SU1604583A1 - Arrangement for dressing grinding wheel - Google Patents

Abstract

The invention relates to abrasive machining and may find wide application in editing the abrasive tool used in grinding operations with increased demands on the quality of the surface layer. The aim of the invention is the expansion of technological capabilities due to the formation on the working surface of the grinding wheel of a regular macrorelief with a variation of its density in a wide range. The device includes a housing 1, a drive disc 6 with a friction coating, mounted on shaft 2, an overrunning clutch, central wheels 10 and 11, discs of right-handed tools 3 and 4, inertial rollers 12, 13. The overhang 7 of the overrunning clutch is rigidly connected to the drive disc 6 , and the sprocket 9 is rigidly fixed on the shaft 2. The inertial rollers are rotatably mounted on axles 16. The axes 16 are rigidly fixed on the sliders 17. Two pairs of rollers have a constant radius of inertia, and the other two are adjustable. Depending on the pre-calculated angle of rotation of the right tool 5 relative to the drive disk 6, the required inertia radius is set. The magnitude of the angle of rotation determines the parameter of the formed macrorelief. The rotation of the drive disc 6 through the overrunning clutch is transmitted to the right tool and inertial rollers, which, rolling on the wheels 10 and 11, create inertia forces, due to which their angular velocity increases. As a result, the angular velocity of the right-hand tool increases and a turn is made to the required angle. 2 Il.

Description

The overrunning yoke 7 is rigidly connected to the driving disc 6, and the sprocket 9 is rigidly fixed on the shaft 2. The inertial rollers are rotatably mounted on the axles 16. The axes 16 are rigidly fixed on the sliders 17. Two pairs of rollers have a constant radius of inertia, and the other two are adjustable. Depending on the pre-calculated angle of rotation of the right tool 5 relative to the drive disk 6, set the required radius

inertia. The magnitude of the angle of rotation determines the parameter of the formed macrorelief. The rotation of the drive disc 6 through the overrunning clutch is transmitted to the right tool and the inertial rollers, which, running on the wheels 10 and 11, create inertia forces, which will fall asleep increasing their angular velocity. As a result, the angular velocity of the right-hand tool increases and a turn is made to the required angle. 2 sludge.

The invention relates to abrasive machining and can be widely used for dressing abrasive tools used in machining operations for grinding parts with increased demands on surface quality.

lay

The purpose of the invention is the expansion of technological capabilities due to the formation on the working surface of the grinding wheel of a regular macrorelief with a variation of its density in a wide range.

Figure 1 shows the diagram of the proposed device: figure 2 - section aa in figure 1. The device consists of a housing 1 (see Fig. 1), on bearing supports of which a shaft 2 is mounted, carrying disks 3 and 4 of right-hand tools with carbide conical plates 5 rigidly fixed on their periphery, drive disk 6 with a friction coating mounted on it, mounted rotatably on the shaft 2 and connected to the shaft 2 via an overrunning clutch consisting of a sleeve 7 rigidly connected to a driving disk 6, rollers 8 and an asterisk 9 rigidly fixed on the shaft 2; two central wheels 10 and 11 mounted coaxially with the shaft 2 and rigidly mounted on the housing 1; four pairs of inertial rollers, two pairs of which have a constant radius of inertia Gi1 const (figure 2, pos.12), and two pairs of others have an adjustable radius of inertia hy2 Var (figure 2, П03.13), and on inertial rollers 13 with an adjustable radius of inertia rigidly fixed threaded axles 14, bearing nuts 15 (figure 2). The inertial rollers are mounted rotatably on the axes 16 (Fig. 1), rigidly mounted on sliders 17 having the possibility of radial movement along the guide discs 3 and 4 of the right tool, arranged along

the periphery of the central wheels 10 and 11 and pressed to them by means of springs 18.

Preparation of the device for operation and its operation are as follows.

Depending on the pre-calculated angle of rotation of the right-hand tool relative to the drive disk 6, by means of nuts 15 on a scale of 19 (FIG. 2) 0, the required inertia radius Gi2 is set. The device is installed on the machine table, the grinding wheel which is previously melted in a known manner is brought into contact with the tension with the friction coating of the drive disk 6 and sets it to rotate together with the driving disk 6 at a speed Ukr. The rotation of the drive disk 6 through the overrunning clutch is transmitted right - w, the tool together with the inertia rollers, which, rolling around the central wheels 10 and 11, create inertial forces, which increase the angular velocity of the inertial rollers hell by the increment value L i) 2 (figure 2). Accordingly, taking into account the gear ratio of the central wheels 10 and 11 and the inertial rollers, the angular speed of the right tool increases by the increment Awi, which, in turn, 30 determines the angle of rotation of the right tool relative to the drive disk 6. The overrunning clutch, providing a one-sided increment of the angular velocity Dol, allows you to maintain this angle of rotation when the direction of inertia force vector changes to the circumferential velocity of the circle opposite to the vector. During the time period of the 1 stroke of the grinding wheel with the driving disk 6, carbide plates 40 are embedded in the body of the wheel, the abrasive macro-volumes of the bond are punctured to form a macrorelief. By adjusting the right tool relative to the drive disk 6 to the required angle, the macrorelief is regular.

The proposed device, due to the presence of inertial rollers with a constant radius of inertia and adjustable radius of inertia, allows varying the angle of rotation of the right tool relative to the drive disk over a wide range, and therefore, controls the working surface of the grinding wheel in a wide range depending on processing conditions, characteristics of the grinding wheel, changes in its diameter during operation with a substantially simple setup of the device. The application of the proposed device allows to significantly reduce the temperature-forcefulness of the grinding process, performed by the grinding wheel with this device applied on its working surface with a regular macrorelief.

Comparative experimental studies of grinding a plate made of 12KhNZA cemented steel (HRC 56 ... 62) on a ZG71 surface grinder showed that when using a 24A25HCM16K5 grinding wheel. on the working surface of which a regular macrorelief is formed, the contact temperature in the cutting zone, depending on the grinding conditions, is in the range of 180-600 ° C, and the contact temperature when using the grinding wheel of the same

brand, but melted in a known manner (diamond metal pencil grade C4), is in the range of 200-920 ° C, i.e. 1.1-1.5 times higher than in the first case. Accordingly, the cutting force in the first case is 1.15-1.2 times less than the second.

Claims (1)

Invention Formula A device for dressing the grinding wheel, comprising a housing with two bearing supports, a shaft, a drive disc with a friction coating and a driving tool disk rigidly mounted on the shaft, characterized in that, in order to expand technological capabilities by varying the density of the macro relief in a wide range, the device is equipped with an overrunning clutch, the cage of which is rigidly connected to a driving disk mounted rotatably relative to the shaft, and an asterisk is rigidly fixed on the shaft, and two central wheels rigidly fixed to the housing are concentric to the shaft, while the disk of the right-hand tool is equipped with inertial rollers evenly spaced around the circumference with the possibility of elastic contact with the periphery of the central wheels, two pairs of which are made with a constant eccentricity of masses, and the other two are adjustable . -G