JPS6117766Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for removing chips from a machined hole, and its purpose is to reliably remove chips remaining at the bottom of a relatively small-diameter blind hole.

In conventional chip removing devices, the tip of an air nozzle is generally inserted into a machined hole and air is ejected to remove chips. However, if the hole diameter is small, it is difficult to insert the nozzle into the hole.

In other words, as a condition for inserting a nozzle into a machined hole and removing chips reliably, there must be a sufficient space between the outer circumferential surface of the inserted nozzle and the inner circumferential surface of the machined hole through which the discharged chips can pass. In addition, a sufficient amount of air is required to blow away the chips. When the hole is small, such as 5 mm or less, it becomes difficult to secure the gap and the nozzle diameter, and as a result, it may be necessary to place the nozzle tip above the hole opening and blow out air. many.

In this case, the ejected air flow blocks the opening of the machined hole, resulting in an air stagnation area at the bottom of the hole, which prevents the discharge of chips. For this reason, chips that remained without being removed sometimes caused trouble in tapping and the like.

In order to eliminate such conventional drawbacks, the present invention
The tip of the air jet nozzle member inserted into the rotating main shaft is eccentrically set to less than half the diameter of the machined hole, and the nozzle is positioned above the opening of the machined hole. Air is spouted out while rotating in unison.

Embodiments of the present invention will be described below with reference to the drawings.

10 is a spindle head of a machine tool with an automatic tool changer, and this spindle head 10 has a spindle 1 formed at one end with a tool socket 12 for removably receiving various tools.
1 is rotatably supported. This tool socket 1
2 has an air jet nozzle 13 opened, and this jet nozzle 13 connects to a passage 14 bored in the main shaft 11 and the main shaft head 1.
It is connected to a pressurized air source 18 via an annular groove 15, a passage 16, and a switching valve 17 formed on the zero side.
As one of the tools inserted into the tool socket 12, as shown in the figure, the tip of the nozzle member 20 is bent so that the diameter of the machined hole is 2 mm with respect to the axis of the main shaft 11.
A chip removal tool 22 is provided which has a nozzle 21 which is eccentric by a factor of less than 1/2. It communicates with the annular groove 24 corresponding to the outlet 13 . A pull stud 2 is attached to the tip of the shank portion 22a.
5 is provided in a protruding manner, and is clamped and unclamped by a clamping device 27 inserted into the through hole 11a of the main shaft 11. When the tool 22 is inserted and the spindle head 10 is brought close to the workpiece W with the center of the machined hole Wa of the workpiece W and the center of the main spindle 11 aligned, and the opening of the machined hole Wa and the nozzle 21 are brought close together, as shown in FIG. As shown in , the center of the nozzle 21 is shifted from the center of the machined hole by the amount of eccentricity, and a part of the nozzle opening faces the remainder of the machined hole opening, and the remainder of the machined hole opening does not oppose. That will happen. In this state, when the main shaft 11 is rotated and the switching valve 17 is opened to blow out air, the air is injected into the machined hole Wa along the hole inner wall in the nozzle eccentric direction, and is reversed at the bottom of the hole and released together with chips. A strong air flow is generated without air stagnation even in small-diameter machined holes. Moreover, by rotating the main shaft 11, air is blown into every corner of the machined hole, and chips can be completely discharged to the outside.

As described above, according to the present invention, the tip of the nozzle is arranged eccentrically above the opening of the machined hole, and air is ejected to remove chips while moving the nozzle in a circular motion concentrically with respect to the center of the machined hole. By doing so, the nozzle diameter can be made relatively large even in a small-diameter hole, and sufficient space for discharging chips can be secured, so that it is possible to completely remove chips.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of a spindle head showing an embodiment of the present invention. 10... Spindle head, 11... Main shaft, 12... Tool socket, 14, 16... Passage, 15... Annular groove, 1
8... Air supply source, 20... Nozzle member, 21
... Nozzle, 22 ... Chip removal tool, Wa ... Machining hole.

Claims (1)

[Scope of utility model registration request] A tool with an air jet nozzle member protruding from it is attached to the tool holder of the spindle, which has a pressurized air supply path and is rotatably supported on the shaft. On the other hand, an air nozzle with an eccentricity of one-half or less of the diameter of the machined hole is opened, the axis of the tool is substantially aligned with the center of the machined hole, and the air nozzle is eccentrically aligned above the opening of the machined hole, A chip removal device for a machined hole, characterized in that the spindle is rotated to blow out pressurized air.