SU897377A1 - Die for volumetric forming of finned articles - Google Patents

Description

I

The invention relates to the processing of metals by pressure, in particular to dies for the bulk forming of articles with ribs.

A stamp is known for the volumetric stamping of articles with ribs, containing the upper and lower halves with preliminary and final strands with cavities made in each of them to form ribs and intercostal spaces of the joint venture.

A disadvantage of the known stamp is the low quality of the finished product.

The aim of the invention is to improve the quality of the finished product.

This goal is achieved by the fact that a die for stamping products with ribs containing upper and lower halves with preliminary and final brooks with cavities for forming ribs and intercostal areas in each of them is provided with bridges, each of which is made in the final brook ; between the cavity to form the ribs and the cavity to form the intercostal area, the bridge height being determined by the dependence

.. VitP -Shock

 21. Wt where H is the height of the bridge;

-volume of the metal of the strain stravnp element in the preliminary line

10 whose;

-voltage metal zlemeita strain of pokov in the final stream;

L is the perimeter of the element and punching along the connector line;

15

W is the rate of metal outflow into the cavity to form the intercostal space;

t is the expiration time of the metallav cavity to form

20 ribs;

2 - coefficient taking into account the outflow of metal in two directions; 389, the width of the bridge B () I, while the volume of the cavity for forming the pre-stream rib is 1.15-1.2 times the volume of the cavity for forming the edge of the final stream, and the cavity for forming the intercostal area of the preliminary stream is smaller than the cavity for forming the intercostal area of the final the brook is 3.5-5 times, and the depth of each core for forming the intercostal space is (0.1-0.2) the height of the edge of the resulting products. FIG. i schematically depicts the proposed stamp for bulk stamping of products with ribs along a preliminary stream, a section; in fig. 2 bottom half stamp, top view; in fig. 3 - the second half of the stamp; in fig. 4 - stamp on the final stream, cut; in fig. 5 — node I on FIG. four.

The die for stamping products with ribs contains lower} and; top 2 halves. On each of the punch halves, a preliminary stream is made, consisting of a cavity 3-for forming ribs, intercostal areas 4 and a layer groove 5, a final finisher, also consisting of a cavity 6 for forming edges, intercostal areas 7 and a layer grooves 8.

In the case of stamping products with large ribs, preliminary and final streams can be performed on separate cubes. In the preliminary stream, each cavity 3 for forming ribs smoothly passes into the cavity for form 1 of the intercostal space 4. At the same time, each cavity 3 is made of volume c. I, times exceeding; the volume of a similar cavity 6 of the final stream. The indicated range of volume excess is chosen because this excess metal formed in the preliminary stream is necessary for compressing the metal during stamping in the final stream as well as for providing the necessary critical degree of deformation allowing to obtain stamping with a high-quality macrostructure without a coarsely crystalline rim. Each cavity for forming the intercostal area 4 of the pre-stream is made of a depth equal to h (0.1-0.2)

in the cavity 3 of the preliminary brook, in the cavity to form meg (the scraper sections 7 of the final brook,

and also the movement of the metal in case of possible under-stamping in the preliminary stream, and as a result, it allows to obtain stampings with exact vertical dimensions, necessary mechanical properties and a good macrostructure.

When the depth of the cavity, the formation of the intercostal space 4 is less than 0.1 of the height of the corresponding rib element of the resulting product to form will require a greater force of the forging equipment. When the depth exceeds 0.2 the height of the rib element of the resulting product, irrational movement of the metal of the workpiece in the cavity will take place to form the intercostal area.

This is also explained by Tei ;, the distribution of the metal being stamped should occur in the pre-stream, allowing it to move out of the cavity to form the intercostal areas in the quality filling of cavities to form ribs in the final stream. The final stamp stream is supplemented with bridges 9, each of which is placed between cavity 6 to form an edge and a cavity to form intercostal areas 7. Each of bridges 9 is made with a height determined by the formula

Vnp -vok

AND

t

2UWt

where U „p is the volume of the metal of the stamping element in the preliminary stream; 4 corresponding element of the edges of the resulting products. This is due to the fact that in the pre-distribution there is a distribution of the metal being stamped, which ensures its movement from the cavity to form the intercostal space into the cavity to form the fins and leads to saving of the metal and high-quality formation of the fins. The volume of each cavity to form the intercostal area 7 of the final stream is 3.5–5.0 times the volume of a similar cavity of the preliminary stream. Such an increase in volumes ensures the movement of excess metal, laid

Vg is the volume of the metal of the stamping element in the final stream; L - perimeter of the stamping element

on the connector line; W is the rate of metal outflow into the intercostal space; t is the expiration of the metal in the intercostal space; 2 - coefficient taking into account the outflow of metal in two directions; the width of the bridge is equal to B (4-5) H,

Such a length of bridges 9 provides resistance to the outflow of metal, which is necessary both for the quality design of the ribs and their thickenings, and for the movement of excess metal embedded in the cavities of the 3. preliminary stream. When the bridge width is 4 N, the resistance to the outflow of metal in the cavity decreases to form the intercostal space and the bridge will not perform its braking function, providing the compression of the metal necessary for high-quality design of the ribs. When the value of width is 7 5 N, the resistance to the outflow of metal increases and each of the bridges will prevent the release of excess metal embedded in the cavity of the precursor. a brook into the cavity to form the intercostal space, which, while ensuring the nominal dimensions of the product, will result in an increase in the equipment force or in possible under-stamping, i.e. an increase in the height of the product. The stamp works as follows. It is installed on the forging equipment: press or hammer. The billet is heated in a heating device to the desired punching temperature and placed in a preliminary stream. Then, the lower 1 and the vertical 2 of the half of the stamp are brought together by a punching force developed by the forging equipment and the workpiece is deformed, as a result of which the metal is compressed and the preliminary broach of the stamp is filled. After this, the prefixing is removed from the precut punch and transferred to a heating device, in which it is heated to the required temperature. The heated pre-stamping is placed in the final stream of the stamp 5 in which the final form of the stamp is obtained. Thereafter, the stamped product is removed from the stamp and sent to subsequent operations of the process.

In the proposed stamp with the same

success can be made of stamping of the type of frameworks with fins inside the stamping contour with different configuration (arrangement of edges or ribs alternating with thickenings or

other forms due to the design of the finished product).

Claims (1)

The mutual arrangement of the ribs can have various geometric shapes of a square, trapezium, rectangle. or a triangle — rectangular, isosceles, multi-sided or with different sides, or a rhombic shape formed by different curves of the second order. The ribs with respect to the plane of the connector of the dies can be of different sizes (symmetric, of different height, with different widths, both in one and in the other half of the stamp, inclined or with varying heights along their length). Aluminum magnesium alloys, as well as structural steels and iron-based alloys can serve as the material listed for the products. The proposed die is simple in design and in manufacture, characterized by high durability. It allows to obtain high quality products with fully decorated ribs and their thickenings. With equal areas of the stamping projection onto the plane of the connector, the proposed 1st stamp, provided with internal bridges, requires considerably less effort from the forging equipment than when stamped with a stamp, which lacks such bridges. Claim for stamping products with ribs containing upper and lower halves with preliminary and O1 straps with cavities made in each of them to form ribs and intercostal areas, characterized in that in order to improve the quality of the products obtained, it is equipped bridges, each of which is made in the final stream between the cavity for forming ribs and the cavity for forming the intercostal space, and the height of the bridge is determined with dependence .. Vn i-VoK where H Vnp is the height bridge; -volume metal element stamping in the preliminary stream; - the volume of the metal of the heading element in the final stream - the perimeter of the stamping element along the line of the connector; rate of metal outflow into the cavity; dL of formation of the intercostal area: time of metal outflow into the cavity to form ribs; 2 - coefficient taking into account the discharge of metal in two directions x The width of the bridge B (4-5) N, while the volume of the cavity for forming the edge of the preliminary stream is 1.15-1.2 times the volume of the cavity for forming the edge of the final stream, and the cavity for forming the intercostal area of the preliminary stream, there is 3.5–5 times smaller cavity of the formation of the intercostal area of the final stream, and the depth of each cavity for forming the intercostal area is (0.1–1.2) the height of the edge of the resulting products. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 137103, cl. B 21 K 23/00, 12.06.60 (prototype),