SU1411084A1 - Method of producing articles provided with blades like those of working member of farm machines - Google Patents

Abstract

The invention relates to the processing of metals by pressure and m. used for the manufacture of products with blades, for example, the working bodies of agricultural machines. The goal is to increase labor productivity, improve the durability of die tooling, ensure metal savings and improve product quality. The operations of cutting the original billet, heating, shaping the punching blades and forming a wear-resistant layer are carried out. During the shaping of the blades, the chamfer is molded at an angle of sharpening in the working space formed by the tool pair. One of the surfaces of the pair has a bevel corresponding to the angle of sharpening the blade. Before shaping the blade, the edge of the blank is positioned at a distance from the intersection line of the bevel with the working surface forming the blade equal to 0.3-0.5 of the bevel height. The sharpening of the blade is carried out on the machines, the removal of the metal is carried out on the chamfer to the carbide layer. 3 pe. t and with

Description

OS

The invention relates to the processing of metals by pressure and can be used for the manufacture of products with blades, mainly of the type of working bodies of agricultural machines.

The purpose of the invention is to increase labor productivity, improve the quality of the product, as well as save metal and improve the quality of products.

Figure 1 shows the blade, intended for surfacing; (a) c without overlaying (b and iv); 2 shows the initial position of the workpiece relative to the engraving of the instrument; FIG. 3 shows the final stage of forming a cutting edge,

The workpiece 1 (Fig. 2) of the paw with thickness S is obtained by cutting from the sheet, punching holes, heating up to the initial temperature the part of the workpiece i that is subjected to deformation. Before shaping, the workpiece 1 is exposed with respect to the tool pair 2, 3 (being a punch and die during punching, and with rollers during rolling), forming a wedge with an angle of of wedge in the working area. : Moreover, in the working space formed by instrumental pair 2, 13, one of the surfaces (for example, for matrix 3) has a bevel 4 of width b, corresponding to the angle of sharpening of the blade f, and the other (for example, for punch 2) can have (in if deformed blades with a small angle are deformed with / smooth transition at an angle, the steps from the blade to the main body of the product will be zukmtsy.

Expose the workpiece 1 so that its edge 5 is located on the bevel 4 from the intersection line of the bevel 4 with the working surface of the die forming the blade, at a distance equal to (0.3-0.5) b. After that, the workpiece is deformed with force P (either in the dies or pass through the shaft), resulting in a blade 6 with a chamfer and the necessary sharpening of the blade h. After shaping the blade 6, a wear-resistant layer is formed. This may be surfacing with a hard alloy, and high-frequency hardening, and other methods. To ensure greater sharpness of the blade 6 from the stool 4, at an angle of sharpening a grinding wheel produces a small metal removal (for guided blades, up to the carbide layer).

I

The results of laboratory studies to measure the specific forces during the shaping of stepped blades (Fig. 1a) with a wedge angle of 6 ° show that, due to the presence of bevel 4 on the stamp (on the matrix 3) and when placing the edge 5 of the workpiece (Fig. 2) with respect to bevel 4, as said, the specific forces are reduced to 2-2.5 times. This allows you to increase the durability of die tooling more than n 2 times by increasing the width of the blade 1 s to I mm and decreasing

.l l

blade edges h 6 to 1.1., mm.

U; J

Q

0

-

Example. Make a lancet paw C-5.23. From the strip, 496 mm wide, cut down the workpiece with a thickness of 6 mm in the form of an arrow with a shank. Angle mortar arrows. Two square holes are punched in the shank 11 X. Further along the wings, the zone widths of 12-15 mm to 1370-1420 ° K are heated. The shaping of the blades is carried out in a stamp on a coining press with a force of 10 MP. On the bottom matrix there is a bevel 8 mm wide at an angle / i 15 °. On the punch, the bevel is made at the angle of the blade with / 6. (The working space is similar to that shown in figure 2). Before deforming, the edge of the blank is placed on the bevel at a distance of 2-4 mm from the intersection line of the bevel with the working surface of the die, which is made horizontally. At the same time, the specific deformation forces (average) are 450-600 MPa, the blade sharpness is 0.6-1.2 mm, and the blade width is 1-20 mm. Surfacing of the blade is carried out according to known modes.

The sharpening of the blade is carried out on special machines, the removal of the metal carried out on the chamfer to the carbide layer. The feed of the grinding wheel is 8 m / min, which is 1.3 times higher than that when grinding the blade without a bevel. The resulting blade has no burns of the base metal. The durability of die tooling increased by 2 - 2.5 times.

Increasing the durability of die tooling allows you to save expensive tool steel, reduce the amount of tools you need, reduce downtime for tool changeover, increase production, and consequently, not only the performance of this operation, but also the entire process. The presence of the chamfer on the blade 6 can significantly reduce the removal of metal during grinding, and in some cases completely eliminate this operation. Since the removal of metal is insignificant, the productivity of this operation is also reduced due to the intensification of the modes (speeds) of the processing, the consumption of abrasive wheels is significantly reduced. The die tooling is simplified significantly, since, compared with the known structures, the method does not require a wedge system for setting the initial position of the workpiece.

Claims (1)

The invention The method of manufacturing products with blades of the type of working bodies of agricultural machines, including the cutting of the original billet, heating, shaping the blades, punching holes, forming a wear-resistant layer, characterized in that, in order to increase productivity, improve the resistance of the gampa tooling , as well as saving metal and improving the quality of products, when shaping the blade, the chamfer is molded under the grinding angle in the working space formed by the tool Flax pair, one of whose surfaces has a bevel corresponding to the angle of sharpening the blade, wherein the blade edge before the shaping blank on a slant at a distance from the line of intersection of the bevel with the working surface of the molding blade bevel width equal to 0.3-0.5. but Well vn / bond Fi2.7 , 4 o..st FIG. J 0U9.2