RU2397849C1 - Method for manufacturing of tillage point (versions) - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: method may be used to manufacture lancet points of tillage tools. When manufacturing welded point, wings are welded to form V-shaped edge at the side opposite to welded seam, with length of 30-70 mm with opening angle of 30-55°, and it is filled with filler charge. In stamped point U-shaped groove is formed along axis of symmetry on outer side of nose portion, with length of 15-30 mm, and filler charge is placed in it. Induction welding is carried out with simultaneous heating of point wings for tempering provided that hardness of welded metal by 2-8 units according to HRC compared to the main metal.

EFFECT: method provides for increased wear resistance of lancet point nose part and reduction of its tractive resistance in soil.

2 cl, 7 dwg, 4 tbl, 2 ex

Description

The invention relates to agricultural machinery, in particular to cutting working bodies for tillage.

A known method of manufacturing a cutting working body, where to reduce wear the nose is specially thickened (A.S. 1403122).

The closest in technical essence to the first option is a method of manufacturing a tillage leg, described in RU 2309830 C2, 11/10/2007, including welding its wings and shank, hardening and hardening of the bow by welding.

The closest in technical essence to the second option is a method of manufacturing a tillage leg RU 2309987 C2, 02/10/2007, including its stamping, hardening and hardening of the bow by welding.

The main disadvantage of the paws made by the above methods is that their nose part in relation to the wings wears out 2-3 times faster, therefore, culling occurs due to the sock despite the fact that the remaining part (wings) is still functional. Therefore, in some cases (for a stamped paw), the bow is thickened, and when the welded paw is reinforced, the weld is reinforced, resulting in an increase in traction up to 10%.

The objective of the present invention is to increase the wear resistance of the nose of the lancet paw and reduce its traction resistance in the soil.

The present problem is solved in that according to the first embodiment, in a method for manufacturing a tillage leg, including welding its wings and a shank, hardening and hardening the bow by welding, the wings are welded with the formation of a V- shaped edge from the side opposite to the weld, 30-70 mm long with an opening angle of 30-55 °, fill it with a surfacing charge and carry out its induction surfacing with simultaneous heating of the wings of the legs for hardening from the condition of increasing the hardness of the deposited metal by 2-8 units according to HRC _e compared w with the base metal.

According to the second option, in the method of manufacturing a tillage leg, including stamping, quenching and hardening of the nose by surfacing, before surfacing, along the axis of symmetry of the legs, on the outside of the nose, a U-shaped groove is made, 15-30 mm long, filled with a surfacing charge and its induction is carried out while heating surfacing paw wings quenching conditions of increasing the hardness of weld metal on a 2-8 points on _e HRC as compared with the parent metal.

The technical result of the invention is to reduce traction and increase the wear resistance of the nose of lancet (hollow) paws by induction surfacing of hard alloy in a V- or U-shaped groove of the edges in the nose of the paw while heating the remaining parts of the paw under hardening.

The essence of the invention lies in the fact that in the V- and U-shaped edge or groove with a length of 15-70 mm, made by welding or stamping a pointed (full) paw, the hard alloy is deposited in hardness greater than the hardened metal by 2-8 units according to НРС _э that provides the effect of self-sharpening of the working body. During operation, the toe of the paw has a pointed shape (in the form of a “spear”). This reduces traction compared to existing working bodies. The deposited hard alloy in the toe of the paw increases the wear resistance of the sock.

Figure 1 is a diagram of a tillage leg with cutting edges of the bow.

In Fig.2 a section of the nasal edge of the tillage leg along AA.

Figure 3 presents a diagram of a deposited layer of a hard alloy of a welded paw.

In Fig.4 a section of the nose edge of the welded paw along BB.

Figure 5 shows a diagram of a deposited layer of a hard alloy of a stamped paw.

Figure 6 is a section through the nose edge of a stamped paw along BB.

7, the macrostructure of the deposited hard metal layer.

The arrow-shaped paw (Fig. 1) contains a shank 1 connected by welds 2 and 3 with wings 4 and 5. The wings are interconnected by a weld 8 from the bottom, and a surfacing charge 6 is poured into the groove 7, resulting from welding between themselves under angle of 30-35 ° in accordance with the geometric shape of the paw.

After that, it is placed in an inductor, where the hard alloy is surfaced in the bow of the product and heated to harden the wings of the lancet paw. Then the paw is placed in a quenching liquid for the implementation of the hardening process with subsequent low tempering of 250-300 ° C for 2 hours.

An example of a specific implementation 1. Prepared 6 welded legs of steel 50X1'A. At the junction of the wings from above, a V-shaped edge with an opening angle was varied from 30 ° to 55 °, and its length was from 30 to 70 mm (depending on the length of the lower seam of the nose of the paw). A special metering device was used to fill the surfacing mixture, consisting of 85% PS-14-60 hard alloy and 15% flux. Then the paw was placed in a two-turn inductor, one of the turns melted the charge, and the other heated the wings of the paw for quenching.

Surfacing and hardening was carried out using a high-frequency generator VChG3-160 / 0.66, where the heating and melting processes were carried out simultaneously.

After the charge was melted and the wings of the paw of quenching temperatures were reached, the generator was turned off, and the hardened product was transferred to a bath with quenching liquid (oil).

The results of determining the hardness after hardening are shown in table I, and after tempering in table 2.

Table I Paw hardness after hardening (oil) Experience Number Hardness, HRC, Deposited layer Base metal Weld* one 55 fifty thirty 2 57 49 28 3 54 51 26 four 56 52 28 5 55 47 28 6 54 48 27 * Welding wire Sv-08G2S

Table 2. The hardness of the paws after tempering 250 ± 10 ° C (3 hours) Experience Number Hardness, HRC, Deposited layer Base metal Weld one 52 48 thirty 2 52 47 28 3 52 fifty 27 four 51 49 26 5 52 45 thirty 6 51 40 28

Laboratory and field tests of the SZS-2.1 lancet paw with hardening of the nose by hard alloy showed that their wear resistance increased by 2-3 times, the mechanics of soil cultivation improved, traction was reduced due to the absence of a weld along the nose of the leg, and the effect of self-sharpening of the most loaded parts of the working body.

The length of the deposited layer 30-70 mm is determined by the length of the bow of the lancet paw and the width of the hardened part of the blade. The opening angle is determined by the type of paws and the thickness of the metal wings and is 30-55 °. With a difference in hardness of the deposited layer and the base metal of the cutting edge of less than 2 HRC units, the effect of the self-sharpening of the toe of the paw is not observed, it acquires an oval shape and thereby increases traction. If the difference in hardness is more than 8 HRC, uneven wear of the toe of the paw occurs and conditions are created under which it breaks off, thereby increasing the pulling resistance for a while.

Example 2. Prepared 6 welded legs of steel 50X1'A. In the place where the wings converged from above, a U-shaped groove was made for a length of 15 to 30 mm (depending on the size of the legs). A special metering device was used to fill the surfacing mixture, consisting of 85% PS-14-60 hard alloy and 15% flux. Then the paw was placed in a two-turn inductor, one of the turns melted the charge, and the other heated the wings of the paw for quenching. The results of hardness measurements after hardening are presented in table 3.

Table 3 Paw hardness after hardening (oil) Experience Number Hardness HRC Deposited layer Base metal one 56 52 2 55 49 3 56 51 four 55 53 5 55 48 6 52 49

Table 4 The hardness of the paws after tempering 250 ± 10 ° C (3 hours) Experience Number Hardness HRC Deposited layer Base metal one 54 48 2 55 47 3 52 49 four 52 49 5 53 47 6 51 48

The wear resistance of the paw after hardening its nose has more than doubled.

Claims (2)

1. A method of manufacturing a tillage leg, including welding its wings and shank, quenching and hardening of the nose by welding, characterized in that the welding of the wings is carried out with the formation from the side opposite to the weld, a V-shaped edge with a length of 30-70 mm with an opening angle of 30 -55 °, fill it with a surfacing charge and carry out its induction surfacing with simultaneous heating of the wings of the legs for quenching from the condition of increasing the hardness of the deposited metal by 2-8 units according to HRC _e compared to the base metal. 2. A method of manufacturing a tillage paw, including stamping, hardening and hardening of the nose by surfacing, characterized in that before surfacing along the axis of symmetry of the legs on the outer side of the nose, a U-shaped groove of 15-30 mm is filled, filled with a surfacing charge and carried out its induction surfacing with simultaneous heating of the wings of the legs for hardening from the condition of increasing the hardness of the deposited metal by 2-8 units according to HRC _e compared to the base metal.

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