Tail end driving clamp for grinding shaft workpieces

Abstract

The tail end driving clamp comprises a flange, a transmission rod, a transmission block, a driving ring and a plurality of springs, the two ends of the transmission rod are fixedly connected with the flange and the transmission block respectively, the driving ring is fixedly connected with the transmission block, the driving ring and the flange are coaxially arranged, an opening is formed in the driving ring, and the springs are arranged in the opening. A first through hole and a first threaded hole are vertically formed in the two sides of the opening respectively, the locking screw penetrates through the first through hole to be in threaded connection with the first threaded hole, the driving ring is used for tightly holding the tail end of the shaft workpiece, the springs are arranged in the circumferential direction of the driving ring at equal intervals, and the two ends of each spring are connected with the flange and the driving ring respectively. The clamp is used in combination with an existing high-precision center and an existing center frame, can replace a chuck, fix the tail end of a shaft workpiece and drive the shaft workpiece to do rotary motion, can achieve high-precision and high-efficiency clamping of the shaft workpiece, can be widely applied to a grinding machine with a headstock provided with the center, and enables the average grinding machining efficiency of the shaft workpiece to be improved by about 10%.

Description

Technical Field

[0001] The utility model relates to a fixture for machining shaft workpieces, in particular to a tail end driven fixture for grinding shaft workpieces. Background Art

[0002] At present, the common internal hole grinding or end face grinding of shaft workpieces in China usually uses the clamping method of a clamping frame or a double center frame. Among them, the clamping method of the clamping frame clamps the tail end of the workpiece with a chuck and supports the front end of the workpiece with a center frame; the clamping method of the double center frame uses two center frames to support the tail end and front end of the workpiece respectively.

[0003] The commonly used fixtures for grinding shaft workpieces, such as the top, center stand, and chuck, not only have the function of fixing the workpiece, but also need to locate the geometric center of the clamping outer circle (or hole) of the workpiece to the rotating center axis of the machine tool spindle. If the positioning error is too large, it is very likely to cause the precision of the processed workpiece to exceed the tolerance. Among them, the centering accuracy of the top and the center stand is relatively high, but the centering accuracy of the common hydraulic chucks below 12 inches can only be controlled within 0.02mm, and the centering accuracy of the general manual self-centering chuck is even worse.

[0004] For conventional internal grinding machines, the chuck is a disassembled and replaceable accessory, so its rotation accuracy is generally not used as an accuracy test item during machine tool acceptance. When the chuck is installed on the machine tool headstock, its rotation center usually needs to be manually aligned. Due to the error of manual alignment, there is often a deviation between the center axis of the chuck and the rotation center axis of the machine tool spindle.

[0005] Combined with the errors in the centering accuracy and rotation accuracy of the chuck, the positioning accuracy of the workpiece by the clamping method of the clamping frame is poor. In the actual production process, workers usually need to adjust each clamping claw and manually align the rotation center of the workpiece to ensure the positioning accuracy of the workpiece. The manual alignment process is cumbersome, time-consuming and labor-intensive, which increases the labor intensity of workers and also limits production efficiency to a certain extent.

[0006] As for the double center frame clamping method, when processing different workpieces, the centering positions of the two center frames need to be adjusted. The adjustment process is slow, which also limits production efficiency to a certain extent. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a tail-end driven clamp for grinding shaft workpieces in view of the deficiencies in the prior art. The clamp has high positioning accuracy for shaft workpieces and a centering accuracy of less than 0.001 mm. It can achieve high-precision and high-efficiency clamping of shaft workpieces and improve the average grinding efficiency of shaft workpieces by about 10%.

[0008] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a tail end driving clamp for grinding shaft workpieces, comprising a flange, a transmission rod, a transmission block, a driving ring and a plurality of springs, the two ends of the transmission rod are respectively fixedly connected to the flange and the transmission block, the driving ring is fixedly connected to the transmission block, the driving ring and the flange are coaxially arranged, an opening is provided on the driving ring, a first through hole and a first threaded hole are respectively vertically arranged on both sides of the opening, a locking screw passes through the first through hole and is threadedly connected to the first threaded hole, the driving ring is used to clamp the tail end of the shaft workpiece, the plurality of springs are evenly spaced along the circumference of the driving ring, and the two ends of each of the springs are respectively connected to the flange and the driving ring.

[0009] After the tail end of the utility model is driven by the fixture, the flange is fixed on the transition plate of the machine headstock, the driving ring is set on the outer side of the tail end of the shaft workpiece, the locking screw is in a locked state, so that the driving ring tightly embraces the tail end of the shaft workpiece, and the tail end of the shaft workpiece is tightened by the top, and the front end of the shaft workpiece is set and locked on the conventional center frame. Start the machine tool to complete the grinding of the shaft workpiece.

[0010] Compared with the traditional clamping method of the clamping frame, the tail end driving fixture of the utility model can replace the chuck. The positioning of the shaft workpiece is mainly determined by the center. When the fixture is installed on the machine tool headstock, there is no need to perform high-precision centering and alignment work. The preliminary preparation time for processing the workpiece is short. In addition, since the centering accuracy of the center is usually higher than that of the chuck, the positioning accuracy of the shaft workpiece using the tail end driving fixture of the utility model is high. Combined with the precision detection of the center installation hole in the machine tool acceptance inspection project, a higher positioning accuracy of the shaft workpiece can be achieved, and the centering accuracy can reach within 0.001mm. After the shaft workpiece is clamped, there is no need for workers to manually align the rotation center of the workpiece, which improves the processing efficiency. Compared with the clamping method of the double center frame, the tail end driving fixture of the utility model reduces the process of adjusting the centering position of the center frame once, which improves the processing efficiency.

[0011] Preferably, both ends of each spring are hooked on a lifting eye screw and a tensioning screw, the lifting eye screw is threadedly connected to the flange, and the tensioning screw is threadedly connected to the driving ring. The spring transmits and applies tensioning force to the driving ring through the tensioning screw.

[0012] Preferably, the flange is provided with multiple groups of axial threaded holes, each group of axial threaded holes includes multiple axial threaded holes radially arranged outward from the central axis of the flange, each of the eyebolts is threadedly connected to one of the axial threaded holes, and the outer wall of the driving ring is provided with multiple radial threaded holes, each of the radial threaded holes corresponds to a group of axial threaded holes, and each of the tensioning screws is threadedly connected to one of the radial threaded holes. The design of multiple groups of axial threaded holes facilitates the flexible adjustment of the position of the eyebolt according to the outer diameter of the driving ring, so that the center line of the spring remains parallel to the center line of the driving ring, and meets the clamping needs of shaft workpieces of different specifications.

[0013] Preferably, the flange is provided with a keyway, the bottom of the keyway is provided with a plurality of second threaded holes, one end of the transmission rod is embedded in the keyway, and one end of the transmission rod is fixed to the flange by screw connection and welding. The design of the keyway and the second threaded holes facilitates the positioning and installation of the transmission rod.

[0014] Preferably, the other end of the transmission rod is provided with a fork-shaped structure, and the transmission block is fixed to the fork-shaped structure by screws and hexagonal thin nuts. The design of the fork-shaped structure facilitates the assembly and disassembly of the transmission block and has a good positioning effect.

[0015] Preferably, a plurality of second through holes are formed on the flange, and the second through holes are used for installing screws. The flange is fixedly connected to the transition plate of the machine tool headstock by means of screw locking.

[0016] Compared with the prior art, the utility model has the following advantages: the tail end driving fixture for grinding shaft workpieces of the utility model is used in combination with the existing high-precision center and center frame, which can replace the chuck, fix the tail end of the shaft workpiece and drive the shaft workpiece to make a rotary motion, and has high positioning accuracy for the shaft workpiece, and the centering accuracy can reach within 0.001mm, which can achieve high-precision and high-efficiency clamping of shaft workpieces, and can be widely used in grinding machines with center heads. After the tail end driving fixture of the utility model is used in the grinding process of high-precision shaft workpieces, each shaft workpiece can save 5 to 15 minutes of alignment time, and the average grinding efficiency of shaft workpieces is improved by about 10%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an appearance diagram of the tail end driving fixture in the embodiment;

[0018] Figure 2 A top view of the tail end driving fixture in the embodiment;

[0019] Figure 3 It is a right side view of the tail end driving fixture in the embodiment;

[0020] Figure 4 This is a schematic diagram of the effect after the tail end drives the fixture to clamp the shaft workpiece in the embodiment;

[0021] The specific reference numerals in the figure are as follows:

[0022] 1-flange, 11-eye screw, 12-axial threaded hole, 13-keyway, 14-second through hole, 15-second threaded hole, 2-transmission rod, 21-fork-shaped structure, 3-transmission block, 31-hexagonal thin nut, 4-driving ring, 41-opening, 42-first through hole, 43-locking screw, 44-tensioning screw, 45-radial threaded hole, 5-spring, 6-axial workpiece, 71-transition plate, 72-top, 73-center frame. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] The tail end of the shaft workpiece grinding embodiment drives the fixture, such as Figure 1 to Figure 3 As shown, it includes a flange 1, a transmission rod 2, a transmission block 3, a driving ring 4 and four springs 5, the two ends of the transmission rod 2 are fixedly connected to the flange 1 and the transmission block 3, the driving ring 4 is fixedly connected to the transmission block 3, the driving ring 4 is coaxially arranged with the flange 1, an opening 41 is provided on the driving ring 4, and a first through hole 42 and a first threaded hole (not shown in the figure) are vertically arranged on both sides of the opening 41, a locking screw 43 passes through the first through hole 42 and is threadedly connected with the first threaded hole, the driving ring 4 is used to clamp the tail end of the shaft workpiece 6, and the four springs 5 ​​are evenly spaced along the circumference of the driving ring 4, and the two ends of each spring 5 are respectively connected to the flange 1 and the driving ring 4.

[0025] Specifically, in this embodiment, the two ends of each spring 5 are respectively hooked on a lifting eye screw 11 and a tensioning screw 44, the lifting eye screw 11 is threadedly connected to the flange 1, and the tensioning screw 44 is threadedly connected to the driving ring 4. The flange 1 is provided with multiple groups of axial threaded holes, each group of axial threaded holes includes multiple axial threaded holes 12 radially arranged outward from the central axis of the flange 1, each lifting eye screw 11 is threadedly connected to an axial threaded hole 12, and the outer wall of the driving ring 4 is provided with four radial threaded holes 45, each radial threaded hole 45 corresponds to a group of axial threaded holes, and each tensioning screw 44 is threadedly connected to a radial threaded hole 45.

[0026] Specifically, in this embodiment, a keyway 13 and three second through holes 14 are provided on the flange 1, the second through holes 14 are used to install screws, the flange 1 is fixedly connected to the transition plate 71 of the machine tool headstock by screw locking, a plurality of second threaded holes 15 are provided at the bottom of the keyway 13, one end of the transmission rod 2 is embedded in the keyway 13, one end of the transmission rod 2 is fixed to the flange 1 by screw connection and welding, the other end of the transmission rod 2 is provided with a fork-shaped structure 21, and the transmission block 3 is locked and fixed to the fork-shaped structure 21 by screws and hexagonal thin nuts 31.

[0027] After the above tail end drives the fixture to clamp, Figure 4 As shown, the flange 1 is fixed on the transition plate 71 of the machine headstock, the driving ring 4 is sleeved on the outside of the tail end of the shaft workpiece 6, and the locking screw 43 is in a locked state, so that the driving ring 4 holds the tail end of the shaft workpiece 6 tightly, and the shaft workpiece 6 is tightly fitted with the top 72 under the elastic force of the four springs 5, and the tail end of the shaft workpiece 6 is tightened by the top 72, and the front end of the shaft workpiece 6 is mounted and locked on the conventional center frame 73. Start the machine tool to complete the grinding of the shaft workpiece 6.

Claims

1. A tail end driven fixture for grinding shaft workpieces, characterized in that: It includes a flange, a transmission rod, a transmission block, a driving ring and a plurality of springs, the two ends of the transmission rod are respectively fixedly connected to the flange and the transmission block, the driving ring is fixedly connected to the transmission block, the driving ring and the flange are coaxially arranged, an opening is provided on the driving ring, a first through hole and a first threaded hole are respectively vertically arranged on both sides of the opening, a locking screw passes through the first through hole and is threadedly connected to the first threaded hole, the driving ring is used to clamp the tail end of the shaft workpiece, the plurality of springs are evenly spaced along the circumference of the driving ring, and the two ends of each spring are respectively connected to the flange and the driving ring.

2. The tail end driving fixture for grinding shaft workpieces according to claim 1, characterized in that: The two ends of each spring are respectively hooked on a lifting eye screw and a tensioning screw, the lifting eye screw is threadedly connected to the flange, and the tensioning screw is threadedly connected to the driving ring.

3. The tail end driving fixture for grinding shaft workpieces according to claim 2, characterized in that: The flange is provided with a plurality of groups of axial threaded holes, each group of axial threaded holes includes a plurality of axial threaded holes arranged radially outward from the central axis of the flange, each of the lifting eye screws is threadedly connected to one of the axial threaded holes, the outer wall of the driving ring is provided with a plurality of radial threaded holes, each of the radial threaded holes corresponds to a group of the axial threaded holes, and each of the tightening screws is threadedly connected to one of the radial threaded holes.

4. The tail end driving fixture for grinding shaft workpieces according to claim 1, characterized in that: The flange is provided with a keyway, the bottom of the keyway is provided with a plurality of second threaded holes, one end of the transmission rod is embedded in the keyway, and one end of the transmission rod is fixed to the flange by screw connection and welding.

5. The tail end driving fixture for grinding shaft workpieces according to claim 1, characterized in that: The other end of the transmission rod is provided with a fork-shaped structure, and the transmission block is locked and fixed to the fork-shaped structure by means of screws and hexagonal thin nuts.

6. The tail end driving fixture for grinding shaft workpieces according to claim 1, characterized in that: The flange is provided with a plurality of second through holes, and the second through holes are used for installing screws. The flange is fixedly connected to the transition plate of the machine tool headstock by means of screw locking.

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