SU1618528A1 - Broach having inserted cutting edges - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to instrumental production. The purpose of the invention is to reduce the labor intensity of adjusting the assembly assembly by reducing the contact between the moving elements of the tool. The draw contains a mandrel 1 on which the rear bush 7 is placed, calibrating 4, intermediate 6, finishing 3, rough 2 blocks and screw block 5, acting as an axial displacement limiter, intermediate thrust sleeve 8. These elements are tightened with a nut 9 and fixed This position of the shank 10, wrap the erg until it stops. In operation, blocks 4, 6.3, 2 and 5 are worn out and do not keep the required size or purity of processing. Needs them peretochka or readjustment. For this, the lock nut 12 is loosened and the movable stop 11 is moved to the right. The rotation of the nut 9 displaces the elements 8,5,2,3, b, 4 and 7 of the stretch along the mandrel 1 to the right and to the left, while all the screw blocks unwind, increasing in diameter to the desired size. After that, their position is fixed, the stop 11 is secured with a lock nut 12, and the shank 10 is also screwed in to the stop. Make a regrind. 1 il.

Description

The invention relates to mechanical engineering, in particular to tool production.

. The purpose of the invention is to reduce the complexity of adjusting the complete tool by reducing the contact between the movable elements of the tool.

The drawing shows a broach, General view.

The collection broach comprises a conical 10 mandrel 1 with one or more transitional conical surfaces. Cutting teeth in the form of spiral blocks are placed on the mandrel 1: rough 2, fine 3. calibrating 4, spiral block 5, acting as a limiter of axial displacements, and technological block 6 with a smooth outer surface, the outer diameter of which is smaller than the outer diameter of the spiral blocks, and technological block 6 is installed only before transitions of one conical surface to another or of a conical surface to a cylindrical one. So the technological unit 6 is installed in front of the calibrating unit 4 during the transition of the conical: mandrel to cylindrical. At the end of the set of blocks, a rear guide 7 is installed in the form of a sleeve worn on the cylindrical part of the mandrel 1. In front of the input block 5 are an intermediate stop sleeve 8 and a tightening nut 9. A movable threaded shank 10 is screwed onto the front threaded end of the mandrel 1. On the rear threaded end of the mandrel 1 placed a movable stop 11, the fixation of which is carried out by a lock nut 12.

Assembly broaches produce in the following order.

A movable stop 11 is screwed onto the threaded end of the mandrel 1 close to the end of the cylindrical part of the mandrel and fixed with a lock nut of the mandrel on the cylindrical. At the end of the set of blocks, the rear guide 7 is installed in the form of a sleeve worn on the cylindrical part of the mandrel 1. In front of the input block 5 there is an intermediate stop sleeve 8 and a tightening nut 9. A movable threaded shank 10 is screwed onto the front threaded end of the mandrel 1. On the rear threaded end of the mandrel 1 placed a movable stop 11, the fixation of which is carried out by a lock nut 12.

Assembly broaches produce in the following order. A movable. Screw 11 is screwed onto the threaded end of the mandrel 1, close to the end of the cylindrical part of the mandrel and fixed with a lock nut 12. Then, the rear guide sleeve 7 and the calibrating unit 4 are installed on the cylindrical part of the mandrel 1. Next, the calibrating 4, intermediate 6 , finishing 3, draft 2 and guide 5 blocks. The blocks assembled in this way are tightened tightly using the thrust sleeve 8 and nut 9 installed behind them. All elements of the broach assembled in this way are fixed by the shank 10, screwed onto the front threaded end of the mandrel 1 until it stops in the nut 9. The broach is ready for operation. After a certain number of hours of operation, broaching teeth made in the form of blocks15 wear out and do not hold the required surface size or frequency. To eliminate this drawback, a regrind of the teeth is required.

To prepare the broach for regrinding the teeth, it is necessary to loosen the lock nut 12. Rotating the movable stop 11 to the right, move its contact with the lock nut 12. Then, turning the nut 9, displace all the elements 8, 5, 2, 3, 6, 4, 1 and 7 of the broach, located on the mandrel 1 to the right. In this case, all spiral blocks are untwisted by a certain amount, increasing in diameter. Upon reaching a certain increase in the diameter of the cutting teeth, sufficient for regrinding, all elements on the mandrel are secured by rotating the stop 11 and locknuts 12 in the opposite direction, and the shank 10 is screwed to the stop. After this, the broaching teeth are regrind.

Using the ability to smoothly move all the elements of the broach on the mandrel 1 along its axis to the right and left, you can re-adjust the broach to handle holes with different fits. For this, it is necessary to carry out a broach so that in the initial position of the elements 5, 8.2, 3. 6, 4 and 7, it processes holes of a nominal diameter.

When you move all of these elements to the extreme right position receive machined holes with increased upper tolerance E. When moving, placing all of these elements on the mandrel to the far left position receive machined holes with increased lower tolerance E.

Claims (1)

The claims A combined broach, on a conical mandrel of which spiral cutting roughing and finishing blocks are sequentially placed, separated by axial displacement stops, an emphasis and a nut, characterized in that, in order to reduce the complexity of adjusting the length of the assembly, the emphasis is mounted with the possibility of axial displacement and locking in a predetermined position, and the axial displacement limiters are made in the form of spiral blocks placed with the possibility of axial displacement. Compiled by V. Slitkova Editor A. Kozoriz Tehred M. Morgenthal Corrector M. Sharoshi Order 12 Circulation Subscription VNIIIPI of the State Committee for Inventions and Discoveries under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.