WO2019057579A1

WO2019057579A1 - Precision finishing machine

Info

Publication number: WO2019057579A1
Application number: PCT/EP2018/074584
Authority: WO
Inventors: Markus Mueller; Raphael Koenig; Daniel Sonntag
Original assignee: Supfina Grieshaber Gmbh & Co. Kg
Priority date: 2017-09-19
Filing date: 2018-09-12
Publication date: 2019-03-28
Also published as: CH715468B1; CN111093899A; DE102017121692A1

Abstract

The invention relates to precision finishing machine, with a tool which has a rotating effective surface (36, 44) for machining a workpiece, wherein for rotationally driving the tool a drive which drives the tool about an axis of rotation (58) perpendicular to the effective surface is provided, wherein the drive takes the form of a torque motor which has a stator and a rotor, wherein the rotor is connected to the tool without any further gear elements in between and drives the tool about the axis of rotation (58).

Description

Title: Finishing Machine

description

The invention relates to a finishing machine, with a tool that has a rotating effective surface for

Processing a workpiece, wherein for the

Rotary drive of the tool, a drive is provided, which is the tool to a perpendicular to the active surface

Rotary axis drives. From EP 2 689 891 A2 a two-disc machine for surface treatment is known in which a

monolithic unit is provided from a hard rock, which serves to arrange various drives and gearbox. The present invention has for its object to provide a fining machine with the simplest possible structure. This object is achieved according to the invention in a finishing machine of the type mentioned in that the drive is designed in the form of a torque motor having a stator and a rotor, wherein the rotor is connected to the tool without the interposition of other transmission elements and the tool to the

Rotary axis drives.

According to the invention, a compact drive is provided, which makes it possible to arrange further bulky additional components of a fine-machining machine such that

altogether a compact and simply constructed

Finishing machine can be provided. The torque motor according to the invention is low-maintenance and is therefore particularly suitable for fine-machining machines that are permanently in use.

Furthermore, the drive according to the invention is low-vibration, which further simplifies the construction of the fine-machining machine; it can be a relatively simple frame

can be used because it does not have to be suitable for damping or generating vibrations generated by the drive

compensate.

A particularly advantageous structure results when the rotor is arranged on the inside relative to the stator (so-called "inner rotor" configuration). This has the advantage that the radial relative to the rotor

external stator in a simple manner over

stator-side housing with a frame of

Finishing machine can be connected. In addition, the supply of the electrical energy required for the torque motor is simplified. Furthermore, it is possible to supply and remove from the outside radially a cooling medium which serves for cooling the torque motor. Furthermore, it is possible to use a stator-side housing for supplying a machining fluid (in particular an emulsion for cooling and / or lubrication in a working area in which the active surface of the tool is in contact with the workpiece to be machined).

In a particularly preferred embodiment of the

Invention is provided that the rotor and / or a

Rotor housing part bounded by a concentric to the axis of rotation cavity. This is particularly advantageous if the rotor is located inside with respect to the stator

is arranged. The cavity of the rotor or the

Rotor housing parts can be used to arrange other components of the finishing machine. This may be in the simplest case to electrical, pneumatic or hydraulic lines.

It is particularly preferred if in the cavity a

Drive element is arranged for a rotary drive of a rotor disc. Such a carrier becomes the

Positioning of workpieces in a working area of the Finishing machine used. The rotary drive of the rotor disc allows one of a movement of the

Tool's independent way to control a

Movement of one or more workpieces.

Another way to use the cavity of the rotor, is a sensor element, which serves to detect a processing parameter, in the cavity

to arrange. This may, for example, a

Act sensor element, by means of which a material removal, which results from the machining of the workpiece detected. In particular, the ablated layer thickness can be detected, from which then the remaining (residual) thickness of

Workpiece results. It is also conceivable that the

Sensor element other processing parameters (for example, temperature and / or pressure) detected.

Another way to use the cavity of the rotor, is to arrange an assembly in the cavity, which comprises at least one bearing, by means of which the tool and the rotor are rotatably mounted about the axis of rotation on a stator housing. As a result, a cavity of the rotor can be used optimally and a particularly compact drive unit can be provided; in the radially outer environment of the stator creates free space.

In a further preferred embodiment of the

Invention is provided that at least one tool of the finishing machine by means of an axial-radial bearing is mounted on a stator housing part. This makes it possible to provide a tool which is particularly precisely aligned with regard to both its axial position and its radial position, with respect to the axis of rotation. This is particularly advantageous when the finishing machine has multiple tools.

Especially in the event that the

Finishing machine has multiple tools, it is preferred if at least one tool of

Finishing machine is mounted by means of a tapered roller bearing on a stator housing. In this way, a particularly stable and inexpensive storage of a tool is possible. For a tolerance compensation is advantageously provided that between the

Statorgehäuseteil and the tool is provided a compensating element, whereby an inclination of the tool and its effective area at least to a small extent (for example, a maximum of one or two angular degrees)

is changeable. Such a compensation element forms in the context of the present invention, no transmission element;

by a transmission element is rather understood an element by means of which a transfer or reduction or a deflection of a drive movement is realized.

Particular advantages also arise when the effective surface of the tool or the active surfaces of the tools

Finishing machine is or are flat. In the context of the invention, it is possible that the tool is a grinding tool, lapping tool or polishing tool.

Special advantages arise when the

Finishing machine is designed in the form of a double-sided surface grinding machine. Such

Grinding machine has two grinding tools with two mutually facing flat active surfaces that limit a working area. Preferably, a separate drive, in each case in the form of a torque motor, is provided for each of these grinding tools.

Further features and advantages of the invention are the subject of the following description and the drawings

Representation of a preferred embodiment.

In the drawings show:

Fig. 1 is a perspective view of a

Embodiment of a Finishing Machine;

Fig. 2 is a perspective view of a first

Assembly of the finishing machine of FIG. 1; and

Fig. 3 is a perspective view of a second

Assembly of the fine machining machine according to FIG. 1. In the drawing, an embodiment of a finishing machine is shown, which is generally designated by the reference numeral 10. In the

Finishing machine 10 is a

Double side grinding machine. This one has

Machine frame 12, which has a stationary frame member 14 in the form of a cylindrical wall, the

Receiving screws 16 is used, by means of which a first assembly 18 shown in Figure 2 is attached to the frame 12.

The frame 12 also has a reference to the

Direction of gravity vertical guide rail 20, along which a carriage 22 is movable. The carriage 22 has a slide member 24, for example in the form of a

Flange, which is movable together with the carriage 22 along the guide 20 and to which by means of screws 26, a second assembly 28 shown in Figure 3 is attached.

The first assembly 18 has a receiving disc 30 for receiving and cooling for a first, lower

Abrasive tool 32, which is covered with an abrasive layer 34 having a flat active surface 36 of the

Abrasive tool 32 forms.

The second assembly 28 has a receiving disk 38 for receiving and cooling a second, upper grinding tool 40 in a corresponding manner. This one is with one Abrasive layer 42 is provided, which forms a flat active surface 44.

A limited between the mutually parallel active surfaces 36 and 44 working space 46 is used to arrange facing away from each other sides to be sanded workpieces.

For handling the workpieces, a rotor disk 48 is provided, with a workpiece disk 50, in which

Nests 52 are provided for the arrangement of workpieces to be ground. The workpiece disk 50 is supported between an inner ring 54 and a fixed one

Outer ring 56 from. The inner ring 54 is at one

Rotation axis 58 rotatably driven around. A

Rotary movement of the inner ring 54 is on the

Transfer workpiece disc 50, which rolls on the outer rim 56. Characterized in that the nests 52 eccentric with respect to a central axis of the workpiece disc 50

are arranged, move in the nests 52nd

recorded workpieces upon rotation of the workpiece disk 50 along a cycloid trajectory.

A rotary drive of the rotor disc 48 is designated overall by the reference numeral 60. The drive 60 comprises a drive motor 62, a diagrammatically illustrated 90 ° bevel gear 64 and a drive shaft 66, which

concentric with the axis of rotation 58 extends and at its end with a drive pulley 68 for driving the

Inner rim 54 is provided. The drive shaft 66 extends through a cavity 70 which is concentric with the axis of rotation 58 and which is delimited by a rotor housing part 72 (see FIG. 2) which is connected to an electric rotor 74. The

Rotor housing part 72 is arranged by means of radially inwardly disposed screws 76 and by means of radially outside

Screw 78 is connected to a collar part 80 which is also concentric with the axis of rotation 58 and rotates together with the rotor 74 and the rotor housing part 72 about the rotation axis 58.

The collar 80 is further connected to a bearing ring 82 which forms an outer ring of an axial-radial bearing, generally designated by reference numeral 84.

The first assembly 18 further includes a stator base plate 86 which is connected to a hollow cylindrical Statorgehäuseteil 88 which defines an electric stator 90 radially outward.

The electric stator 90 and the stator housing part 88 are connected to each other via another stator housing part 92

connected. At the other Statorgehäuseteil 92, an inner ring 94 of the bearing 84 is arranged.

The electric rotor 74 and the electric stator 90 together form a torque motor 96.

Upon application of electric power to the torque motor 96, the electric rotor 74 rotates together the rotor housing part 72 and the collar part 80, which in turn is connected to a support plate 98, which with the

Recording disc 30 is connected. At this the visible in Figure 1, lower grinding tool 32 is fixed, which is thus offset by means of the torque motor 96 in rotation about the axis 58 around, without further thereto

Gear elements are provided.

For detecting a speed of rotation of the

Grinding tool 32 carries the rotor housing part 72, a total annular index element 100, which cooperates with a (not shown) measuring sensor. The

Measuring sensor is preferably part of the control of the torque motor 96, so that a monitoring and control of

Compliance with a desired speed of the grinding tool is provided.

Hereinafter, the description of the second assembly 28 will be referred to FIG. The assembly 28 comprises a carrier disc 102 for attachment of the receiving disc 38, which in turn is connected to the second grinding tool 40 (see Figure 1). The carrier disk 102 is provided with a

Rotor shaft 104 connected to which inner rings 106 of tapered roller bearings 108 are arranged.

The rotor shaft 104 is connected via a collar disc 110 with an electric rotor 112. The electric rotor 112 cooperates with an electric stator 114. The rotor 112 and the stator 114 together form a torque motor 116. The electric stator 114 is bounded by a

hollow cylindrical Statorgehäuseteil 118, which is connected at its upper end with a cover 120 and at its lower end with a support plate 122.

The support plate 122 is radially outwardly beyond the

Screw 26 connected to the carriage 22. Radial inside is the carrier disk 122 with another

Statorgehäuseteil 124 which carries bearing rings 126 which form the outer rings of the tapered roller bearings 108.

The electric stator 112 defines a cavity 128, which serves for the arrangement of the above-described, with respect to the rotor 112 radially inner components, in particular the bearing 108 and the rotor shaft 104th

The components rotating together with the rotor 112 rotate about a rotation axis 130. This rotation axis is aligned with the rotation axis 58 of the first torque motor 96 of the first assembly 18.

The rotor shaft 104 is hollow. This allows the implementation of a supply line 132 of a

generally designated by the reference numeral 134

Sensor element, which faces the working space 46 and serves to detect a material removal.

The connection between the rotor shaft 104 and the

Carrier disk 102 comprises a compensation element 135 in the form a spherical cap, which enables an angular compensation of the attached to the receiving disk 38 second grinding tool 40. The assemblies 18 and 28 described above form compact drive units for the

Grinding tools 32 and 40. They can be kept as separate assemblies and as

Replacement assembly to be mounted when a torque motor 96 or 116 is to be maintained.

The assembly 18 and 28 each include cooling means 134, 136 for cooling the torque motors 96 and 116, respectively. The cooling means 134 of the torque motor 96 includes a radially inward accessible inlet 138 and an outlet 140. Between the inlet 138 and the outlet 140 a cooling jacket 142 is arranged. The cooling device 136 of the torque motor 116 has an identical structure. Below is an optional cooling

/ Lubricant supply system described the

Working space 46 supplied with lubricant and the

Grinding tools 32 and 40 cools. An inlet of this optional system is formed, for example, by a coolant inlet 144 (see Figure 3) disposed in the carrier disk 122.

From the carrier plate 122, the cooling fluid reaches

Cooling chambers 146 and 148. The refrigerator 146 feeds a Line 150, passes through which cooling fluid into the working space 46 and then from above on the drive pulley 68 of the rotary actuator 60 strikes. From there, the cooling fluid passes through radial bores 152 in the receiving disk 30, so that their cooling channels 154 are supplied. The cooling channels 154 are closable radially on the outside by throttle element 156, so that a fluid flow of the cooling fluid is controllable.

The second cooling chamber 148 (see FIG. 3) feeds corresponding cooling channels 158 of the receiving disk 38. Throttling elements 160 are also provided there for controlling a fluid flow.

Claims

claims

Finishing machine (10), comprising a tool having a rotating effective surface (36, 44) for machining a workpiece, wherein for the

Rotary drive of the tool, a drive is provided which drives the tool about a to the active surface (36, 44) perpendicular axis of rotation (58, 130), characterized in that the drive in the form of a torque motor (96, 116) is formed, a stator (74, 112) and a rotor (90, 114), wherein the rotor (90, 114) is connected without the interposition of other transmission elements with the tool and the tool about the rotation axis (58, 130) drives.

Finishing machine (10) according to claim 1, characterized in that the rotor (90, 114) relative to the stator (74, 112) is arranged on the inside.

Finishing machine (10) according to claim 1 or 2, characterized in that the rotor (90, 114) and / or a rotor housing part (72) has a for

Rotation axis (58, 130) concentric cavity (70, 128) bounded.

Finishing machine (10) according to claim 3, characterized in that in the cavity (70, 128) a drive element (66) for a rotary drive (60) of a rotor disc (48) is arranged.

5. Finishing machine (10) according to claim 3 or 4, characterized in that in the cavity (70, 128), a sensor element (134) for detecting a

Finishing parameters is arranged.

6. Finishing machine (10) according to one of claims 3 to 5, characterized in that in the cavity (70, 128) a bearing (84, 108) is arranged, by means of which the tool and the rotor to the

Rotation axis (58, 130) rotatable on one

Statorgehäuseteil (92, 124) are mounted.

7. Finishing machine (10) according to one of

preceding claims, characterized in that at least one tool of the finishing machine (10) by means of an axial-radial bearing (84) on a stator housing part (92) is mounted.

8. Finishing machine (10) according to one of

preceding claims, characterized in that at least one tool of the finishing machine (10) by means of a tapered roller bearing (108) on a stator housing part (124) is mounted.

9. Finishing machine (10) according to one of

preceding claims, characterized in that the active surface (36, 44) is flat.

10. Finishing machine (10) according to one of

preceding claims, characterized in that the tool comprises a grinding tool (32, 40),

Lapping or polishing tool is.

11. Finishing machine (10) according to one of claims 1 to 9, characterized in that the

Finishing machine (10) in the form of a

Double-sided surface grinding machine is formed.