SU994141A1 - Boring mandrel - Google Patents

Description

(5) BORROUND FRAME

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The invention relates to the field of mechanical engineering and can be used in the metalworking industry for boring deep holes. ,

A known boring mandrel comprising a housing, a cutting block and a coolant supply system to the cutters along the radial channel 11.

however, this mandrel cannot be machined at the same time by several coaxial holes (i.e., stepped holes), there is no separate coolant supply in it.

The aim of the invention is to expand the technological capabilities of the mandrel.

The goal is achieved by the fact that, in the proposed mandrel, the cutters are installed in blocks, each of which is connected to a coolant supply system with a radial channel, the radial channels of the mandrel body and the block being connected to each other by means of a longitudinal

groove, and the block is mounted with the possibility of longitudinal movement. Coolant supply to the face and radial cutting blocks is carried out on separate channels isolated from each other, and the basic places of the blocks are made cylindrical forms.

FIG. 1 shows the proposed mandrel, a general view; in fig. 2 shows section A-A in FIG. one.,

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Claims (2)

The boring mandrel consists of body 1, radial 2 and end 3 cutting blocks. Longitudinal T-shaped grooves are made on the outer surface of the mandrel housing 1, along which radial blocks 2 move and fasten with keys 5 and bolts 6. An axial hole 7 is made inside the correction housing and connected to radial channels 8 for coolant supply. to radial blbkam 2. The coolant is supplied to the cutters 9 of the radial blocks 2 through the radial channels 8 of the mandrel housing 1 and the radial channels 10 of the housing 11 of the cutting block 2, which are interconnected by a channel 12. The radial channels 8 are provided with removable plugs 13. To enable the positioning of the radial blocks 2 in the longitudinal direction. along the mating cylindrical surfaces 14, the channel 12. is made in the form of a longitudinal groove. Coolant is supplied to the cutter 15 of the end block 3 through a channel 16, made in the form of a tube 17 located inside the axial shaft. 7 and insulated from it by means of seals 18, and channels 19, 20 and 21. The mating cylindrical surfaces k of the body 1 of the mandrel and the housing 11 of the block are made with a certain accuracy to adjust the tool blocks to the desired size outside the mandrel. The adjustment of the blocks 2 to the desired size is carried out separately from the mandrel as follows. The cutter 9 is installed and secured in the groove 22 of the tool block 2 for a certain size L. The calculation of the size L is carried out according to the formula, where D is the diameter to be machined, mm; d is the known diameter of the mandrel, m L is the distance from the mating cylindrical surface of the block body to the cutting tip, mm. Boring bar works as follows. Before installing blocks 2, it is necessary to unscrew the plug 13, which corresponds to the linear arrangement of this block. The preset chisel blocks 2 are mounted on the housing 1 to the corresponding landing place along the matching cylinder. with the help of longitudinal T-shaped grooves, keys 5 and bolts 6. To quickly change the cutting blocks, the fixing grooves 23 are made through them. Enough to unscrew. bolts 6 one-two obptptTa, and the incisal block, shifting it to the side, is easily removed. When machining the holes with large allowances on the end block 3, two diametrically placed cutters are installed. The cutting forces that appear during processing compensate each other, increasing the rigidity of the mandrel. In addition to the end block, several radial blocks are installed for machining the stepped holes. The number of radial blocks corresponds to the number of coaxial holes. Precise through holes can be machined with this mandrel. For this, the finishing tool is set after the cutting tool, but diametrically opposed to it to balance the cutting forces. During operation, the boring bar coolant enters directly into the cutting zone. When the cutter 15 of the face block 3 leaves the part 2k to eliminate splashing coolant, it is stopped by the control system. The technical and economic efficiency of the invention consists in expanding the technological capabilities of the boring bar (the ability to simultaneously process several coaxial holes, separate coolant supply, the ability to adjust the cutting blocks to the desired size outside the mandrel and removing large allowances in a single pass of the mandrel due to the use of several cutting blocks at once) and simplifying its design. The use of several cutting blocks simultaneously allows an increase in labor productivity by 1.5–2 times, and the preliminary adjustment of cutting blocks outside the mandrel reduces the time for auxiliary operations. Claim 1. A raster mandrel comprising a cylindrical body with incisors installed therein and a coolant supply system to the incisors along the radial channel, characterized in that, in order to expand technological capabilities, the incisors are installed in blocks, each of which is associated with the infeed system Coolant by a radial channel, the radial channels of the mandrel body and the block are interconnected by means of a longitudinal groove, and the block is mounted for longitudinal movement. 2. The mandrel according to claim 1, characterized with TeMj that coolant supply 5. - h to face and radial incisal. Sources of information, blocks carried out on separate, taken into account in the examination of isolated channels from each other, and the basic places of the blocks are made of the USSR USSR Certificate of Cylindrical Form.5 No. 332931, cl. B 23 B 29/03, 1970. J 20 JS S f8 G l 0fff.f fJ 8 7 fff wm, /