Lathe knurling device for slender shaft piece

Abstract

A lathe knurling device for slender shafts comprises a lathe, a three-jaw chuck and knurling wheels, the three-jaw chuck is connected with a spindle of the lathe, knurling wheel mounting grooves are formed in the positions, close to the front ends, of the inner sides of three jaws of the three-jaw chuck in the radial outer side in a sunken mode, and positioning pin holes corresponding to each other in position are formed in the front end wall and the rear end wall of each knurling wheel mounting groove. A knurl wheel is arranged in the knurl wheel installation groove, a locating pin penetrates through the locating pin hole and the knurl wheel middle installation hole to install the knurl wheel in the knurl wheel installation groove, and the lathe knurl device further comprises an end locating device arranged on a middle carriage at the front end of the three-jaw chuck. By the adoption of the structure, knurling can be rapidly completed on the surface of the slender shaft piece, the slender shaft piece is not prone to bending, and the product quality can be effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a device for knurling the surface of a metal long shaft. Background Art

[0002] Currently, the most common method for knurling long shafts is to position the shaft in a lathe's three-jaw chuck, mount a knurling wheel on a toolholder on the workbench, and rotate the lathe spindle to emboss the pattern on the shaft's surface. This existing method is generally only suitable for long shafts with large diameters and good rigidity. When knurling smaller, less rigid shafts using this existing method, the knurling wheel can easily bend the workpiece, reducing the product's pass rate. Summary of the Invention

[0003] The purpose of the present utility model is to address the defects of the above-mentioned prior art and to provide a lathe knurling device for slender shaft parts, which can quickly complete knurling processing on the surface of the slender shaft parts, and the slender shaft parts are not easy to bend, which can effectively ensure product quality.

[0004] The technical solution adopted by the utility model to achieve the above-mentioned purpose is: a lathe knurling device for a slender shaft, comprising a lathe, a three-jaw chuck, and a knurling wheel. The three-jaw chuck is connected to the lathe spindle, and the three jaws of the three-jaw chuck are respectively recessed radially outward at the front end to provide knurling wheel mounting grooves. The front and rear end walls of the knurling wheel mounting groove are provided with positioning pin holes corresponding to each other. The knurling wheel is arranged in the knurling wheel mounting groove. The positioning pin passes through the positioning pin hole and the middle mounting hole of the knurling wheel to install the knurling wheel in the knurling wheel mounting groove. The lathe knurling device also includes an end positioning device arranged on the middle drag plate at the front end of the three-jaw chuck.

[0005] A further technical solution of the present invention is that when the knurling wheel is installed in the knurling wheel installation groove, its outer surface protrudes from the inner end surface of the claw.

[0006] A further technical solution of the present utility model is: the end positioning device includes an upper mounting block, a lower mounting block and a clamping block, the lower mounting block is connected to the middle drag plate, the upper mounting block is connected directly above the lower mounting block, and the clamping block is installed between the upper surface of the lower mounting block and the lower surface of the upper mounting block and is locked by bolts.

[0007] A further technical solution of the present utility model is: the clamping block includes a main body and two clamping plates connected in parallel to the rear end of the main body, the main body is arranged between the upper surface of the lower mounting block and the lower surface of the upper mounting block and is locked by bolts, and the middle parts of the opposite surfaces of the two clamping plates are respectively recessed with semicircular positioning grooves, and the outer sides of the positioning grooves of the two clamping plates are respectively provided with connecting holes with corresponding positions. The front end of the slender shaft to be processed is positioned in the positioning grooves of the two clamping plates, and the bolts pass through the connecting holes on the two clamping plates to clamp the end of the slender shaft to be processed.

[0008] The utility model discloses a lathe knurling device for slender shaft parts, which has the following beneficial effects: by improving the three jaws of a three-jaw chuck, a knurling wheel mounting groove is provided on the inner side of each jaw, and a knurling wheel is installed in the knurling wheel mounting groove of each jaw, the slender shaft workpiece to be processed is provided on the inner sides of the three jaws, the front end of the slender shaft workpiece is positioned in the positioning grooves of the two clamping plates at the rear end of the clamping block, the three jaws are tightened to clamp the slender shaft workpiece, the lathe spindle is rotated, the middle slide moves forward to pull the slender shaft workpiece forward, and the knurling wheels on the three jaws emboss patterns on the surface of the slender shaft workpiece. During the embossing process, the slender shaft workpiece and the middle slide make a linear motion together, and the slender shaft workpiece is pressed from the outside to the inside by the three knurling wheels, the force is balanced and it is not easy to be bent, which can effectively ensure product quality.

[0009] The following is a further description of a lathe knurling device for a slender shaft member of the present invention with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic structural diagram of a three-jaw chuck of a lathe knurling device for a slender shaft according to the present invention;

[0011] Figure 2 yes Figure 1 The schematic diagram of the structure of the three-jaw chuck after the knurling wheel is installed;

[0012] Figure 3 yes Figure 2 The schematic diagram of the structure after the three-jaw chuck is connected to the lathe spindle box;

[0013] Figure 4 It is a structural diagram of the clamping block of the end positioning device;

[0014] Figure 5 This is a structural diagram of knurling using a lathe knurling device for slender shafts according to the utility model:

[0015] Figure 6 yes Figure 5 Another direction view;

[0016] Explanation of the accompanying numbers: 1-chuck, 2-claw, 3-knurled wheel mounting groove, 4-locating pin hole, 5-locating pin, 6-knurled wheel, 7-spindle box, 8-slender shaft, 9-clamping block, 10-clamping plate, 11-locating groove, 12-main body, 13-upper mounting block, 14-lower mounting block, 15-middle drag plate, 16-slide rail. DETAILED DESCRIPTION

[0017] like Figures 1 to 6 As shown, the utility model is a lathe knurling device for slender shaft parts, including a lathe, a three-jaw chuck, and a knurling wheel 6. The three-jaw chuck is connected to the lathe spindle. The lathe is an existing general lathe and is not the invention point of the utility model. The lathe structure is not shown in the figure, and the lathe is not described in detail. Figure 5 The direction indicated by the arrow F is forward.

[0018] like Figures 1 to 3 and Figure 5 、 6 As shown, the three-jaw chuck includes a chuck 1 and jaws 2. The chuck 1 adopts the structure of an existing conventional lathe chuck, so the chuck structure will not be described in detail here. The three jaws 2 of the three-jaw chuck are recessed radially outward near the front end to form a knurled wheel mounting groove 3. The radial direction refers to the circumferential direction, and the radial outward direction refers to the circumferential direction. Please also refer to Figure 1 The front and rear end walls of the knurling wheel mounting groove 3 are provided with positioning pin holes 4 corresponding to each other, and the knurling wheel 6 is arranged in the knurling wheel mounting groove 3, as shown. Figure 2 As shown, the locating pin 5 passes through the locating pin hole 4 and the middle mounting hole of the knurling wheel 6 to install the knurling wheel 6 in the knurling wheel mounting groove 3. When the knurling wheel 6 is installed in the knurling wheel mounting groove 3, its outer surface protrudes from the inner end face of the claw 2. When the slender shaft 8 is positioned inside the three claws, the knurling wheel 6 can contact the slender shaft 8 and emboss a pattern on the surface of the slender shaft 8.

[0019] like Figures 4 to 6As shown, the lathe knurling device also includes an end positioning device disposed on the middle carriage 15 at the front end of the three-jaw chuck. The end positioning device includes an upper mounting block 13, a lower mounting block 14, and a clamping block 9. The lower mounting block 14 is connected to the middle carriage 15 via a connecting device. The lower mounting block 14 can slide back and forth on the lathe worktable along with the middle carriage 15. The middle carriage 15 of the lathe and the driving mechanism that drives the movement of the middle carriage 15 are existing structures and their detailed structure is not described here. The upper mounting block 13 is connected directly above the lower mounting block 14. The clamping block 9 is installed between the upper surface of the lower mounting block 14 and the lower surface of the upper mounting block 13 and is locked by bolts. In this embodiment, the clamping block 9 includes a main body 12 and two clamping plates 10 connected parallel to the rear end of the main body 12. During installation, the main body 12 is positioned between the upper surface of the lower mounting block 14 and the lower surface of the upper mounting block 13 and is locked by bolts. The two splints 10 protrude from the rear end of the main body 12, and the middle of the opposite surfaces of the two splints 10 are respectively recessed with semicircular positioning grooves 11, such as Figure 4 As shown, a semicircular positioning groove 11 is provided on the lower surface of the upper clamping plate 10 and the upper surface of the lower clamping plate 10, respectively. The radius of the positioning groove 11 is substantially the same as the radius of the slender shaft 8 to be processed. Connecting holes corresponding to each other are provided on the outer sides of the positioning grooves 11 of the two clamping plates 10. The front end of the slender shaft 8 to be processed is positioned in the positioning grooves 11 of the two clamping plates 10. Bolts pass through the corresponding connecting holes on the two clamping plates 10 to clamp the end of the slender shaft 8 to be processed.

[0020] When working, Figure 5 、 6 As shown, the end positioning device is moved together with the middle slide 15 to the rear end of the workbench near the position of the three-jaw chuck, and the slender shaft 8 to be embossed is set in the center hole of the three-jaw chuck. The front end of the slender shaft 8 extends forward through the three claws 2 and is positioned in the semicircular positioning groove 11 of the two clamping plates 10 of the clamping block 9 of the end positioning device. Then, the bolts and nuts are tightened to clamp the front end of the slender shaft 8, and the three claws 2 are controlled to move inward at the same time to clamp the slender shaft 8. The lathe spindle is controlled to rotate, and the middle slide 15 moves forward to pull the slender shaft 8, and the knurling wheel 6 embosses the pattern on the surface of the slender shaft 8.

[0021] The above embodiments are only preferred embodiments of the present invention. The structure of the present invention is not limited to the forms listed in the above embodiments. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lathe knurling device for a slender shaft, comprising a lathe, a three-jaw chuck, and a knurling wheel (6), wherein the three-jaw chuck is connected to the lathe spindle, and is characterized in that: The three jaws (2) of the three-jaw chuck are respectively provided with knurled wheel mounting grooves (3) on the inner sides thereof, which are recessed radially outwards at the front end positions. The front and rear end walls of the knurled wheel mounting groove (3) are provided with positioning pin holes (4) corresponding to each other. The knurled wheel (6) is arranged in the knurled wheel mounting groove (3). The positioning pin (5) passes through the positioning pin hole (4) and the middle mounting hole of the knurled wheel (6) to mount the knurled wheel (6) in the knurled wheel mounting groove (3). The lathe knurling device further comprises an end positioning device arranged on the middle drag plate (15) at the front end of the three-jaw chuck.

2. A lathe knurling device for an elongated shaft according to claim 1, characterized in that: When the knurled wheel (6) is installed in the knurled wheel installation groove (3), its outer surface protrudes from the inner end surface of the claw (2).

3. A lathe knurling device for an elongated shaft according to claim 1, characterized in that: The end positioning device comprises an upper mounting block (13), a lower mounting block (14) and a clamping block (9), wherein the lower mounting block (14) is connected to the middle drag plate (15), the upper mounting block (13) is connected directly above the lower mounting block (14), and the clamping block (9) is mounted between the upper surface of the lower mounting block (14) and the lower surface of the upper mounting block (13) and is locked by a bolt.

4. A lathe knurling device for an elongated shaft according to claim 3, characterized in that: The clamping block (9) comprises a main body (12) and two clamping plates (10) connected in parallel to the rear end of the main body (12). The main body (12) is arranged between the upper surface of the lower mounting block (14) and the lower surface of the upper mounting block (13) and is locked by bolts. The middle parts of the opposing surfaces of the two clamping plates (10) are respectively recessed with semicircular positioning grooves (11). The outer sides of the positioning grooves (11) of the two clamping plates (10) are respectively provided with connecting holes with corresponding positions. The front end of the slender shaft member (7) to be processed is positioned in the positioning grooves (11) of the two clamping plates (10). The bolts pass through the connecting holes on the two clamping plates (10) to clamp the end of the slender shaft member (7) to be processed.

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