SU1816671A1 - Knurling roller - Google Patents

Description

The invention relates to mechanical engineering and instrument making and can be used for straightening the RPM shafts, their usual rolling and combined processing - rolling with simultaneous straightening.

L The purpose of the invention is to improve the quality of processing and expand the technological capabilities of the roller.

Figure 1 shows the geometric shape of the rolling roller: Figures 2-4 show sketches of rolling a curved shaft.

Workpiece 1 is installed in the centers of the lathe. It is in contact with the probe of the sensor 2, connected to the stepper motor control unit (STM) 3. The latter is connected to the stepper motor (SM) 4, which controls the position of the knurling head (not shown), in which the knurling roller 5 is installed.

Parts 1 report rotation. Sensor 2 generates a signal and sends it to the BUSHD

3, which, depending on the value and sign of the signal from the sensor 2, generates a command and transmits it to the SM 4. The latter; turns the knurled head together with the roller 5 into positions I, II or III (Figs. 2-4). When the part 1 turns towards the roller 5 with its concave surface. SD 4 turns the roller 5 to position I (figure 2). When the part turns to the roller with its convex side - to position II or III (Fig. 3 and 4). The knurled head is brought up until the roller 5 touches the part 1, loaded with force P and the head is fed along the generatrix of the shaft 1. Simultaneously with the rolling of the surface of the shaft, the process of its straightening is carried out strictly in the bending plane.

1816671 A1

If shaft 1 is completely straightened during machining, sensor 2 generates a signal for no beating and stepper motor 4, with continuous rotation of the shaft 1 / ·, fixes one of the three positions of the roller J (Ι-III), depending on the required work-hardening depth. Therefore, then the usual uniform roll of the shaft is carried out over its entire surface. In this case, the previously achieved straightness of its axis is not violated,

Thus, the process of machining the part goes on continuously without resetting the part or tool, which increases the productivity of machining and facilitates the use of the proposed roller in automatic production.

Example. It is necessary to process a shaft made of 45 steel with "t = 36 kg / mm ^{2 with a} diameter D = 60 mm." We carry out processing on a lathe. Rolling force P = 100 kg,

We accept the roller diameter d = 50 mm, the width of the imaginary ellipsoid -14 mm. Let's calculate the minimum r and maximum Hmax radii of the ellipsoid. They are equal: r = 2 mm, Rmskc = 89 mm. Let's calculate the depth of the work-hardened layer on the concave and convex surfaces of the shaft, taking Ri = 70 mm. They are respectively equal to di = 1.05 mm, dg = 0.65 mm. The ratio K = di / dg = 1.6. When using the prototype roller, the ratio is K = 1.14. It can be seen that the difference in the depths of the work-hardened layer on the concave and convex surfaces of the shaft of the proposed roller is much greater than that of the prototype. Consequently, the editing effect is much higher.

The effect of straightening increases even more when the generatrix of the cone is used as the OE (position III in Fig. 4), since in this case the radius R | = <u. The depth of the work-hardened layer on the convex surface of the shaft is close to zero, and the ratio K = di / dg will sharply increase.

The proposed roller can be used for normal rolling of the shaft at a constant position of the roller I, II or III (Figs. 2-4). In this case, an angle a corresponding to the selected radius Ri, or an angle β equal to the angle of inclination of the generatrix of the cone to its axis, is set. Since the radius of curvature of the ellipsoid30 da Ri smoothly varies from r to R _M axc, the work-hardening depth can be smoothly adjusted over a wide range. This expands the technological capabilities of the video.

The advantages of the invention over the prototype:

processing performance increases, because the part does not need to be reinstalled during processing:

the quality of processing increases, because OE and PE rollers are not separated by a groove;

the efficiency of straightening increases sharply, because the difference between r and R is not limited by anything;

expanding technological capabilities, because

a) the rollers have a complex configuration, which makes it possible to obtain different work-hardening depths when using one roller;

b) shafts with straight and curved generatrices can be processed;

it becomes possible to process shafts in automatic production on automatic lines, in flexible production systems, on PMG.

Claims (1)

Claim A knurling roller containing supporting and straightening deforming elements, and the radius R of the working profile of the supporting element R is made larger than the radius g of the working profile of the straightening element, characterized in that, in order to improve quality by intensifying the straightening process and expanding technological capabilities due to processing shafts with different curvature, the working profile of the roller is limited by a part of the ellipsoid of revolution and a truncated cone, the generatrices of which are tangent to the ellipsoid of revolution.