifugal disk is 401W/(m.k); h Gold alloy The thickness of the solid layer metal is set to be 1mm, H Disk For centrifuging the thickness of the disk surface part, T Melting Is metal melting point temperature, value is 660 ℃, T Fixing device For the temperature between the solidified layer and the centrifuge disk, the value was 560 ℃, T Water and its preparation method The maximum temperature of the cooling water was 90 ℃.
The thickness of the centrifugal disk can be obtained according to a formula
Centrifugal disk surface area:
and obtaining the cooling water flow according to the one-dimensional steady-state heat conduction.
In the above, ρ Water and its preparation method Is water density of 998kg/m 3 ，c Water and its preparation method The specific heat capacity of water is 4200J/kg DEG C, Q Water and its preparation method For the flow of water, T 0 The initial temperature of the water is 25 ℃, S Disk Surface area of the centrifuge disk, value 2.826 ×10 -3 m 2 。
Cooling water flow rate:
liquid metal flow rate:
cooling water inlet size:
in order to facilitate the subsequent part processing and calculation, the diameter of the cooling water inlet hole is 30mm,
the number of the drain holes is 6, and the diameter of each drain hole is 5mm
In summary, when the flow rate of the cooling water was 0.4m/s in the centrifugal disk having a diameter of 60mm, the flow rate of the metal liquid was 5.36×10 -4 m 3 The thickness of the centrifugal disc is 8mm, the cooling water inlet holes are 30mm, the number of the water drain holes is 6, the diameter of the water drain holes is 5mm, a stable solid layer with the thickness of 1mm can be formed on the surface of the centrifugal disc, the centrifugal disc is effectively protected from being damaged by ablation, and high-efficiency injection molding can be guaranteed.
In the embodiment of the invention, the liquid metal enters the surface of the centrifugal disk through the flow guide pipe, and meanwhile, cooling water enters the cavity of the centrifugal disk 6 through the connecting sleeve 7 to cool the centrifugal disk.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (8)
1. The utility model provides an adjustable annular blank radial dimension's centrifugal injection forming device which includes annular mould and centrifugal atomizer, its characterized in that: the annular die comprises a rotary bottom plate and a plurality of annular baffles which can be detachably fixed on different circumferences of the rotary bottom plate, and the rotary bottom plate is provided with a central hole for the centrifugal atomizer to pass through; the centrifugal atomizer comprises a centrifugal disc and a connecting sleeve, and a cavity is formed below the disc surface of the centrifugal disc for bearing metal liquid; the connecting sleeve is used for transmitting the power of the driving device to the centrifugal disc and is provided with cooling water which can fully flow in the cavity of the centrifugal disc, and when the thickness of a solid layer formed by solidifying the metal liquid on the disc surface reaches a set value, the cooling water in the cavity can establish steady-state heat conduction with the metal liquid above the solid layer; when the cooling water establishes steady state heat conduction with the metal liquid, the following relationship exists between the centrifugal disk and the solid layer:
wherein k is Gold alloy Thermal conductivity, k, of a metal in a solid layer Disk For the thermal conductivity of the centrifugal disk, H Gold alloy Is a set thickness of solid layer metal, H Disk For the thickness of the centrifugal disk surface, T Melting Is the metal melting point temperature, T Fixing device Is the temperature between the solid layer and the surface of the centrifugal disk, T Water and its preparation method The highest temperature of the cooling water.
2. The centrifugal spray forming device of adjustable annular blank radial dimension of claim 1, wherein: the annular baffle plate is matched with the positioning grooves through the fixing parts extending out of the bottom of the annular baffle plate to realize the fixedly connection with the rotating bottom plate.
3. The centrifugal spray forming device of adjustable annular blank radial dimension of claim 2, wherein: the fixing part penetrates through the positioning groove and extends out from the lower part of the rotary bottom plate, and the fixing nut screwed below the fixing part locks the fixing part and the rotary bottom plate.
4. The centrifugal spray forming device of adjustable annular blank radial dimension of claim 2, wherein: the positioning groove is characterized in that adjusting score lines for displaying the diameter of the circumference of the positioning groove are further arranged on two sides of the positioning groove, and marking lines for realizing accurate positioning of the annular baffle plate by matching with the adjusting score lines are further arranged on two sides of the fixing part.
5. The centrifugal spray forming device of adjustable annular blank radial dimension of claim 4, wherein: the annular baffle is of a split type structure formed by splicing the sector baffle and the supporting upright post, the supporting upright post comprises an upper fixing part, a lower fixing part and a supporting part, wherein the lower fixing part penetrates through the positioning groove and is fixedly connected with the rotating bottom plate through a fixing nut, the supporting part is connected with the sector baffle through a concave-convex structure in a matched mode, and the fixing nut screwed on the upper fixing part is pressed on the sector baffle.
6. The centrifugal spray forming device of adjustable annular blank radial dimension of claim 5, wherein: and the two sides of the supporting part are provided with identification lines for realizing the accurate positioning of the annular baffle plate by matching with the adjusting score lines.
7. The centrifugal spray forming device of adjustable annular blank radial dimension of claim 5, wherein: the positioning groove is a through groove with one side open.
8. The centrifugal spray forming device of adjustable annular blank radial dimension of claim 1, wherein: the connecting sleeve is provided with a water inlet hole for conveying cooling water to the cavity of the centrifugal disc and a plurality of water draining holes for draining the cooling water in the centrifugal disc, the water inlet holes are positioned in the middle of the connecting sleeve, and the water draining holes are uniformly distributed around the water inlet holes.
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| CN202210758421.5A CN115121780B (en) | 2022-06-30 | 2022-06-30 | Centrifugal injection forming device capable of adjusting radial dimension of annular blank |
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| CN203304513U (en) * | 2013-05-24 | 2013-11-27 | 辽宁永动力能源材料有限公司 | Full-continuous smelting centrifugal casting device for hydrogen storage alloy |
| CN205110799U (en) * | 2015-11-11 | 2016-03-30 | 广州纳联材料科技有限公司 | Centrifugal device and metal powder preparation facilities |
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|---|---|---|---|---|
| GB519932A (en) * | 1938-08-22 | 1940-04-10 | Joseph Marcel Merle | Improvements relating to a method of making products derived from molten metal |
| GB647368A (en) * | 1947-05-24 | 1950-12-13 | A R D Corp | Means for centering and clamping a flask in position in centrifugal casting machine |
| GB1517283A (en) * | 1974-06-28 | 1978-07-12 | Singer Alec | Production of metal articles |
| KR100882975B1 (en) * | 2007-05-16 | 2009-02-13 | 김부윤 | A centrifugal casting apparatus |
| MX2011000005A (en) * | 2008-06-27 | 2011-08-03 | Ganisation Commonwealth Scient And Ind Res Or | Rotary atomiser for atomising molten material. |
| CN201455223U (en) * | 2009-07-27 | 2010-05-12 | 河南省中原内配股份有限公司 | Combined centrifugal casting mold |
| CN103008599B (en) * | 2012-12-28 | 2014-10-15 | 武昌船舶重工集团有限公司 | Template design method for casting mold of vertical centrifugal machine |
| CN109877299B (en) * | 2019-04-16 | 2021-05-25 | 河南科技大学 | Casting device and casting centrifugal disc |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203304513U (en) * | 2013-05-24 | 2013-11-27 | 辽宁永动力能源材料有限公司 | Full-continuous smelting centrifugal casting device for hydrogen storage alloy |
| CN205110799U (en) * | 2015-11-11 | 2016-03-30 | 广州纳联材料科技有限公司 | Centrifugal device and metal powder preparation facilities |
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