CN1102799A - Dressing method of super-hard abrasive partical grinding wheel - Google Patents

Abstract

The present invention belongs to the technological field of fine machining and the said dressing process is that the grinding wheel to be dressed rotates around X axis at certain rotation speed and the grinding wheel dressing tool reciprocates to feed along the Y axis while rotation. For each dressing process, the dressing tool is fed successively at certain speed along Z axis. The rotation axis of the dressing tool is at certain angle, Alpha, to the direction perpendicular to the Y axis. Based on the relation of the angle Alpha to the contour dressing amount of grinding wheel, the angle Alpha is adjusted.

Description

Dressing method of super-hard abrasive partical grinding wheel

The present invention relates to a kind ofly, belong to the precise machine machining field requiring to have the method that concave or convexity profile superabrasive wheel are processed or repaired.

The finishing of superabrasive wheel (as skive and CBN emery wheel) can be with common cup emery wheel such as silicon carbide grinding wheel, alundum wheel etc. as trimmer, the finishing superabrasive wheel, and its finishing principle is as shown in Figure 1.Trimmer emery wheel 2 is with n ₂The rotating speed spinning is back and forth sent do finishing motion to speed v simultaneously on perpendicular to the Y direction of the axis that is trimmed emery wheel 1.Stroke of every feed motion, two emery wheels along the Z direction relatively near an amount of feeding △.Adjust the spinning axis of emery wheel 2, make it, so that be trimmed profile finishing the becoming straight line of emery wheel perpendicular to v.If will make crushing is the special-shaped face, as the garden arc convex surface, then as shown in Figure 2, except that above-mentioned basic finishing campaign, it is moving along controlled motion track composition string pendulum also need to control trimmer emery wheel 2.

The objective of the invention is to design a kind of processing or method for trimming that is specifically designed to concave or convexity profile emery wheel, to adapt to that direct processing has the machine components of concave or convex-shaped or when this class part of plunge grinding, to the corresponding convexity of grinding wheel profile or the specific (special) requirements of concave.

Content of the present invention is:

The method for trimming of concave or convexity profile emery wheel is: be trimmed emery wheel 1 with the certain speed spinning, as cup-shaped, the barrel-shaped trimmer emery wheel 2 of dressing tool on one side with the certain speed spinning, one edge is back and forth made feed motion perpendicular to the Y direction of the axis that is trimmed emery wheel 1 with certain speed, send impulse stroke to for each, along the Z direction with the feeding one by one of certain amount of feeding.The spinning axis of trimmer emery wheel 2 is Z direction deflection given angle α with respect to its vertical direction along the feed rate of Y direction in the YOZ face, this α angle and the contour curve function z=f(x that is trimmed emery wheel 1) relation determine by following equation:

Wherein:

Effective working face of r-trimmer emery wheel single-revolution radius of a circle of taking up an official post, the parametric variable of equation, the span of r is r _i≤ r≤r _O;

x ₁, x ₂-be trimmed the X coordinate of left and right end points of the contour curve of emery wheel 1;

K(r, x, α)-by the equation (m of variable m, n ²)/(r ²)+(n ²)/((rsin α) ²) ellipse of expression is in the curvature at m=x point place:

$K(r,x,a)=\frac{\left|\frac{d^2\mathrm{<figure-callout\; id="2"\; label="n\; dm"\; filenames="941155722\_DRIMG1.png,941155722\_DRIMG2.png"\; state="\{\{state\}\}">n</figure-callout>}}{{\mathrm{dm}}^{}}\right|}{{[1+{\left(\frac{\mathrm{dn}}{\mathrm{dm}}\right)}^2]}^{\frac{3}{2}}}{|}_{m=;}$

R-is trimmed the radius of contour curve left end point on the emery wheel 1.

Description of drawings:

Fig. 1 is a prior art crushing schematic diagram.

Fig. 2 is the finishing schematic diagram of prior art medium plain emery wheel profile when being the dome arc.

Fig. 3 is a grinding wheel dressing method principle schematic of the present invention.

Fig. 4 is computation model figure.

Below in conjunction with accompanying drawing, introduce content of the present invention in detail.

As shown in Figure 3, set up rectangular coordinate system OXYZ, the axis that is trimmed emery wheel 1 is an X-axis, the axis of trimmer emery wheel is positioned at the YOZ face, it is symmetrical being trimmed emery wheel 1 installation site with respect to the Z axle in the XOZ face, or asymmetric, be trimmed the left and right terminal A of emery wheel 1 contour curve, the X-axis coordinate of B is made as x respectively ₁, x ₂, be trimmed emery wheel 1 and rotate around X-axis with certain rotating speed.Effectively the working face inside radius is r _i, outer radius is r _oEnd face trimmer emery wheel 2 on one side with certain rotating speed spinning, an edge Y direction is back and forth made feed motion with certain speed.For each the finishing stroke along the Z direction with the feeding one by one of certain amount of feeding.The rotation of trimmer emery wheel 2 in the YOZ face with respect to its vertical direction along the feed rate of Y direction, be Z direction deflection given angle α, this moment as adjustment trimmer emery wheel 2 are along the feed motion scope of Y direction, use the I section of trimmer emery wheel 2 to process and finishing process, can make and be trimmed the profile that emery wheel 1 obtains concave, as use the II section to process and finishing process, then obtain the profile of convexity.The α angle be trimmed the contour curve function z=f(x that emery wheel 1 obtains) relation determine by above-mentioned equation.

It calculates principle and is described as follows:

As Fig. 4, trimmer emery wheel 2 is that radius is that the excursion of variable r(r is r _i≤ r≤r ₀), width is the aggregate of the thin drum of dr.Because trimmer emery wheel 2 has spinning campaign, be to be that the thin drum end face of radius is justified with r perpendicular to its spinning axis so each thin drum will keep its working surface; Because the rotation of trimmer emery wheel 2 is in the YOZ plane and with respect to Z axis deviation α angle, it is major axis radius with r that the projection of shape of this thin drum end face circle in the ZOX face is one, and rsin α is the ellipse of minor axis radius; Because the feeding of Z direction and the feed motion of Y direction, these oval aggregates will be to accomplish the profile that is trimmed emery wheel 1 along moving of Y direction jointly, the position that is trimmed close Z axle on the emery wheel 1 is accomplished by the big ellipse of curvature (promptly by the little thin drum end face circle of radius r), then accomplish from the position that the Z axle is far away by the little ellipse of curvature (promptly by the little thin drum end face circle of radius r), therefore accomplish the position accordingly, the curvature of contour curve will equal to do to accomplish at this some the curvature of respective point on the ellipse of motion, obtain thus in the formula about contour curve curvature

$\frac{\left|Z^{\&prime;\&prime;}\right|}{{(1+{\mathrm{<figure-callout\; id="1"\; label="Z"\; filenames="941155722\_DRIMG1.png,941155722\_DRIMG2.png"\; state="\{\{state\}\}">Z</figure-callout>}}^{1^1})}^{\frac{3}{2}}}=$ ... formula

After entering stabilization process simultaneously, impulse stroke for each amount of feeding, be trimmed the contour curve shape invariance of emery wheel 1, the removal height that promptly is trimmed emery wheel 1 is impartial along distributing on the contour curve line length, the wearing course height of trimmer emery wheel 2 also distributes impartial on its effective working face, and trimmer emery wheel 2 the abrasion volume of the arbitrary anchor ring on its working face accomplish with it to be trimmed on the emery wheel 1 the removal volume on the corresponding site line length proportional, therefore the circumferential area on the line length that is trimmed corresponding site on the emery wheel 1 accomplished with it of the area on trimmer emery wheel 2 arbitrary anchor rings is proportional, obtain thus in the formula about

$\frac{{\&Integral;}_{r_1}^{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="941155722\_DRIMG1.png,941155722\_DRIMG2.png"\; state="\{\{state\}\}">r</figure-callout>}}2\mathrm{\&pi;rdr}}{{\&Integral;}_{r_1}^{{\mathrm{<figure-callout\; id="0"\; label="r"\; filenames="941155722\_DRIMG2.png,941155722\_DRIMG4.png"\; state="\{\{state\}\}">r</figure-callout>}}_0}2\mathrm{\&pi;rdr}}$ ... formula

Can determine α and the contour curve function z=f(x that is trimmed emery wheel 1 that obtains by the differential equation and primary condition thereof that above-mentioned two formulas are represented) between relation.

Based on the above method, make it around a certain angle of Y-axis deflection, then can obtain the profile that the curve deflection of above-mentioned expression forms as the axis of rotation of adjusting trimmer emery wheel 2.

The method of the above-mentioned finishing superabrasive wheel of the present invention design also can be used for requiring to have the plain wheel of concave or convexity profile and the workpiece of any material is processed or repaired.

Claims (2)

1, the method for trimming of a kind of concave or convexity profile superabrasive wheel, being trimmed emery wheel rotates around X-axis with certain rotating speed, cup-shaped as dressing tool, barrel-shaped emery wheel is on one side with certain rotating speed spinning, one edge Y direction is back and forth made feed motion with certain speed, send impulse stroke to for each, along the Z direction with the feeding one by one of certain amount of feeding, it is characterized in that: described cup-shaped as dressing tool, the spinning axis of barrel-shaped emery wheel is Z direction deflection given angle α with respect to its vertical direction along the feed rate of Y direction in the YOZ face, this α angle be trimmed concave that emery wheel obtains or the relation of convexity contour curve function Z=f (x) and determine by following equation:

Wherein:

Effective working face of r--trimmer emery wheel single-revolution radius of a circle of taking up an official post, the parametric variable of equation, the span of r is r _i≤ r≤r _o

x ₁, x ₂--be trimmed the X coordinate of left and right end points of the contour curve of emery wheel 1;

K (r, x, a)--by the equation m of variable m, n ²/ r ₂+ n ²/ (rsina) ²The ellipse of=1 expression is in the curvature at m=x point place:

$K(r,x,a)=\frac{\left|\frac{d^{2}n}{{\mathrm{dm}}^2}\right|}{{[1+{\left(\frac{\mathrm{dn}}{\mathrm{dn}}\right)}^2]}^{\frac{3}{2}}}{|}_{m=;}$

(r, x are about r a) to K, the function of x and a;

R--is trimmed the radius of contour curve left end point on the emery wheel 1.

2, a kind of method for trimming to concave or convexity profile superabrasive wheel as claimed in claim 1 is characterized in that this method is used for the plain wheel and the workpiece that require to have concave or convexity profile are processed or repaired.

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