SU1484490A2 - Broaching rest for gear-hobbing machine - Google Patents

Abstract

The invention relates to the field of metalworking and can be used when cutting the wheels of conical spiroid gears. The purpose of the invention is to improve the processing accuracy by providing the same depth of the longitudinal modification of the opposite side surfaces of the teeth when cutting a conical spiroid wheel. In the spindle of the sliding caliper, two cutters-blowers 7 and 6 are installed with the ability to interact with two wedges 4 and 5. The wedge is mounted in the axial bore of the spindle so that the centers of circles of the longitudinal profiles of the side surfaces of the first wedge are located in the same plane as the centers similar profiles of the second, and are made with the values of the radii of the arcs of these circles, selected from ratios composed of the radii of the circles of the same longitudinal profiles of the side surfaces of the wedges and equal to the coefficient, the numerical the value of which is chosen depending on the ratio of the dividing angles of the profiles of the lateral cutting edges of the cutter-bat. Cutters-volts 6 and 7 are placed in 2 radial holes 16 and 17, which are made in the spindle, whose axes are located in the same plane. 9 il.

Description

The invention relates to metalworking, can be used when cutting the wheels of conical spiro gears and is an improvement of the invention according to the main author. No. 1022783.

The purpose of the invention is to improve the machining accuracy by providing the same depth of the longitudinal modification of opposite sides of the teeth of the cut wheel.

FIG. 1 shows a kinematic diagram of a sliding caliper, in FIG. 2 shows a design of a part of the proposed sliding caliper adjacent to the fixed bearing support of its wedges {fig. 3 - the design of the part of the caliper located in the area of processing of the spiroid wheel; in fig. 4 is a view A of FIG. 2; in fig. 5 is a section BB in FIG. 3; in fig. 6 is a section bb of FIG. 3; in fig. 7 is a view of FIG. 3; in fig. 8 and 9 are variants of the location of the incisors-volatiles, forming the right and left surfaces of the teeth of the spyroid wheel, respectively, relative to the corresponding wedge.

A sliding caliper to a milling machine consists of a body 1 carrying a spindle 2, in the axial bore 3 of which a wedge 4 and a wedge 5 attached to it are arranged to interact with the cutters 6 and 7, respectively. the spindle 2 is rigidly connected to the gear wheel 8 and with the possibility of relative rotational movement of the lead screw 9. In the hole 3 of the spindle 2 there is a rod 10 connected at one end with the wedge 4, and the other with the bearing support

11, placed in a beaker 12, connected by means of a plate 13 and a gasket 14 to an additional slide support 15, which is movable relative to the housing 1.

Cutters-volts 6 and 7 are installed in 2 radial holes 16 and 17, which are made in the spindle, whose axes are located in the same plane. The distance between the axes of these holes was chosen to be 2PX, where P is the axial pitch of the turns of the spyroid screw, which engages

5 gos with the cut wheel,

 To release air from the cavity, the hole 3 in the spindle 2 has an opening 18. A groove 19 formed by the wedges 4 and 5 and a radial hole

0 20 serves to insert the incisors-volts 6 and 7 into conjunction with these wedges. The cutters-volts 6 and 7 have grooves 21-24, with the grooves 21 and 23 being working, with the side surfaces of which the side surfaces of the wedges 4 and 5, respectively, and the grooves 22 and 24 are in contact with each other. The portions of the incisors-volts 6 and 7, located between these grooves, interact with the recess 19 with the possibility of movement.

The right and left side cutting edges of cutters 6 and 7, respectively, are made on the producing surfaces of the coil of the producing worm; Other left and right side cutting edges of these incisors are made inside the coil of the said producing worm with an offset from its respective producing surfaces by Sb and Sg, respectively. The minimum allowable values of St and SR are 0, 07-0.05 mm and 0.02, 0.01 mm, respectively, with dividing values

five

0

the angle profile of the right side cutting edges of the incisors-volts 8-18,

The longitudinal profiles of the convex side surfaces of the wedges 4 and 5 are outlined by circular arcs of radii R 3 and R, respectively, and the longitudinal profiles of the concave side surfaces of these wedges are circular arcs of corresponding radii R4 and R4. The centers of circles of radii R3 and R4 are located in the same plane as the centers of circles of radii R t and R4 inclined to the end plane of spindle 2 at an angle & t is equal to the angle of the cone producing a worm, realized by the incisors-blows 6 and 7, having a value equal to the value of a similar angle of a spiroid worm hooking with the cut wheel.

The ratios of the radii of the arcs of the circles of the same longitudinal profiles of the side surfaces of the wedges 4 and 5 are chosen equal

51 p

Rt × where n is a coefficient equal to 1,151, 6 with the ratio of the dividing angle about the profile of the left side cutting edge of the cutter to the dividing angle oЈR the profile of the right side cutting edge equal to olL

 2.2-2.8. Radius values

in this relationship, the dependencies of

RRRR

rR + R,

, 75RRsecS, -, where R 4i5 + (&,) 2 (84)

)

the length of the working groove of res.ts-flyers;

the maximum permissible length of the wedge distance between the extreme left and right positions of the cutter-bat axis; the width of the rim of the wheel being cut, measured in the plane drawn through the axis of the spindle 2 parallel to the axis of the wheel; the magnitude of the removal of the arc of a circle of the right de

0

five

0

five

of the worm-shaped surface realized by the incisor-blades from a straight line tilted to it, tilted to the spindle axis at an angle о, is set at a distance of 0.5 from the point of contact of these arcs and straight and is equal to 0.25 0.16 and 0.15-0.1 mm for coal, 2, equal, respectively, 8-12 and 13-18 °,

the radius of the arc of the circumference of the longitudinal profile of each of the side surfaces of the working groove of the cutter-bat 7. At the specified curvilinear shape of the longitudinal profiles of the side surfaces of the wedges 4 and 5 and the simultaneous constant perpendicularity of the axes of the bit cutters 6 and 7 to the axis of the spindle 2 the longitudinal profiles of the side the surfaces of the working grooves 21 and 23 of these incisors in order to avoid jamming in the movable joints of the latter with wedges 4 and 5 must be necessarily convex and outlined by arcs of circles

0

five

0

five

0

radii Hz and rR, where

Gb

rR.n pa5

Dius arc of a circumference of the longitudinal. the profile of each of the side surfaces of the working groove of the cutter-bat 6. The centers of these circles are arranged in planes inclined to the end plane of spindle 2 at an angle of 8, and grooves 21 and 23 crossing the longitudinal symmetry axes at points equidistant from the line of intersection of the external cylindrical surfaces of the cutters - gouges 6 and 7 with flat surfaces of these slots 21 and 23.

The incisors-volts 6 and 7 are mated with the wedges 4 and 5 so that their cutting edges are located on the side of the concave side surfaces of these wedges.

When the sliding caliper is working, the spindle 2, and with it the cutters-flyers 6 and 7, receive a rotational movement from the gear wheel 8, and an axial movement from the spindle 9. Here, the points of the right and left side cutting edges of the incisors 7 and 6, respectively, describe the helixes on the coaxial rotational surfaces which form arcs of circles respectively of the radii RR and R,

facing the convex sides to the axis of the spindle 2. The combination of these screw lines determines the producing surfaces of the coil of the producing screw, which ensures the same depth of the longitudinal modification of the opposite side surfaces of the teeth of the cut wheel.

Claims (1)

Three positions of incisors-volts 6 and 7 on wedges x 4 and 5 are possible: the left extreme, in which the cutter-blades move along the wedge in the direction to the additional slide bearing of spindle 2 is limited by the length of the groove 19 (for cutter-bat 6, it is possible with the cutter removed - to a bat 7), central, when the coil is 0 (, 02, Ohm and Op (or centers 0 | ° 4 ° n and ° n) of circles delineating the profiles of the side surfaces of the wedge and the working groove of the cutter-lettuce) are located in the same the same plane inclined to the spindle 2 end plane at an angle S1 V right extreme at which The rum cutter-flyout comes out of mating with a wedge or enters it. Extended caliper to the gear milling machine according to auth. No. 1022783, 844908 characterized in that, in order to increase the machining accuracy, the caliper is provided with a second wedge designed to interact with the second cutter-bat, made structurally identical to the first spindle installed with it in the axial bore of the spindle or the center of the circumferential profiles of the side surfaces wedges in one plane, while the radii of the arcs of the circles are related by } 5a R4 r where R and R,  P. R4 and R4 n the radii of the arcs of circles convex longitudinal profiles of the side surfaces of the first and second, respectively, wedges; radii of arcs of circles of concave longitudinal profiles of the side surfaces, respectively, of the first and second wedges, a coefficient equal to 1.15-1.6. 12 ten LZI View | 7777777ЯЗГ-шj 1484490 18 15 - Fig4 SWCb 06 7 "78Vl lf oewvi FIG. s