JPS6315095B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a continuous multi-tasking machine tool capable of continuously performing milling and broaching.

(Conventional technology) Conventionally, among the numerous surface treatments in mass production processes, those that require high precision or compatibility are generally processed using broaches alone, and in very exceptional cases, broaches are used. There are two types of broaching: milling is performed in a separate process as a pre-processing process, and then broaching is performed.

(Problems to be Solved by the Invention) In such conventional techniques, depending on the size of the machining allowance and the rigidity of the workpiece, there are unreasonable aspects such as the broach becoming longer and the number of steps increasing. Seen a lot. Further, even in continuous broaching, which is advantageous for broaching small items, the above-mentioned drawbacks cannot be avoided.

In an attempt to solve this problem, for example, Japanese Patent Application Laid-Open No. 50-41184 proposes that multi-step milling and subsequent rough grinding and finishing grinding, which had previously been performed by separate machines for each step, were A system has been disclosed in which machines are assembled in one line and workpieces are fed into the line one by one to sequentially process each process in assembly line operation. A combination of different types of processing, such as combining the above-mentioned milling process with milling and broaching, is simply a process that has been made continuous in terms of operation, and the processes within it are combined with other more efficient processing processes, such as combining the milling process with milling and broaching. There is no disclosure or provision for separate feed rates for each milling and grinding operation. For example, Japanese Patent Application Laid-Open No. 50-66892 discloses a well-known continuous broaching machine, and in particular a slide lubrication method for a large number of workpieces mounted on a continuous chain. There is nothing disclosed that suggests combinations of different types of machining such as, and separate feed rates for each step.

It is an object of the present invention to provide a multi-purpose machine tool which eliminates the drawbacks of conventional products, is small and lightweight, can process workpieces with large machining allowances or are easily deformed with a short broach, and has a small number of steps. .

(Means for Solving the Problems) Therefore, the present invention replaces part of the broaching process using a continuous broaching machine with milling process, and performs different types of machining such as rotary cutting milling process and linear cutting broaching process, which were completely unthinkable in the past. This is an innovative method that allows each machining process to be performed on the same cutting motion line using a single machine by giving a separate feed rate to each machining process. That is, one or more milling cutters and broaches are arranged and fixed on the same cutting motion line, and a continuous feed mechanism provides separate cutting speeds depending on the cutting process. High-efficiency machining is possible by feeding the workpiece in the cutting direction and performing continuous machining while providing a slow cutting speed and a fast cutting speed for broach machining.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. A driving wheel 2 and a driven wheel 3, which are chain wheels, are provided on the main body 1 on the left and right sides in FIGS. 2 and 3, and a pair of endless chains 4 and 5 are mounted thereon. Further, a plurality of workpiece fixtures 6 are arranged at equal intervals on the chains 4 and 5. An electric motor 21 with a reduction gear is directly connected to the drive wheels 2.

On the other hand, in the vicinity of the driven wheel 3, a clamping device 8 clamps the workpiece 7 as soon as it is inserted.
However, in the vicinity of the driving wheels 2, unclamping devices 9 are provided for unclamping the workpieces that have been machined. In addition, the milling spindle head 10 for the previous process
is placed on the main body 1, and rotation is transmitted from the electric motor 11 to the milling cutter 13 attached to the main shaft 12. Furthermore, a broach holder 1 is fixed with a broach 14 for final finishing in the next process.
5 is fixed on the main body 1 in a tunnel state along the driving direction of the chain. In addition, 16 is an operation box, 18 is a cutting oil pump, 19 is a chip conveyor,
20 is a device for attaching and detaching the workpiece 7.

First, the workpiece 7 is loaded into the fixture 6 automatically or manually by the workpiece attachment/detachment device 20 . Next, the workpiece 7 loaded into the fixture 6 is automatically clamped to the fixture 6 by a wedge-type workpiece clamping device 8 . Subsequently, the first step is entered, in which milling is performed by the milling cutter 13 at a slow cutting speed. When the milling of the workpiece is completed by the finishing broach 14 at a fast cutting speed, the workpiece 7 is unclamped by the unclamping device 9. Of course, the unclamped workpiece 7 can be taken out backwards or returned to the operator's side and taken out.

(Effects of the Invention) As explained above, the present invention replaces all broaching by a continuous broaching machine with milling, and performs different types of machining such as rotary milling and linear broaching in one machine. Since each process is performed on the line of motion at a separate feed rate, the overall size and rigidity of the entire device are reduced to approximately 1/4 or less compared to a continuous broaching machine. For example, if a continuous broaching machine requires a broach with a pulling force of 25 tons and a stroke of 4,500 mm, the compound machine of the present invention can perform the process with a broach with a pulling force of 2.5 tons and a stroke of 1,000 mm. The length of the broach was reduced to 1/5 to 1/10, and the rigidity and weight of the machine were also significantly reduced. Generally, in the case of broaching, the cutting load is greatest in rough machining, and finishing machining requires almost no load, ie, feeding force. Furthermore, in the case of milling, the feeding force is about 1/10th that of finishing with a broach.
Therefore, in the composite machine tool of the present invention in which rough machining is performed by milling and finishing machining is performed by broaching, the machine rigidity can be reduced to 1/10 or less of that in the case of full broaching, and the machine weight of the broached part can be reduced accordingly. In addition, this multi-tasking machine tool can machine the workpiece in one chuck, which reduces machining time compared to milling and broaching in separate processes. Since the load is reduced, even workpieces that have a large machining allowance or are easily deformed and cannot withstand the rough machining load of the broach can be processed with a short broach and with a reduced number of steps. Note that since the machining allowance by the milling cutter can be increased and the finishing allowance by the broach can be reduced, a shorter broach can be used, and the machine can be made more compact. Further, since the workpiece fixtures are disposed at equal intervals on a chain endlessly mounted on the drive wheel and the driven wheel and move in a fixed direction, there is no returning process, resulting in high efficiency. In addition, since the machine is compact, it takes up little space for installation and can be easily moved, which brings about remarkable effects.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a schematic diagram of the internal structure of FIG. 2. 2... Drive wheel, 3... Driven wheel, 4, 5... Chain, 6... Workpiece fixture, 10... Milling spindle head, 11... Electric motor, 12... Main shaft, 13...
Milling cutter, 14...Broach, 15...Broach holder, 21...Electric motor with reducer.

Claims (1)

[Claims] 1. A chain is mounted endlessly on a driving wheel and a driven shaft, and a plurality of workpiece fixtures are arranged on the chain, and a milling spindle head and a milling spindle head are connected to the same cutting motion line along the driving direction of the chain. A multifunctional machine tool characterized in that a broach holder is mounted and a drive wheel is driven to provide a separate cutting speed depending on the cutting process to perform continuous machining.