JPS58137507A - Feed amount limiting device of spindle in machine tool - Google Patents

Abstract

PURPOSE:To prevent a reference front from damage by the adapted face of a stopper, by limiting a feed of the spindle of a machine tool which machines a prescribed depth from the reference front. CONSTITUTION:Before a tool 55 is contacted to a reference front A of a work 3, an adapted face of a stopper 4 positioned to a forward limit for a spindle 1 by a forward limit limiting means 69 can be adapted to the front A under a no- rotational condition, and the spindle is fed while being rotated to advance to a place for the stopper by a slide amount set larger than a prescribed depth, here the slide for the spindle is stopped by a stopper rearward limit limiting means 40. As a result, a feed of the spindle is limited to establish a machining depth and eliminate damage of the adapted face by the stopper.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spindle feed rate regulating device for a machine tool that processes a predetermined depth from a reference front surface, and more specifically, the present invention relates to a spindle feed amount regulating device for a machine tool that processes a predetermined depth from a reference front surface. The sleeve is fitted in a slidable manner and is provided with a regulating means for regulating the retraction limit of the sleeve with respect to the spindle, and a stopper having an abutting surface facing the reference front is fitted in the sleeve in a rotatable but non-slidable manner. death,
A regulating means is provided for regulating the limit of advancement of the structure of the stopper and the sleeve with respect to the spindle, so that the structure can be slid by a predetermined amount with respect to the spindle, and an urging force that urges the structure forward. When the spindle moves forward by a predetermined amount and the cutting tool cuts the workpiece to a predetermined depth, the contact surface of the stopper comes into contact with the reference front surface of the workpiece, thereby causing the structure to A spindle feed of a machine tool in which the forward movement of the spindle is stopped when the sleeve is moved back against the spindle by the above-mentioned predetermined amount against the energizing force and the sleeve stops moving back against the spindle by the above-mentioned retreat limit regulating means. Relating to a quantity regulating device.

Conventionally, there is a feed amount regulating device of this type as shown in FIG. 1, which will be explained using the same figure.

(1) is a spindle/L counterboring machine, with a finishing counterboring tool (2) attached to its tip. A coil spring c!5 with one end seated on the stopper surface (40a) of the spindle (1) is screwed and fixed.
) is biased toward the tip (advance) direction of the spindle (1), and rotates together with the spindle (1) via the key α4, and a sleeve aυ fitted so as to be movable forward and backward; At the same time, the sleeve round shoulder (l
The inner race (t4a) is fixed with the nut (16+) on the radial ball bearing side, and the spindle (11) is a cylindrical housing concentric with the workpiece (3)'s processing certificate on the tip. A contact surface (4a) that comes into contact with a certain reference front surface (A) is provided, and is concentric with the large diameter hole that accommodates at least the base of the counterbore tool (2) and the insertion hole 0 through which the spindle +11 is inserted. The outer race (14b) of the radial ball bearing I is fitted into the bearing chamber 081 filled with grease, and the outer race (14b) of the radial ball bearing I is fitted into the bearing chamber 081 in a concentric skewer shape. This is a device (Il) that restricts the forward movement of the spindle from a cover (4c) etc. that is attached to the rear end surface of the 41 with a bolt (5). Due to the elastic force of the second gloss, the structure consisting of the sleeve (11) and the stopper (4) unites and moves forward against the spindle +I+, and at its forward limit, it interacts with the inner end surface (4t) of the stopper (4) as a forward limit regulating means. Since the back surface (2r) of the counterbore tool (2) is in a press-fit state, the inside of the device rotates together with the spindle (1) even if the 0-weight radial ball bearing is installed, but the spindle fl+ As the feed is applied, the front cutting edge (2Of) of the tip (20a) of the counterbore tool (2) bites into the workpiece (3), and as the spindle (1) further advances, the counterbore process begins. As the spindle (1) advances by a predetermined amount (A'l), the contact surface (4a) of the stopper (4) comes into contact with the reference front surface (A). ) is released, and the stopper (4), while its rotation is braked by the frictional force received from the reference front (A), retreats relative to the spindle fi+ by the predetermined amount (dimension) (1), and the sleeve all
The rear end surface abuts against the stopper surface (40a) of the brim (41) serving as a backward limit regulating means.Even in this abutment state, the abutment surface (4a) and the reference front surface (A) are in abutment state. Because it is in the spindle (11 forward feed is the boxwood (
4 [J, and as a result, the distance between the contact surface (4a) and the tip (20a) (7)
H) is established as the counterbore depth.

However, in such a conventional device (Il), during the movement of the (l1 dimension), the stopper (4) is stopped from rotating due to the frictional force and becomes a non-rotating state. There is a drawback that the reference front surface (A) of the workpiece is damaged by mutual friction or galling that occurs under these conditions, and the contact surface (4a) of the stopper (4) is also damaged, resulting in a shortened lifespan.

Therefore, a technical problem of the present invention is to eliminate the cause of the scratches, that is, to remove the stopper (4) from the workpiece before the tool and the workpiece come into contact when establishing the depth of the floor boring. Place the stopper (
4) is prevented from rotating from the beginning, and the technical means of the present invention to solve this technical problem is to extend the overhang member from the machine tool main body toward the stopper to prevent the stopper from rotating. The overhanging member is engaged in a non-rotatable but slidable manner, and the advance limit regulating means is configured between the stopper and the overhanging member, and the amount of sliding regulated by the advance limit regulating means is equal to the machining depth and distance. H)
It is located at a place where it is set larger than .

An embodiment of the technical means of the present invention will be described below. Note that the same parts as those in the prior art are given the same reference numerals, and the explanation thereof will be omitted, and only the different parts will be explained. A key groove! 21 is formed on the tip end surface of the spindle (11), and keys (52a) are fitted into the five key grooves (bolts 64).
Fixed by Then, the front cutting tool 69 is fitted onto the key (52a) and fixed to the tip of the spindle (1) with a bolt (T).

A tip 57 for front cutting is provided at the tip corner of the cutting tool 551.
) are installed using conventional methods. In addition, the brim (4
1 is screwed onto the spindle fi+, and is fitted with a set screw (7
The collar (77) is prevented from rotating by a collar (77), and a ring (7) is fitted outwardly in the direction of the collar and is prevented from being removed by a set screw (6), and the stopper surface (40a) is attached to the collar (77). In order to prevent grease leakage, there is a slight clearance around the large diameter part of the ring (7S inner surface is sleeve 01), and an oil seal is installed here.The front end of the stopper (4) The part surrounds the outer periphery of the cutting tool 155+ and is symmetrical with respect to the axis of the spindle (1) together with its front end surface, that is, the contact surface (4a). (59) is formed on the outer periphery of the stopper (4). This is a keyway. - is an overhanging member extending from the machine tool body 53) toward the stopper (4), and a retainer 6 is inserted at the tip of the overhanging member 10), and the stopper (4) A flanged bushing that is slidably and rotatably penetrated is fastened with bolts. An oil seal is provided between the flanged bushing (64J) and the stopper (4). β9 is the stopper (4).
4) and the sleeve Qll as a regulating means for regulating the forward limit of the component with respect to the spindle (1),
The inner end of this pin (61) has a pair of parallel notches σ0
) is formed. Further, the retainer ti3 is paired with a cover (7υ is a pole) (74). Also,
A pin (a pin mounting hole extending in the radial direction formed in the 6-beam retainer) is inserted into the retainer T62.
) is positioned and fixed using conventional methods.

Note that σ□□□ is a hole for inserting a pin (61) formed in the flanged bush (64).The inner end of the pin +61 is inserted into the keyway (59), and its notch surface σ0
is in sliding contact with the side surface of the keyway O3. When the structure of the stopper (4) and the sleeve (11) retreats with respect to the spindle (1) until the rear end surface (421) of the sleeve 01 comes into contact with the stopper surface (40a) of the collar (4G), That is, the distance (Zl) between the rear end surface of the keyway 51 and the outer circumferential surface of the pin 6I at the retraction limit is determined from the contact surface (4a) of the stopper (4) to the tip l57).
The distance II (Zl) to the front cutting edge (57a) is set to be larger than the counterbore depth. Comparing this setting with the conventional example, in the case shown in Fig. 1, the sliding distance (stroke) (1) of the stopper (4) with respect to the counterbore depth H) is H〉l. On the other hand, the sliding distance (stroke) (Z+) of the stopper (4) in this embodiment (Fig. 2) is set larger than the counterbore depth (Zl). Since it is set to = H (Z+), the contact surface (4a) of the stopper (4) comes into contact with the reference front surface (A) before the front cutting edge (57a) contacts the reference front surface (A), so as will be described later. It is possible to obtain a great effect.

Next, the operation of the above embodiment will be explained.

First, in the preparatory stage, the spindle +11 is in an inactive state. At this time, since the sleeve Qll is biased toward the tip of the spindle ill by the coil spring (c), the sleeve αυ, the bearing a4, and the stopper (41, etc.) work together to limit the forward movement of the spindle (1). In other words, since the rear end surface of the keyway (51) is in contact with the outer peripheral surface of the pin (to), the stopper
(The position of 41 is restricted to the forward limit. At this time, as mentioned above, the distance (Zl) is smaller than the distance (zl), so
The pin transfer restricts the contact surface (4a) of the stopper (4) to a position forward of the front cutting edge (57a) of the tip (5η) by (Zl-22). Since the tip of (4) surrounds the tip 57), the spindle (1) rotates and the tip 5'? ) does not pose a danger to workers even if it rotates. next,
In this state, the machine tool is operated in a conventional manner to apply rotation and feed to the spindle +11. At this time, as mentioned above, the inner end of the bottle ○ is the keyway 5! 1, so even if the spindle (11) rotates, the stop bar (
4) maintains a non-rotating state. Next, the stop bar
(The contact surface (4a) of 41 is the reference front surface (A) of the workpiece (3)
), the stopper (4) will stop the spindle (1)
Start moving backwards relative to. At this time, since the stopper (4) maintains a non-rotating state as described above, the contact surface (4a) of the stopper (4) slides against the reference front surface (A) of the workpiece (3). (As a result, the reference front surface (A) and the contact surface (4a) are not damaged. While the stopper (4) is retreating relative to the spindle +11, the coil spring ta
Due to the elastic force, the contact surface (4a) of the stopper (4) is kept in pressure contact with the reference front surface (A) of the workpiece (3). Furthermore, when the spindle 111 moves forward, the front cutting edge (57a) of the tip 57) bites into the workpiece (3) and starts counterboring.

In addition, since the stop bar (41) maintains the non-rotating state,
If a hole is formed at the tip of the stopper (4), the direction in which chips are taken out can be made constant. Furthermore, when the spindle +11 is fed and the counterbore process progresses, the rear end surface of the sleeve aυ (421 gaba (41) comes into contact with the stopper surface (40a) of the stopper (4), the bearing I, and the spindle of the sleeve αD. (Relative reception for 11,
The retraction limit of the sleeve 01) relative to the spindle fi+ is ensured. In other words, the stopper (4), the bearing circle, and the sleeve circle act as tensions, and the spindle (
The feed (advance) of 1) is regulated, and as a result, the distance (Z2) between the contact surface (4a) of the stopper (4) and the front cutting edge (57a) of the tip t5n is established as the counterbore depth. Counterbore machining is completed. The distance between the rear end face of the keyway (59) and the outer periphery of the pin hole at the time when the inner floor boring depth is established is (Zl). We explained the case where a boring cutting tool, face milling cutter, or BT
If necessary, a tool such as the A tool that processes a predetermined depth from the reference front surface can be used. In addition, as for applicable machine tools, although a spot boring machine was explained in the above embodiment, a face milling machine, a polling machine (boring machine),
It may be applied to machine tools such as

As explained above, according to the present invention, the spindle feed amount regulating device of a machine tool is fitted onto the spindle of a machine tool for machining a predetermined depth from the reference front, and the sleeve is fitted non-rotatably but slidably relative to the spindle. and a regulating means for regulating the retraction limit of the sleeve with respect to the spindle, a stopper having a contact surface facing the reference front is rotatably fitted to the sleeve, and the stopper and the sleeve are connected to each other. A regulating means is provided for regulating the limit of advancement of the structure relative to the spindle, so that the structure can be slid by a predetermined amount on the spindle, and a biasing means is provided for urging the structure forward. In the spindle feed rate regulating device, which regulates the predetermined depth of machining when the spindle feed is regulated at the retraction limit of the stopper relative to the spindle, an overhanging member is provided extending from the machine tool body toward the stopper. The stopper is engaged with the overhang member in a non-rotatable and slidable 0T capacity, and the forward limit regulating means is configured between the stopper and the overhang member, and the stopper is regulated by the forward limit restricting means. Since the amount of sliding of the component of the sleeve and the sleeve relative to the spindle is set to be greater than the predetermined depth, the amount of sliding relative to the spindle is set to be larger than the predetermined depth, so that the amount of sliding relative to the spindle is set to be greater than the predetermined depth by the advance limit regulating means before the tool and the reference front surface of the workpiece come into contact. The contact surface of the stopper located at the forward limit can now be brought into contact with the reference front surface in a non-rotating state, and while this contact state is maintained, the spindle is rotated and fed to a depth greater than the predetermined depth. As a result, the stopper stops sliding against the spindle by the backward limit regulating means when the set sliding amount has progressed against the stopper.
The feed of the spindle is regulated, thereby establishing the machining depth, and during this operation, the stopper maintains the non-rotating state as described above to maintain the machining depth before the tool contacts the reference surface. Since the workpiece remains in contact with the reference front until the stopper is established, the reference front of the workpiece will not be chewed or damaged by the contact surface of the stopper, and the life of the contact surface of the stopper will be extended. It has the effect of being able to do it.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional spindle feed rate regulating device for a machine tool, and FIG. 2 is a cross-sectional view showing an embodiment of the spindle feed rate regulating device for a machine tool according to the present invention. il+...Spindle (3)...Workpiece (
Work) (5)...Reference front (4)...
Stopper (4a)...Abutting surface of stopper (4)
(11)...Sleeve (to)...Elastic body
(401... Backward limit regulating means (40a)... Stopper surface (53)... In the main body 6 of the machine tool...
・Chip (57a)...Front cutting edge 6ω・
...Cutting tool side...Overhanging member 19...
Advance limit regulating means

Claims (1)

[Claims] A sleeve is fitted onto the spindle of a machine tool that processes a predetermined depth from a reference front surface in a non-rotatable but slidable manner, and a regulating means is provided for regulating the retraction limit of the sleeve relative to the spindle. A stopper having an abutting surface facing the reference front is rotatably fitted in the structure, and a regulating means is provided for regulating the limit of advancement of the structure of the stopper and the sleeve with respect to the spindle. The structure is configured to be able to slide by a predetermined amount with respect to the spindle, and is provided with an urging means for urging the structure forward, and when the feed of the spindle is regulated at the backward limit with respect to the spindle, the In a spindle feed rate regulating device configured to regulate a predetermined depth of the machine tool, an overhang member is provided extending from the machine tool base toward the stopper, and the stopper is non-rotatably but slidably engaged with the overhang member. and the forward limit regulating means is configured between the stopper and the overhanging member, and the sliding amount of the structure of the stopper and the sleeve regulated by the forward limit regulating means with respect to the spindle is set to be less than the predetermined depth. A machine tool spindle feed rate regulating device characterized by a large setting.