JPH0222171Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention uses the so-called work reference method, in which other parts of the workpiece are machined using the machined surface of the workpiece (hereinafter referred to as the workpiece) as a reference plane. The present invention relates to a tool feed rate regulating device for a machine tool for regulating the feed rate of a tool in machining.

[Prior art]

Conventionally, when regulating the feed amount of a tool in workpiece-based machining, a stopper is placed near the tool, such as a drill, and the feed rate of the stopper that comes into contact with the reference surface on the workpiece and the machining surface on the workpiece are adjusted. Devices are known in which the amount of feed of a tool for drilling a hole of a predetermined depth is regulated by a microswitch and kicker provided between a stopper and each movable member of the tool (for example, , see Utility Model Application Publication No. 17293/1983).

However, in this device, the drill and the stopper are separated and moved independently, so that the guide of the drill relative to the workpiece is unstable, leading to center runout, which may reduce machining accuracy. In addition, the stability of the stopper, which is brought into contact with the reference surface of the workpiece using pressurized air, is uncertain, and there are also variations in the LS detection due to the micro switch and kicker mentioned above, and variations in stopping the drive system due to the detection signal. As a result, the feed rate of the tool changes, and highly accurate drilling of a constant depth cannot be expected.

[Purpose of invention]

The present invention was developed in view of the conventional problems as described above, and it is possible to mechanically abut the stopper against the reference surface of the workpiece and securely fix it, and the stopper also The purpose of the present invention is to provide a tool feed amount regulating device for a machine tool that can accurately guide a tool to the machining surface of a workpiece and can machine the machining surface to a desired height from a reference surface with high precision. There is.

[Structure of the idea]

This invention is a machine tool that processes a workpiece using its machined surface as a reference surface, and has a device for regulating the feed rate of the tool, a tool at the tip, and a locking member attached to the rear end so that the position can be adjusted. a stopper having a tool shaft, a tool guide portion that guides the tool to the machining surface of the workpiece, and a restriction portion that comes into contact with the locking member to restrict movement of the tool in the depth direction of the workpiece machining;
The stopper lock device is configured to tighten and lock a drive rod for adjusting the position of the stopper with a cylindrical member, thereby fixing the stopper with its abutting portion in contact with the reference surface. Position the regulating part at a predetermined position,
The regulating portion regulates the feed amount of the tool.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show an embodiment of the present invention,
1 is a bed fixed on the common bed 10 of the machine tool of this embodiment, and the bed 1 has front and rear (first
A guide rail 2 extending in the left direction in the figure is provided. A slide table 3, which is a tool feed stand, is mounted on the guide rail 2 so as to be movable back and forth, and a piston rod 28a of a back and forth cylinder 28 is fixed to the lower surface of the slide table 3.
The cylinder 28 is located in the recess 2a of the guide rail 2.
is fixed to. Also, the above slide table 3
There is a tool head 5 for transmitting rotational force to the tool.
is installed.

A motor stand 4 is arranged above the slide table 3, and the motor stand 4 is fixed to the slide table 3 by four connecting bolts 4a and a mounting bracket (not shown).
Further, a drive motor 6 is attached to the motor stand 4, and a drive pulley 6 attached to the drive motor 6
A is connected by two V-belts 8 to a driven pulley 5a attached to the rear end of the transmission shaft 9 of the tool head 5.

A slide joint 12 for connecting the transmission shaft 9 to the tool shaft 11 is provided at the front end of the transmission shaft 9 of the tool head 5. The slide joint 12 is for transmitting the rotation of the transmission shaft 9 to the tool shaft 11 while absorbing some of the forward movement of the transmission shaft 9. A slide hole 9a is recessed in the front end of the transmission shaft 9 constituting the slide joint 12.
A connecting rod 13 is slidably inserted into the slide hole 9a, and the connecting rod 13 is slidably but non-rotatably connected to the front end of the transmission shaft 9 by a semicircular key 14. Further, a guide member 15 is slidably fitted to the outer periphery of the front end of the transmission shaft 9, and a coil spring 40 is inserted between the two to urge the two to move away from each other in the axial direction. The front end 15a of the guide member 15 is screwed onto the front end of the connecting rod 13, and a guide elongated hole 15c formed in the rear end 15b of the guide member 15 has a guide hole 15c embedded in the transmission shaft 9. A guide pin 9b is slidably inserted.

A tapered connecting hole 13a is formed in the connecting rod 13, and a tapered connecting portion 11a formed at the rear end of the tool shaft 11 is inserted into and connected to the connecting hole 13a. Also, the tool shaft 11
A locking member 16 is slidably fitted in the middle of the locking member 16, and the locking member 16 is fitted in the rear end of the locking member 16.
An adjustment nut 17 for adjusting the position is provided, and the adjustment nut 17 is screwed onto the tool shaft 11, and a tool 18 is attached to the tip of the tool shaft 11.

Further, a workpiece support device 23 is installed in front of the tool shaft 11 of the common bed 10, and a chuck 23a of the workpiece support device 23 supports the workpiece 2.
2 can be attached and detached.

A stopper 19 is provided between the bed 1 and the workpiece support device 23 so as to be movable in the feeding direction of the tool shaft 11, and a tool guide portion 20 is mounted on the head 19a of the stopper 19 by a bearing 21. It is rotatably but non-slidably mounted, and the tool shaft 11 is inserted into the tool guide section 20 so as to be slidable and rotatable. Further, the rear end portion of the tool guide portion 20 serves as a regulating portion 20a that comes into contact with a locking member 16 fitted to the tool shaft 11 to regulate the amount of feed of the tool shaft 11. Furthermore, a contact portion 19b that can come into contact with a reference surface 22a of the workpiece 22 is provided on the front end surface of the head 19a of the stopper 19 in a protruding manner.

A driving rod 25a of a stopper driving device 30 is connected to a connecting flange portion 19c integrally formed on the head 19a of the stopper 19. The stopper driving device 30 is connected to the stopper moving device 24.
and a stopper lock device 25, and the stopper moving device 24 locks the contact portion 19 of the stopper 19.
The stopper moving device 2 is for reciprocating the stopper 19 between a forward position where the contact portion 19b contacts the reference surface 22a of the workpiece 22 and a retracted position where the corresponding contact portion 19b separates from the reference surface 22a.
A piston 24b is inserted into the cylinder hole 24a of No. 4 so as to be slidable in the feeding direction of the tool shaft 11, and the piston rod of the piston 24b is
It is fixed to the rear end of the drive rod 25a. Note that 24c and 24d are the cylinder holes 24
This is a supply passage that supplies hydraulic oil to the inside of the a.

The stopper lock device 25 is for fixing the stopper 19 at the forward position, and two thin cylindrical fixing rings 26 are provided in the cylinder hole 25c formed in the holding portion 25b of the lock device 25. The gap between the fixing ring 26 and the cylinder hole 25c forms an oil reservoir 27, and the drive shaft 25a is inserted into the fixing ring 26 in the direction of feed of the tool shaft 11. The base portion 25d of the holding portion 25b is fixed to the common bed 10. Note that 25e is a supply passage for supplying hydraulic oil to the oil reservoir 27.

Next, the operation will be explained.

With this embodiment device, the machined surface 22 of the workpiece 22
b is the reference surface 22a formed by processing in the previous process.
When processing to the same height as the locking member 16, first
The length B from the front end surface of the tool 18 to the cutting edge of the tool 18 is adjusted to be equal to the length A from the rear end surface of the regulating portion 20a to the tip end surface of the abutting portion 19b. This adjustment is made by moving the locking member 16 back and forth using the adjustment nut 17.

Next, in order to fix the regulating portion 20a of the stopper 19 at a predetermined reference position, the workpiece 22 is first attached to the chuck 23a of the workpiece support device 23, and the stopper 19 is moved forward by the stopper moving device 24. When the abutting portion 19b of the stopper 19 abuts against the reference surface 22a of the workpiece 22, the regulating portion 20a of the stopper 19 is located at its reference position, and in this state, the oil sump 27 of the stopper lock device 25 is Supply hydraulic oil at high pressure. Then, the fixing ring 26 deforms inward, thereby clamping the drive shaft 25a, and as a result, the stopper 19 is locked at the reference position.

Next, in order to process the processing surface 22b of the workpiece 22, the drive motor 6 is started, and in this state, the longitudinal movement cylinder 28 is extended. Then, the rotation of the drive motor 6 is transmitted to the tool shaft 11 via the pulleys 6a, 5a, the transmission shaft 9, and the slide joint 12, and the tool head 5 moves forward together with the slide table 3 due to the extension of the longitudinal cylinder 28. transmission shaft 9,
The tool shaft 11 moves forward via the slide joint 12,
As a result, the tool 18 moves forward while rotating and processes the processing surface 22b of the workpiece 22. In this case, the tool shaft 11 is guided by the tool guide portion 20 of the stopper 19, and the guide portion 20 rotates at substantially the same speed as the tool shaft 11. The front end surface of the locking member 16 of the tool shaft 11 is the regulating portion 20a of the stopper 19.
When the tool 18 comes into contact with the rear end surface, the forward movement of the tool 18, that is, the feed thereof, is restricted, and as a result, the machining surface 22b of the workpiece 22 is machined to the same height as the reference surface 22a. Further, when the locking member 16 comes into contact with the regulating portion 20a, the forward movement of the tool shaft 11 is stopped, but the transmission shaft 9 moves forward a little while pressing the coil spring 40 in the guide member 15. becomes.

As described above, in this embodiment, the abutment part 19b of the stopper 19 is brought into contact with the reference surface 22a of the workpiece 22, and the restriction part 20a of the stopper 19 is used to control the tool 1.
Since the feed amount of 8 is regulated, the machining surface 22b can be precisely machined to the same height as the reference surface 22a, and at this time, the tool shaft 11 is guided by the tool guide part 20 of the stopper 19, so the tool shaft 11 and, in turn, center runout of the tool 18 can be reliably prevented, and as a result, machining accuracy can be improved.

Furthermore, in this embodiment, the stopper 19 is locked in its forward position by the stopper lock device 25, so the locking member 16 is stopped by the stopper 19, thereby preventing the locking member 16 from coming into contact with the workpiece 22 as in the conventional case. The machined surface 22b is the reference surface 22.
When the height reaches the same height as a, the feeding force increases to the workpiece 22.
As a result, workpiece 22
can be prevented from being damaged. At this time, since the transmission shaft 9 and the tool shaft 11 are connected by the slide joint 12, the shock caused when the locking member 16 contacts the stopper 19 can be absorbed. Furthermore, since the stopper is positioned by tightening and fixing the outer periphery of the drive rod with a stopper lock device, the position of the forward end of the tool can be secured with high precision, and the tool can be pressed during machining. Even if the pressure fluctuates, the positional accuracy of the stopper does not vary.

Furthermore, a locking member that adjusts the position of the cutting edge of the tool relative to the contact portion of the stopper with an adjustment nut screwed onto the outer periphery of the tool is brought into contact with the rear end of the tool guide portion of the stopper. Since the mechanical settings are made according to the method, there is no variation in the machining depth, and it is also possible and easy to preset the tool.

In addition, in the above embodiment, the machined surface 22 of the workpiece 22
The case where the machined surface 22b is machined to the same height as the reference surface 22a has been explained, but of course the machined surface 22b is the same height as the reference surface 22a.
It can also be machined to a height different from a, in which case the length B from the locking member 16 to the tool 18 may be adjusted. Further, in the above embodiment, the locking member 16 of the tool shaft 11 is brought into contact with the restricting portion 20a of the stopper 19, but in the present invention, the restricting portion 20a of the stopper 19
The slide table 3, which is a tool feed stand, may be brought into contact with a. Furthermore, in the above embodiment, a cylinder is used as the stopper moving device 24, and a fixing ring 26 is used as the stopper locking device 25, but these may of course be other general moving devices or locking devices.

[Effect of idea]

As described above, according to the present invention, in a machine tool that processes a workpiece using its machined surface as a reference surface, it is possible to adjust the position of the device that regulates the feed amount of the tool, with the tool at the tip and the rear end. A tool shaft with a locking member attached thereto, a tool guide portion that guides the tool to the machining surface of the workpiece, and a regulating portion that comes into contact with the locking member and restricts the movement of the tool in the depth direction of the workpiece machining. The structure has a stopper with which the workpiece is held, and a stopper lock device that locks the stopper by tightening a drive rod for adjusting its position with a cylindrical member.In addition to the effect of reliably preventing the workpiece from being damaged by the machining feed force, This makes it possible to prevent the center of the tool from running out relative to the workpiece machining surface, to ensure the position of the forward end of the tool with high precision, and to reliably stop the tool at the forward end position. This has the effect of preventing the occurrence of variations in depth.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a tool feed amount regulating device for a machine tool according to an embodiment of the present invention, and FIG. 2 is a sectional plan view thereof. 3...Tool feed stand (slide table), 5...
...Tool stand (tool head), 18...Tool, 19...
... Stopper, 19b ... Contact part, 20 ... Tool guide part, 20a ... Regulation part, 22 ... Workpiece, 22a ... Reference surface, 22b ... Machining surface,
24...stopper moving device, 25...stopper lock device.

Claims (1)

[Claims for Utility Model Registration] A tool feed amount that advances a tool on a transmission shaft mounted on a tool rest facing the machined surface of a workpiece to a predetermined position with reference to the reference surface of the workpiece. The regulating device is such that the tool is attached to the front end of the transmission shaft via a slide joint, and the stopper is mounted on a drive rod that is parallel to the transmission shaft and movably supported by a stopper drive device in the tool feeding direction. The stopper is provided with a tool guide portion that guides the tool in the feeding direction, and the front end of the stopper is formed with an abutment portion that can come into contact with a reference surface of the workpiece. A regulating part is formed at the rear end of the tool guide part to regulate the feed amount of the tool by abutting a locking member whose position is adjusted by an adjustment nut screwed onto the outer periphery of the tool, and a regulating part is formed near the stopper. A stopper moving device is provided for reciprocating the stopper between forward and backward positions in which the contact portion contacts and separates from the reference surface, and a stopper lock device is provided for tightening and fixing the outer periphery of the drive rod in the forward position of the stopper. A tool feed amount regulating device for a machine tool, characterized in that: