Special high-precision arc channel composite milling machine for bell housing

Abstract

The invention discloses a special high-precision arc channel composite milling machine for a bell housing, and belongs to the technical field of milling machines, a clamping device comprises a spring chuck, a hydraulic indexing tool turret, an extension seat, a tool turret seat, a transmission rod, an arc rotating table and a driving mechanism, the arc rotating table is fixedly installed on a workbench, and the transmission rod is installed in the arc rotating table in a transmission mode; the tool turret base is fixedly installed at the upper end of the transmission rod, the extension base is integrally formed on one side of the tool turret base, the hydraulic indexing tool turret is fixedly installed on the extension base, the spring chuck is installed on the hydraulic indexing tool turret, and the driving mechanism is fixedly installed at the lower end of the arc rotating table. The transmission rod is driven by the driving mechanism to do reciprocating rotation motion so as to drive the spring chuck to do reciprocating arc track motion on the horizontal plane, and the effects of being simple and ingenious in structure, long in service life, stable in cutter cutting, high in machining precision, low in energy consumption, low in cost, capable of machining double arc channels at a time and high in machining efficiency are achieved.

Description

technical field [0001] The invention relates to the field of milling machines, in particular to a high-precision arc groove compound milling machine dedicated to bell-shaped shells. Background technique [0002] Milling machines mainly refer to machine tools that use milling cutters to process various surfaces of workpieces. Usually, the milling cutter is dominated by rotational motion, and the movement of the workpiece and the milling cutter is the feed motion. It can process planes, grooves, various curved surfaces, gears, etc. [0003] At present, there is an urgent need to correct the part named bell shell in the constant velocity joint (refer to figure 1 shown) to process multiple double-arc grooves. The current processing method is divided into two steps. The first step is to process multiple first-layer arc grooves (A), and the second step is to replace the bell shell. Go to another milling machine to process a plurality of second heavy arc grooves (B), wherein the...

AI Technical Summary

Problems solved by technology

[0004] For example, the patent number is: 2019105249032, which is a Chinese invention patent for a fully automatic inverted direct push ball cage groove special milling machine. The sliding seat is equipped with a workpiece spindle. The workpiece spindle adopts a high-speed torque-type electric spindle with a clamp at the end, a rotary table on the front side of the bed, and a swing shaft on the rotary table. There is a slide rail at the end, a slide table is installed on the slide rail, a linear motor drive is installed inside the slide table, a tool electric spindle is installed on the slide table, a loading machine and an unloading machine are installed behind the bed, and a There are workpiece grabbing manipulators and workpiece transporting manipulators arranged vertically; the above invention can complete the milling of multiple grooves with any inclination of the constant velocity universal joint ball cage in one clamping, but this milling machine has the following disadvantages: 1 , The tool swings to the set angle through the swing shaft of the rotary table, but because the swing shaft is placed horizontally, and the end of the swing shaft is provided with a linear slide rail, the slide table is installed on the linear slide rail, and the inside of the slide table It is driven by a linear motor, and the tool electric spindle is installed on the slide table, which is equivalent to the swing axis bearing the weight of the linear slide rail, slide table, linear motor drive and tool electric spindle, as well as the cutting tool and constant velocity universal joint ball cage. The reaction force of the cutting force during the feed movement, under the pressure accumulated over time, the center line of the swing shaft is bound to be locally bent or deformed, or even broken, which will lead to changes in the position of the tool motorized spindle, which in turn will cause the machined groove Deviations will affect the product accuracy, and more seriously, it will cause equipment damage; 2. The tool can swing to the set angle through the swing axis of the rotary table, and then the linear motor drives the slide table to drive the tool electric spindle to realize oblique milling. By setting the swing angle, grooves with any slope can be processed. From this technology, it can be directly obtained that: this technology can process linear grooves with any slope. If this is the case, the swing axis of the rotary table needs to be in a constantly swinging position, and the slide table is continuously reciprocating up and down on the linear slide rail to perform feed motion, which has the following disadvantages: ①. The tool electric spindle is fixed on the slide table, and the slide table and The linear slide rail is slidingly connected, the linear slide rail is fixed on the swing shaft, and the swing shaft is rotationally connected with the rotary table, and the position accuracy of the tool electric spindle cannot be guaranteed due to multiple movable connections

②. This technology is similar to the traditional solution. During the process of machining the groove, the tool is performing both the main movement and the feed movement, and the position of the workpiece does not change, so as to achieve cutting of the workpiece, which in turn causes the tool to vibrate and shake easily

3. Since the swing axis bears the weight of the linear slide rail, slide table, linear motor drive and tool electric spindle, as well as the reaction force of the cutting force during the cutting feed movement of the tool and the constant velocity universal joint ball cage, the swing will be relatively large. It is laborious, and it is even more difficult to do a coherent circular arc movement. At the same time, the power requirements for the driving components are very large, and the energy consumption is also large.

4. There is only one tool electric spindle, so it is impossible to process the above-mentioned double arc groove at one time. If all the processing cannot be completed by one milling machine, the position is easy to shift after the second clamping, and then Causes the relative position between the second arc channel (B) and the first arc channel (A) to change, affecting the machining accuracy

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