Cracking connecting-rod initial stress trough two-way processing device

Abstract

The present invention discloses a dual-way machining device of the cracking connecting rod initial stress slot. One of the proposals of the present invention is that a left and a right supporting rods which are respectively provided with at least one idler pulley and pass in from one end of inner hole of the work piece and extend out from the other end; a machining thread passes from the idler pulley arranged on the left slide block to the idler pulleys arranged on the left and right supporting rods where the thread turns 180 degree and reachs the idle pulley arranged on the right slide block, conducted by the pulleys the machining thread forms two sections of working parts, i.e. a left section and a right section axially paralleling with the surface shaft of the inner hole, namely, the machining thread section between the idler pulleys and the machining thread section between the idler pulleys; the slide block are separate from each other, while the two working sections of the machining thread are also separated and close to the surface of the inner hole of the work piece; the worktable is provided with a positioning pin, and the work piece is fixed on the positioning pin by the inner hole of the work piece. Adopting a dual-way cutting device, the present invention can synchronously cut the two cracking stress slots at the symmetric positions of the surface of the inner hole, shortening the machining time; moreover, the present invention has low cost and low maintenance fare.

Description

technical field [0001] The invention relates to a two-way processing device for an initial stress groove used for cracking a big end hole of a connecting rod. Background technique [0002] In the cracking process of the connecting rod, two stress grooves need to be machined along the axial direction at the symmetrical position on the surface of the inner hole. Currently, the commonly used methods include broaching, laser, water jet, wire EDM, etc. The broaching method of processing fine grooves requires a sharp tool tip, and because of this, the tool is extremely easy to wear, so the processing quality is unstable, and has been eliminated; the laser method has high efficiency and stable quality, but the high cost and maintenance costs hinder Its popularization and application have been promoted; the water jet grooving method has been reported, but it has not been implemented, and there are still doubts about its feasibility; WEDM is very suitable for processing fine grooves,...

AI Technical Summary

Problems solved by technology

The broaching method of processing fine grooves requires a sharp tool tip, and because of this, the tool is extremely easy to wear, so the processing quality is unstable, and has been eliminated; the laser method has high efficiency and stable quality, but the high cost and maintenance costs hinder Its popularization and application have been promoted; the water jet grooving method has been reported, but it has not been implemented, and there are still doubts about its feasibility; WEDM is very suitable for processing fine grooves, but the traditional WEDM machine tool can process a groove for each inner hole. Parts need to be loosened and clamped once, which is extremely cumbersome and inefficient

The patent (Application No. 200410069638.7 is used to form the processing device of the fracture slot of the connecting rod) proposes a mechanical cutting device, which can extend into the inner hole to process the fine groove, but the device is bulky and can only process larger-sized holes. Moreover, the two symmetrical grooves need to be processed in two sequences, which is low in efficiency. In addition, the traditional mechanical processing technology is used, the tool loss is large, and the processing quality is difficult to guarantee.

The patent (200410010821.X Engine Connecting Rod Initial Cracking Groove Processing Device) adopts the broaching method, which leads to large tool loss and difficult to guarantee dimensional accuracy

The patent (200410010722.1 laser processing method and equipment for prefabricated cracking groove before connecting rod fracture and splitting) uses laser grooving, but the cost is high, and the metal at the groove is easy to produce hard spots after being melted by laser irradiation and then cooled and solidified, resulting in Subsequent finishing tool chipping

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