SU1303390A1 - Flexible abrasive band - Google Patents

Abstract

The invention relates to space: 1 as part of mechanical engineering and can be used in the finishing processing of spur gears. The purpose of the invention is to improve the accuracy of gear processing. This is achieved by the fact that the base I of the tape is provided with non-abrasive (non-working) sections 4 alternating with abrasive sections 3 (working) with constant pitch. The non-working areas are made with greater bending rigidity than the working ones, the basis of the first tape is rolled up to form a gear profile with teeth 2, the non-working areas are located on non-transitional curves, depressions and the tops of the contour teeth. Basics can be metallized with P11m. During the machining of the gear wheels, the centrifuge is introduced into the engagement zone between the wheels to be machined, and the center-to-center distance is determined so that. chtspna mites would. 1a less Hje side wheel clearance. The tape is subject to tangential movement, and the wheels are braked, while rea. There is a single-sided engagement of the belt with each wheel. Due to the application of sliding forces, the cutting forces are provided with a declination force. For BTOpoii processing, the sides: A by1 changes the direction of movement of the wheel mite. With two-pronged gearing, one of the wheels to be machined is the leading and provides the pressure of the second Ko.ieca. 2 Il. SO Oh with so with about

Description

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The invention relates to mechanical engineering and can be used in the finishing processing of spur gears.

The purpose of the invention is to improve the quality and accuracy of processing gears.

FIG. 1 depicts the proposed flexible abrasive tape; in fig. 2 - processing scheme of a flexible abrasive tape.

In the drawings, the following symbols are accepted: Sop is the thickness of the base of the working section of the tape; HP - the height of the working area of the abrasive belt; Sup is the thickness of the working section of the tape, taking into account the thickness of the abrasive layer; gp is the radius of rounding of the transition section of the initial contour; G is the radius of the rounding of the tooth tip of the initial contour; A is the center-to-center distance of the gear wheels to be machined; tnm is the spacing of the working and non-working sections of the tape; Sa is the thickness of the abrasive layer; SO |, SB, 0) 7 are the angular velocities of rotation of the drive roller and the wheels to be machined.

The base 1 of the abrasive belt is folded to form a toothed profile with teeth 2. The belt contains working (abrasive) sections 20

heat treatment) provides a stable formation of theoretically accurate tooth profiles according to the Olivier method, since the tight contour tends to retain its shape.

Due to the fact that the original contour ensures precise engagement with the teeth, the deformations to which the tape is subjected are insignificant, so that the tape can be performed with a metallized base having increased rigidity and, therefore, providing increased accuracy.

Bending abrasive tape works as follows.

The belt moves between the machined wheels 6 and 7, receiving movement, for example, from the actuator 9 through the drive roller 8. The drive can be driven by one of the wheels 6, or 7. The belt is tensioned by the roller 10 with the tension element 11. The wheels are machined 6 and 7 are set with an intercenter distance A taking into account the lateral and radial gaps, and the thickness Sup of the working sections 3 of the tape is chosen to be no more than the size of the lateral gap, and

ki 3, made with a thickness of Sop, and inequality of 25 Sop - less than the radial size of the

35

40

Barrel (non-abrasive) areas 4 of SOU thickness, and the flexural rigidity of the non-working sections 4 of the tape is higher than the flexural rigidity of the working sections 3, for example, due to the fact that the thickness Son is greater than the thickness of Sop with the same modulus of elasticity of the material in sections 3 and 4. On the surface working areas 3 an abrasive layer 5 of thickness Sa is deposited, and the thickness of the working sections of the tape with regard to the abrasive layer is determined by

S., |. Sop-f 2Sn (1)

and the tape thickness should not exceed the size of the side clearance for the pair of gears 6 and 7 being machined, between which the tape is installed with the possibility of receiving movement, for example, from a driving roller 8 with a drive 9 with closing the circumferential perimeter, for example, using a tension roller 10 s tension element 11, for example, of spring type. In addition, the base is made metallized.

The presence of non-working areas alternating with working constant pitch and placing them on the transition curves and tops of the teeth allow for each tooth of the wheels to be machined to create conditions that prevent cutting of the tops of the teeth in the area of the outer diameter and ensure accurate profiling of the active areas of the teeth.

By imparting to the base a preliminary pattern and the shape of the initial gear profile (for example, by rolling a ribbon made of spring steel to form non-working sections of greater thickness than workers, and after 45

50

The wheels are 6 and 7. By creating braking on the wheels 6 and 7, each wheel is machined in a single profile gearing on one side of the teeth. For processing the second side, the direction of the tape movement is reversed. Non-abrasive (non-working) areas 4 of the tape do not interfere with processing, since the radii of the transitional sections of the tape are smaller than the curvature radii of the tops of the teeth of wheels 6 and 7, and the radii rg of the curvature of the tops of the teeth of the tape are greater than the radii of curvature of the transition curves of the wheels 6 and 7. processing and in the state of two-profile engagement. In this case, pressing one of the wheels 6 or 7 to the other is necessary. The center-to-center distance A is established with an account of the thickness S.np of the abrasive tape.

As an example of the use of the proposed flexible abrasive belt, the process of machining gear wheels of gearboxes in the gearbox housing itself can be considered. The tape is held between the teeth of the wheels and a braking torque is applied to the wheels. One side of the teeth is processed, and in order to process the second side, the direction of movement of the abrasive belt must be changed. Thus, all surfaces of the gear teeth of the gearbox are machined, and in this case the technological bases are at the same time constructive, which leads to an increase in the machining accuracy of the gears.

Claims (1)

Invention Formula An abrasive belt is flexible, the base of which is made with a double-sided abrasive coating, characterized in that heat treatment) provides a stable formation of theoretically accurate tooth profiles according to the Olivier method, since the tight contour tends to retain its shape. Due to the fact that the original contour ensures precise engagement with the teeth, the deformations to which the tape is subjected are insignificant, so that the tape can be performed with a metallized base having increased rigidity and, therefore, providing increased accuracy. Bending abrasive tape works as follows. The belt moves between the machined wheels 6 and 7, receiving movement, for example, from the actuator 9 through the drive roller 8. The drive can be driven by one of the wheels 6, or 7. The belt is tensioned by the roller 10 with the tension element 11. The wheels are machined 6 and 7 are set with an intercenter distance A taking into account the lateral and radial gaps, and the thickness Sup of the working sections 3 of the tape is chosen to be no more than the size of the lateral gap, and Sop - less than the value of the radial angle. 5 Sop - less than the value of the radial angle. five 0 five 50 The wheels are 6 and 7. By creating braking on the wheels 6 and 7, each wheel is machined in a single profile gearing on one side of the teeth. For processing the second side, the direction of the tape movement is reversed. Non-abrasive (non-working) areas 4 of the tape do not interfere with processing, since the radii of the transitional sections of the tape are smaller than the curvature radii of the tops of the teeth of wheels 6 and 7, and the radii rg of the curvature of the tops of the teeth of the tape are greater than the radii of curvature of the transition curves of the wheels 6 and 7. processing and in the state of two-profile engagement. In this case, pressing one of the wheels 6 or 7 to the other is necessary. The center-to-center distance A is established with an account of the thickness S.np of the abrasive tape. As an example of the use of the proposed flexible abrasive belt, the process of machining gear wheels of gearboxes in the gearbox housing itself can be considered. The tape is held between the teeth of the wheels and a braking torque is applied to the wheels. One side of the teeth is processed, and in order to process the second side, the direction of movement of the abrasive belt must be changed. Thus, all surfaces of the gear teeth of the gearbox are machined, and in this case the technological bases are at the same time constructive, which leads to an increase in the machining accuracy of the gears. Invention Formula An abrasive belt is flexible, the base of which is made with a double-sided abrasive coating, characterized in that quality improvement when machining gears, the basis of the tape is made in the form of a gear profile, while the abrasive coating is located on all but the transition. parts of curves, edges and hollows of teeth, and non-abrasive areas have more, - greater flexural rigidity than a6pa3iiBin, ie, areas.