CN108188375B - Double-flange axial flow die casting mould for fan casing - Google Patents
Double-flange axial flow die casting mould for fan casing Download PDFInfo
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- CN108188375B CN108188375B CN201810151591.0A CN201810151591A CN108188375B CN 108188375 B CN108188375 B CN 108188375B CN 201810151591 A CN201810151591 A CN 201810151591A CN 108188375 B CN108188375 B CN 108188375B
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- 238000004512 die casting Methods 0.000 title claims abstract description 42
- 238000005266 casting Methods 0.000 claims abstract description 22
- 229910003460 diamond Inorganic materials 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 5
- 241000886569 Cyprogenia stegaria Species 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- 238000013433 optimization analysis Methods 0.000 abstract 1
- 238000012795 verification Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 230000009471 action Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000003872 anastomosis Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
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Classifications
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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
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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
- B22D17/2272—Sprue channels
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to an alternating current fan, in particular to a double-flange axial flow fan casing die casting die which comprises a fixed die fixing plate, a spiral groove sprue bush, a limiting guide post, a fixed die plate, a wedging block, an inclined guide post, a fixed die core, a quick-change type inner sprue insert, a sliding groove plate, a movable die core, a profile sliding block, a movable die cover plate, a reset rod, a push rod fixing plate, a push plate, a cushion block and a bottom plate. The aluminum alloy casing is an important part of an alternating current fan, and thus a casing die casting mould is one of the most important process equipment in fan production. The die-casting mould of the double-flange shell is used for obtaining the optimal design of a fixed and movable mould parting surface structure and a zero-error first reset mechanism, which has the advantages of clear structure, convenient processing, attractive casting parting surface and no flash, according to practical verification and structural optimization analysis aiming at the interference conditions of the three parting surfaces during the related long-distance core pulling; the problem of twisting off of the inner gate of the center gate is solved satisfactorily by adopting the high-efficiency low-cost spiral groove gate sleeve.
Description
Technical Field
The invention relates to an alternating current fan, in particular to a double-flange axial flow fan shell die-casting die.
Background
The aluminum alloy shell is an important part of the alternating current fan, the casing die-casting mould is thus one of the most important process equipment in fan production. It has been found that side gate molds that attempt to feed from the peripheral frame fail with various deficiencies. Therefore, the frame-type casting consisting of the inner edge and the outer edge is preferably provided with a center gate filled from inside to outside, and the mode of a gate breaking mechanism is more, so that reasonable selection is made. In addition, the determination of the parting surface and the accurate design on the molded part of the die are important to ensure the quality of castings and reduce the maintenance cost of the die.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a die casting die for a double-flange axial flow fan casing.
The technical scheme adopted by the invention for achieving the purpose is as follows:
a die-casting mold for a double-flange axial flow fan shell comprises a fixed die fixing plate, a spiral groove sprue bush, a limiting guide post, a fixed die plate, a wedging block, an inclined guide post, a fixed die core, a quick-change type inner sprue insert, a sliding groove plate, a movable die core, a profile sliding block, a movable die cover plate, a reset rod, a push rod fixing plate, a push plate, a cushion block and a bottom plate;
when the fixed die is installed: four limit guide posts are arranged on the fixed die fixing plate; the fixed template is provided with a guide sleeve; the fixed die fixing plate is pressed into the spiral groove sprue bush; two wedging blocks, four inclined guide posts, the fixed mold core and the quick-change type inner gate insert are matched on the fixed mold plate; the fixed die plate is sleeved into the fixed die fixing plate after being aligned with the corresponding four limit guide posts, four nuts are screwed on, and the fixed die assembly is finished;
when the movable mould is installed: the sliding groove plate is internally provided with the movable mold core, and the sliding grooves on two sides are internally provided with the profile sliding blocks; the movable die cover plate is closed, and two positioning pins are knocked in to connect the movable die cover plate and the chute plate into a whole; all push rods and the reset rod are inserted into the push rod fixing plate, the push plate is covered, and the push-out parts are connected into a whole by adopting screws; the push-out part assembled into a whole is inserted into the corresponding hole of the chute plate; placing the cushion block, covering the bottom plate, and after locking the fastening screw, finishing the assembly of the movable mould;
when the die is assembled: and the appearance sliding block faces upwards, and after the heads of the four inclined guide posts of the fixed die are aligned with the four inclined guide post holes of the appearance sliding block, the whole die assembly is completed.
Optionally, when the casing casting is pushed out: the piston rod of the ejection cylinder of the die casting machine pushes a push plate connecting rod, the push plate connecting rod pushes the push plate, and the push plate pushes all push rods comprising the reset rod to push the shell castings out.
Optionally, the shell casting comprises an inner edge cross end cover and an outer edge tetragonal frame; the center of the inner edge cross fork end cover is provided with a bearing hole groove, the periphery of the bearing hole groove is provided with an inner edge groove, the periphery of the inner edge groove is connected with the outer edge square frame through four connecting ribs, and the front side surface and the rear side surface of the outer edge square frame are respectively provided with an outer edge groove.
Optionally, the die-casting mold further comprises a bearing hole core, an inner edge push rod, a connecting rib push rod and an outer edge push rod;
when the casing casting is pushed out: the bearing Kong Xingxin is abutted against the bearing hole groove; the inner edge push rod is abutted on the inner edge groove; the connecting rib push rods are abutted against the four connecting ribs; the outer edge push rod is abutted on the outer edge groove.
Optionally, the four connecting ribs are three diamond spokes and one U-shaped wire outlet rib respectively.
Optionally, three spiral grooves are milled on the inner wall of the spiral groove sprue bush.
Optionally, the two profile sliding blocks are connected in a convex-concave embedded type positioning mode.
Optionally, a gap is reserved between the inclined guide post and the inclined guide post hole of the profile slider along the core pulling direction.
Optionally, before die assembly: the piston rod of an ejection cylinder of the die casting machine is withdrawn in advance, and a push plate connecting rod rigidly connected with the piston rod is used for pulling the push rod fixing plate along with the withdrawal of the piston rod, and the push rod fixing plate drives all push rods to withdraw to the original position.
Optionally, at the end of die closing: the right end face of the reset rod on the push rod fixing plate is matched with the left large plane of the fixed die plate, so that all push rods are guaranteed to return to the bottom.
Compared with the prior art, the invention has the beneficial effects that:
the die casting mould provided by the invention adopts a central gate, and the feeding characteristic of the die casting mould is that the metal flow is filled from the inner edge end cover through the outer edges of four connecting ribs, so that the four connecting ribs serve as the inner gate of an outer edge entity. In addition, the center gate can obtain minimum pressure loss, and the filling capacities of the four connecting ribs are equal, so that the surface quality of the obtained shell is satisfactory;
the rigidity first reset mechanism adopted by the invention has the advantages of good working reliability, convenient operation and low cost;
the quick-change type inner gate insert is used for solving the problem that a straight runner is difficult to pull out a taper hole due to the fact that a broken part of an inner gate of a fixed mold core is easy to damage to form a back taper, and can be conveniently repaired and replaced;
the invention adopts the spiral groove sprue bush to solve the problem of how to smoothly break the residual materials of the pressing chamber and the sprue gate of the sprue gate.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
FIG. 1 is a perspective view of a housing according to an embodiment of the invention;
FIG. 2 is a top view and A-A and C-direction views of a chassis according to an embodiment of the present invention;
FIG. 3 is a bottom view of a housing and a B-B view thereof according to an embodiment of the present invention;
FIG. 4 is a full cross-sectional view of a die-casting mold for a dual flange axial flow fan housing in accordance with an embodiment of the present invention;
FIG. 5 is a perspective view of a stationary mold core according to an embodiment of the present invention;
FIG. 6 is a top view and A-and B-side views of a stationary mold core according to an embodiment of the present invention;
FIG. 7 is a full cross-sectional view of a stationary mold core according to an embodiment of the present invention;
FIG. 8 is a perspective view of a moving mold core according to an embodiment of the present invention;
FIG. 9 is a top view of a moving mold core and its A-and B-side views according to an embodiment of the present invention;
FIG. 10 is a full cross-sectional view of a moving mold core according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a prior art spring-first reset mechanism;
fig. 12 is a schematic view of a prior art wedge swing lever type first reset mechanism, wherein (a) is a schematic view after reset and (b) is a schematic view before die assembly;
FIG. 13 is a block diagram of a push plate coupling lever according to an embodiment of the present invention;
FIG. 14 is a schematic view of a first parting of a die-casting mold according to an embodiment of the invention;
FIG. 15 is a top view and cross-sectional view of a spiral groove sprue bush according to an embodiment of the present invention;
FIG. 16 is a diagram of an embodiment of the present invention schematic diagram of first parting of die casting mold;
FIG. 17 is a perspective view of a contoured slider according to one embodiment of the present invention;
FIG. 18 is a top view, front view and side view of a contoured slider in accordance with one embodiment of the present invention.
In the figure, a fixed die fixing plate is 1-arranged; 2-wedging blocks; 3-a fixed template; 4-oblique guide posts; 5-Kong Xingxin; 6-profile slide; 7-a spiral groove sprue bush; 8-bearings Kong Xingxin; 9-fixing the mold core; 10-moving mold cores; 11-a fixed die guide sleeve; 12-limiting guide posts; 13-guiding sleeve; 14-a movable mould guide post; 15-a chute plate; 16-an outer hexagonal nut; 17-a movable mould cover plate; 18-cushion blocks; 19-locking nut; 20-opening gasket; 21-push plate coupling rod; 22-push plate guide sleeve; 23-a push plate guide post; 24-inner edge push rod; 25-connecting bar push rod; 26-an outer edge pushrod; 27-a push rod fixing plate; 28-pushing plate; 29-a reset lever; 30-a bottom plate; 31-fastening a screw; 32-quick change in-gate insert; 33-a return spring; 34-push rod; 35-a reset lever; 36-pushing plate; 37-push rod fixing plate; 38-swinging rod; 39-moving die cover plate; 40-pushing rod; 41-wedge bar; 100-a shell; 101-diamond-shaped connecting ribs; 102-U-shaped connecting ribs; 103-bearing hole slots; 104-inner edge groove; 105-an outer edge groove; 106-threaded holes.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1 to 3, the cabinet is made of YL102 aluminum silicon alloy material. The composite structure consists of two parts, namely an inner edge cross fork end cover and an outer edge square frame. The inner and outer edges are connected into a whole by three 14 multiplied by 6 diamond spokes and a U-shaped wire outlet rib.
In order to meet various installation occasions of users, the fan adopts double-sided square frames (commonly called double flanges), so that the difficulty of designing and manufacturing the die and the maintenance cost are greatly increased (because the die at the moment is required to be designed into a two-slide-block outer core pulling mechanism as shown in fig. 4), but the structure is attractive in appearance, and the fan is convenient to use and accords with international trend.
Because the bearing chamber of the fan is positioned at the center of the inner edge, the bearing chamber must be subjected to subsequent turning and rolling processing in order to ensure the precision requirement of the bearingCan meet the requirements of the dimensional accuracy and the surface hardness. Therefore, the defects of air holes, shrinkage cavities and the like are not strictly ensured, and the compactness and the mechanical strength of the die casting tissue are ensured.
As can be seen from fig. 4, the pouring system adopts a central gate, and the feeding characteristic is that the metal flow is filled from the inner edge end cover through the outer edges of four connecting ribs, so that the four connecting ribs serve as the inner gate of the outer edge entity. In addition, the center gate can obtain minimum pressure loss, and the filling capacity of the four connecting ribs is equal. Calculation and practice prove that the filling can be successfully completed without adding an auxiliary pouring gate, the surface quality of the shell is satisfactory.
As can be seen from the three-dimensional view of the shell, the mould is provided with an auxiliary parting surface B at the minimum projection surface of the inner cavity of the outer frame of the shell except the main parting surface A, and the auxiliary parting surface C is required to be additionally arranged at the middle symmetrical position of the cross section of the connecting ribs because the end surfaces of the three connecting ribs are diamond-shaped.
In order to achieve the above analysis on the mold structure, the positions on the fixed mold core and the movable mold core are designed as shown in fig. 5 to 10 with respect to the three parting surfaces in fig. 1. When the die is closed, A Dynamic movement And A is a Fixing device 、B Fixing device And B is connected with Dynamic movement 、C Fixing device And C Dynamic movement One-to-one anastomosis. The matched cone to which the auxiliary parting surface B, C belongs takes an inclination of 8 degrees, so that when the convex part of the movable mold core is inserted into the concave part of the fixed mold core, the mold clamping precision is ensured, and stable anastomosis in thousands of times of mold clamping can be effectively ensured. This parting surface has the following advantages: (1) The fixed mold core and the movable mold core have relatively equal strength at the joint part with intersection; (2) The parting surface joint part of the fixed mold core and the movable mold core is convenient to process, and can be finished by a common tool milling machine; (3) The surface nitriding treatment process is adopted for the molded part of the die, so that the molded part can be directly processed and matched in place, and the problem of die clamping precision reduction caused by heat treatment deformation is avoided; (4) As can be seen from the A-direction view and the B-direction view of fig. 6 and 9, the joint profile of the connecting rib adopts 8-degree wedge-shaped concave-convex combination, thereby ensuring two lobes of the connecting ribThe joint surface has no dislocation (the width is only slightly wider than the diamond section to meet the strength requirement).
As can be seen from fig. 4, when the fixed mold is installed: the die frame adopts an outsourcing standard die frame, four limit guide posts 12 are arranged on the fixed die fixing plate 1, two groups of 8 guide sleeves are arranged on the fixed die plate 3, and the die frame comprises a fixed die guide sleeve 11 and a guide sleeve 13. The fixed die fixing plate 1 is pressed into the spiral groove sprue bush 7, two wedging blocks 2, four inclined guide posts 4, a fixed die core 9 (comprising four hole cores 5) and a quick-change type inner sprue insert 32 are matched into the fixed die plate 3, the fixed die plate is sleeved into the fixed die fixing plate 1 after being aligned with the corresponding four limit guide posts 12, and the fixed die part is completed after four outer hexagon nuts 16 are screwed;
when the movable mould is installed: a movable mould core 10 (a large core containing a bearing hole core 8) is arranged in the chute plate 15, and profile sliding blocks 6 are arranged in the sliding grooves at the two sides, wherein the profile sliding blocks 6 are noted to stay at the positions where the four inclined holes are just aligned with the heads of the four inclined guide posts 4 of the fixed mould; closing the movable die cover plate 17, knocking in two positioning pins and locking socket head cap screws so that the movable die cover plate 17 and the chute plate 15 are integrated; all push rods and reset rods 29 are inserted into the push rod fixing plate 27, the push plate 28 is covered, and socket head cap screws are locked in corresponding screw holes, so that the push-out components are integrated; inserting the push-out member assembled into the corresponding hole of the chute plate 15; placing the cushion block 18, covering the bottom plate 30, locking two groups of 6 fastening screws 31, and finishing the assembly of the movable mould;
when the die is assembled: the outline slide block 6 faces upwards, the heads of the four inclined guide posts 4 of the fixed die are aligned with the four inclined holes of the outline slide block 6 of the movable die, the plumb bob is put in, and the whole die assembly is completed.
Because the piston rod of the ejection cylinder of the die casting machine is rigidly connected with the push plate 28 through the push plate connecting rod 21 as shown in fig. 4, the ejection process of the die casting of the shell is as follows: the piston rod of the ejection cylinder of the die casting machine pushes the push plate connecting rod 21, the phi 30 step of the push plate connecting rod 21 pushes the push plate 28, and the push plate 28 pushes all push rods (comprising the reset rod 29) to push the shell casting out; the piston rod of the ejection cylinder of the die casting machine before die assembly is retracted, and the push plate connecting rod 21 rigidly connected with the piston rod is pulled by the locking nut 19 and the opening gasket 20 to pull the push rod fixing plate 27, and the push rod fixing plate 27 drives all push rods (comprising the reset rod 29) to retract to the original position along with the retraction of the piston rod; at this time, the mold closing is started, and when the mold closing is completely finished, that is, the parting surfaces II-II are completely matched, the right end faces of the four reset rods 29 positioned on the push rod fixing plate 27 are also matched with the left large plane of the fixed mold plate 3, so that all push rods are ensured to return to the bottom, and the reset rods 29 play a role in precisely positioning the push-out mechanism.
Referring to fig. 2 and 4, the casing casting includes an inner cross-piece end cap and an outer square frame; the center of the inner edge cross end cover is provided with a bearing hole groove 103, an inner edge groove 104 is formed at the periphery of the bearing hole groove 103, the periphery of the inner edge groove 104 is connected with the outer edge square frame through four connecting ribs (comprising three diamond connecting ribs 101 and one U-shaped connecting rib 102), outer edge grooves 105 are formed in the front side surface and the rear side surface of the outer edge square frame, and threaded holes 106 are formed in the periphery of the outer edge groove 105. Further, the die-casting mold further comprises a bearing Kong Xingxin, an inner edge push rod 24, a connecting rib push rod 25, an outer edge push rod 26 and a hole core 5; when the casing casting is pushed out: the bearing hole core 8 is abutted against the bearing hole groove 103; the inner edge push rod 24 is abutted against the inner edge groove 104; the connecting rib push rods 25 are abutted against the four connecting ribs; the outer edge push rod 26 is abutted against the outer edge groove 105, the hole core 5 is connected with the threaded hole 106, and the threaded hole 106 is formed to facilitate the installation of the casing casting by a user.
Referring to fig. 5 to 10, the cross-sectional view a in fig. 6 corresponds to the cross-sectional view a in fig. 9, and the cross-sectional view a coincide with each other to form U-shaped connecting ribs by casting, wherein the number of the U-shaped connecting ribs is one; the cross section B in FIG. 6 corresponds to the cross section B in FIG. 9, and the two cross sections are matched to be poured into a diamond-shaped connecting rib, and the number of the diamond-shaped connecting ribs is three.
In the inclined guide post side core pulling mechanism, the inclined guide post is most commonly fixed on a fixed die, and a lateral sliding block is arranged on a movable die side, so that interference phenomenon between the lateral sliding block and a push rod in the die assembly resetting process must be strictly prevented. The possibility of interference of the lateral slide core with the push rod arises in the case of a coincidence of the projections of the two on a plane (parting plane) perpendicular to the direction of the opening and closing die. As shown in fig. 4, in the mold closing process, the oblique guide post 4 is inserted into the oblique hole of the profile slide 6 to reset the profile slide 6 to the inside of the mold, and at this time, the reset lever of the mold pushing mechanism does not push the push rod to the original position, so that the interference phenomenon that the profile slide 6 collides with the outer edge push rods 26 (8 in total) is inevitably generated. To solve this unavoidable problem, the spring-type first-reset mechanism and the wedge-bar swing-lever-type first-reset-lever mechanism are most commonly used conventionally.
(1) Spring type first reset mechanism
As shown in fig. 11, the return spring 33 is mounted on the return rod 35 in a compressed manner, when the ejector pin of the injection molding machine is out of contact with the push plate of the mold during mold clamping, the push rod fixing plate is retracted by the restoring force of the return spring 33, and all the push rods 34 mounted on the push rod fixing plate are returned to the initial position.
(2) Wedge rod swing rod type first reset rod mechanism
As shown in fig. 12, when the wedge-bar swinging rod type first-reset rod mechanism is used for die assembly, the wedge bar 41 mounted on the fixed die fixing plate 1 pushes the swinging rod 38 provided with the roller, so that the swinging rod 38 is forced to rotate anticlockwise around the rotating shaft, and simultaneously, the pushing plate 36 is pushed to move leftwards, so that the reset of the pushing rod 40 is prior to the reset of the side core-pulling slide block. And (b) the state that the wedge rod is not contacted with the swing rod in the mold closing process.
In the two structures, when the push rod is slightly bent and deformed to prevent the movement of the push-out mechanism, the return spring is in weak state to complete the return of the push-out mechanism due to the sudden increase of resistance, and the return spring is easy to fail; the wedge rod of the latter belongs to a cantilever beam member, when the inclined plane pushes the idler wheels and the idler wheels push the push plates, if the number of the push rods is large, especially the push rods have the resistance increasing condition such as bending deformation, the wedge rod is bent and upwarped and even broken, and the problem of loosening of the wedge rod swinging rod type first reset rod mechanism is easily caused. The two structures have the common defects of short service life, high risk and high maintenance cost, and are not suitable for the occasions with poor use environments such as die-casting molds.
On the basis of summarizing the drawbacks, the prior reset mechanism shown in fig. 4 has been practically proven to be a zero-risk solution with simple structure, convenient operation and no maintenance. The operation method of the structure adopted by the invention is as follows: (1) two push plate connecting rods 21 (shown in figure 13) respectively penetrate through the movable die plate of the die casting machine, and the left end threaded part is screwed into the corresponding screw holes of the push rod connecting plate of the die casting machine; (2) when the two push plate connecting rods 21 are aligned with the corresponding two holes of the die bottom plate 30, the die casting movable die plate is driven to move right to lean against, and the top plate of the ejection cylinder is controlled to extend out, so that the two push plate connecting rods 21 connected with the die connecting rods penetrate through the corresponding two holes of the die push plate 28, and after the two push plate connecting rods are abutted against the corresponding two holes, the opening gaskets 20 are respectively inserted into threads at the right ends of the push plate connecting rods 21, and the locking nuts 19 are screwed.
When the die is connected with the ejection cylinder of the die casting machine through the reset mechanism, the push rod of the die is pulled back to the initial position along with the withdrawal of the ejection cylinder of the die casting machine every time the die is pushed out once. It is worth comparing and emphasizing that the reliability of the rigid reset mechanism is achieved in all cases, and the operation is convenient and the cost is low.
The central gate reduces the projection area of the casting on the die and the parting surface of the pouring system to the greatest extent, and has the advantages of less pressure loss of the shortest molten metal flow and omission of the cross gate. The molten aluminum alloy is directly injected into the cavity through the sprue flow, so that the mold has the advantages of small flow resistance, convenience in eliminating gas which is difficult to exhaust in the depth of the cavity, smooth exhaust, compact structure, uniform compression bearing and injection force of the mold and the like. In view of the difficulty in pulling out the taper hole of the sprue and the influence on the flatness of the right end face of the inner edge cross end cover caused by the fact that the sprue fracture part of the fixed mold core 9 is easy to damage and form a back taper, the quick-change type inner gate insert 32 is tightly matched so as to be convenient to repair and replace.
The most trouble is how to press after the mold is opened and the problem of smooth fracture of the chamber excess material and the sprue in the sprue is solved. As shown in fig. 14, the I-I parting surface at the fixed mold is first opened during mold opening, because three spiral grooves are milled in the inner wall of the sprue bush (shown in fig. 15), the right pulling force generated by the cold pressing chamber residual material and the left packing force of the core on the casting are in a balanced state, the inner gate is simultaneously broken under the action of the mold opening force, and after the mold opening is finished, the injection punch is opened again to quickly move left, so that the gate residual material in the pressing chamber is pushed out along the direction of the spiral grooves and falls down. In one of the breaking modes of the inner gate, the spiral groove is not milled on the gate sleeve, as shown in fig. 16, the I-I parting surface needs to be stopped after the die is opened, at the moment, the gate residual material is dragged out of the gate sleeve along with the straight runner and abuts against the right side of the fixed die core, and the die can be continuously opened until the II-II parting surface is completely opened after the gate residual material is knocked down by means of external force such as a hand hammer.
As shown in fig. 4, the injection punch presses the molten aluminum alloy into the spiral groove sprue bush 7 of the die through the cold pressing chamber of the die casting machine, and then the molten aluminum alloy is injected into the die cavity through the center sprue direct-current channel, pressurized (the die is solidified under high pressure), cooled, and then the die is opened. The I-I parting surface is opened, the shell casting and the gate residual material are forcibly separated at the inner gate under the torsion action of three spiral grooves in the spiral groove gate sleeve 7, and the residual material left in the spiral groove gate sleeve 7 is knocked down by a restarting pressing punch; and continuing to open the die, wherein the parting surface of the die II-II is opened, and the molding part of the profile sliding block 6 generating the packing force is deeply embedded between the two flanges of the shell because the profile sliding block 6 is positioned on the movable die, so that a gap of 2mm is reserved between the inclined guide post 4 and the inclined hole of the profile sliding block 6 along the core pulling direction in order to avoid the damage of the die caused by the simultaneous parting of the parting surface II-II and the profile sliding block 6, so that when the movable die is initially parting by a distance of 2/sin25 DEG=4.73 mm, the inclined hole of the profile sliding block 6 is contacted with the inclined guide post 4, and then the core pulling action is started, and the purpose is that the core pulling action of the profile sliding block 6 lags behind the main parting of the fixed die and the movable die, so that the inclined surface of the profile sliding block 6 has the opportunity to be separated from the compression of the inclined surface of the wedging block 2. Depending on the inclined hole, the profile sliding block 6 performs inclined core pulling movement along the inclined guide post 4, and when the profile sliding block 6 is separated from the inclined guide post 4, the core pulling movement is finished. At this time, the front molding section of the profile slider 6 has also been separated from the housing casting. And the die is continuously opened to the bottom, because the piston rod of the ejection cylinder of the die casting machine is rigidly connected with the die through the push plate connecting rod 21, after the casting of the shell is ejected, the push plate of the die is driven to return to the original position when the ejection cylinder returns, so that the ejector rod is reset firstly (the collision between the profile sliding block 6 and 8 outer edge push rods 26 which do not exit from an interference area when the die is closed is avoided). After that, the movable mold is moved forward as usual to mold, the profile slider 6 is also moved obliquely along the oblique guide post 4, and when the main parting surface of the mold is reliably closed, the inclined surface of the profile slider 6 is also locked by the inclined surface of the wedge block 2, and at this time, the profile slider 6 is also properly engaged by the slit of the wire cut to ensure that the cavity (i.e., the housing profile) formed by the profile sliders 6 on both sides is not dislocated, as shown in fig. 17 and 18. The next cycle can be entered by repeating the above operations.
The die casting mold for the double-flange axial flow fan casing provided by the invention has the following characteristics:
(1) The mold structure (shown in fig. 4) is simple, the spiral groove sprue bush 7 serving as a key part is simple in structure and excellent in twist-off effect, and is extremely convenient to manufacture and replace;
(2) The inner gate fracture part of the fixed die core 9 is tightly matched with a quick-change inner gate insert 32 so as to facilitate quick repair and replacement when the inner gate fracture part of the fixed die core 9 is damaged to form a back taper;
(3) Due to the adoption of the center gate, the tissue density at the bearing chamber at the inner edge of the shell is high. The bearing chamber is a position where the molten material arrives at first, and is directly subjected to the action of pressurization before solidification, so that the defects of air holes and the like can not occur after turning, the hole pitch is stable in size, and the consistency of castings is good;
(4) Degating is relatively simple. The pouring gate is cut off only by clamping with soft claws on a lathe;
(5) The waste is less. The total weight of center gate trim and overflow scrap is very light (only 30 grams) except for normal gate sleeve cake;
(6) The shell has high density, no defect in appearance, and long service life of working parts such as a sliding block, a core and the like;
(7) After the whole processing of the two outer slide blocks 6 is finished, the two outer slide blocks 6 are cut according to a linear cutting section line shown in fig. 18, and 60-degree convex-concave embedded positioning is formed at the joint part of the two outer slide blocks, so that the two outer slide blocks 6 are correctly matched according to the cutting slots during die assembly, and the cavity (namely the shell shape) formed by the two outer slide blocks 6 is ensured not to be misplaced.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (8)
1. The die casting mold for the double-flange axial flow fan shell is characterized by comprising a fixed die fixing plate, a spiral groove sprue bush, a limiting guide post, a fixed die plate, a wedging block, an inclined guide post, a fixed die core, a quick-change type inner sprue insert, a sliding groove plate, a movable die core, a profile sliding block, a movable die cover plate, a reset rod, a push rod fixing plate, a push plate, a cushion block and a bottom plate;
when the fixed die is installed: four limit guide posts are arranged on the fixed die fixing plate; the fixed template is provided with a guide sleeve; the fixed die fixing plate is pressed into the spiral groove sprue bush; two wedging blocks, four inclined guide posts, the fixed mold core and the quick-change type inner gate insert are matched on the fixed mold plate; the fixed die plate is sleeved into the fixed die fixing plate after being aligned with the corresponding four limit guide posts, four nuts are screwed on, and the fixed die assembly is finished;
when the movable mould is installed: the sliding groove plate is internally provided with the movable mold core, and the sliding grooves on two sides are internally provided with the profile sliding blocks; the movable die cover plate is closed, and two positioning pins are knocked in to connect the movable die cover plate and the chute plate into a whole; all push rods and the reset rod are inserted into the push rod fixing plate, the push plate is covered, and the push-out parts are connected into a whole by adopting screws; the push-out part assembled into a whole is inserted into the corresponding hole of the chute plate; placing the cushion block, covering the bottom plate, and after locking the fastening screw, finishing the assembly of the movable mould;
when the die is assembled: the appearance sliding block faces upwards, and after the heads of the four inclined guide posts of the fixed die are aligned with the four inclined guide post holes of the appearance sliding block, the whole die assembly is completed;
when the casing casting is pushed out: the piston rod of an ejection cylinder of the die casting machine pushes a push plate connecting rod, the push plate connecting rod pushes the push plate, and the push plate pushes all push rods comprising the reset rod to push the shell castings out;
and three spiral grooves are milled on the inner wall of the spiral groove sprue bush.
2. The die casting mold of a double flange axial flow fan housing of claim 1, wherein the housing casting comprises an inner cross end cap and an outer square frame; the center of the inner edge cross fork end cover is provided with a bearing hole groove, the periphery of the bearing hole groove is provided with an inner edge groove, the periphery of the inner edge groove is connected with the outer edge square frame through four connecting ribs, and the front side surface and the rear side surface of the outer edge square frame are respectively provided with an outer edge groove.
3. The die casting mold of the double flange axial flow fan casing according to claim 2, comprising a bearing hole core, an inner edge push rod, a coupling rib push rod and an outer edge push rod;
when the casing casting is pushed out: the bearing Kong Xingxin is abutted against the bearing hole groove; the inner edge push rod is abutted on the inner edge groove; the connecting rib push rods are abutted against the four connecting ribs; the outer edge push rod is abutted on the outer edge groove.
4. The die casting mold of the double flange axial flow fan casing according to claim 2, wherein the four connecting ribs are three diamond spokes and one U-shaped wire outlet rib respectively.
5. The die casting mold of the double flange axial flow fan casing according to claim 1, wherein the two profile sliders are connected by a convex-concave embedded positioning.
6. The die casting mold of the double flange axial flow fan casing according to claim 1, wherein a clearance is reserved between the inclined guide post and the inclined guide post hole of the profile slider along the core pulling direction.
7. The die casting mold of the double flange axial flow fan housing according to claim 1, wherein before die assembly: the piston rod of an ejection cylinder of the die casting machine is withdrawn in advance, and a push plate connecting rod rigidly connected with the piston rod is used for pulling the push rod fixing plate along with the withdrawal of the piston rod, and the push rod fixing plate drives all push rods to withdraw to the original position.
8. The die casting mold of the double flange axial flow fan casing according to claim 1, wherein at the end of the mold closing: the right end face of the reset rod on the push rod fixing plate is matched with the left large plane of the fixed die plate, so that all push rods are guaranteed to return to the bottom.
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