Lathe with a through-type steady rest

Abstract

To provide a lathe equipped with passage type steady rest in which the number of slide guides is not increased and a width thereof is widened, a carriage with a tool rest mounted thereon and the steady rest do not interfere with each other, a position of the tool rest is stabilized during cutting, and cutting accuracy for a processing object is maintained.SOLUTION: A lathe comprises a bed 2, a spindle stock 3, a tail stock 4, a carriage 6 with a tool rest 5 mounted thereon and a passage type steady rest 7 that passes by the tool rest 6. The bed 2 has two stripes of slide guides 9, 9' provided with slide flat surfaces 8, 8', a clamp groove 10 and an auxiliary rail 11. The carriage 6 and the passage type steady rest 7 are movable along the slide guides 9, 9', an upper part of the passage type steady rest 7 is provided with an upper support part 16 and a lower support part 17 that surround around a processing object 1, and a lower part of the passage type steady rest 7 is provided with a clamp member 13 and a bolt that engage with the clamp groove 10 and fix the passage type steady rest 7 at any position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a lathe for handling long workpieces, which supports the workpiece at a location different from the location where the workpiece contacts the tool rest for cutting, and which is equipped with a pass-through type steady rest that can move in the longitudinal direction of the lathe without interfering with the tool rest. [Background technology]

[0002] Conventionally, in lathes that handle long workpieces, one end of the workpiece is held by a headstock and the other end by a tailstock, and a steady rest is provided to support the center of the workpiece to prevent it from bending or whirling. This type of lathe generally comprises a bed with two sliding guides, a headstock fixed to one end of the bed, a tailstock that can be moved and fixed on the sliding guides, a carriage that carries a tool rest and can be moved on the sliding guides, and a steady rest that can be moved and fixed on the sliding guides. Furthermore, since the carriage and steady rest, which are located between the headstock and tailstock, move on the same sliding guide and cannot pass each other, after cutting from one end or the other of the workpiece to near the center (just before the carriage hits the steady rest), the workpiece and steady rest must be removed from the machine, allowed to pass the carriage, and the steady rest must then be placed back on and the workpiece reset. To avoid this hassle, Patent Document 1 (microfilm of Japanese Utility Model Application No. 2-117253 (Japanese Utility Model Application Laid-Open No. 4-76338)) describes a lathe that is equipped with a bed (c), a tool rest (b) that can move across the left bed and part of the center bed, and a steady rest main body (1) that can move across the right bed and part of the center bed, and by making an arm (3) retractable from within the steady rest main body (1), the tool rest (b) and the steady rest main body (1) can pass each other without interfering with each other (see in particular Figures 1 and 2 and lines 3-8 on page 5 of the specification).

[0003] Furthermore, Patent Document 2 (Japanese Patent No. 6628401) describes a lathe that includes one tool bit rail (43), two anti-sway device rails (53), a cutting section (4) having a tool bit mounting section (42) and a tool bit (41) that can move along the tool bit rail (43), and an anti-sway device (5) having a receiving section (52), a support section (51), and an oil supply section (54) that can move along the anti-sway device rail (53), and the cross sections of the cutting section (4) and the anti-sway device (5) when viewed from the direction of axis A do not overlap with each other, so that the cutting section (4) and the anti-sway device (5) do not interfere with each other (see, in particular, Figure 3, paragraphs 0026 to 0027, and paragraph 0049). Although the lathes described in Patent Documents 1 and 2 are both lathes equipped with a pass-through type steady rest, the lathe described in Patent Document 1 has three rows of beds (c) for moving the tool rest (b) and the steady rest body (1), and the lathe described in Patent Document 2 has one rail for the tool (43) and two rails for the steady rest device (53) for moving the tool holder mounting portion (42) and the receiving base portion (52), so in both cases the width of the area where the bed and rails are installed becomes wide. Furthermore, in the lathe described in Patent Document 2, the tool bit attachment portion (42) moves along a single tool bit rail (43), which reduces the precision of cutting work by the tool bit (41). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Microfilm of Utility Model Application No. 2-117253 (Utility Model Application No. 4-76338) [Patent Document 2] Patent No. 6628401 (Patent Publication No. 2017-64819) Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above problems, the first objective of the present invention is to provide a lathe equipped with a pass-through type steady rest that prevents interference between the carriage on which the tool post is mounted and the steady rest, without increasing the number or width of sliding guides.The second objective of the present invention is to stabilize the position of the tool post during cutting in a lathe equipped with a pass-through type steady rest, thereby maintaining the cutting accuracy of the workpiece. [Means for solving the problem]

[0006] The invention according to claim 1 is A lathe including a bed, a headstock fixed to one end of the bed, a tailstock movable and fixed on the bed, a carriage mounted with a tool rest and movable on the bed, and a pass-through type steady rest that can pass the carriage on the bed, The bed is provided with two parallel sliding guides having a bed sliding surface on the upper surface, and a clamp groove or a protrusion on the side surface for guiding the pass-through type steady rest, The carriage is movable between the two sliding guides while contacting one side of the bed sliding surface and one side of the other bed sliding surface, The pass-through type steady rest can move while contacting the other side of the other bed sliding surface, a steady rest support portion is provided on an upper portion of the pass-through type steady rest, the steady rest support portion supporting the vicinity of the longitudinal center of the workpiece that is held by the headstock and tailstock and that is to be machined by the tool rest; The pass-through type steady rest is characterized in that a clamp device is provided at the bottom thereof, which engages with the clamp groove or the protrusion and fixes the pass-through type steady rest at any position.

[0007] The invention according to claim 2 is a lathe equipped with the pass-through type steady rest according to claim 1, The anti-vibration support portion is characterized by comprising a lower support portion that supports the lower side of the workpiece, and an upper support portion that supports the upper side of the workpiece and is detachable or movable relative to the lower support portion.

[0008] The invention according to claim 3 is a lathe equipped with the pass-through type steady rest according to claim 1 or 2, The bed is provided with an auxiliary rail on a side surface for guiding the pass-through type steady rest in the longitudinal direction of the bed, The pass-through type steady rest is characterized by having an auxiliary engagement portion that engages with the auxiliary rail and is movable in the longitudinal direction of the bed. [Effects of the Invention]

[0009] According to the lathe equipped with the pass-through type steady rest of the invention of claim 1, only two parallel sliding guides are provided on the upper surface of the bed, so the number of sliding parts does not increase and the width does not widen. Furthermore, the pass-through type vibration rest of the present invention is capable of moving while contacting the other bed sliding surface except for the surface that the carriage contacts, so that it can pass by on the bed without interfering with the carriage. In addition, the carriage on which the tool rest is mounted straddles the two sliding guides and can move while in contact with one side of the bed sliding surface and the other bed sliding surface, so that the position of the tool rest is stable during cutting processing, and cutting processing accuracy for the workpiece can be maintained.

[0010] According to the invention of claim 2, in addition to the effect of a lathe equipped with a pass-through type steady rest of the invention of claim 1, the steady rest support part consists of a lower support part that supports the lower side of the workpiece, and an upper support part that supports the upper side of the workpiece and is detachable or movable relative to the lower support part, so that the workpiece can be set after removing the upper support part or moving it to a position where it does not get in the way, thereby improving work efficiency.

[0011] According to the invention of claim 3, in addition to the effect of a lathe equipped with a pass-through type steady rest of the invention of claim 1 or 2, an auxiliary rail is provided on the side of the bed to guide the pass-through type steady rest, and the pass-through type steady rest has an auxiliary engagement part that engages with the auxiliary rail and is movable in the longitudinal direction of the bed, so that the pass-through type steady rest can be moved in a more stable state. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of a lathe equipped with a pass-through type steady rest according to an embodiment; [Figure 2] 1 is a cross-sectional view of a lathe equipped with a pass-through type steady rest according to an embodiment. [Figure 3] FIG. 10 is a cross-sectional view of a lathe with the upper support portion of the pass-through type steady rest open. [Figure 4] 10A and 10B are diagrams illustrating the operation of a clamping device that fixes a pass-through type steady rest. [Figure 5] 10A and 10B are diagrams illustrating a procedure for setting a workpiece on a lathe. [Figure 6] This is a diagram showing the state when cutting is performed while the carriage passes over a pass-through type steady rest. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described with reference to examples. [Example]

[0014] FIG. 1 is a perspective view of a lathe equipped with a pass-through type steady rest according to an embodiment. As shown in Figure 1, the lathe equipped with a pass-through type steady rest according to the embodiment is a lathe for handling a long workpiece 1, and is equipped with a bed 2, a headstock 3 fixed to one end of the bed 2, a tailstock 4 that can be moved and fixed on the bed 2, a carriage 6 that is equipped with a tool rest 5 and can be moved on the bed 2, and a pass-through type steady rest 7 that can move along the bed 2 and pass the carriage 6 on the bed 2. The bed 2 is provided with two parallel sliding guides 9, 9' having sliding planes 8, 8' on the upper surface, and a clamp groove 10 for guiding the pass-through type steady rest 7 in the longitudinal direction of the bed 2 and an auxiliary rail 11 on the side. In addition, a tenon-shaped protrusion 12 is provided on the upper surface of the carriage 6 in a direction perpendicular to the longitudinal direction of the bed 2, which fits into a dovetail groove (not shown) provided on the underside of the tool rest 5, allowing the tool rest 5 to be held movably.

[0015] FIG. 2 is a cross-sectional view of a lathe equipped with a pass-through type steady rest according to the embodiment, taken along a plane perpendicular to the central axis of the workpiece 1 between the tailstock 4 and the carriage 6. As shown in Figure 2, the carriage 6 straddles the two sliding guides 9, 9', envelops the upper part of one of the sliding sections 9, and fits into a part of the other sliding guide 9' (the part on the left side in Figure 2), and is able to move along the two sliding guides 9, 9' while contacting one sliding plane 8 and one side of the other sliding plane 8'. In addition, the pass-through type steady rest 7 is fitted into a part of the other sliding guide 9' (the right part in Figure 2), and is capable of moving along the other sliding guide 9' while contacting the other side of the other sliding plane 8', and can be fixed at a position that supports the workpiece 1. In order to enable the pass-through type steady rest 7 to be fixed at any position, a clamping device consisting of a clamping member 13 that engages with a clamping groove 10 provided on the side of the bed 2 and a bolt 14 that moves the clamping member 13 up and down is provided at the bottom of the pass-through type steady rest 7. Furthermore, since there is a gap between one side of the other sliding plane 8' with which the carriage 6 contacts and the other side of the other sliding plane 8' with which the pass-through type vibration rest 7 contacts, the carriage 6 and the pass-through type vibration rest 7 can move freely in the longitudinal direction of the bed 2 without interfering with each other. Furthermore, the lower end of the pass-through type steady rest 7 is provided with an auxiliary engagement portion 15 that engages with an auxiliary rail 11 on the side of the bed 2. Therefore, when the pass-through type steady rest 7 is moved in the longitudinal direction of the bed 2, it can be moved in a stable state.

[0016] FIG. 3 is a cross-sectional view of the lathe with the upper support portion 16 of the pass-through type steady rest 7 in an open state. As shown in FIGS. 2 and 3, the upper part of the pass-through type steady rest 7 according to the embodiment is provided with an upper support part 16 positioned above the workpiece 1 and a lower support part 17 positioned below it. Furthermore, in the upper right portion of the sliding guides 9, 9', there is a gap between the upper surface of the carriage 6 and the lower surface of the lower support portion 17, so that even though the lower support portion 17 protrudes toward the tool rest 5, there is no interference between the carriage 6 and the lower support portion 17. In addition, an upper support 18 is provided at the left end of the arc-shaped portion at the lower left of the upper support part 16, and the amount of protrusion from the arc-shaped portion can be adjusted. Also, a lower support 19 is provided at the left and upper ends of the arc-shaped portion at the upper left of the lower support part 17, and the amount of protrusion from the arc-shaped portion can be adjusted. Furthermore, as shown in FIG. 3, the upper support part 16 is hinged to the upper right end part of the lower support part 17. Therefore, when setting the workpiece 1 on the lathe for cutting, the left side of the upper support part 16 is lifted and opened, and the workpiece 1 is positioned at the cutting position from directly above using a crane or the like, and one end and the other end can be held by the headstock 3 and tailstock 4, respectively. Thereafter, upper support portion 16 is returned to its original position and fixed, and the protrusion amounts of upper support 18 and lower support 19 are adjusted, so that the periphery of workpiece 1 can be pressed evenly at three points.

[0017] FIG. 4 is a diagram illustrating the operation of the clamp device that fixes the pass-through type steady rest 7. Figure 4(A) shows the state in which the pass-through type steady rest 7 is not fixed. In this state, there is a gap between the clamp groove 10 and the clamp member 13, so the pass-through type steady rest 7 can move along the other sliding guide 9'. Then, when the bolt 14 is rotated and screwed into the screw hole 20 on the underside of the pass-through type steady rest 7 in the state shown in Figure 4(A), the clamp member 13 moves upward, and as shown in Figure 4(B), the upper left end comes into close contact with the clamp groove 10, and the pass-through type steady rest 7 can no longer move along the other sliding guide 9' and is fixed in place.

[0018] Figure 5 is a diagram illustrating the procedure for setting the workpiece 1 on the lathe, and Figure 5(A) shows the state before the workpiece 1 is transferred to the lathe. Then, in the following (Steps 1) to (Steps 4), the workpiece 1 is held by the headstock 3 and the tailstock 4, and then the center of the workpiece 1 in the longitudinal direction is supported by the upper support 18 and the lower support 19 of the pass-through type steady rest 7. (Step 1) As shown in FIG. 5(A), the pass-through type steady rest 7 is positioned near the center of the area to be cut, and the bolts 14 are tightened to fix it to the bed 2. (Step 2) As shown in FIG. 5(B), the left side of the upper support part 16 is lifted and opened, and the upper part of the arc-shaped part at the upper left of the lower support part 17 is opened. (Step 3) The workpiece 1 is transported by a crane or the like, lowered from directly above the bed 2, and positioned close to the lower support 19 as shown in Figure 5(C), and then one end and the other end of the workpiece 1 are held by the headstock 3 and the tailstock 4, respectively. (Step 4) As shown in Figure 5(D), return the upper support part 16 to its original position and fix it, and adjust the protrusion amount of the upper support part 18 and the lower support part 19 to press evenly around the periphery of the workpiece 1 at three points.

[0019] Figure 6 shows the state when cutting processing continues after the reciprocating table 6 has passed the pass-through type steady rest 7, and Figure 6(A) shows the state in which cutting processing is being performed on the workpiece 1 located in front of the pass-through type steady rest 7 using the tool rest 5 mounted on the reciprocating table 6. In the state shown in Figure 6(A), after cutting processing of the workpiece 1 on the front side of the pass-through type steady rest 7 is completed, the reciprocating table 6 is moved so that it passes by the pass-through type steady rest 7, as shown in Figure 6(B), and the reciprocating table 6 is then moved further so that it is positioned behind the pass-through type steady rest 7. Next, in order to perform cutting work on the vicinity of the position of the pass-through type steady rest 7, which cannot be cut in the state of FIG. 6(A), the pass-through type steady rest 7 is positioned slightly forward as shown in FIG. 6(C). When changing the position of the pass-through type steady rest 7, first adjust the amount of protrusion of the upper support 18 and the lower support 19 to move them away from the surface of the workpiece 1, then loosen the bolts 14 and move the clamping member 13 downward to release the fixed state, and move the pass-through type steady rest 7. Then tighten the bolts 14 to move the clamping member 13 upward to fix it, and adjust the amount of protrusion of the upper support 18 and the lower support 19 to apply even pressure to the periphery at three points. Then, when cutting is performed on the object 1 in the state shown in FIG. 6(C), cutting of the entire object 1 is completed. In this way, the state in which the workpiece 1 is held by the headstock 3 and tailstock 4 does not change at all before and after the carriage 6 and the pass-through type steady rest 7 are moved past each other, and changing the position of the pass-through type steady rest 7 only requires operating the upper support 18 and lower support 19, moving it towards the front, and fixing it (operating the bolt 14).This means that the carriage 6 can be positioned behind the pass-through type steady rest 7 in a short amount of time, and the positional relationship between the workpiece 1 and the tool rest 5 changes very little.

[0020] Modifications of the embodiment are listed below. (1) In the embodiment, flat sliding surfaces 8, 8' are provided on the upper surfaces of the two sliding guides 9, 9', but as long as the tailstock 4, carriage 6 and pass-through type steady rest 7 can move in the longitudinal direction of the bed 2, they do not have to be flat, and for example, they may be surfaces having multiple convex strips parallel to the longitudinal direction of the sliding guides 9, 9'. Therefore, in claim 1, the expression "bed sliding surface" is used. (2) The bed 2 in the embodiment has clamp grooves 10 on the side surfaces for guiding the pass-through type steady rests 7, but the clamp grooves 10 may be replaced with protrusions. In such a case, the clamp member 13 is a member having a recess that engages with the protrusion. (3) The bed 2 in the embodiment has a clamp groove 10 and an auxiliary rail 11 on the side to guide the pass-through type sway rest 7, but the auxiliary rail 11 and auxiliary engagement portion 15 may be omitted and the pass-through type sway rest 7 may be guided only by the clamp groove 10. Conversely, the clamp groove 10 and clamp member 13 may be omitted, and the pass-through type steady rest 7 may be guided only by the auxiliary rail 11, and the auxiliary engagement portion 15 that engages with the auxiliary rail 11 may be moved up and down like the clamp member 13, so that the pass-through type steady rest 7 can be fixed at any position. This embodiment is similar to the modified example (2) above, in which the auxiliary rail 11 and the auxiliary engagement portion 15 are omitted and the pass-through type steady rest 7 is guided only by the ridge. Furthermore, instead of moving the auxiliary engagement portion 15 up and down, a screw hole that reaches the auxiliary rail 11 may be provided in the auxiliary engagement portion 15, and a stopper screw may be screwed into the screw hole to prevent the pass-through type steady rest 7 from moving. In short, it is sufficient that a clamp device is provided at the bottom of the pass-through type steady rest 7 that engages with the clamp groove 10 or protrusion (auxiliary rail 11) and fixes the pass-through type steady rest 7 at any position.

[0021] (4) In the embodiment, the upper part of the pass-through type steady rest 7 is provided with an upper support part 16 positioned above the workpiece 1 and a lower support part 17 positioned below it. The upper support part 16 is hinged to the upper right end of the lower support part 17, but it is not limited to being hinged; the upper support part 16 may be made detachable or movable relative to the lower support part 17, and the upper part of the arc-shaped part at the upper left of the lower support part 17 may be open. (5) In the embodiment and the modified example of (4) above, the upper support part 16 is detachable or movable relative to the lower support part 17, but if the workpiece 1 can be set without detaching or moving the upper support part 16, the upper support part 16 and the lower support part 17 may be integrated. Possible methods for setting the workpiece 1 without detaching or moving the upper support part 16 include retracting the tailstock 4 and carriage 6 to the end of the bed 2, moving the workpiece 1 horizontally from the lateral direction of the bed 2 so that it is positioned close to the upper support 18 and lower support 19, and holding the workpiece 1 with the headstock 3 and tailstock 4, or making it possible to retract the headstock 3 or tailstock 4 laterally relative to the bed 2, moving the workpiece 1 horizontally from the longitudinal direction of the bed 2 so that it is positioned close to the upper support 18 and lower support 19, and returning the headstock 3 or tailstock 4 to the bed 2 so that the workpiece 1 is held with the headstock 3 and tailstock 4. [Explanation of symbols]

[0022] 1 Workpiece 2 Bed 3 Headstock 4 Tailstock 5 Tool rest 6 Carriage 7 Pass-through type steady rest 8, 8' Sliding plane 8 One sliding plane 8' Other sliding plane 9, 9' Two sliding guides 9 One sliding guide 9' The other sliding guide 10 Clamp groove 11 Auxiliary rail 12 Tenon-shaped protrusion 13 clamping member 14 bolt 15 auxiliary engagement portion 16 Upper support part 17 Lower support part 18 Upper support part 19 Lower support 20 Screw hole

Claims

1. A lathe including a bed, a headstock fixed to one end of the bed, a tailstock movable and fixed on the bed, a carriage mounted with a tool rest and movable on the bed, and a pass-through type steady rest that can pass the carriage on the bed, The bed is provided with two parallel sliding guides having a bed sliding surface on the upper surface, and a clamp groove or a protrusion on the side surface for guiding the pass-through type steady rest, The carriage is movable between the two sliding guides while contacting one side of the bed sliding surface and one side of the other bed sliding surface, The pass-through type steady rest can move while contacting the other side of the other bed sliding surface, a steady rest support portion is provided on an upper portion of the pass-through type steady rest, the steady rest support portion supporting the vicinity of the longitudinal center of the workpiece that is held by the headstock and tailstock and that is to be machined by the tool rest; A clamping device is provided at the bottom of the pass-through type steady rest, which engages with the clamp groove or the protrusion and fixes the pass-through type steady rest at any position. A lathe equipped with a pass-through type steady rest, characterized in that:

2. The vibration-preventing support part is composed of a lower support part that supports the lower side of the workpiece, and an upper support part that supports the upper side of the workpiece and is detachable or movable relative to the lower support part. A lathe equipped with the pass-through type steady rest according to claim 1.

3. The bed is provided with an auxiliary rail on a side surface for guiding the pass-through type steady rest in the longitudinal direction of the bed, The pass-through type steady rest has an auxiliary engagement portion that engages with the auxiliary rail and is movable in the longitudinal direction of the bed. A lathe equipped with the pass-through type steady rest according to claim 1 or 2.

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