JP6504947B2 - Coolant supply structure of turret type lathe - Google Patents

Description

  The present invention is a technology for supplying a coolant to a cutting tool attached to each tool station of a turret (rotating tool base) such as an NC lathe, and supplies radially from the turret bar (fixed hub) of the tool base body to the turret. The present invention relates to a coolant supply structure for a lathe capable of supplying coolant at high pressure through a passage, finely dividing chips and cooling a cutting tool and a work to improve processing efficiency.

  In a machine tool having a turret such as an NC lathe, coolant is supplied toward the tip of the cutting tool, and processing is performed to cool the cutting edge surface and the work and to discharge chips. As a conventional coolant supply system, if it divides roughly, the external supply system supplied from the back end side of a turret via the piston holder and piston which were attached to the peripheral face of a cutter reception stand, and the diameter from the rotation axis side of a turret There is an internal supply system that supplies via a directional supply passage.

  5 to 7 show a coolant supply device in a conventionally known external supply type turret-type lathe. This turret-type lathe has a slide table 1 disposed on the bed so as to be movable in the Z-axis direction, as shown by a chain line in FIG. 5, and moves in the X-axis direction with respect to the slide table 1 A free turret body 2 is attached. A turret 4 is attached to the turret body 2 via a turret bar 3. The turret 4 has a coupling connection with the turret bar 3 and can be connected or released by advancing and retracting. When the coupling is released, the turret itself is free to pivot, and the tool indexing position is determined. A tool station is provided on the outer peripheral side surface or front surface of the turret 4, and a drill 5A, a boring blade 5B, and a tip 5C for grinding an outer peripheral surface or an end surface of a work are attached. The tip 5C is fixed to one of the tool stations of the turret 4 by a dedicated holder 6.

Further, as shown in FIG. 6, a coolant inflow port 7 corresponding to each tool station is bored on the rear end face side of the turret 4. As shown in FIG. 7, the inflow port 7 is in communication with the coolant discharge port 6 A of each cutting tool or holder 6 via a coolant supply flow passage 8 provided in the turret 4.
On the other hand, a piston 9 and its holder 10 are attached to the tool post body 2. The piston 9 is biased in the direction of protrusion by the spring 11 on the rear end face side, and the coolant that has flowed from the coolant flow path 2A of the tool post body 2 into the inflow port 10A provided on the side of the holder 10 It flows into the axial flow path from the circumferential side and flows to the inflow port 7 of the turret 4.

  In FIG. 5, reference numeral 12 is a headstock, 13 is a chuck of the headstock 12, 14 is a work held by the chuck 13, 15 is a tailstock, 16 is a coolant supply pump, and 17 is a coolant supply tank. is there.

  In the prior art shown in FIGS. 5 to 7, the coolant is pumped from the tank 17 by the supply pump 16, flows through the inside of the tool post main body 2 and flows into the inflow port 10 A of the holder 10, and passes through the piston 9 to the turret 4. To the inflow port 7 of the Then, it is jetted from the discharge port 6A through the flow path 8 and the flow path 6B of the chip holder 6, and is supplied to the cutting surface where the chip 5C and the work 14 make contact, discharging chips and cooling the chip 5C and the work. To do.

  However, in the prior art shown in FIGS. 5 to 7, as shown in FIG. 7, the pressure of the coolant flowing from the tool post body 2 into the holder 10 acts on the end face 9A of the rear end side flange of the piston 9. Thus, the piston 9 acts in a direction to retract it against the biasing force of the spring 11. Therefore, the coolant supply pressure must be such that the force to retract the piston 9 is at least smaller than the biasing force of the spring 11, and must be as low as about 3 MPa.

  Therefore, in the case of the prior art shown in FIGS. 5 to 7, the chips are spirally continuous and wound around the tool to braze the cutting surface of the work or damage the tool, and the chips It piled up like a mountain and there was a problem that it was troubled in the processing.

  Therefore, the applicant has filed an application for a coolant supply device for a lathe described in Patent Document 1 as a solution to the above problems. The technology described in Patent Document 1 is as shown in FIG. 8, and the piston 20 is mounted in a piston holder 21 attached to the tool post body 2 so as to be able to project and retract. The piston 20 is joined to a coolant inflow port 7 provided on the rear end face side of the turret 4. Further, the positional relationship between the inflow port 24 of the piston holder 21 and the piston 20 is set such that the pressure of the coolant supplied into the piston holder 21 from the side of the tool post body 2 acts on the rear end face side of the piston 20.

  As a result, the piston 20 can be made to project by the supply pressure of the coolant, and can be pressed into contact with the inflow port 7 of the turret 4 with a strong force, and the supply pressure of the coolant can be set to 7 MPa or more. Therefore, the high-pressure coolant can reduce the heat of the tool tip and significantly reduce tool wear, which has the advantage of realizing high-speed tool feed. In addition, the high pressure coolant enables the chips to be finely divided, and the discharge becomes smooth, and as a result, the chips wrap around the tool to braze the cutting surface of the work or damage the tool, etc. Absent. In addition, because the chips are finely divided, they are accommodated according to the shape in the container, and the processing becomes extremely easy. In addition to that, there is also an advantage that the automatic chip conveyor can be used effectively.

  On the other hand, in the turret type lathe, as described above, it is fixed to the inflow port 7 on the rear end face of the rotating turret 4 as in the technique shown in FIGS. 5 to 7 and Patent Document 1 (FIG. 8) In addition to the external supply system in which the piston 20 in the side piston holder 21 is made to go straight and surface-joined to supply the coolant, there is also an internal supply system shown in FIG. 9 and FIG. In the coolant supply method shown in FIGS. 9 and 10, the coolant supply passage 30 provided in the axial direction of the turret bar 3 is bent 90 degrees and drawn out in the radial direction, and the outflow port 32 on the outer peripheral surface of the turret bar 3 The coolant is delivered from the inlet port 33 provided on the inner peripheral surface of the turret 4 surface-bonded thereto.

JP, 2014-24040, A

  By the way, in the turret type lathe, it is necessary to rotate the turret 4 according to the content of the cutting operation and to perform position indexing of the blade holder 6 to which the cutting tool corresponding to the target cutting operation is attached. . Therefore, a gap of 20 μm is formed between the outer peripheral surface of the turret bar 3 and the inner peripheral surface of the turret 4. Due to this gap, in the case of a lathe of the type in which the coolant is supplied from the inner side of the turret axis shown in FIGS. 9 and 10, the coolant supply pressure has to be set to about 3 Mpa. If the supply pressure is higher than that, the coolant leaks to the entire peripheral surface from the gap of 20 μm and scatters around.

  Therefore, in this type of turret-type lathe, it is not possible to divide cutting chips by the high-pressure jetted coolant into chips, and the cooling effect of the cutting tool is deteriorated, and the service life of the cutting tool is short. There is a problem that can not be shortened.

  Although it is conceivable to apply the technology of the external supply system previously filed by the present applicant shown in Patent Document 1 (FIG. 8) to a lathe of the internal supply system shown in FIGS. 9 and 10, in that case The end face of the piston should be the same arc as the inner surface of the turret. However, the tip end face of the piston is repeatedly strongly pressed against the inner circumferential face of the turret by high-pressure coolant, causing wear, and there is a disadvantage that high-pressure coolant leaks from the gap with slight offset wear. I could not.

  The present invention is improved and removed in view of the above-mentioned conventional problems, and the piston is formed of a special resin material or an elastic sealing material is disposed on the end face of the piston, and the supply pressure of the coolant is the piston To provide a coolant supply device for a lathe in which the sealability between the piston and the inflow port on the inner surface of the turret is enhanced and the coolant can be supplied at a high pressure of 7 MPa or more. It is a thing.

In order to solve the above problems, the means of the present invention adopted in the present invention has the turret externally fitted rotatably on the outer peripheral surface of the turret bar, and the outer peripheral surface side or front side of the turret by rotating the turret. Position of the blade holder attached to the surface, supplying coolant to the outflow port formed on the outer peripheral surface of the turret bar from the central shaft side of the lathe through the radial flow path of the turret bar, and bonding to the outflow port in lathe coolant supply method for transferring the coolant into the inflow port provided in the turret the inner peripheral surface of, the outflow port side of the turret bar, to form a piston mounting recess, having elasticity in the piston attachment recess fitted with a piston which is formed of resin material, the piston, the passage of the coolant leading to the front end surface from the rear end face is provided through the piston The front end surface of the piston is formed in a phase having the same curvature as the inner peripheral surface of the turret, and gently abuts on the inner peripheral surface of the turret or is slightly separated from the rear end side of the piston A recess for applying a supply pressure of the coolant is formed, and the recess has a cross section orthogonal to the flow direction of the coolant, the radial flow passage of the turret bar communicating with the recess for mounting the piston and the inside of the piston The cross section of the passage is formed larger, the rear end surface of the piston abuts a part of the bottom surface of the recess for mounting the piston, and the supply pressure of the coolant acts on the rear end surface side of the piston. It is a coolant supply structure of a turret type lathe.

In order to solve the above problems, the means of the present invention adopted in the present invention is that the piston is made of a metal material instead of a resin material, and the tip end surface of the piston is the same as the inner circumferential surface of the turret. is formed to an aspect having a curvature and, optionally apart slightly and the turret in the peripheral surface, the O-ring recess for mounting is formed in an annular shape on the tip surface of the piston, the resilient seal to the O-ring mounting recessed portion It is a coolant supply structure of a turret type lathe in which an O-ring which is a material is attached and the O-ring is gently in contact with the inner peripheral surface of the turret.

Means according to claim 3 in which the present invention is adopted to solve the above problems, the piston, in place of the resin material, the rear side is formed of a metallic material, the distal end side is formed of a resin material having elasticity It is a coolant supply structure of a turret type lathe.

  In the first aspect of the present invention, a recess for mounting the piston is formed on the outflow port side of the turret bar, and a piston molded with an elastic resin material is mounted on the recess, and the rear end surface side of the piston is mounted. The coolant supply pressure is applied. Since the supply pressure of the coolant acts on the rear end face side of the piston, the tip end face of the piston is strongly in pressure contact with the inner peripheral face side of the turret when the coolant is supplied. Therefore, the extra-high pressure coolant does not leak out. Also, when the coolant is not supplied, the piston is gently in contact with or slightly separated from the inner circumferential surface of the turret, so it does not wear out significantly even if it is used repeatedly, and prolongs the life of the piston itself It is possible.

Thus, the ability to use ultra-high pressure coolant reduces the heat at the tool edge, significantly reduces tool wear, and has the advantage of achieving high-speed tool feed. is there.
Moreover, the extra-high pressure coolant makes it possible to divide the chips into fine pieces and smooth their discharge, and as a result, the chips wrap around the tool to braze the cutting surface of the work or damage the tool. There is no. In addition, because the chips are finely divided, they are accommodated according to the shape in the container, and the processing becomes extremely easy. In addition to that, there is also an advantage that the automatic chip conveyor can be used effectively.

  According to the second aspect of the present invention, the piston is formed of a metal material, and a recess for O-ring attachment is annularly formed on the end face of the piston, and the O-ring is attached to the recess. Also in this case, since the supply pressure of the coolant acts on the rear end face side of the piston, the tip end face of the piston is strongly pressed against the inner peripheral face side of the turret at the time of supply of the coolant. Exert an action.

Also, when not supplying coolant, the O-rings are either slightly apart in contact with the gradual or turret the inner peripheral surface, similarly to the invention of claim 1, such as significantly worn be repeatedly used It is possible to extend the life of the piston itself.

  According to the invention of claim 3, the rear end side of the piston is formed of a metal material, and the front end side of the piston is molded of a resin material having elasticity. In this case, the tip end side of the piston is the same as the piston material of the first aspect of the present invention, and it is possible to obtain the same function and effect. However, according to the third aspect, since the rear end side is formed of a metal material, it is possible to manufacture inexpensively accordingly.

It is a longitudinal cross-section side view which shows the principal part of the turret type lathe which concerns on one embodiment of this invention. It is a longitudinal section front view showing the principal part of the turret type lathe concerning one embodiment of the present invention. FIG. 3 is a partially enlarged view of FIG. 2 according to an embodiment of the present invention. It is the elements on larger scale of the longitudinal cross-section front view which shows the principal part of the turret type lathe which concerns on other embodiment of this invention. It is the schematic which shows the whole structure of the conventional turret type lathe. It is the figure which looked at the turret of the conventional turret type lathe from the back end side. It is a fragmentary longitudinal cross-sectional view which shows the coolant supply connection part of the conventional turret type lathe. It is a fragmentary longitudinal cross-sectional view which shows the coolant supply connection part of the turret type lathe which concerns on one embodiment of this invention. It is a longitudinal cross-section side view which shows the principal part of the conventional turret type lathe. It is a longitudinal section front view showing the principal part of the conventional turret type lathe.

  Hereinafter, the configuration of the present invention will be described based on an embodiment shown in FIGS. 1 to 3. The basic configurations of the slide table 1, tool post main body 2, turret bar 3, turret 4, turret holder 6 etc. are the same as in the case of the conventional turret-type lathe shown in FIGS. It is attached.

  Thus, in this embodiment, the coolant supply passage 30 is provided at the center of the turret bar 3 on the axis of the lathe. The supply passage 30 is connected to the radial passage 31 and is in communication with an outflow port 32 formed on the outer peripheral surface of the turret bar 3.

  On the other hand, a plurality of inflow ports 33 are provided on the inner circumferential surface of the turret 4 so as to face the outflow ports 32 in correspondence with the indexing positions of the respective tools. The inflow port 33 of the turret 4 is formed on the outer peripheral surface of the turret 4 through the radial passage 34 and the axial passage 35 and further the radial passage 36 and is in communication with the outflow port 37. The outflow port 37 on the outer peripheral surface of the turret is ejected from the inflow port 38 of the turret holder 6 to the cutting edge surface through the passage 39 and the nozzle 40.

  In the present invention, a recess 41 is formed on the outflow port 32 side of the turret bar 3, and a piston 42 made of resin such as polymer resin, MC nylon, PEEK resin having elasticity is fitted and fitted in the recess 41. . The piston 42 has a tip end surface formed in a curved surface having the same curvature as the inner circumferential surface of the turret 4, and forms a recess 43 for applying a coolant supply pressure on the rear end face side. Then, a coolant passage 44 extending from the rear end surface to the tip end surface is provided to penetrate. Further, an O-ring 45 is externally fitted on the circumferential side surface of the piston 42.

  The coolant in this case is supplied at an ultrahigh pressure of 7 Mpa to 30 Mpa. When the super high pressure coolant is supplied, the supply pressure acts on the concave portion 43 on the rear end side of the piston 42, and the end surface of the piston 42 is strongly pressed to the inner peripheral surface of the turret 4 by the supply pressure. Therefore, even when the supply pressure of the coolant is an extra-high pressure, the coolant leaks from the gap between the outer peripheral surface of the turret bar 3 on the stationary side and the inner peripheral surface of the rotatable turret 4 There is no

  The super high pressure coolant is jet-supplied from the nozzle 40 to the cutting surface of the workpiece and the cutting edge through the respective passages of the turret 4 and the turret holder 6, and cutting wastes can be divided into fine chips. Since super high pressure coolant is supplied to the cutting surface of the cutting edge and the work, the cooling effect of both is excellent, and the life of the cutting tool can be prolonged and the cutting speed can be increased.

  Since both are fixedly rigid between the outer peripheral surface of the turret 4 and the inner peripheral surface of the turret holder 6, the coolant does not leak even if the supply pressure of the coolant is an ultra-high pressure.

  By the way, when replacing the cutting tool, the coupling connection between the turret bar 3 and the turret 4 may be released, and the turret 4 may be rotated to stop at the position where the cutting tool is arranged corresponding to the desired operation. . At the time of replacement of the cutting tool, the piston 42 is free because the supply pressure of the coolant does not act, so it does not disturb the rotation of the turret 4.

  FIG. 4 shows another embodiment of the present invention. A metal sleeve 46 is fitted and fitted in a recess 41 provided on the outflow port 32 side of the turret bar 3, and a metal piston 47 is fitted and fitted on the inner side thereof. A recessed portion 48 on which the supply pressure of the coolant acts is formed on the rear end surface side of the piston 47, and an O-ring 50 is externally fitted to a stepped portion 49 provided on the outer peripheral surface on the front end surface side.

  When the coolant is supplied at an ultra-high pressure, the piston 47 fitted and mounted in the recess 41 on the outflow port 32 side of the turret 4 has a supply pressure acting on the recess 48 on the rear end side, and the piston 47 is The O-ring 50 on the front end face is strongly pressed against the inner circumferential surface of the turret 4. Therefore, even when the supply pressure of the coolant is an ultra-high pressure, the coolant does not leak from the gap between the outer peripheral surface of the turret bar 3 and the inner peripheral surface of the turret 4.

  In the state where the coolant is not supplied, the O-ring 50 only gently contacts the inner circumferential surface of the turret 4, and even when the turret 4 is rotated to replace the cutting tool, the O-ring 50 is used. There is no risk of distortion or uneven wear.

  In the present invention, the front end side of the piston is formed of an elastic resin material as in the embodiment of FIGS. 1 to 3, and the remaining portion on the rear end side is formed of a metal material. Is also possible. In this case, it is possible to reduce the material cost by the amount of use of the metal material.

2 ... Tool rest body 3 ... Turret bar 4 ... Turret 6 ... Turret holder 30 ... Coolant passage 31 of turret bar Radial coolant passage 32 of turret bar 32 ... Outflow port 33 of turret bar ... Inflow port 41 of turret ... Outflow port side Recess 42 ... Piston 43 ... Piston Recess 50 ... O-ring

Claims (3)

The turret is externally fitted rotatably on the outer peripheral surface of the turret bar, and by rotating the turret, the position of the blade holder mounted on the outer peripheral surface side or the front side of the turret is indexed, and from the central axis side of the lathe A coolant supply system that supplies coolant to an outlet port formed on the outer peripheral surface of the turret bar via a radial direction flow path of the turret bar and delivers the coolant to an inlet port provided on the inner peripheral surface of the turret joined to the outlet port. In the lathe of
The outflow port side of the turret bar, to form a piston mounting recess, equipped with a piston which is formed of resin material having elasticity to the piston attachment recess,
The piston is provided with a coolant passage extending from the rear end face to the tip end face,
The tip end surface of the piston is formed in a phase having the same curvature as the inner peripheral surface of the turret, and gently abuts on or slightly apart from the inner peripheral surface of the turret,
A recess is formed on the rear end face side of the piston for applying a supply pressure of the coolant, and the recess has a radial direction of the turret bar in which a cross section orthogonal to the coolant flow direction communicates with the piston mounting recess. The flow passage and the cross section of the passage inside the piston are formed larger, and the rear end surface of the piston is in contact with part of the bottom surface of the piston mounting recess,
Coolant supply structure of the turret lathe, characterized in that the supply pressure of the coolant on the rear surface side of the piston has to act. In claim 1,
The piston is formed of a metal material instead of a resin material .
The tip end surface of the piston is formed in a phase having the same curvature as the inner peripheral surface of the turret, and is slightly separated from the inner peripheral surface of the turret,
Said O-ring recess for mounting the distal end surface of the piston is formed in an annular shape, the O-ring is elastic seal member to the O-ring mounting recessed portion is mounted,
The O-ring is gently in contact with the inner circumferential surface of the turret;
Coolant supply structure for turret type lathes. In claim 1,
The piston, in place of the resin material, the rear side is formed of a metallic material, the distal end side is formed of a resin material having elasticity,
Coolant supply structure for turret type lathes.

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