Railway axle machining driving device

Abstract

The utility model discloses a railway axle machining driving device which comprises a faceplate and a pulling head bolt, an ejector pin is arranged in the center of the faceplate, the ejector pin is matched with a center hole in the axle end, a threaded sleeve is connected outside the ejector pin in a sleeved mode, and three clamping grooves are evenly formed in the threaded sleeve with the ejector pin as the center. The pulling head bolt comprises a threaded end and a clamping end, the threaded end corresponds to a screw hole of an axle, the clamping end is matched with the clamping groove, and the original mode that one end is tightly jacked by a tip and the other end is clamped by a clamping jaw (hereinafter collectively referred to as'jacking and clamping ') is changed into'double-tip' positioning. A machine tool chuck is replaced by designing and manufacturing a faceplate (with a groove), meanwhile, a stirring bolt is installed through a shaft end screw hole, the head of the bolt is clamped into a faceplate sliding groove, and therefore the requirement for axle cutting is met through spindle torque transmitted by the faceplate.

Description

Technical Field

[0001] The utility model relates to a railway axle processing drive device. Background Art

[0002] In existing axle machining processes, when machining the outer cylindrical surface of an axle using a conventional CNC lathe, the center hole at the shaft end is used as the positioning reference. The machine's dual centers are used for clamping (to ensure coaxiality during machining), and a four-jaw (or three-jaw) chuck is used to clamp the axle journal. This transmits the machine's spindle power to machine the entire outer surface of the axle. The existing "one-climb, one-clamp" drive method is limited by the clamping position of the spindle chuck's jaws, and tool interference affects machining, making it impossible to complete the entire outer surface of the axle in a single clamping operation. This necessitates a "secondary lifting" method, where the jaws are turned around and clamped for machining on the other side, impacting machining efficiency. Utility Model Content

[0003] The purpose of the present utility model is to provide a railway axle processing drive device to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a railway axle processing drive device, comprising a faceplate and a head-pulling bolt, wherein a thimble is provided at the center of the faceplate, the thimble is adapted to the center hole of the axle end, a threaded sleeve is sleeved on the outside of the thimble, and three slots are evenly provided on the threaded sleeve centered on the thimble; the head-pulling bolt comprises a threaded end and a clamping end, the threaded end corresponds to the screw hole of the axle, and the clamping end is adapted to the clamping slot.

[0005] Preferably, the threaded sleeve is 30 mm long, has a small taper of 1°, an internal thread of M45*2, and a 3 mm rotating hole at the end; the improved center and the threaded sleeve are combined and installed into the machine tool spindle.

[0006] Compared with the prior art, the beneficial effects of the present invention are:

[0007] 1. Through the secondary transformation of the chuck of the CNC lathe, a self-made drive disc was used to replace the chuck, which solved the problem of interference between the clamping part of the claw and the tool, and achieved the process requirement of "one-time clamping" for machining the entire axis;

[0008] 2. It reduces the workload of employees who frequently manually loosen the chuck, reduces the auxiliary time that the product must be turned around for processing, and improves operating efficiency by 30%;

[0009] 3. Because it adopts the toggle drive mode, it solves the problem of fastening indentations on the processed outer cylindrical surface caused by the original claw clamping mode, and improves the appearance quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1This is a schematic diagram of the flower disc structure;

[0011] Figure 2 This is a schematic diagram of the head bolt plate structure;

[0012] Figure 3 Schematic diagram of the axle structure.

[0013] In the figure: 1 ejector pin, 2 slot, 3 threaded end, 4 snap-on end, 5 center hole, 6 screw hole, 7 threaded sleeve. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] See also Figure 1-3 The utility model provides a technical solution: a railway axle processing drive device, including a faceplate and a head-pulling bolt, a thimble 1 is provided at the center of the faceplate, the thimble 1 is adapted to the center hole 5 of the axle end, the outside of the thimble 1 is sleeved with a threaded sleeve 7, and three slots 2 are evenly provided on the threaded sleeve 7 centered on the thimble 1; the head-pulling bolt includes a threaded end 3 and a clamping end 4, the threaded end 3 corresponds to the screw hole 6 of the axle, and the clamping end 4 is adapted to the clamping slot 2.

[0016] After changing the drive mode, the workpiece positioning method was directly changed to dual-center positioning. This resulted in significant radial forces acting on the machine tool center during the cutting process. The extended spindle center caused significant radial displacement, resulting in significant workpiece runout (tested to be 1mm), compromising machining quality (the process allows for a 0.1mm runout). Therefore, improvements were needed to reduce runout and ensure machining quality. The solution was to machine a 50mm-long M45*2 thread on the front section of the existing center. A special φ59 threaded sleeve with a 30mm length, a 1° taper, an M45*2 internal thread, and a 3mm swivel hole at the end was then fabricated. The modified center and sleeve were then assembled and installed into the machine spindle. By adjusting the threaded sleeve-center engagement length, the gap between the combined center and the drive fixture was eliminated, integrating the center and drive fixture into a single unit, improving strength and reducing machining runout. After clamping, spindle center runout was measured to be 0.04mm, and after workpiece machining, it was 0.05mm, meeting the requirements.

[0017] Faceplate usage: 1. Remove the original chuck of the machine tool and install the faceplate; 2. Firmly insert the self-made shifting bolt into any one or three holes of the axle; 3. When the axle is hoisted on the machine tool, embed the head of the shifting bolt into the faceplate; 4. Start the machine tool and use the forward and reverse cutting tools to process the outer circle of the product.

[0018] The design principle of this utility model is to change the previous method of using a center for tightening at one end and a claw for clamping at the other end (hereinafter referred to as "one center, one clamp") to a "double center" positioning method. By designing and manufacturing a faceplate (with slots) to replace the machine tool chuck, a toggle bolt is installed using the screw hole at the end of the shaft. The bolt head is locked into the faceplate slot, thereby utilizing the spindle torque transmitted by the faceplate to meet the axle cutting needs.

[0019] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A railway axle processing drive device, characterized by: It includes a faceplate and a head-pulling bolt. A thimble is provided at the center of the faceplate, which is adapted to the center hole of the axle end. A threaded sleeve is sleeved on the outside of the thimble, and three slots are evenly arranged on the threaded sleeve centered on the thimble. The head-pulling bolt includes a threaded end and a clamping end. The threaded end corresponds to the screw hole of the axle, and the clamping end is adapted to the slot.

2. The threaded sleeve according to claim 1, wherein: The threaded sleeve is 30mm long, has a small taper of 1°, an internal thread of M45*2, and a 3mm rotating hole at the end; the improved center and the threaded sleeve are combined and installed into the main shaft of the machine tool.

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