CONTROL OVER CROSS FEED AT IN-FEED GRINDING AT ROTARY AND INTERNAL GRINDERS WITH NUMERICAL PROGRAMME CONTROL BY SIZE INSTRUCTIONS OF ACTIVE CONTROL DEVICE Russian patent published in 2015 - IPC B24B51/00 

FIELD: process engineering.

SUBSTANCE: invention relates to automatic control over grinding at NC machine tools. Known are active control devices (ACD) incorporated with rotary and internal grinders for cross feed at in-feed grinding including roughing and finishing as well as dead-stop grinding to sizes and application of processing mode change instructions. Most cases include forced feed of grinding wheel to the part and removal of machining allowance. Grinding final stage consists in dead-stop grinding while removal of allowance is executed at straining of the part or grinding wheel arbour (at internal grinder) occurred at previous step cutting. Roughing and finishing are performed by include forced feed of grinding wheel to the part and removal of machining allowance. Grinding final stage consists in dead-stop grinding while removal of allowance is executed at straining of the part or grinding wheel arbour (at internal grinder) occurred at previous step cutting. Deficiency in said processes consists in that the difference in grinding feed rate and actual rate of removal of allowance varies because of changes of allowance and other reasons. This causes accelerated removal of allowance (freeze-in) or insufficient removal of allowance (licking), that is, loss in efficiency and precision. Allowance removal rate V_c (or allowance removal in one or several revolutions of machined part) is continuously measured at all grinding steps. Simultaneously, grinding wheel feed rate values V_f are loaded to ACD from machine tool NC unit for time interval wherein allowance removal rate V_c is measured. Said ACD unit subtracts obtained actual rate at preset sections Δ_i=V_n-V_c from feed rate. This difference Δ_i describes the cutting force or straining in the machine-appliance-tool-part system. In case difference in rates Δ_i differs from preset value Δ_preset said ACD unit feeds an appropriate control instruction o machine tool NC unit. Said allowance removal rate V_c is set at all grinding steps before machining and memorized of ACD unit in compliance with selected grinding mode.

EFFECT: higher efficiency and precision.

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