SU1692774A1 - Method of broaching coaxial holes - Google Patents

Abstract

The invention relates to metalworking and can be used in the processing of several coaxial holes of different diameters. The aim of the invention is the expansion of technological capabilities. This is achieved by the possibility of pulling coaxial holes of different diameters. Pulling is performed with cutting-deforming piercing with working sections 2, 3, 4, containing smooth front guide parts 5, rear guide parts and axial bore holes. Before processing, each section 2, 3, 4 is inserted by the front guide part 5 into the corresponding machined hole of the housing 1, and then the centering mandrel 6 is inserted into the axial hole of the extreme section 2. The mandrel is closed with section 2 with quick-release lock washer 8. which inserted into the annular groove of the mandrel 9, and, abutting it against the end of section 2, pierce the extreme large hole DL. Then disconnect section 2 with mandrel b and close mandrel 6 with section 3, etc. 8 il. & fe

Description

The invention relates to metalworking and can be used in the processing of several coaxial holes of different diameters, made in parallel walls of the housing.

The aim of the invention is the expansion of technological capabilities achieved due to the possibility of pulling coaxial holes of different diameters.

Figure 1 shows the firmware during processing of the inlet (larger) hole; figure 2 - the position of the firmware. at the beginning of the processing of the intermediate hole; fig.Z - the same, at the end of processing the intermediate hole; figure 4 is the same, at the beginning of the processing of the outlet; Figure 5 - the same, after flashing the outlet; figure 6 - the same, before the return stroke of the rod; 7 and 8 diagrams

pulling both the intermediate and the outlet from the base inlet at the same time.

The method of the embodiment shown in Figs. 1-6 is carried out as follows.

Case 1 with three coaxial holes Di, D2, Oz, forming stepped holes of the type Di Da Oz, has limited access to the intermediate hole through the windows (not hatched). The processing of the housing 1 is carried out with cutting and deforming piercing with working sections 2-4 with a smooth front guide part 5 and a rear guide part consisting of snagging teeth, made so that the front one has the largest size and the rear ones are understated by not exceeding the tension between the front tooth and the surface of the hole. This will allow ne10

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the middle tooth should provide the most correct hole shape and eliminate the influence of the others, since they have less tension.

Each working section is inserted before flashing into the corresponding holes with a gap g (section 2 in the hole DI, section 3 in D2. Section 4 in Oz). Start with a smaller hole Oz, then 02 and finish with a DL hole. To pierce the hole DI, a cylindrical mandrel 6 is inserted into the axial mounting hole of section 2, rigidly connected to the stem 7 of the extension machine, closed with a quick-release lock washer 8, and first pierce the extreme hole to the exit of a larger, impure tooth forming the final size. 1 t In this position, the rod 7 is stopped and retracted 1-2 mm back (not shown) to release the washer 8, which is removed from the annular groove 9 of the mandrel 6, and then the mandrel b is inserted into the axial seating hole of section 3 (Fig .2), not making a 1-2 mm groove 9 to the upper end of section 3, close it with a washer 8 and pierce the second (intermediate) hole (fig. 3) reducing its misalignment to

()one.

At the same time, the mandrel 6 is centered on the landing axial bore of section 2 as if it were on the junction, ensuring coordination of section 3 from the possible displacement by radial cutting forces.

Next, the techniques are repeated until all the holes are fully processed, ensuring the coordination of section 4 along the mandrel 6, which is centered on the opening of the previous section 3 and reduces the misalignment e to

()one.

To remove the firmware from the holes, section 4 is closed with a second washer 11 (FIG. 6) with a mandrel 6 installed in the groove 10 and pressed out section 4, and then 3 and 2 with a reverse stroke of rod 7 and remove all sections from the holes.

FIG. 7 and 8 shows the second version of the firmware. Case 1 does not have access to the intermediate hole. Sections 2-4 have a front guide part 5 and are mounted on a stepped mandrel 6. At the same time, the mounting holes of the sections satisfy the relation di d2 da, where di, d2, da are the holes of the sections for processing the input, intermediate and output openings.

Firmware is executed and subsequently always installed so that the firmware

the inlet has the largest diameter and the outlet has the smallest. The mandrel 6 is set in the desired coordinates L is rigidly connected to the rod 7 of the machine.

A quick-detachable thrust washer 8 is inserted into the annular groove 9 of the mandrel 6. The same annular washer 11 is inserted into the lower annular groove 10. The tabs 12 and 13 of the mandrel 6 are in contact with sections 3 and 4.

The method is carried out as follows.

Before stitching, sections 2-4 are put on the mandrel 6 and washers 8 and 11 are inserted. Then all sections are inserted into the holes, with

Thereby, the distances Li and La between the groove 9 and the steps 12 and 13 are designed so that sections 3 and 4 will start to work when section 2 comes out of the inlet DI (Fig. 7). After section 2 leaves the inlet opening Di, the washer 8 is removed and, using section 2, as a conductor sleeve, the remaining holes D2 and Oz are pierced, I will act with ledges 12 and 13 on section 3 and 4 in the axial direction. As soon as the largest pulling teeth of sections 3 and 4 come out of the holes Da and Oz. reverse section of the extrusion of all sections of the holes. Other setup options are possible.

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Claims (1)

Invention Formula The method of pulling coaxial holes, in which the processing is performed during the forward and reverse course of the cutting-deforming firmware, the working section of which contains the front and rear guide parts, characterized in that, in order to improve the accuracy in the processing of stepped holes, The firmware consists of several working sections with axial bore holes, a cylindrical mandrel with two annular grooves and two lock washers; the working sections are equal to the number of holes to be machined; in this case, before the start of processing, each working section of the firmware is installed with the front guide part into the corresponding the opening and at the forward stroke begin the sequential machining of the holes, starting at the extreme, inserting the mandrel with the lock washer installed in the annular groove of the corresponding working section, and during the return stroke the second locking washer is additionally installed in the second piercing hole. US figure 1 FI.2 /. 3 . H g / 6 , 6 tf FIG. b FIG. 7