CN102012204B - Precision detection device and method for numerical control static pressure rotary table - Google Patents

Abstract

The precision detection device comprises a leakage amount detection device of a main guide rail constant-current static pressure oil cavity, a reverse gap and mandrel gap detection device and a verticality detection device for installation of a mandrel excircle and a base main guide rail. A precision detection method of a numerical control static pressure rotary table, a) comprises the steps of detecting the leakage amount of a main guide rail constant-current static pressure oil cavity; b) comprises the step of detecting a reverse gap; c) the method comprises the steps of detecting the clearance of the mandrel; d) the method comprises the step of detecting the installation verticality of the excircle of the mandrel and the main guide rail of the base. The invention mainly aims at key indexes of the turntable, such as floating amount, reverse clearance, mandrel clearance, perpendicularity and the like, which influence the indexing precision and repeated positioning precision of the turntable, and provides a detection device and a detection method. The method for testing the precision of the rotary table is simple and reliable, the device is convenient to operate, and a basis is provided for testing and adjusting the precision of the rotary table; the precision testing device and the method are also suitable for other turntables and numerical control equipment.

Description

The accuracy detecting device of numerical control static pressure turntable and method

Technical field

The present invention relates to a kind of accuracy test device and method of numerical control static pressure turntable, belong to lathe detection technique field.

Background technology

2010 annual high-grade, digitally controlled machine tools and basis make that equipment is great specially classifies the primary study content as with " at a high speed, accurate digital control rotary table ", list supporting precision testing device in research topic simultaneously; Special turntable " the load-bearing 30-60T that requires; Indexing accuracy is 6 ", product manufacturing accuracy, load capacity, serviceable life and reliability are near international like product advanced level ".The numerical control static pressure turntable is the critical function parts of high-grade, digitally controlled machine tools, accounts for 1/4～1/3 of lathe cost.Domestic high precision turntable is compared with the state outer turret, and all there are certain gap in reliability, durability and precision stability.It is big to influence between numerous and each factor of turntable factors of accuracy the degree of coupling, and in order to distinguish the rule that influences between each factor, the accuracy test device of numerical control static pressure turntable of the present invention and method are primarily aimed at the detection of several crucial precision indexs of turntable.

The index relevant with numerical control static pressure turntable precision comprises two classes: a class is direct precision index, comprises 4: indexing accuracy and repetitive positioning accuracy, table top flatness and face runout, diameter run-out; Another kind of is indirect precision index, and it comprises 7: floatation volume, backlass, mandrel gap and verticality, turntable calibration minor cycle error, low-speed stability, coupling mechanism force and damping characteristic with directly precision index is in close relations.Wherein, two technical indicators of evaluation numerical control rotating platform most critical are indexing accuracy and repetitive positioning accuracy, and they are general performances of above-mentioned every error.

Summary of the invention

The present invention is primarily aimed at the key index that turntable floatation volume, backlass, mandrel gap and verticality etc. influence turntable indexing accuracy and repetitive positioning accuracy, and pick-up unit and method are provided.

Numerical control static pressure turntable accuracy detecting device of the present invention and method are intended to set forth detection method, the design corollary apparatus of the every technical indicator relevant with the static pressure turntable precision.Outstanding advantage is: method of testing of the present invention is reliable, and is simple in structure, by the detection and the control of the every precision index of turntable, improves the assembly quality and the efficient of turntable.

Technical scheme of the present invention is as follows:

A kind of accuracy detecting device of numerical control static pressure turntable, the leakage amount detector that comprises main guide rail constant current static pressure oil pocket, the leakage amount detector of main guide rail constant current static pressure oil pocket comprise the frequency converter of control multi-head pump motor speed, the multi-head pump of control main guide rail constant current static pressure oil pocket oil inlet quantity; Also comprise backlass and mandrel gap detection device, backlass and mandrel gap detection device comprise first dial gauge that sets up the circumferencial direction that is the floral disc edge, the 3rd dial gauge that is used to monitor second dial gauge of endless screw support axial runout and is used to monitor the endless screw support diameter run-out; Also comprise mandrel cylindrical and base main guide rail installation testing apparatus for verticality, the mandrel cylindrical is installed testing apparatus for verticality with the base main guide rail and is comprised the dial gauge that is erected at the main guide rail upside and contacts with leading rail level, the dial gauge support that on the vertical lathe knife rest, sets up, the dial gauge of putting on the shelf 2 and being horizontally disposed with and contacting at the dial gauge support with the mandrel periphery.

Described backlass and mandrel gap detection device also are included in four uniform hydraulic locking oil cylinders of circumferencial direction of base, therein an oil cylinder directly over be provided with the 4th dial gauge along the radial shelf of turntable.

A kind of accuracy checking method of numerical control static pressure turntable,

A) comprise the step of the leakage rate that detects main guide rail constant current static pressure oil pocket:

Under no-load condition, by the rotating speed of Frequency Converter Control multi-head pump variable-frequency motor, thereby regulate the oil inlet quantity of every of the constant current static pressure oil pocket of the main guide rail between base and the floral disc, the rotating speed of control multi-head pump variable-frequency motor is 100%: measure multi-head pump flow Q ₀And oil film thickness h ₀The rotating speed of control multi-head pump variable-frequency motor is B%: measure multi-head pump flow B%Q ₀And oil film thickness h ₁Wherein the oil film thickness value is similar to and gets the arithmetic mean of turntable main guide rail floatation volume multimetering.

By the leakage rate formula:

$Q_l=\frac{B\%h_0^3-{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="101124135230.png,101124135242.png"\; state="\{\{state\}\}">h</figure-callout>}}_1^3}{h_0^3-{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="101124135230.png,101124135242.png"\; state="\{\{state\}\}">h</figure-callout>}}_1^3}{Q}_0$

Obtain the leakage rate of main guide rail constant current static pressure oil pocket;

Corresponding slip:

${\mathrm{\&eta;}}_l=\frac{B\%h_0^3-{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="101124135230.png,101124135242.png"\; state="\{\{state\}\}">h</figure-callout>}}_1^3}{h_0^3-{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="101124135230.png,101124135242.png"\; state="\{\{state\}\}">h</figure-callout>}}_1^3}$

B) comprise the step that detects backlass: comprise the backlass that detects worm and gear meshing backlass and endless screw transmission agent; Under the turntable normal operating conditions, frame first dial gauge is in the circumferencial direction at floral disc edge, and frame is monitored second dial gauge of endless screw support axial runout and the 3rd dial gauge of diameter run-out simultaneously; After turntable was walked LAP counterclockwise, the shake pulses generator changed until first dial gauge in the other direction, reads the comprehensive backlass that the first dial gauge idle motion promptly obtains turntable; Manually pull work top respectively counterclockwise and clockwise, the openhanded reading of opening on the record first dial gauge both direction of back, its difference promptly obtains the worm and gear meshing backlass after being converted to reference circle of wormwheel; The difference of calculating comprehensive backlass of turntable and worm and gear meshing backlass is the backlass of endless screw transmission agent;

C) comprise the step that detects the mandrel gap: at uniform four the hydraulic locking oil cylinders of the circumferencial direction of base, with one of them oil cylinder as demarcating oil cylinder; Demarcate oil cylinder directly over along radial shelf the 4th dial gauge of turntable, do not work and under the situation of off-load main guide rail operate as normal at the static pressure mandrel, logical pressure oil in demarcating oil cylinder and an oil cylinder relative successively with it, the difference that reads the 4th dial gauge obtains the mandrel gap;

D) comprise the step that detects mandrel cylindrical and base main guide rail installation verticality: the assembly of base and mandrel is placed on the vertical lathe, on main guide rail, set up a dial gauge C, the control main guide rail is beated in 0.03mm, and the leading rail level of this moment is as horizontal reference; On the vertical lathe knife rest, be provided with the dial gauge support, dial gauge support put on the shelf 2 horizontally disposed dial gauge A and dial gauge B, the distance of dial gauge A and dial gauge B equals the significant height of mandrel, its measuring head contact mandrel cylindrical, the rotate a circle variation amplitude of back dial gauge A and dial gauge B of vertical lathe is designated as Δ A and Δ B respectively, and the verticality that obtains mandrel cylindrical and base main guide rail is | Δ A-Δ B|/2.

The measurement of backlass is carried out calibration by 12 equal portions measurement points in the described step b), even measured value, and error control simultaneously, is monitored second dial gauge and the 3rd dial gauge can not change in 0.02mm.

Also comprise the step that adopts the method identical to detect the verticality of worm gear hub endoporus and floral disc main guide rail with step d).

The accuracy detecting device of numerical control static pressure turntable and method are primarily aimed at several key indexs that influence turntable indexing accuracy and repetitive positioning accuracy: floatation volume, backlass, mandrel gap and verticality, can realize accurate and reliable detection.The quiet panoramic table of the numerical control that the present invention detected is made up of 4 big parts: support unit, calibration rotary part, worm screw parts and hydraulic radial clamp device; Support unit is made up of base 4 and mandrel 1, and the calibration rotary part is made up of floral disc 3 and worm gear hub 2, and the worm screw parts mainly are made up of endless screw support 8 and worm screw 9, and hydraulic clamp is made up of hydraulic locking oil cylinder 5 and clamp; The constant-current hydrostatic bearing that the radial location of turntable relies on mandrel 1 cylindrical and worm gear hub 2 endoporus to form, diametric(al) oil film thickness 0.06～0.10mm, oil pocket pressure 1.5～2MPa; Axial location relies on the constant current static pressure open type guide rail of base 4 and floral disc 3, by the step-less adjustment of frequency converter realization multi-head pump flow, oil film thickness 0.02～0.04mm; Adopt two helical pitch worm and gears to carry out precision indexing, back lash 0.02～0.04mm axially clamps and relies on 4 uniform hydraulic clamps that are fixed on the base 4.

The further technical scheme of the accuracy detecting device of numerical control static pressure turntable of the present invention and method is that described static pressure turntable adopts the constant current guide rail to carry out axially mounting, and oil film thickness and guide rail structure parameter, to carry size, oil sealing characteristic, fluid character relevant; For better control oil film thickness and oil film rigidity, draw the slip of main guide rail by leakage rate detection apparatus, fly one of detection index of scraping quality as weighing main guide rail; Described leakage rate detection apparatus is made up of frequency converter, multi-head pump and dial gauge, and the guide rail slip is controlled in 30% when unloaded.

The further technical scheme of the accuracy detecting device of numerical control static pressure turntable of the present invention and method is the comprehensive backlass of described turntable, the backlass that comprises worm and gear meshing backlass and endless screw transmission agent, worm and gear backlass 0.02～0.04mm, account for 1/2～2/3 of the comprehensive backlass of turntable, the error of turntable optional position is in 0.02mm.Utilize hand to pull the table top method and detect turntable worm and gear meshing backlass, detect the comprehensive backlass of turntable by hand pulse producer method, method is simple.

The further technical scheme of the accuracy detecting device of numerical control static pressure turntable of the present invention and method is 4 hydraulic clamps of described mandrel gap detection by means of turntable, and pick-up unit is gathered materials on the spot, and does not increase any servicing unit; Consider the requirement of mismachining tolerance, rigging error and oil film rigidity, 0.06～0.10mm is got in the mandrel gap on diametric(al).

The further technical scheme of the accuracy detecting device of numerical control static pressure turntable of the present invention and method is that described mandrel cylindrical and base main guide rail installation verticality can detect by two dial gauge differential techniques, the rotate a circle difference of variation amplitude of latter two dial gauge of vertical lathe is not designated as Δ A and Δ B, and then the verticality of mandrel cylindrical and base main guide rail is | Δ A-Δ B|/2.

The invention has the beneficial effects as follows:

Compared with prior art, accuracy detecting device of the present invention and method are primarily aimed at several key technical index that influence turntable indexing accuracy and repetitive positioning accuracy: floatation volume, backlass, mandrel gap and verticality, realize accurately detecting, improve the turntable assembly precision and detection efficiency.The slip of constant current hydrostatic slideway of the present invention and pick-up unit thereof, backlass and mandrel gap detection method, mandrel cylindrical and main guide rail testing apparatus for verticality can improve 0.5～1 times of the detection efficiency of turntable precision index, and method is simple and reliable.Constant current hydrostatic slideway slip 30% when qualified after testing static pressure turntable is unloaded, the comprehensive backlass 3 of turntable ", indexing accuracy 6 ", repetitive positioning accuracy 3 "; have high-speed smooth and low-speed stability preferably, reach 1720 hours average non-failure operation time (MTBF).

Turntable method for testing precision of the present invention is simple and reliable, install easy to operate, for turntable accuracy test and adjustment provide foundation; Accuracy test device of the present invention and method are suitable for other turntables and numerical control equipment equally.

Description of drawings

Fig. 1 is the structural representation of the static pressure turntable that the present invention detected.

Fig. 2 detects the hydraulic schematic diagram of slip for the present invention.

Fig. 3 is the detection synoptic diagram in backlass of the present invention and mandrel gap.

Fig. 4 is the detection synoptic diagram of mandrel cylindrical of the present invention and main guide rail verticality.

Part description among the figure: part description among the figure: 1, mandrel, 2, the worm gear hub, 3, floral disc, 4, base, 5, the hydraulic locking oil cylinder, 6, worm gear, 7, the worm gear gland, 8, endless screw support, 9, worm screw, 10, the dial gauge support.

Base 4 and mandrel 1 are rigidly connected, the cylindrical verticality 0.025mm of the main guide rail of base 4 and mandrel 1; Floral disc 3 is rigidly connected with worm gear hub 2, worm gear 6 is connected with 2 interference of worm gear hub, worm gear gland 7 is rigidly connected the interior hole perpendicularity 0.025mm of the main guide rail of floral disc 3 and worm gear hub 2 with worm gear hub 2; The major-minor guide rail of base 4 and floral disc 3 closes and grinds, and guarantees contact (area) pattern 12～16 points/25X25mm ²Worm screw 9 is installed in the endless screw support 8, and endless screw support 11, hydraulic locking oil cylinder 5 are rigidly connected with base 4.

Embodiment

Below in conjunction with accompanying drawing the technology of the present invention content is explained:

Fig. 1 represents to detect the structural representation of turntable, and the main guide rail between base 4 and the floral disc 3 adopts constant current static pressure fuel system, is divided into 6 oil pockets; Fig. 2 represents the detection hydraulic schematic diagram of main guide rail constant current static pressure oil pocket leakage rate, and the theoretical delivery sum that leakage rate and guide rail float is oil inlet quantity, " slip η _l" be the number percent that leakage rate accounts for total oil inlet quantity, be multivariate function along with factors vary such as floral disc base relative position, carrying, oil temperature, pressure unloading, flows.For the ease of detecting, only consider the relation of oil film thickness and flow; Under no-load condition, by the rotating speed of Frequency Converter Control multi-head pump variable-frequency motor, thereby regulate the oil inlet quantity of every of the constant current static pressure oil pocket of the main guide rail between base 4 and the floral disc 3, the big more oil film of oil inlet quantity is thick more.When turntable was unloaded, oil pocket pressure was only relevant with the weight of floating parts, oil pocket structure, fluid kinetic viscosity, had nothing to do with the change of flow, and oil inlet quantity and oil film thickness satisfy following formula:

$Q_i=Q_l+{\mathrm{Ah}}_i^3$

In the formula: Q _i---the flow of oil-in, calculate rotating speed with the multi-head pump motor and be directly proportional

Q _l---the flow of leakage, irrelevant with oil inlet quantity in theory, relevant with oil pocket pressure

---oil film thickness is h _iThe time theoretical delivery

First group of measurement data (motor speed 100%): multi-head pump flow Q ₀, oil film thickness h ₀

First group of measurement data (motor speed B%): multi-head pump flow B%Q ₀, oil film thickness h ₁

Write down theoretical oil film thickness neighbouring two groups of data, then leakage rates:

$Q_l=\frac{B\%h_0^3-{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="101124135230.png,101124135242.png"\; state="\{\{state\}\}">h</figure-callout>}}_1^3}{h_0^3-{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="101124135230.png,101124135242.png"\; state="\{\{state\}\}">h</figure-callout>}}_1^3}{Q}_0={\mathrm{\&eta;}}_l\&CenterDot;Q_0$

The theoretical oil film thickness h of main guide rail in the following formula ₀Get 0.02～0.04mm.B is any number between the 1-100%.

For ease of check, the slip of the theoretical oil film thickness correspondence when getting the turntable zero load generally gets 30% for calculating slip.If leading rail level adopts scraping, generally require 12～16 points/25X25mm ²When adopting the grinding guide pass, the flatness of guide pass, torsion resistance and the depth of parallelism must not surpass 1/4～1/3 of guide clearance.

Fig. 3 represents the detection method of backlass of the present invention.Common described backlass is meant the comprehensive backlass of turntable, comprises the backlass of worm and gear meshing backlass and endless screw transmission agent, and worm and gear meshing backlass 0.02～0.04mm accounts for 1/2～2/3 of the comprehensive backlass of turntable.Their detection method has certain difference: in the turntable normal operating conditions, frame first dial gauge 01 is in the circumferencial direction at floral disc edge, and frame is monitored second dial gauge 02 of endless screw support 8 axial runouts and the 3rd dial gauge 03 of diameter run-out well simultaneously; After turntable counterclockwise (+C direction) was walked LAP, the shake pulses generator changed until first dial gauge 01 in the other direction, and idle motion at this moment is the comprehensive backlass of turntable; Manually counterclockwise (+C direction) and clockwise (C direction) pulls work top respectively, the openhanded reading of opening on record first dial gauge 01 both direction of back, and its difference promptly obtains the worm and gear meshing backlass after being converted to reference circle of wormwheel; And the backlass of endless screw transmission agent is the poor of comprehensive backlass of turntable and worm and gear meshing backlass.Should be noted that: the measurement of backlass generally will be carried out calibration by 12 equal portions measurement points, and measured value must be evenly, and in the error 0.02mm, otherwise the turntable precision can reduce greatly; Simultaneously, second dial gauge 02 and the 3rd dial gauge 03 can not change, otherwise the resultant error of measuring is very big.

Fig. 3 also comprises mandrel gap detection method of the present invention.The mandrel gap has a significant impact the ability of turntable radial rigidity and antidumping moment; Consider the requirement of mismachining tolerance, rigging error and oil film rigidity, 0.06～0.10mm is got in the mandrel gap usually on diametric(al).At uniform four the hydraulic locking oil cylinders 5 of the circumferencial direction of base 4, be designated as the first oil cylinder 5-1, the second oil cylinder 5-2, the 3rd oil cylinder 5-3 and the 4th oil cylinder 5-4 respectively, with the 3rd oil cylinder 5-3 as demarcating oil cylinder; Demarcate oil cylinder directly over along radial shelf the 4th dial gauge 04 of turntable, do not work and under the situation of off-load main guide rail operate as normal at static pressure mandrel 1, logical pressure oil in demarcating oil cylinder and the first oil cylinder 5-1 relative successively with it, the difference of reading the 4th dial gauge 04 obtains the mandrel gap, requires floral disc circumferencial direction 6 equal portions to measure and observe its homogeneity.The tolerance on fit and the form and position tolerance of mandrel cylindrical and worm gear hub endoporus, the verticality that mandrel cylindrical and base main guide rail are installed verticality, worm gear hub endoporus and floral disc main guide rail all can influence the mandrel gap; Wherein, mandrel cylindrical and worm gear hub endoporus cooperate and form and position tolerance mainly guarantees by numerically-controlled machine, and the verticality of mandrel cylindrical and base main guide rail verticality, worm gear hub endoporus and floral disc main guide rail needs isolated plant to detect.

Fig. 4 represents the detection method of mandrel cylindrical and base main guide rail installation verticality, and the detection method of the verticality of worm gear hub endoporus and floral disc main guide rail is similar with it, repeats no more.Base 4 places on the vertical lathe with the assembly of mandrel 1, is benchmark with the main guide rail of base 4, and table C beats in the 0.03mm; Dial gauge support 10 put on the shelf 2 dial gauge A and dial gauge B, the rotate a circle cycle difference of back two tables of vertical lathe is designated as Δ A and Δ B respectively, the measuring head of dial gauge A and dial gauge B contacts mandrel 1 cylindrical, and then the verticality of mandrel cylindrical and base main guide rail is | Δ 4-Δ B|/2.

Embodiment recited above is described preferred implementation of the present invention; be not that design of the present invention and scope are limited; do not breaking away under the design concept prerequisite of the present invention; common engineering technical personnel make technical scheme of the present invention in this area various modification and improvement; all should fall into protection scope of the present invention, the technology contents that the present invention asks for protection all is documented in claims.

Claims (5)

1. A precision detection device for a numerically controlled static pressure turntable, characterized in that: Including the leakage detection device of the constant flow static pressure oil chamber of the main rail, the leakage detection device of the constant flow static pressure oil chamber of the main rail includes a frequency converter for controlling the motor speed of the multi-head pump, controlling the oil intake of the constant flow static pressure oil chamber of the main rail multi-head pump; It also includes a backlash and mandrel clearance detection device. The backlash and mandrel clearance detection device includes a first dial indicator erected on the edge of the faceplate in the circumferential direction, and a second dial indicator for monitoring the axial runout of the worm support. and a third dial indicator for monitoring the radial runout of the worm support; It also includes a verticality detection device installed between the outer circle of the mandrel and the main rail of the base. The dial indicator bracket erected on the knife rest has 2 dial indicators arranged horizontally and in contact with the cylindrical surface of the mandrel on the dial indicator bracket. 2. The device according to claim 1, characterized in that: the backlash and mandrel gap detection device also includes four hydraulic locking cylinders uniformly distributed in the circumferential direction of the base, directly above one of the cylinders A fourth dial indicator is erected along the radial direction of the turntable. 3. A precision detection method for a numerically controlled static pressure turntable, characterized in that: a) Including the steps of detecting the leakage of the constant flow hydrostatic oil chamber of the main rail: Under no-load conditions, the speed of the multi-head pump variable-frequency motor is controlled by the frequency converter, thereby adjusting the oil intake at each point of the constant-flow static pressure oil chamber of the main guide between the base and the faceplate, and the speed of the multi-head pump variable-frequency motor is controlled to 100 %: Measure the multi-head pump flow rate Q ₀ and oil film thickness h ₀ ; control the speed of the multi-head pump variable frequency motor to B%: measure the multi-head pump flow rate B% Q ₀ and oil film thickness h ₁ ; the oil film thickness value is approximately taken as the main turntable The multi-point measurement arithmetic mean of the floating amount of the guide rail; Through the leakage formula: ${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; B</span>}<span\; class="notranslate">\; \%</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}$ Obtain the leakage quantity Q _l and the leakage rate η _l of the main rail constant flow hydrostatic oil chamber; b) Including the step of detecting the backlash: including detecting the backlash of the worm gear and worm gear and the backlash of the worm drive system. In the normal working state of the turntable, set the first dial indicator in the circumferential direction of the edge of the faceplate, and set up the monitoring worm at the same time The second dial indicator for the axial runout of the bracket and the third dial indicator for the radial runout; after the turntable travels counterclockwise for a certain distance, shake the pulse generator in the opposite direction until the first dial indicator changes, and read the first percentage indicator The table empty stroke is the comprehensive backlash of the turntable; manually turn the worktable counterclockwise and clockwise respectively, and record the readings in the two directions of the first dial indicator after releasing the hand, and convert the difference to the worm gear index circle That is, the meshing backlash of the worm gear is obtained; the backlash of the worm transmission system is obtained by calculating the difference between the comprehensive backlash of the turntable and the meshing backlash of the worm gear; c) Including the step of detecting the clearance of the mandrel: four hydraulic locking cylinders are evenly distributed in the circumferential direction of the base, and one of the cylinders is used as a calibration cylinder; the fourth dial indicator is mounted along the radial direction of the turntable directly above the calibration cylinder , when the static pressure mandrel is not working and the unloading main rail is working normally, pass the pressure oil in the calibration oil cylinder and the opposite oil cylinder successively, and read the difference of the fourth dial gauge to get the mandrel clearance; d) Including the step of detecting the verticality between the outer circle of the mandrel and the main rail of the base: place the assembly of the base and the mandrel on the vertical lathe, and set up a dial indicator on the main rail based on the main rail of the base, The runout of the guide rail is monitored by the dial indicator within 0.03mm; the dial indicator bracket is set up on the vertical turning tool holder, and there are 2 horizontally arranged dial indicators A and B on the dial indicator bracket, and the measuring heads are in contact with each other. For the outer circle of the mandrel, the change amplitudes of the dial indicator A and the dial indicator B after one rotation of the vertical lathe are recorded as ΔA and ΔB respectively, and the perpendicularity between the outer circle of the mandrel and the main rail of the base is |ΔA-ΔB|/2 . 4. The method according to claim 3, characterized in that: the measurement of the backlash in the step b is divided by 12 equal parts of the measurement points, and the uniform measurement value is controlled within 0.02mm. The second dial indicator and the third dial indicator cannot be changed. 5. The method according to claim 3, further comprising the step of detecting the perpendicularity between the inner hole of the worm wheel hub and the main rail of the faceplate by the same method as step d.

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