Forged shaft clamping and correcting device

Abstract

The utility model relates to the technical field of machining machinery, in particular to a clamping and correcting device for forged shafts. Comprising a base, a chuck arranged on the base and a shaft tail ejector pin coaxially arranged relative to the chuck, at least one shaft ejector is arranged between the chuck and the shaft tail ejector pin and comprises a supporting section and a connecting section, an air cavity is formed in the connecting section, and two air guide holes communicated with the air cavity are formed in the outer side of the connecting section; a sliding hole penetrating to the air cavity is downwards formed in the middle of the supporting section, a top shaft rod is slidably connected in the sliding hole, a piston is slidably connected in the air cavity, and the top shaft rod is fixedly connected with the piston; the two air guide holes are respectively communicated with the upper and lower ends of the piston; a double-air-path air guide hole and proportional valve joint control structure is adopted, the air pressure difference between the upper portion and the lower portion of a piston in an air cavity is adjusted in real time, lifting of a top shaft rod responds rapidly, multi-supporting-point high-precision displacement compensation can be achieved at the moment when a chuck stops rotating, coaxiality deviation is rapidly eliminated, mechanical adjusting efficiency is improved, and machining precision is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to processing machinery technical field, concretely relates to a kind of forging shaft clamping correction devices. BACKGROUND

[0002] In the machining field of shaft parts, especially in the finishing process of workpieces such as forged long shafts and crankshafts, how to achieve high-precision clamping and dynamic correction is a long-standing technical problem. Traditional clamping devices mostly use a combination structure of hydraulic chucks and fixed tail seat pins. However, when machining slender shaft parts, the workpiece weight, cutting force, and centrifugal force can easily cause bending deformation, resulting in coaxiality deviation and excessive radial runout. Although adjustable auxiliary support devices exist in the prior art, they generally use mechanical screw jacks or hydraulic cylinder driving structures, which have the problems of large response delay and difficulty in coordinated adjustment of multiple support points. SUMMARY

[0003] I. Technical problems to be solved

[0004] The utility model aims to provide a kind of forging shaft clamping correction device, can quickly respond to the position of fine-tuning forged shaft, improve machining precision.

[0005] II. Technical solutions

[0006] The utility model realizes by the following technical solutions:

[0007] The utility model provides a kind of forging shaft clamping correction device, including base, chuck being set on base, shaft tail pin being coaxially arranged relative to chuck, at least one top shaft device is arranged between the chuck and shaft tail pin, the top shaft device includes the support section in upper part, and the connecting section is connected below the support section, gas cavity is arranged in the connecting section, two gas guide holes are opened on the outer side and communicated with the gas cavity, the sliding hole that passes through to the gas cavity is opened downward in the middle of the support section, the top shaft rod is slidably connected in the sliding hole, the piston is slidably connected in the gas cavity, and the top shaft rod is fixedly connected with the piston;Two gas guide holes are respectively communicated with the upper and lower ends of the piston.

[0008] Further, a main gas pipe is arranged on the base, a plurality of proportional valves are arranged on the main gas pipe, and the main gas pipe is communicated with the gas guide hole through the proportional valve.

[0009] Further, symmetric protrusions are formed on the upper sides of the support section, and the two protrusions are formed in arc shape to stably support below the shaft.

[0010] Further, a rotating groove is vertically arranged in the protrusion and is communicated with the sidewall of the rotating groove, and the clamping arm and the rotating groove are dampenedly connected through the rotating shaft with torsional spring.

[0011] Further, the base is provided with a sliding rail in the axial direction, and a support is slidably connected to the sliding rail.

[0012] Further, the support is further fixedly connected with an arc-shaped supporting plate, and a supporting height of the forged shaft is not higher than a clamping height of the chuck.

[0013] III. Advantages

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model discloses a double-gas-path air guide hole and proportional valve joint control structure are used, the real -time adjustment gas pressure difference of piston in gas cavity makes the top axle rod lift quick response, can realize high -precision displacement compensation of multiple support points in the moment of chuck stop, removes the coaxiality deviation quickly, promotes mechanical regulation efficiency, guarantees the machining precision. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the three-dimensional structure schematic diagram of the utility model;

[0017] Fig. 2 It is the structure schematic diagram of the top axle device;

[0018] Fig. 3 It is the perspective structure diagram of the top axle device;

[0019] 1, base;2, chuck;3, shaft tail center pin;4, top axle device;41, support section;411, sliding hole;412, protruding portion;413, rotation groove;42, connecting section;421, gas cavity;422, air guide hole;43, top axle rod;44, piston;45, clamping arm;5, main gas pipe;6, proportional valve;7, sliding rail;8, support;9, arc-shaped supporting plate. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following is in combination with the drawings and examples, and the utility model is further described in detail.It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0021] A kind of forged shaft clamping correction device, please refer to Figs. 1-3 Including base 1, chuck 2 being set on base 1, shaft tail center pin 3 being coaxially arranged relative to chuck 2, chuck 2 is hydraulic or pneumatic drive, and three-jaw or four-jaw chuck 2 can be automatically clamped and loosened, shaft tail center pin 3 is clamped to another end of shaft class parts by center, forms stable support.

[0022] At least one top shaft device 4 (usually two to three, arranged at different positions of the long shaft to form support) is arranged between the chuck 2 and the shaft tail center pin 3. The top shaft device 4 comprises a support section 41 at the upper part, and a connecting section 42 connected below the support section 41, the connecting section 42 is provided with a gas cavity 421, and two gas guide holes 422 are formed on the outer side and communicated with the gas cavity 421, a sliding hole 411 is formed in the middle of the support section 41 and communicated with the gas cavity 421, a top shaft rod 43 is slidably connected in the sliding hole 411, a piston 44 is slidably connected in the gas cavity 421, and the top shaft rod 43 is fixedly connected with the piston 44; the two gas guide holes 422 are respectively communicated with the upper and lower ends of the piston 44.

[0023] The top of the top shaft rod 43 is provided with a replaceable ceramic gasket to reduce the scratch of the shaft surface.

[0024] The forged shaft is supported above the top shaft device 4, high-pressure gas is introduced into the gas guide holes 422, and the up-and-down movement of the piston 44 and the top shaft rod 43 is realized by adjusting the pressure difference between the upper and lower sides of the piston 44; during clamping and processing the forged shaft, the chuck 2 is rotated to adjust the processing surface of the forged shaft, and the positional information of the forged shaft is detected by a detection sensor, such as the deflection displacement or the coaxiality change of the forged shaft during processing, the chuck 2 is stopped, and the top shaft rods 43 of the plurality of top shaft devices 4 can be adaptively driven at different positions below the forged shaft to quickly adjust the flatness and positioning accuracy of the shaft, thereby ensuring the processing accuracy.

[0025] A main gas pipe 5 is arranged on the base 1, a plurality of proportional valves 6 (accuracy ±0.01MPa) are arranged on the main gas pipe 5, and the main gas pipe 5 is communicated with the gas guide holes 422 through the proportional valves 6. The two gas guide holes 422 of a single top shaft device 4 form a double-path gas control channel, the pressure difference between the upper and lower chambers of the piston 44 is dynamically adjusted by a PID algorithm, the response time is not higher than 50ms, and the coaxiality and positioning accuracy of the forged shaft during processing are quickly responded and adjusted.

[0026] In the embodiment, symmetrical protruding portions 412 are formed on both sides above the support section 41, and an arc shape is formed between the two protruding portions 412 to stably support below the shaft. A rotating groove 413 is vertically formed in the protruding portion 412 and communicated with the shaft, and the clamping arm 45 is rotatably connected with the side wall of the rotating groove 413 through a rotating shaft with a torsional spring, and the torsional spring provides a self-adaptive righting force for the clamping arm 45. The forged shaft is stably supported through the arc structure of the clamping arm 45 and the protruding portion 412.

[0027] In addition, a slide rail 7 is arranged on the base 1 in the axial direction, a bracket 8 is slidably connected on the slide rail 7, and the top shaft device 4 is fixedly connected on the bracket 8. By sliding the bracket 8, the position of the base 1 can be adjusted, and then the support position of the top shaft device 4 supporting the forged shaft can be adjusted.

[0028] The support 8 is further fixedly connected with an arc-shaped supporting plate 9, the arc-shaped supporting plate 9 is used for placing a forged shaft, the supporting height of the arc-shaped supporting plate 9 is not higher than the clamping height of the chuck 2, the arc-shaped supporting plate 9 provides temporary auxiliary support, especially for large crankshafts, the arc-shaped supporting plate 9 and the chuck 2 form a stepped support, so that the large crankshaft clamping and bearing distribution are more reasonable, and the radial load of the chuck 2 is reduced.

[0029] The above-described embodiments are merely preferred embodiments of the present application, and are not intended to limit the concept and scope of the present application. Various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art without departing from the design concept of the present application shall fall within the protection scope of the present application, and the technical content of the present application claimed for protection has been fully recorded in the claims.

Claims

1. A clamping and straightening device for forged shafts, comprising a base, a chuck disposed on the base, and a shaft tail ejector pin coaxially disposed relative to the chuck, characterized in that, At least one top shaft device is provided between the chuck and the tail pin. The top shaft device includes a support section at the top and a connecting section connected to the bottom of the support section. The connecting section has an air chamber and two air guide holes communicating with the air chamber on its outer side. The support section has a sliding hole extending downward to the air chamber in the middle. A top shaft rod is slidably connected in the sliding hole. A piston is slidably connected in the air chamber. The top shaft rod is fixedly connected to the piston. The two air guide holes are respectively connected to the upper and lower ends of the piston.

2. The forging shaft clamping and correction device according to claim 1, characterized in that, The base is provided with a main air pipe, and the main air pipe is provided with several proportional valves. The main air pipe is connected to the air guide hole through the proportional valves.

3. A forging shaft clamping and correction device according to claim 1 or 2, characterized in that, Symmetrical protrusions are formed on both sides above the support section, and an arc shape is formed between the two protrusions to provide stable support below the shaft.

4. The forging shaft clamping and correction device according to claim 3, characterized in that, The protrusion has a rotating groove perpendicular to the axial direction, and the clamping arm is rotatably connected to the side wall of the rotating groove through a rotating shaft with torsion spring damping.

5. The forging shaft clamping and correction device according to claim 1, characterized in that, A slide rail is provided on the base along the axial direction, and a bracket is slidably connected to the slide rail. The top shaft is fixedly connected to the bracket.

6. The forging shaft clamping and correction device according to claim 5, characterized in that, The bracket is also fixedly connected to an arc-shaped support plate, the support height of which the forging shaft is placed on the arc-shaped support plate is not higher than the clamping height of the chuck.

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