JPH01210256A - Complex nc lathe - Google Patents

Abstract

PURPOSE:To uniform the roughness on a machined face by providing a means for controlling the load of a tool motor indexed to a machining position and comparing the detected load with a proper set value to control the push-in amount of a rotary tool or a rotary tool unit, thereby enabling buffing work with a constant pressing force. CONSTITUTION:When buff work is carried out through an outer diameter buff, an outer diameter buff tool unit 20 is mounted on a pot 12 to make indexing to a working position, then a tool rotation motor 13 is driven through a command of an NC machine 10 to rotate a buff grinding wheel 22. Feed motors 5, 7 for screws 6, 8 are driven based on a command of the NC machine 10 to control movement of turret cutter table 9 in X and Y directions and contacts the outer circumferential face of the buff grinding wheel 22 with the outer circumference of a work W. Buff machining load produced through the contact is detected through a load detecting circuit 25 then the detected value is compared with a proper set value P in a comparator 26, and the command value is regulated to maintain the load at a constant level thus controlling driving of a tool rotation motor 13 through a drive circuit 27.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a compound lathe that can perform turning and huffing operations in series.

Conventional technology After machining with a lathe, buffing is often performed to smooth the finished surface, but this huffing was performed as a separate process using a special machine after machining.

Problems to be Solved by the Invention In order to perform huffing with a dedicated buffing machine, the workpiece must be removed from the lathe and mounted on the dedicated machine, which requires time for centering when attaching a chuck, and increases the waiting time of the machine. In addition to the necessity of installing a dedicated machine, there were numerous inconveniences as it was not possible to invest in floor space and a dedicated machine. In addition, with machines dedicated to huffing, the amount of push into the buffing wheel during processing is adjusted manually by the operator, making it difficult to ensure stable accuracy.

The purpose of the present invention is to provide a composite NC lathe that suppresses wastage of time and increases costs, and ensures machining accuracy.
The aim is to provide a lathe.

Means for Solving the Problems In order to achieve the above objects, the composite N and C lathe of the present invention has a Klett tool rest on which a rotary tool or a rotary tool unit is mounted, and the two rotary tool units are allocated to the machining position. The rotating tool includes a driving means for rotationally driving the tool when the tool is taken out, and a control means for detecting the motor load of the driving means and comparing it with an appropriate setting value to control the pushing amount of the rotary tool or the rotary tool unit. This tool Q allows huffing with an appropriate pressing force using a huffing grindstone.

After action turning, when performing huffing with an outside diameter huffing tool, attach the outside diameter huffing tool 20 to the bot 12 using an automatic tool changer, index it to the machining position, connect the clutch 21 of the drive means, and
In response to a command from the C device 10, the Hough grindstone 22 is rotated by the tool rotation motor 13 via a bevel gear and a spur gear train. On the other hand, the NC device 1o drives the feed gears 5.7 of the feeders 6 and 8 to control the turret tool rest 9 along the Xll1lIIZ axes to bring the outer diameter of the Hough grindstone 22 into contact with the outer periphery of the workpiece W. The load on the rotary motor 13 for huffing due to contact is determined by the load detection circuit 25.
It is detected by the comparison circuit 26 and compared with the appropriate set value P.
The command value is adjusted so that the load is constant, and the drive circuit 2
7, the tool rotation motor 13 is controlled.

When machining with a huff for the end face after turning, the huff for the end face is similarly attached to the rotary main shaft 11 and indexed to the machining position, and then rotated by the tool rotation motor] 3 and xIllllllZ
With III control, the end surface of the grinding wheel 18 on the outer periphery of the object is brought into contact, and the load of the tool rotation motor 13 is detected by the load detection circuit 2.
5 and is compared with the set value P by the comparison circuit 26.
The shaft feed motor 5 is commanded to perform processing with an appropriate pushing amount.

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

The lathe has a well-known structure, and a main shaft with an upper main headstock 1 and a screwdriver 2 fitted at the tip is rotatably supported, and the main shaft is rotatably supported on a guide surface opposite to the main shaft in the X-axis direction. A psychological table 3 is movably mounted and fixed, and a workpiece W is gripped between the center 4 of the psychological table and the chuck 2. A suttle (not shown) placed on the Z-axis sentencing guide surface 2 is moved in the X-axis direction by an X-axis feed screw 6 rotated by an X-axis feed motor 5. Further, on the reed, a Klett tool rest 9 is placed on a guide surface in the X-axis direction and is moved by a feed screw 8 rotated by an X-axis feed motor 7.

The X-axis feed motor 5 and the X-axis feed motor 7 are each provided with a position detector, and the current values are detected by the NC device 10.
The position of the tool rest 9 is controlled based on the command.

This Klett tool rest 9 has at least two tool mounting positions, and tools are automatically replaced by a magazine and tool changing device (not shown). At least one tool mounting position is provided with a rotary main shaft 11 for mounting a rotary tool so as to be rotatable by a bearing, and at least one other tool mounting position is provided with tool mounting bongs 1 to 12 for turning. . Then, a tool rotation motor 1 is used to rotate the rotary tool.
3 is provided, and a gear 2 heald etc. that transmits this rotation and a bevel gear 14 at the center of rotation of the turret tool rest 9 are provided.
I'm getting fucked. A gear 15 is mounted on the rotating main shaft 11 and meshes with a bevel gear 1G that meshes with a bevel gear 14 and a gear 17 that is rotatably supported integrally with the bevel gear 1G. Then, an end face huffing tool 19 is attached to and removed from this rotary main shaft 11 by a sub-automatic tool changer and has an end face huffing grindstone 18 attached to its tip.

A commercially available Hough whetstone made of a fibrous abrasive using PVA and various resins as a binder is used. The other tool bot 12 is equipped with an outer diameter Hough tool unit 20 instead of the turning tool.

The outer diameter Hough tool Uni 7l/20 has a shank for mounting on the bot in the center, and an intermediate shaft is supported parallel to the center of the shank axis, and a pawl clutch 21 is formed at the tip of the shank, and the pawl clutch 21 is formed on the shank side. It stands out. In addition, on the opposite side of the shank, a rotating shaft with an outer diameter Huffing stone 22 installed parallel to the shank axis is rotatably supported, and the intermediate shaft having the pawl clutch 21 and the rotating shaft of the Huffing grinding wheel 22 are They are connected via a gear train 23. The tool rest 9 has a pawl clutch at its tip that engages with a pawl clutch 21 when the bot 12 is indexed to the machining position, and a bevel gear 2 that engages with a bevel gear 14 at the center.
A drive shaft having a number 4 is rotatably supported, and the pawl clutch ends are moved and engaged upon command. A load detection circuit 25 detects the load of the tool rotation motor I3, and a preset value P is stored in the NC device 10 to set the output of the load detection circuit 25 and the appropriate value of the pushing amount of the buffing wheel 18.22. A comparison circuit 26 is provided for comparison.

The comparison result is inputted to the X-axis feed 1,000-tough drive circuit 27 by increasing or decreasing the X-axis drive command value.

Note that it is also possible to set upper and lower limits to the set value and provide a danger prevention area so that pushing feed is applied within these limits.

According to the first aspect of the invention, the eight machining can be performed with a constant load, and a uniform machined surface roughness can be obtained. In addition, unnecessary wear of the Hough grinding wheel can be prevented and its life can be extended, which is economical.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the present invention, and shows the tool rest in two positions: one showing the outer diameter buffing state and the other showing the end face buffing state. 7..X-axis feed motor 9..Talent tool rest 11..Rotating main shaft I2..pound 13..Tool rotation motor 18..buffing stone for end surfaces 19..buffing tool for end surfaces 20..heaving for outer diameter Tool unit 22: Buffing stone for outer diameter

Claims (1)

[Claims] (1) A turret tool post (9) on which a rotary tool or rotary tool unit is mounted, and drive means (13, 14, 15) that rotationally drives the tool when the rotary tool or rotary tool unit is indexed to a machining position. , 16, 17, 23, 24)
and a control means (10, 25, 26) that detects the load of the motor (13) of the drive means and compares it with an appropriate setting value (P) to control the pushing amount of the rotary tool or the rotary tool unit. A composite NC lathe characterized in that a buffing stone is used as a rotary tool to enable buffing with an appropriate pressing force.