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Automatic Cam Machining and Inspection Apparatus and Method

IP.com Disclosure Number: IPCOM000046156D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 64K

Publishing Venue

IBM

Related People

Birdsall, IP: AUTHOR [+5]

Abstract

Cam blanks are automatically and accurately positioned for cutting and the cutting product is dynamically measured by a cam-following structure associated with the cutting operation.

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Automatic Cam Machining and Inspection Apparatus and Method

Cam blanks are automatically and accurately positioned for cutting and the cutting product is dynamically measured by a cam-following structure associated with the cutting operation.

Main machine plate 10 (Fig. 1) physically mounts a stepper drive motor 11 coupled via cable 12 to a computer control output. A cam- rotating collar housing 15 (shown in greater detail in Fig. 2) receives cutting blade drive power from belt 16. Cam blank 20, formed by a process such as progressive piercing, blanking and shaving dies, is fed (by means not shown) into approximate position under the spindle associated with collar 15. Previous processing of blank 20 further includes deburring and inserting of blank 20 in an injection plastic mold device for the molding of timing belt pulley and plastic molded flange which are ultrasonically staked as a secondary operation. The molded cam insert is then placed on a fixture located from the previouslymachined identification bore (note 21 of Fig. 2) on the spring collet locator of Fig. 2 with the timing hole 21, also previously machined, associated with a diamond pin (not shown). The fixture is mounted on a rotary stage mounted on a linear stage. The cam profile machining process is totally automated by placing the molded cams after prior machining in an egg-crate container. The container or tray is presented to an X-Y index table.

A mechanical arm retrieves the cam from the egg crate and places it on the locator in the cutting fixture. The fixture is one of two at each station using a shuttle concept, whereas one fixture is in position for cutting while the other is shuttled either right or left or for load/unload/clean processes.

The cam profile cutting is by known devices, such as polished two fluted carbide or high-speed steel end mills mounted in a high-speed spindle. The cam index is radially on its centerline driven by a servo controlled DC motor or motors with a counting device read out for speed control and controls for the table for linear and radial motion. The table movement is controlled by a programmable microprocessor or the like that allows the cam insert to index radially and with linear control. Using this technique, a micrometer head 25, associated with a cam follower 26, is slidable by air piston 28 in response to pneumatic input 29 to engage the edge of cam blank 20. Thus, output 30 to the computer provides inspection data on the machined surface and relays that information to the microprocessor so that the linear stage is automatically adjusted either dynamically during the cutting operation to compensate for errors in dimensions due to cutter wear, or to correct subsequent programming for subsequent cam cutting. The inspection function can be performed subsequent to machining and in a separate fixture, if desired. Upon completion of the machining cycle, the table shuttles to either side and the finished cam is again placed into...