SU781026A1 - Stand for measuring radial movement of tool - Google Patents

Description

(54) STAND FOR MEASUREMENT OF RADIAL MOVEMENT OF TOOL

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The invention relates to mechanical engineering and can be used in the study of transverse vibrations of a tool for machining deep holes and, above all, a tool for deep drilling with an external supply of coolant.

A stand is known for measuring the magnitude and direction of the radial interleaving of the instrument, in which the gauges are removed from the treatment zone and are located outside the fixed tube containing the working head. Radial holes are made in the pipe, in which pins are installed, one end in contact with the head body and the other end with gauges. The stand has wide possibilities in relation to the size of the boring heads being examined. However, this stand cannot be used to measure radially its movement of the working head when machining deep holes with external coolant supply. This is due to the fact that the sample to be processed is installed with a gap of relative to the inner surface of the pipe. The disadvantage of this glass is also that the working head is not based on the surface of the hole being machined, but on the precisely machined surface of the fixed pipe. In this connection, the conditions for conducting experiments do not correspond. These conditions correspond to the actual processing conditions, which reduces the value of the research results. In addition, this stand is not suitable for dynamic

0 studies, especially under the high cutting conditions typical for drilling. This is due to the lack of, precisely rigid installation of the sample being processed, which relies on

15 screws fixed in a fixed pipe, rotatable relative to the supports.

Also known stand,. Containing a boring-head, mounted on

20 boring bar, holder for installation of the sample to be processed (sleeve) and measuring device in the form of a mandrel with strainers. Strainer in contact with the body boring

25 heads, with one row of strainer beams placed inside the case and the other outside 2.

The disadvantage of this stand is the limited range of x30 follower tools. It can be used only for boring shafts, and of such a size, with which the mandrel can be placed inside the head body with strainer bar. For similar measurements when drilling deep holes, the stand is unsuitable, since when the working year is located in a blind hole, which is characteristic of drilling, it is not possible to install a mandrel with head tensioner GO. The disadvantages of the stand are also the inconvenience of the calibration of those. goiter, located inside the head, the influence of temperature factors on the accuracy of Izmerein, the likelihood of active coolant on the gauges. The purpose of the invention is the expansion of the nomenclature of the investigated instruments. This goal is achieved by the fact that in 1 st, there is a tool in the form of a working head mounted on a boring bar, a holder for mounting the sample to be processed, an oil receptacle, one end of which is fitted with an oil seal / cover, and the other is tightly connected to the sample, and the measuring device with strainer legs, strainer gauge (the washing device is in contact with the open area of the borshtangi near the oil receiver. The oil receiver body at the junction of the bore bar is made with respect to it with a gap that provides The required radial displacement of the boring bar. The body of the seal, sealing this gap, is installed with the possibility of radial movement and provided with a mechanical seal. When machining deep holes, especially when drilling when coolant flows into the cutting area under high pressure, it is difficult to measure the radial movements Along with, taking into account that the working head is rigidly connected to the boron bar. Radical displacements of the boring bar section adjacent to the head can be measured. By measuring the magnitude of the radial displacement / specified portion of the boring bar in two cross sections, it is possible to judge with sufficient accuracy the magnitude and ng of the Spraying radial displacement of the head, which causes the displacement of the boron tangi. However, it is also difficult to measure the displacements of the boring area adjacent to the head, when this site is located in the Hole. .. -, -. „H -, -.-. ,: L,.-... l 7 th -; - 1 -.- These difficulties can be eliminated i if drilling the oTBelxifkS in a sample of small length to measure the displacements of the boring section adjacent to the head in the open area behind the oil terminal. With this, the removal of contact points of the strain gauges of the measuring device from the zone of the working head to the open zone of the boring bar virtually eliminates the constraints on the inventory of the studied instruments. However, the implementation of this universal measurement scheme has a practical idea only if the borchangi section, located in the oil receiver, has the possibility of unimpeded radial movement under the force of the cutting force applied to the head, in the existing oil receivers of the Oogan, it rests on the body of the oil receiver installed in the front rack of the stack. In the proposed stand, the removal of contact points of the strain gauges with the tool into the open zone requires the removal of the boron support (11 drags in the oil receiver. This is achieved due to the gap between the boron bar and the oil receiver housing at the points of their junction and use of the radially movable boring bar assembly. The presence of the gap causes the need for its compaction, achieved due to the fact that the gland body sealing the gap, is installed with the possibility of radial movement and is provided with a mechanical seal. Moreover, the use of a rally-movable Due to the design features of the oil receiver, it is advisable to place the gauges in the open area of the boring bar near the seal assembly, since due to unimpeded radial movement of the boring bar section adjacent to the head in size and direction of its movement can be judged About the size and direction of movement of the head. At the same time, it is possible with sufficient accuracy to move from the displacements of the considered section of the boring bar to re-milling the head, since the distance from the head to the measured section is small (500-700 ml) compared to the tool length. It should be noted that in most cases it is sufficient to limit the study of the influence of certain factors, HanpHMet cutting modes, on the displacement of the boring bar, not the transition to the displacement of the head. This is due to the fact that movements of the boring bar section adjacent to the head reflect the head movements to a certain extent. For example, as the optimal drilling mode, it is advisable to adopt the mode in which, at equal conditions, with Cr, the transverse oscillations of the considered section of the boring bar are minimal. FIG. 1 is a longitudinal section of the stand, a general view; in FIG. 2, the node in FIG. one; in fig. 3 shows section A-A in FIG. one; in fig. 4 - measurement scheme implemented on the bench.

The proposed stand contains a tool for deep drilling 9 in the form of a working head 1 mounted on a boring bar 2, a holder 3 for setting the sample to be processed 4, an oil receiver 5 and a measuring device b.

To measure the radial movement of the tool in two cross sections, carried out in the open area of boring bar 2 behind the oil receiver 5, the measuring device b is made in the form of two racks equipped with pivoting brackets 7 in which the strainer 8 is strengthened. The tips of the strainer 8 contact with the boring bar 2, moreover, strainers are additionally pressed to the boring springs 9. Racks with strainer mounted on the bed stand.

Carrying out the points of contact of the strain gauges with the tool into the open zone of the boring bar behind the oil receiver requires both livers to allow the radial displacement of the boring bar section adjacent to the working head to be radially unhindered. To this end, the housing 10 of the oil receiver 5, mounted in the front pillar 11 of the stand at the articulated part of the boring bar 2, is made with respect to the latter with a clearance of 12. In addition, the node 13 of the removal in the oil receiver is installed with the possibility of radial displacement. The radially movable seal assembly 13 of the boring bar 2 includes a housing 14 in which the gland 15 is placed. For tightening the gland serves bushing 16 and a nut 17, which is screwed onto the housing 14. With the fully tightened nut 17, the gland 15 crimps the boring bar 2. The gland 15 has a small length compared to the diameter of the boring bar, and the body 14 and the sleeve 16 are provided with a gap of 12 relative to the booth. By itself, the consolidation unit does not prevent the bending of the boron atangi in the area passing through the compaction at a given moment in time. The housing 14 is installed with a gap 18 in the bore 19, made from the end of the tail section of the housing 10 of the oil receiver. On the side facing the end of the bore 19, the housing 14 is provided with a mechanical seal, for example, a rubber sealing ring 20. To seal the joint between the housing 14 and the end of the expansion point 19, the housing 14 is pressed against the end face of the point by means of a nut 21 screwed onto the housing 10 of the oil receiver. At the same time, the sealing ring 20 is in contact with the end face of the bore 19. However, the pressing force is such that the body 14 has the possibility of radial movement together with the boom of the bar 2, thereby not preventing the radial movement of the latter. In addition, the specified movement of the housing 14 is possible thanks to the gap 18.

It should be noted that the body 14 has a relatively small mass and is installed with the possibility of movement relative to the body 10 of the oil receiver with light friction, which practically does not change the parameters of the oscillating system of the tool and does not affect its radial displacement in the dimensions of the section bar.

The holder 3 for mounting the sample to be processed 4 can be made in the form of a pipe, one end of which is fixed in the chuck 22 of the stand, and the other is supported by lunette 23. In the holder (pipe) 3 on the treatment side; sample 4 is installed,

Claims (2)

5 made, in the case of drilling, in the form of a solid billet. The sample is fastened with screws 24 and. flange 25 with screws 26. Sample A has a conical protrusion by means of which it is tightly connected to the oil receiver 5. Sample length is 150-300 mm. At the same time, the distance from the end of the working head at the end of drilling to the point of contact of the strain gauges of the measuring device with the open section of the boring bar is small compared with the tool length. Boring bar 2 at one end is fixed in the cartridge 27 of the stand carriage. At the other end, the boring bar has a threaded shank for mounting and securing the working (drilling) head. 1. When using a large length boring bar, a support 2.8 is installed between the measuring device 6 and the stand carriage, supporting the boring bar. In connection with the use of a sample of small length, by changing the position of the support 28 along the tool, an imitation of the drilling depth is achieved. In the absence of a support 28, the drilling depth is equal to the length of the tool used. When setting up the measuring device 6, the swivel arms 7 with the strain grip 8 are installed so that the points of contact with boring bar 2 of one pair of strain gauges placed on different racks are in the same diametrical plane of the boring bar coinciding with the plane in which the cutting blade of the working head is located 1. At the same time, the contact points of the other pair of strainer beams are located in the plane perpendicular to this one. Calibration of the strainer is carried out by installing probes of known thickness between the tip of the strainer and boring bar. Before measuring in sample 4, the hole itself is machined by the head itself for the approach of the head. In doing so, the head is first based on the inner surface of the housing 10 of the acceptor 5, and then on the surface of the machined hole. The proposed stand works as follows. itip "A-hole-hole in sample 4 is a working one. 1 as a result of ndl | t | ig tShchSh) ylozhёSh: SIM rezhdy HOcrK iHi oT 1 peR | KShtsSh SCHSH7 Ё SHSHESHYSh§1zg1 iSh11; and - from the axis of the longitudinal axis of the head with fepffia T, the angular oscillations, driving the ish | Γ radial to the displacement of its cross sections, the head is affected by syras ..jjfy prefilled by the components of P,, R. and R, (Fig. 4). Bearing in mind that the head is rigidly connected to the boring bar 2, the radial transverse golrvki cause the boring bar 2 to bend (bend) the boring bar 2. Due to the lack of support for the boom in the oil receiver 5 due to the gap between the IUrSBy ––––––––––––––––––––––––––––––––––––––––––––––––––––––––– yrti6f ShyshG-1ShSh1rMyye boring rods in the installation zone of the tension-lock lok 8, pushed to the ngo rail; ShchavUts in a radial direction. In conjunction with the boring unit, the shifting unit and the compaction unit, which ensures hermetic sealing of the boring unit in the oil receiver. The radial displacements of the boring bar 2 lead to the bending of the shadow bars 8, the deformation of the thermal resistor fgpoir H by the appearance of signals in the recording equipment ;. ABOUT SCHOONE SUN Wp YGVODS I 1 SECTOR OF PEU, in two pope movements of river rivers 1-1 and 11-I, yryche gv: Ka3kdammeyo yyuyuyuYuYuTs displacement 1, 1D, Y, in daukh mutually per - pendykul rdazh planes. Taking into account that the distances E – j are small compared to the length L of the tool and, moreover, the cross section of the G – T is slightly removed from the width of the radial displacements of the working head. By knowing the displacement of Z, l, Y, it is possible to establish the spatial position of the boring section. Hof-o confinement between sections T-I and P-P, in which these movements are measured. Since E.'s distances are known, then the displacement amount is 2, 2., Y .Y and j1. Consider ifi complicated calculations we define 1g1; HEALTH OF THE HEAD. Thus, the proposed stand; Allows exploring the nomenclature of the research tools, because when examining the stand of any toolkit, it is independent of its design, size, method of coolant supply that radial borshaci shifts in the open area behind the receptacle can be made. The invention of the Stand for measuring the radial displacement of a tool when machining deep holes contains a tool in the form of a working head mounted on the bob), a holder for mounting the sample to be processed, an oil receiver, one end of which is fitted with a gland, encompasses the bushing, and the other end with a sample, and a measuring device with strainers, distinguished from and with a weight that, in order to expand the design of the investigated, measure) the measuring device is extended outside the working bare zone behind the oil cooler, the housing of the bastang in the place of articulation with boring bar to ypol yen with respect to it with a gap, ensuring the necessary radial movement of the boring bar under the action of rezayi forces, and the stuffing box sealing this gap is also installed with the ability to radiate displacement with a boring bar. it is supplied with face consolidation. Sources of information received in the survey during the examination 1.Authorial certificate of the USSR 525528, cl. B 23 Q 17/16, 08.25.76, 2. AvT5rskoe USSR certificate 420434, cl. At 23 Q 17/16, 03/25/74, Please note 13 j 7 „ 781026/5 shchi // 4