DD215736A1 - GRINDING BOLT WITH INNER COOLING AND RELATED GRINDING BODY RECEIPT - Google Patents

Abstract

The invention relates to a grinding body, constructed from Schleifkoerpersegmenten with radially extending channels at the Fuegestellen the Schleifkoerpersegmente and the associated Schleifkoerperaufnahme whose bores lead to said channels. In particular, the invention is intended for a tooth flank grinding machine which operates in Teilwaelzverfahren with Doppelkegelschleifkoerper. The aim of the invention is to increase the Arbeitsproduktivitaet and working accuracy in the tooth flank grinding, without significantly increasing the effort in the design of the product, while maintaining or reducing the operating costs. The object of the invention is to increase the effectiveness of the available Kuehlschmiermittels at the interfaces between the abrasive body and tooth flank and to increase the rigidity of the overall system Schleifkoerperaufnahme / Schleifkoerper. In the solution according to the invention, this is achieved in that radially extending channels are formed at the root points of the abrasive body segments, which are supplied with a cooling lubricant via holes located in the abrasive body receptacle and thus allow internal cooling during the grinding process. By using annular rings between the segment grinding body and the grinding body holder it is achieved that on the one hand a safeguard against the extraction of the abrasive body segments due to the centrifugal force occurring from the Segmentschleifkoerper and on the other hand by adjusting the round ring to the unevenness of the Schleifkoerpersegmente a higher rigidity and effective vibration damping is achieved ,

Description

Title of invention ₍ , '''' \

Grinding wheel with internal cooling and associated grinding wheel holder

Field of application of the invention. '' 'I

The invention relates to an abrasive body, preferably constructed of abrasive segments with radial channels and the associated Schleifkörperaufnähme, in particular for a tooth flank grinding machine, which operates in Teilwälzverfahren with Doppelkegelschleifkörper.

Characteristic of the known technical solutions | The large energies occurring during the grinding process are converted into heat to a considerable extent at the interface, which heats the surface layer of the hardened tooth flank and leads to thermally induced grinding errors. On the one

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on the one hand it comes to a tempering of the tooth flank and a consequent reduction in hardness, this flaw error is expressed by various temper colors, which are visible as burn marks.

The second thermally induced grinding error also takes place a starting process. The action of the cooling medium leads to a secondary hardening of the tooth flank and to a different microstructure formation. Associated volume differences between ferritic, ', austenitic and martensitic microstructures lead to stresses in the surface layers, which may result in grinding cracks. In grinding practice, the max. Delivery, in which these thermally induced grinding errors just do not occur, referred to as Grenzzustellung.

Influence on the limit feed and thus on the productivity of the tooth flank grinding have the material properties and gear parameters of the gear, the technological cutting conditions, the cooling lubrication and the specific Schnittkcaft.

Of these influencing variables, essentially only the specific cutting force and the cooling lubrication can be influenced. The increase in the effectiveness of the cooling lubrication led to improved solutions for supplying the cooling lubricant at the periphery of the grinding wheel.

Thus, a device is known in which the available amount of cooling lubricant in the tooth flank grinding with double bevel grinding body is in each case supplied to the tooth flank, which is being ground (DD -VVP 142 678). In a further advanced Lgsung in tooth form loops (Fa. Liebherr, FRG) is the Z führdüse _u designed as a forming die, which encloses the active profile of the SchMfkörpers. Synchronously with the Abrichtzustellung the feed nozzle is tracked to the grinding wheel, so that there is always a constant gap width.

A disadvantage of these solutions is that the cooling lubricant is thrown by the rotating grinding body and only a small part passes to the active grinding zone. Furthermore, a considerable technical effort is required for tracking the nozzles. There were therefore solutions for a

, Internal cooling proposed in which the cooling lubricant _{β is} supplied within the receiving bore of the grinding wheel and diffused by virtue of the centrifugal force in the cavities of the grinding wheel and penetrates to the outside. Due to the small amount of coolant that arrives at the periphery of the abrasive article, this method is not for tooth flank grinding

''suitable. Contaminated cooling lubricant clogs the cavities very quickly.

In a further known solution (DE - PS 884005), the grinding body is provided with channels which work in the working surface and via which d3s cooling lubricant is supplied. The production of such an abrasive body with channels is associated with the known manufacturing processes with a higher technical complexity. ,

The cooling lubricant is simultaneously supplied to all opening in the working surface of the abrasive body channels. In particular, when tooth flank grinding the use of the proposed abrasive body for several reasons is not possible. In order to achieve a cool finish, large feeds of the cooling lubricant are required so that a sufficient quantity is available at the active grinding zone.

/ This requires a large space requirement for the collecting container of the cooling lubricant and for the required filter devices and the realization of large return channels. As a result, the energy demand for conveying and cooling as well as the operating costs increase.

For precision grinding, an accurate and rigid grip of the grinding wheel is required,.

The fulfillment of this requirement is not possible with the abrasive article described in DE - PS 884005.

To reduce aer specific cutting force grinding lower hardness and higher porosity are recommended. In precision grinding, in particular tooth flank grinding, however, these measures are limited because the risk of wear-related Teilungsabweichujngen increases. '

To achieve a low specific cutting force and a cooler grinding and technical reasons of another kind such as. Increasing the peripheral speed and manufacturability of large abrasive particles has therefore been proposed, in particular for large abrasive bodies, the construction of segments. At the same time, when using abrasive segments, measures must be taken to prevent them from dissolving out of the abrasive dressing due to centrifugal forces that occur.

Thus, an invention of a Segmentschleifkörpers when grinding in circumferential grinding according to DD-WP 97584 is known in which the foot

of the segment is trapezoidal.

In an invention according to DE - OS 2161 942 the use of self-locking abrasive segments is proposed, wherein the segments against each other interlocked or wedged and openings are provided in the toothing or wedging, which serve to cool the segments wherein the coolant is fed tangentially to the grinding wheel axis.

In the forms described, the use of the proposed abrasive segments in tooth flank hardened gears is not applicable because they are intended for face grinding. Previously used grinding wheels in the tooth flank grinding are designed as a monoblock low inherent rigidity. A further disadvantage is that tangential tensile stresses occur in the area of the grinding wheel bore.

In order to increase the grinding performance and the ground quality of the workpieces, measures have been proposed to improve the clamping possibilities.

In the inventions DE-OS 2405 048 and DE-OS 2405 028 solutions are described in which adapt the receiving devices of the grinding wheels to the bumps in the clamping zone, whereby bending stresses and axial deformations are avoided, while achieving high adhesion coefficients, the proposed solutions require a higher technical effort through the use of ring-shaped or plate-shaped intermediate links.

Object of the invention

The aim of the invention is to increase the work productivity and working accuracy in tooth flank grinding, without the

for the manufacture of the product, while maintaining or reducing the cost of ownership.

Principle of the invention, 'The invention has the object of providing a means to' create / consisting micrograph of a grinding body and a Schleifkörper- / ¹ to the efficacy of the stand- for grouting * the cooling lubricant "at the interfaces between To increase grinding body and tooth flank as well as to increase the rigidity of the entire system of grinding wheel holder / grinding body. According to the invention, the object is achieved, for example, in that four similar segments are assembled without joints to form a closed annular double-cone grinding body. The ^ - segments are at the joints with two radially extending

Provide grooves that are assigned to the respective conical surface of the double cone: sanding body.

By joining the segments, these grooves provide at the interfaces guide channels for the coolant. The Aufnahrnekörper for the abrasive segments is larger in diameter and more compact than previous body for abrasive bodies with hole designed.

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Both the segments and the receiving body are provided with concentric grooves, in which commercial round rings are inserted.

In a further embodiment, the segments have a dovetail-shaped foot, which is positively connected to the receiving base body. The supply channels with • supply grooves for the cooling lubricant in the Schleifkörperaufnhrne are designed so that the radial Führunaskanäle be acted upon only with cooling lubricant, if the segments have sliding contact.

The advantages of the solution according to the invention are that present for supplying the cooling lubricant to the interface. , centrifugal forces are used and the coolant is fed directly to the contact zone between the grinding wheel and the tooth flank. Regardless of the diameter of the abrasive body are always the same supply conditions for the cooling lubricant before, without the need for additional technical effort is required.

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Increasing the overall rigidity of the system also makes it possible to increase the torque transmission between the grinding spindle and the grinding wheel. The proposed solutions lead zu.einer increase in productivity and accuracy, preferably on tooth flank grinding machines, due to changes in the abrasive body design, abrasive pickup and appropriate supply of cooling lubricant.

embodiment

The invention will be explained in more detail below using an exemplary embodiment.

In the accompanying drawings show:

Fig. 1 section through the grinding wheel and grinding wheel holder

Fig. 2 section A-A of Fig. 1st

Fig. 3 abrasive body composed of abrasive segments

4 shows section B-B of FIG. 3

Fig. 5 particular embodiment of a grinding wheel segment

Fig. 6 Doppelkegelschleifkörper as a monoblock

In the exemplary embodiment, four abrasive body segments lj form an abrasive body 2 which is designed as a double-cone grinding body. '.' The abrasive body segments 1 are provided with four radially extending grooves 3, 4 and at least two concentrically extending grooves 5, 6. The four radially extending grooves 3, 4 are each assigned to a conical surface 7, S of the double-cone grinding body Abrasive segments 1 were seamlessly assembled with an adhesive 9. In this way, the radially extending grooves 3, 4 form channels 10, 11 in the assembled abrasive article.

The Schleifkörperaufnähme for the grinding wheel 2 consists of a receiving flange 12 and a clamping flange 13. In the receiving flange 12 which is connected to a grinding spindle 14, bores 15; 16 attached, the channels 10; associated with the grinding wheel 2. The grinding wheel 2 is surrounded by a covering hood which consists of a cap 17 fastened to the grinding spindle 14 and a lid 18.

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'On the lid 18, a flange 19 is attached, which with holes. 20-; äl and annular grooves 22, 23 is provided, wherein the annular grooves 22, 23 associated with the bores 15, 16 of the Aufnahme'flansches 12.

On the flange 19 hoses 24, 25 are attached

 Between the receiving flange 12 and the clamping flange 13 and the grinding body 2 round rings 26 are arranged, wherein the circular rings 26 in the grooves 5, 6 of the abrasive body segments 1 and in the groove 27 of the receiving flange 12 and in the groove 28 of the clamping flange 13 are inserted.

In a further embodiment of the abrasive article segments of FIG. 5, these have a trapezoidal foot

 To accommodate the trapezoidal foot of the receiving flange

12 and the clamping flange 13 designed accordingly. This version is not shown in detail.

The grinding body 2 may, as shown in FIG. 6, be designed as a monoblock with incorporated channels

The operation of the solution according to the invention is as follows: ₇ The abrasive body 2 is pre-assembled as a compact structural unit with the receiving flange 12 and the clamping flange 13 and placed on the grinding spindle fourteenth Be between the abrasive body segments 1 and the receiving flange 12 or .. clamping flange

13 round rings, 26 inserted, on the one hand as a centrifugal force protection, the abrasive segments 1, on the other hand, to improve the clamping conditions and the torque nübertragung.

In the embodiment of FIG. 5 no round rings 26 are inserted.

The lid 18 with the flange 19 and the hoses 24, 25 are

connected to the cap 17.

By defined adjustment of the flange 19 with its annular grooves 22, 23, a supply of Kühlschmxermittels only to the channels 10; ll _t located in the grinding zone,

After startup, the grinding spindle 14 is on / against grinding start ^K: ü hl schm ie midstream the tube 24 and / or 25 is supplied .from a not shown pressure near power generator.

If the conical surface 7 of the grinding wheel 2 is in sliding contact, the cooling lubricant flow is fed to the tube 25 via a reversing unit (not shown) and to the channels 10 via the holes 20 and 15. About the .Ringnut 22 ", the cooling lubricant is supplied only to the channels 10, which are located in the region of the tooth flanks of the gear to be ground.

If the cone sheath is in sliding contact, the cooling lubricant is supplied to the channels 11 via the hose 24, bore 21, annular groove 23, bore 16.

When Zvveif lankenschlif f receive the channels 10, 11 at the same time cooling lubricant from the pressure generator via the urn control unit, not shown.

Due to the centrifugal force of the rotating grinding body 2, the cooling lubricant is supplied at a considerable speed of the contact point between the grinding wheel 2 and gear.

Claims (8)

ν ': - 9 - .- ..., 1. Abrasive body and Schleifkörperaufnähme, in particular for • a Zahnflankanschleifmaschine that rfahren in Teilwälzve works with double-cone grinding koj-per, ·. characterized by in that abrasive body segments (1) are seamlessly assembled into a closed abrasive body (2) designed as a double-cone grinding body and the abrasive body segments (1) are provided at the joints with two radially extending grooves (3; 4), the channels (10, -1) ) with preferential prices round. Form a cross-section and that a receiving flange (12) j of the abrasive body (2) with holes (15; 16) is formed, which are associated with the channels (10; ll). 2. grinding body according to item 1,
characterized in that - in that the channel (10) is associated with a conical surface (7) and the channel (11) is associated with a conical surface (8J) of the abrasive body (2). 3. Abrasive bodies according to items 1 and 2,
characterized by that the abrasive body segments (1) arr at their joints with; a known adhesive (9) are joined together. > 4. Abrasive body according to points i to 3 _f
characterized by,. that the channels (10; 11) between the abrasive segments. (1) Only by the adhesive (9) are formed. 5. Abrasive body and Schleifkörperaufnähme according to item 1 to 4, characterized by, '_ / -, -.' in that the grinding body (2) is provided on the side faces with concentrically extending grooves (5; 6) and in that the receiving flange (12) and a clamping flange (13) also have concentric grooves (27; 28) corresponding to the grooves (5; are associated, wherein between the grooves (2) and (27) or (6) and (28) round fingers (26) are inserted. ..6, abrasive body to point characterized in that the grinding body (2) is designed as a honing block having paired channels (10; il). 7. abrasive article according to item 1, characterized in that the abrasive body segments (1) have a dovetail-shaped foot. · ' 8. Schleifkörperaufnähme according to item 1, characterized in that a flange (3.9) is fixedly connected to a cover (18) of an abrasive cover, that the flange (19) has bores (20; 21) and annular grooves (22; 23) and feed elements , preferably hoses '(24; 25)' are arranged on it and that the flange (19) relative to the dachshund (18) is rotatable and can be clamped with the lid (IS). For this 6-sheet drawing