CN102699725A - Combined clamp special for keywaying of shaft - Google Patents

Abstract

The invention discloses a combined clamp special for keywaying of a shaft. The combined clamp special for keywaying of the shaft comprises a V-shaped block, a V-shaped block base plate, a pressure block, a rotary pressure cylinder, a rotary pressure cylinder base plate and a feather key. The V-shaped block is fixed on the V-shaped block base plate, the pressure block is connected onto the rotary pressure cylinder, the rotary pressure cylinder is fixed on the rotary pressure cylinder base plate, the V-shaped block base plate and the rotary pressure cylinder base plate are fixed on a work table of a machine tool through a bolt of a T-shaped groove or a nut of the T-shaped groove, and the feather key is embedded into the lower surface of the V-shaped block base plate and slides along the T-shaped groove of the work table, thus, the distance between two V-shaped block base plates can be conveniently adjusted so as to be adaptive to keywaying of different types of shafts. During processing, the shaft is supported on the V-shaped block and the rotary pressure cylinder is controlled by a numerical control system of the machine tool to press downward to fix the shaft. The set of device is simple in clamping manner, high in positioning precision and four shafts can be clamped at one time. During processing for batches, the set of device can save the labor time greatly and improve the production efficiency of plants.

Description

A combination fixture specially used for shaft keyway machining

technical field

The invention relates to a special tooling and fixture for shaft keyway processing matched with a numerical control machining center.

Background technique

Most of the keyways on the shaft are now processed by ordinary milling machines, and only one can be clamped at a time, and when there are many different types of keyways on the shaft, milling cutters of different sizes must be manually changed. When the number of machining is small This kind of clamping method has no obvious disadvantages, but when the processing volume is large, this kind of clamping method greatly affects the production efficiency.

Contents of the invention

The technical problem to be solved by the present invention is to make up for the existing problem of low efficiency of keyway machining on the shaft, and to provide a special combination fixture for shaft keyway machining that can improve production efficiency and help improve machining accuracy and is suitable for various sizes; Low cost, practical and reliable.

In order to achieve the above object, the scheme that the present invention takes is:

A combination fixture dedicated to shaft keyway processing, characterized in that it includes at least two sets of fixture units, the fixture unit includes a V-shaped bracket and a pressing device, and the V-shaped bracket includes: a V-shaped block backing plate. At least one pair of V-shaped blocks and guide keys are provided on the V-shaped block backing plate, and T-shaped nuts and bolts for fixing the V-shaped bracket are arranged on the V-shaped block backing plate; the pressing device includes: a rotary press Cylinder backing plate, at least 1 pair of rotary press cylinders is arranged on the backing plate of the rotary press cylinder, and nuts and T-bolts for fixing the pressing device are arranged on the backing plate of the rotary press cylinder, which are connected to the piston rod of the rotary press cylinder There are briquettes.

Compared with prior art, the present invention has following advantage:

The special tooling for shaft keyway processing of the present invention solves the repeatability of clamping during shaft keyway processing by using a simple structure. The position of the bracket and the clamping device on the machine table has high positioning accuracy. This set of devices can adapt to the clamping and positioning of most shafts of the same type, different types, and different specifications. This set of devices uses a rotary press cylinder as the clamping device. The device ingeniously realizes the function of clamping four axes at the same time, and the clamping is firm and the positioning is accurate. When processing in large quantities, this set of devices can greatly save labor time and improve the production efficiency of the factory.

Description of drawings

Fig. 1 is a top view of the structure of the present invention.

Fig. 2 is A-A sectional view of the structure of the present invention.

Fig. 3 is a B-B sectional view of the structure of the present invention.

Fig. 4 is a perspective view of the structure of the present invention.

In the figure, 1 V-shaped bracket, 2 Pressing device, 11 V-shaped block backing plate, 12 V-shaped block, 13 T-shaped nut, 14 Bolt, 15 Guide key, 21 Rotary press cylinder backing plate, 22 Rotary press cylinder, 23 Clamp, 24 T-bolts, 25 nuts.

Detailed ways

A combination fixture dedicated to shaft keyway processing, including at least 2 sets of fixture units, the fixture unit includes a V-shaped bracket 1 and a pressing device 2, and the V-shaped bracket 1 includes: a V-shaped block backing plate 11, in The V-shaped backing plate 11 is provided with at least one pair of V-shaped blocks 12 and guide keys 15, and the V-shaped backing plate 11 is provided with T-nuts 13 and bolts 14 for fixing the V-shaped bracket 1; The compression device 2 includes: a rotary press cylinder backing plate 21, at least one pair of rotary press cylinders 22 is arranged on the rotary press cylinder backing plate 21, and a nut 25 for fixing the compression device 2 is provided on the rotary press cylinder backing plate 21 and T-shaped bolts 24, a briquetting block 23 is connected to the piston rod of the rotary press cylinder 22. In this embodiment, the combined fixture includes 2 sets of clamping units, and 2 pairs of V-shaped blocks are arranged on the V-shaped block backing plate 11. 12. There are two pairs of rotary press cylinders 22 on the rotary press cylinder backing plate 21.

In order to make the content of the present invention more obvious and understandable, further description will be made below in conjunction with the accompanying drawings and specific embodiments.

In conjunction with Fig. 1, Fig. 2, Fig. 3, and Fig. 4, the special tooling fixture for keyway processing of shaft parts of the present invention includes a V-shaped block, a V-shaped block backing plate, a rotary press cylinder, a rotary press cylinder pressing block, a rotary press Cylinder backing plate and feather key. The V-shaped block is fixed on the backing plate of the V-shaped block, the rotary press cylinder is fixed on the backing plate of the rotary press cylinder, and the pressing block of the rotary press cylinder is connected to the rotary press cylinder. Both the backing plate of the V-shaped block and the backing plate of the rotary press cylinder pass through the T The slot bolts or T-slot nuts are fixed on the machine table, and the guide key is embedded in the lower surface of the V-block backing plate and can slide along the T-slot of the workbench, so that the gap between the two V-block backing plates can be adjusted conveniently. The distance is suitable for the processing of keyways of different types of shafts. During processing, the shaft is supported on the V-shaped block, and then the CNC system of the machine tool controls the rotary press cylinder to press down to fix the shaft.

Both the V-shaped block backing plate and the rotary press cylinder backing plate are fixed on the machine table by T-slot bolts or T-slot nuts, and the guide keys are embedded in the lower surface of the V-shaped block backing plate and can slide along the T-slot of the workbench. In this way, the distance between the two V-shaped backing plates can be adjusted conveniently so as to adapt to the processing of key grooves of different types of shafts. During processing, the shaft is supported on the V-shaped block, and then the CNC system of the machine tool controls the rotary press cylinder to press down to fix the shaft.

As a preferred embodiment of the present invention, both the V-shaped block and the rotary press cylinder are fixed through the backing plate and the T-shaped groove of the workbench, and the V-shaped block and the rotary press cylinder are both fixed on the backing plate to support the two shafts of the same shaft. Each V-shaped block must ensure that its centerline is on the same straight line. The initial assembly needs to be checked and adjusted by a special instrument, and fixed after adjustment.

As a preferred embodiment of the present invention, in order to adapt to different types of shafts, the distance between the two V-shaped block backing plates can be adjusted, and when supported at different diameters of the shaft, we place Put a small spacer on the top to ensure that the axis of the shaft is always level, which can ensure the machining accuracy of the keyway.

As an improvement of the present invention, a guide key is installed under the V-shaped block backing plate. When the bolt on the V-shaped block backing plate is loosened, the guide key can slide along the T-shaped groove, and the bolt can be directly tightened when sliding to an appropriate distance. At this time, the centers of the two V-shaped blocks supporting the same shaft are still on the same straight line, and do not need to be adjusted again, which can greatly save the time for reassembly.

As an improvement of the present invention, the press block of the press cylinder can be lengthened. Due to the limitation of the size of the processed shaft, when the distance between the two press cylinders is too close, interference will easily occur during the rotation. At this time, a shorter press block is used. When the distance between the two press cylinders is relatively long, we add a connecting block at the end of the pressing block to increase its length, and the two are connected by stop bolts.

When the special tooling for shaft keyway processing of the present invention is applied, the supporting position should be selected to ensure that there is enough space between the two V-shaped backing plates to install the rotary press cylinder backing plate. Choose a suitable spacer to pad under the backing plate of the rotary press cylinder so that the rotary press cylinder can be pressed to the shaft to be processed.

When determining the shaft to be processed, we select the support position and the pressing position of the rotary press cylinder according to the drawing of the shaft, and then adjust the distance between the two V-shaped block backing plates to be equal to the two supports on the shaft. The distance between the steps, tighten the bolts. Put the four shafts on the V-shaped block and align them sideways with the surface of the V-shaped block as the reference. At this time, the control panel of the CNC machine tool controls the rotary press cylinder to press down to fix the four shafts on the V-shaped block. The optimal value of the control pressure of the rotary press cylinder can be obtained through finite element analysis software, and can also be obtained through experiments. After the keyway processing is completed, the rotary press cylinder is controlled to lift up to take out the processed shaft and wait for the next processing. The specific implementation cases described in the present invention are only preferred implementation cases of the present invention, and are not intended to limit the implementation scope of the present invention. That is, all equivalent changes and modifications made according to the content of the patent scope of the present invention should be regarded as the technical scope of the present invention.

Claims (1)

1. a shaft key groove is processed special-purpose built-up jig; It is characterized in that; At least comprise 2 groups of fixture units, described fixture unit comprises V-shaped rest (1) and hold down gag (2), and described V-shaped rest (1) comprising: V-block backing plate (11); On V-block backing plate (11), be provided with at least 1 pair of V-block (12) and feather key (15), and on V-block backing plate (11), be provided with T type nut (13) and the bolt (14) that is used for fixing V-shaped rest (1); Described hold down gag (2) comprising: rotation cylinder pressure backing plate (21); On rotation cylinder pressure backing plate (21), be provided with at least 1 pair of rotation cylinder pressure (22); And in rotation cylinder pressure backing plate (21), be provided with and be used for fixing hold down gag (2) nut (25) and T type bolt (24), on the piston rod that rotates cylinder pressure (22), be connected with briquetting (23).

Images