Machining method for machining rod head assembly for telescopic oil cylinder based on double vertical clamping

Abstract

The invention relates to the technical field of rod head machining, in particular to a machining method for machining a rod head assembly for a telescopic oil cylinder based on double vertical clamping. The method comprises the following steps: blanking: cutting a long steel square rod into square rod workpieces required by processing; milling: milling five surfaces of the square rod workpiece to obtain a rod head workpiece; multi-surface vertical clamping: clamping the rod head workpiece by using multi-surface vertical clamping equipment by taking the center of the rod head workpiece as a reference; and single-side vertical clamping: clamping the rod head workpiece by using single-side vertical clamping equipment by taking the center of the rod head workpiece as a reference. The single-side vertical clamping equipment and the multi-surface vertical clamping equipment both take the circle center of a boss or a concave table of a workpiece as a datum point, so that the influence of the milling face dimensional tolerance on the machining precision is avoided; a single-side positioning plate and a multi-surface positioning plate are matched, so that machining is conducted through the same datum plane, and the problem of machining precision caused by different reference surfaces and repeated clamping is solved.

Description

technical field [0001] The invention relates to the technical field of rod head processing, in particular to a processing method for processing a rod head assembly for a telescopic oil cylinder based on a double vertical mounting clamp. Background technique [0002] The rod head assembly is one of the core components of the telescopic hydraulic cylinder of construction machinery. It is mainly used on cranes to provide power for the telescopic boom of the crane through oil pressure; the rod head assembly is a high-precision part with a complex structure. It directly affects whether the oil pressure of the telescopic cylinder of the crane is stable and whether the oil circuit is smooth. If the accuracy does not meet the requirements, it will lead to serious consequences such as oil leakage, balance valve failure, and arm bending. [0003] In the prior art, the rod head assembly is processed by multiple clamping and positioning, the processing process is long, the processing ac...

AI Technical Summary

Problems solved by technology

[0002] The rod head assembly is one of the core components of the telescopic hydraulic cylinder of construction machinery. It is mainly used on cranes to provide power for the telescopic boom of the crane through oil pressure; the rod head assembly is a high-precision part with a complex structure. It directly affects whether the oil pressure of the telescopic cylinder of the crane is stable and whether the oil circuit is smooth. If the accuracy does not meet the requirements, it will lead to serious consequences such as oil leakage, balance valve failure, and arm bending.

[0003] In the prior art, the rod head assembly is processed by multiple clamping and positioning, the processing process is long, the processing accuracy is low, and the rejection rate is high. Among them, the rod head assembly is a complex and irregular high-precision part that involves milling, turning , Drilling, welding, grinding and other processes, the process route is long and the processing is difficult, and the processing difficulties are mainly: there are many processing surfaces. In the prior art, only one surface can be processed each time the route is clamped. Repeated clamping and original clamping methods The accuracy of the distance between each hole position relative to the valve core hole cannot be achieved; the size of the valve core hole is the most important quality index of the rod head assembly. In the prior art, the fine boring and chamfering of the valve core hole are clamped with flat pliers, and the flat pliers lock each time after clamping. There will be angular deviation in the position of the workpiece after death, and the maximum deviation of 1mm will be caused during fine boring and chamfering, which will easily cause the deviation of the valve core hole and chamfering position, resulting in the problem of assembly and cutting seals, and the product quality in mass production cannot be guaranteed.

[0004] Moreover, the rocker drill in the prior art uses the auxiliary tooling hole template to fix on the surface of the workpiece, and then visually aligns with the center point of the hole before drilling. The control factors lead to the out-of-tolerance hole size; according to statistics, the hole center size deviation can reach up to 0.58mm

There is a risk of substandard quality

In addition, the radial arm drill of the original rod head assembly process needs to be processed on all 6 surfaces, with many times of clamping and long processing time, requiring 4 sets of equipment for processing

Images