JP4029199B2 - Turret tool post - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a turret tool post.
[0002]
[Prior art]
The turret tool post includes a fixed portion, a turret that is pivotally supported by the fixed portion and has a plurality of tool mounting portions, and a coolant distributor provided in the fixed portion. One end opening of the turret has a coolant. The same number of coolant flow paths as the tool attachment part, which is a receiving port and the other end opening is located in the vicinity of the tool attachment part, are formed in a penetrating manner, and the coolant distributor has a coolant inlet and outlet. The coolant supply path of the coolant distributor is communicated with the coolant flow path of the turret when the turret is fixed, and the coolant outlet of the coolant supply path is closed by the turret when the turret is pivotally indexed. What has been made is known. An example of such a turret tool post is shown in FIGS.
[0003]
In the following description, the side (left side in FIG. 5) on which the turret tool is attached is referred to as the front, and the opposite side is referred to as the rear.
[0004]
4 and 5, the turret tool post includes a fixed part (1) having a through-hole (2) extending in the front-rear direction, a turret (3) rotatably supported by the fixed part (1), and one turret tool post. And a coolant distributor (4) having a coolant supply path (5) and attached to the fixed portion (1).
[0005]
An inward flange (6) is fixed to the rear end of the fixing portion (1), and a cover (7) is fixed to the rear surface of the flange (6) so as to cover the center portion thereof. A through-hole (8) extending in the front-rear direction is formed in the center of the cover (7), and the joint (9) that connects the coolant supply hose (9) to cover the through-hole (8) on the rear surface of the cover (7) 10) is installed. The joint (10) is formed with a through hole (11) penetrating the center portion in the front-rear direction, and a rear end opening of the through hole (11) is formed by a lid (12) fixed to the rear surface of the joint (10). It is closed.
[0006]
The turret (3) is arranged in the turret body (13) having a stepped through hole (14) extending in the front-rear direction at the center of rotation and the through hole (2) of the fixed part (1), and the front end is stepped. A swivel shaft (15) which is long in the front-rear direction fixed to the turret body (13) while being inserted into the rear portion of the through hole (14), and a stepped through which is fixed to the front surface of the turret body (13) A lid (16) for closing the front end opening of the hole (14), and a plurality of tool attachment members (17) fixed to the outer peripheral surface of the turret body (13) at equal angular intervals in the circumferential direction. The swivel shaft (15) is rotatably supported with respect to the fixed portion (1) by a plurality of, here two, rolling bearings (18). The rear end of the pivot shaft (15) passes through the portion surrounded by the flange (6) and extends into the cover (7), and is supported rotatably on the flange (6) by the rolling bearing (19). ing. A through hole (20) extending in the front-rear direction is formed at the center of the pivot shaft (15). A large diameter portion (21) is formed at the front end of the through hole (20). In addition, in the portion between the rolling bearing (18) on the rear side that supports the rotating shaft (15) with respect to the fixed portion (1) and the rolling bearing (19) that supports the flange (6), the rotating shaft A gear (22) is fixed around (15). The gear (22) meshes with a gear (23) attached to a driving shaft of a turret driving motor (not shown). The front surface of the tool mounting member (17) is a tool mounting portion (24), and the tool (25) is mounted here.
[0007]
The coolant distributor (4) has a long shaft shape in the front-rear direction, and is disposed in the through hole (20) of the pivot shaft (15). The coolant distributor (4) includes a small-diameter portion (4a) that covers most of the portion excluding the front end portion, and a medium-diameter portion (4b) and a large-diameter portion (4c) that are integrally formed with the front end portion. There is a slight gap between the outer peripheral surface of the small diameter portion (4a) and the inner peripheral surface of the through hole (20). The medium diameter part (4b) is located in the large diameter part (21) of the through hole (20) of the turning shaft (15). The outer peripheral surface of the medium diameter portion (4b) is in contact with the inner peripheral surface of the large diameter portion (21) of the through hole (20). The large diameter portion (4c) protrudes forward from the pivot shaft (15) and is located in the through hole (14) of the turret body (13). There is a slight gap between the outer peripheral surface of the large diameter portion (4c) and the inner peripheral surface of the through hole (14). The rear end of the coolant distributor (4) is inserted into the through hole (11) of the joint (10) through the through hole (8) of the cover (7), and the joint (10 ). The coolant supply passage (5) of the coolant distributor (4) includes a first passage portion (5a) extending forward from the rear end surface and having a front end reaching the large diameter portion (4c), and a first passage portion (5a). And a second passage portion (5b) that extends radially outward from the inner peripheral surface of the front end portion and bends forward to open to the front surface of the large diameter portion (4c). An opening to the front surface of the large diameter portion (4c) of the second passage portion (5b) of the coolant supply passage (5) serves as a coolant outlet (28). The rear end opening of the first passage portion (5a) of the coolant supply passage (5) is closed by a lid (12). Further, a coolant inlet (29) extending in the radial direction is formed in a penetrating manner in the peripheral wall portion of the first passage portion (5a) at the rear end portion of the small diameter portion (4a) of the coolant distributor (4), The coolant enters the coolant supply path (5) from the coolant supply hose (9) connected to the joint (10) through the coolant inlet (29) and exits from the coolant outlet (28).
[0008]
A coolant channel (30) is formed through the lid (16), the turret body (13), and the tool mounting member (17) of the turret (3). One end of the coolant channel (30) is opened on the rear surface of the lid (16) so as to face the large diameter portion (4c) of the coolant distributor (4) to be a coolant inlet (31), and the other end is A coolant discharge port (32) is formed at the front end of the surface of the tool mounting member (17) facing the radially outer side. The number of coolant channels (30) is the same as that of the tool attachment member (17), and is formed at equiangular intervals in the circumferential direction. All the coolant inlets (31) are located on one circumference (C) centering on the turning center of the turret (3). When the turret (3) is fixed, the coolant outlet (28) of the coolant supply channel (5) of the coolant distributor (4) matches the coolant inlet (31) of one of the coolant channels (30), The coolant channel (30) communicates with the coolant supply channel (5).
[0009]
Machining of the workpiece (W) by the turret tool post having the above-described configuration is performed as follows. First, the turret (3) is turned so that the first tool (25) used in the first step is at the machining position. When the first tool (25) comes to the machining position, the coolant passage (30) having the coolant discharge port (32) in the tool mounting member (17) to which the first tool (25) is mounted is distributed as coolant. The turret (3) is fixed in this state in communication with the coolant supply path (5) of the tool (4). Next, coolant is sent from a coolant tank (not shown) through a coolant supply hose (9) to the coolant supply path (5) from the coolant inlet (29) of the coolant distributor (4) to the coolant supply path (5). It is discharged from the coolant discharge port (32) through the coolant channel (30). In this state, the workpiece (W) is processed in the first step by the first tool (25). At this time, the tool (25) and the workpiece (W) are cooled by the discharged coolant, and the chips adhering to the tool (25) and the workpiece (W) are washed away. After completion of the first step, the turret (3) is turned so that the second tool (25) used for machining in the second step is at the machining position, and the workpiece (W) is moved in the same manner as above. Processing in the second step is performed. By repeating such operations, the workpiece (W) is processed in all steps.
[0010]
[Problems to be solved by the invention]
However, the conventional turret tool post described above has the following problems. In other words, it has been proved that supplying coolant at a high pressure of, for example, about 50 kgf / cm ² is effective for improving the chip processability and tool life in turning and for stable operation of an automatic line. . By the way, when the turret (3) is turned, the outlet (28) of the coolant supply path (5) of the coolant distributor (4) is blocked by the lid (16) of the turret (3). In such a case, the inside of the coolant distributor (4) may become high pressure, and the coolant distributor (4), the detent pin (26), the coolant supply hose (9), etc. may be damaged. In order to prevent these damages, the pressure resistance must be enhanced to increase the cost. In addition, when the inside of the coolant distributor (4) becomes high pressure, the frictional force at the contact portion between the coolant distributor (4) and the turret (3) increases, and the motor that drives the turret (3) is overloaded. Cause damage to the motor. In addition, the coolant is rapidly discharged and stopped every time the turret (3) is indexed, so that a water hammer phenomenon occurs and the coolant distributor (4) is damaged, or the coolant supply hose (9 ) Or the pump may be damaged. Furthermore, in order to prevent the inside of the coolant distributor (4) from becoming high pressure when the turret (3) is swung, the pump may be operated and stopped every time the turret (3) is indexed. In order to shorten the time, the turret (3) is swung while the pump is still operated, so that a dedicated high-pressure / high-speed switching valve is required, which increases the cost.
[0011]
The object of the present invention is to solve the above-mentioned problems, to prevent the coolant pressure in the coolant distributor from becoming high at the time of turning the turret, and to prevent the occurrence of the water hammer phenomenon. It is to provide a cheap turret tool post.
[0012]
[Means for Solving the Problems and Effects of the Invention]
A turret tool post according to the present invention includes a fixed portion, a turret that is pivotally supported by the fixed portion and has a plurality of tool mounting portions, and a coolant distributor provided in the fixed portion. The same number of coolant channels as the tool mounting part, which is the coolant receiving port and the other end opening is located in the vicinity of the tool mounting part, are formed in a penetrating manner. And one coolant supply passage having the same outlet is formed, and when the turret is fixed, the coolant outlet of the coolant distribution passage of the coolant distributor communicates with one of the coolant passages of the turret, and when the turret is indexed, the coolant supply passage A turret tool post whose coolant outlet is closed by a turret. There the other end opening passage for coolant coolant as many as the coolant channel has been made with the coolant relief for discharge port for discharging missed the outside together made with coolant receiving opening is formed in a penetrating manner, coolant receiving coolant channel The inlet and the coolant inlet of the coolant escape passage are alternately formed on the circumference centering on the turret turning center, and the coolant outlet of the coolant supply passage is relatively on the circumference when the turret is indexed. Movement of the coolant makes the coolant escape passage communicate with the coolant supply passage of the coolant distributor, and the coolant inlet of the coolant escape passage is closed by the coolant distributor when the turret is fixed. It is a thing.
[0013]
According to the turret tool post of the present invention, when the turret is pivotally indexed, the coolant escape passage communicates with the coolant supply passage of the coolant distributor, so that the coolant fed into the coolant distributor at high pressure is Through the escape passage, the coolant is discharged from the coolant discharge outlet. Therefore, the inside of the coolant distributor is prevented from becoming a high pressure even when the turret is turned, and damage to the coolant distributor, the non-rotating pin, the coolant supply hose, and the like is prevented. In addition, it is not necessary to reinforce these pressure resistances, and the cost is reduced. In addition, since the inside of the coolant distributor is prevented from becoming a high pressure, the frictional force at the contact portion between the coolant distributor and the turret does not increase, and as a result, the motor that drives the turret is not overloaded. Thus, the motor is prevented from being damaged. In addition, since the coolant is not repeatedly discharged and stopped every time the turret is indexed, the occurrence of a water hammer phenomenon is prevented, and the coolant distributor, coolant supply hose, and pump are prevented from being damaged. Furthermore, an expensive dedicated high-pressure / high-speed switching valve for preventing the inside of the coolant distributor from becoming high when the turret is turned is not necessary, and the cost is reduced. When the turret is fixed, the coolant receiving port of the coolant escape passage is closed by the coolant distributor, so that the coolant is fed into the coolant passage of the turret without being released.
[0014]
For example, the coolant inlet of the coolant escape passage has an arc shape that is long in the circumferential direction of the circumference.
[0015]
In this case, when the turret is swiveled and indexed, the outlet of the coolant supply path of the coolant distributor is between the coolant inlet of one coolant passage and the coolant inlet of the coolant passage adjacent thereto. The coolant that has moved relative to the coolant inlet of the escape passage will surely flow into the coolant distributor at high pressure from the coolant escape outlet through the coolant escape passage. Discharged.
[0016]
Further, for example, in the initial stage and the final stage of the turret swivel indexing, the coolant outlet of the coolant supply passage of the coolant distributor is connected to the coolant inlet of the coolant passage and the coolant inlet of the coolant release passage adjacent thereto. Sometimes it is designed to straddle both.
[0017]
In this case, the coolant outlet of the coolant supply passage of the coolant distributor is not closed even in the initial and final stages of the turret swivel index, preventing the coolant distributor from becoming high pressure even for a moment. Is done.
[0018]
Further, for example, the coolant discharge outlet of the coolant release passage is formed at a position where the chips adhering to the outside of the turret can be washed.
[0019]
In this case, the chips adhering to the outside of the turret can be washed by the coolant discharged from the coolant release outlet of the coolant release passage when the turret is swiveled and indexed. Therefore, it is possible to effectively use unnecessary coolant when the turret is swiveled.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0021]
1 and 2 show a turret tool post according to the present invention, and FIG. 3 shows an enlarged part of the turret tool post according to the present invention. 1 to 3, parts corresponding to those shown in FIGS. 4 and 5 are denoted by the same reference numerals.
[0022]
In this embodiment, the turret (3) includes a plurality of coolant relief blocks (40) fixed to a portion between adjacent tool mounting members (17) on the outer peripheral surface of the turret body (13). Yes. A coolant escape passage (41) is formed in a penetrating manner across the lid (16), turret body (13), and coolant release block (40) of the turret (3). One end of the coolant escape passage (41) is opened on the rear surface of the lid (16) so as to face the large diameter portion (4c) of the coolant distributor (4) to be a coolant inlet (42), and the other end is It opens to the rear surface of the block (40) and serves as a coolant discharge outlet (43). An L-shaped pipe (44) is connected to the coolant release outlet (43) of the coolant release passage (41) so that the pipe line communicates with the coolant release passage (41). The L-shaped tube (44) extends rearward from the base end portion and is bent radially inward, and the tip is located between the rear surface of the turret body (13) and the fixing portion (1). Yes.
[0023]
The coolant inlet (42) of the coolant escape passage (41) is located between the adjacent coolant inlets (31) on the circumference (C) where the coolant inlet (31) of the coolant passage (30) is located. Is formed. The coolant inlet (42) of the coolant escape passage (41) has a long arc shape in the circumferential direction of the circumference (C). The coolant outlet (28) of the coolant supply passage (5) of the coolant distributor (4) is connected to the coolant inlet (31) of the coolant passage (30) in the initial stage and final stage of the swivel indexing of the turret (3). And it extends over both of the coolant inlets (42) of the coolant escape passage (41) adjacent thereto (see FIG. 3).
[0024]
In the turret tool post described above, the work (W) fixed to the spindle of the machine tool is processed in the same manner as the turret tool post shown in FIGS. Note that when the turret (3) is fixed, the coolant receiving port (42) of the coolant escape passage (41) is closed by the front end surface of the coolant distributor (4), so that the coolant does not escape and is reliably removed. It is fed into the coolant channel (30) of the turret (3).
[0025]
When the turret (3) is pivotally indexed, the coolant outlet (28) of the coolant supply passage (5) of the coolant distributor (4) moves relatively on the circumference (C), and as a result, escapes the coolant. Since the coolant moves relatively on the coolant inlet (42) of the flow path (41), the coolant that has been fed into the coolant distributor (4) flows from the coolant inlet (42). Enters the passage (41), passes through the passage (41), is discharged from the coolant discharge outlet (43) into the L-shaped pipe (44), and is discharged from the tip to the outside of the tool post. The coolant pressure in the distributor (4) is prevented from becoming high. Moreover, the chips adhering to the outside of the tool post are washed away by the discharged coolant.
[0026]
In the initial stage and final stage of swivel indexing of the turret (3), the coolant outlet of the coolant supply passage (5) of the coolant distributor (4) is connected to the coolant of the coolant passage (30) as shown in FIG. Since it spans both the inlet (31) and the coolant inlet (42) of the coolant escape passage (41) adjacent to the inlet (31), the coolant is distributed even in the initial and final stages of the turret (3) swivel indexing. The coolant outlet (28) of the coolant supply passage (5) of the tool (4) is not always closed, and the pressure in the coolant distributor (4) is prevented from becoming a high pressure although the pressure is slightly increased.
[Brief description of the drawings]
FIG. 1 is a front view in which a required portion showing a turret tool post according to the present invention is cut away.
2 is a cross-sectional view taken along line II-II in FIG.
FIG. 3 is a portion of FIG. 1 showing the relationship between the coolant inlet of the turret coolant passage and the coolant escape passage and the outlet of the coolant supply passage of the coolant distributor in the initial stage and the final stage of swirling indexing of the turret. It is an enlarged view.
FIG. 4 is a front view of a conventional turret tool post with a required portion cut away.
FIG. 5 is a cross-sectional view taken along line VV in the figure.
[Explanation of symbols]
(1): Fixed part
(3): Turret
(4): Coolant distributor
(5): Coolant supply path
(24): Tool mounting part
(28): Coolant outlet
(29): Coolant inlet
(30): Coolant flow path
(31): Coolant inlet
(32): Coolant outlet
(41): Coolant escape passage
(42): Coolant inlet
(43): Coolant relief outlet

Claims (4)

A fixed portion, a turret that is pivotally supported by the fixed portion and has a plurality of tool mounting portions, and a coolant distributor provided in the fixed portion are provided. One end opening of the turret serves as a coolant inlet. In addition , the same number of coolant flow paths as the tool mounting portion, which is the coolant discharge port whose other end opening is located in the vicinity of the tool mounting portion, are formed in a penetrating manner, and one coolant having a coolant inlet and a outlet is provided in the coolant distributor. A supply passage is formed, and when the turret is fixed, the coolant outlet of the coolant supply passage of the coolant distributor communicates with one of the coolant passages of the turret, and when the turret is indexed, the coolant outlet of the coolant supply passage is closed by the turret. A turret turret designed as described above,
The turret, the other end opening coolant channel as many coolant relief passage was made and coolant relief for discharge port for discharging the coolant to the outside one end opening is made with the coolant inlet opening is formed in a penetrating manner, coolant The coolant inlet of the flow path and the coolant inlet of the coolant escape flow path are alternately formed on the circumference centered on the center of rotation of the turret, and the coolant outlet of the coolant supply path is By relatively moving on the circumference, the coolant escape passage communicates with the coolant supply passage of the coolant distributor, and the coolant inlet of the coolant escape passage is closed by the coolant distributor when the turret is fixed. Turret tool post designed to be done. The turret tool post according to claim 1, wherein the coolant receiving port of the coolant escape passage has an arc shape long in the circumferential direction of the circumference.   The coolant outlet of the coolant supply passage of the coolant distributor spans both the coolant inlet of the coolant passage and the coolant inlet of the coolant escape passage adjacent thereto in the initial and final stages of the turret swivel indexing. The turret tool post according to claim 1 or 2, wherein:   The turret tool post according to claim 1, 2 or 3, wherein the coolant discharge outlet of the coolant release passage is formed at a position where chips adhering to the outside of the tool post can be washed.

Images