A kind of processing method of water turbine control valveTechnical field
The present invention relates to machining, particularly a kind of processing method of water turbine control valve.
Background technology
Water turbine control valve is a kind of hydraulic pressure original paper being widely used in the hydraulic turbine and controlling, and be controlled by electro-control converter (proportioning valve), amplifying hydraulic flow and control servomotor, is a hydraulic pressure enlarger in essence.Be applicable to eddy current type, Kaplan formula, impact type and the water-storage formula hydraulic turbine.FC series of valves is the one in water turbine control valve, there is fast-response energy (response time <0.2s), unique is horizontally disposed, very high control accuracy (speed dead bend <4%%), with the exact matching of servomotor, be integrated with sequence closing function, servomotor unlatching, shut-in time facilitate adjustable, the features such as level and smooth hydraulic oil runner.At present, on the power station of China's (Three Gorges, Peng River, Chongqing, Jinghong In Yunnan Province etc.) and (U.S., Brazil etc.) all over the world, FC series of products are all widely used.
As shown in Figure 1, water turbine control valve comprises main valve body 1, the valve pocket 2 be arranged in main valve body, and is arranged on the spool 3 in valve pocket 2, the control end 4 being separately positioned on main valve body two ends and constant voltage end 5.Wherein, main valve body 1 and the fit clearance of valve pocket 2, spool 3, play a decisive role to the reliability of this control valve.As gap is too small, then spool is easily in use because of the heat that motion produces, and makes gap smaller, occurs the situation that spool is killed.As excesssive gap, leakage rate can be caused again large, in the case, need to increase fuel delivery, cause the increase of operating cost.The covering length of spool and the relative position of valve pocket both sides H nibs and circular hole require also higher, and hide apart from excessive, the response time is then longer, and the sensitivity of reaction declines.Otherwise oilhole hides less or can not hide completely, to have an impact service life to parts and maybe can not meet job requirement.
Summary of the invention
The object of this invention is to provide a kind of processing method of water turbine control valve, meet main valve body and valve pocket, spool coordinate requirement, promote the lifting of relevant processing manufacturing industry technique.
In order to realize above object, the present invention is achieved by the following technical solutions:
A processing method for water turbine control valve, is characterized in, the method includes the steps of:
Step 1, processing main valve body;
Step 2, processing valve pocket;
The inside and outside circle of step 2.1 roughing valve sleeve body, after roughing, carries out de-stress process, eliminates the residual stress after valve sleeve body roughing;
Step 2.2, on valve sleeve body, process mesopore, passed from mesopore by molybdenum filament, wire cutting machine tool pulls molybdenum filament cutting processing to go out a H nibs and the 2nd H nibs;
When step 2.3, cutting on line lathe being processed a H nibs and the 2nd H nibs, cutting on line platen is laid a pair V-type isometry block, with valve sleeve body excircle orientation, proofreads a pair V-type isometry block two point tolerance≤0.01 with dial gauge;
Step 2.4, on lathe stationary positioned block, fix dial indicator holder on the table, when processing the one H nibs, dial gauge to be fixed on dial indicator holder and to proofread zero-bit, during processing the 2nd H nibs, checks zero-bit, if any error, then adjust lathe with calibrated bolck;
The circular hole of step 2.5, employing horizontal Machining centers processing valve sleeve body, locates respectively with valve sleeve body both ends of the surface, with lever meter check and correction respectively to first, second H nibs plane zero locatino, after skew, and processing circular hole;
The method of step 2.6, employing Hole honing, removes the burr of circular hole and valve sleeve body endoporus intersection
Step 3, processing spool.
Described step 1 comprises following sub-step:
Step 1.1, roughing go out main valve body body;
Step 1.2, respectively from main valve body body two ends processing valve opening;
Step 1.3, main valve body body surfaces externally and internally to be polished.
Described step 3 comprises following sub-step:
Step 3.1, numerically controlled lathe are rough turn to insert body, and insert body cylindrical places surplus;
Step 3.2, carry out 1 × 45 ° of chamfering in the both sides in a pair omoplate face respectively, after heat treatment, remove the surplus of putting with Stupalox more;
Step 3.3 numerically controlled lathe is to insert body cylindrical and axial direction part fine finishining.
The present invention compared with prior art, has the following advantages:
The present invention, owing to processing the valve opening of main valve body respectively from two ends processing, solves the problem of valve opening linearity.
The present invention completes due to the inside and outside circle and both ends of the surface clamped one time processing valve pocket, ensures the concentricity of inside and outside circle and the perpendicularity of inside and outside circle and both ends of the surface.
The present invention, owing to adopting the method for Hole honing, effectively can remove the burr of circular hole and endoporus intersection, ensure that the chamfering being less than 0.025, and improve operating efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of water turbine control valve of the present invention;
Fig. 2 is structure and the scale diagrams of main valve body of the present invention;
Fig. 3 is the structural representation of valve pocket of the present invention;
Fig. 4 is the structural representation that the present invention processes valve pocket;
Fig. 5 is the structural representation that the present invention processes valve pocket;
Fig. 6 is the structural representation that the present invention locates two H nibs of valve pocket;
Fig. 7 is the structural representation of spool 3 of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
A processing method for water turbine control valve, the method includes the steps of:
Step 1, processing main valve body 1, the hole size that main valve body coordinates with valve pocket is Φ 292 (+0.050/+0.025) mm, forms by four sections, and the length in hole is 501mm;
Step 1.1, roughing go out main valve body body 10;
Step 1.2, adopt high-precision horizontal Machining centers turn round lathe respectively from main valve body body 10 two ends processing valve opening 11, first process two valve openings 11 in left side for the first time, then process two valve openings 11 on right side, this machine tool rotary positioning precision is 1/1000 °, SIN0.001 × L/2=0.004;
Step 1.3, main valve body body 10 surfaces externally and internally to be polished.
Step 2, processing valve pocket 2, valve pocket 2 is ironcasting, is typical thin-walled parts, and cylindrical is Φ 292-0.012mm, and endoporus is Φ 254+0.025mm, and wall thickness is 19mm.Coordinate cylindrical to be divided into four sections, inside and outside circle fineness is Ra0.8, circumferentially both sides distribution the one H nibs 27, the 2nd H nibs 28 and some circular hole 23(different situations, and hole count is different).The length tolerance of both sides the one H nibs 27, the 2nd H nibs 28 is 0.05mm, H nibs spacing 0.05mm, and the dimensional tolerance of circular hole 23 is 0.02mm, and circular hole 23 is 0.05mm with the distance tolerance of H nibs.(see Fig. 2);
The inside and outside circle of step 2.1 roughing valve sleeve body 20, after roughing, carry out de-stress process, eliminate the residual stress after valve sleeve body 20 roughing, adopt the turning milling center processing of DMJ, with car generation mill (machining accuracy 0.01, cylindricity 0.005, fineness Ra0.85), inside and outside circle and both ends of the surface clamped one time complete, and ensure the perpendicularity of the concentricity of inside and outside circle, inside and outside circle and both ends of the surface;
Step 2.2, on valve sleeve body 20, process mesopore 21, passed by molybdenum filament 22 from mesopore 21, wire cutting machine tool pulls molybdenum filament 22 cutting processing to go out a H nibs 27 and the 2nd H nibs 28(see Fig. 3,4);
When step 2.3, cutting on line lathe being processed a H nibs 27 and the 2nd H nibs 28, cutting on line platen is laid a pair V-type isometry block 24, with valve sleeve body 20 excircle orientation, a pair V-type isometry block two point tolerance≤0.01 is proofreaded with dial gauge 25, with valve pocket excircle orientation, ensure the perpendicularity (see Fig. 3,5) of a H nibs 27 and the 2nd H nibs 28 and inside and outside circle preferably;
Step 2.4, on lathe stationary positioned block 26, fix dial indicator holder on the table, when processing the one H nibs 27, dial gauge 25 to be fixed on dial indicator holder and to proofread zero-bit, when processing the 2nd H nibs 28, be that 229mm calibrated bolck 29 checks zero-bit by length, if any error, then adjust lathe (see Fig. 6);
The circular hole 23 of step 2.5, employing horizontal Machining centers processing valve sleeve body 20, locates respectively with valve sleeve body both ends of the surface, with lever meter check and correction respectively to a H nibs 27, the 2nd H nibs 28 plane zero locatino, after skew, and processing circular hole 23;
The method of step 2.6, employing Hole honing, removes the burr of circular hole 23 and valve sleeve body 20 endoporus intersection.
Step 3, processing spool 3(are see Fig. 7);
Step 3.1, numerically controlled lathe are rough turn to insert body 30, and insert body 30 cylindrical places surplus;
Step 3.2, carry out 1 × 45 ° of chamfering in the both sides in a pair omoplate face 31 respectively, after heat treatment, remove the surplus of putting with Stupalox more;
Step 3.3 numerically controlled lathe is to insert body 30 cylindrical and axial direction part fine finishining.
Finally according to the structural representation of Fig. 1, control end 4 and constant voltage end 5 are installed.
In sum, the processing method of a kind of water turbine control valve of the present invention, meet main valve body and valve pocket, spool coordinate requirement, promote the lifting of relevant processing manufacturing industry technique.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.