Maschinenfabrik Gehring Gesellschaft MIT Beschrankter Haftung & Co.

Maschinenfabrik Gehring Gmbh & Co.

Maschinenfabrik Gehring Gmbh & Co Kg

Maschinenfabrik Gehring Gesellshaft MIT Beschrankter Haftung & Co.

Hans Grimm

Gunter Richter

Karl-Heinz Bergen

Ulrich Klink

Walter Lang

Ernst Lang

Hermann Fingerle

A method for finishing surfaces of workpieces includes a honing process with at least two method steps. In one of the method steps the surface, for example, the inner wall of a bore, is honed to a predetermined final dimension whereby a very fine structure with minimal depth of honing traces is generated so that a great portion of the surface functions as the supporting surface. In a further method step, which can be performed before or after the finishing-honing step, crossed grooves are provided in the surface by subjecting the surface to a stream of a medium, especially a laser, whereby the pattern of the grooves provides a lubricant reservoir for the future use of the workpiece. The treatment with a stream of a medium does not cause deformations at the edges of the grooves. This ensures an optimal distribution of the lubricant.

Method of finishing a surface of a workpiece

Pressure with which working parts of the honing tool are pressed against the bore wall is controlled during machining. The pressure per unit area of the working parts can thereby be kept constant or specifically varied, irrespective of the surface configuration of the bore wall. For this purpose, the honing machine includes a feed mechanism and electronic control device for predetermining the pressure of the working parts against the bore.

Process for honing bores and a honing machine for performing the process

A honing process using a honing machine as a honing arbor or spindle, the travel or stroke limit points of which can be set, and that also has a measuring device, with at least one sensor, mounted on the honing tool for the workpiece that is to be honed, as well as a regulating mechanism for controlling the honing process. The workpiece is measured during the honing process via the sensors, and during at least one measurement procedure, at least one parameter of the honing procedure is at least reduced.

Honing process

A method and apparatus for deburring the inner edge of the bore of a workpiece. A tool is introduced into the bore, is rotated at high speed, and has a wobbling movement imparted thereto. Alternatively, the tool can be rotated while a wobbling movement is imparted to the workpiece. The tool is embodied as a grinding rod which is held by a grinder unit which is drivingly connected with an eccentric drive. The grinder unit is preferably pivotable in all directions. During operation, the tool or the workpiece describes, in the bore of the workpiece, a wobbling movement having a circular path which is concentric to the axis of the bore, and having a diameter which increases in the direction toward the free end of the bore. The burr which is to be worked is thus very precisely removed in a simple manner without the danger that the burr is moved into the bore. Furthermore, the tool is embodied in a simple manner, so that it has a long service life.

Method and apparatus for deburring the inner edge of part of a workpiece

A grinding machine for machining the inner surfaces of workpieces. The machine has a bench to which are secured a workpiece headstock and a carriage which supports a grinder unit. The carriage can be moved on the bench via guides which are disposed on opposite sides of the grinder unit. Respective adjusting devices are provided for respectively pivoting a given one of the guides about an axis that is disposed at right angles to the axis of the grinder. The guides are formed by a circular guide and a roller guide arrangement which extend parallel to one another. The guides can be pivoted independently of one another to conform to the respective position of the workpiece axis, so that it is possible to achieve a precise alignment of the grinder axis relative to the workpiece axis, and at the same time to feed the tool against the wall of the bore which is to be machined. A very high machining precision is obtained in this way. Furthermore, the grinding machine is structurally straight forward.

Grinding machine

A device for honing workpieces. The device includes a rotatable and axially reciprocating honing tool which is guided by an upper and a lower end section in corresponding bearings of a workholding fixture, and also includes a drive rod between the honing tool and a machine spindle. This drive rod is flexible in the radial direction, which prevents out-of-balance at high rotational speeds of the honing tool as a result of excessive mass and excessive play in pivot bearings, while the associated uncontrolled vibrations are also prevented.

Device for honing workpieces

An electrical device for controlling the stroke length of a reciprocating tool carrier of a honing machine by controlling the stroke reversal points of the carrier includes a first compensating circuit for correcting deviations from a predetermined lower reversal point and a second compensating circuit for correcting deviations from a predetermined upper reversal point, the compensating circuits supplying respective reversal point signals to a comparator for comparison with a voltage representing the instantaneous position of the carrier along a stroke path. Each reversal-point signal is a sum of a reference signal, identifying an initial reversal point between the predetermined reversal points, and a composite signal formed as an algebraic combination of difference signals each representing the distance between the carrier and a predetermined reversal point (lower, in the case of the first compensating circuit, or upper, in the case of the second compensating circuit) upon motion reversal of the carrier during a respective reciprocation cycle thereof.

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Esslingen, Germany

Hans Grimm