A kind of processing method of engine valve shaping CBN emery wheels
Technical field
The present invention relates to the process technology of super-hard abrasive tool in grinding materials and grinding tool industry, and in particular to a kind of engine valve shaping
The processing method of CBN emery wheels.
Background technology
Valve is the important component of engine, the reliability and effect that the processing precision direct influence of valve works to engine
Rate.Currently used processing method has:Numerical control smart car method and shaping grinding method.Form grinding emery wheel include common corundum emery wheel and
New electroplating CBN emery wheel.
Electroplating CBN emery wheel is molded using cubic boron nitride as abrasive material, this abrasive material is the superhard material that hardness is only second to diamond,
It not only has many good characteristics of diamond, and has higher heat endurance and to iron group metal and its chemistry of alloy
Inertia, fatigue strength of the workpiece to be machined in grinding process can be effectively reduced, increase workpiece service life, and self-sharpening is good, mill
Cut sharp, be not easily blocked and burn workpiece, is adapted to high-speed grinding.CBN abrasive materials by galvanoplastic be fixedly arranged at by Precision Machining into
In the steel matrix of type, hard grinding can be carried out to steel part or ironcasting, and can be very good to keep form accuracy.Due to
Upper characteristic, using key positions such as shaping electroplating CBN wheel grinding valve collet groove ﹑ outer cone faces ends, can effectively it protect
The precision and uniformity of valve are demonstrate,proved, greatly improves processing efficiency, is had a clear superiority compared to conventional method and bright prospects.
The content of the invention
It is an object of the invention to provide a kind of adding for the engine valve that stability is good, grinding accuracy is high shaping CBN emery wheels
Work method.
Technical scheme:A kind of processing method of engine valve shaping CBN emery wheels, comprises the following steps:
A, grinding wheel base body prepares:Using metal forging part, embryo material roughing, quenching and tempering hardness is HRC28~32, Ageing Treatment
The defects of ensuring flawless and sand holes by flaw detection afterwards;
B, grinding wheel base body semifinishing:Counterbore is uniformly processed in both ends of the surface after the smart car of forge piece half, grinding machine processes
Both ends of the surface and endoporus, it is stand-by;
C, grinding wheel base body finishes:Grinding wheel base body after grinding is fastened on the fixture of high precision digital control lathe,
Effect hole bounce≤0.002mm, end face run-out≤0.005mm, then fine turning outer circle profile, each smart car of both ends of the surface goes out >=3mm
Step, and excircle configuration clamped one time are machined, and matrix excircle configuration and form and position tolerance are detected with three coordinate detectors;
D, coating:It is using plating metal principle by deposition of the metallic bond on grinding wheel base body surface, CBN abrasive materials is equal
It is even to be fixedly arranged on grinding wheel base body excircle configuration;
E, emery wheel clamping correction on numerically controlled lathe after electroplating, high rotating speed is ground profiling sample block, with three coordinate detectors
To detect sample block profile, then need to repair emery wheel local polishing if any deviation;
F, the emery wheel trimmed does dynamic balancing and reaches G0.4 standards, gets product.
Further, the step a medium plain emery wheels matrix is prepared using materials such as 45 Gang ﹑ 40Cr ﹑ 35CrMo.
Further, the step b medium plain emery wheel both ends of the surface depth of parallelism requirement≤0.005mm, roughness Ra value≤0.8 μm,
Circularity requirement≤0.002mm of endoporus, roughness Ra value≤0.8 μm.
Further, finishing wheel matrix profile tolerance requirement≤0.005mm, rough grinding wheel matrix profile in the step c
Spend requirement≤0.02mm.
Further, metallic bond uses nickel alloy in the step d.
Further, the embedment rate of CBN particles is controlled between 30~50% in the step d.
Further, the step e medium plain emery wheels are ground profiling sample block with > 3000r/min speed.
The present invention is also provided a kind of engine valve prepared using the above method and is molded CBN emery wheels, including emery wheel body,
The emery wheel body outer circumferential end face is provided with the first mill with valve discone antenna surface, air valve cervix and engine valve stem form fit
Face, described this body side surface of emery wheel are provided with the second flour milling that can be ground valve retainer end.
Preferably, described this body side surface of emery wheel is additionally provided with the bevel grinding face that can be ground valve retainer end-beveling.
As further preferred, described this body side surface of emery wheel is provided with annular groove, and the emery wheel body side surface circumference is provided with
Connect the straight trough of annular groove.
As further preferred, this body side surface of emery wheel outer rim sets oblique angle X, and the oblique angle X angles are 3~10 °.
Beneficial effects of the present invention:
(1) for CBN as a kind of superhard material, the characteristic of itself causes the loss very little in grinding process, can keep sharp
Property, it need not repair in process, processing efficiency and service life are enhanced about more than once than profile milling cutter wheel, compare common corundum
Emery wheel is improved more than twice, and the deviation of initial workpiece and last part is can be controlled within 0.005mm during batch machining.
(2) steel matrix that CBN emery wheels use high intensity is molded, maximum linear velocity is up to 150m/s, plating metal bonding agent
It is also very firm to the hold of abrasive material, it is adapted to high-speed grinding, rotating speed is higher, and grinding quality and efficiency are higher, the surface of workpiece
Roughness Ra value can reach 0.4 μm, and in the case of grinding amount L T.LT.LT 1mm, plain wheel takes around more than 15s, and electroforming
CBN emery wheels only need 2~5s.
(3) present invention can be existed by high precision digital control lathe come the excircle configuration of processing grinding wheel matrix with convenience and high-efficiency
Changed between different molded line profiles, significantly reduce production cost, shorten the production cycle.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, embodiment will be described below
In the required accompanying drawing used be briefly described, it should be apparent that, drawings in the following description be only the present invention wherein
One embodiment, for those of ordinary skill in the art, without having to pay creative labor, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is partial structural diagram of the present invention;
Fig. 2 is the structural representation of invention wheel grinding valve part;
Fig. 3 is the structural representation of invention wheel grinding valve part;
In figure:1- emery wheels body, 2- straight troughs, 3- annular grooves, 4- bevel grindings face, 51- valves discone antenna surface, 52- air valve cervixes, 53-
Engine valve stem, 54- valve retainers end, 55- valve retainer end-bevelings.
Embodiment
To make those skilled in the art understand the methods and techniques effect of the present invention in detail, entered below with specific embodiment
One step introduces application and the technique effect of the present invention.
Embodiment 1
A kind of processing method of engine valve shaping CBN emery wheels, comprises the following steps:
A, grinding wheel base body prepares:Grinding wheel base body uses 45 steel forging forging pieces, and quenching and tempering hardness is HRC28~32, after Ageing Treatment
The defects of ensuring flawless and sand holes by flaw detection;
B, grinding wheel base body semifinishing:According to practical condition after the smart car of forge piece half, uniformly processed in both ends of the surface
Going out through hole, grinding machine processes both ends of the surface and endoporus, stand-by, emery wheel both ends of the surface depth of parallelism requirement≤0.005mm, roughness Ra value≤
0.8 μm, circularity requirement≤0.002mm of endoporus, roughness Ra value≤0.8 μm;
C, grinding wheel base body finishes:Grinding wheel base body after grinding is fastened on the fixture of high precision digital control lathe,
Effect hole bounce≤0.002mm, end face run-out≤0.005mm, then fine turning outer circle profile, finishing wheel matrix profile tolerance require
≤ 0.005mm, rough grinding wheel matrix profile tolerance requirement≤0.02mm, each smart car of both ends of the surface goes out >=3mm step, and excircle configuration
Clamped one time is machined, and matrix excircle configuration and form and position tolerance are detected with three coordinate detectors;
D, coating:It is using plating metal principle by deposition of the metallic bond on grinding wheel base body surface, CBN abrasive materials is equal
Even to be fixedly arranged on grinding wheel base body excircle configuration, the embedment rate of CBN particles is controlled between 35~40%;
E, emery wheel clamping correction on numerically controlled lathe after electroplating, is ground profiling sample block with > 3000r/min speed, uses
Three coordinate detectors detect sample block profile, then need if any deviation to repair emery wheel local polishing;
F, the emery wheel trimmed does dynamic balancing and reaches G0.4 standards, gets product.
Embodiment 2
A kind of processing method of engine valve shaping CBN emery wheels, comprises the following steps:
A, grinding wheel base body prepares:Grinding wheel base body uses 40Cr forge pieces, and quenching and tempering hardness is HRC28~32, after Ageing Treatment
The defects of ensuring flawless and sand holes by flaw detection;
B, grinding wheel base body semifinishing:According to practical condition after the smart car of forge piece half, uniformly processed in both ends of the surface
Going out through hole, grinding machine processes both ends of the surface and endoporus, stand-by, emery wheel both ends of the surface depth of parallelism requirement≤0.005mm, roughness Ra value≤
0.8 μm, circularity requirement≤0.002mm of endoporus, roughness Ra value≤0.8 μm;
C, grinding wheel base body finishes:Grinding wheel base body after grinding is fastened on the fixture of high precision digital control lathe,
Effect hole bounce≤0.002mm, end face run-out≤0.005mm, then fine turning outer circle profile, finishing wheel matrix profile tolerance require
≤ 0.005mm, rough grinding wheel matrix profile tolerance requirement≤0.02mm, each smart car of both ends of the surface goes out >=3mm step, and excircle configuration
Clamped one time is machined, and matrix excircle configuration and form and position tolerance are detected with three coordinate detectors;
D, coating:It is using plating metal principle by deposition of the metallic bond on grinding wheel base body surface, CBN abrasive materials is equal
Even to be fixedly arranged on grinding wheel base body excircle configuration, the embedment rate of CBN particles is controlled between 45~50%;
E, emery wheel clamping correction on numerically controlled lathe after electroplating, is ground profiling sample block with > 3000r/min speed, uses
Three coordinate detectors detect sample block profile, then need if any deviation to repair emery wheel local polishing;
F, the emery wheel trimmed does dynamic balancing and reaches G0.4 standards, gets product.
Embodiment 3
A kind of processing method of engine valve shaping CBN emery wheels, comprises the following steps:
A, grinding wheel base body prepares:Grinding wheel base body uses 35CrMo forge pieces, and quenching and tempering hardness is HRC28~32, Ageing Treatment
The defects of ensuring flawless and sand holes by flaw detection afterwards;
B, grinding wheel base body semifinishing:According to practical condition after the smart car of forge piece half, uniformly processed in both ends of the surface
Going out through hole, grinding machine processes both ends of the surface and endoporus, stand-by, emery wheel both ends of the surface depth of parallelism requirement≤0.005mm, roughness Ra value≤
0.8 μm, circularity requirement≤0.002mm of endoporus, roughness Ra value≤0.8 μm;
C, grinding wheel base body finishes:Grinding wheel base body after grinding is fastened on the fixture of high precision digital control lathe,
Effect hole bounce≤0.002mm, end face run-out≤0.005mm, then fine turning outer circle profile, finishing wheel matrix profile tolerance require
≤ 0.005mm, rough grinding wheel matrix profile tolerance requirement≤each smart car of 0.02mm both ends of the surface goes out >=3mm step, and excircle configuration
Clamped one time is machined, and matrix excircle configuration and form and position tolerance are detected with three coordinate detectors;
D, coating:It is using plating metal principle by deposition of the metallic bond on grinding wheel base body surface, CBN abrasive materials is equal
Even to be fixedly arranged on grinding wheel base body excircle configuration, the embedment rate of CBN particles is controlled between 40~45%;
E, emery wheel clamping correction on numerically controlled lathe after electroplating, is ground profiling sample block with > 3000r/min speed, uses
Three coordinate detectors detect sample block profile, then need if any deviation to repair emery wheel local polishing;
F, the emery wheel trimmed does dynamic balancing and reaches G0.4 standards, gets product.
Embodiment 4
A kind of engine valve prepared according to the methods described of embodiment 1~3 is molded CBN emery wheels, as shown in Figures 1 to 3, bag
Emery wheel body 1 is included, the outer circumferential end face of emery wheel body 1 is provided with and valve discone antenna surface 51, air valve cervix 52 and engine valve stem
First flour milling of 53 form fits, the side of emery wheel body 1 are provided with the second flour milling that can be ground valve retainer end 54.
As the preferred scheme of the present embodiment, the side of emery wheel body 1, which is also provided with that valve retainer end can be ground, falls
The bevel grinding face 4 at angle 55.
As the further preferred scheme of the present embodiment, the side of emery wheel body 1 can set up annular groove 3, the emery wheel body 1
Side surface circumference can set up the straight trough 2 of connection annular groove 3.The depth and width of the annular groove are 2~4mm;The depth of the straight trough
For 2~4mm, width is 4~8mm.The design of annular groove and straight trough, a large amount of chips can be effectively discharged, substantially reduce wheel topography
Probability, improve wheel life, grinding fluid can be conveyed in place again, really play a part of the sliding ﹑ coolings of profit, avoid valve
Burn, ensure that grinding quality.
As the further preferred scheme of the present embodiment, the also settable oblique angle X of the side outer rim of emery wheel body 1.Valve
The diameter of disk end is generally 30~80mm of ∮, because valve and emery wheel make gyration, the side grinding area ring width of emery wheel simultaneously
Its radius size must be more than, could be by cross grinding in place.Grinding process is that longitudinal primary feed is completed, and grinding wheel side face is easy
Hit by valve retainer end, cause abrasive material to come off, due to abrasive material and valve retainer end bump contact, grinding fluid is difficult infiltration
To grinding position, situations such as easily causing blocking and the workpiece burn of emery wheel, side peripheral edge portion processing of the present embodiment in emery wheel
Go out an X oblique angles transition, oblique angle with grinding wheel cylindrical circular sliding slopes, solves the problems, such as that emery wheel is knocked so that grinding process again
Smooth-going is carried out.
The technical scheme provided above the embodiment of the present invention is described in detail, specific case used herein
The principle and embodiment of the embodiment of the present invention are set forth, the explanation of above example is only applicable to help and understands this
The principle of inventive embodiments;Meanwhile for those of ordinary skill in the art, according to the embodiment of the present invention, in specific embodiment party
There will be changes in formula and application, in summary, this specification content should not be construed as limiting the invention.