CN2928320Y

CN2928320Y - High speed heavy load rotary center

Info

Publication number: CN2928320Y
Application number: CN 200620017091
Authority: CN
Inventors: 刘文职
Original assignee: SHENZHEN LEHUAHANG MOULD CO Ltd
Current assignee: SHENZHEN LEHUAHANG MOULD CO Ltd
Priority date: 2006-07-20
Filing date: 2006-07-20
Publication date: 2007-08-01
Anticipated expiration: 2016-07-20

Abstract

The utility model relates to a rotating center with high speed and heavy load, which comprises a liner, a spindle, and a main axle and a medium axle for locating the spindle in the liner, wherein, the inner end of the spindle stretches backwards to the inserting end of the liner, a tail axle is installed at the inner end of the spindle for matching with the inserting end of the liner, the spindle is fixed in the liner by the tail axle. In this way, the length of the whole spindle is prolonged much comparing with a cantilever beam formed by the outer end of the spindle stretches out of the liner. When processing big work-pieces or loading heavily, the utility model enables to guarantee the process precision as well as the spindle to endure heavier axial thrust by installing the medium axle as the thrust axle.

Description

High speed heavy load live centre

Technical field

The utility model relates to machine tool accessories, and more particularly, it is top to relate to a kind of high speed rotary that can bear big load.

Background technology

Live centre is widely used in various lathes, fast-developing especially now Digit Control Machine Tool.Existing Digit Control Machine Tool have rotating speed fast, bear the big characteristics of load, this has just proposed same requirement to the annex of this piece-holder of live centre.

For a long time, the live centre of most of lathes all is arranged on the tailstock tool, generally includes sleeve, mandrel, mandrel is positioned at base bearing and intermediate bearing in the sleeve.Wherein, described intermediate bearing is located by the step that is provided with on sleeve and the mandrel, and described base bearing is located at the end cap of sleeve ends by the step that is provided with on the mandrel with by thread seal, makes mandrel to rotate in sleeve thus, realizes revolution.Because the spacing between the two bearings is shorter, stretch out the top formation cantilever beam structures of sleeve part on the mandrel, at the machining large workpiece, when bearing bigger load, bigger axial force is very easy to this minor axis top partially, thereby the wearing and tearing of bearing have been quickened, make the radial run-out that top generation is bigger, reduced the machining accuracy of lathe.Make lathe certain restriction be arranged, thereby seriously restricted the development of high-speed numeric control lathe the workpiece of processing.

The utility model content

The technical problems to be solved in the utility model is, at the defective of live centre in the prior art, but provides the big workpiece of a kind of clamping, bear the high speed heavy load live centre of bigger load.

The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of

In high speed heavy load live centre described in the utility model,

Implement high speed heavy load live centre of the present utility model, has following beneficial effect: because mandrel is extended to the sleeve insertion end, and be fixed in the barrel bore by tail bearing, for the outside cantilever beam that forms of sleeve was stretched out in the mandrel outer end, the length of whole mandrel had increased than originally a lot.When machining large workpiece, load were big, the top place of mandrel made the circular runout at the top place of mandrel that causes because of axial thrust also reduce thereupon, thereby improved the lotus ability of holding of whole lathe, had guaranteed machining accuracy.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:

Fig. 1 is the overall structure schematic diagram of the utility model high speed heavy load live centre;

Fig. 2 is the I portion enlarged diagram of Fig. 1.

The specific embodiment

As shown in Figure 1, 2, in high speed heavy load live centre preferred embodiment of the present utility model, comprise sleeve 10 that the tailstock tool hole of appearance and standard is complementary, be set in the mandrel 20 in the barrel bore 11 and described mandrel 20 is positioned at base bearing 40, intermediate bearing 50 and tail bearing 70 on the barrel bore sidewall 12.The sleeve 10 of described live centre comprises the insertion end 13 in the described tailstock tool of insertion hole and the bare terminal end 14 of close workpiece.Described mandrel outer end 22 is stretched out in sleeve 10 outsides and is provided with the cone centre 23 of holding workpiece, and its inner 21 is inserted in the described barrel bore 11 and extands rearward to the sleeve afterbody.

Described tail bearing 70 is arranged on mandrel the inner.Described barrel bore 11 is provided with step 15 on the sidewall of insertion end 13, the end of described sleeve insertion end 13 is provided with jackscrew 16, described jackscrew 16 is fixed on step 15 places with described tail bearing 70, limits the axial displacement of tail bearing 70, thereby mandrel the inner is radially spacing in barrel bore.Described tail bearing 70 is preferably selected radial bearing for use.

Position near described sleeve bare terminal end 14 on the described mandrel is provided with step 121.The end of described sleeve bare terminal end 14 is provided with an end cap 60, and this end cap 60 matches by the intracavity sidewall of screw thread 61 with described sleeve bare terminal end 14, and the lumen openings of the whole bare terminal end 14 of cover sleeve.Described end cap 60 centers are provided with the centre bore 62 that passes for mandrel 20.Step 121 on this end cap 60 and the described mandrel is complementary, with the described base bearing 40 of common restriction moving axially along mandrel 20.Described base bearing 40 is the needle roller thrust bearing of line contact form preferably, to reach wear-resisting effect.

Like this, the radial displacement of described tail bearing 70 and base bearing 40 common restriction mandrels 20, for the sleeve 10 outside cantilever beams that form are stretched out in mandrel outer end 22, the length of whole mandrel 20 has increased than originally a lot, make the circular runout at top 23 places of mandrel that cause because of axial thrust also reduce thereupon, thereby improved whole machining accuracy.

In this preferred embodiment, described intermediate bearing 50 bears all axial thrusts that passed over by mandrel 20, and the equal bearing radial force of tail end bearing 70 and base bearing 40.The intermediate bearing place is set on described mandrel 20 and sleeve 10

step

24,17 is set respectively, be used for fixing described intermediate bearing 50.Described intermediate bearing 50 can be any bearing that can bear axial force, and described in the present embodiment intermediate bearing is preferably thrust bearing, and the thrust washer of its two end faces is two disks 71 that cooperate with

step

24,17 respectively.Like this, all axial thrusts that passed over by mandrel 20 all are passed on the sleeve 10 by intermediate bearing 70, and the distance between intermediate bearing 70 and the base bearing 40 is shorter, and mandrel 20 can oar deformation not take place because of bearing bigger axial force, and then strengthens top 23 radial run-out.Whole live centre can bear bigger axial force, bear bigger load, is fit to the various large-scale workpieces of fine finishining.Similar with described base bearing, described intermediate bearing is the needle roller thrust bearing of line contact form preferably, to reach wear-resisting effect.

In the above-described embodiments, described tail bearing 70 had better oiliness bearing, so just can take off the jackscrew 16 that sleeve insertion end 13 is provided with, just can be for these tail bearing 70 oilings, safeguard.

In the above-described embodiments, described sleeve lateral wall 12 has the oil filler point 18 of the described barrel bore 11 of a connection, and the oil sealing part 19 that seals this oil filler point 18; Described end cap 60 is provided with seal with described mandrel 20 junctions, and centre bore 62 places of described end cap 60 of while are provided with sealing ring 63 and felt collar 64 seals, and makes whole inner chamber form the cavity of a sealing.Only need add liquid lubricating oil from the bearing of oil filler point 18 in inner chamber, add solid-state lubricating oil and no longer need to open end cap, it is very convenient to operate, and does not also need to take apart end cap 70, has guaranteed the stability of machining accuracy; Can not cause the pollution of operating personnel or operation field because of taking end cap apart.Wherein, described oil sealing part 19 preferably is set to the oiling screw, and is very convenient quick during dismounting.

Claims

1, a kind of high speed heavy load live centre, comprise sleeve, mandrel and mandrel is positioned at base bearing and intermediate bearing in the inner chamber of sleeve, it is characterized in that, the inner of described mandrel extands rearward to the sleeve insertion end, and the inner of described mandrel also is provided with the tail bearing that matches with described sleeve insertion end.

According to the described high speed heavy load of claim 1 live centre, it is characterized in that 2, described tail bearing is a radial bearing.

According to the described high speed heavy load of claim 1 live centre, it is characterized in that 3, described tail bearing is an oiliness bearing, described sleeve tail end face is provided with the jackscrew of the described barrel bore of sealing.

According to the described high speed heavy load of claim 1 live centre, it is characterized in that 4, described intermediate bearing is a thrust bearing.

According to the described high speed heavy load of claim 4 live centre, it is characterized in that 5, described intermediate bearing is a needle thrust bearing.

According to each described high speed heavy load live centre among the claim 1-4, it is characterized in that 6, described sleeve lateral wall has the oil filler point that is communicated with described barrel bore, also be provided with the oil sealing part of this oil filler point of sealing; Described end cap and described mandrel junction are provided with seal.

7, according to each described high speed heavy load live centre among the claim 1-4, it is characterized in that described oil sealing is as the oiling screw.