JPS5936328Y2 - Both ends processing machine - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a double-end processing machine.

Conventionally, when performing various processes such as end face cutting, inner or outer surface cutting, and chamfering on both ends of long objects such as shafts and pipes, both ends are processed simultaneously to reduce man-hours and improve accuracy. A double-end processing machine is used.

However, conventional double-end machining machines hold the workpiece fixedly and rotate the tool at both ends of the workpiece, which limits the improvement in machining accuracy, especially for long and slender workpieces. Lack of precision was a problem when machining both ends.

Therefore, in view of the above circumstances, a double-end machining machine that reduces man-hours and improves machining accuracy by adopting a structure in which both ends of the workpiece are machined simultaneously while rotating the workpiece has already been disclosed in Japanese Utility Model Publication No. 47-33914 and Japanese Patent Application Publication No. 47-33914. Showa 54-12391
According to these known ones, the member that grips the workpiece is a collet with springs at both ends, and the gripping mechanism of the collet is a fluid mechanism, and the opening mechanism is a spring mechanism. It is done by springs.

The object of the present invention is to further improve these known devices and provide a double-end processing machine with appropriate gripping force and high processing accuracy.

In order to achieve this objective, the present invention includes an air chuck 31 that grips a workpiece such as a shaft at a position near one end of the workpiece.
An opening for operating both chucks in the axial direction in a double-end processing machine equipped with a spring collet chuck 28 that grips the workpiece near the other end and a rotation mechanism that transmits rotational driving force to both chucks. An air conduit 26 and a closed air conduit 27 are provided in the drive case 4, one end of the open air conduit 26 is connected to the open side port 24, and the other end is connected to the airtight chamber 21. The open air pipe line 32'' of the air chuck is branched from the branch part 32 of the channel 26 and connected to the open side of the air chuck, and one end of the other closed air pipe line 27 is connected to the closed side port 25, and the other end is connected to the open side port 25 of the air chuck. The structure of the double-end processing machine is characterized in that the closed air pipe 27' of the air chuck is branched from the branch part 33 of the closed air pipe 27 and connected to the closed side of the air chuck. It takes .

An embodiment of the present invention will be described below based on a vertical cross-sectional view of the main parts of a double-end processing machine. A sleeve-shaped drive case 4 is rotatably supported through bearings 2 and 3 in an opening 1a passing through the shaft in the axial direction.

Note 5. 6. 7. 8. 9 are bearing holders, respectively.

The bearing holder 5 is fixed to the headstock 1 with screws 35° and 36, and the bearing holder 9 is fixed to the headstock 1 with screws 37 and 38.

Further, the drive case 4 and the air tick 31 are fastened together with screws 39.

The drive case 4 is connected to a prime mover (not shown) via a belt 12 connected to a pulley 11 to which a key 20 is fixed.
Rotationally driven by.

13 is a cover, and 14 is a nut screwed onto the drive case 4 to prevent the pulley 11 from loosening.

The drive case 4 cooperates with a cover 15 to protect the cylinder, and an annular piston 16 is slidably housed inside the drive case 4.

The cylindrical slider 20 is moved in the axial direction together with the piston 16 while maintaining airtightness between the peripheral surfaces of the drive case 4 and the cover 15 by stop rings 17, 18, and 19 fixed to the slider 20 via the piston 16. Designed to be movable.

Airtight chambers 21, 22 are thus formed on both sides of the piston 16.

On the other hand, a ring 23 for air supply is provided on the outer periphery of the drive case 4.
is provided on the fixed side so as to maintain airtightness while allowing rotation of the drive case 4.

The ring 23 has an open side port 24 and a closed side port 25.
is installed.

The open side port 24 communicates with the airtight chamber 21 through the open air conduit 32 from a branch part 32 of the open air conduit 26 bored in the drive case 4 and cover 15, and the closed side port 25 communicates with the airtight chamber 21 through the open air conduit 32. A branch portion 33 of the closed air conduit 27 bored through the closed air conduit 27 and the cover 15 communicates with the airtight chamber 22 via the closed air conduit 33'.

28 is a spring collet chuck mounted in the drive case 24 so as to be movable in the axial direction.

Incidentally, the outer circumferential tapered surface 28a of the spring collet chuck 28 provided near its tip slides into engagement with the inner circumferential tapered surface 4a of the drive case 4, and the rear outer circumferential threaded surface 28b of the spring collet chuck 28 is It is screwed onto the inner circumferential threaded surface 20a of the slider 20.

A ring 30 screwed onto the slider 20 and used for positioning the chuck 28 of the spring collet 29 is a rotation stopper pin.

Therefore, the air entering the open side port 24 flows through the open air pipe 26.
The piston 16 is axially directed toward the tip of the chuck 28 of the spring collet. The slider 20 and the chuck 28 of the spring collet move accordingly.
moves in the axial direction, so the chuck 28 of the spring collet opens.

On the other hand, when air is supplied to the closed side boat 25 and the open side port 24 is opened, the air entering from the closed side port 25 is supplied into the closed air pipe 27, and then the closed air pipe 27 is branched. 33, and is press-fitted into the airtight chamber 22 through the closed air pipe 33', and the piston 16 is held in the air chuck 3.
1 and the spring collet 28 closes.

Reference numeral 31 denotes an air chuck, that is, an air-driven claw chuck, which is fixed to the drive case 4 at a position opposite to the tip of the chuck 28 of the spring collet.

The air chuck 31 uses air that enters from the open side port 24, and sends the air to the open pipe line 32'' of the air chuck through a branch part 32 branching from the open air pipe line 26, and connects it to the open side of the air chuck. The claws 34 of the chuck 31 open.

In addition, the air chuck 31 uses air that enters from the closed side port 25 to be distributed from the branch part 33 of the closed air conduit 27 to the closed conduit 27' of the air chuck and connected to the closed side of the air chuck 31. The claw 34 closes.

Therefore, by supplying and discharging air inside the pipe, both end chucks 28 and 31
perform opening and closing operations at the same time.

As the internal structure of the air chuck 31, any conventionally known internal structure may be used.

To explain how to use the double-end processing machine described above, air is supplied from the opening side port 24 to open the spring collet chuck 28 and air chuck 31, and an appropriate workpiece feeding device is installed inside both chucks 28 and 31. After supplying and setting the workpiece W from (not shown), the air is removed from the opening side port 24, and the air is sent to the closing side port 25 to cause the chuck 28 of the spring collet and the air chuck 31.
The workpiece W is gripped and held at positions near both ends thereof.

Next, while rotating both chucks 28.31 via the belt 12, pulley 11, and drive case 4 by the prime mover, various processes such as chamfering or end face cutting are simultaneously performed on both ends of the workpiece W protruding outward from both chucks 28.31. Let's do it.

When the machining is completed, after stopping the rotation of both chucks 28.31, the air supply is switched to the opening side port 24 to open both chucks 28.31 and release the workpiece W. When an unprocessed workpiece is supplied by the work supply device, the processed workpiece W is pushed out to the unprocessed workpiece, and is collected by an after-rain work collection device (not shown).

If the above machining procedure is continuously repeated by electro-hydraulic control or NC control, both ends of a large number of workpieces can be automatically and efficiently processed.

The double-end processing machine of the present invention has the above configuration and can achieve the following effects.

■ The double-end machining machine of the present invention rotates the workpiece while gripping both ends with chucks, and cuts both ends with a non-rotating tool, which not only achieves high work efficiency, but also improves machining accuracy. can be improved.

■ The double-end machining machine of this invention uses air chucks on one of the chucks that grip the vicinity of both ends of the workpiece, so there is a large amount of clearance for chucking, and the gripping force is strong, so there is no risk of the tightening loosening during machining. Furthermore, it does not move erratically during machining.

In this respect, it is possible to help improve the machining accuracy according to the above-mentioned item (2).

■ The double-end processing machine of the present invention uses air force to open and close both chucks through an open air circuit and a closed air circuit, so the chuck tightening and releasing operations are quick and reliable, and the working air By adjusting the pressure and amount, the optimal tightening pressure can be selected in relation to the rotational speed and the allowable tightening type, and the gripping force can be easily adjusted.

Furthermore, since a combination of claw type and spring collet type air chucks are used, stronger clamping force, improved machining accuracy, and axial positioning are achieved in a well-balanced manner. It is.

In addition, since the gripping force can be adjusted by tightening both chucks with air, when gripping a pipe-shaped workpiece, the air force can be weakened, allowing the grip to be gripped without deformation, which improves machining accuracy compared to conventional workpieces. It can be improved from the previous one.

Furthermore, when cutting a large amount with a shaft tool, it is possible to increase the force of the air and grip it.

In conventional chucks using spring collets, the chuck is returned to its original position, that is, opened, using a spring spring, which can cause the gripping mechanism to slow down or even stop moving due to wear and fatigue. Since the present invention uses air to return both chucks, it can be used for a long period of time without fatigue or fatigue.

■ Since a pair of chucks and the rotation mechanism that rotates them are assembled together, there is no need to align these mechanisms each time the setup is made, unlike double-end processing machines that use multiple mechanisms for each part.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing the main parts of a double-end processing machine according to an embodiment of the present invention. 4... Drive case, 11... Pulley, 16... Pin, 20... Slider, 28... Spring collet chuck,
31...Air chuck.

Claims (1)

[Scope of utility model registration request] An air chuck 31 that grips a workpiece such as a shaft near one end, a spring collet chuck 28 that holds the workpiece near the other end, and a rotating mechanism that transmits rotational driving force to both chucks. In a double-end machining machine equipped with a double-end processing machine, an open air line 26 and a closed air line 27 for operating both chucks in the axial direction are provided in the drive case 4, and one end of one open air line 26 is connected to the open side port 24. The other end is connected to the airtight chamber 21, and the open air pipe 32'' of the air chuck is branched from the branch part 32 of the open air pipe 26 and connected to the open side of the air chuck. One end of the closed air pipe 27 is connected to the closed side port 25, and the other end is connected to the airtight chamber 22, and the closed air pipe 27' of the air chuck is branched from the branch part 33 of the closed air pipe 27. A double-end processing machine characterized by being connected to the closed side of an air chuck.