JPH04129642A - Chip discharge structure for lathe - Google Patents

Abstract

PURPOSE:To shorten a processing time and to prevent the damage of a bore surface by installing a chip discharge passage extending through a main spindle and a cooling liquid nozzle through which cooling liquid is discharged in a cylindrical work grasped by the main spindle. CONSTITUTION:A chip discharge pipe 3 the interior of which forms a chip discharge passages 3a is installed in a running-through state in a hollow chuck opening closing shaft 2 extending through a main spindle 1. A cooling liquid nozzle 6 through which cooling liquid is discharged in a work W is located to a tool head 5 for machining a bore of a turret 4. When the bore of the cylindrical work W grasped by a main spindle chuck 14 is machined by means of a tool 5a, machining is carried out as high pressure cooling liquid is discharged through cooling liquid nozzles 6 located around the tool 5a. Thereby, chips generated owing to machining of the inner surface of the bore is forced to flow through the chip discharge pipe 3 togetherwith cooling liquid and flow out to the rear of the main spindle 1, and is discharged through a chip discharge duct 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a chip discharge structure for a lathe that discharges chips during internal diameter machining.

[Conventional technology]

When machining the inner diameter of a cylindrical workpiece, if machining continues with chips accumulating inside, the chips will damage the inner diameter surface.

Therefore, it is necessary to discharge the chips appropriately.

Conventionally, as a means of discharging chips during internal diameter machining,
The structure shown in FIG. 4 is adopted. In other words, the same figure (
As shown in A), the chips a accumulated in the workpiece Wn are flushed out by a high-pressure coolant in a coolant pipe 52 passing through the center of the spindle chuck 51.

In this case, when the cutting tool 53 for inner diameter machining is inserted into the workpiece Wa, the cutting tool 53 gets in the way and the chips a cannot be discharged, so the cutting tool 53 is removed from the workpiece Wa as shown in FIG. Discharge the coolant in the extracted state.

[Problem to be solved by the invention]

With the above conventional structure, if the workpiece Ila is long,
During internal machining, the cutting tool 53 is pulled out many times and chips a
It is necessary to alternately repeat the discharge of the material and the inner diameter machining. Therefore, there is a problem that processing time becomes long.

An object of the present invention is to provide a chip discharge structure for a lathe that can discharge chips while continuously performing internal diameter machining, shorten machining time, and prevent damage to the internal diameter surface.

[Means to solve the problem]

The chip discharge structure for a lathe according to the present invention is provided with a chip discharge passage passing through the main shaft and a cooling fluid nozzle for discharging cooling fluid into a cylindrical workpiece gripped by the main shaft. The coolant nozzle is capable of discharging the coolant into the workpiece when the inner diameter machining tool is inserted.

[For production]

According to this configuration, the coolant discharged from the coolant nozzle can cause chips in the workpiece to be flowed out from the inner diameter machining tool side to the rear of the main spindle through the chip discharge path in the main spindle. Therefore, the inner diameter machining tool does not interfere with the discharge of chips, and chips can be discharged while continuously performing inner diameter machining.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 3.

The chip discharge structure of this lathe is provided with a chip discharge pipe 3 whose inside becomes a chip discharge passage 3a in a hollow chuck opening/closing shaft 2 that passes through the main shaft 1, and which is used for machining the inner diameter of the turret 4. The tool head 5 is provided with a coolant nozzle 6 for discharging coolant into the workpiece W.

The spindle 1 is supported by a bearing 9 on a headstock 8 on a bed 7,
Rotation of the main shaft motor 12 is transmitted via the pulley 10 and the heald 11 . The chuck opening/closing shaft 2 is driven forward and backward by a chuck cylinder 13 behind the main shaft 1, opens and closes the chuck claws 14a of the main shaft chuck 14, and rotates together with the main shaft 1.

The chuck cylinder 13 has a rotatable hollow piston rod 13a that passes through the cylinder body, and the cylinder body is attached to the headstock 8 via a support member (not shown). The piston rod 13a is connected to the rear end of the chuck opening/closing shaft 2.

The chip discharge pipe 3 extends rearward from the main workpiece, passes through the piston rod 13a of the chuck cylinder 13, and has its rear end inserted into the chip discharge duct 15. The chip discharge pipe 3 is supported in a fixed state by attaching a collar portion 3b provided on the outer periphery to the chuck cylinder 13 via a mounting member 16. The chip discharge pipe 3 is supported at two locations: the support portion by this chuck cylinder 13 and the support portion by the spindle chuck 14, which will be described next.

As shown in FIG. 2, the chip discharge pipe 3 is rotatably supported by the spindle chuck 14 via a ring-shaped sliding bearing 17. The sliding bearing 17 is made of resin with good sliding properties such as turcite, and is attached to a locator 19 fixed to the main shaft chuck 14 together with the sleeve 18. The sleeve 18 has a short cylindrical member 20 fixed to the end of the chuck opening/closing shaft 2 slidably fitted thereon. The locator 19 has a contact surface 19a against which the workpiece W is brought into contact.

The tool head 5 has a tool 5a for inner diameter machining fixed to a tool holder 5b, and is provided with a cooling liquid supply hole 21 that is open at the front and rear. Coolant nozzle 6 is connected to tool 5
The tool holder 5b is formed in the shape of a pipe through which the tool holder 5b is inserted.
A coolant chamber 6b communicating with the coolant supply hole 21 of the tool holder 5b is formed on the back surface of the seat portion 6a fixed to the tool holder 5b. The cooling liquid supply hole 21 is connected to the turret 4 via a pipe 22.
It is connected to a coolant supply pipe (not shown) at the rotation axis of the rotor.

In FIG. 1, a chip discharge duct 15 connected to the rear end of the chip discharge pipe 3 is installed in an inclined position on a support bracket 29, and its lower end opens into the dust collection frame 25. A cleaning lid 24 that can be opened and closed is provided at the top of the chip discharge duct 15, and a backflow prevention member 23 made of rubber is attached to the outer periphery of the chip discharge pipe 33.

The dust collection frame 25 guides the chips to the coolant reservoir 27, and in addition to the chip discharge duct 15, the terminal end 26a of the chip discharge conveyor 26 extending from the front and back of the lathe is opened. The chip discharge conveyor 26 discharges chips collected in front of the headstock 8.

As shown in FIG. 3, a collected chips discharge conveyor 28 is provided below the dust collection frame 25 and extends laterally within the coolant reservoir 27, and its terminal end 28a is connected to the subsequent discharge system ( (not shown) in an upper position for evacuation. The collected chips discharging conveyor 28 has an endless conveyor made of slats or a net in a duct, and is configured to transport only the chips, excluding the cooling liquid. The lathe of this embodiment is a two-spindle lathe, and as shown in the figure, two chip discharge ducts 15 are provided for each main spindle 1.

The operation of the above configuration will be explained. As shown in FIG. 2, when a cylindrical workpiece W gripped by the spindle chuck 14 is machined using the tool 5a, the machining is performed while discharging high-pressure coolant from the coolant nozzle 6 around the tool 5a. It will be done. Therefore, the chips generated by the inner surface machining are flowed out behind the main shaft 1 through the chip discharge vibrator 3 together with the coolant, and are discharged into the chip discharge duct 15.

In this way, the chips in the workpiece W are flowed out from the tool 5a side toward the rear of the spindle, so the tool 5a does not become an obstacle, and the chips can be discharged without machining. Therefore, even in the case of a long workpiece W, there is no need to pull out the tool 5a during internal diameter machining, and continuous machining can be performed, reducing machining time. Moreover, the chips generated by the inner diameter machining are immediately discharged before they accumulate, so that damage to the inner diameter surface of the workpiece W can be reliably prevented. Furthermore, since the tool 5a is directly cooled by the cooling liquid, cooling efficiency is improved and machining accuracy is also improved.

In the above embodiment, the coolant nozzle 6 surrounds the tool 5a, but the coolant nozzle 6 is placed adjacent to the tool 5a.
may be provided. Further, the cooling liquid nozzle 6 is connected to the tool 5a.
Any device that can be inserted into the workpiece W together with the tool head may be used, and instead of being attached to the tool head 5, it may be attached directly to the turret 4, or it may be attached to another tool rest of the turret 4, the head stock, etc. .

Further, in the embodiment described above, the chip discharge path 3a was formed by the chip discharge pipe 3 inserted into the chuck opening/closing shaft 2, but the chips could be passed directly into the chuck opening/closing shaft 2 or into the main shaft 1. Also good.

〔Effect of the invention〕

The chip discharge structure of the lathe of this invention is provided with a chip discharge passage that passes through the main spindle, and discharges a cooling liquid from a cooling liquid nozzle provided on the inner diameter machining tool side to flow the chips in the work toward the rear of the main spindle. Since the inner diameter machining tool does not interfere with the discharge of chips, chips can be discharged without continuous machining.

This has the effect of shortening machining time and reliably preventing damage to the inner diameter surface.

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view of an embodiment of the present invention, Fig. 2 is a partially enlarged cutaway plan view thereof, Fig. 3 is a rear view showing the chip discharge duct and collective chip discharge conveyor, and Fig. 4. is an explanatory diagram of the operation of a conventional example. 1... Main shaft, 2... Chuck opening/closing shaft, 3... Chip discharge pipe, 3a... Chip discharge path, 4... Turret, 5... Tool head, 6... Cooling Liquid nozzle, 8.
... Headstock, 13... Chuck cylinder, 14...
Main spindle chuck, 15...Chip discharge duct, W...Workpiece diagram

Claims (1)

[Claims] A chip discharge passage passing through the main shaft is provided, and an internal machining tool is inserted into the cylindrical workpiece gripped by the main shaft,
A chip discharge structure for a lathe including a cooling liquid nozzle capable of discharging cooling liquid into the workpiece.