CN200988151Y - Cylindrical grinding machine - Google Patents

Abstract

The utility model discloses an internal grinder, the typical application situation of which is used for processing a high precision sleeve type spindle unit. By the structure that both ends of a head frame spindle unit used to hold a work-piece are respectively provided with a grinding head spindle unit, thus the work-piece can be processed at both ends under the condition of once clamping so that the high coaxiality demand inner holes at two ends of the sleeve is improved.

Description

A kind of internal grinder

Technical field:

The utility model relates to a kind of internal grinder, and its typical applications is the sleeve that is used for the telescopic main axle unit of machining high-precision.

Background technology:

The modular design of telescopic main axle unit as shown in Figure 1, respectively there is a high precision inner-pore at the sleeve two ends of the telescopic main axle unit of high accuracy, be to guarantee the reliability of transmission, the axiality of two endoporus requires very high, usually below 0.01mm.Grinding is a kind of important processing method of high accuracy rack sleeve.As shown in Figure 2, because traditional grinding machine has only a bistrique, must be on the headstock with the main axle unit clamping, the main axle unit rotation, bistrique feed, processing one end endoporus earlier, after cutting finishes, the bistrique withdrawing, main axle unit stops the rotation, and then main axle unit is transferred turnback to repeat the endoporus that aforesaid operations is processed the other end again behind the clamping again.Because the central shaft of the main axle unit during twice clamping must have certain angular error, thereby the endoporus at two ends certainly exists coaxiality error, the factor that influences this angular error is numerous, random deviation that produces in the two ends cylindrical cylindricity of main axle unit, the clamping process etc. for example, this clamping technology is difficult to guarantee the axiality of sleeve two ends endoporus.

In order to address the above problem, the someone has adopted high precision turntable (or numerical control rotating platform) to come clamping sleeve formula main axle unit.After processing an end endoporus,, make other end endoporus come the bistrique part, the endoporus of the reprocessing other end with turntable Rotate 180 degree.Itself there is angular errors in high precision turntable (or numerical control rotating platform), necessarily there is coaxiality error in the two ends endoporus in theory, coaxiality error depends on the accuracy of manufacture of high precision turntable (or numerical control rotating platform), although the high accuracy of manufacture of high precision turntable (or numerical control rotating platform) makes its angular errors can reach below 15 seconds at present, if but length sleeve is 350mm, the coaxiality error Δ x of sleeve two ends endoporus is calculated as follows:

$\mathrm{\Δx}=\frac{15\×\mathrm{\π}}{60\×60\×180}\×175$

$=0.012\mathrm{mm}$

This error amount has surpassed common designing requirement.Reach common designing requirement, the accuracy of manufacture of high precision turntable (or numerical control rotating platform) should reach below 7.5 seconds in theory.Such standard one realizes difficulty, and two promptly allow to realize that its cost is also very high.The internal grinder of the telescopic main axle unit of existing processing is difficult to satisfy the accuracy of manufacture requirement of telescopic main axle unit.

The utility model content:

The purpose of this utility model provides a kind of internal grinder, can eliminate the coaxiality error of telescopic main axle unit two ends endoporus, and energy simplified processing process flow process, improves working (machining) efficiency.

Internal grinder of the present utility model is equipped with two bistriques that are provided with in opposite directions on the main guide rail of lathe bed, but the headstock hollow main shaft of clamping workpiece is housed between two bistriques.

Because the utility model has two bistriques that are provided with in opposite directions, but the headstock hollow main shaft of clamping workpiece is arranged between two bistriques.When using internal grinder of the present utility model to process the two ends endoporus of telescopic workpiece, it is operating as: on headstock hollow main shaft, headstock hollow main shaft begins rotation with clamping workpiece, an at first feed of bistrique, the endoporus of processing one end, after the completion of processing, this bistrique withdrawing; Another bistrique feed, the endoporus of the processing other end, this endoporus completion of processing, headstock hollow main shaft stops the rotation, and takes off workpiece, end of operation.Using the utility model to process telescopic workpiece only needs a clamping just can process two endoporus, does not need 180 degree to turn workpiece, and when making processing two endoporus, workpiece rotates around same axis of rotation, does not produce the possibility of coaxiality error.Even during clamping workpiece, the central axis of axis of rotation and workpiece is inconsistent, and its two ends endoporus is also strict to be its common center axis with axis of rotation, can not produce coaxiality error between two endoporus.

Using the utility model to process telescopic workpiece two ends endoporus can't cause other requirement on machining accuracy not satisfy.The turn error of bistrique can cause the endoporus ovalize; Back and forth the straightness error of feed can cause endoporus tapered; This of feed motion counted the scale error that precision can cause endoporus.Headstock hollow main shaft can adopt existing high rotating accuracy hydrostatic spindle, and its rotating accuracy can reach below the 0.003mm; The linearity of the reciprocal feed just linearity of guide rail has reached below the 0.005mm/1000mm; The accuracy of reading of feed motion has reached 0.001mm.The utility model can be united use with above-mentioned advanced technology, guarantees that other requirement on machining accuracy are met.

Need not turn workpiece when using the utility model to process telescopic workpiece two ends endoporus, thereby save the operation sequence that workpiece dismounting, clamping and axiality are adjusted, make simplified control, operating efficiency can significantly improve.The utility model also can be used to process other workpiece that comprises the interior circle that axiality has relatively high expectations.

Description of drawings:

Fig. 1 is the schematic diagram of telescopic main axle unit;

Fig. 2 is existing telescopic main axle unit processing mode schematic diagram;

Fig. 3 is to use telescopic main axle unit processing mode schematic diagram of the present utility model;

Fig. 4 comprises horizontal internal grinder of the present utility model;

Fig. 5 comprises internal cylindrical grinding machines with vertical spindle of the present utility model;

Fig. 6 is the grinding machine that utilization the utility model is reequiped on existing grinding machine.

The specific embodiment:

As shown in Figure 3, the utility model comprises two bistriques 1 that are provided with in opposite directions, but the headstock hollow main shaft 2 of clamping workpiece is arranged between two bistriques.

The high rotating accuracy hydrostatic spindle of headstock hollow main shaft 2 preferential selections.High rotating accuracy hydrostatic spindle is a prior art, and its rotating accuracy can reach below the 0.003mm.

Internal grinder of the present utility model can be horizontal (as Fig. 4), vertical (as Fig. 5) or by existing grinding machine repacking (as Fig. 6).

Headstock hollow main shaft 2 also can be selected rolling bearing main shaft or sliding bearing main shaft, can reach the purpose of this utility model equally.

Claims (3)

1. an internal grinder is characterized in that: two bistriques that are provided with in opposite directions are housed on the main guide rail of lathe bed, but the headstock hollow main shaft of clamping workpiece is housed between two bistriques.

2. internal grinder according to claim 1 is characterized in that: headstock hollow main shaft is high rotating accuracy hydrostatic spindle.

3. internal grinder according to claim 1 is characterized in that: headstock hollow main shaft is rolling bearing main shaft or sliding bearing main shaft.

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