JPS628962Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a support confirmation device for supporting a workpiece in a machine tool, such as a cylindrical grinder, which closes the outlet of pressure fluid when supporting the workpiece at the tailstock center. Accordingly, the present invention relates to a confirmation device that increases the pressure on the supply side of pressurized fluid and uses this pressure increase to confirm support of a workpiece.

Conventionally, an air hole is bored on the center axis of the tailstock center of a cylindrical grinder, and air is normally blown out from the tip of the center. When the workpiece is supported at the center, the air jet from the tip air hole of the tailstock center is blocked by the center hole of the workpiece, thereby increasing the supply air pressure and confirming that the workpiece is supported. The so-called center check method was in use. However, in the case of small-diameter workpieces, the center hole of the workpiece is small, so if an air hole is drilled at the tip of the tailstock center, the workpiece support part will be missing due to the air hole, making it difficult to support the workpiece. becomes. In addition, if the workpiece center hole opens in the cylindrical part of the workpiece and communicates with the outside, as shown in Figure 1, even if the workpiece is supported at the center, the air jet will not be blocked and the air supply will be interrupted. This had the disadvantage that the air pressure did not increase and support could not be confirmed.

In view of the above-mentioned drawbacks, the present invention reliably confirms the support of small-diameter workpieces and workpieces having a center hole communicating with the outside. A valve for pressure fluid is fixed to a fixed part that does not move, and a lever for moving the spool of the valve is moved to the center of the tailstock or a tailstock shaft that moves in the axial direction integrally with the center;
Attach to a cap, etc. When the workpiece is supported by the center, the lever moves the spool to close the pressure fluid outlet of the valve. In the second embodiment, a valve is fixed to the center, the cap, etc., the spool tip is made to protrude toward the workpiece side, and when the workpiece is supported by the center, the spool tip surface is brought into direct contact with the end surface of the workpiece. The spool is moved in response to the movement of the valve to close the pressure fluid outlet of the valve. In the third and fourth embodiments, the valve mechanism in the second embodiment is simply made into a sleeve shape that encloses the center.

Next, a first embodiment of the present invention will be described with reference to the drawings. 1 is a tailstock main body having a cylindrical hole 2 in the longitudinal direction; 3 is a tailstock shaft slidably inserted into the cylindrical hole 2; a center 4 is fitted to the tip end of the tailstock;
is supported. 6 is housed in a cylindrical hole 7 drilled in the longitudinal direction at the center of the tailstock shaft 3, and is stretched between it and the tailstock body 1 to constantly push the tailstock shaft 3 forward at a constant rate. It is a compression spring that is biased by pressure. Reference numeral 8 denotes a spring receiver provided at the front end of the cylindrical hole 7, and reference numeral 9 denotes a center extraction rod used when extracting the center 4. Usually, the tip of the rod has a gap with the rear end of the center 4, and is attached to the tailstock body. 1 is attached to the center position of the tailstock shaft 3 so that it can move forward and backward, and if necessary, the center extraction rod is advanced to remove the center 4. Reference numeral 10 denotes a bellows-shaped flexible protector having one end fitted to the tip of the tailstock 3 and the other end fitted to the tip of the tailstock main body 1, which prevents the tailstock 3 from moving back and forth. It is configured to be expandable and contractible in the longitudinal direction. Then, when the tailstock shaft 3 moves forward, the portion of the tailstock shaft 3 protruding from the tailstock body 1 is protected from cooling water and dust. Reference numeral 11 denotes a cap fixed to the tip end surface of the tailstock shaft 3, which further protects the protector 10. Reference numeral 12 denotes a valve mounted on a fixed part such as a table 13 that does not move relative to the workpiece, and a valve body 15 having a cylindrical hole 14 in the longitudinal direction parallel to the tailstock axis, which is fitted into the cylindrical hole 14. The sleeve 16 is stretched between the sleeve 16, the spool 17 slidably inserted into the sleeve 16 in the longitudinal direction, and the valve body 15, so that the spool 17 is always positioned to the right in FIG. Biasing compression spring 18
It is composed of. A pressurized fluid inflow passage 19 is bored in the center of the valve body 15 .
The sleeve 16 has an outlet 20 that communicates with the passage 19 and allows pressure fluid to flow into the sleeve.
is bored at a position forward of the front end surface of the spool 17 when it is in an inactive state. Further, a pressure fluid discharge passage 21 is bored in the front end wall of the valve body 15. The spool 17 has a large diameter portion at the tip and the center, and the width in the longitudinal direction of the large diameter portion is such that the outlet 20 can be closed when the center hole of the workpiece is within the allowable size. ing. Further, a passage 22 communicating with the inner chamber of the sleeve is formed in the large diameter portion at the tip of the spool 17 and the small diameter portion between the large diameter portion and the center portion. In addition, the outlet 20 is formed into a groove shape as shown in FIG. 1, or in a groove shape as shown in FIG. If it is configured with multiple passages like this, the movement of the spool will be smooth.
Reference numeral 23 denotes an L-shaped lever having one end fixed to the cap, and the other end 24 extending to the rear on the center line of the spool 17. 25 is the end 2 of the L-shaped lever.
4 is an adjustment bolt screwed onto the spool 17 so that the center line of the spool 17 is aligned with the center line of the spool 17 so that the position can be adjusted. Then, the position is adjusted according to the length of the workpiece. Instead of this adjustment bolt 25, a plurality of stud bolts of different lengths are arranged on the same circumference and attached to the end 24 of the L-shaped lever so that they can be rotated and indexed. It is also possible to determine and use it.

Next, the effect will be explained.

The tailstock main body 1 is fixed at a predetermined position,
It is assumed that the tailstock shaft 3 is in the retracted position. It is also assumed that the position of the adjustment bolt 25 is adjusted according to the length of the workpiece. Furthermore, the pressure fluid flows through the outlet 20
It is assumed that the water flows out from the valve into the valve and is discharged from the passage 21 to the outside. When a workpiece is brought onto the spindle axis by a known loading device or by an operator's hand, the tailstock spindle 3 first begins to move forward. During forward movement, the front end surface of the adjustment bolt 25 touches the spool 17.
The spool 17 comes into contact with the rear end surface, and as the tailstock shaft 3 moves forward, the spool 17 is also moved forward against the compression spring 18 . When the tip of the center 4 is inserted into the center hole on the rear end surface of the workpiece and the workpiece is supported, the spool 1
The large diameter portion at the tip 7 closes the outlet 20, so that the supply pressure of the pressure fluid increases, and support of the workpiece is confirmed by a signal from a supply pressure indicating pressure switch (not shown). If the center hole size on the rear end surface of the workpiece is outside the allowable dimensions, the large diameter part of the spool 17 will not reach the position of the outlet 20 or will pass through, and the outlet 20 will not be closed, so check the support of the workpiece. The next task cannot proceed.

FIG. 2 shows a second embodiment, in which a valve having the same structure as the valve 12 in FIG. and is fixed to the tip of the cap 11. The protruding tip of the spool 26 has a large diameter part, and when the center 4 is inserted into the workpiece center hole and the workpiece is supported, the front end surface of the large diameter part comes into contact with the rear end surface of the workpiece. The pressure fluid outlet in the valve is closed. As a result, if the mounting position of the valve is set at the beginning, there is no need for readjustment even if the length of the workpiece is changed, and it can be adapted to various workpieces.

FIG. 3 shows still another embodiment, in which a sleeve 28 having a pressure fluid discharge passage is inserted into the outer periphery of the center 4 in place of the valve in FIG. 2, and is urged forward by a compression spring 29. , make the tip protrude beyond the center. A pressure fluid supply passage is provided in the center 4, and its outlet is normally communicated with the passage of the sleeve 28. When the center 4 supports the workpiece, the sleeve 28 is pushed by the rear end surface of the workpiece and retreats, and the pressure fluid outlet of the center 4 is connected to the sleeve 28.
It is closed by the inner wall of the This eliminates the need for a complicated valve structure as shown in FIG.

FIG. 4 shows still another embodiment in which a cylindrical body 30 having a passage for supplying pressure fluid is installed in the cap 1 instead of the pressure fluid supply passage in the center 4 in FIG.
Attach to the front end of 1. The sleeve 8 is fitted inside the cylindrical body 30, and its pressure fluid outlet is normally communicated with the discharge passage of the sleeve 28.
This eliminates the need to drill a pressure fluid supply passage in the center as shown in FIG.

As mentioned above, this invention does not provide a pressure fluid outlet at the tip of the tailstock center, so it can be used reliably even when working with small diameter workpieces or when the center hole of the workpiece opens into the cylindrical surface of the workpiece. It becomes possible to confirm the support of the workpiece by the center. Furthermore, when the large diameter portion of the spool closes the pressure fluid passage, the pressure fluid is applied to the large diameter portion in a well-balanced manner from the outer periphery, so that the spool moves smoothly. Furthermore, since the width of the closing part that closes the pressure fluid outlet is set to the allowable dimension of the workpiece center hole, it will of course be possible to prevent defects in machining of the workpiece center hole.
Even if a workpiece is carried in incorrectly, the pressure fluid supply pressure will not increase and the next process will not be carried out.
It acts as a safety device while confirming support.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention when the valve is attached to a fixed part. FIG. 2 is a sectional view showing another embodiment in which the valve is attached to the cap of the tailstock shaft. FIG. 3 is a diagram showing another embodiment in which a sleeve is attached to the tailstock center. FIG. 4 is a diagram showing another embodiment in which a sleeve and a cylindrical body are attached to the tailstock center. 3... Tailstock shaft, 4... Center, 15... Valve body,
17...Spool, 18...Compression spring, 20...
Outlet, 26...Spool, 29...Spring, 30
...Cylindrical body.

Claims (1)

[Scope of claim for utility model registration] 1. When the tailstock shaft is moved in the longitudinal direction and the center fitted on the tailstock shaft is inserted into the center hole of the workpiece,
A support confirmation device in which a pressurized fluid outlet is closed and the supply pressure of the pressurized fluid is increased to confirm support of the workpiece by the center, which has a cylindrical sliding surface in the longitudinal direction, and a hole is formed in the sliding surface. A valve body that allows pressurized fluid to flow out from the outflow port; and a valve body that is fitted into a cylindrical sliding surface of the valve body and is slidable in the axial direction with respect to the valve body, and that and a compression spring that always biases the sliding body in the longitudinal direction so that the outlet is always open when the tailstock shaft moves to support the workpiece. . A workpiece support confirmation device, characterized in that the movement causes the sliding body to slide against the compression spring to close a pressure fluid outlet of the valve body. 2. A workpiece support confirmation device as set forth in claim 1 of the utility model registration claim, in which the valve body outlet closing portion of the sliding body has dimensions that are permissible for the workpiece center hole dimension. 3. The workpiece support confirmation device according to claim 1 of the utility model registration, in which the sliding body is pressed in a well-balanced manner from the outer periphery when the pressure fluid outlet of the valve body is closed by the sliding body. 4. A workpiece support confirmation device as set forth in claim 1 of the utility model registration, in which the valve body and the center are integrated.