SU1242280A1 - Method of separating sheet material - Google Patents

Description

2. The method according to claim 1, wherein the recess is made with a diameter of a larger base that exceeds the diameter of the hole by an amount of 0.05-0.2

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The invention of fathers to the processing of sheet material by pressure and can be used to obtain sheet products with openings having rounded edges.

The purpose of the invention is to reduce the labor intensity of producing articles with openings having rounded edges, by obtaining roundings in the process of forming an opening. .

Fig. 1 shows a workpiece and a tool for forming a hole in the process of forming a recess; Fig. 2 shows the workpiece after a recess and a rod have been formed therein; in FIG. 3, the workpiece after the hole has been made therein.

The method is carried out as follows.

The blank 1 of sheet material is clamped between the matrix 2 and the clamp 3 in the area enclosing the surface on which the separation is to be made. Then, a punch 4 is inserted into the workpiece 1 from the side of the presser 3 and at the same time a recess 5 is formed on one side and a rod 6 on the other. After inserting the punch 4 into the workpiece material to a depth of 0-0-0-0 of the thickness of the workpiece material the end of the formed rod, using the punch 7, acts in the direction opposite to the direction of the efforts to form the recess 5, and moving the punch 7, and with it the material of the rod 6, by an amount of 1.35-1.75 thickness of the workpiece 1, separation of matterto the given dia pa .otversti, and a depth equal to the material thickness of 0.6-0.9, and the waste is moved in the separation of an amount equal to the material thickness 1,35- 1,75.

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five

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la billet and waste 8 and get a hole with rounded edges. The recess 5 is formed with a cylindrical section and a section having the shape of a slanted-cone tapering in the opposite direction to the formation of the recess 5. The diameter of the recess is made greater than a predetermined hole diameter by 0.5-0.2 times the diameter of the hole being punched; at the top of the surface of the conical section, 60-120 are performed, for which the punch 4 is made with a diameter of + Z, where D is the predetermined diameter of the hole in the product, Z is 0.05-0.2 values D. The diameter of the punch 7 and the working answer €. matrix 2 performed m equals a predetermined aperture diameter D in the product. The working ends of the punches 4 and 7 are in the form of truncated cones with a height of 0.25-0.35 of the thickness of the workpiece.

The method was tested when producing holes with a diameter of 16 mm in rims x wheels W 8-16 with a thickness of the product material of 4.5 mm and on rims x wheels 5.5 F 20 with a thickness of 3.8 mm made of steel 0, 8KP and also

making holes in products made of steel 20U and 45. Getting holes have a taper and a difference in the diameters of the ends that are within the gaps between the die and the punch during normal punching.

The complexity of producing articles with openings having rounded edges is reduced as a result of using the method proposed.

FIG. g

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Editor A. Sabo

Compiled by Y.Tseitlin

Tehred M.Ho.danych Proofreader L.Pilipenko

Order 3647/14 Circulation 783 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. d. 4/5 ..

Production and printing company, Uzhgorod, Projecto st., 4

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Claims (2)

1. A METHOD FOR SEPARATING SHEET MATERIAL with the formation ^of rounded sections at the intersection of the separation surfaces and the end ones, in which, prior to separation of the material, it is clamped on a section encircling the separation surface, a recess is formed on one side of the material, part of which is bounded by a truncated cone surface tapering in the direction of the opposite side and having a large base with a diameter larger than the diameter of the separation surface, o t · characterized in that, in order to reduce the complexity of the floor products with holes with rounded edges, the conical part of the recess is formed in the zone of location of the obtained hole and this part is performed with an angle at the apex of 60-120 °, simultaneously with the formation of the recess on the opposite side of the material, a rod is formed with a diameter equal to the specified diameter of the hole, and separation is carried out by applying to the core of the efforts directed towards the recess. $ ut.f SU ,,,, 1242280 2. The method according to claim 1, characterized in that the recess is performed with a diameter of a larger base exceeding the diameter of the hole by an amount of 0.05-0.2 of a given diameter of the hole, and a depth of 0.6-0, 9 of the thickness of the material, and the waste during separation is moved by an amount equal to 1.351.75 of the thickness of the material.