A tool bar for machining inner curved surface and a common lathe using the tool bar

Abstract

The present invention provides a tool bar for processing inner arc surface and a common lathe using the same, comprising a center bar, one end of which is provided with a first hinge joint; a swing bar, one end of which is provided with a second hinge joint, and the second hinge joint is rotatably connected to the first hinge joint, and the connection between the first hinge joint and the second hinge joint coincides with the sphere center where the inner arc surface is located; a tool body fixing part, which is placed at the end of the swing bar away from the center bar, and the swing bar is rotatably connected with a traction rod; the traction rod is installed on the tool holder of the lathe, and the center bar is installed on the tailstock. The present invention adopts the center bar and the swing bar to be hinged to each other, and by fixing the center bar, the tool holder is pulled outward, so that the end of the swing bar moves along an arc trajectory during movement, and as the workpiece rotates on the lathe spindle, the end of the workpiece is processed into an inner arc surface.

Description

Technical Field

[0001] The invention belongs to the field of mechanical processing, and in particular relates to a tool rod for processing an inner arc surface and a common lathe using the tool rod. Background Art

[0002] In the process of manufacturing with ordinary lathes, if it is necessary to cut an inner arc on the end face, it will test the workers' proficiency in using the lathe and the skills of coordinating the operation of the turning tool with both hands. For ordinary workers, it is easy to cause the movement of the turning tool on the X-axis and Y-axis to be inconsistent during the processing, resulting in insufficient workpiece processing accuracy and waste.

[0003] In order to facilitate the adjustment of the tool rod length, the existing tool rods for installation on ordinary lathes are mostly connected by multiple sections of tool rods through threaded connections or the like. However, due to the gaps between the teeth that are threaded together, the end of the tool rod is subjected to force during the actual cutting process, causing the teeth to be squeezed against each other, shortening the overall length of the tool rod, resulting in a change in the actual length of the tool rod and the length adjusted before processing, affecting the processing accuracy. Summary of the invention

[0004] In view of this, the present invention aims to provide a tool bar for machining inner arc surfaces to improve machining accuracy.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A tool bar for processing an inner arc surface, comprising a central rod and a swing rod hinged to each other, and the swing rod comprises a first connecting section and a second connecting section, an adjustment mechanism is arranged between the first connecting section and the second connecting section, a first stud and a second stud extend from the ends of the first connecting section and the second connecting section, the adjustment mechanism comprises a sleeve, and an adjustment ring fixedly arranged at both ends of the sleeve, the outer edges of the two adjustment rings are respectively fixedly connected to the two ends of the sleeve, and the inner sides are respectively screwed to the first stud and the second stud, the ends of the first stud and the second stud are respectively fixedly connected to a butting plate, the first stud and the second stud are respectively sleeved with springs, one end of the spring abuts against the butting plate, and the other end abuts against the adjustment ring;

[0007] A traction rod is rotatably connected to the swing rod.

[0008] Furthermore, an end bearing is fixedly provided on one side of the abutting plate close to the first stud or the second stud, and the end of the spring abuts against the end bearing.

[0009] Furthermore, the threads on the first stud and the second stud have opposite directions of rotation.

[0010] Furthermore, a knife body fixing portion is provided at one end of the swing rod away from the center rod, and the knife body fixing portion includes a limiting surface and a fastening bolt. The limiting surface is parallel to the plane where the swing rod rotates. The fastening bolt passes through the limiting surface, and a locking nut is screwed on the end of the fastening bolt.

[0011] Furthermore, the plane where the traction rod rotates and the plane where the swing rod rotates are parallel to each other, and an avoidance section is left between the traction rod and the fixed part of the blade body.

[0012] Furthermore, a first hinged joint is fixedly provided at the end of the central rod, and a second hinged joint is fixedly provided at the end of the swing rod, and the first hinged joint and the second hinged joint are rotatably connected.

[0013] A common lathe comprises a tailstock, a machine head, a tool holder and the tool bar for processing inner arc surface, wherein the center bar is fixed on the tailstock, the tailstock can be close to or away from the machine head, and a smooth bar is arranged between the machine head and the tailstock;

[0014] The middle carriage is placed between the tailstock and the machine head, and the middle carriage can move in a horizontal plane along a direction perpendicular to the axis of the optical bar, and the middle carriage can move along the length direction of the optical bar, and the tool holder is fixed on the middle carriage.

[0015] Furthermore, the common lathe also includes a large slide, which is slidably connected to the light bar, and the middle slide is placed on the large slide.

[0016] Furthermore, a lead screw is rotatably connected to the middle of the large drag plate, a lead nut is fixedly provided at the bottom of the middle drag plate, and the lead screw is threadedly connected to the lead screw.

[0017] Compared with the prior art, the tool bar for machining inner arc surface described in the present invention has the following advantages:

[0018] The present invention adopts two springs and abutment plates to cooperate with each other, respectively pushing the first connection section and the second connection section toward the inside of the sleeve, so that the threads of the first stud and the second stud and the threads of the adjustment ring are always in a mutually squeezed state, thereby preventing the processing accuracy from being low after adjustment due to loose thread cooperation;

[0019] End bearings are used to avoid wear on the spring ends during rotation.

[0020] An ordinary lathe with no screw restriction on the large slide is used, so that during the processing, the worker only needs to control the position of the middle slide to make the large slide change its position with the movement of the swing rod, reducing the operating difficulty of the worker. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 Schematic diagram of the overall structure of the tool bar;

[0023] Figure 2 It is an exploded schematic diagram of the tool bar structure;

[0024] Figure 3 It is a cross-sectional view of the internal structure of the tool bar;

[0025] Figure 4 It is a schematic diagram of the structure of the fixed part of the cutter body;

[0026] Figure 5 Schematic diagram of the connection structure between the lathe and the tool rod.

[0027] Description of reference numerals:

[0028] 1-center rod; 11-first hinge joint; 2-swing rod; 21-first connecting section; 211-first stud; 22-second connecting section; 221-second stud; 23-second hinge joint; 24-adjusting mechanism; 241-sleeve; 242-adjusting ring; 2421-screw hole; 2422-top screw; 243-top plate; 25-spring; 26-tool fixing part; 261-limiting surface; 262-fastening bolt; 263-fastening nut; 27-avoidance section; 28-connecting groove; 29-end bearing; 3-traction rod; 31-connecting part; 4-machine tool; 41-machine head; 42-tailstock; 43-light bar; 44-large slide plate; 45-middle slide plate; 46-screw; 47-tool holder. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0033] The tool bar for processing inner arc surface of the present invention comprises a central rod 1 and a swing rod 2 which are hinged to each other, and the swing rod 2 comprises a first connecting section 21 and a second connecting section 22, and an adjustment mechanism 24 is provided between the first connecting section 21 and the second connecting section 22 to adjust the distance between the first connecting section 21 and the second connecting section 22, and a tool body fixing portion 26 is provided at one end of the swing rod 2, and a second hinge joint 23 is fixedly provided at the other end, and a first hinge joint 11 is fixedly provided at the end of the central rod 1, and the first hinge joint 11 and the second hinge joint 23 are rotatably connected; the tool body is fixed The fixed part 26 includes, the knife body fixing part 26 includes a limiting surface 261 and a fastening bolt 262, the limiting surface 261 is parallel to the plane where the swing rod 2 rotates, the fastening bolt 262 passes through the limiting surface 261, and a locking nut is screwed on the end of the fastening bolt 262. During the installation of the tool, the fastening bolt 262 is used to pass through the tool head or tool rod and other parts of the tool, and then the body is fixed by the locking nut. Specifically, the second hinged head 23 is fixed at the end of the second connecting section 22, and the knife body fixing part 26 is fixed at the end of the first connecting section 21.

[0034] In order to adjust the spacing between the first connecting section 21 and the second connecting section 22, a first stud 211 and a second stud 221 are extended from the ends of the first connecting section 21 and the second connecting section 22. The adjusting mechanism 24 includes a pipe sleeve and an adjusting ring 242 fixedly arranged at both ends of the pipe sleeve. The outer edges of the two adjusting rings 242 are respectively fixedly connected to the two ends of the pipe sleeve, and the inner sides are respectively screwed with the first stud 211 and the second stud 221. The ends of the first stud 211 and the second stud 221 are respectively fixedly connected to a resisting plate 243. The first stud 211 and the second stud 221 are respectively sleeved with a spring 25. One end of the spring 25 resists against the resisting plate 243, and the other end resists against the adjusting ring 242. During use, the spring 25 is tightly pressed against the resisting plate 243 and the adjusting ring 242, so that the first connecting section 21 and the second connecting section 22 are subjected to a force into the sleeve 241. The threads of the adjusting ring 242 and the threads of the first stud 211 or the second stud 221 are always in a close contact with each other. Before and after the first connecting section 21 and the second connecting section 22 are adjusted, the two adjusting rings 242 and the first stud 211 or the second stud 221 will not move due to the gap between the screw teeth. During the processing, the tool tip is subjected to an extrusion force in the direction of the tool rod. Therefore, the length of the swing rod 2 after adjustment is the same as the length of the swing rod 2 during the processing. In order to prevent the spring 25 from being unevenly stressed in the sleeve 241 during the adjustment process, causing the spring 25 to twist and change the strength of the spring 25, an end bearing 29 is fixedly provided on the side of the abutting plate 243 close to the first stud 211 or the second stud 221, and the end of the spring 25 abuts against the end bearing 29. In order to facilitate quick adjustment, the threads on the first stud 211 and the second stud 221 are rotated in opposite directions.

[0035] In order to facilitate the positioning of the sleeve 241 and the first connecting section 21 and the second connecting section 22, a screw hole 2421 is opened on the adjusting ring 242, and the center hole of each adjusting ring 242 is connected to the outside through the screw hole 2421. A top screw 2422 is screwed with the screw hole 2421, and the inner end of the top screw 2422 can be tightly against the first stud 211 or the second stud 221.

[0036] The swing rod 2 is also rotatably connected to a traction rod 3. Specifically, the traction rod 3 and the swing rod 2 rotate in the same plane. In order to ensure that the traction rod 3 is stably connected to the swing rod 2 and facilitate the processing and positioning of the swing rod 2, a connecting groove 28 is opened on the swing rod 2. A U-shaped connecting portion 31 is provided at one end of the traction rod 3. The swing rod 2 is placed in the U-shaped connecting portion 31, and bolts pass through the connecting portion 31 and the swing rod 2. The swing rod 2 is rotatably connected to the connecting portion 31. In order to make the traction rod 3 rotate in the connecting groove 28, the length of the connecting groove 28 is greater than the width of the U-shaped connecting portion 31, and the cross-section of the main part of the traction rod 3 is square.

[0037] Based on the above-mentioned tool rod, an ordinary lathe is modified, which includes a tailstock 42 and a machine head 41, and a smooth bar 43 is provided between the tailstock 42 and the machine head 41. A large slide plate 44 is slidably connected to the smooth bar 43, so that the large slide plate 44 can move along the smooth bar 43, and at the same time, the large slide plate 44 can freely make reciprocating movements between the tailstock 42 and the machine head 41. A middle slide plate 45 is provided on the large slide plate 44, and the middle slide plate 45 is slidably connected to the large slide plate 44, and the movement direction of the middle slide plate 45 is perpendicular to the movement direction of the large slide plate 44. A tool seat 47 is fixed on the middle slide plate 45, and a lead screw 46 is rotatably connected to the middle part of the large slide plate 44. A lead screw nut is fixed at the bottom of the middle slide plate 45, and the lead screw nut is screwed to the lead screw 46. A hand wheel is provided at the end of the lead screw 46 to facilitate the worker to control the rotation of the lead screw 46.

[0038] During the working process, the length of the tool rod is first adjusted according to the length of the inner arc surface to be processed by rotating the adjusting screw sleeve, so that the distance between the tool tip and the second hinged joint 23 is the same as the length of the inner arc surface to be processed. Then, the center rod 1 is fixed to the tailstock 42 of the machine tool 4, the workpiece is fixed to the chuck of the machine head 41, and the traction rod 3 is fixed to the tool holder 47. Finally, the spindle workpiece is controlled to rotate, and the processing depth is controlled by the distance between the tailstock 42 and the chuck. The processing feed is controlled by operating the middle slide 45 to move outward, and during the movement of the middle slide 45, the end of the swing rod 2 moves in an arc, causing the large slide 44 to move along the main axis of the lathe.

[0039] Those skilled in the art should know that in order to install the adjustment ring 242 on the sleeve 241, a through hole is opened at the edge of the adjustment ring 242, and a screw hole 2421 is opened at the end of the sleeve 241. The adjustment ring 242 can be installed on the sleeve 241 by bolts. In order to install the top plate on the first stud 211 or the second stud 221, a through hole is opened in the middle of the top edge, and a screw hole 2421 is opened along the axis in the middle of the stud. The stop plate and the first stud 211 or the second stud 221 are fixed and installed by bolts.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tool bar for machining inner curved surface, characterized in that: The invention comprises a central rod (1) and a swing rod (2) which are hinged to each other, wherein the swing rod (2) comprises a first connecting section (21) and a second connecting section (22), an adjusting mechanism (24) is arranged between the first connecting section (21) and the second connecting section (22), a first stud (211) and a second stud (221) extend from the ends of the first connecting section (21) and the second connecting section (22), and the adjusting mechanism (24) comprises a pipe sleeve and an adjusting ring (24) fixed at both ends of the pipe sleeve. 2), the outer edges of the two adjusting rings (242) are respectively fixedly connected to the two ends of the pipe sleeve, and the inner sides are respectively screwed to the first stud (211) and the second stud (221), the ends of the first stud (211) and the second stud (221) are respectively fixedly connected to a push plate (243), and the first stud (211) and the second stud (221) are respectively sleeved with a spring (25), one end of the spring (25) pushes against the push plate (243), and the other end pushes against the adjusting ring (242); The traction rod (3) is rotatably connected to the swing rod (2).

2. The tool bar for machining inner curved surface according to claim 1, characterized in that: An end surface bearing is fixedly arranged on one side of the abutting plate close to the first stud or the second stud, and the end of the spring abuts against the end surface bearing.

3. The tool bar for machining inner curved surface according to claim 1, characterized in that: The threads on the first stud and the second stud are in opposite directions.

4. The tool bar for machining inner curved surface according to claim 1, characterized in that: A knife body fixing part is provided at one end of the swing rod away from the center rod, and the knife body fixing part includes a limiting surface and a fastening bolt. The limiting surface is parallel to the plane where the swing rod rotates. The fastening bolt passes through the limiting surface, and a locking nut is screwed on the end of the fastening bolt.

5. The tool bar for machining inner curved surface according to claim 1, characterized in that: The plane where the traction rod rotates and the plane where the swing rod rotates are parallel to each other, and an avoidance section is left between the traction rod and the fixed part of the cutter body.

6. The tool bar for machining inner curved surface according to claim 5, characterized in that: A connecting groove is provided on the swing rod, a U-shaped connecting portion is provided at one end of the traction rod, the swing rod is placed in the U-shaped connecting portion, and the swing rod is rotatably connected to the connecting portion.

7. The tool bar for machining inner curved surface according to claim 1, characterized in that: A first hinged joint is fixedly arranged at the end of the central rod, and a second hinged joint is fixedly arranged at the end of the swing rod. The first hinged joint is rotatably connected with the second hinged joint.

8. A common lathe, characterized in that: The invention comprises a tool bar, a tailstock (42), a machine head (41) and a tool holder (47) as claimed in any one of claims 1 to 7, wherein the center bar (1) is fixed on the tailstock (42), the tailstock (42) can be close to or away from the machine head (41), and a light bar (43) is provided between the machine head (41) and the tailstock (42); A middle carriage (45) is arranged between the tailstock (42) and the machine head (41), and the middle carriage (45) can move in a horizontal plane along a direction perpendicular to the axis of the optical bar (43), and the middle carriage (45) can move along the length direction of the optical bar (43), and the knife holder (47) is fixed on the middle carriage.

9. A common lathe according to claim 8, characterized in that: It also includes a large carriage which is slidably connected to the light bar, and the middle carriage is placed on the large carriage.

10. A common lathe according to claim 9, characterized in that: A lead screw is rotatably connected to the middle of the large drag plate, and a nut is fixedly arranged at the bottom of the middle drag plate, and the nut is threadedly connected to the lead screw.

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