CN2101537U - Precise wind power static pressure high-speed table drill for bearing - Google Patents

Abstract

The utility model relates to a precise wind power static pressure high-speed table drill for a bearing. The utility model applies the principle of the air injection of a turbine and uses the purified compressed air as the power. The upper part, the middle part and the lower part of a power head and a plane bearing adopt wind film static pressure bearings. The utility model has the advantages of high rotation speed, no shock, low noise, stepless speed change, etc. The precise wind power static pressure high-speed table drill for the bearing is suitable for microbore machining of fields of the spaceflight, the aviation, electronic instruments, nozzles of diesel engines, etc.

Description

Precise wind power static pressure high-speed table drill for bearing

The utility model is that accurate pneumatic hydrostatic bearing high-speed bench drilling machine belongs to metal machining tool class.

Along with science and technology to high-grade, precision and advanced, the microminiature development, in space flight, aviation, communications and transportation, electronic instrument, the chemical fibre spinning head, in the fields such as diesel engine nozzle, there is the higher micropore of big accuracy of measurement to need processing and manufacturing, and present homemade Z40068 high-speed bench drilling machine, maximum speed is that 1600r/mih and its rotating speed of daily output high-speed bench drilling machine are 20000r/mih, actual operation instruction does not reach, can't process the following micropore of φ 1.2mm, owing to have inadequate natural endowment in its design of motor high-speed bench drilling machine, can't solve following technical barrier: first, motor high-speed bench drilling machine main shaft diameter depends on the higher high-speed ball bearing of precision to axially mounting, but it is subjected to the restriction of high speed rotational line speed, and continuous operation for a long time, therefore rotating speed can't improve, the second electric high-speed bench drill is according to the traditional design scheme, the pagoda belt pulley that connects motor and unit head with V belt, motor main shaft itself is because dynamic balancing is poor, produce vibration, pagoda belt pulley inside and outside garden concentricity and main shaft mismatch error in machining also produce vibration, bearing of motor and unit head bearing itself is gapped, above binomial factor, traction mutually in unit head rotates at a high speed, produce resonance, cause chatter big, low precision.Three-motor itself has noise in operation process, lower ball bearing on the unit head, plane bearing footpath V belt drags pagoda belt pulley single load bearing, pellet shot from a slingshot produces mechanical friction and brings noise, rotating speed is fast more, noise is big more, the 4th operating mechanism feel poor sensitivity, electric high-speed bench drill delivering gear adopts incense coil spring control unit head lift work, the incense coil spring has bounce, offseted the hand lever propelling, the susceptibility that drill bit contacts with work post causes the non-operation little drill bit that fractures, the 5th, the electric high-speed bench drill is to use " O " shape or V belt to connect by different level with the pagoda belt pulley to drag, each class rotating speed is fixed, the speed change inconvenience, and be subjected to limitation again.

The purpose of this utility model, the conventional electric high-speed bench drilling machine is updated, satisfy and finish on high-speed bench drilling machine that must to break away from traditional be that power and high speed shaft are made supporting with the motor, the most desirablely be converted into pressure-air, not only be used as power but also, main shaft air pressure is drawn become a common practice under the state that film suspends as the air bearing of dynamic head main spindle supporting with electric energy, the viscous force of mechanical friction and grease does not take place, brought into play the function of rotation at a high speed, for this reason, design wind film hydrostatic bearing unit head.

The design is a power with pure compressed air, when 0.5～0.6MPa compressed air enters source of the gas distribution plate 19 by air gas cleaner 14, one road source of the gas directly enters wind film hydrostatic bearing, make the main shaft floating, another road source of the gas is through its changing speed and regulating pressure valve 13, enter main axis rotation switch 5 when pressure regulator valve transfers to required rotary speed working pressure gas source, source of the gas enters turbine 14 injections through the main shaft mesopore during start, promotes main axis rotation, the design's Pressure gauge has two, one is total bleed pressure table 12, and another is a speed governing Pressure gauge 8, and the speed governing Pressure gauge can show the main axis rotation speed, when pressure transfers to 0.15MPa, the speed of mainshaft should be 15000r/mih mutually, and when pressure was 0.25MPa, the speed of mainshaft should be 25000r/mih mutually, improve rotating speed if desired, must pull down blast pipe 18, when pressure was 0.3MPa, the speed of mainshaft was 30000r/mih.

Below in conjunction with accompanying drawing the utility model is described in further detail:

Fig. 1 is the design's complete machine left side TV structure schematic diagram;

Fig. 2 looks the part section structural representation for the design's complete machine right side;

Fig. 3 is the unit head schematic diagram;

Fig. 4 adorns figure again for the upper, middle and lower bearing.

With reference to Fig. 1～4, the accurate pneumatic hydrostatic bearing high-speed bench drilling machine of the design is by inlet suction port, air filtration Device 14, source of the gas distribution plate 19, wind film air inlet pipe 11, gas inlet casing 1, rotating speed pressure regulator valve 13, main shaft rotary switch 5, screw mandrel 6, total bleed pressure table 12, speed governing Pressure gauge 8, counterweigh axle 10, forced filling oil cup 9, unit head 3, crane 4, set lever 7, control crank 16, blast pipe 18, base 20 compositions such as grade, the compressed air that attracts from compressed air line, be connected on by rubber tube on the inlet suction port 15 of this machine air cleaner 14, in order to make compressed air purifying, before this machine of connecting, need the water in the pipeline and oil are put only, when passing through air filter 14 with 0.5～0.6MPa compressed air, enter source of the gas distribution plate 19, be divided into two the tunnel, one road gas is by wind film air inlet pipe 11, directly enter wind film hydrostatic bearing and make main shaft 25 floatings, another road is by gas inlet casing 1, through source of the gas rotating speed pressure regulator valve 13, transfer to required rotary speed working air pressure and enter the main shaft rotary switch. During start, source of the gas enters turbine through main shaft 25 mesopores and sprays, promote main shaft 25 rotations, but must note, when opening the main shaft rotary switch, should progressively amplify air-flow, before closing total source of the gas, must treat the main shaft stall, must guard against and close total source of the gas when main shaft not yet stops the rotation, counterweigh axle 10 is to overcome owing to cause the form and position tolerance deviation will bring main shaft to be assembled in material structure density and the machining to produce centrifugal force in the rear High Rotation Speed inhomogeneous among Fig. 2, main shaft and steel bearing are stung very, this machine critical piece unit head 3 principles are as shown in Figure 3: it has worm gear 21, plane bearing 22, middle interval volume 23, upper bearing (metal) 24, main shaft 25, middle (center) bearing 26, lower bearing 27, power cover 28, return-air nut 29 compositions such as grade, unit head all adopts wind film hydrostatic bearing, cleans up earlier lower bearing external diameter 1:3000 taper direction in the ， And measurement before installation. Lower bearing is depressed into that power external threading omoplate is flat, middle (center) bearing kidney slot centrally aligned power cover turbine air inlet, be depressed into apart from power and overlap 93mm place, big plane. The big plane of upper bearing (metal) windward film connecting hole will be aimed at power cover wind film link slot, presses To flat with power cover large end face, main shaft is put into bearing, install plane bearing after, available hand test main shaft axially has certain feel vibration gap, loads onto then worm gear 21 and worm gear block.

The utility model embodiment is shown in Fig. 1-4, the power cover is a garden tube that has the mesopore of big planar ends flange, mesopore garden tapering is 1:3000, on big planar ends flange, be split into four equally distributed installing holes, with wind symphysis access slot 31, flute length equals power cover length, the flange side is split into wind film air inlet and turbine air-intake 30, turbine air admission hole one is through to pressing dress middle (center) bearing position, it is linked to each other with kidney slot on the mesopore axle, upper bearing (metal) also is a mesopore garden tube that has big face-flange, be split into several rectangular channels on the tube of garden, its outside dimension is slightly less than the external diameter of power cover, taper ratio is that 1:3000 equals power cover flange face size in big face-flange face size, be split into 4 installing hole wind film connecting holes and 6 diameters spilehole between 0.2～0.6mm above, optimum diameter is 0.5mm, have 12 pores on the bearing, its diameter is between 0.2～0.5, with φ 0.35mm is the best, middle (center) bearing has a kidney slot 32 in the middle of bearing, during assembling, kidney slot centrally aligned power cover turbine air-intake, be uniform-distribution with 6 diameters spilehole between 0.2～0.5mm on the end face, the outer garden taper ratio 1:3000 of middle (center) bearing, have a plurality of rectangular channels on the lower bearing, it is that 0.2～0.5mm spilehole And is the best with φ 0.35mm that 12 diameters are arranged between rectangular channel and bearing mesopore.

The utility model maximum speed can reach 30000r/mih, no chatter, noise hangs down only micro-exhaust sound, the drilling pore diameter range is 0.1～1mm, radial and axial beating≤0.002mm after dynamic head main spindle suspends, unit head impulse stroke 48mm, operating air pressure 0.5～0.6mp, this machine is adjusted, and operation and maintenance is more convenient, can finish the high micropore of precision in the various metal material machinings.

Claims (8)

1, a kind of by crane 4, set lever 7, unit head 3, base 20 etc. form high-speed bench drilling machine, it is characterized in that:

1. unit head upper bearing (metal) 24, middle (center) bearing 26, lower bearing 27 and plane bearing 22 all adopt wind film hydrostatic bearing.

2. the power of unit head adopts the compressed gas that purifies, and source of the gas footpath main shaft 25 mesopores enter turbine 21 and spray, and promote main axis rotation.

3. a counterweigh axle 10 is arranged, overcome machining deviation and cause that main shaft 25 produces the centrifugal force inhomogeneities in the rotation at a high speed.

2, a kind of by the described high-speed bench drilling machine of claim 1, it is characterized in that having on the big plane of upper bearing (metal) the spilehole of wind film connecting hole and 6 even five equilibriums, be split into rectangular channel on the bearing, the external diameter tapering 1:3000 of rectangular channel, rectangular channel and bearing mesopore have 12 spileholes.

3, a kind of by claim 1 and 2 described high-speed bench drilling machines, the diameter that it is characterized in that 6 spileholes on the big plane of upper bearing (metal) is chosen between 0.2～0.6mm, and the best is 0.5mm, and 12 hole diameters are chosen in that ， And is the best with φ 0.35mm between 0.2mm～0.5mm on the bearing.

4, a kind of by the described high-speed bench drilling machine of claim 1, it is characterized in that the centre is split into a kidney slot on the middle (center) bearing, during assembling, kidney slot centrally aligned power cover turbine air-intake.

5, a kind of by the described high-speed bench drilling machine of claim 1, it is characterized in that having on the lower bearing a plurality of rectangular channels, it is that 0.2～0.5mm spilehole ， And is the best with φ 0.35 that 12 diameters are arranged between rectangular channel and lower shaft mesopore, rectangular channel external diameter tapering is 1:3000.

6, a kind of by claim 1 and 4 described high-speed bench drilling machines, it is characterized in that being contained in power cover Nei ， And by lower bearing, to be depressed into power external threading omoplate flat.

7, a kind of by claim 1 and 2 described high-speed bench drilling machines, it is characterized in that the big plane of upper bearing (metal) windward film connecting hole will aim at power cover wind symphysis access slot.

8, a kind of by the described high-speed bench drilling machine of claim 1, it is characterized in that purification of compressed air process air cleaner 14 filtration, purifications before entering unit head.

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