CN105689676A

CN105689676A - Special centrifugal casting machine for large-scale bearing bush babbitting

Info

Publication number: CN105689676A
Application number: CN201610121985.2A
Authority: CN
Inventors: 丁继明; 李德平; 张强
Original assignee: DEC Dongfang Turbine Co Ltd
Current assignee: DEC Dongfang Turbine Co Ltd
Priority date: 2016-03-04
Filing date: 2016-03-04
Publication date: 2016-06-22
Anticipated expiration: 2036-03-04
Also published as: CN105689676B

Abstract

The invention discloses a special centrifugal casting machine for large-scale bearing bush babbitting. The special centrifugal casting machine comprises a speed reducer, a main shaft, a box body, a clamping disc and a casting system, wherein the speed reducer is connected with the main shaft through a belt pulley; the main shaft is mounted in the box body through a bearing, penetrates through the box body, and is connected with the clamping disc; a clamping claw assembly is arranged on the clamping disc and used for clamping a workpiece; a casting groove in the casting system extends into the inner cavity of the workpiece. The special centrifugal casting machine has the positive effects that the temperature rise in a moving part is greatly reduced, and thus the bearing is not easy to damage; in high-temperature workpiece babbitting process, a floating clamping claw mechanism is kept being in the clamping state, so as to avoid a heat expansion/cold contraction impact on the workpiece; through equidistant key grooves in a clamping claw seat, the equipment bearing capability is improved; a steel ruler is arranged on the obverse of the clamping claw seat for reference, so that the high-temperature workpiece can be quickly clamped and correctly positioned; and hydraulic thrust clamping is replaced by mechanical claw clamping, so as to increase the workpiece fixing reliability, reduce the maintenance frequency of a hydraulic system, and improve the product quality and the production efficiency.

Description

Large axle bush waters the special centrifugal casting machine of bar

Technical field

The present invention relates to a kind of large axle bush and water the special centrifugal casting machine of bar, for the babbit liquid of fusing is uniformly cast to round piece inwall by centrifugal action。Centrifugal casting machine drives large-scale workpiece high speed rotating, and babbit liquid injects workpiece lumen, and under centrifugal action, aluminium alloy uniform application is in workpiece inner wall。

Background technology

Centrifugal casting machine is widely used on market, there is vertical, horizontal centrifugal casting machine, aluminium alloy could be covered with workpiece lumen and alloy uneven thickness (lower thickness is upper thin) as adopted vertical centrifugal-casting machine to need very big linear velocity to produce centrifugal force by large axle bush casting；Horizontal based on roller supporting form, be suitable for large-scale long shaft class workpiece, and bearing shell is large-scale short shaft-like work (diameter is more than length), high speed rotating safety it cannot be guaranteed that。

Existing small-sized bearing shell centrifugal casting machine adopts the fixing workpiece of left and right wheel disc method of clamping, and wherein a wheel disc is fixed, and another wheel disc of Hydraulic Cylinder moves axially, frictionally clamping workpiece, and workpiece is manually rule location。Existing problems: 1. frictional force drives workpiece and fixing wheel disc axle rotate, bearing capacity is low, and easily produce skidding, impact casting quality 2. rotating shaft directly contacts with high temperature workpiece, main shaft temperature rise is fast, temperature is high, the easy locking of bearing damages, reduce equipment amplitude when 3. production efficiency cast big, hydraulic clamping system operating pressure is big, poor stability causes that oil temperature raises, hot environment Hydraulic Elements rapid wear 4. workpiece is manually rule location, ability of feeling relieved, and offset is big, high speed rotating produces powerful centrifugal force and easily makes workpiece radial slippage, causes security incident。

Along with turbine LP rotors power increase, particularly nuclear power technology development, bearing shell specification is also gradually increased, and existing bearing shell centrifugal casting machine can not meet large axle bush casting requirement, and existing casting machine exists the problems referred to above, often needs maintenance。

Summary of the invention

In order to overcome the shortcoming of prior art, the invention provides a kind of large axle bush and water the special centrifugal casting machine of bar。

The technical solution adopted in the present invention is: a kind of large axle bush waters the special centrifugal casting machine of bar, including decelerator, main shaft, casing, chuck and casting system, wherein: decelerator is connected with main shaft by belt pulley, and main shaft is arranged in casing by bearing；Described main shaft passes casing and is connected with chuck, is provided with jaw components on chuck；The casting groove of described casting system stretches into workpiece lumen。

Further, front end bearing assembling place at described casing is provided with coolant jacket, has helicla flute at coolant jacket Excircle machining, is provided with fuel feed hole and spill port on coolant jacket。

Further, described casing is additionally provided with bearing lubrication fuel feed hole。

Further, described jaw components includes master jaw and the leading screw being arranged on master jaw and claw, is provided with the equidistant key coordinated with the equidistant keyway on chuck bottom master jaw。

Further, the retaining part of claw is provided with sliding axle, disc spring group and locking nut。

Further, the pressing plate coordinated with excircle of workpiece cannelure it is provided with at claw top。

Further, master jaw is provided with Steel Ruler。

Compared with prior art, the method have the advantages that

(1) main shaft and bearing are equipped with cooling body, add that high temperature workpiece directs heat transfer and become radiant heat transfer heat, and making moving component temperature rise be substantially reduced, bearing is hardly damaged, and improves production efficiency。

(2) floating clamping mechanism click-on mechanism guarantees that high temperature workpiece waters and is in clamped condition in bar process all the time, it is to avoid workpiece expands with heat and contract with cold impact；

(3) the equidistant keyway of master jaw adds device load-bearing capability, and front is provided with Steel Ruler comparison, it is ensured that high temperature workpiece is installed soon, positions standard。Workpiece is installed precision height, produces centrifugal force and reduces, and vibration equipment is little, failure rate is low。

(4) hydraulic thrust clamping changes the clamping of claw mechanical type into, increases the fixing reliability of workpiece, reduces hydraulic system frequency of maintenance, improve product quality and production efficiency。

Accompanying drawing explanation

Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:

Fig. 1 is the population structure schematic diagram of the present invention；

Fig. 2 is body structure schematic diagram；

Fig. 3 is jaw components mounting structure schematic diagram；

Fig. 4 is the profile of jaw components。

Detailed description of the invention

A kind of large axle bush waters the special centrifugal casting machine of bar, as it is shown in figure 1, include: main shaft 1, casing 2, chuck 3, jaw components 4, workpiece 5, casting system 6 etc., wherein:

Decelerator is connected with main shaft 1 by belt pulley, and main shaft 1 is arranged in casing 2 by bearing, and main shaft 1 passes casing 2 and is connected with chuck 3, and chuck 3 is provided with jaw components 4, is used for clamping workpiece 5；The casting groove of casting system 6 stretches into workpiece 5 inner chamber。Main shaft 1 is provided with cool cycles oilhole, adds the circulation cooling oil on main shaft surface, makes main shaft inside and outside cooling simultaneously, reaches main shaft cooling purpose。

Workpiece 5 has certain distance (205mm) after installing with chuck 3, and temperature is by radiant heat transfer to main shaft 1 and chuck 3, and thermaltransmission mode is become radiant heat transfer from the transmission of original direct contact heat, reduces heat transference efficiency, makes main shaft temperature rise diminish。

The shape of described casing 2 and structure are as shown in Figure 2, including: assembling place of front end bearing is provided with coolant jacket 9, helicla flute 10 is had at coolant jacket 9 Excircle machining, the cooling oil of Cool oil machine injects coolant jacket fuel feed hole 8, after circling round along helicla flute 10, flowing out from spill port 11, the cooling oil of circulation reaches cooling bearing outer ring purpose；The cooling oil injection bearing lubrication fuel feed hole 7 of Cool oil machine, end bearing before entering, plays lubrication and cooling bearing purpose。

Described jaw components 4 positions with chuck 3 as it is shown on figure 3, include adjusting screw 12, nut 13, tommyhead bolt 14, Steel Ruler 15, feather key 16, master jaw 17, leading screw 20, claw 21。Wherein:

Bottom master jaw 17, processing has 3 equidistant keys 19, corresponding with the equidistant keyway 18 of chuck 3, when after jaw components 4 with chuck 3 assembling, during clamping workpiece, and not only tommyhead bolt 14 stress, 3 keys 19 also stress simultaneously, considerably increase the bearing capacity of jaw components 4。

4 points of coarse adjustment of jaw components and accurate adjustment, coarse adjustment is for move along chuck 3 overall radial, and accurate adjustment is rotating threaded shaft 20, makes claw 21 move radially。During coarse adjustment, jaw components 4 is in level, unclamp nut 13, jack-up adjusts screw 12, making the keyway bottom surface of master jaw 17 slightly above chuck 3 end face, now, feather key 16 and tommyhead bolt 14 are still in T-slot, promote master jaw 17 to the keyway position needing location, then exit adjustment screw 12 and fastening nut 13。During accurate adjustment, rotating threaded shaft 20, according to adjustment amount, comparison Steel Ruler 15 scale carries out accurate adjustment。

During card engaging workpiece 5, two claws 21 of obliquely downward are adjusted in place (measuring workpiece external diameter to calculate), oblique upper two claw 21 steps back certain distance, put into after claw 21 until high temperature workpiece, tighten oblique upper two leading screw 20 immediately, it is ensured that workpiece rapid-mounted and offset are little。

As shown in Figure 4, leading screw 20 and claw 21 are arranged in master jaw 17 described jaw components 4 internal structure, and sliding axle 23, disc spring group 24 and locking nut 22 are arranged on claw 21 retaining part。When leading screw 20 drives claw 21 to clamp workpiece 5, sliding axle 23 compresses disc spring group 24, when workpiece cooling meat occurs in casting cycle, under disc spring group effect, promotes sliding axle 23 to clamp workpiece 5 all the time, it is achieved online clamping function。The pressing plate 25 at claw 21 top coordinates with the cannelure of workpiece 5 cylindrical, it is prevented that workpiece 5 slides axially, and plays safety protection function。

The operation principle of the present invention is as follows: 1. on the heated parts 5 of about 250 DEG C chuck for installing 3 quick, accurate。Speed is fast, in order to avoid temperature drop is excessive, Ba Zhiliang is watered in impact；Offset is little, in order to avoid producing excessive centrifugal force to cause vibration equipment。2. driven main shaft 1 high speed rotating by decelerator by belt transmission, and then drive workpiece 5 high-speed rotation。3. in the casting groove of casting system 6, babbit liquid is injected so that it is flow into workpiece 5 inner chamber。4. workpiece at the uniform velocity rotates, and under centrifugal action, aluminium alloy uniform application is in workpiece inner wall。

Claims

1. a large axle bush waters the special centrifugal casting machine of bar, it is characterised in that: include decelerator, main shaft, casing, chuck and casting system, wherein: decelerator is connected with main shaft by belt pulley, and main shaft is arranged in casing by bearing；Described main shaft passes casing and is connected with chuck, is provided with jaw components on chuck；The casting groove of described casting system stretches into workpiece lumen。

2. large axle bush according to claim 1 waters the special centrifugal casting machine of bar, it is characterised in that: front end bearing assembling place at described casing is provided with coolant jacket, has helicla flute at coolant jacket Excircle machining, is provided with fuel feed hole and spill port on coolant jacket。

3. large axle bush according to claim 1 waters the special centrifugal casting machine of bar, it is characterised in that: on described casing, it is additionally provided with bearing lubrication fuel feed hole。

4. large axle bush according to claim 1 waters the special centrifugal casting machine of bar, it is characterised in that: described jaw components includes master jaw and the leading screw being arranged on master jaw and claw, is provided with the equidistant key coordinated with the equidistant keyway on chuck bottom master jaw。

5. large axle bush according to claim 4 waters the special centrifugal casting machine of bar, it is characterised in that: the retaining part at claw is provided with sliding axle, disc spring group and locking nut。

6. large axle bush according to claim 4 waters the special centrifugal casting machine of bar, it is characterised in that: the pressing plate coordinated with excircle of workpiece cannelure it is provided with at claw top。

7. large axle bush according to claim 4 waters the special centrifugal casting machine of bar, it is characterised in that: on master jaw, it is provided with Steel Ruler。