RU1784347C - Method of thickening marginal section of sheet blank and die therefor - Google Patents

Abstract

Usage: in aircraft construction, shipbuilding industry and other fields of engineering. It allows you to increase productivity, reduce equipment and production costs and expand technological

Description

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opportunities by obtaining high thickenings of various shapes. The essence of the invention: the deformation of the edge section of the sheet blank is carried out discretely over the same width sections in one working cycle, starting with a gradual bending, ending with a gradual bending and alternating it with a discrete movement of the workpiece one step apart from the wider section of the deformation, during crimping K5t s end upsetting into the bent end face of the billet in a die gradually varying to a predetermined gap. The stamp for implementing the method contains the upper 1 and lower 2 plates, as well as a punch, which, together with the pusher 4 and the clamp 5 is fixed to

The invention relates to the processing of metals by pressure, namely, the manufacture of sheets with thickenings, and can be used to thicken the edges of sheet blanks and parts.

The aim of the invention is to increase productivity, reduce the cost of equipment and floor space and expand technological capabilities by obtaining high thickenings of various shapes,

In FIG. Figure 1 shows the sequence of thickening of the edge portion of the sheet stock: a, b, c, d - bending; d, e - crimp; w, s, and

-distribution; in FIG. 2 is a diagram of a crimping process of a curved edge portion: a - fixing the workpiece along the pusher after moving it one step; b - the beginning of crimping; at

- end crimping; in FIG. 3 is a plan view of the lower part of the stamp; in FIG. 4 is a bottom view of the upper part of the stamp; in FIG. 5 is a section AA in FIG. 3; in Fig.6 is a section bB in Fig.5, crimp part; in FIG. 7-section BB in Fig. 5. Spread portion; on Fig 8 - section GG in Fig.6, a movable pusher,

The method is carried out as follows. Based on the Required thickness and the shape of the edge portion, the shape and dimensions of the die die, as well as the shape and dimensions of the punch, are calculated. The dimensions of the crimp zone of the die die (D, d, In) are determined from the prototype, based on the required height of the thickened edge h and its initial height ho. The dimensions and shape of the crimp zone of the punch are determined depending on the thickness and configuration of the thickening (clearance between the punch

the upper plate, and the pusher and the clamp are installed on opposite sides of the punch and with the possibility of relative axial displacement relative to it. The clamp 5 and the pusher 4 are spring-loaded with springs 6 and 7, while the clamp is placed along the three parts of the punch, and the pusher is opposite the crimp part of the die matrix, while the pusher has a protrusion 8. On the bottom plate with screws 9, the matrix 10 is fixed with a variable die cross section 11, wherein the punch and die are made with equidistant working surfaces and are divided into bending, crimping and straightening parts. The die matrix is equipped with adjustable stops and heating elements. 2 sec P. f-ly, 8 ill.

and matrix). The bending part of the die provides a gradual bending of the edge portion along the length of And from R to R y, and

j

a straightening bend cr & to the desired length u. The deformation of the edge section of the sheet billet is carried out discretely over the same width in sections over one working cycle, starting with a gradual bending, ending with a gradual expansion and a series of it with discrete movement of the workpiece by a step equal to the width of the deformation section, while

crimping is carried out with end upsetting into a bent end face of the workpiece in a gradually changing to a predetermined die gap. The direction of movement of the workpiece in the die is constant

the starting height ho and the output height h and is provided by stops 12 and 13. The number of crimps depends on the size of the die (D. d, In, y) and the feed rate of the workpiece per step. The amount of crimping is indicated by A h and

defined as the difference in edge height in any section of the crimp portion of the die before and after crimping The total crimping value is defined as the sum of the crimping per step. t e

P,

Dp U. Dp | Dgts + D P2 + DPS + .... + DNP 1 1

and is equal to the height difference before and after the deformation of DNh ho - h. The shape of the ml of the die is determined by the final shape and size of the edge portion.

With the steady-state process of thickening of the edge portion of the step size D1

are equal, i.e., D h D 1c D 1sc and are determined by the value of D1c.

The stamp for implementing the method comprises the upper 1 and lower 2 plates, as well as the punch 3, which, together with the pusher 4 and the clamp 5, is mounted on the upper plate, the pusher and the clamp mounted on opposite sides of the punch with the possibility of relative axial displacement relative to it. The clamp 5 is spring-loaded by springs 6 and installed along the entire length of the punch 5. The pusher 4 is provided with springs 7. has a protrusion 8 from the outside and is installed opposite the crimp part of the die plate with the possibility of entering it. A matrix 10 with a die 11 of variable cross section is fixed on the bottom plate with screws 9. The shape and dimensions of the working zone of the punch are equidistant to the inner surface of the die 11, while the punch and die die are divided into 3 independent parts: bending - I, crimping - II, distribution flush - III

The matrix is equipped with adjustable stops 12 and 13, installed respectively in the inlet part of the bending and output parts of the punch expansion elements. The heaters 14 are installed in the matrix. The bending, crimping and spreading parts of the punch are attached to the top plate with screws 15, clamp 5 and the pusher 4 with screws 16 and 17, respectively, The lateral movement of the clamp 5 and the push 4 is limited by the guides 18 and 19. The shape and dimensions of the working zones of the constituent parts of the punch and die are determined by the dimensions of the thickenings obtained: height, thickness and their configuration tion

To calculate the shape of the crimp zone of the die matrix 11, the data from the prototype is used, and the shape and dimensions of the crimp zone of the punch are determined depending on the thickness and configuration of the bulge. - extension of the thickened section to a given curvature

The stamp works as follows. The stamp is mounted either on the crank or on the hydraulic press, with its lower plate attached to the press table, and the upper to the movable traverse. The matrix is heated to a predetermined temperature with the help of heating elements 14. The side stops 12 and 13 are set to the values of h and ho according to the required height of the thickened section. Sheet cooking on an emphasis

5 10 15 20

25 30 35

40 45

50 55

12 is applied to the bending part of the die in Ali step.

The upper die is lowered, the clamp 5 presses the sheet blank to the plane of the matrix, whereupon the edge section is bent by the punch along the matrix. After that, the upper part of the die rises, the clamp 5 releases the workpiece, and together with the curved edge it is advanced forward to the next step.

Bending is carried out until the curved edge reaches the crimp part and the radius of the semi-cylindrical part

will not be equal to R. Crimped curved

section is carried out by moving the workpiece to step D | q, the value of which is determined by the amount of compression D hi and is regulated by the pusher. Crimp occurred; The procedure is as follows: the workpiece is fed to the protrusion 8 of the pusher 4, the upper part of the die is lowered and the clamp fixes the workpiece, and the edge section, by pressing the pusher 4 on its end, abuts the crimping die. The pushrod travel is provided by spring 7. With further lowering of the pushrod 4 together with the punch 3, the edge section is crimped, i.e., it is shortened in the tangential direction, in contact with the matrix with its entire outer surface; the thickness of the edge portion increases and is determined by the shape and size of the working part of the crimp punch. Then, the upper part of the die is lifted, the sheet blank is released and moved one step, and the process is repeated. After complete calcination, up to g, the marginal portion moves

into the extensible part of the stamp, where with a step Д | щ Л 1ц, it extends to the required radius.

In the process of thickening the edge section of the sheet, the workpiece can be fed manually, mounted on a support device or moved in a semi-automatic mode in accordance with the progress of the press slide.

EXAMPLE A method and a stamp for its implementation have been tested upon obtaining thickenings at the edge portion of a 300 x 300 x 2 mm sheet blank of AMgbM aluminum alloy. A die with a variable die was prepared to produce a bulge with a height of h 52 mm. The initial edge height for thickening was ho 78 mm. The parameters of the die matrix: D 50 mm, d 33 mm, 1c 63 mm, ymakc 15 °. Bending, crimping and extension were carried out on an Olsen hydraulic testing machine with a constant pitch L I 10 mm. The lengths of the bending, crimping and bending parts of the stamp are made equal. The punch along the entire length of the HQ is made equidistant on the die matrix. The workpiece was supplied manually. The matrix was heated to a temperature of 400-420 ° C. The maximum force of forming during the move of the movable part of the stamp (including bending, crimping and extension) was approximately 11.0 kN. As a result, thickenings were obtained with the parameters: h 54 mm, S 3.4-3.0 mm with a radius r of 300 ° C. mm Moreover, the thickness of the edge portion along the height was constantly with some decrease towards the end face, which is explained by the flattening of the end face when it is unbent in the stamp.

The use of the proposed method and the die for its implementation will increase productivity by combining operations, reduce the cost of manufacturing parts with bulges by reducing the cost of equipment and floor space, and expand the technological capabilities of the process by obtaining high thickenings of various shapes.

Claims (2)

1. A method of thickening the edge portion of a sheet blank by deformation by bending, crimping a die with a variable compression ratio in a die and subsequent straightening, characterized in that, in order to increase productivity, reduce equipment and production costs and expand technological capabilities by obtaining high thickenings of various shapes, deformation is carried out discreetly over the same width sections in one working cycle, starting with a gradual bending, ending gradually nym a flattened and its string of discrete workpiece transfer step equal width portion deform, with the crimping is carried out with the end face curved in a draft preform to progressively varying gap to a predetermined die. 2. A stamp for thickening the edge of the sheet blank containing a die with a variable die and a clamp, characterized in that, in order to increase productivity, reduce equipment and production costs and expand technological capabilities by obtaining high thickenings of various shapes, it is provided with a top movable plate, with punch and pusher, die and punch made of bending, crimping and spreading parts with equidistant working surfaces, pusher and clamp mounted on opposite sides of the punch with the possibility of relative axial displacement relative to it, with the clamp placed along the three parts of the punch, and the pusher opposite the crimp part of the die matrix and with the possibility of entering it. FIG. i about ABOUT YU d. CM Ј Njoi Ј   V FIG. 7 Yy / 7. Compiled by S. Zharkov Editor. Tehred M. Morgenthal Corrector S. Pekar Order 4334Tira Subscription VNIIIPI of the State Committee for Inventions and Discover at the USSR State Committee for Science and Technology 113035, Moscow, Zh-35, Rauska nab., 4/5