Grinding cam rotary drive

Abstract

The utility model relates to a kind of clamps for shaft parts machining, specifically relates to a kind of grinding cam rotary drive device, including connecting disc, stop block, push pin and set screw;The connecting disc is opened with step hole, is fixedly installed on lathe headstock by internal hexagonal screw;Connecting disc end surface is opened with eccentric slot, and is provided with threaded hole in the direction perpendicular to eccentric slot;The stop block is fixedly installed in the eccentric slot of connecting disc and is pasted with eccentric slot side by internal hexagonal screw;The push pin one end is installed in workpiece pin hole, and the other end is inserted into eccentric slot;The set screw is assembled in the threaded hole of connecting disc, for eliminating the gap between push pin and eccentric slot.The utility model can realize the quick loading and unloading and accurate positioning when camshaft part is ground, improve clamping accuracy, and the utility model can avoid rechecking pin hole and cam angle when replacing workpiece, greatly improve grinding efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of clamps for shaft parts machining, specifically to a kind of grinding cam rotary drive device, belong to machining technical field. BACKGROUND

[0002] Camshaft is important part in engine system, and its cam profile, straightness, parallelism and surface roughness are all with higher requirements, usually high-precision numerical control cam grinder is used for processing. In existing processing, clamping positioning mode is mostly with spindle positioning support two centers, at this time, need to install heart chuck on one end of camshaft to drive camshaft rotation, and heart chuck is equipped with positioning pin to insert camshaft end face pin hole to realize angle positioning. However, using this heart chuck has obvious defects, after processing a product, chuck needs to be removed and installed on next workpiece, which is time-consuming to operate;When replacing new fixture, pin hole and cam angle need to be re-adjusted, which leads to low processing efficiency. SUMMARY

[0003] The utility model provides a kind of grinding cam rotary drive device to solve the problems existing in the prior art, the utility model can realize the quick loading and unloading and accurate positioning when camshaft part is ground, improve clamping precision, and the utility model can avoid re-adjusting pin hole and cam angle when replacing workpiece, greatly improve grinding efficiency.

[0004] To achieve the above object, the technical scheme provided by the utility model is as follows: a kind of grinding cam rotary drive device, including connecting disc, stop block, tumbler and tight screw;The connecting disc is fixedly installed on machine tool headstock by inner hexagonal screw and is provided with stepped hole;Connecting disc end surface is provided with eccentric groove, and is provided with threaded hole in the direction perpendicular to eccentric groove;The stop block is fixedly installed in the eccentric groove of connecting disc and is attached to one side of eccentric groove by inner hexagonal screw;The tumbler is inserted into eccentric groove at one end and installed in workpiece pin hole at the other end;The tight screw is assembled in the threaded hole of connecting disc, for eliminating the gap between tumbler and eccentric groove.

[0005] Moreover, two stepped holes are formed in the stop block, and the thickness of the stop block matches the depth of the eccentric groove.

[0006] Moreover, the tumbler is a stepped pin, one end of which is gap-fitted with the workpiece pin hole, and the other end is gap-fitted with the eccentric groove, and the coaxiality of the two ends of the tumbler is 0.005mm.

[0007] Moreover, the diameter D of the end of the tumbler inserted into the eccentric groove satisfies D=A-a, where A is the width of the eccentric groove, and a is the width of the stop block.

[0008] Moreover, the length of the end of the tumbler inserted into the workpiece pin hole is less than the depth of the workpiece pin hole.

[0009] Furthermore, when the center hole of the workpiece is close to the tip, the gap between the length of the pin inserted into the eccentric groove and the bottom of the eccentric groove is 0.5-1.5mm.

[0010] As can be seen from the above technical solution, the grinding cam rotary drive device provided by this utility model has the following advantages over the prior art:

[0011] (1) In the technical solution adopted by this utility model, the connecting plate is fixed on the machine tool headstock through the stepped hole, the stop block is fixed in the eccentric groove of the connecting plate, and the two ends of the pin form a clearance fit with the workpiece pin hole and the eccentric groove respectively. The overall structure is simple and the assembly relationship is clear. It is convenient to clamp, does not require alignment, and has high clamping accuracy.

[0012] (2) The technical solution adopted by this utility model eliminates the traditional chicken heart chuck and directly connects the workpiece and the eccentric groove of the connecting plate through the pin, eliminating the step of removing the chuck after processing and then installing it on the next workpiece, thus speeding up the clamping time and improving the grinding efficiency.

[0013] (3) Because in the technical solution adopted by this utility model, the matching dimensions of the pin and the workpiece pin hole and the eccentric groove are fixed, and the relative position of the connecting plate and the machine tool headstock is fixed, there is no need to readjust and calibrate the pin hole and cam angle when replacing the new fixture, the positioning repeatability is good, and the cam angle of each workpiece is consistent with the pin hole angle. Attached Figure Description

[0014] Figure 1 Assembly diagram of the grinding cam rotary drive device;

[0015] Figure 2 Front view of the connecting plate of the grinding cam rotary drive device;

[0016] Figure 3 Front view of the stop block of the grinding cam rotary drive device;

[0017] Figure 4 Front view of the pin of the grinding cam rotary drive device.

[0018] In the diagram: 1. Center; 2. Machine headstock; 3. Connecting plate; 4. Stop; 5. Pin; 6. Workpiece; 31. Eccentric groove; 32. Threaded hole; 33. Stepped hole; 41. Stepped hole. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited to the following embodiments.

[0020] The present invention provides a grinding cam rotary drive device, the structure of which is as follows:Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the assembly includes a connecting plate 3 for mounting on the machine tool headstock 2 and a stop block 4 mounted in an eccentric groove 31 on the connecting plate 3. One end of a pin 5 is inserted into the pin hole of the workpiece 6, and the other end is inserted into the eccentric groove 31 on the connecting plate 3. A set screw is fitted into the threaded hole 32 of the connecting plate to eliminate the gap between the pin 5 and the eccentric groove 31. The diameter d of the end of the pin 5 inserted into the pin hole of the workpiece 6 is determined according to the pin hole size of the workpiece 6, and the two are in clearance fit. The diameter D of the other end of the pin 5 is determined according to the width A of the eccentric groove 31 and the width a of the stop block 4, and D = Aa, and the fit tolerance is clearance fit. The length of the end of the pin 5 inserted into the pin hole of the workpiece 6 is less than the depth of the pin hole of the workpiece 6. When the center hole of the workpiece is close to the tip, the gap between the length of the end of the pin inserted into the eccentric groove and the bottom of the eccentric groove is 0.5-1.5mm, and the coaxiality of the diameters of the two ends of the pin 5 is 0.005mm.

[0021] In actual use, such as Figure 1 As shown, the connecting plate 3 is assembled onto the machine tool headstock 2 through the stepped hole 33 using hexagon socket screws. The stop block 4 is installed in the eccentric groove 31 of the connecting plate 3 through the stepped hole 41 using hexagon socket screws, with one side tightly against the side of the eccentric groove 31. One end of the pin 5 is inserted into the pin hole of the workpiece 6, aligning the center hole of the workpiece 6 with the tip 1, and the other end of the pin with the eccentric groove 31 on the connecting plate 3, so that the center hole of the workpiece 3 is tightly against the tip 1, and the pin 5 is inserted into the eccentric groove 31. The gap between the pin 5 and the eccentric groove 31 is eliminated by the set screw assembled in the threaded hole 32 of the connecting plate. The machine tool is started, and the eccentric groove 31 on the connecting plate 3 drives the pin 5, thereby driving the workpiece 6 to rotate for grinding cam machining, so that the angle of the cam of each machined workpiece 6 relative to the pin hole remains consistent.

Claims

1. A grinding cam rotation drive device, characterized in that: The device includes a connecting plate, a stop block, a pin, and a set screw. The connecting plate has a stepped hole and is fixedly mounted on the machine tool headstock by a hex socket head cap screw. The end face of the connecting plate has an eccentric groove, and a threaded hole is provided in a direction perpendicular to the eccentric groove. The stop block is fixedly mounted in the eccentric groove of the connecting plate by a hex socket head cap screw and is in contact with one side of the eccentric groove. One end of the pin is installed in the workpiece pin hole, and the other end is inserted into the eccentric groove. The set screw is assembled in the threaded hole of the connecting plate to eliminate the gap between the pin and the eccentric groove.

2. The grinding cam rotation drive device according to claim 1, characterized in that: The stop block has two stepped holes, and the thickness of the stop block matches the depth of the eccentric groove.

3. The grinding cam rotation drive device according to claim 1, characterized in that: The pin is a stepped pin, with one end having a clearance fit with the workpiece pin hole and the other end having a clearance fit with the eccentric groove, and the coaxiality of the two ends of the pin is 0.005mm.

4. The grinding cam rotation drive device according to claim 1, characterized in that: The diameter D of the pin inserted into one end of the eccentric groove satisfies D = Aa, where A is the width of the eccentric groove and a is the width of the stop block.

5. The grinding cam rotation drive device according to claim 1, characterized in that: The length of the pin inserted into the workpiece pin hole is less than the depth of the workpiece pin hole.

6. The grinding cam rotation drive device according to claim 1, characterized in that: When the center hole of the workpiece is close to the tip, the gap between the length of the pin inserted into the eccentric groove and the bottom of the eccentric groove is 0.5-1.5mm.

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