DD223654A1 - SCHLEIFKOERPER, PREFERRED DOUBLE KEGELSCHLEIFKOERPER - Google Patents

Abstract

The invention relates to a grinding body, preferably a double-cone grinding body for a tooth flank grinding machine. The object of the invention is to increase the effectiveness of the cooling lubricant at the active grinding zone and to achieve an interrupted chip formation over the entire working range of the tooth flanks to be ground. In the solution according to the invention, this is achieved by providing the double-cone grinding body with an arbitrary number of radially extending cooling grooves on both sides, wherein the cooling grooves are offset at an angle on both sides of the double-cone grinding body. The cooling grooves are straight, curve-shaped, arranged in particular in the form of an Archimedean spiral. Fig. 1

Description

Title of the invention

Grinding wheel, preferably double-cone grinding wheel

Field of application of the invention

The invention relates to a grinding wheel, preferably a double bevel grinding wheel, for a tooth flank grinding machine operating according to the partial rolling method.

Characteristic of the known technical solutions Thermally caused Sdhleifschaden be on the one hand as burn marks. On the other hand as a grinding cracks visible on the ground surface.

Causes and effects have been set forth in numerous publications, eg in the thesis ^: von Kosche "The damage-free gear grinding of case hardened cylindrical wheels of 15 Mn Cr 5", TH Aachen, In some grinding methods was primarily evaluated in evaluation of the results so far, the Kühlschmierbe-. conditions through the combined use of cooling and cleaning nozzles (eg tlbschliff / Germany).

Further practical measures include the installation of baffles with the aim of interrupting the air flow circulating through the rotating grinding body in order to facilitate the advance of the cooling lubricant to the surface of the grinding wheel.

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In another solution for tooth flank grinding (Liebherr / BSD), the feed nozzle of the cooling lubricant is designed as a shaping nozzle which can be tracked with respect to the grinding body. , A disadvantage of these solutions is that regardless of all the measures carried out a considerable portion of the cooling lubricant is thrown by the grinding wheel. , ' , . It has therefore been proposed to feed the cooling lubricant from the inside to the grinding body so that it diffuses through the natural cavities and thus reaches the active grinding zone using the centrifugal force effect of the rotating grinding body.

In a solution according to DE-PS 970 208 cooling liquid · is supplied through the cavities of the grinding wheel. Outside the mounting flanges, this grinding wheel is grooved to increase the surface area of the diffusing coolant. '

This method is unsuitable, especially for biface grinding, because contaminated cooling lubricant clogs the cavities and thus supplies an insufficient amount of cooling lubricant to the periphery of the abrasive article.

For the first time, therefore, especially for tooth flank grinding, it has been proposed to provide radially extending channels for transporting the coolant from the inside to the outside within the abrasive body, wherein according to the invention the abrasive body is constructed either of segments on whose side surfaces these channels are arranged, or as a monobloc is formed with pairs arranged channels (DD-WP B 24 D / 251 283.5).

The advantage of this solution is on the one hand in the large volume of the cooling lubricant, which is supplied to the active grinding zone * On the other hand, it is particularly advantageous that. the openings of the channels at the Schleifkörperperipherie an interrupted cut arises ', which leads to' an interrupted chip formation, which has a reduction of contamination of the abrasive body surface, the result.

The disadvantage, however, is that the use of these abrasive segments requires measures for centrifugal force protection.

On the other hand, the proposed design of the grinding wheel as a monoblock with inner channels requires a high level of technological complexity.

The broken cut, which is recognized as an advantage, can still not be achieved with the proposed solution on the entire conical surface of the double-cone grinding body. The cooling grooves are each perpendicular to the tangent at its mouth so that a directional optimization of the cooling lubricant flow between the periphery of the grinding wheel and the workpiece is not possible.

In a further inventive proposal (SU - 872 234) are in a cylindrical abrasive body from the bore to. Periphery of the grinding wheel mounted in the axial section oblique cooling grooves. In the circumferential direction, these cooling grooves are straight. '

The disadvantage is that with the reduction of the abrasive wheel diameter caused by the dressing process, the effectiveness of the cooling grooves in the active grinding wheel at the periphery of the abrasive wheel is reduced. The proposed shape of the cooling grooves, the inertial forces occurring in rotating reference systems are insufficiently used, so that the cooling liquid does not reach the cut surface optimally.

Object of the invention

The aim of the invention is to increase the productivity of the method tooth flank grinding, while increasing the working accuracy.

Explanation of the essence of the invention

The invention has for its object to make a grinding wheel so that the effectiveness of the Kühlschmierraittels increased at the active grinding zone and an interrupted cut is achieved during the cutting process. According to the invention the object is achieved in that a double-cone grinding body is formed on both sides with any number of radially extending cooling elements,

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wherein the cooling grooves are offset on both sides of the double-cone grinding body at an angle and the depth of Kuhlnuten reaches a maximum of half the width of the double-cone grinding body and the depth of the cooling grooves is constant. The cooling grooves extend from the abrasive-body bore to the periphery of the double-cone grinding body in a straight line or curved, preferably in the form of an Archimedean spiral. The cross section of the cooling grooves is trapezoidal and has a radius at the base. * .; , .- '. '-'. The advantages of the solution according to the invention are that when grinding the cooling lubricant on the entire body located in the grinding ^ abrasive body width exits. A mainly in the tangential direction exiting cooling lubricant flow is our optimal use of inertial. _: Krä, fte centrifugal force and Carioliskraft- achieved by a special design of Kühlnuten. Since the abrasive body is designed as Monoblpck, measures to safeguard against tears are not required.

The designs of the abrasive allow it that for. the production of the previously common technolog'gie can be used. '. _";... ''

Execution example,

The invention will be explained in more detail below with reference to an exemplary embodiment. ,

In the accompanying drawing show:

Fig. 1 side view of the double-cone grinding body with

straight running cooling channels Fig. 2 section A-A according to Fig. 1 'Fig. 3' view X of Fig. 1 Fig. 4 particular embodiment of the cooling channels of FIG.

In the embodiment, the double-cone grinding body (1) is formed with the cooling grooves from the grinding-body bore to the periphery of the double-cone grinding body (1), straight cooling grooves (2) for the right side and cooling grooves (3) for the left side have a constant depth. The cooling grooves (2) are opposed,

arranged offset in an angle over the cooling grooves (3). The depth of the cooling grooves (2, 3) does not exceed half the width of the grinding wheel (1).

According to Fig. 3, the cooling grooves (2, 3) are trapezoidal in cross-section and rounded at its base. 4, the cooling grooves (2, 3) are curved, preferably in the form of an Archimedean spiral.

The use of the described Ooppelkegelschleifkörpers (1) on tooth flank grinding machines takes place in conjunction with the proposed in the invention according to DO-WP B 24 D / 251 283.6 abrasive body aufzuaufme.

The cooling lubricant according to this invention is supplied via the abrasive body aufauf such that only the cooling grooves (2) are acted upon by cooling lubricant when the right side of the double-cone grinding body (1) is in the grinding process. On the other hand, the supply of the cooling lubricant to the cooling grooves (2) is interrupted and fed to the cooling grooves (3): * when the left side of the double-cone grinding body (1) grinds.

Due to the centrifugal force and the Coriolis force acting on the cooling lubricant within the rotating double-cone grinding body, the cooling lubricant exits at the periphery of the double-cone grinding body (1), at the location also in sliding contact with the workpiece

In a further, not shown, Ausführungsforra the cooling lubricant is passed outside the Schleifkörperaufnähme in the cooling grooves. '

This may optionally be ura fixed or synchronously with the grinding wheel speed circulating feed.

Claims (4)

e'o1 »1C '^ B °' β aft. ' «'*« Ί ο ο * claim for invention v 1·; Abrasive body, in particular double-cone grinding body for a tooth flank grinding machine operating according to the partial rolling method,
characterized by the double-cone grinding body (1) is formed on both sides with an arbitrary number of radially extending cooling grooves (2; 3), the cooling grooves (2) being angularly offset from the cooling grooves (S ₁ ) and maximizing the depth of the cooling grooves (2; 3) extends to half the width of the double-cone grinding body (1) and the depth of the cooling grooves (2, 3) is constant » 2. Abrasives according to item 1, /. characterized by., · that the cooling grooves (2, -3) from the abrasive body bore to the periphery of the double-cone grinding body (1) straight-dowelled «'' - 3. Abrasive article according to point 1, »characterized by in that the cooling grooves (2; 3) run in a curve from the grinding-body bore to the periphery of the double-cone grinding body (1), the curve being preferably an Archimedean spiral. 4, abrasive article after item 1 to 3,
characterized by ,, in that the cross-section of the cooling grooves (2, 3) is of trapezoidal design and has a radius on another base. , - see 3 sheet drawings -