Method of hollow parts production with steps on external surface and cold-upsetting tool for its implementation

FIELD: technological processes.

SUBSTANCE: for parts production cold-upsetting tool is used in the form of multi-position unit. Unit includes five positions and contains puncheons, thrusters, assembled matrixes and strippers. Assembled matrix in the fourth position is installed motionlessly and is equipped with reduction step at the insert. Stripper of the fourth position is arranged with the opening, in which spring-loaded puncheon is installed. Cut billet is subjected to setting and calibration with leveling of butt ends and formation of conical marks. By means of further billet setting head is created. Then opening is pressed out in the billet and its external diameter is reduced with formation of step. Reduction of diameter is carried out in motionless matrix with insert, which has reduction step. For that purpose billet is displaced until it thrusts stripper with spring-loaded puncheon with its butt-end. Puncheon is installed in billet pressed out opening. Later billet is displaced together with puncheon and stripper via reduction step of matrix. After that billet opening is interweaved.

EFFECT: expansion of technological resources.

2 cl, 4 dwg

 

The invention relates to the processing of metals by pressure, in particular the production of hollow parts with steps on the outer surface, and can be used in mechanical engineering in manufacturing products of the type "nut connecting" cold machine.

A known method of manufacturing proposedly rivets, which cut the rod billet gauge length and produce deformation in a few transitions with the formation of a head on one end of the rod and the hollow axial cavity on the other. When you do this consistently carry out the calibration with the extrusion basting, direct extrusion with obtaining hollow cavity at one end of the rod, the reduction in the matrix and the final design of the rivet head [1].

The disadvantage of this method is the inability to obtain a billet, wherein in the intermediate position after reduction (reduction) of the outer diameter, the diameters of the holes drilled along the length of the workpiece, remained the same. When decrease (reduction) of the outer diameter occurs and the reduction of the internal diameter of the hole, and the lack of the hole diameter remains the same. In addition, the formation of the head and reducing the outer diameter of the workpiece are carried out simultaneously at the fourth position in the cut is ltate which have large arching efforts on reducing insert, as well as large compressive efforts occur in the stripper, having relatively thin walls, which greatly reduces the resistance reducing insertion and extractor.

Known multi-unit cold-formed machine for making hollow articles with steps on the outer surface of the Spool, which includes four items and contains the plungers, the plungers, modular matrixes with inserts and installed in the buildings on the pads, and a stripper mounted for movement [1]. On this cold block, you can get a billet with a blind hole in the head of the product.

The disadvantages of this unit can be attributed to the fact that at the fourth position where the forming head and the preservation of the diameter of the extruded holes, there is no reliable restrict the movement of the workpiece relative to the sleeve, and if the effort of removing the workpiece will exceed the force of pressing of the items in the holder, the item while pulling a semi-product of the punch will move together with the sleeve and will not allow the latter to remove the semi-finished product with the details. In addition, on the block it is impossible to get a hole in the stepped rod is deeper than the height of a step of larger diameter, due to the lack of matrices mechanism to get and with Renate hole in the stepped rod billet during its deformation.

Technical problem on which the invention is directed, is the expansion of technological capabilities by manufacturing hollow parts with steps on the outer surface without changing the size of the inner diameter of the hole.

The means to achieve the technical result consists in the fact that the production of hollow parts with steps on the outer surface of the produce five transitions, which is the fourth position, in which the reduction of the outer diameter with the formation of steps and keeping internal diameter of the blind hole obtained on the third position.

Tool for implementing the method is a multi-block containing the body of punches on the pads, pushers, located in the holes in the pads can move, pullers mounted on the punch can move. Corps teams matrices consist of inserts and linings, inside which move the punches, turning on the pushers, located in the holes in the pads can move and cringed to the surface of the hole of the elastic elements. At the fourth position in the formation of a step on the outer surface of the workpiece with a pre-made at the previous position hole team who atrica is fixed with the reducing step is inserted in the extractor is installed in its extended position relative to reducing the level plug with flange rests in the initial position in the spring and plunger installed in the hole of the strip.

Figure 1 shows a General view of cold-formed tool;

figure 2 - sequence receipt of a stepped hollow parts;

figure 3 - matrix fourth position;

figure 4 shows the position of the workpiece, the plunger 15 and the punch 8 before deformation.

Cold tool is made in the form of multi-unit, in which case the plungers 1 on the pads 2 are installed in the slots of the RAM of the machine. Pushers 3 are located in the holes in the pads can move and interact with the pullers of the machine. The stripper 4 is mounted on the punch can move and interact with the pullers of the machine through the pushers.

Modular matrix from the second to the fourth position consist of 5 buildings, inserts 6 and linings 7, inside which move the plungers 8, rests on the pushers 9, located in the holes of the pads 10 can move and interact with the pullers of the machine and are drawn to the surface of the hole of the elastic elements 11. The lining 10 is installed in the slots of the bed.

One-third of the th position of the combined matrix is moveable, consists of inserts embedded in the brace 12, which is biased by the elastic element 13 relative to the lining 14. The punch 8 is set stationary in the hole puller 15 on the lining 14. The puller is connected to the ejector of the machine through the pushers 9 and 16.

On the fourth position of the combined matrix is fixed with the reducing step 17 on the insert. The stripper 15 is mounted for movement and interaction with the ejector of the machine through the plungers 16 to stop its flange on the spacer 18. The punch 8 is placed in the hole puller with emphasis on the plunger 19, which is mounted in the bore of the gasket 20. In addition, the flange 21 of the punch 8 interacts with a spring 22 mounted in the housing bore of the gasket 20.

Cold tool works as follows.

Cut off the workpiece 23 is transmitted sequentially from the first position to the fifth transfer mechanism (not shown), and shank length 5 and removal of the workpiece from the punch 1 and 8 is carried out by the pushers 3, 9 and 16, the rods 4 and 5.

The first position is sediment - calibration cut the workpiece 23 in the cavity of the insert 6 team matrix between the punch 1 and the punch 8, based on the pusher 9, the alignment of the end faces of the workpiece 23 and the formation of conical outline on its two sides.

The second position is Dalneye the sediment of the workpiece 23 in the cavity of the insert 6 team matrix with the formation of the head between the punch 1 and the punch 8, based on the pusher 9.

The third position is extruded hole in the workpiece 23 between the wall of the insert 6 team matrix is moveable by means of a spring-loaded brace 12, and a stationary plunger 8, is installed on the lining 14, and eat with a punch carried by the puller 15 through ejector machine via the pushers 16 and 9.

The fourth position is the reduction of the outer diameter of the workpiece 23 with the formation of steps. The workpiece 23, moving under the action of the punch 1, abuts against the end face of the stripper 15, which supports the mirror matrix, and then when moving with the stripper 15 comes to bogatogo spring 22 of the punch 8, the end of which is above the reducing step of the matrix and with continued movement of the workpiece comes into her hole. The punch 8 when it is retained by the spring 22 and remains motionless.

Displacement of the walls of the hole of the workpiece 23 relative to the punch 8 is not that favorably affect its durability. Upon further advancement of the workpiece 23 its end communicates with the reducing step 17 insert 6 installed in a team matrix is stationary, there is a reduction of the outer diameter and forming steps. When the movement of the punch 1 to the initial position, the ejector machine affects tolgate and 16, which move the puller 15 together with the workpiece 23 and the punch 8 to the left. The spring expands, the punch 8 is moved until it stops its flange 21 in the spacer 18, further pushers 16 and 9, the stripper 15 continue to move together until the stop flange 21 of the stripper 15 in the spacer 18. The front end of the stripper 15 is beyond the mirror matrix 0.5 mm, and the workpiece 23 is ejected from the insert 6 team matrix and is captured by the transfer mechanism(not shown). Simultaneously with the pushers 15 and 9 moves the plunger 19 is fully inserted in the butt end of the punch 8. Now the housing 5 of the national a matrix the fourth position ready to receive the next workpiece while the end of the punch 8 is above the reducing step 15 insert 6 team matrix held in this position by the spring 22 and the plunger 19.

In fifth position is the firmware holes in the workpiece 23.

We offer cold tool allows you to get part having a step on the outer surface with a hole, deeper than the height of a step of larger diameter.

Sources of information

1. "Cold forging", Reference book edited by Navrotsky GA, Moscow, Mashinostroenie, 1973, s, 13(6); s-293, 17.

1. A method of manufacturing hollow parts with steps on the outer surface that includes education on the harvesting head, vidavlivanie is in the workpiece hole, the reduction of the outer diameter of the workpiece with the formation steps, the firmware holes, characterized in that the implement draft-calibration of cut workpiece alignment ends and the formation of conical outline on both sides, the education of the head is carried out by further precipitation of the workpiece, and the reduction of the outer diameter of the workpiece with the formation step is carried out in a fixed matrix having an insert with the reducing step, by moving the workpiece to another end in the puller placed in its hole spring-loaded punch, placing the specified punch extruded in the hole of the workpiece and further movement of the workpiece together with the punch and the stripper through the reducing step of the matrix.

2. Cold tool for manufacturing hollow parts with steps on the outer surface, made in the form of multi-unit, wherein the power unit includes five items and contains the plungers, the plungers, modular matrixes with inserts and installed in the buildings on the pads and mounted for movement pullers, with a fourth place team matrix is fixed and is made with the reducing step is inserted, a stripper fourth position is made with a hole, inwhich placed punch, spring-loaded by a spring to ensure the location of its end when receiving a workpiece above the reducing step of the matrix.



 

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