RU2087239C1 - Method of knurling lengthwise riffles - Google Patents

Abstract

FIELD: plastic metal working. SUBSTANCE: method comprises steps of multipass knurling of cross riffles on worked part by means of rollers providing depth of profile of said cross riffles equal to 0.5-0.8 of depth of profile of lengthwise riffles and then knurling lengthwise riffles by means of rollers. EFFECT: decreased deformation efforts, enhanced quality of products. 4 dwg

Description

 The invention relates to the machining of metals, in particular to rolling riffles.

 A known method of rolling riffles by means of a device for corrugating rolling rolls [1] Rolling of riffles occurs by feeding the rolls to the corrugated rollers and the rotational movement of the rolls and rollers.

 The complexity of the method lies in the presence of a number of transitional links, which contributes to the distortion of the corrugation profile and will not allow rolling deep grooves with a small pitch.

A known method of multi-pass rolling of riffles with periodic movement of the rolling rollers to the center of the workpiece. It is used to form splined depressions when large spacing and axial forces are not allowed due to insufficient tool strength or rigidity of the part [2]
The disadvantage of this method is the low resistance of the rollers. In this way, only small slots of a limited length can be rolled. The teeth of the rollers experience increased loads. The vibrations are amplified. These circumstances determine the low durability of the rollers, which leads to insufficient accuracy of the resulting riffles, and therefore the transverse rolling process is used only to obtain small inaccurate riffles on parts of mild steels and non-ferrous metals.

 However, in some cases, it is required for embedded parts fixed, for example, in plastic products, to perform deep corrugations with a fine pitch. Known methods lead to the "collapse" and crushing of the profile of the grooves due to great effort.

 The aim of the described method is to reduce the rolling force and improve the quality of the corrugations.

 This goal is achieved by the fact that according to the method of rolling longitudinal riffles by rolling rollers, first, transverse riffles are rolled onto the parts with a profile depth equal to 0.5 0.8 of the depth profile of longitudinal riffles, then longitudinal riffles are rolled.

 Using the method provides the ability to obtain deep grooves with a fine pitch on parts made of non-rigid metals.

Figure 1 shows a diagram of the rolling process,
in figure 2, view A in figure 1, traces of the rolling sequence,
figure 3 section B B in figure 2,
in Fig.4 section B In Fig.2.

 The method is as follows.

 The rollers 1 and 2 (Fig. 1) of the transverse corrugation are adjusted to a depth equal to 0.5 0.8 of the profile depth of the longitudinal corrugations h (selected empirically), and they are informed of the rotational movement with the transverse movement of the device. Parts 3 report rotational motion. There is a rolling of transverse riffles (Fig. 2), traces 4. Also, instead of rolling a transverse riffle, several ring grooves of a V-shaped profile can be cut, the diameter of the bottom of the groove in this case is no more than the circumference of the hollows of the rolled longitudinal riffles. Next, the rollers 1 and 2 (Fig. 1) of the longitudinal corrugation are adjusted to the full depth (Fig. 2), traces 5. The closer to the base of the corrugations, the greater the force when rolling. But since the rolling of longitudinal riffles does not occur along solid metal, but along transverse riffles or grooves, the rolling force sharply decreases. The quality of the corrugations on the workpiece is improving. In addition, a part made of non-rigid metal is less deformed.

 Example.

 The method is implemented as follows. For example, rolling riffles on the sleeve of a drain plug made of steel 20 with a pitch of riffles 2.2 mm, 1.1 mm high, 12 mm long. The part is processed on a multi-spindle machine. The outer diameter is sequentially processed with an accuracy of 0.06 mm, at the next position four ring grooves of the U-shaped profile are cut, the profile angle is 50, the bottom of the groove is radius R 0.25 mm, the diameter of the groove bottom is not more than the circumference of the hollows of the rolled riffles. The distance between the grooves is 2 mm, the extreme grooves are 3 mm from the ends of the rolling crown. Next, the longitudinal flutes are rolled by two rollers, a device from the cross support of the machine. The device provides synchronous rotation of the rollers. The rollers are adjusted to a depth equal to the depth of the profile of the longitudinal grooves by moving the device. Details report rotational motion. There is a rolling of longitudinal riffles.

Using the proposed technical solution allows you to:
provide the ability to obtain deep grooves with a fine pitch,
roll longitudinal corrugations on non-rigid metal parts,
improve the quality of riffles,
reduce rolling force.

Claims (1)

 The method of rolling longitudinal riffles by multi-pass surface treatment with knurled rollers with a profiled working surface, characterized in that first they roll transverse riffles with a depth of 0.5 to 0.8 of the depth profile of longitudinal riffles, and then roll longitudinal riffles.

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