RU150113U1 - DEVICE FOR MANUFACTURE OF CUTTING TOOLS - Google Patents

Abstract

A device for the manufacture of cutting tools containing rolls with deforming surfaces, characterized in that the deforming surfaces of the rolls are combined with a smooth arcuate surface and a zigzag relief, divided by steps asymmetric beveled in the direction of rotation of the rolls, while the deforming surfaces of the rolls with a zigzag relief are offset the center of the arcs of their circles relative to the center of rotation of the rolls.

Description

The proposed utility model relates to the processing of metals by pressure, in particular to devices for making knurled edges of cutting tools and can be used in the manufacture of beetroot knives in centrifugal plants for grinding raw materials in the production of sugar.

A device is known for the manufacture of blanks for beetroot knives in a stamp followed by milling (Azrilevich M.Ya. Sugar factories equipment. - M.: Light and food industry. - 1982, p. 100 and 101, Fig. 41).

However, the known device does not reduce the complexity of the processing process by cutting the blanks of knives due to the presence of forgings significant allowances for milling.

The closest technical solution to the proposed device is the selected device for the prototype device, described in the method of manufacturing the blades of cutting tools, and containing rolls with deforming surfaces located with an offset of the coordinates of the center of the circumference of the arc relative to the axis of rotation (Patent No. 2087238, IPC B21H 7/10, publ. . 08.20.1997).

However, the applicability of this device is limited to the manufacture of blades of blade knives having a straight and smooth profile of the cutting part.

The technical task of the utility model is to expand the technological capabilities of the device and improve the quality of knurling of zigzag cutting surfaces.

The problem is solved in that in the device for the manufacture of cutting tools containing rolls with offset coordinates of the center of the circle of the arc of the deforming surfaces, according to the utility model, the deforming surfaces of the rolls are made combined with a smooth arcuate surface and a zigzag relief, separated by asymmetric beveled steps in the direction of rotation of the rolls, in this case, only parts of the deforming surfaces of the rolls with igzagoobraznym relief, and the difference between the numerical values of the radii of the arcs of circles forming the zigzag protrusions and corresponding depressions of the relief equal step height.

In FIG. 1 shows a device for manufacturing cutting tools, for example, a beetroot knife, in the initial and final stages of knurling.

In FIG. 2 is a view A of FIG. 1 utility model.

The inventive device consists of rolls 1, 2 (Fig. 1), connected with a hydraulic drive with the possibility of reversible rotation by an angle α, deforming surfaces 3, 4, providing the shaping of the forgings of the beet cutter 15 with allowances for grinding during hot rolling of the workpiece 14 between the rolls 1 , 2. The deforming surfaces 3, 4 are made combined, consisting of smooth arcuate surfaces 5, 6, forming when rolling the holder 16 of the beet cutter 15, and parts 7, 8, which form a zigzag shape when closed at a length l loif 11 (Fig. 2). Smooth and zigzag sections are separated by asymmetric, with respect to each other, beveled in the direction of rotation of the rolls 1, 2 steps 9, 10 of height H, allowing to form a curved longitudinal profile of the forging of beet cutter 15 (Fig. 1). Moreover, with a shift of e coordinates of the center O _{1 of} the arc circumference with radii R and R ₁ , only parts 7, 8 of the deforming surfaces 3, 4 are made, which ensures the formation of the angle β at the zigzag profile 11 (Fig. 2) and the corresponding uniform increment of the thickness t by the value of h along the length l from the top to the base of the beetroot knife 15 (Fig. 1). The difference in the numerical values of the radii R and R _{1 of the} circles of the arcs forming the zigzag protrusions 12 and the corresponding troughs 13 (Fig. 2) of the zigzag relief 11 is equal to the height H of the steps 9, 10, i.e. R ₁ -R = H. The shift e of the coordinates of the center O ₁ is determined by the formula: e = R · h / l. The arrows in FIG. 1 shows the direction of rotation of the rolls 1, 2.

The device operates as follows.

The preform 14 (Fig. 1), preheated to a plastic deformation temperature of 1050 ... 1100 ° C, in the form of a steel plate is installed perpendicular to the rolling direction between the deforming surfaces 3, 4. When the rolls 1, 2 counter-rotate, the formation of the holder 16 begins with smooth arcuate surfaces 5, 6 Then, steps 9, 10 having bevels corresponding to the longitudinal profile of the knife 15 and height H, the beet-cutting knife 15 is bent. After that, a zigzag relief 11 is formed (Fig. 2) with parts 7, 8 deforming the surface 3, 4 (Fig. 1), which, when closed during the rolling process, form zigzag protrusions 12 and their corresponding depressions 13 (Fig. 2).

The process of forming a beetroot knife 15 is carried out in one pass when the rolls 1, 2 are turned through an angle α and are finished at a temperature of 950 ... 1000 ° C. The deforming elements of the device in direct contact with the heated part are made of heat-resistant stamped steel grade 5XHM.

The presence of a displacement e between the center of rotation O of the rolls 1, 2 and the center O _{1 of the} circle of arcs with radii R and R ₁ at parts 7, 8 of the deforming surfaces 3, 4 allows you to form a zigzag relief of the cutting edge of the knife 15 at an angle of inclination β with a uniform increment of thickness t (Fig. 2) by the value of k (Fig. 1) along the length l from the top to the base of the working part of the beet cutter 15 (Fig. 1), which provides a gradual increase in effort and degree of deformation during compression of the cutting part of the knife, gives it additional fatigue strength designs.

The beet cutter blank obtained after transverse rolling is subjected to grinding, heat treatment and sharpening of cutting edges.

The device allows to obtain from plate blanks of a given thickness, obtained by cutting from a steel sheet, blanks for beet cutters with minimal allowances for subsequent machining, excluding laborious grinding, with a complex longitudinal curved profile formed by a zigzag cutting surface, which has an additional margin of safety due to surface hardening and creating additional thickening of the cutting feathers at the base of the working part of the knife, while fully consistent x the requirements of the factory drawing of knives of the Königsfeld design of serial centrifugal beet cutters.

The design of the device expands the technological capabilities of rolling due to the ability to produce parts with complex geometric shapes and various configurations with minimal metal loss during subsequent processing by cutting without disturbing the natural arrangement of fibers in sheet metal.

Thus, the application of the proposed device will achieve the following results.

1. The presence of a stepped longitudinal profile and a zigzag transverse relief of the deforming tool expands the technological capabilities of the rolling device, allowing the production of parts with a complex profile of work surfaces by hot volume rolling.

2. The device provides the manufacture of zigzag cutting surfaces of beetroot knives with the maximum possible approximation of the workpiece configuration to the geometric parameters of the finished product.

3. The device provides a stable level of quality of the obtained product in accordance with the requirements of technical documentation, allows you to completely avoid laborious milling operations, contributes to the hardening of the material in the area of the working cutting part of the knife compared to the non-working surface of the holder, which ultimately leads to an increase in its durability.

The utility model will improve the quality of complex profile knurled surfaces by obtaining uniform and guaranteed allowances for beet-cutting knives made by knurling of the Konigsfeld design.

Claims (1)

A device for the manufacture of cutting tools containing rolls with deforming surfaces, characterized in that the deforming surfaces of the rolls are combined with a smooth arcuate surface and a zigzag relief, divided by steps asymmetric beveled in the direction of rotation of the rolls, while the deforming surfaces of the rolls with a zigzag relief are offset the center of the arcs of their circles relative to the center of rotation of the rolls.

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