DD223088A1 - METHOD AND DEVICE FOR MACHINING EXTERNAL AND INTERNAL DIAMETERS OF GRINDING BOLTS - Google Patents

Abstract

The invention relates to a method and a device for and / or simultaneous processing of outer and inner diameter of plane-parallel abrasive bodies, preferably cast, ceramic, green Schleifkoerperrohlinge. The aim of the invention is to increase the productivity of the production and the quality of the product and to save basic material. The invention had the object of finding a method and a device for machining of outer and inner diameter of plane-parallel grinding bodies, preferably plane-parallel pre-machined, cast, ceramic, green Schleifkoerperrohlinge find, in which the blank is tensioned by suitable means and set in rotation, and / or simultaneously processed outside and inside. The essence of the invention is that two axially movable clamping heads span the workpiece, the clamping unit is a centering device, a grinding device for the external machining and two axially movable and staggered drilling tools are assigned for the bore machining. The field of application of the invention extends to the aforementioned type of processing and processing machines for the production of abrasive bodies.

Description

Title of the invention

Method and device for machining outer and inner diameters of sliding bodies.

Field of application of the invention

The field of application of the invention extends to a method and an apparatus for producing sliding bodies, in which, non-circular,. deviating from the cylindrical shape, with and without the bore and / or low strength, in particular plane-parallel abrasive ,, cast ceramic green Schleifkörper- _r blanks are processed in a voltage outside and inside. ^: . .! · ·.

Characteristic of the known technical solution.

There are already methods and devices for the production of Schieifkörpern, especially cast, ceramic, green Schieifkörperrohlinge, with separate operations, in which clamped sheets are used as Ausstechwerkzeuge ,, known. The moldings produced by the casting process, characterized by the resulting strong deformation during the drying process, deviate greatly in geometric dimensions of diameter, deviation from circle and cylindrical shape from final dimensions and in most cases have no bore.

The method used to date for cast ceramic green cast green blanks involves increased expenditure of time, increased outside diameter machining allowances, and partial failure of a stress not suitable for processing low strength blanks.

The known methods turning with steel bell, grinding and calibrating with steel sand work with. In each case, a newly centered workpiece and thus often require insufficient Lägetoleranzen from outside to inside diameter and necessary

Resetting times. , '. , . '

Object of the invention

The aim of the invention is to provide a method and an apparatus for and / or simultaneous machining of outside and inside diameter of plane-parallel pre-machined, non-round grinding wheels in a tension, wherein it is possible to increase productivity by saving Umspannzeiten and superimposed To improve machining times for outside and inside diameters, to increase the quality of geometric lancing and to save base material, due to reduced machining allowance, for the outside diameter. , ,

Explanation of the invention!

-The technical problem, which is solved by the invention

The invention is / an object of the invention to provide a method and apparatus for the production of abrasive körp em, preferably non-round, cast, ceramic, plane-parallel pre-machined, green abrasive blanks with and without bore and / or low strength, in which the workpiece tensioned with suitable means for entrainment, inside and outside and / or simultaneously processed. "'.

Features of the invention. ;

According to the invention the object is achieved in that the Schieifkörperrohling in a voltage and / or simultaneously ground outside and the bore is machined from two sides, wherein the one side of the blank with an amount which is smaller than the width of the screed, worked and of the other side is finished.

¹ device according to the invention consists of two horizontally axially adjustable clamping heads, which a centering device,

for the external machining of the abrasive body blank, a grinding device and for the bore machining two axially movable and / or reciprocating drilling tools are assigned. ':.

The abutment rings of the clamping heads have a covering of porous rubber and are connected to the mounting flange via studs. The drilling tools arranged on both sides are arranged mutually offset with respect to the axis of rotation. ,

The erfihdungsgemäße execution of the method and the device a more effective, accurate and material-saving processing is achieved. , '.

Embodiment. :

The device according to the invention is explained in more detail below on an embodiment sb egg game.

The accompanying drawing shows the working area of the device in a schematic sectional view from the front.

According to Pig. 1 are on a base body (1) on both sides two. horizontally axially movable in opposite directions and replaceable in size clamping heads (2), of which one is driven and the other runs along freely, the Anlageringe (3) with porous rubber (4) are occupied and between Anlagering (3) and mounting flange (5 ) Stud bolts (6) are used.

Below the entire clamping unit, an axially displaceable and height-adjustable fork-shaped centering device (7) is mounted, the fork spacing corresponding to the diameter of the blank body and its health.

Centrally to the clamping unit are axially movable drill rods (8) on both sides, on the front side in detachable Verbindung'Bohrwerkzeuge (9) with exchangeable and adjustable sheet tools (10), preferably carbide inserts, axially offset alternately.

An unillustrated drive motor with a grinding spindle drives a grinding wheel (11), which is arranged in the horizontal plane behind the workpiece and is delivered via a feed drive for processing the outside diameter. An abrent device, also not shown, can be mounted in the workspace.

Known 'settable travel limits ensure the processing of the blank to liennmaßgröße. The workflow is characterized in that.

a.) The blank by hand on the extended fork of the centering device (7) upended.,

b) the blank is tensioned axially by means of the clamping heads (2) ,.

c) the centering device (7) retracted,

d) the entire clamping unit is rotated,

e) the right boring bar (8) with tool. (9) moved ahead for a limited distance and moved back after the bore has been processed,

f ^1), the pre-drive, left drill rod, the bore ^fertigbeer-: beitet and then, moved back. '^

g) .and / or at the same time as e) and f) the rotating grinding wheel (1T) moves up to the blank at ¹ and after reaching; of the perfection-it moves back

ι, ''

h): a signal indicates the completion of the blank,

i) after opening the protective flap of the working area, the. tensioning. heads (2); time-delayed - moved out and the blank, taken by hand, ·

j) the centering fork (7) is moved forward.

All working movements, except for the speed of the working grinding wheel, are infinitely adjustable. ,

Surprisingly, it has been shown that even at relatively low clamping pressure of the glued porous rubber (4), on the Anlagerung ^! (3) not only compensates flatness defect of the ceramic workpiece, "but also their mechanical processing

without lateral displacement secures.

As a result of selected direction of rotation and speed of the workpiece, axial movement and mutually to the axis of rotation of the works / ·. ·. As a result of the examinations without any damage to the obtained bore of the ceramic body having a low mechanical strength, the resulting residual piece drops out obliquely towards the rear when machining the bore.

Claims (7)

Claim for invention, 1./Verfahren for machining outer and inner diameter tone "plane-parallel grinding bodies, preferably molded kb'rperrohlinge, .keramischer, green grinding, - characterized: in ' that ground in a voltage and / or simultaneously the outer diameter and bear the bore from two sides. works, whereby the one, side only worked on and by the. second page is finished. '. 2 Apparatus for carrying out the method according to item 1, characterized by ' that two axially adjustable clamping heads (2) are arranged, which are a centering device (T), a grinding device for external machining, (11) and for the .Bohrungsbearbeitung two axially movable drilling tools. (9) are assigned. 3. Gate direction to point '2 ..,. characterized 'thereby , -. -. .. that the centering device (7) consists of a fork which is axially movable and radially adjustable. 4. Device according to item 2, characterized by that the clamping heads (2) from each a mounting flange (5) -, an abutment ring (3), connected by stud bolts (6), be, and the plant side to the workpiece a coating of > ,. has "porous" rubber (4). "-" 5 "device according to item 2 /, characterized in that the drilling tools (9) based on the sense of rotation of - :. Workpiece on the right side behind the axis of rotation and left side offset by 180 ° in front of the axis of rotation are. For this 1 page. drawings 7 "