SU1504073A1 - Device for mandrelling parts - Google Patents

Abstract

The invention relates to metal working and can be used for the manufacture of products such as sleeves. The purpose of the invention is to expand the technological capabilities by treating the outer surface of the part and increasing the range of sizes of the parts being machined. The device for walling contains two mandrels, one of which, the outer one, is made stationary, the second, inner one, is supplied by means of a fixed traverse, which is connected to the rod of the machine by means of skalok. In the traverse symmetrically to each rolling pin there are cams, made with two working protrusions. One of the cams is internal - for fixing the crosspiece on rolling pins, the second - external - for fixing the crossbar in brackets associated with the body. The working pressure of the coolant placed on the product in the working chamber is created by the interaction of the rollers with spring-loaded plungers of hydraulic cylinders, which communicate with the working chamber through calibrated holes. The cutting fluid, acting on the part, pushes it through the mandrels, thereby simultaneously processing the outer and inner surfaces of the part. 4 il.

Description

The invention relates to metalworking and, can be used in the manufacture of products such as bushings backfilling.

The purpose of the invention is the expansion of technological capabilities by treating the outer surface of the part and increasing the size range of the workpiece.

FIG. I shows a device for fitting the products in the initial position, longitudinal section; in fig. 2 - device in operation, longitudinal section; in fig. 3 is a section A-A in FIG. I; in fig. 4 is a section BB in FIG. I.

The device for placing the parts contains a case I fixed on the table of the machine or press, in which

An outer mandrel 3 is installed in the form of a die for treating the outer surface of the product 4, and a center 5 for chaining it. In the housing I, hydraulic cylinders 6 are installed, the cavities of which, together with the 2 communicating with the cavity of the central sleeve, form a coolant chamber. In the cylinders 6, spring-loaded plungers 7 are installed to interact with rolling pins 8 fixed to the machine tool or press by means of a bracket 10.

Rolling pins 8 are equipped with a yoke II, carrying a mandrel 12 for machining the holes in the product 4, scraps 13 and cams 14, made with two working protrusions — internal, which have bevels 15

WITH

for interacting with rolling pins 8 and bevels 16 for interacting with spring-loaded sleeves 7, and outer lugs 18 for interacting with fastened to body 1 by means of studs 19 and crown nuts 20: - with teiny 21. External mandrel 3 fixed to central sleeve 2 and to body 1 by means of screws 22 and a bracket 23 supporting the support 24 for removing the article 4 from the mandrel 12. The hydraulic cylinders 6 are fixed to the housing 1 by screws 25 and the brackets 26 supporting the stops 27 for engaging with the spring-loaded bushings 17.

The device is equipped with a mechanism for loading and unloading products (not shown).

The device works as follows.

In the initial position, when the rod 9 of the machine is in its extreme upper position, the loading mechanism through the groove in the bracket 23 delivers to the position of processing the workpiece 4, which through the hole in the outer mandrel 3 falls into the filled coolant cavity of the sleeve 2. viku 5. The loading mechanism is removed from the treatment area and includes a working stroke.

The rod 9 of the machine moves down and by means of the upper bracket 10, skalok 8, cams 14, spring-loaded sleeves 17 and crosshead 11 moves the mandrel 12 and | stern 13 down to touch with the workpiece 4 and deform its outer size to the size of the hole in the outer mandrel 3, those. After sealing the chamber in section, internal mandrel 12 — product 4 — external mandrel 3. The coolant displaced by internal mandrel 12 flows from the high-pressure chamber through holes in one of the hydraulic cylinders 6 (right) into a reserve container (not shown). The downward movement of the inner mandrel 12 continues until its level coincides with the cylindrical level with the cylindrical side of the outer mandrel 3. Fix the yoke 11 in this position. The shutters 13 close the grooves in the bracket 23 and prevent splashing of coolant from the treatment area.

The fastening of the crosspiece 11 in the position when the inner mandrel 12 is installed at the same level with the outer mandrel 3 in the absence of a gap between them and the product 4 is reached by installing the stops 27 to interact with the spring-loaded bushings 17. At the time the sleeves 17 exit the outer cylindrical part of the inner the protrusions of the cams 14 are able to move horizontally in the cross beam 11, which at this moment stops moving downwards.

Downward movement in this period of time together with the rod 9 of the machine tool is performed only by rolling pins 8, which, with the conical surface of the groove, interact with the inner bevel 15 of the cams 14,

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The last in the radial grooves of the crosspiece 11, made for technological purposes of folding from several parts, are touched by the external projections 18 of the grooves in the brackets 21, made like the crossbar of 11 collapsible. In this case, the spring-loaded bushings 17, by means of bevels 16 of the cams 14, are pressed upwards from the stops 27.

The fixing of the traverse 11 and the inner mandrel 12 is completed when the bevels 15 of the cams 14 cease to interact with the surface of the grooves at the skalok 8 and the internal surfaces of the cams 14 are fixed along the cylindrical surface of the skalok 8.

Upon further downward movement, the rolling pins 8 begin to move the spring-loaded plungers 7, the movement of which below the hole in the right hydraulic cylinder 6 creates a high coolant pressure in the chamber sufficient to push the product 4 through the stationary inner 12 and outer 3 mandrels at a speed corresponding to the speed of displacement of the plungers 7. the end of the treatment, due to the compressibility of the coolant lubricant, the speed of the product 4 increases and the product “shoots in the direction of the support 24. To decrease the speed of the“ shot of the product 4 and to reduce the system push, the plunger 7 - 8 rolling pin - piston rod 9 of the machine at the time of sudden pressure drop in the coolant chamber message gidrotsnlnndra peripheral sleeves 6 to the central sleeve 2 formed through calibrated holes in the sleeve 2.

At the end of the processing of the product 4, the force from the inner mandrel 12 and, consequently, from the cross beam 11, the cross beam 11 is removed under its own weight and the force of the springs of the sleeves 17 is lowered by the cams 14 to the lower plane of the grooves in the brackets 21. The movement of the machine shaft 9 is reversed.

The movement of the machine rod 9 upwards through the bracket 10 is transmitted to the rolling pins 8, which move relative to the crosspiece 11 until the grooves in the rolling pin -8 are set against the cams 14. In this position, the force of the springs on the sleeves 17 is transmitted to the bevels 16 of the cams 14 and moves the last to the center of the rollers 8 until the sleeves 17 fix the cams 14 along the outer cylindrical surface of the protrusions. In this position, the protrusions 18 of the cams 14 exit from the grooves of the brackets 21 and, when passing the end of the groove in the rolling pin 8, do not prevent the lifting of the traverse 11 together with the inner road 12 and the curtains 13 upwards. The product 4 is then calibrated against the opening. At the end of the stroke, the finished product 4 is removed from the processing zone through the loading and unloading mechanism and a new workpiece is loaded. At the time of unloading and loading of the product 4 through the hole in the hydraulic cylinder 6, the used coolant in the chamber is inflamed. The device is ready to process the next item. The cycle is repeated.

The proposed device, with minimal replacement of its parts (mandrels 3 and 12, centric 5), allows, on one machine or press, to produce high-quality machining of sleeve-type products on two surfaces in a wide range of diametrical sizes and lengths, i.e. significantly expands technological capabilities

Claims (1)

Invention Formula A device for fittings, comprising a housing with a coolant chamber, an upper support for the product and brackets, as well as a traverse, which is fixed in brackets by means of movable stops and associated with rolling pins, and a mandrel with a mandrel, characterized in that in order to expand technological capabilities five 0 by treating the outer surface of the part and increasing the size range of the parts to be machined, the device is equipped with a filler for treating the outer surface, hydraulic cylinders with spring-loaded plungers, additional brackets and calibrated holes, spring-loaded bushings and additional stops. The coolant is installed in the upper part of the chamber, and the hydraulic cylinders are connected to the above chamber by means of potassium holes, and the hydraulic cylinders' plungers are installed with a possibility of interaction with rolling pins, the spring-loaded bushings and movable stops are located on the calves, the latter are made in the form of cams with internal and external working protrusions for fixing the crosshead on rolling pins and in the brackets, with additional stops mounted on the brackets of the hydraulic cylinders with the ability to interact with spring-loaded tulkam and mandrel with mandrel fixed on the traverse. Sh 18 . 2 ten Phage.2. eight // 19 7 I 11 26 25 21 15 Fig.Ch / 3 // // 26 nineteen 21