CN103921172B - The aligning method of guiding die plate and centering assembly thereof - Google Patents

The aligning method of guiding die plate and centering assembly thereof Download PDF

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Publication number
CN103921172B
CN103921172B CN201410190195.0A CN201410190195A CN103921172B CN 103921172 B CN103921172 B CN 103921172B CN 201410190195 A CN201410190195 A CN 201410190195A CN 103921172 B CN103921172 B CN 103921172B
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China
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inspection rod
workpiece
die plate
essence
guiding die
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CN103921172A (en
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卢明
邱建春
江远桥
胡维民
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Guangxi Yuchai Machinery Co Ltd
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Guangxi Yuchai Machinery Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00Arrangements for observing, indicating or measuring on machine tools

Abstract

The invention discloses the aligning method of a kind of guiding die plate and centering assembly thereof, this guiding die plate is provided with fairlead installing hole, this aligning method comprises the steps: step 1, it is provided that a kind of standard workpiece, and the medial surface of standard workpiece has the workpiece inspection rod hole mated with fairlead installing hole;Step 2, it is provided that a kind of Rough Inspection rod, by the big end of Rough Inspection rod through fairlead installing hole, adjusts guiding die plate position and makes the small end of Rough Inspection rod and interlude penetrate workpiece inspection rod hole successively and carry out rough alignment;Step 3, a kind of essence inspection rod and workpiece inspection rod are provided, essence inspection rod small end is provided with lever indicator, hold through fairlead installing hole by big for essence inspection rod, the workpiece big end of inspection rod is loaded in workpiece inspection rod hole, utilizes the top side bus of lever indicator detection workpiece inspection rod small end, front side bus and coaxiality error and carry out accurate centering according to this error transfer factor guiding die plate position.Guiding die plate on-the-spot can be carried out centering by the method, easy to operate.

Description

The aligning method of guiding die plate and centering assembly thereof
Technical field
The present invention relates to machine tool field, particularly to aligning method and the centering assembly thereof of a kind of guiding die plate.
Background technology
In machine tooling, need to install the guiding die plate of process tool on the base of lathe, guiding die plate (abbreviation template) is installed the processing director element such as drill bushing, bushing, when installation form, the centering required precision of template is very high, processing otherwise can be caused defective.At present, the multiplex following two method of installation form: the 1. base of lathe, template are transported to machine room, the coordinate between alignment pin and template bottom outlet, the depth of parallelism (perpendicularity) deviation is detected with three coordinate machine, according to deviation adjustment template position until meeting the requirements, then lathe is transported back workshop trial cut, detection, adjusted, so circulation operation until process qualified, finally equipped Template Location pin;2. lathe headstock, template are adjusted coaxial, are slightly arranged on lathe, then trial cut, detection, adjustment (adjust and to move main spindle box and template simultaneously), so circulation operation until process qualified, finally equipped guiding die plate alignment pin.
Above method needs large-scale precision three apparatus of coordinate detecting and sufficient debugging time, especially, when needing new improvement and installation template and without the condition of being suitable for coordinate between three coordinate machine detection and location pin and template bottom outlet, it is accomplished by repeatedly debugging, adjust the position height etc. of the elements such as repair lathe headstock, template, alignment pin, locating piece, complicated operation, workload length big, consuming time, poor effect.
Summary of the invention
The present invention is to overcome defect in above-mentioned prior art, it is provided that the aligning method of a kind of guiding die plate and centering assembly thereof, it is possible to guiding die plate is carried out centering by scene, and instrument is simple, easy to operate, improves debugging efficiency.
For achieving the above object, the invention provides the aligning method of a kind of guiding die plate, the method is accurately arranged on the base of lathe for being directed to template, this guiding die plate is provided with fairlead installing hole, it is characterized in that, this aligning method comprises the steps: step 1, it is provided that a kind of standard workpiece is also arranged on the base of lathe, having workpiece inspection rod hole on the medial surface of standard workpiece, workpiece inspection rod hole is mated with fairlead installing hole;Step 2, a kind of Rough Inspection rod of offer, Rough Inspection rod has big end, small end and interlude, and big by Rough Inspection rod is held through fairlead installing hole, adjusting guiding die plate position makes the small end of Rough Inspection rod and interlude penetrate workpiece inspection rod hole successively and carry out rough alignment, and takes out Rough Inspection rod;Step 3, a kind of essence inspection rod and workpiece inspection rod are provided, essence inspection rod has the essence big end of inspection rod and essence inspection rod small end, workpiece inspection rod has the workpiece big end of inspection rod and workpiece inspection rod small end, essence inspection rod small end is provided with lever indicator, hold through fairlead installing hole by big for essence inspection rod, the workpiece big end of inspection rod is loaded in workpiece inspection rod hole, utilize the lever indicator detection workpiece inspection rod top side of small end or lower side bus error, front side or last side bus error and coaxiality error to carry out accurate centering adjusting guiding die plate position, and unload essence inspection rod and workpiece inspection rod.
In technique scheme, the medial surface of standard workpiece is provided with two workpiece inspection rod holes, two workpiece inspection rod holes adapt with two fairlead installing holes on guiding die plate, repeat step 2 and 3, the workpiece inspection rod top side of small end being arranged in another workpiece inspection rod hole or lower side bus error, front side or last side bus error and coaxiality error are detected, according to this error correction guiding die plate position.
In technique scheme, the end face of essence inspection rod small end is provided with two lever indicators and the workpiece inspection rod top side of small end or lower side bus error, front side or last side bus error and coaxiality error is detected simultaneously.
In technique scheme, the cylindricity franchise of Rough Inspection rod is 0.03mm, the diameter 0.02mm less of the diameter of fairlead installing hole of the big end of Rough Inspection rod, the diameter 0.5mm less of the diameter in workpiece inspection rod hole of the small end of Rough Inspection rod, the diameter 0.1mm less of the diameter in workpiece inspection rod hole of the interlude of Rough Inspection rod.
In technique scheme, the cylindricity franchise of essence inspection rod is 0.01mm, the diameter 0.002-0.005mm less of the diameter of fairlead installing hole of the big end of essence inspection rod.
In technique scheme, the excellent end greatly of essence inspection is provided with the gathering sill that two place's angles are 90 °, dismountable guide plate that is provided with at the back side of guiding die plate, and the lower end of guide plate is inserted in gathering sill and carried out circumferential spacing to essence inspection rod.
Present invention also offers the centering assembly of a kind of guiding die plate, it is accurately arranged on the base of lathe for being directed to template, this guiding die plate is provided with fairlead installing hole, centering assembly includes: standard workpiece, having workpiece inspection rod hole on its medial surface, workpiece inspection rod hole is mated with fairlead installing hole;Rough Inspection rod, it has big end, small end and interlude, and the big end of Rough Inspection rod is used for mating with fairlead installing hole, and the small end of Rough Inspection rod and interlude are used for penetrating workpiece inspection rod hole successively and carry out rough alignment;Essence inspection rod, it has the essence big end of inspection rod and essence inspection rod small end, and the big end of essence inspection rod is used for mating with fairlead installing hole, and essence inspection rod small end is provided with lever indicator;And workpiece inspection rod, it has the workpiece big end of inspection rod and workpiece inspection rod small end, the big end of workpiece inspection rod is used for mating with workpiece inspection rod hole, lever indicator is used for detecting the workpiece inspection rod top side of small end or lower side bus error, front side or last side bus error and coaxiality error, and according to this error transfer factor guiding die plate position.
In technique scheme, the medial surface of standard workpiece is provided with two workpiece inspection rod holes, and two workpiece inspection rod holes adapt with two fairlead installing holes on guiding die plate.
In technique scheme, the end face of essence inspection rod small end is provided with two lever indicators for detecting the workpiece inspection rod top side of small end or lower side bus error, front side or last side bus error and coaxiality error simultaneously.
Compared with prior art, there is advantages that the workpiece mated with standard workpiece by designing standard workpiece is examined excellent and coarse-fine inspection rod and carried out rough and accurate two step centerings, at the scene guiding die plate can being carried out centering, instrument is simple, easy to operate.Especially, efficiently solving new transformation template, to debug accuracy at the scene not high, and the shortcoming of debugging time length is easy and simple to handle, improves debugging efficiency.
Accompanying drawing explanation
Fig. 1 be the present invention guiding die plate aligning method in the schematic diagram of detection top side bus;
Fig. 2 be the present invention guiding die plate aligning method in the schematic diagram of Rough Inspection rod rough alignment guiding die plate;
Fig. 3 is the main TV structure schematic diagram of Plays workpiece of the present invention;
Fig. 4 is the left view structural representation of Plays workpiece of the present invention;
Fig. 5 is the main TV structure schematic diagram of guiding die plate in the present invention;
Fig. 6 is the left view structural representation of guiding die plate in the present invention;
Fig. 7 is the structural representation of Rough Inspection rod in the present invention;
Fig. 8 is the structural representation of essence inspection rod in the present invention;
Fig. 9 is the left view schematic diagram of essence inspection rod in the present invention;
Figure 10 be in Fig. 8 along A to schematic diagram;
Figure 11 is the structural representation of workpiece inspection rod in the present invention;
Figure 12 is the cross-sectional schematic of guide plate in the present invention;
Figure 13 is the structural representation of guide plate in the present invention;
Figure 14 be the present invention guiding die plate aligning method in detect the schematic diagram of front side bus;
Figure 15 be the present invention guiding die plate aligning method in detect the schematic diagram of top side bus and front side bus simultaneously;
Figure 16 be the present invention guiding die plate aligning method in detect the schematic diagram of axiality.
In conjunction with accompanying drawing labelling the following drawings labelling thereon:
1-guiding die plate, 11-guide plate screw, 12-fairlead installing hole, 15-guide plate screw, 16-base, 2-essence inspection rod, 21-gathering sill, 22-fastens screw, 23-installs inclined hole, 24-essence inspection rod small end, the big end of 25-essence inspection rod, 26-essence inspection rod annular knurl, 3-lever indicator, 31-installs axle, 32-dial plate, 33-spheric probe, 4-workpiece inspection rod, 41-drawing screw, the flat plane of 42-, the big end of 43-workpiece inspection rod, 44-workpiece inspection rod small end, 5-standard workpiece, 51-workpiece inspection rod hole, 52-workpiece dowel hole, 6-locating piece, 7-alignment pin, 8-Rough Inspection rod, 81-Rough Inspection rod annular knurl, the big end of 82-, 83-interlude, 84-small end, 9-trip bolt, 10-guide plate, 101-elongated slot.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, it is to be understood that protection scope of the present invention is not by the restriction of detailed description of the invention.
As shown in Figure 1 to Figure 2, the aligning method of guiding die plate provided by the invention is accurately arranged on the base of lathe for being directed to template, and this guiding die plate is provided with fairlead installing hole, and this aligning method comprises the steps:
Step 1, it is provided that a kind of standard workpiece 5 is also arranged on the base 16 of lathe, the medial surface of standard workpiece 5 has workpiece inspection rod hole 51, and workpiece inspection rod hole 51 is mated with fairlead installing hole 12;
Step 2, a kind of Rough Inspection rod 8 is provided, Rough Inspection rod 8 has big end 82, small end 84 and interlude 83, by the big end 82 traverse fairlead installing hole 12 of Rough Inspection rod 8, adjusting guiding die plate 1 position makes the small end 84 of Rough Inspection rod 8 and interlude 83 penetrate workpiece inspection rod hole 51 successively and carry out rough alignment, and takes out Rough Inspection rod 8;
Step 3, a kind of essence inspection rod 2 and workpiece inspection rod 4 are provided, essence inspection rod 2 has the essence big end 25 of inspection rod and essence inspection rod small end 24, workpiece inspection rod 4 has the workpiece big end 43 of inspection rod and workpiece inspection rod small end 44, essence inspection rod small end 24 is provided with lever indicator 3, by big for essence inspection rod end 25 traverse fairlead installing hole 12, by in workpiece inspection rod big end 43 loading workpiece inspection rod hole 51, lever indicator 3 is utilized to detect top side or the lower side bus error of workpiece inspection rod small end 44, front side or last side bus error and coaxiality error carry out accurate centering according to this error transfer factor guiding die plate 1 position, and unload essence inspection rod 2 and workpiece inspection rod 4.
Finally, the guiding die plate of accurate centering position is fixed on the base 16 of lathe.
As a kind of preferred embodiment, the medial surface of standard workpiece 5 is provided with two workpiece inspection rod holes, two workpiece inspection rod holes adapt with two fairlead installing holes on guiding die plate 1, repeat step 2 and 3, top side or lower side bus error to another workpiece inspection rod hole 51, front side or last side bus error and coaxiality error are detected, the amount of deflection in comprehensive two holes adjusts guiding die plate 1, make top side or the lower side bus error in two holes, front side or last side bus error and coaxiality deviation are within 40:0.01mm, coaxiality deviation is within 0.05mm, namely accurate centering guiding die plate position it is finally completed.The present embodiment illustrates with top side bus error, front side bus error and coaxiality error measurement object.
Specifically using a kind of centering assembly in the guiding die plate centering process that the present embodiment provides, centering assembly includes: standard workpiece 5, Rough Inspection rod 8, essence inspection rod 2, workpiece inspection rod 4 and lever indicator 3.
Wherein, as shown in Figures 3 and 4, standard workpiece 5 and treat that centering guiding die plate 1 is corresponding with specific product, standard workpiece 5 is specifically processed according to technological requirement, workpiece inspection rod hole 51 on standard workpiece 5 is mated with the fairlead installing hole 12 treated on centering guiding die plate, workpiece inspection rod hole 51 is that the work in-process heart is processed by corresponding coordinate right boring, and workpiece inspection rod hole 51 can carry out expanding treatment for coordinating with workpiece inspection rod 4 when ensureing position degree.The position degree franchise in workpiece inspection rod hole 51 is Φ 0.05mm, and dowel hole line depth of parallelism franchise is 0.01mm by its axis.It is provided with workpiece dowel hole 52 in the bottom surface of standard workpiece 5, workpiece dowel hole 52 mates with the alignment pin 7 on base 16, placement positioning block 6 (all locating pieces 6 need to polish contour) on base 16, standard workpiece 5 is placed on locating piece 6 and workpiece dowel hole 52 takes minimum clearance and coordinates (for improving positioning precision) with alignment pin 7, so, namely standard workpiece 5 is installed and is clamped on base 16.
As shown in Figures 5 and 6, the fairlead installing hole 12 on guiding die plate 1 is suitable with workpiece inspection rod hole 51 coordinate, and its position degree franchise is Φ 0.05mm, and dowel hole line depth of parallelism franchise is 0.01mm by its axis.Guide plate screw 11 (also can use gland screw hole) is processed above fairlead installing hole 12.
As shown in Figure 7, Rough Inspection rod 8 cylindricity franchises are 0.03mm, the big end 82 diameters 0.02mm less of fairlead installing hole 12 diameter of Rough Inspection rod, Rough Inspection rod 8 is through can flexible rotating after fairlead installing holes 12, the small end 84 diameter 0.5mm less of the diameter in workpiece inspection rod hole 51 of Rough Inspection rod, easily penetrate in workpiece inspection rod hole 51 and be easy to preliminary centering, adjusting guiding die plate position makes the small end 84 of Rough Inspection rod penetrate workpiece inspection rod hole 51, carry out same operation again, the interlude 83 making Rough Inspection rod penetrates workpiece inspection rod hole 51, get final product rough alignment guiding die plate position, the diameter of Rough Inspection rod interlude 83 0.1mm less of the diameter in workpiece inspection rod hole 51, now centering precision is 0.12mm.Rough Inspection rod annular knurl 81 is easy to hand-held torquing operations.
As shown in Fig. 8, Fig. 9 and Figure 10, it is 0.01mm that essence examines excellent 2 cylindricity franchises, the diameter 0.002-0.005mm less of the diameter of fairlead installing hole 12 of the big end 25 of essence inspection rod, higher accuracy of detection can be obtained, the gathering sill 21 having two place's angles to be 90 ° on the big end 25 of essence inspection rod, the guide plate 10 width ratio gathering sill 21 little 0.01mm of width, guide plate is put into gathering sill 21, then tighten guide plate screw 15 and fasten guide plate 10, make essence inspection rod 2 can only move axially and can not rotate, reduce detection error;Lever indicator 3 is installed in the installation inclined hole 23 of lever indicator that axle 31 loads essence inspection rod small end 24 end face, trip bolt 9 tightens lever indicator 3 by fastening screw 22, adjust spheric probe 33 and be in workpiece inspection rod bus place, small end 44 top side, installation inclined hole 23 axis of lever indicator favours horizontal line, so that lever indicator 3 has between its main body and workpiece inspection rod small end 44 after loading enough dodges space, the bus amount of deflection of sufficient length can be detected.For improving efficiency, the installation inclined hole 23 of lever indicator that essence inspection rod small end 24 end face has two place's angles to be 90 °, can fill two lever indicators 3 detect simultaneously top side bus error with on front side of bus error (referring to Figure 15).Essence inspection rod annular knurl 26 is easy to hand-held torquing operations.
As shown in Fig. 1 and Figure 14, when concrete detection top side bus error is with front side bus error, workpiece inspection rod 4 is loaded in workpiece inspection rod hole 51, be that the tight fit of magnitude of interference 0.02mm, drawing screw 41 and flat plane 42 are readily accessible with spanner torquing operations (referring to Figure 11) between the big end 43 of workpiece inspection rod and workpiece inspection rod hole 51.The direction of arrow moves essence inspection rod 2 as shown in Figure 1, and dial plate 32 pointer changing value is top side bus deviation.Then, referring to Fig. 1, unclamping guide plate screw 15, along the upwardly directed mobile guide plate 10 of elongated slot 101 (referring to Figure 12 and Figure 13), rotation essence inspection rod 90 °, by bus (referring to Figure 14) on front side of same method detection.If the top side bus deviation of detection is relatively big, then can readjust the height of locating piece 6;If the front side bus deviation of detection is big, then adjusting the position (horizontal shifting or swing) of guiding die plate 1 accordingly, top side bus or front side bus franchise are 40:0.01mm.
As shown in figure 16, when concrete detection axiality, essence inspection rod 2 is rotated a circle, dial plate 32 pointer changing value is coaxiality deviation, if coaxiality deviation is big, then adjusting the position (horizontal shifting or swing) of guiding die plate 1 accordingly, axiality franchise is 0.05mm.
In a word, rod 4 examined by the workpiece mated with standard workpiece 5 by designing standard workpiece 5 and coarse-fine inspection rod carries out rough and accurate centering, it is possible at the scene guiding die plate being carried out centering, instrument is simple, easy to operate.
Especially, the aligning method of the guiding die plate of the present invention and centering assembly thereof efficiently solve new transformation template to debug accuracy at the scene not high, and the shortcoming of debugging time length is easy and simple to handle, improves debugging efficiency.
The specific embodiments of the invention that are only disclosed above, but, the present invention is not limited to this, and the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.

Claims (9)

1. an aligning method for guiding die plate, the method is accurately arranged on the base of lathe for being directed to template, and this guiding die plate is provided with fairlead installing hole, it is characterised in that this aligning method comprises the steps:
Step 1, it is provided that a kind of standard workpiece is also arranged on the base of lathe, the medial surface of described standard workpiece has workpiece inspection rod hole, and described workpiece inspection rod hole is mated with described fairlead installing hole;
Step 2, a kind of Rough Inspection rod is provided, described Rough Inspection rod has big end, small end and interlude, big by described Rough Inspection rod is held through fairlead installing hole, adjusting guiding die plate position makes the small end of described Rough Inspection rod and interlude penetrate described workpiece inspection rod hole successively and carry out rough alignment, and takes out described Rough Inspection rod;
Step 3, a kind of essence inspection rod and workpiece inspection rod are provided, described essence inspection rod has the essence big end of inspection rod and essence inspection rod small end, described workpiece inspection rod has the workpiece big end of inspection rod and workpiece inspection rod small end, described essence inspection rod small end is provided with lever indicator, hold through described fairlead installing hole by big for described essence inspection rod, the described workpiece big end of inspection rod is loaded in described workpiece inspection rod hole, described lever indicator is utilized to detect top side or the lower side bus error of described workpiece inspection rod small end, front side or last side bus error and coaxiality error adjust described guiding die plate position and carry out accurate centering, and unload described essence inspection excellent and described workpiece inspection rod.
2. the aligning method of guiding die plate according to claim 1, it is characterized in that, the medial surface of described standard workpiece is provided with two workpiece inspection rod holes, two workpiece inspection rod holes adapt with two fairlead installing holes on described guiding die plate, repeating said steps 2 and 3, the workpiece inspection rod top side of small end being arranged in another workpiece inspection rod hole or lower side bus error, front side or last side bus error and coaxiality error are detected, according to this error correction guiding die plate position.
3. the aligning method of guiding die plate according to claim 1, it is characterized in that, the end face of described essence inspection rod small end is provided with two lever indicators and the described workpiece inspection rod top side of small end or lower side bus error, front side or last side bus error and coaxiality error is detected simultaneously.
4. the aligning method of the guiding die plate according to any one of claims 1 to 3, it is characterized in that, the cylindricity franchise of described Rough Inspection rod is 0.03mm, the diameter 0.02mm less of the diameter of described fairlead installing hole of the big end of described Rough Inspection rod, the diameter 0.5mm less of the diameter in described workpiece inspection rod hole of the small end of described Rough Inspection rod, the diameter 0.1mm less of the diameter in described workpiece inspection rod hole of the interlude of described Rough Inspection rod.
5. the aligning method of guiding die plate according to claim 4, it is characterised in that the cylindricity franchise of described essence inspection rod is 0.01mm, the diameter 0.002-0.005mm less of the diameter of described fairlead installing hole of the described essence big end of inspection rod.
6. the aligning method of guiding die plate according to claim 5, it is characterized in that, the described essence big end of inspection rod is provided with the gathering sill that two place's angles are 90 °, dismountable guide plate that is provided with at the back side of described guiding die plate, the lower end of described guide plate is inserted in described gathering sill and is carried out circumferential spacing to described essence inspection rod.
7. a centering assembly for guiding die plate, it is accurately arranged on the base of lathe for being directed to template, and this guiding die plate is provided with fairlead installing hole, it is characterised in that described centering assembly includes:
Standard workpiece, its medial surface has workpiece inspection rod hole, and described workpiece inspection rod hole is mated with described fairlead installing hole;
Rough Inspection rod, it has big end, small end and interlude, and the big end of described Rough Inspection rod is used for mating with described fairlead installing hole, and the small end of described Rough Inspection rod and interlude are used for penetrating described workpiece inspection rod hole successively and carry out rough alignment;
Essence inspection rod, it has the essence big end of inspection rod and essence inspection rod small end, and the described essence big end of inspection rod is used for mating with described fairlead installing hole, and described essence inspection rod small end is provided with lever indicator;And
Workpiece inspection rod, it has the workpiece big end of inspection rod and workpiece inspection rod small end, the big end of described workpiece inspection rod is used for mating with described workpiece inspection rod hole, described lever indicator is used for detecting the described workpiece inspection rod top side of small end or lower side bus error, front side or last side bus error and coaxiality error, and according to this error transfer factor guiding die plate position.
8. the centering assembly of guiding die plate according to claim 7, it is characterised in that the medial surface of described standard workpiece is provided with two workpiece inspection rod holes, two workpiece inspection rod holes adapt with two fairlead installing holes on described guiding die plate.
9. the centering assembly of guiding die plate according to claim 8, it is characterized in that, the end face of described essence inspection rod small end is provided with two lever indicators for detecting the described workpiece inspection rod top side of small end or lower side bus error, front side or last side bus error and coaxiality error simultaneously.
CN201410190195.0A 2014-05-07 2014-05-07 The aligning method of guiding die plate and centering assembly thereof Active CN103921172B (en)

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CN105180765A (en) * 2015-09-07 2015-12-23 成都飞机工业(集团)有限责任公司 Internal measuring lever type dial gauge combination boring machine alignment measuring tool

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US5704132A (en) * 1996-01-16 1998-01-06 Bourne; E. T. Indicator holder with slidable connecting member
CN201208706Y (en) * 2008-06-20 2009-03-18 聂福全 Mechanical lever type center corrector for center lathe
CN101592464A (en) * 2009-04-21 2009-12-02 寿震森 Position degree detecting component
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