KR20100014060A - Four-die forging device - Google Patents

Abstract

The invention relates to metal forming and can be used for forging billets and blanks by means of forging presses and radial-swaging machines. Four dies are mounted on holders which are provided with inclined planes and antifriction plates arranged thereon. The holders of the top and lower dies are kinematically connected to the holders of the lateral dies. Centring guides are mounted on the inclined planes of the top and lower die holders or on the inclined planes of the lateral die holders. They are placed in centring grooves which are formed by the groove walls of the lateral die holders or the top and lower die holders and the side planes of respective antifriction plates. The device also comprises lateral separating guides provided with an F-shaped cross-section. The width of the working face of each die is equal to 0.5-0.9 the width of the supporting surface thereof. The ratio between the total contact area of the antifriction plates of the lateral die holders with the antifriction plates of the top and lower holders in the closed device (S) and the total area of the projection of the working faces of the lateral dies on the longitudinal symmetry plane (S) of the device is defined by the formula S/S>=2.5. Said invention makes it possible to extend the service life of the device.

Description

4 die type forging machine {Four-die forging device}

The present invention relates to the field of metal processing by compression, i.e. the use of a four die type forging machine, which can be used to forge molds and prefabricated products in hydraulic presses and peripheral presses.

The present invention relates to the production of products with extension shafts, for example jib sticks, supports, jackshafts, torsion shafts, rollers of rollers and similar products, and prefabricated forgings by pressing. In production, it is used in manufacturing and metallurgical equipment. For example, it may be forged from structural steel, stainless steel, heat resistant steel, deformation resistant steel and alloy steel.

A conventional four die type forging machine has two holders of side dies with panels having two holders of inclined top and bottom dies and inclined panels that are dynamically coupled to and aligned with the inclined panels of the upper and lower die holders. do.

The instrument is placed at an angle of 3 to 75 degrees with respect to the vertical panel of symmetry. These are four dies inserted in the corresponding die holders (Ukrainian Publication No. 29183A, B21J 13/02, 1998).

The instrument can be subjected to high quality forgings with a low forging reduction ratio. It also ensures forging of prefabrications within a wide range of cross sections.

The disadvantage of this forging machine is that it does not survive long maintenance periods without breakage and repair.

Another four die type forging machine is known. It has two further die holders with holders of the upper / lower die with the inclined panel, and an inclined panel fitted with the inclined panel of the upper and lower dies. In addition, there are lubricating plates installed on the inclined panels, eight side partition rails, and four dies having a working surface and a supporting surface. It also includes a system for supplying a lubricant to the friction coupling, which system is provided with a pump, transport tubes, flexible hose, coupling member and channels formed in the die holders (Ukraine Patent 67879). No., B 21 J 13/02, 3/00, 2004).

This design ensures an extended maintenance period of the device.

However, this known device cannot guarantee a long maintenance period that is not repaired due to the formation of edge fins in the machining surfaces of the lubricating plates.

The technical achievement in the present invention is the increase in the service life between repairs caused by a four die forging machine. This period increased due to the minimum level of probability that edge fins would form on the machined surface of the lubricating plates.

The technical achievements described above include a holder of an upper / lower die with a four-die forging having an inclined panel, and two holders of side dies on which the panel is inclined and joined with the inclined panel of the upper / lower die holders (first Dynamically engaging the dies of the engagement) and when the panels are installed on the inclined surfaces of the holders of the upper / lower and side dies. The instrument also includes a lubrication system for lubricating the lubricating plates, eight side guides, support surfaces, and frictional engagement. In addition, the at least one panel perpendicular to the longitudinal axis of the device includes arrangement guides installed on the inclined surface of the upper / lower die or the inclined surface of the side die holders. These guides are formed by the walls and inserted into the arrangement slots respectively formed inside the inclined surfaces of the holders of the upper / lower and side dies and next to the side panels of the lubricating plates. The side partition guides have an F-shaped cross section. The width of the processing surface of each die is 0.5 to 0.9 of the width of the contact surface. The total contact area (S ₁ ) of the lubricating plates installed on the inclined surfaces of the side die holders and the lubricating plates installed on the upper / lower die holders in the closed state, and the total surface area of the side dies protruding from the longitudinally symmetrical panel of the machine. (S ₂ ) is in the following ratio:

S ₁ / S ₂ ≥ 2.5

The setting work is solved through the configuration of the arrangement rails installed on the inclined surfaces of the holders of the upper / lower die of the panel. The array slots are formed by the walls of the slots formed inside the inclined surfaces of the side die holders and the side panels of the lubricating plates.

1 shows a four die forging machine in a stationary state;

2 is a cross-sectional view taken along line A-A in FIG. 1;

3 shows a variant of the A-A cross section of FIG. 1;

4 is a cross-sectional view taken along line B-B in FIG. 1;

5 shows a four die type forging machine with arrangement guides installed in holders of upper / lower dies;

6 is a cross-sectional view taken along line C-C of FIG. 5;

Figure 7 shows a four die forging machine in the prefabrication of the prefabricated (hatched cross section of the prefabrication represents the final moment of the compaction).

The four die type forging machine of the present invention will be described with reference to the drawings (FIGS. 1 to 7).

FIG. 1 shows a four die type forging machine in a stationary state, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 shows a variation of the cross section taken along the line AA of FIG. 1, and FIG. . FIG. 5 shows a four die type forging machine in which arrangement guides are installed in holders of upper and lower dies, and FIG. 6 is a cross-sectional view taken along line C-C of FIG. Figure 7 shows a four die forging machine in the prefabrication of the prefabricated (hatched cross section of the prefabrication represents the final moment of the compaction).

The four-die forging machine has a holder 1 of an upper die connected to the upper flexible plate 2, a holder 3 of a lower die connected to a lower fixing plate 4, two holders 5 and 6 of side dies, Four dies 7-10 inserted in the holder, eight division guides 11 supporting the kinematic link between the holders of the side dies and the upper / lower dies, the lubrication plate 12, and It consists of a system 13 for supplying lubricant to the friction engagement (see FIG. 1). The holders 5, 6 of the side dies are arranged by the arrangement guides 12 towards the holders 1, 3 of the upper and lower dies. One array guide 14 may be installed on each inclined surface of the die holders (see FIG. 2), or a plurality of array guides may be installed, for example two array guides 14 (see FIG. 3).

The arrangement guides 14 may be installed on the inclined surfaces of the side die holders 5, 6, or may be arranged on one or more panels perpendicular to the longitudinal axis of the forging machine. They can be inserted into the arrangement slots formed in the inclined surfaces of the holders 1, 3 of the upper / lower dies and formed on the sidewalls of the lubrication plates 12, and inserted into the walls of the slots (see FIGS. 1-3). .

The arrangement guides 15 may also be installed on the inclined surfaces of the holders 16, 17 of the upper / lower dies, formed by the sides of the lubricating plates 20 and by the side die holders 18, 19. Arrangement slots in the inclined plane of and the wall of these slots can be inserted (see FIG. 5).

The side partition guides 11 have an F-shaped cross section. They are securely fastened to the holders 1, 3 of the upper / lower die by means of stud bolts. There is a gap between these guides and the side die holders 5, 6 over the sliding surface (see FIG. 4). The dies 21-24 of the forging machine have the form (section) shown in FIG. 6. The width b ₁ of each processed surface is 0.5 to 0.9 of the width b ₂ of the contact surface. That is, the ratio b ₁ / b ₂ = 0.5 to 0.9 is maintained.

If b ₁ / b ₂ <0.5, the effective output of the forging is significantly reduced, and if b ₁ / b ₂ > 0.9, side-sway of the side die holders may occur and edge pins on the surface of the lubrication plate (edge fin) can be formed.

In addition, the following ratios are maintained in the design of four die forging:

S ₁ / S ₂ ≥ 2.5

Where S ₁ is the total contact area of the lubrication plate installed on the inclined surfaces of the side die holders in the closed forging machine and the lubrication plate installed on the holders of the upper and lower dies, and S ₂ is the panel of longitudinal symmetry (0-0) of the forging machine. Is the total area of the machined surface of the side starters projected on (see FIG. 1).

If the lubricating plates reach the value S ₁ / S ₂ ≥ 2.5 formed by the frictional coupling, rough edge pins may occur and repair is required.

The mounting of the four die forging machine on the compression table and the elevating beam is similar to the mounting of a conventional die.

The four die type forging machine operates according to the following pattern.

Before providing the prefabricated product 25 to the appliance, the operating space of the forging machine is opened to the size required for the elevator to rise. The mechanical arms (not shown) then press the prefabricated by the dies 7-10 while loading the prefabricated product 25 into the working space and unloading the compression beam (see FIG. 7). During compaction, pressure is transmitted to the holder 1 of the upper die through the elevator and plate 2, and then to the holders 5, 6 of the side dies as well as the stop holder 3 of the lower die. (See FIG. 7). Upon movement of the side die holders 5, 6, pressure is transmitted to the side dies 5, 6 via the inclined surface of the holders 1, 3 of the upper / lower die. When the machining surfaces of the dies 7-10 press the prefabricated body 25, the pressure at the sliding surface of the lubricating plates increases significantly. In addition, before each pressing cycle, a load imposition eccentricity always appears towards the vertical panel of machine symmetry since a prefabrication of any length is inserted from one of the sides of the forging machine. This eccentricity results from misplacement of the die holders with respect to each other. Due to the torsional, certain pressures in certain areas of the lubricating plates increase rapidly and this is due to the formation of edge fins at these surfaces. In the proposed design of the forging machine, the value of the load eccentricity tends to decrease because the width b ₁ of each machining surface is smaller than the width b ₂ of the contact surface (b ₁ / b ₂ = 0.5 to 0.9) (FIG. 5, 6). The reduction in torsion in the forging machine of the present invention is also ensured by arrangement guides installed on the inclined surface of some die holders and overlapping with the arrangement surfaces of the other die holders. By means of the alignment guides, the placement error of the die holders is significantly reduced. In order to minimize misplacement between the side die holders and the holders of the upper / lower dies, the side separation guides have an F-shaped cross section. This end face of the lateral partition guides forms a rigid dynamic bond with respect to the side die holders and the holders of the upper / lower dies, reducing the twist between the lubricating plates in the sliding engagement, and thus the edge pins are formed on them. Eliminate the possibility

In the forging machine of the present invention, the following ratio:

S ₁ / S ₂ ≥ 2.5

This is also maintained.

If this ratio is maintained, the specific pressure at the machining surfaces of the lubricating plates does not exceed the maximum allowable pressure that the edge pins can develop on these surfaces.

The proposed design of the four die forging machine guarantees the following results.

Friction sealing is removed where the friction surfaces collide;

The likelihood of edge fins appearing on impact surfaces is significantly reduced;

Due to the breakage of the frictional coupling, the probability of emergency stop of the forging process is significantly reduced.

Product tests of the four die type forging machine, one according to the proposed design and the other based on the basic type, proved an important advantage of the forging machine of the present invention. The four die forging machine forged 5-7 tons of mold from structural steel in a 20 MH hydraulic forging process. Before the initial repair of the lubricating plates, about 33,200 tonnes of casting were made in the basic form, and in the device of the present invention, 48,750 tonnes were 1.47 times more.

The present invention is designed for use in the field of pressure metalworking and can be used to forge molds and prefabricated products in hydraulic forging presses and peripheral presses.

Therefore, the design of the four die type forging machine of the present invention ensures a longer period of dry use.

Claims (2)

Holders of upper and lower dies having inclined surfaces; Two holders of side dies that dynamically engage the holders of the upper and lower dies and mate with the inclined panels of the holders of the upper and lower dies; Lubricating plates; Eight side separating guides having the upper, lower and side dies mounted on the inclined surfaces of the holders and having a processing and backing surface; A system for supplying lubricant to the friction bonds; And One or more panels perpendicular to the longitudinal axis and arraying guides installed on the inclined surfaces of the holders of the upper and lower dies, The guides are inserted into arrangement slots of walls inside the inclined surfaces of each of the side die holders or holders of the upper and lower dies and inside the side panels of the lubricating plates, Further comprising side segment guides having a width of the working surface of 0.5 to 0.9 of the width of the contact surface and having an F-shaped cross section, Overall contact area S ₁ of the lubricating plates installed on the holders of the upper and lower dies and the lubricating plates installed on the inclined surfaces of the side die holders in the closed state, and the machining surfaces of the side dies protruding from the panel of longitudinal symmetry. Their total area (S ₂ ) is below the ratio: S ₁ / S ₂ ≥ 2.5 The forging machine of the 4 die system characterized by the above-mentioned. The method of claim 1, The arraying guides are installed in the inclined panels of the holders of the upper and lower dies in the panel of cross symmetry, And the array slots are formed in the inclined panels of the side die holders and in the side panels of the lubrication plates.

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