CN210387460U - Wind-powered electricity generation main shaft metal mold and casting system - Google Patents

Wind-powered electricity generation main shaft metal mold and casting system Download PDF

Info

Publication number
CN210387460U
CN210387460U CN201920906522.6U CN201920906522U CN210387460U CN 210387460 U CN210387460 U CN 210387460U CN 201920906522 U CN201920906522 U CN 201920906522U CN 210387460 U CN210387460 U CN 210387460U
Authority
CN
China
Prior art keywords
main shaft
metal mold
parting
wall thickness
casting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201920906522.6U
Other languages
Chinese (zh)
Inventor
季虎
王卫国
赵龙
陆志刚
顾显洪
赵栋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Jixin Wind Energy Technology Co Ltd
Original Assignee
Jiangsu Jixin Wind Energy Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Jixin Wind Energy Technology Co Ltd filed Critical Jiangsu Jixin Wind Energy Technology Co Ltd
Priority to CN201920906522.6U priority Critical patent/CN210387460U/en
Application granted granted Critical
Publication of CN210387460U publication Critical patent/CN210387460U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model relates to a wind-powered electricity generation main shaft metal mold and casting system, the metal mold includes upper and lower parting, the interior outer wall of upper and lower parting junction has set up ladder parting and sand supplementation recess respectively to effectively control the shooting case problem that the parting brought, the metal mold has the wall thickness that changes along with the shape, makes the shrinkage porosity phenomenon of main shaft foundry goods obtain effective control; the casting system comprises the metal mold, the mud core and a pouring system, wherein the pouring system is provided with a sprue, a socket, an inner pouring gate and a riser, and the inner pouring gate is a batch seam channel and can effectively control slag inclusion in an R-angle area of the main shaft; by adjusting the shape of the upper part of the mud core, the main shaft obtains increased wall thickness on the upper part, thereby prolonging the feeding time and further inhibiting the problem of shrinkage porosity.

Description

Wind-powered electricity generation main shaft metal mold and casting system
Technical Field
The utility model relates to a casting processing field, concretely relates to wind-powered electricity generation main shaft metal mold and casting system.
Background
The wind energy industry in China is rapidly developed after a large stride in the past years, the macro targets of the current industry development are adjusted, and the development emphasis is gradually shifted from scale improvement to quality improvement and efficiency improvement and the advance of the technology. Wind power castings with high power, high performance and low cost become the direction of market demand. The main shaft is used as one of key parts of the wind generating set, the manufacturing method of the main shaft is mostly forging, the part material is forged steel, and as the price of the forging is far higher than that of a casting, some domestic and foreign complete machine manufacturers change the main shaft from the forging into the casting to reduce the cost.
At present, the mainstream wind power main shaft casting materials are common nodular cast iron EN-GJS-400-18-LT, the process route is conventional sand casting, the shrinkage porosity problem of the main shaft produced by the method is difficult to completely solve, the casting structure is not compact enough, and the defects of pinholes and the like are easily formed on the processing surface. Some high-end customers have higher requirements on the internal quality, the tissue density and the material performance of castings, which requires that new materials and new technological methods with high performance are continuously explored, and the metal mold casting process of the main shaft of the new material EN-GJS-500-14U (see European standard EN1560-2011) is proposed.
Metal mold casting, also known as die casting, is widely used because of its high strength, smooth surface, and reusability. The design of the metal mold needs to consider three main factors, namely, the proper chilling effect is taken into consideration to reduce the shrinkage porosity tendency of the casting as much as possible; convenience in manufacture and use; and thirdly, the strength requirement is met. The means commonly adopted in the prior art to meet the requirements are as follows: the wall thickness of the metal mold is selected according to the size of the workpiece so as to meet the strength requirement, and the inner and outer chilling blocks are additionally arranged so as to meet the chilling requirement. However, from the actual casting effect, for large castings such as wind power main shafts and the like, the above means cannot effectively eliminate the problem of shrinkage porosity of the castings, and only can change the position of the shrinkage porosity.
In addition, the problem of slag inclusion is always obvious when a metal mold is used for casting large-scale workpieces. Although surface defects caused by slag inclusions can be removed by subsequent machining, a serious slag inclusion problem requires that a sufficient machining allowance must be reserved for a workpiece in the design and casting processes, which causes waste of casting materials and complication of the subsequent machining processes, thereby resulting in an increase in cost.
Disclosure of Invention
For solving the problem that exists among the prior art, the utility model provides a wind-powered electricity generation main shaft metal mold and casting system.
Specifically, the utility model provides a following scheme: a wind power main shaft metal mold comprises an upper mold and a lower mold, wherein the upper mold is used for forming a casting space of a main shaft small end, the lower mold is used for forming a casting space of a main shaft large end, and the upper mold and the lower mold can be overlapped and assembled to form a complete casting space of a main shaft; the metal mold has a wall thickness that varies continuously in the axial direction, and when the metal mold is placed vertically, the ratio of the wall thickness of the metal mold to the wall thickness of the cast main shaft is a constant value between 0.5 and 1.5 in any cross section.
Preferably, the ratio is 1.1.
Preferably, flanges are arranged at the upper and lower parting ends of the metal mold, and a plurality of bolt holes are arranged on the flanges; at least two positioning holes are respectively formed in the upper and lower parting contact two flanges, so that the upper and lower parting positioning and mounting can be realized by using a pin; the inner edges of the upper and lower parting contact two turnups are respectively provided with a parting groove and a parting bulge to form step parting; sand supplementing grooves are also formed in the outer edges of the two turnups which are in up-and-down parting contact; the ladder type is in coordination with the sand supplementing groove, so that the occurrence of shooting is avoided. The outer edge of at least the upper flanging of the upper-lower parting is fixedly provided with a hanging shaft, and preferably, at least four hanging shafts are arranged on each upper flanging.
Preferably, the parting groove is formed on the lower parting.
Preferably, the outer wall of the metal mold is provided with reinforcing rib plates, and each reinforcing rib plate comprises a plurality of vertical rib plates arranged along the axial direction and a plurality of transverse rib plates arranged along the circumferential direction.
The utility model also provides a wind power main shaft casting system, which comprises the metal mold, the mud core and the pouring system; the mud core is positioned in the metal mold and coaxially arranged, and a casting cavity is formed between the outer surface of the mud core and the inner surface of the metal mold; the middle part of the mud core is provided with the core bar, and the core bar can increase the strength of the mud core and reduce the weight of the mud core; an air outlet rope is wound on the core rod and used for exhausting mud cores; the pouring system comprises a sprue, a socket, an inner pouring gate and a riser; the straight pouring channel is arranged in the core rod and axially extends through the mud core, the socket seat is positioned at the bottom of the straight pouring channel and is in fluid communication with the straight pouring channel, and the socket seat comprises a smaller-diameter primary buffer groove positioned at the lower part and a larger-diameter secondary buffer groove positioned at the upper part; preferably, the primary buffer groove and the secondary buffer groove are both circular; the inner pouring gate is positioned at the bottom of the mud core and communicated with the secondary buffer groove and the outer edge of the casting cavity; and the riser is arranged at the top of the casting cavity.
Preferably, the inner gate is a plurality of circular tubes arranged around the outer edge of the secondary buffer groove.
Preferably, the inner gate is a slit which is a slit-shaped channel disposed around the periphery of the secondary buffer tank.
Preferably, the batch gap is communicated with the outer edge of the casting, and the communication part is provided with a buffer.
Preferably, the mud core part corresponding to the upper parting has a diameter smaller than the designed inner diameter of the wind power main shaft, so that the wind power casting obtains a wall thickness increased from the designed amount. The design prolongs the feeding duration in the feeding channel, increases the feeding amount and excellently reduces the shrinkage porosity phenomenon. The increased wall thickness compared to the design amount can be removed at a later stage by means of grinding or the like.
Preferably, the wall thickness increased compared with the design amount is gradually increased from bottom to top, and meanwhile, the wall thickness change of the wind power main shaft at the upper and lower parting positions has continuity. In other words, at the upper and lower parting joint, the increased wall thickness is zero.
Compared with the prior art, the utility model at least has the following advantages: the metal mold is set to have the wall thickness which changes along with the shape, so that the shrinkage problem of the main shaft casting is effectively controlled; the metal mold is divided into an upper mold and a lower mold, so that the manufacturing, the transportation and the painting of the inner wall of the metal mold are more convenient, meanwhile, the inner wall of the joint of the upper mold and the lower mold is provided with a step mold, the outer wall of the joint of the upper mold and the lower mold is provided with a sand supplementing groove, and the probability of the occurrence of the problem of box injection is effectively reduced by the cooperation of the upper mold and the lower; the nest seat and the casting cavity are connected by adopting the batch gap channel, so that the slag inclusion problem is effectively controlled, and the occurrence position of the slag inclusion problem is limited in an R-angle area of the main shaft; the shrinkage porosity is further controlled by innovatively increasing the wall thickness of the upper part of the main shaft.
Drawings
FIG. 1 is a top view of the upper split type;
FIG. 2 is a sectional view taken along line A-A of the upper mold;
FIG. 3 is a partial enlarged view of area A;
FIG. 4 is a top view of the lower parting;
FIG. 5 is a sectional view taken along line B-B of the lower mold;
FIG. 6 is a schematic view of a gating system;
FIG. 7 is a partial enlarged view of region B;
FIG. 8 is a schematic view of a socket;
FIG. 9 is a schematic view of a spindle having an increased wall thickness;
FIG. 10 is a three-dimensional structure of the main axis of Vestas MK 3B;
in the figure: the sand supplementing device comprises an upper parting 1, a lower parting 2, a flanging 3, bolt holes 4, positioning holes 5, a sand supplementing groove 6, a vertical rib plate 7, a transverse rib plate 8, a hanging shaft 9, a casting cavity 10, a sprue 11, a mud core 12, a riser 13, a gas outlet 14, a sand supplementing core head 15, a socket 16, a batch seam 17, a primary buffer groove 18 and a secondary buffer groove 19.
Wherein: the hatched triangle in fig. 9 is the region of increased wall thickness.
Detailed Description
Example 1
1-5, a wind power main shaft metal mold is used for casting a Vestas MK3B main shaft. The structure of the main shaft of the VestasMK3B is shown in FIG. 10, and the basic parameters are shown in Table 1:
TABLE 1
The metal mold comprises an upper mold 1 and a lower mold 2, wherein the upper mold 1 is used for forming a casting space of a small end of the main shaft, the lower mold 2 is used for forming a casting space of a large end of the main shaft, and the upper mold 1 and the lower mold 2 can be overlapped and assembled to form a complete casting space of the main shaft.
Flanges 3 are arranged at two ends of the upper and lower parting parts, and a plurality of bolt holes 4 are arranged on the flanges 3; at least two positioning holes 5 are respectively arranged on the two turnups 3 which are contacted with each other in the vertical parting manner, so that the vertical parting positioning and mounting can be realized by using pins; the inner edges of the two flanges 3 which are contacted with each other in a parting way are respectively provided with a parting groove and a parting bulge to form a step parting; the outer edges of the two turnups 3 which are contacted with each other in an up-and-down parting manner are also provided with sand supplementing grooves 6; the ladder type and the sand supplement groove 6 have a synergistic effect, so that the occurrence of shooting is avoided. Four hanging shafts 9 are fixed on the outer edge of at least the upper flanging 3 which is vertically divided. The parting groove is arranged on the lower parting 2. The outer wall of the metal mold is provided with reinforcing rib plates, and each reinforcing rib plate comprises a plurality of vertical rib plates 7 arranged along the axial direction and a plurality of transverse rib plates 8 arranged along the circumferential direction.
The metal mold has a uniform wall thickness, which is the average wall thickness of the main shaft.
Example 2
Different from embodiment 1, the metal-type outer wall of the present embodiment is not provided with the reinforcing ribs.
Example 3
Unlike example 2, the die wall thickness of this example is half the average wall thickness of the main shaft.
Example 4
In contrast to embodiment 2, the metal mold of the present embodiment has a conformal wall thickness, i.e., the ratio of the metal mold wall thickness at any height in the axial direction of the metal mold to the spindle wall thickness corresponding thereto is constant. The ratio is in the range of 0.5 to 1.5.
The shrinkage effect is compared:
the arrangement or non-arrangement of the reinforcing ribs on the outer wall of the metal mold basically has no influence on the shrinkage and loosening condition of the main shaft; when the uniform metal mold wall thickness is adopted, the improvement effect of the metal mold wall thickness change on the shrinkage porosity condition is not obvious; and the adoption of the conformal wall thickness obviously reduces the occurrence of shrinkage porosity.
Example 5
A Vestas MK3B main shaft casting system comprises the metal mold, a mud core 12 and a pouring system; the mud core 12 is positioned in the metal mold and coaxially arranged, and a casting cavity 10 is formed between the outer surface of the mud core 12 and the inner surface of the metal mold; a core bar (not shown in the figure) is arranged in the middle of the mud core 12; an air outlet rope (not shown) is wound on the core rod for exhausting air of the mud core 12; the gating system comprises a sprue 11, a socket 16, an ingate and a riser 13; the sprue 11 is arranged inside the core rod and axially extends through the mud core 12, the socket 16 is located at the bottom of the sprue 11 and is in fluid communication with the sprue 11, and the socket comprises a smaller-diameter primary buffer groove 18 located at the lower part and a larger-diameter secondary buffer groove 19 located at the upper part; the inner sprue is positioned at the bottom of the mud core 12 and communicated with the outer edge of the secondary buffer groove 19 and the casting cavity 10; the riser 13 is arranged at the top of the casting cavity 10. The inner gates are a plurality of circular tubes arranged around the periphery of the secondary buffer groove 19.
Example 6
In contrast to embodiment 5, as shown in fig. 6 to 7, the ingate is a slit 17, the slit 17 is a slit-shaped passage provided around the periphery of the secondary buffer groove 19, and the outlet end of the slit 17 is connected to the inside of the casting cavity 10.
Example 7
In contrast to embodiment 6, the outlet end of the batch gap 17 is connected to the outside of the casting cavity 10, and an external baffle is arranged outside the batch gap to buffer the molten metal again.
Slag inclusion effect comparison:
the batch gap channel can obviously reduce slag inclusion, the slag inclusion mainly appears in an R-angle area at the lower part of the main shaft, and the general designed machining allowance of the area is larger, so that the slag inclusion is easily removed by a mechanical machining means at the later stage.
Example 8
In distinction to examples 6 and 7, as shown in the drawing, the portion of the mud core 12 corresponding to the upper split 1 has a diameter smaller than the designed inner diameter of the main shaft, so that the main shaft obtains a wall thickness at that position which is increased from the designed amount. The increased wall thickness is gradually increased from bottom to top, and meanwhile, the wall thickness change of the main shaft at the upper and lower parting positions is continuous. In other words, at the connection of the upper and lower parting, the increased wall thickness is zero.
The shrinkage effect is compared:
comparison of the shrinkage porosity of the cast main shafts of examples 6 and 8. The shrinkage porosity problem is significantly improved after the increased wall thickness of the spindle is achieved.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.

Claims (8)

1. A wind power main shaft metal mold comprises an upper mold (1) and a lower mold (2), wherein flanges (3) are arranged at two ends of the upper mold and the lower mold, and a plurality of bolt holes (4) are formed in the flanges (3); be equipped with two at least locating hole (5), its characterized in that on two turn-ups (3) that the upper and lower parting contacted respectively: the inner edges of the two flanges (3) which are contacted with each other in a vertical parting manner are respectively provided with a parting groove and a parting bulge to form a step parting; the outer edges of the two turnups (3) which are in contact with each other in an up-and-down parting manner are also provided with sand supplementing grooves (6); the outer edge of at least the upper flanging (3) which is vertically divided is fixedly provided with a hanging shaft (9), the outer wall of the metal mold is provided with reinforcing rib plates, and each reinforcing rib plate comprises a plurality of vertical rib plates (7) which are arranged along the axial direction and a plurality of transverse rib plates (8) which are arranged along the circumferential direction.
2. The wind power main shaft metal mold according to claim 1, wherein: the metal mold has a conformal wall thickness, namely the ratio of the wall thickness of the metal mold at any height in the axial direction of the metal mold to the wall thickness of the main shaft corresponding to the height is constant.
3. The wind power main shaft metal mold according to claim 2, wherein: the ratio is in the range of 0.5 to 1.5.
4. The wind power main shaft metal mold according to claim 3, wherein: the ratio is 1.1.
5. The utility model provides a wind-powered electricity generation main shaft casting system, includes mud core (12), the gating system, its characterized in that: comprising a metal type according to any one of claims 1 to 4.
6. The wind power main shaft casting system of claim 5, wherein: the mud core (12) is positioned in the metal mold and coaxially arranged, and a casting cavity (10) is formed between the outer surface of the mud core (12) and the inner surface of the metal mold; a core bar is arranged in the middle of the mud core (12); the core rod is wound with an air outlet rope; the pouring system comprises a sprue (11), a socket (16), an inner pouring gate and a riser (13); the sprue (11) is arranged inside the core rod and axially extends through the mud core (12), the socket seat (16) is positioned at the bottom of the sprue (11) and is in fluid communication with the sprue (11), and the socket seat comprises a smaller-diameter primary buffer groove (18) positioned at the lower part and a larger-diameter secondary buffer groove (19) positioned at the upper part; the inner sprue is positioned at the bottom of the mud core (12) and communicated with the outer edge of the secondary buffer groove (19) and the casting cavity (10); and the riser (13) is arranged at the top of the casting cavity (10).
7. The wind power main shaft casting system of claim 6, wherein: the inner sprue is a batch gap (17).
8. The wind power main shaft casting system of claim 7, wherein: the part of the mud core (12) corresponding to the upper parting (1) is provided with a diameter smaller than the designed inner diameter of the main shaft, so that the main shaft obtains a wall thickness which is increased than the designed amount at the position, the increased wall thickness is gradually increased from bottom to top, and meanwhile, the wall thickness change of the main shaft at the upper and lower parting positions is continuous.
CN201920906522.6U 2019-06-17 2019-06-17 Wind-powered electricity generation main shaft metal mold and casting system Active CN210387460U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920906522.6U CN210387460U (en) 2019-06-17 2019-06-17 Wind-powered electricity generation main shaft metal mold and casting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920906522.6U CN210387460U (en) 2019-06-17 2019-06-17 Wind-powered electricity generation main shaft metal mold and casting system

Publications (1)

Publication Number Publication Date
CN210387460U true CN210387460U (en) 2020-04-24

Family

ID=70349420

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920906522.6U Active CN210387460U (en) 2019-06-17 2019-06-17 Wind-powered electricity generation main shaft metal mold and casting system

Country Status (1)

Country Link
CN (1) CN210387460U (en)

Similar Documents

Publication Publication Date Title
CN101486071B (en) Technique and equipment for pouring flanged fitting combination
CN110153371B (en) Casting method for preventing shrinkage porosity defect of ductile iron crankshaft
CN210387460U (en) Wind-powered electricity generation main shaft metal mold and casting system
CN103567390A (en) Method for designing process hole of sand core for aluminum alloy sleeper beam casting
CN203599478U (en) Sand core, metal die and metal casting equipment
CN206811093U (en) Coupler body casting mould and railway freight-car coupler mould
CN111360201B (en) Casting structure and casting method of internal gear box
CN110369678A (en) A kind of wind power principal axis metal mold and casting system
CN209349468U (en) A kind of more case sand core positioning tools
CN106890978A (en) The mould two pieces low pressure casting die of hybrid power engine cylinder cap one and its casting method
CN209935807U (en) Sand mold for casting engine cylinder block
CN107042287B (en) A kind of casting method of steam turbine high pressure main air valve casting
CN206425530U (en) One kind communication cavity mold
CN202667548U (en) Novel flange core box die
CN205437030U (en) Nodular cast iron box class foundry goods casting machine
CN100421835C (en) Method for founding pipes
CN200988088Y (en) Guided positioning type sand box
CN215657682U (en) Molding sand box of lower rocker arm
CN217192488U (en) Casting mould
CN209491308U (en) A kind of brake disc casting mould
CN213469534U (en) Die-casting die with exhaust block
CN112893776B (en) Low-allowance casting process for wind power casting
CN201493450U (en) Casting mould board
CN216540734U (en) Bottom pouring method casting stack sand mould
CN212682365U (en) Casting device of thermal power ductile iron low-pressure inner cylinder and pouring structure thereof

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant