Quick positioning device for center hole of shaft blank

Abstract

The utility model discloses a quick positioning device for a center hole of a shaft blank, relates to the technical field of center hole positioning, and aims to solve the problem that the center hole of the forged shaft blank is difficult to quickly and accurately position. The quick positioning device comprises a lathe bed, and a supporting mechanism for supporting the blank is arranged on the lathe bed. A driving device used for driving the blank to rotate is arranged on the supporting mechanism, a positioning mechanism is further connected to the lathe bed in a sliding mode, and a line drawing mechanism and a punching mechanism are arranged on the positioning mechanism.

Description

Technical Field

[0001] This utility model relates to the technical field of center hole positioning, specifically to a rapid positioning device for the center hole of a shaft blank. Background Technology

[0002] When machining shaft blanks, a fixture is generally used to hold the central axis, and then the blank is driven to rotate. The cutting tool contacts the blank during rotation, thereby performing cutting and other machining operations on the blank surface. The positioning of the center hole before blank machining determines the machining accuracy and quality. If the center hole is not accurately positioned and the deviation is large, the machined blank is prone to eccentricity, leading to blank scrap and increasing the scrap rate.

[0003] For forged shaft blanks, the outer circle uniformity is poor. Positioning the center hole is not only time-consuming and laborious, but the center hole is also inaccurate and prone to eccentricity. This leads to a high scrap rate of forged shaft blanks after processing, and the positioning wastes a lot of time, which greatly reduces production efficiency. Utility Model Content

[0004] To address the aforementioned problem of the difficulty in quickly and accurately positioning the center hole of forged shaft blanks, this invention proposes a rapid positioning device for the center hole of shaft blanks. The device includes a bed, on which a support mechanism for supporting the blank is mounted. The support mechanism is equipped with a drive device for rotating the blank. A positioning mechanism is also slidably connected to the bed, and this positioning mechanism includes a marking mechanism and a drilling mechanism.

[0005] A further feature of this invention is that the support mechanism includes a base plate, on which two driving wheels and two driven wheels are mounted. The driving wheels and the driven wheels are respectively disposed on both sides of the billet to support the billet.

[0006] A further feature of this invention is that the two drive wheels are mounted on a rotating shaft, and the rotating shaft is connected to the drive device via a sprocket and chain.

[0007] A further feature of this invention is that the two driven wheels are rotatably connected to an adjusting plate, the adjusting plate has two limiting grooves, the limiting grooves are perpendicular to the rotating shaft, and the base plate is connected to two limiting posts corresponding to the limiting grooves, the limiting posts passing through the limiting grooves to adjust the distance between the driving wheel and the driven wheel.

[0008] A further feature of this invention is that: two adjusting blocks are provided on the adjusting plate, and threaded holes are provided on the adjusting blocks; two ear plates are connected to the base plate corresponding to the adjusting blocks; through holes are provided on the ear plates corresponding to the threaded holes; a pulling bolt is threadedly connected to the threaded holes; the pulling bolt passes through the through holes; and the pulling bolt is parallel to the limiting groove.

[0009] A further feature of this invention is that the drawing mechanism includes a slide rail, which is connected to the positioning mechanism and is perpendicular to the blank. A drawing rod is slidably connected to the slide rail, which is vertically arranged. A drawing device is slidably connected to the drawing rod, and one end of the drawing device is a pointed tip for drawing lines on the blank.

[0010] A further feature of this invention is that: a sleeve is connected to one end of the line marker away from the tip, the sleeve is fitted onto the line marker rod, and a set screw is threaded onto the side wall of the sleeve, with the end of the set screw near the line marker rod abutting against the line marker rod.

[0011] A further feature of this invention is that the drilling mechanism includes a second slide rail, which is connected to the positioning mechanism. The second slide rail is perpendicular to the blank. A mounting box is slidably connected to the second slide rail. A lead screw is threadedly connected to the top of the mounting box. The bottom end of the lead screw extends into the mounting box and is rotatably connected to a drill. The top end of the lead screw is located on the outside of the mounting box.

[0012] A further feature of this invention is that a second lead screw is threadedly connected to the bottom of the mounting box, the second lead screw is arranged parallel to the second slide rail, and both ends of the second lead screw are rotatably connected to the second slide rail through a mounting plate.

[0013] A further feature of this invention is that the mounting box is provided with two vertical guide rods, which are symmetrically arranged about the lead screw, and the two ends of the guide rods are fixedly connected to the top and bottom of the mounting box, respectively. The punch is slidably connected to the guide rods through a guide block.

[0014] The beneficial effects of this utility model are as follows:

[0015] By setting up a drive device, the billet can be driven to rotate. Then, by driving the billet to rotate at different angles multiple times, and after each rotation, a line marking mechanism is used to mark a straight line at one end of the billet. The polygon formed by the intersection of multiple straight lines is the center point of the center hole of the shaft billet. Then, a drilling mechanism is used to drill a hole at the determined center point, which can quickly determine the center hole position of the billet with poor outer circle uniformity. This further solves the problems of time-consuming, labor-intensive, inaccurate, and easily eccentric alignment of shaft forgings on the lathe, improves the accuracy of subsequent processing, and reduces the scrap rate. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of this utility model is shown. Figure 1 .

[0017] Figure 2 A schematic diagram of the structure of this utility model is shown. Figure 2 .

[0018] Figure 3 A schematic diagram of the structure of this utility model is shown. Figure 3 .

[0019] Figure 4 A magnified view of a portion at point A is shown.

[0020] Reference numerals in the attached drawings: 1. Bed; 2. Support mechanism; 21. Base plate; 211. Ear plate; 22. Drive wheel; 23. Drive device; 24. Adjusting plate; 241. Driven wheel; 242. Limiting groove; 243. Adjusting block; 3. Positioning mechanism; 4. Marking mechanism; 41. Slide rail one; 42. Marking rod; 43. Marker; 431. Sleeve; 4311. Set screw; 5. Drilling mechanism; 51. Slide rail two; 52. Mounting box; 53. Lead screw one; 54. Driller; 55. Lead screw two; 56. Guide rod. Detailed Implementation

[0021] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0022] This utility model proposes a quick positioning device for the center hole of a shaft-type billet, including a bed 1, on which a support mechanism 2 for supporting the billet is fixedly installed, and a drive device 23 for driving the billet to rotate is installed on the support mechanism 2. The drive device 23 is a motor. Two parallel guide rails are welded to the upper surface of the bed 1. A positioning mechanism 3 is slidably connected to the bed 1 through the guide rails. The positioning mechanism 3 is an L-shaped plate that is slidably connected to the two guide rails. The drive component of the positioning mechanism 3 adopts the existing saddle drive structure, so it will not be described in detail here.

[0023] The positioning mechanism 3 is equipped with a drawing mechanism 4, which is used to draw marking lines on one end of the blank. The positioning mechanism 3 is also equipped with a drilling mechanism 5, which is used to drill holes in the blank after the center point of the blank is determined.

[0024] The support structure includes a base plate 21, which is fixedly connected to the bed 1. Two drive wheels 22 and two driven wheels 241 are installed on the upper surface of the base plate 21. The drive wheels 22 and driven wheels 241 are respectively arranged on both sides of the billet to contact the side surface of the billet and thus support the billet.

[0025] Two drive wheels 22 are rotatably connected to a single shaft, both ends of which are rotatably connected to a base plate 21 via bearing seats. The shaft is parallel to the billet. An external mounting bracket is welded to the base plate 21. The drive device 23 is fixedly connected to the external mounting bracket by bolts, and the output end of the drive device 23 is connected to the shaft via a sprocket and chain. That is, the drive device 23 can drive the two drive wheels 22 to rotate via the sprocket and chain, and the active rotation can drive the billet to rotate accordingly.

[0026] Two driven wheels 241 are rotatably connected to an adjusting plate 24 via a wheel frame. The adjusting plate 24 is positioned above the base plate 21 and has two limiting grooves 242 arranged in parallel and perpendicular to the rotating shaft. Two limiting posts are welded to the base plate 21 corresponding to the two limiting grooves 242. The limiting posts are vertically positioned, passing through the limiting grooves 242, with their tops extending out of the grooves. Through the cooperation of the two limiting grooves 242 and the two limiting posts, the adjusting plate 24 can slide along the direction of the limiting grooves 242, thereby adjusting the distance between the driving wheel 22 and the driven wheel 241, thus supporting billets of different diameters.

[0027] Two adjusting blocks 243 are welded on the adjusting plate 24. The adjusting blocks 243 have threaded holes. Two ear plates 211 are welded on the base plate 21 corresponding to the two adjusting blocks 243. The ear plates 211 have through holes corresponding to the threaded holes. Pulling bolts are connected to the threads in the threaded holes. The pulling bolts pass through the through holes, that is, the nuts are set on the side of the ear plates 211 away from the threaded holes.

[0028] In use, one pull bolt can be removed first, and then the other pull bolt can be rotated to drive the adjustment plate 24 to move along the direction of the limit groove 242. After the adjustment plate 24 moves to the appropriate position, the other pull bolt can be installed and tightened to further stabilize the adjustment plate 24.

[0029] The marking mechanism 4 includes a slide rail 41, which is bolted to the upper surface of the positioning mechanism 3. The slide rail 41 is perpendicular to the blank. A marking rod 42 is slidably connected to the slide rail 41. The marking rod 42 is vertically arranged. A marking device 43 is slidably connected to the marking rod 42. The end of the marking device 43 away from the marking rod 42 is set as a pointed tip facing the blank for marking lines on the blank.

[0030] A sleeve 431 is welded to one end of the line marker 43 away from the tip. The sleeve 431 is coaxially fitted with the line marker rod 42 and can slide up and down along the sleeve 431. A set screw 4311 is threaded onto the side wall of the sleeve 431. The end of the set screw 4311 near the line marker rod 42 abuts against the line marker rod 42, and the other end of the set screw 4311 is located on the outside of the sleeve 431. The set screw 4311 can be tightened and limited by the sleeve 431. That is, after the height of the line marker 43 is adjusted, it can be fixed by rotating the set screw 4311.

[0031] The punching mechanism 5 includes a second slide rail 51, which is threadedly connected to the upper surface of the positioning mechanism 3. The second slide rail 51 is perpendicular to the blank and is located on the side of the first slide rail 41 away from the support mechanism 2. A mounting box 52 is slidably connected to the second slide rail 51. The mounting box 52 is a rectangular box, with both the end facing the blank and the end away from the blank open.

[0032] The bottom of the mounting box 52 is also threaded with a second lead screw 55, which is parallel to the second slide rail 51 and positioned above it. Both ends of the second lead screw 55 are rotatably connected to the second slide rail 51 via mounting plates. A handwheel is welded to one end of the second lead screw 55. Rotating the second lead screw 55 drives the mounting box 52 to move along the direction of the second slide rail 51.

[0033] The top of the mounting box 52 is threadedly connected to a lead screw 53. The bottom end of the lead screw 53 extends into the interior of the mounting box 52, while the top end of the lead screw 53 is located on the outside of the mounting box 52 and is welded with a handwheel. The bottom end of the lead screw 53 is rotatably connected to a drill 54. The drill 54 is rotatably connected to the lead screw 53 via a rectangular plate. The drill 54 is a drilling machine, and a drill bit is installed at the end near the blank for drilling holes in the blank.

[0034] The mounting box 52 is also equipped with two vertical guide rods 56. The two guide rods 56 are symmetrically arranged about the lead screw 53, and the two ends of the guide rods 56 are fixedly connected to the top and bottom of the mounting box 52 respectively. Two sliders are welded on the rectangular plate on which the punch 54 is installed. The two sliders are slidably connected to the two guide rods 56 respectively, thereby realizing the sliding connection between the punch 54 and the guide rods 56.

[0035] Usage process: First, support the billet on the driving wheel 22 and the driven wheel 241. Then, through the sliding positioning mechanism 3, make the tip of the line marker 43 abut against the top of the billet, and then draw a straight line. Then slide the positioning mechanism 3 to move the line marker 43 away from the billet.

[0036] Next, the drive device 23 is activated, driving the drive wheel 22 to rotate, which in turn causes the billet to rotate at a certain angle. Then, the sliding positioning mechanism 3 is used to bring the tip of the line marker 43 into contact with the top of the billet, and a straight line is drawn. Then, the sliding positioning mechanism 3 is used to move the line marker 43 away from the billet. The above process is repeated at least three times, and then the multiple lines drawn can form a polygon.

[0037] Finally, based on geometric relationships, the center point of the polygon is found, which is the center point of the blank. At this point, the drawing rod 42 is slid to a position where it will not interfere with the blank, and the positioning mechanism 3 is driven so that the punch 54 is against the blank. Then, the lead screw 1 53 and lead screw 2 55 are used to adjust the punch 54 so that it is against the center point. The punch 54 is then turned on, and the center hole is punched on the blank.

[0038] In summary, this utility model, by setting up a driving device 23, can achieve the purpose of driving the billet to rotate. Then, by driving the billet to rotate at different angles multiple times, and after each rotation angle, a straight line is drawn on one end of the billet using a marking mechanism 4. The polygon formed by the intersection of multiple straight lines is the center point of the polygon, which is the position of the center hole of the shaft billet. Then, the center point is drilled by a drilling mechanism 5, which can quickly determine the position of the center hole of the billet with poor outer circle uniformity. This further solves the problems of time-consuming, labor-intensive, inaccurate, and easily eccentric alignment of shaft forgings on a lathe, improves the accuracy of subsequent processing, and reduces the scrap rate.

[0039] Although the present invention has been described with reference to preferred embodiments, various modifications can be made to it and components can be replaced with equivalents without departing from the scope of the present invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0040] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0043] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A quick positioning device for the center hole of a shaft-type blank, characterized in that: It includes a bed (1), on which a support mechanism (2) for supporting the blank is installed, and a drive device (23) for driving the blank to rotate is provided on the support mechanism (2). A positioning mechanism (3) is also slidably connected to the bed (1), and a drawing mechanism (4) and a drilling mechanism (5) are provided on the positioning mechanism (3).

2. The quick positioning device for the center hole of shaft blanks according to claim 1, characterized in that: The support mechanism (2) includes a base plate (21), on which two driving wheels (22) and two driven wheels (241) are mounted. The driving wheels (22) and the driven wheels (241) are respectively arranged on both sides of the billet to support the billet.

3. The quick positioning device for the center hole of shaft blanks according to claim 2, characterized in that: The two drive wheels (22) are mounted on a shaft, which is connected to the drive unit (23) via a sprocket chain.

4. The quick positioning device for the center hole of shaft blanks according to claim 3, characterized in that: The two driven wheels (241) are rotatably connected to the adjusting plate (24). The adjusting plate (24) has two limiting grooves (242) which are perpendicular to the rotating shaft. The base plate (21) has two limiting posts connected to the limiting grooves (242). The limiting posts pass through the limiting grooves (242) to adjust the distance between the driving wheel (22) and the driven wheel (241).

5. The quick positioning device for the center hole of shaft blanks according to claim 4, characterized in that: The adjusting plate (24) is provided with two adjusting blocks (243), and the adjusting blocks (243) are provided with threaded holes. The base plate (21) is connected with two ear plates (211) corresponding to the adjusting blocks (243). The ear plates (211) are provided with through holes corresponding to the threaded holes. A pulling bolt is threaded into the threaded hole. The pulling bolt passes through the through hole and is parallel to the limiting groove (242).

6. The quick positioning device for the center hole of shaft blanks according to claim 1, characterized in that: The drawing mechanism (4) includes a slide rail (41) connected to the positioning mechanism (3). The slide rail (41) is perpendicular to the blank. A drawing rod (42) is slidably connected to the slide rail (41). The drawing rod (42) is vertically arranged. A drawing device (43) is slidably connected to the drawing rod (42). One end of the drawing device (43) is set as a pointed tip for drawing lines on the blank.

7. The quick positioning device for the center hole of shaft blanks according to claim 6, characterized in that: The end of the line marker (43) away from the tip is connected to a sleeve (431), which is sleeved on the line marker rod (42). A set screw (4311) is threaded on the side wall of the sleeve (431), and the end of the set screw (4311) near the line marker rod (42) abuts against the line marker rod (42).

8. The quick positioning device for the center hole of shaft blanks according to claim 1, characterized in that: The punching mechanism (5) includes a slide rail two (51), which is connected to the positioning mechanism (3). The slide rail two (51) is set perpendicular to the blank. A mounting box (52) is slidably connected to the slide rail two (51). A lead screw one (53) is threadedly connected to the top of the mounting box (52). The bottom end of the lead screw one (53) extends into the mounting box (52) and is rotatably connected to a punch (54). The top end of the lead screw one (53) is located on the outside of the mounting box (52).

9. The quick positioning device for the center hole of shaft blanks according to claim 8, characterized in that: The bottom of the mounting box (52) is threaded with a second lead screw (55), which is set parallel to the second slide rail (51), and both ends of the second lead screw (55) are rotatably connected to the second slide rail (51) through a mounting plate.

10. The quick positioning device for the center hole of a shaft blank according to claim 8, characterized in that: The mounting box (52) is also provided with two vertical guide rods (56). The two guide rods (56) are symmetrically arranged about the lead screw (53), and the two ends of the guide rods (56) are fixedly connected to the top and bottom of the mounting box (52) respectively. The punch (54) is slidably connected to the guide rods (56) through the guide block.

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