CN2166900Y

CN2166900Y - Lathe centre adjustable for working external circular surface

Info

Publication number: CN2166900Y
Application number: CN 92228082
Authority: CN
Inventors: 徐敬千
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-07-22
Filing date: 1992-07-22
Publication date: 1994-06-01
Anticipated expiration: 2002-07-22

Abstract

The utility model relates to a lathe centre adjustable for working external circular surfaces, composed of a headstock driving plate centre and a tailstock revolving center, wherein, both the two centers have the assemblies of eccentric rotary plates and eccentric shaft cores; the rotary plates are tightly matched with the shaft cores and can rotate correspondingly from 0 DEG to 180 DEG; the centers are caused to have the function of centre adjustment, the revolution centers of workpieces can carry out eccentric adjustment with fixed quantity and in fixed direction, and the allowance is appropriately enlarged to obtain optimum surfacing effect at the defective positions on the surfaces of workpieces. The utility model is suitable for processing the external circular surfaces of the cylindric workpiece blanks and has good effects on processing workpiece blanks with irregularity, major diameters, nonmetallic material and large lot sizes.

Description

Lathe centre adjustable for working external circular surface

The utility model is that to be applied to the aligning of excircle of workpiece processing top,

When processing the blank excircle of workpiece of certain-length usually, generally all get centre bore earlier, make workpiece centering with the head of a bed is top with the tailstock live center, and dial the part of changing a job, reach the purpose of workpiece rotation processing with head of a bed dial at the workpiece two ends.Sometimes reasons such as workpiece blank shape irregularity and flexural deformation, the central hole location at workpiece two ends just is difficult to look for accurately, it is clean just to be prone to surface of the work one sidelight when cylindrical is processed, and a side is defectiveness still, causes waste product so that can't remove blemish in the excircle of workpiece size.General method of correcting is when finding excircle of workpiece generation deflection, unloads workpiece centering or press from both sides a pad in centre bore one side and rectify a deviation again according to live telecast, and these methods not only difficulty are bigger, and poor effect often.

The purpose of this utility model is: when workpiece during at processing excircles, train off or owing to workpiece blank itself has distortion and the crooked cylindrical allowance generation radial deflection that takes place as workpiece two ends centre bore, under the situation of a side allowance deficiency of cylindrical, needn't unload workpiece and readjust central hole location, and numerical value that can be on demand on lathe and direction are carried out displacement accurately to the pivot of workpiece, make a side of excircle of workpiece allowance deficiency increase allowance, one side of allowance surplus reduces allowance, make workpiece under the condition of identical allowance, obtain best Surface Machining effect.

The technical solution of the utility model is: the two eccentric principles in relative rotation of present technique utilization reach the function at adjustment center, and it is formed with the tailstock rolling center by head of a bed dial is top.

Below in conjunction with drawings and Examples, the utility model is described in further detail

Fig. 1 is top composition of the utility model two parts and scheme of installation.

Fig. 2 is the combination assumption diagram of top part.

Fig. 3 is that top center changes schematic diagram.

Among the figure 1, head of a bed chuck 2, the top body 3 of dial, dial support 4, eccentric rotating disk 5, dial orientation jackscrew 6, workpiece 7, lathe tool 8, tailstock orientation jackscrew 9, jackscrew supporting 10, tailstock rolling center body 11, eccentric rotating disk centre head 12, eccentric azimuth mark 13, rotating disk graduation mark 14, eccentric rotary case 15, hold-down screw 16, eccentric shaft core 17, central shaft

In Fig. 1,2,3,4,5 form the top part of head of a bed dials, and 4,8,9,10 form tailstock live center parts, workpiece two top between clamping and processing, on the head of a bed dial and the

jackscrew

5,8 in fixation workpiece orientation is installed on the afterbody live center.

In Fig. 2, the top combining structure of two parts is identical, (as shown in Figure 2).Top central shaft 17(is top body of dial and the top axon head part of tailstock just) the center and the pivot of lathe consistent, there is an eccentricity value E at the center of the eccentric shaft core 16 of central shaft end and the center of central shaft.Eccentric shaft core 16 and eccentric rotary case 14 closely cooperate.Both eccentricity values are identical, and the center overlaps.And can do relatively rotating of 0-180 degree mutually.There is an eccentricity value E at the center of the centre head 11 of eccentric rotary case end and the center of eccentric rotary case.Under normal circumstances, the center of the center of centre head and central shaft consistent (as shown in Figure 2) this moment, top eccentricity value was 0.In 180 angular ranges of eccentric rotary case circumference, be carved with the graduation mark 13 of the different eccentricity values of some expressions, eccentric rotary case turns to each graduation mark on the eccentric shaft core, all available hold-down screw 15 is located, and is carved with the index aperture 12 of eccentric direction on the corresponding position of each graduation mark.

In Fig. 3, represent top variable condition when adjusting at the center.The center of central shaft is at the A point.The eccentric shaft core of central shaft end and the center of eccentric rotary case are at the B point, the centre head center of eccentric rotating disk end is at the A point, when eccentric rotating disk is that the center of circle rotates 180 when spending with the B point on the axle core, the C point is then transferred to by the A point in the centre head center of eccentric rotating disk end, at this moment centre head center and 2E value of central shaft centre deviation.Also with the eccentric 2E value in sum central shaft center (lathe pivot just), so a side allowance of excircle of workpiece increases 2E by the workpiece centre of top centering.Opposite side reduces 2E on the contrary.This moment, top offset reached maximum.If (top maximum eccentricity amount is set at 10 millimeters.5 graduation marks are arranged, and then eccentric rotating disk revolution moves a groove, and excircle of workpiece allowance can be offset 2 millimeters).When workpiece was selected different tuningout values, top eccentric direction was also different, after can agreeing by 12 target directions of the azimuth mark on the eccentric rotating disk and workpiece, with

orientation jackscrew

5,8 top tight workpieces, carried out cylindrical processing then.

The advantage of present technique is: the aligning top tip structure is simple, manufacturing expense is low, using method is grasped easily, general workman just can carry out aligning to the cylindrical machining blanks than complex appearance and handle, make the serious and little workpiece of allowance of a collection of bending also can obtain Surface Machining effect preferably, and the workpiece that makes some just can't eliminate blemish without accurate aligning is remedied.Use present technique not only can improve the yield rate and the working (machining) efficiency of workpiece, and the surface of the work crudy is improved.For cylindrical workpiece in enormous quantities, the cylindrical processing effect of nonmetal, big specification and irregular blank is better.

In order to further specify structure of the present invention and using method, it is as follows now to give an actual example: one of practical best occasion of present technique is the cylindrical processing that is used for the graphite electrode blank, the graphite electrode blank is that the product of baking, bending phenomenon are more, and it is big to find the center difficulty accurately, and is to produce in enormous quantities.For example process the graphite electrode of diameter 300MM, cylindrical allowance 6MM, blank diameter 312MM, selecting maximum offset is 10MM, ten of eccentric rotating disk graduation marks, each scale offset is 1MM.The depth of cut of cylindrical processing for the first time is 3MM, outside diameter after the processing is 306MM, at this moment find that there is the dark pit of 4.5MM at cylindrical one place, if the cylindrical processing capacity is still with the penetration of a cutting tool of the 3MM degree of depth for the second time, when outside diameter reaches standard size 300MM, and the pit degree of depth still has 1.5MM not remove, and this product will not be inconsistent requirement.At this moment utilize the top function of this aligning, the orientation jackscrew of hold-down screw on the eccentric rotating disk and two on top unclamped, graduation mark on the eccentric rotating disk after being transferred to 4, null value is held out against the location, again with graduation mark 4 corresponding eccentric direction index aperture, the midline of alignment pieces surface crater is then by two end faces of the tight electrode of orientation jackscrew.Behind the adjustment center, workpiece has a side allowance of pit to be increased to 5MM by 3MM.Opposite side Surface Machining surplus then drops to 1MM by 3MM, and offset is 4MM.During the penetration of a cutting tool for the second time of the electrode blank behind the tuningout, just can remove the pit that the degree of depth is 4.5MM, diameter reaches requirement size 300MM, and surface quality reaches requirement.

Claims

1, the aligning used of a kind of processing excircles is top, and it is to utilize two eccentric principles in relative rotation to reach the function at adjustment center.It is formed with the tailstock live center by head of a bed dial is top.It is characterized in that: top position is by making up with top eccentric rotating disk and eccentric shaft core, and both eccentricity values are identical, and can do relatively rotating of 0-180 degree mutually.

2, top by the described aligning of claim 1, it is characterized in that: in 180 angular ranges of eccentric rotating disk circumference, be carved with the graduation mark of the different eccentricity values of some expressions, be carved with the index aperture of eccentric direction on the corresponding position of each graduation mark.

3, top by the described aligning of claim 1, it is characterized in that: the jackscrew in fixation workpiece orientation is being installed on the head of a bed dial and on the afterbody live center.