SU935188A1 - Method of producing ripping teeth and racks of cultivator - Google Patents

Description

(54 WAYS OF MANUFACTURING RB1 CLEANING PAWS AND CULTIVATOR STANDS

one

The invention relates to the processing of metals by pressure and welding and can be used in agricultural engineering in the manufacture of cultivators working bodies.

A known manufacturing method, in which the initial strip blanks, which are a multiple of several lengths, are divided at an acute angle into piece blanks, heated and deformed by rolling 1.

The known method is characterized by low productivity and instability of the length of the deformable product.

The aim of the invention is to increase productivity and improve product quality.

This goal is achieved in that according to the method of manufacturing loosening paws and cultivator stands, in which the original strip blanks, which are a multiple of several lengths, are divided at an acute angle into piece blanks, heated and deformed by rolling, a dual billet is selected as the initial blank , and the deformation produced from the sharp end

each separate billet in the direction of the rectangular end.

FIG. 1 shows a double blank; in fig. 2 - the beginning of the rolling process, the end of the rolling process and the part after rolling.

The method is illustrated by the example of manufacturing a loosening paw of type 8.6 (see GOST 1343-68).

The method is carried out as follows.

Measured dual billet 1 section B X t 14 X 45 mm and length L 940 mm of steel Art. 6 SP are divided at an angle of 20 ° in a stamp mounted on a press with an amplification of .60 tf model KS 132, into two symmetrical halves (Fig. 1). The length of each single billet Ljar 532 mm.

Then, zonal heating of the preform 1 to 1000 ° C is carried out with a length of 390 mm from the sharp end. The heating is performed in a special induction heater of the passage type. The heated billet is fed through guide wiring 2 (Fig. 3) between two milling dies 3 and 4, which are mounted on a roller by force

40 mc model KB-40 (not shown). The diameter of the smooth stamp DH is 290 mm, the diameter of the stamp in which the profiled stream is cut is DB 350 mm. When the rollers are turned on, the dies make a working revolution in which the sharp part of the workpiece 1 is captured, and the height of the product being profiled at this moment will be minimal. After the workpiece is gripped, its profiling is continued by dies, and the height of the formable section increases. The rolled semi-finished product is removed from the working zone of the rolls by the output wire 5.

Using the method has the following advantages over significant processes.

When rolling with decreasing crimping, the metal is squeezed out by wedge surfaces of the rolling brook towards the unformed end of the workpiece, and the engraving does not overflow, as a result, the burrs will be insignificant and, basically, only in the working blade zone metal consumption per product is reduced; for type 8.6 paws, metal consumption is reduced by 0.12 kg, which is 40% of the weight of the heat obtained using the known.

Such a rolling pattern is characterized by an almost complete absence of advanced metal flow, the length of the rolled part L ,, exactly repeats the geometry of the rolling stream, which, in turn, makes it possible to obtain a stable length L of the rolled semi-finished product and thus use the undeformed end of it as a base for subsequent trimming around and bending along the radius. For a paw of type 8.6, the variation in the length of the semifinished product Lj is practically determined within 4 mm, which is 4 times less than in the known.

Rolling with decreasing crimping occurs at lower specific loads, which has a positive effect on the durability of the rolling dies. In addition, the creation of a new base for trimming the blade eliminates the need to form the end of the working blade during rolling, and thus opens the stream in this place, which also significantly increases the durability of the die punch and results in frequent restoration of the stream engraving in the most loaded place.

The method can be carried out in the presence of a blank with a special end shape, which is dictated by the conditions of gripping the blank by rolling dies and its stability when profiling, so a double blank is used, which is divided into two symmetrical halves before heating.

The use of the method makes it possible to reduce by 25–40% the amount of metal going to the pond, increase the durability of the milling dies by 15–20% and create; Words to automate subsequent process overations - scraping and bending trimming, using the length of the rolled-up semi-finished product and its undeformable end as a reliable base.

All these positive qualities result in a reduction in the scrap on the product geometry and improve the parameters of the geometric accuracy of the products.

The method can be used in the manufacture of saber-type products.

Claims (1)

Invention Formula A method of making loosening paws and cultivator stands, in which the original strip blanks, multiple to several lengths, are divided at sharp angles into short billets, heated and deformed by rolling, characterized in that, in order to increase productivity and improve the quality of products, as the initial blank select a double billet with rectangular ends, and the deformation is performed from the sharp end of each divided billet in the direction of the rectangular end. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 3955, cl. B 2 H 7/10, 12.01.20 (prototype).