CN105843283A - Camshaft grinding processing thermostatic control device and method - Google Patents

Abstract

The invention provides a camshaft grinding processing thermostatic control device and method. The device comprises a power measuring module used for measuring power of an electric motor in real time and outputting the power, and a thermostatic control module used for receiving the power output by the power measuring module and calculating maximum temperature of a surface of a contact area of a grinding wheel and a camshaft according to the power and a preset thermostatic control model, wherein the thermostatic control module is also used for comparing the maximum temperature and a preset temperature threshold; if that the maximum temperature is higher than or equal to the preset temperature value is determined, the electric motor is controlled to lower camshaft rotation speed, and camshaft cutting depth of the grinding wheel is reduced. The device provided in the invention can regulate processing temperature in real time, temperature across a surface of the camshaft is enabled to be set at allowable maximum temperature, the camshaft can be prevented from grinding burn, processing efficiency can be improved, camshaft quality can consequently be improved, and service life of the camshaft can be prolonged.

Description

The thermostatically-controlled equipment of Camshaft Grinding processing and method

Technical field

The invention belongs to part processing technique field, process particularly to a kind of Camshaft Grinding Thermostatically-controlled equipment and method.

Background technology

Camshaft is part important in automobile engine air distributing device, controls automobile engine Valve opening and closed action.Owing to cam contour belongs to special-shaped curved, thus processing technique and Scheme is the most complex, especially the crudy of cam face, directly determines camshaft and exists Whether engine charge and exhaust work circulation can produce the impact between valve and cam and shake Dynamic, thus affect automobile engine stationarity at work.And the quality of camshaft quality is straight Connect the quality depending on camshaft grinding quality.

The profile of cam is extremely complex, and requirement on machining accuracy is high, and difficulty of processing is big, the course of processing Control difficulty big.Cam ground at present is largely dependent upon experience and the intuition of operative employee. Although in the case of known lathe dynamic constrained and cam contour, it is provided that parameter process velocity Computer program is implicitly present in, but, even if there being the support of computer program still to need in a large number Repeat grinding experiment to adjust, and these adjustment also depend on veteran technical staff.This Outward, when cam generation grinding burn phenomenon, some manufacturing firm selects to reduce emery wheel single and enters Giving amount, the most some other producer then selects to reduce process velocity.This although " only according to sensation " The change carried out can eliminate grinding machine burn phenomenon to a certain extent, but can have a strong impact on and add work efficiency Rate.Above-mentioned this it is processed method based on workman's experience, there is feedback not in time, processing Efficiency is low, the high defect of waste of material rate, and be unfavorable for raising batch Camshaft Production adds working medium Amount stability and working (machining) efficiency.

Summary of the invention

The present invention be in order to solve existing camshaft processing method only with operator experience and Intuition is processed and camshaft is easily the occurred problem such as grinding burn, working (machining) efficiency be relatively low.

In order to achieve the above object, the invention provides the constant temperature control of a kind of Camshaft Grinding processing Method and device processed.

First aspect, the invention provides the thermostatically-controlled equipment of Camshaft Grinding processing, including:

Power measurement module, for the power of measurement motor in real time, and exports described power, Wherein, described motor is the motor of the emery wheel electro spindle that camshaft carries out grinding；

Thermostatic control module, for receiving the power of described power measurement module output, and according to Described power and default thermostatic control model calculate current emery wheel and surface, camshaft contact area Maximum temperature；

Described thermostatic control module, is additionally operable to described maximum temperature and default temperature threshold ratio Relatively, if judging to know that described maximum temperature greater than or equal to described default temperature threshold, is then controlled Make described motor reduce camshaft speed or reduce the emery wheel cutting-in to camshaft.

Preferably,

Described thermostatic control module, if being additionally operable to judge to know that described maximum temperature is less than described pre- If temperature threshold, then control described motor and improve camshaft speed, and increase emery wheel to cam The cutting-in of axle.

Preferably,

If described thermostatic control module judges described power more than the power threshold needing finishing, Control described motor to quit work, and send finishing or change the warning instruction of emery wheel.

Preferably,

Described default thermostatic control model is realized by following formula, particularly as follows:

${\mathrm{\θ}}_m=\frac{\mathrm{\γ}\·P}{bc\mathrm{\ρ}}\sqrt{L_i^3/v_i}$

Wherein, θ_mMaximum temperature for current emery wheel Yu surface, camshaft contact area；γ is constant temperature control Simulation temperature correction coefficient；P is the power that described motor is current；B is the width of camshaft；ρ Density of material for camshaft；C is the specific heat capacity of camshaft；I is the angle of camshaft；L_iFor often The contact arc length that i degree camshaft is corresponding；v_iInstantaneous linear velocity for every i degree camshaft.

Preferably,

The contact arc length L that described every i degree camshaft is corresponding_iRealized by following formula, particularly as follows:

$L_i=\sqrt{\frac{d_s\·d_i\·a_e}{d_s+d_i}}$

Wherein, i is the angle of camshaft；d_sDiameter for emery wheel；d_iConvex corresponding to every i degree The equivalent diameter of wheel shaft；a_eFor the emery wheel cutting-in to camshaft；

Instantaneous linear velocity v of described every i degree camshaft_iRealized by following formula, particularly as follows:

$v_i=\frac{n_i}{60}\·\mathrm{\π}\·d_i$

Wherein, i is the angle of camshaft；d_iThe equivalent diameter of the camshaft corresponding to every i degree； n_iTransient speed for every i degree camshaft.

Second aspect, the invention provides the constant-temperature control method of Camshaft Grinding processing, including:

Power measurement module measures the power of motor in real time, and is exported by described power, wherein, Described motor carries out the motor of the emery wheel electro spindle of grinding to camshaft；

Thermostatic control module receives the power of described power measurement module output, and according to described merit Rate and default thermostatic control model calculate the highest of current emery wheel and surface, camshaft contact area Temperature；

Described maximum temperature is compared, if sentencing by described thermostatic control module with the temperature threshold preset Break and know that described maximum temperature greater than or equal to described default temperature threshold, then controls described electricity Machine reduces camshaft speed or reduces the emery wheel cutting-in to camshaft.

Preferably, described method also includes:

If described thermostatic control module judges to know that described maximum temperature is less than described default temperature Threshold value, then control described motor and reduce camshaft speed, and increase the emery wheel cutting-in to camshaft.

Preferably, described method also includes:

If described thermostatic control module judges described power more than the power threshold needing finishing, Control described motor to quit work, and send finishing or change the warning instruction of emery wheel.

Preferably, described default thermostatic control model is realized by following formula, particularly as follows:

${\mathrm{\θ}}_m=\frac{\mathrm{\γ}\·P}{bc\mathrm{\ρ}}\sqrt{L_i^3/v_i}$

Wherein, θ_mMaximum temperature for current emery wheel Yu surface, camshaft contact area；γ is constant temperature control Simulation temperature correction coefficient；P is the power that described motor is current；B is the width of camshaft；ρ Density of material for camshaft；C is the specific heat capacity of camshaft；I is the angle of camshaft；L_iFor often The contact arc length that i degree camshaft is corresponding；v_iInstantaneous linear velocity for every i degree camshaft.

Preferably, the contact arc length L that described every i degree camshaft is corresponding_iRealized by following formula, Particularly as follows:

$L_i=\sqrt{\frac{d_s\·d_i\·a_e}{d_s+d_i}}$

Wherein, i is the angle of camshaft；d_sDiameter for emery wheel；d_iConvex corresponding to every i degree The equivalent diameter of wheel shaft；a_eFor the emery wheel cutting-in to camshaft；

Instantaneous linear velocity v of described every i degree camshaft_iRealized by following formula, particularly as follows:

$v_i=\frac{n_i}{60}\·\mathrm{\π}\·d_i$

Wherein, i is the angle of camshaft；d_iThe equivalent diameter of the camshaft corresponding to every i degree； n_iTransient speed for every i degree camshaft.

In the thermostatically-controlled equipment of the Camshaft Grinding processing that the present invention provides, power measurement module The power of motor is measured in real time and result is exported to thermostatic control module, thermostatic control Module according to the maximum temperature of power calculation current camshaft contact surface and is made to compare with temperature threshold Relatively, and according to comparative result regulation regulation processing temperature in real time make camshaft surface temperature everywhere equal It is in maximum permissible temperature value, Camshaft Grinding so can not only be avoided to burn, moreover it is possible to improve Working (machining) efficiency, thus improve the quality of camshaft, extend the service life of camshaft.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below In describing embodiment, the required accompanying drawing used is briefly described, it should be apparent that under, Accompanying drawing in the description of face is only some examples of the present invention, for those of ordinary skill in the art From the point of view of, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings Accompanying drawing.

Fig. 1 is the embodiment knot of the thermostatically-controlled equipment of the Camshaft Grinding processing that the present invention provides Structure schematic diagram；

Fig. 2 is the Triangle-Profile heat source model schematic diagram that the present invention provides；

Fig. 3 is the geometrical relationship schematic diagram of the camshaft incision mill that the present invention provides；

Fig. 4 is cam lift Vickers hardness comparison diagram after the grinding that the present invention provides；

Fig. 5 is cam lift surface roughness comparison diagram after the grinding that the present invention provides；

Fig. 6 is the embodiment stream of the constant-temperature control method of the Camshaft Grinding processing that the present invention provides Cheng Tu.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical side in the embodiment of the present invention Case is clearly and completely described, it is clear that described embodiment is only the present invention one Divide embodiment rather than whole embodiments.Based on the embodiment in the present invention, this area is general The every other embodiment that logical technology people is obtained under not making creative work premise, all Belong to the scope of protection of the invention.

First aspect, the invention provides the thermostatically-controlled equipment of a kind of Camshaft Grinding processing Embodiment, as it is shown in figure 1, include:

Power measurement module 101, for the power of measurement motor in real time, and exports power, its In, motor is that the camshaft driven carries out rotating and drive emery wheel that camshaft is carried out the electricity of grinding Machine；

Thermostatic control module 102, for receiving the power of power measurement module output, and according to merit Rate and default thermostatic control model calculate the highest of current emery wheel and surface, camshaft contact area Temperature；

Thermostatic control module 102, is additionally operable to compare maximum temperature with the temperature threshold preset, if Judge to know that maximum temperature is greater than or equal to the temperature threshold preset, then control motor and reduce cam Axle rotating speed or the reduction emery wheel cutting-in to camshaft.

In the thermostatically-controlled equipment of the Camshaft Grinding processing that the embodiment of the present invention provides, power is surveyed The power of motor is measured in output to thermostatic control module, thermostatic control by amount module in real time Module according to the maximum temperature of power calculation current camshaft contact surface and is made to compare with temperature threshold Relatively, and according to comparative result regulation regulation processing temperature in real time make camshaft surface temperature everywhere equal It is in maximum permissible temperature value, Camshaft Grinding so can not only be avoided to burn, moreover it is possible to improve Working (machining) efficiency, thus improve the quality of camshaft, extend the service life of camshaft.

In the specific implementation, thermostatic control module 102, if being additionally operable to judge to know the described highest temperature Degree less than described default temperature threshold, then controls described motor and improves camshaft speed or increasing The big emery wheel cutting-in to camshaft.It is to say, when the temperature on camshaft surface is also not up to High allow temperature value (namely temperature threshold) time, can by improve camshaft speed or Cutting-in thus improve working (machining) efficiency.

In the specific implementation, in order to enable after abrasion occurs in emery wheel, carry out in time repairing or more Change emery wheel, thermostatic control module, if being additionally operable to judge to know that described power exceedes needs finishing During power threshold, control described motor and quit work, and send finishing or change the report of emery wheel Alert instruction.After emery wheel is repaired or is changed after receiving such prompting by operator It is further continued for processing, thus avoids excessively repairing the waste caused and finishing or changing not in time The problem that the crudy caused declines.

In the specific implementation, the thermostatic control model preset here can be real in several ways Execute, below one of which implementation be specifically described:

The thermostatic control model preset can pass through formula (1) and realize, particularly as follows:

${\mathrm{\θ}}_m=\frac{\mathrm{\γ}\·P}{bc\mathrm{\ρ}}\sqrt{L_i^3/v_i}---\left(1\right)$

In formula (1), θ_mMaximum temperature for current emery wheel Yu surface, camshaft contact area；γ is permanent Temperature control model temperature correction factor；P is the power that described motor is current；B is the width of camshaft Degree；ρ is the density of material of camshaft；C is the specific heat capacity of camshaft；I is the angle of camshaft； L_iFor the contact arc length that every i degree camshaft is corresponding；v_iInstantaneous linear velocity for every i degree camshaft.

Wherein, thermostatic control model temperature correction factor γ here is to obtain according to experiment measured data Arrive；Specific heat capacity c of the width b of camshaft, the density of material ρ of camshaft and camshaft is The self attributes of camshaft, can be manually entered into thermostatic control module by operator before processing In.

Below the concrete derivation of the thermostatic control model that it is preset is described in detail.

The Temperature Distribution of cam face meets Triangle-Profile heat source model as shown in Figure 2.Such as figure Shown in 2, along grinding area, chip thickness is uneven, about has maximum in front, grinding area Value, and at afterbody close to 0, therefore a triangle heat flux distribution in grinding area is more reasonably. For triangle heat distribution on BC it is assumed that at the instantaneous d of time τ_τi(τ_e≤τ_i≤τ₀), from What BC launched crosses the transient heat flow that D (x, 0) puts isFrom this time to τ₀ Time interval be equal to: τ=τ₀-τ_i。

The temperature of the BC near surface D point of one big solid of semo-infinite rises what high energy equation was similar to Method calculates, specifically as shown in formula (2):

$d\mathrm{\θ}=\frac{\mathrm{\γ}\·P}{bc\mathrm{\ρ}}{\∫}_{{\mathrm{\τ}}_e}^{{\mathrm{\τ}}_0}\frac{1-\frac{{\mathrm{\τ}}_i-{\mathrm{\τ}}_e}{{\mathrm{\τ}}_0}}{{\mathrm{\τ}}^{1/2}}{e}^{-\frac{z^2}{4{\mathrm{\τ}}_i}}{L}_i{\mathrm{d\τ}}_i---\left(2\right)$

Above formula is solved by some integrations:

Temperature rise on surface, contact area is Z=0.

Make τ_e=0, againWork as τ₀=2 τ_iTime, i.e.Place, obtains current emery wheel with convex The maximum temperature on surface, wheel shaft contact area is shown in formula (1).

In the specific implementation, the contact arc length L that the every i degree camshaft in formula (1) is corresponding_iCan basis The geometrical relationship schematic diagram of the camshaft incision mill shown in Fig. 3 obtains, particularly as follows:

$L_i=\sqrt{\frac{d_s\·d_i\·a_e}{d_s+d_i}}---\left(3\right)$

Wherein, i is the angle of camshaft；d_sDiameter for emery wheel；d_iConvex corresponding to every i degree The equivalent diameter of wheel shaft；a_eFor the emery wheel cutting-in to camshaft.

Instantaneous linear velocity v of the every i degree camshaft in formula (1)_iGeneral can convex according to shown in Fig. 3 The geometrical relationship schematic diagram of wheel shaft incision mill obtains, particularly as follows:

$v_i=\frac{n_i}{60}\·\mathrm{\π}\·d_i---\left(4\right)$

Wherein, i is the angle of camshaft；d_iThe equivalent diameter of the camshaft corresponding to every i degree； n_iTransient speed for every i degree camshaft.

It should be noted that illustration in above-described embodiment is only to facilitate more preferably geographical Solve the method that the embodiment of the present invention provides, the concrete restriction to the present invention can not be constituted.On and Will not influence each other between each preferred implementation stated, between each preferred implementation Scheme obtained by combination in any all should fall into protection scope of the present invention.

Additionally, for the superiority embodying the present invention, below special the embodiment of the present invention is provided Processing unit (plant) contrasts with existing processing unit (plant).Specifically, 16 cams are taken it is impartial Be divided into A, B two groups.A group uses thermostatic control to be processed, and B group is rule of thumb processed. Draw following experimental result, as shown in Figure 4,5: the experiment of A group is saved nearly than B group experimental period 1/3rd；A group experiment cam is not burnt, and B group experiment cam burn reaches 75%；A group is real Test cam face hardness meansigma methods and test the cam face high 74.713HV of hardness meansigma methods than B group；A Group experiment cam face roughness average is lower than B group experiment cam face roughness average 0.0917μm.It can be seen that the processing unit (plant) that the present invention provides can be burnt preventing camshaft On the premise of be effectively improved working (machining) efficiency and crudy.

Second aspect, the invention provides the constant-temperature control method of a kind of Camshaft Grinding processing Embodiment, as shown in Figure 6, including:

S601, power measurement module measure the power of motor in real time, and are exported by described power, Wherein, described motor is the motor of the emery wheel electro spindle that camshaft carries out grinding；

The power of S602, thermostatic control module reception described power measurement module output, and according to Described power and default thermostatic control model calculate current emery wheel and surface, camshaft contact area Maximum temperature；

Described maximum temperature is compared by S603, described thermostatic control module with the temperature threshold preset, If judging to know that described maximum temperature greater than or equal to described default temperature threshold, then controls institute State motor reduce camshaft speed or reduce the emery wheel cutting-in to camshaft.

In the specific implementation, described method also includes:

If described thermostatic control module judges to know that described maximum temperature is less than described default temperature Threshold value, then control described motor and improve camshaft speed, or camshaft is cut by increase emery wheel Deeply.

In the specific implementation, described method also includes:

If described thermostatic control module judges described power more than the power threshold needing finishing, Control described motor to quit work, and send finishing or change the warning instruction of emery wheel.

In the specific implementation, described default thermostatic control model is realized by following formula, tool Body is:

${\mathrm{\θ}}_m=\frac{\mathrm{\γ}\·P}{bc\mathrm{\ρ}}\sqrt{L_i^3/v_i}$

Wherein, θ_mMaximum temperature for current emery wheel Yu surface, camshaft contact area；γ is constant temperature control Simulation temperature correction coefficient；P is the power that described motor is current；B is the width of camshaft；ρ Density of material for camshaft；C is the specific heat capacity of camshaft；I is the angle of camshaft；L_iFor often The contact arc length that i degree camshaft is corresponding；v_iInstantaneous linear velocity for every i degree camshaft.

In the specific implementation, the contact arc length L that described every i degree camshaft is corresponding_iIt is real by following formula Existing, particularly as follows:

$L_i=\sqrt{\frac{d_s\·d_i\·a_e}{d_s+d_i}}$

Wherein, i is the angle of camshaft；d_sDiameter for emery wheel；d_iConvex corresponding to every i degree The equivalent diameter of wheel shaft；a_eFor the emery wheel cutting-in to camshaft；

Instantaneous linear velocity v of described every i degree camshaft_iRealized by following formula, particularly as follows:

$v_i=\frac{n_i}{60}\·\mathrm{\π}\·d_i$

Wherein, i is the angle of camshaft；d_iThe equivalent diameter of the camshaft corresponding to every i degree； n_iTransient speed for every i degree camshaft.

Due to the most structure of thermostatically-controlled equipment to Camshaft Grinding processing And operation principle is described in detail, for saving length, no longer concrete to method at this Step repeats.

The present invention will be described rather than carries out the present invention to it should be noted above-described embodiment Limit, and those skilled in the art without departing from the scope of the appended claims may be used Design alternative embodiment.In the claims, any reference between bracket should not will be located in Symbol construction becomes limitations on claims.Word " comprises " not exclude the presence of and is not listed in right Element in requirement or step.Word "a" or "an" before being positioned at element is not excluded for There is multiple such element.The present invention can be by means of the hardware including some different elements And realize by means of properly programmed computer.If listing the unit right of equipment for drying In requirement, several in these devices can be specifically to be embodied by same hardware branch. Word first, second and third use do not indicate that any order.Can be by these words It is construed to title.

Last it is noted that above example is only in order to illustrate technical scheme, and Non-to its restriction；Although the present invention being described in detail with reference to previous embodiment, ability The those of ordinary skill in territory is it is understood that it still can be to the skill described in foregoing embodiments Art scheme is modified, or wherein portion of techniques feature is carried out equivalent；And these are repaiied Change or replace, not making the essence of appropriate technical solution depart from various embodiments of the present invention technical side The spirit and scope of case.

Claims (10)

1. the thermostatically-controlled equipment of a Camshaft Grinding processing, it is characterised in that including:

Power measurement module, for the power of measurement motor in real time, and exports described power, Wherein, described motor is the motor of the emery wheel electro spindle that camshaft carries out grinding；

Thermostatic control module, for receiving the power of described power measurement module output, and according to Described power and default thermostatic control model calculate current emery wheel and surface, camshaft contact area Maximum temperature；

Described thermostatic control module, is additionally operable to described maximum temperature and default temperature threshold ratio Relatively, if judging to know that described maximum temperature greater than or equal to described default temperature threshold, is then controlled Make described motor reduce camshaft speed or reduce the emery wheel cutting-in to camshaft.

2. device as claimed in claim 1, it is characterised in that

Described thermostatic control module, if being additionally operable to judge to know that described maximum temperature is less than described pre- If temperature threshold, then control described motor and improve camshaft speed, and increase emery wheel to cam The cutting-in of axle.

3. device as claimed in claim 1, it is characterised in that

Described thermostatic control module, if being additionally operable to judge to know described power more than needing finishing Power threshold, controls described motor and quits work, and sends the warning instruction changing emery wheel.

4. device as claimed in claim 1, it is characterised in that described default thermostatic control Model is realized by following formula, particularly as follows:

${\mathrm{\θ}}_m=\frac{\mathrm{\γ}\·P}{bc\mathrm{\ρ}}\sqrt{L_i^3/v_i}$

Wherein, θ_mMaximum temperature for current emery wheel Yu surface, camshaft contact area；γ is constant temperature control Simulation temperature correction coefficient；P is the power that described motor is current；B is the width of camshaft；ρ Density of material for camshaft；C is the specific heat capacity of camshaft；I is the angle of camshaft；L_iFor often The contact arc length that i degree camshaft is corresponding；v_iInstantaneous linear velocity for every i degree camshaft.

5. device as claimed in claim 4, it is characterised in that described every i degree camshaft is corresponding Contact arc length L_iRealized by following formula, particularly as follows:

$L_i=\sqrt{\frac{d_s\·d_i\·a_e}{d_s+d_i}}$

Wherein, i is the angle of camshaft；d_sDiameter for emery wheel；d_iConvex corresponding to every i degree The equivalent diameter of wheel shaft；a_eFor the emery wheel cutting-in to camshaft；

Instantaneous linear velocity v of described every i degree camshaft_iRealized by following formula, particularly as follows:

$v_i=\frac{n_i}{60}\·\mathrm{\π}\·d_i$

Wherein, i is the angle of camshaft；d_iThe equivalent diameter of the camshaft corresponding to every i degree； n_iTransient speed for every i degree camshaft.

6. the constant-temperature control method of a Camshaft Grinding processing, it is characterised in that including:

Power measurement module measures the power of motor in real time, and is exported by described power, wherein, Described motor is the motor of the emery wheel electro spindle that camshaft carries out grinding；

Thermostatic control module receives the power of described power measurement module output, and according to described merit Rate and default thermostatic control model calculate the highest of current emery wheel and surface, camshaft contact area Temperature；

Described maximum temperature is compared, if sentencing by described thermostatic control module with the temperature threshold preset Break and know that described maximum temperature greater than or equal to described default temperature threshold, then controls described electricity Machine reduces camshaft speed, and reduces the emery wheel cutting-in to camshaft.

7. method as claimed in claim 6, it is characterised in that described method also includes:

If described thermostatic control module judges to know that described maximum temperature is less than described default temperature Threshold value, then control described motor and improve camshaft speed, and increase the emery wheel cutting-in to camshaft.

8. method as claimed in claim 6, it is characterised in that described method also includes:

If described thermostatic control module judges described power more than the power threshold needing finishing, Control described motor to quit work, and send finishing or change the warning instruction of emery wheel.

9. method as claimed in claim 6, it is characterised in that described default thermostatic control Model is realized by following formula, particularly as follows:

${\mathrm{\θ}}_m=\frac{\mathrm{\γ}\·P}{bc\mathrm{\ρ}}\sqrt{L_i^3/v_i}$

Wherein, θ_mMaximum temperature for current emery wheel Yu surface, camshaft contact area；γ is constant temperature control Simulation temperature correction coefficient；P is the power that described motor is current；B is the width of camshaft；ρ Density of material for camshaft；C is the specific heat capacity of camshaft；I is the angle of camshaft；L_iFor often The contact arc length that i degree camshaft is corresponding；v_iInstantaneous linear velocity for every i degree camshaft.

10. method as claimed in claim 9, it is characterised in that described every i degree camshaft is corresponding Contact arc length L_iRealized by following formula, particularly as follows:

$L_i=\sqrt{\frac{d_s\·d_i\·a_e}{d_s+d_i}}$

Wherein, i is the angle of camshaft；d_sDiameter for emery wheel；d_iConvex corresponding to every i degree The equivalent diameter of wheel shaft；a_eFor the emery wheel cutting-in to camshaft；

Instantaneous linear velocity v of described every i degree camshaft_iRealized by following formula, particularly as follows:

$v_i=\frac{n_i}{60}\·\mathrm{\π}\·d_i$

Wherein, i is the angle of camshaft；d_iThe equivalent diameter of the camshaft corresponding to every i degree； n_iTransient speed for every i degree camshaft.