Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B37/00—Lapping machines or devices; Accessories
  • B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
  • B24B37/07—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool
  • B24B37/08—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for double side lapping
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B37/00—Lapping machines or devices; Accessories
  • B24B37/005—Control means for lapping machines or devices
  • B24B37/013—Devices or means for detecting lapping completion

Definitions

• the invention relates to a method for controlling the Operation of, in particular, two-disc honing or grinding machines according to the preamble of claim 1.
• the workpieces are nor sometimes taken in the receiving openings of the carrier disks, which rest on the lower working disk and their circumferential number tion with an inner and an outer ring gear engaged stands. Outer or inner ring gear or both are driven ben, so that the carriers rotating about their axis between move the working disks forward.
• the receiving openings for the Workpieces are eccentric, so that the workpieces in the perform a cycloidal movement as described.
• the invention is therefore based on the object of a Ver drive to control the operation of two-disc honing and grinding machines to specify with which the machining time of the workpieces can be optimized with improved Tolerance and surface quality with simplified dimensions machine operation
• the material is removed measured per unit of time and with a predetermined target value for the material removal per unit of time compared.
• the Change in thickness of the workpiece per time measured and in Be drawing set to a given change in thickness per time If the measured material removal per time is reached unit does not reach the specified value, this is an indication for the decrease in the grip of the working disks. It it is therefore necessary to increase the loading pressure. This happens automatically in the method according to the invention.
• the method according to the invention a maximum and a minimum setpoint for the mate rial removal per unit of time.
• the loading pressure is increased if the measured material removal per time unit is below the minimum setpoint and he low when it is above the maximum setpoint, for example if the working disks break open. In this way it is ensured that the load pressure is neither too high nor too low to be optimal To carry out workpiece machining.
• the size the change in loading pressure from the size of the Ab deviation of the actual value from the target value for the material removal to make dependent per unit of time.
• the control for the A function can be stored, which is the relationship of the loading pressure to the measured Ma expresses material removal per unit of time. A certain one The value of the removal per unit of time corresponds to a certain th loading pressure. If the material removal changes, it changes the pressure of the load increases accordingly. This can who changes continuously or in predetermined steps the.
• the working machine preferably switched off when the loading pressure is a has reached the specified height.
• the quality of the work is no longer necessarily guaranteed steadily
• the method according to the invention is before seen when reaching the maximum setpoint for the To emit an alarm signal per unit of time. Exceeding this setpoint indicates that the Ar can break open and possibly an impermissible Get grip, which for quality reasons is also un is desirable.
• the Thickness of the workpieces after removal from the machine is remeasured and from the difference of the remeasured Value and the specified setpoint a correction signal is formed to modify the specified setpoint for material removal.
• the shutdown can also be used time of the machine after reaching the specified Setpoint for the material removal can be shifted.
• an Off design of the invention expediently a plurality based on final measurement values, from which a mean value is formed.
• an electronic Measurement control device provided which has a programmable Contains memory in which at least one setpoint for the Material removal per unit of time and for the absolute mate rial ablation can be entered. It also contains a time Clock generator for measuring the material removal per unit of time.
• the probe is connected to the measurement control device for the input of a measured material removal value corresponding signal.
• the measurement control device is with connected to a pressure control device, the dependent of the signal from the control device the load pressure changes.
• the pressure control device expediently has also a programmable memory for default a maximum setpoint for the load pressure. She gives a signal to a cut-off device for the Häma machine when the one to be applied by the printing device Load pressure reaches or exceeds the setpoint. As mentioned, by limiting the loading pressure prevents that the surface quality suffers or a causes uncontrolled breaking of the working disks becomes.
• the sensor is according to one embodiment of the invention a probe to which limit switching points are assigned for a minimum or maximum measuring path limitation. This will prevents the measurement from becoming too inaccurate.
• the signals the limit switches are preferably on the measuring control direction given, according to an embodiment of the inventor the switch-off device of the machine or a warning lamp actuated when it receives a signal from a limit switch receives.
• the re-measuring sensor is with the measurement control device connected to modify the Setpoint for the material removal of the workpiece or the Shutdown time of the machine after reaching a before given target value for the material removal.
• the work pieces are preferably with the help of a suitable handler device automatically removed from the machine and the Re-measuring station supplied.
• the single figure shows schematically a honing or grinding machine with a control arrangement according to the invention.
• a two-disc honing or grinding machine 10 has a upper working disk 11 and a lower working disk 12 on.
• the upper working disk 11 is on a spindle 13 suspended, on the upper end of which a drive wheel 14 sits, which has a drive belt 15 from a drive motor 16 is driven.
• the spindle 13 is in a Bearing bush 14 stored on the example of a Linkage 17 acts on a loading device 18. With With the help of the loading device 18, the loading pressure the working disk 11 can be set.
• the described Parts are stored in an upper part 19, which is around a ver vertical axis in the machine frame 20 is pivotally mounted.
• the lower working disk 12 is by means of a hollow shaft 21 rotatably mounted in the machine frame 20.
• the hollow shaft 21 is via a drive belt 22 from an electric motor 23 driven.
• the lower working disk 12 is surrounded by a stationary pin ring 24.
• Within the annular lower working disk 12 is a plate 25 arranged, which via a shaft 26 in the hollow shaft 21 is mounted and connected via a belt gear 27 with an electric motor 28 is available.
• the plate 25 has a Pin rim 29 on.
• the lower working disk 12 is supported by several Läu ferusionn 30 arranged on the circumference with a toothing which is in engagement with the inner pin wreath 29 and the outer pin wreath 24.
• the carriers 30 take workpieces 31 in openings, the top and Subpages should be edited.
• the working disks 11, 12 preferably rotate in opposite directions fig. Furthermore, the plate 25 is driven, whereby the Workpieces in the carriers 30 are cycloid between between the working disks 11, 12 move. To that extent acts it is a conventional honing or grinding machine.
• a measuring surface 32 On the plate 25 is a measuring surface 32, which is a Probe 33 is assigned.
• the probe 33 is with the upper working disk 11 connected and therefore measures the Ab stood the working disk 11 from the stationary measuring surface 32. This distance depends on the thickness of the work pieces 31. However, it is also influenced by the removal the working surfaces of the upper and lower working disks 11, 12.
• the probe 33 is connected to a measuring control device 35 via an electrical line 34.
• the measuring control device contains a programmable memory in which the values for a maximum material removal per time unit (/ t max) and a minimum material removal per time unit (/ t min) are given.
• the measuring control device 35 is connected to a clock generator, not shown, which gives the time pulses within the measuring control device (t).
• the values for a maximum and a minimum total material removal or measuring range (max and min) are also entered in the programmable memory.
• the measuring control device 35 is connected via a line 36 to a pressure control device 37 which is connected via a control line 38 to the loading device 18 in Ver.
• the pressure control device 37 controls the pressure of a pressure medium arriving via a line 39, which is applied to the loading device 18 via the line 38 (inlet pressure F; outlet pressure F B ).
• the pressure control device also contains a programmable memory in which a maximum value for the differential pressure (/ Fmax) for an increase in load and a mini painter differential pressure value (/ Fmin) for a load reduction are stored.
• a re-measuring station 40 has two probes 41, their signals via a line 42 to the measuring control device 35 against be practiced.
• the workpieces 38 are not with the help of a automatically operating handling device shown removed from the machine 10 and into the re-measuring station 40 given.
• the arrangement described works as follows. Workpieces specified during machining are entered into the measuring control device in the manner described above, the values for the maximum and the minimum removal per unit of time, as well as the absolute values for the upper and lower measuring range.
• the probe 33 continuously or at time intervals sends a signal to the measuring control device 35 which is proportional to the thickness measured in each case.
• the measuring control device now compares the amounts of the contract from within a predetermined period set by the clock generator. If the determined value is between the maximum and the minimum removal value per unit of time, operation is continued with the same load pressure. This was started with a certain pressure F B for the upper working disk 11, which is set by the pressure control device 37 via the loading device 18.
• the coming from the machine work pieces 31 are automatically removed with the help of a handling device and fed to the re-measuring station 40.
• the thickness of the workpieces 31 is measured again, this measurement signal being passed into the measurement control device 35 via the line 42.
• the setpoint value stored in the measuring control device 35 for the workpiece thickness is modified accordingly, so that the removal of the work wheel is compensated for in this way.
• the pressure may only assume a maximum value if it should not lead to an uncontrollable break open of the working disk. In addition, too much pressure would affect the quality of the surfaces. Therefore, if a predetermined upper pressure is reached, the machine is shut down. The working disks 11, 12 must be reworked. Naturally, a probe works relatively accurately only within a certain range. In order to maintain the accuracy range, switching points (max, min), not shown, are assigned to the measuring probe 34, which ensure that the machine 10 is switched off or that a warning signal is issued when the upper or lower limit of the range is reached.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Applications Claiming Priority (2)

Publications (2)

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Citations (6)

Family Cites Families (5)

• 1988
  • 1988-05-28 DE DE3818159A patent/DE3818159A1/de active Granted
• 1989
  • 1989-05-19 EP EP89109076A patent/EP0344548A3/de not_active Withdrawn
  • 1989-05-22 US US07/355,030 patent/US4962616A/en not_active Expired - Fee Related

Patent Citations (6)

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