JPH02145207A - Broaching tool exchange method and exchanger for broaching machine - Google Patents

Abstract

PURPOSE:To exchange in a short time and at a time a plurality of broaching tools processing the same shaped parts of a work, by dividing each of the broaching tools into a plurality of holders circumferentially, and making exchanges at a broach holder group unit at the circumferentially same parts. CONSTITUTION:In the case of the segment 28a being exchanged out of the segments 28a-28e of broaching tools 50-54, an agreement with a long hole is done by turning the T bolt 33 of a holder 26a for respective broaching tools 50-54. Next, a clamp jig 40 is suspended and engaging claws 65 are made to agree with horizontally pinch-holding holes 36 at both ends of a broach holder group and a handle 45 is rotated and operation members 60,61 are neared and engaging claws 65 are inserted into pinch-holding holes 36 and the holder 26a is pinchingly held. When the clamp jig 40 is ascended, the T bolt 33 comes off the long hole and a rotary shaft 23 and the holder 26a come off, and a new holder 26a is pinchingly held at the clamp jig 40 and the T bolt is putin to the long hole and turned, and the exchange of tools is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a broach tool changing method and a broaching device for a broaching machine that can simultaneously change a plurality of broach tools.

<Prior art> Conventionally, in order to process multiple parts of the same shape on a workpiece at the same time, a broaching machine equipped with multiple broaching tools has the broaching tools individually fixed to a tool stand with a large number of bolts and keyed. The thrust is supported by etc.

<Problems to be Solved by the Invention> With such fixation of the broach tools, each broach tool must be replaced individually, resulting in a problem of poor work efficiency.

Means for Solving the Problems> The present invention has been made to solve the above-mentioned problems. (1) Each of the broach tools is divided into a plurality of holders in the circumferential direction, and the This is a method for exchanging broach tools in which groups of broach holders at the same location are exchanged.

(2) Each of the broach tools is divided into a plurality of holders in the circumferential direction, and the holders at the same circumference of each broach tool are combined to form a broach holder group, and this broach holder group is connected from both ends. This is a broach tool changing device equipped with a tool clamp jig that clamps the tool and attaches and detaches it from the rotating shaft.

Function> In order to carry out the present invention as described above, the holders at the same circumference of each broach tool are made removable, and then the broach holder group is removed from the rotating shaft.

Next, a new broach holder group is installed in the same way, and each broach tool is replaced at the same time.

The tool clamp jig described above attaches and detaches the broach holder group from the rotating shaft by holding and lifting the broach holder group from both ends.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a broaching machine for machining the journal portion of an automobile crankshaft, and numeral 10 indicates a bed. bed l
A pair of machining shaft heads 11 are disposed above O, and a main shaft 12 is rotatably supported on the machining shaft heads 11.
2 are connected to each other by a synchronized shaft of the circuit and are driven by a drive motor 16 via a belt 15. A chuck 13 is attached to one end of the main shaft 12 on opposite sides of the machining shaft head 11, and both ends of a crankshaft W, which is a workpiece, are attached to this chuck.

A tool stand 20 is arranged behind the machining shaft head 11. This tool stand 20 has a structure in which a rotation shaft 23 is rotatably coupled between a tool spindle head 21 and a support shaft head 22 in parallel to the rotation axis of the crankshaft W. A drive motor 19 is attached to the tool spindle head 21 and drives the rotary shaft 23 to rotate via a speed reduction mechanism 24 . A plurality of broach tools 50 to 54 are arranged in parallel on the rotating shaft 23 (in this embodiment, 5 broach tools are arranged in parallel).
set) is installed. These broach tools 50 to 54 are attached to the outer periphery of the rotating shaft 23, as shown in FIG.
A missing portion 29 is formed at one location on the circumference for positioning the crankshaft W at the start of machining, and has holders 26a to 26e and a cutting blade 27 divided into holders 26a to 26e (divided into 5 in this embodiment) on the circumference. It is composed of segments 28a to 28e. Each of the holders 26a to 26e has a rotating shaft 2.
A key groove 30 is formed in the radial direction and the axial direction of the rotating shaft 23, and is fitted with a key portion 31 formed on the rotating shaft 23 to determine the position in the radial direction and the axial direction. and each broach tool 5
The holders 26a to 26e of the same processing portions 0 to 54 are connected to each other with bolts 35 to form a broach holder group. Elongated holes 32 are formed in the holders 26a to 26e. A T-bolt 33 is inserted into the elongated hole 32, screwed onto the rotating shaft 23, and the head is inserted into the elongated hole 3 by turning the T-bolt 33.
2, the reholders 26a to 26e are removed from the rotating shaft 23, and the elongated hole 32 and the head of the T bolt 33 are shifted in the circumferential direction, thereby removing the holders 26a to 26e.
is attached to the rotating shaft 23.

The segments 28a to 28e perform preliminary cutting of the crankshaft W by the segment 28a, and the segment l-28
Processing and finishing of the journal portion are performed in steps b to 28e. The diameter of the segments 28b to 28e gradually increases, and machining of the crankshaft is completed while the rotating shaft 23 rotates once.

Elongated holding holes 3 are provided on the sides of the segments 28a to 28e.
6 is formed. As shown in FIGS. 4 and 5, the segments 28a to 54 of the broach tools 50 and 54 are located at both ends of the broach tools 50 to 54 that constitute the broach holder group.
28e (shown as segment 28a in FIGS. 4 and 5)
The engaging claw 65 of the tool clamp jig 40 engages with the clamping hole 36 .

This tool clamp jig 40 has brackets 43 fixed to both ends of a frame 42 to which eye bolts 41 on which a hoist or the like is hung are screwed. An operating shaft 44 is rotatably supported on the bracket 43, and a handle 45 is attached to one end of the operating shaft. A large diameter portion 46 is formed at the center of the operating shaft 44, and this large diameter portion 46 passes through the interior of a support member 47 fixed to the frame 42.

At both ends of the operating shaft 44, there are screws 48° and 49 in opposite directions.
is formed. This screw 48, 49 has an actuating member 6.
0.61 is screwed together, and furthermore, this actuating member 60.61 has a guide groove 63 in a guide rail 62 formed on the frame 42.
are slidably engaged with each other. This actuating member 60.
A clamping arm 64 extending downward is fixed to 61, and the engaging claw 65 is attached to the lower end of this clamping arm 64.

With the above configuration, the processing operation of the broaching machine will first be explained.

By driving the drive motor 16, the main shaft 12 is rotated, and the crankshaft W attached to the chuck 13 is rotated. At this time, the crankshaft W rotates at the missing portion 29 of the broach tools 50 to 54. In this state, the drive motor 19 is driven to rotate the rotating shaft 23, and the broach tools 50 to 54 are
Rotate.

At this time, the diameter of the broach tool gradually increases, so
A cut is gradually made on the crankshaft W, and the machining is completed when the broach tools 50 to 54 rotate once.

Next, the operation when exchanging the broach tools 50 to 54 will be explained. First, segment 2 of broach tool 50-54
When replacing a segment to be replaced, for example, segment 28a among 8a to 28e, each broach tool 50
Turn the T-bolt 33 of the holder 26a of ~54 and insert it into the elongated hole 32.
Combine with.

In this state, the eye and bolt 41 of the tool clamp jig 40 are hung with the hook of a lifting device such as a hoist to lift the tool clamp jig 40. Next, the tool clamp jig is lowered so that the engaging claws 65 are horizontally aligned with the clamping holes 36 of the broach tools 50 and 54 at both ends of the broach holder group, and the handle 45 is rotated clockwise to close the actuating member 60. .61 in the approaching direction and insert the engaging claw 65 into the holding hole 36. Then, the handle 45 is further rotated clockwise to clamp the holders 26a of the broach tools 50 to 54.

When the tool clamp jig 40 is raised from this state, the T-bolt 33 comes off from the elongated hole 32, and the rotating shaft 23 and holder 26
a comes off. After this, remove this holder 26a from the tool clamp jig 40, hold the new holder 26a in the tool clamp jig 40, fit the T bolt 33 into the elongated hole 32, and turn the T bolt 33 to complete the tool exchange. do.

Further, in the above embodiment, the tool clamp jig 40 holds the holders 26a to 26 of the same portions of the broach tools 50 to 54.
The tools were exchanged by holding the tool e, but instead of using the tool clamping jig 40, the holders 26a to 26e may be replaced manually by holding the holding hole 36 and removing the holders 26a to 26e from the rotating shaft 23. .

<Effects of the Invention> As described above, in the present invention, each of the broach tools is divided into a plurality of holders in the circumferential direction, and each broach tool is replaced in units of groups of broach holders at the same circumferential location. Therefore, a plurality of broach tools for machining the same shaped part of a workpiece can be replaced at once, which has the advantage of shortening the time required for tool replacement and improving work efficiency.

In addition, if the broach holders at the same location on the circumference of each broach tool are attached and detached from the rotating shaft using a tool clamp jig that clamps them from both ends, work efficiency can be further improved and worker safety can be improved. There are advantages that can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a plan view of the broaching machine, Fig. 2 is a side view of the broaching tool, Fig. 3 is an enlarged view of the main parts of the holder, and Fig. 4 is a tool clamp jig. A front view of the tool, and FIG. 5 is a side view of the tool clamp jig. DESCRIPTION OF SYMBOLS 10... Bed, 11... Processing shaft head, 20... Processing stand, 23... Rotating shaft, 26a-26e... Holder, 28a-28e... Segment, 32... Long hole, 33... T bolt, 36... clamping hole, 40...
Tool clamp jig, 65...engaging claw.

Claims (2)

[Claims] (1) A machining shaft head that rotatably supports a cylindrical workpiece and rotates this workpiece by a drive device, and a rotation shaft parallel to the rotation axis of this workpiece, and the circumference of this rotation shaft is A broaching machine in which a plurality of broaching tools are removably fixed, make cuts in a workpiece in a direction perpendicular to the rotational axis of the workpiece, and process a plurality of shaped parts of the cylindrical workpiece at the same time. A broaching tool replacement method for a broaching machine, wherein each of the broaching tools is divided into a plurality of holders in the circumferential direction, and each broaching tool is replaced in units of groups of broach holders at the same location on the circumference. (2) A machining shaft head that rotatably supports a cylindrical workpiece and rotates this workpiece by a drive device, and a rotating shaft parallel to the rotational axis of this workpiece, and the circumference of this rotating shaft is A broaching machine in which a plurality of broaching tools are removably fixed, make cuts in a workpiece in a direction perpendicular to the rotational axis of the workpiece, and process a plurality of shaped parts of the cylindrical workpiece at the same time. In this step, each of the broach tools is divided into a plurality of holders in the circumferential direction, and the holders at the same circumferential portion of each of the broach tools are combined to form a broach holder group, and this broach holder group is separated from both ends. A broach tool changing device for a broaching machine, comprising a tool clamping jig for clamping the tool and attaching and detaching the tool from the rotating shaft.