RU2510801C1 - Hydraulic press - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy and cab be used at 650 MN hydraulic presses. Hydraulic press comprises bed frame composed of C-like plate cramps. Every cramp is composed by top and bottom semi-cramps rigidly interconnected to make the bed load-bearing strut. Plates are arranged between plates semi-cramps to close the joints there between. Cylindrical rolls are used for rigid attachment of semi-cramp with plates. Oval bores to receive spacers are made in abutting parts of semi-cramps and plates. Said elements are composed of split wedge rolls composed by two parts. Every plate in stack is arranged with shift of the axis of their oval bores relative to those of abutting parts of semi-cramps. One of split wedge roll parts abuts on plates by its cylindrical surface. Another part of said roll is coupled with abutting part of semi-cramp.

EFFECT: higher reliability of joints between semi-cramps.

3 dwg

Description

The invention relates to metallurgical engineering, and in particular to the construction of powerful hydraulic presses with an force above 650 MN.

Known hydraulic press containing a frame bed of plate C-shaped staples, fastened in the upper and lower parts by couplers forming bolts (AF Belov, BV Rozanov, VP Linz "Die forging on hydraulic presses," M.: “Mechanical Engineering.” 1986, p. 44-45, fig. 23 and p. 56, fig. 29).

When creating more powerful presses, the manufacture, transportation and installation of C-shaped plate staples presents considerable difficulty. Therefore, it was proposed to make the bracket of the team of two half-brackets with the mating part of the hammer-shaped form, covered by two C-shaped plates, tightened by power ties and spacer wedge pairs (RF patent No. 2443561 adopted as a prototype, priority 06.09.2010).

The disadvantage of this design is the large dimensions of the mating part and, as a consequence, the increase in dimensions and weight of the entire frame. In addition, during the operation of the press, it is necessary to constantly ensure that the joined parts of the brackets remain as tight as possible, and the joints themselves are not opened.

The technical result of the invention is to create a press with smaller dimensions by reducing the dimensions of the abutting part of the half-arms, as well as increasing the reliability of the connection of abutting parts by creating a preliminary tension in them, which prevents the opening of the joint.

The technical result is achieved in that in a hydraulic press containing a frame bed in the form of C-shaped brackets, made in the form of two rigidly interconnected with the formation of the power rack frame of the bed frame half-struts and bursting elements, the mating parts of the upper and lower half-brackets include plates located between half-cradle plates and closing half-cradle joints, and cylindrical rollers that rigidly fix the mating parts of the half-cramps with the plates, forming a package, while in the mating parts of the half-cams and plates There are oval openings for installing the bursting elements, the bursting elements are made in the form of two-part split wedge rollers, each of the plates in the package is installed with the axis of its oval hole offset relative to the axis of the oval holes of the half-joined parts, and one of the parts of the split wedge a cylindrical surface with plates, and the other with joined parts of the half-bar.

The invention is illustrated by graphic materials, where:

figure 1 - General view of the press;

figure 2 is a view of the connection in the plane of the brackets;

figure 3 is a section along aa in figure 2.

The hydraulic press comprises a frame bed 1, including a left bracket 2 and a right bracket 3, each of which consists of a set of plate brackets. The left bracket 2 and the right bracket 3 are interconnected by power ties 4. The bracket 2 and the bracket 3 consist of two half-brackets - the upper and lower, respectively, 5 and 7, 6 and 8. The joints of the half-brackets 5 and 7, 6 and 8 are closed and connected by means of the plates 9. The plates 9 are installed between the plates of the joined parts of the half-brackets 5 and 7, 6 and 8, and also the joints are closed, as a result of which packets 10 are formed.

Then set the cylindrical rollers 11 and two-part split wedge rollers 12. For a strong connection of the packages 10, the cylindrical rollers 11 are installed in the corresponding holes with interference and tightened with nuts 13.

To install split wedge rollers 12 in the abutting parts of half-brackets 5 and 7, 6 and 8 and plates 9, oval holes 14 are made.

The preload force is created as follows.

The bed is assembled and the power couplers are tightened 4. Packages 10 are pre-assembled, alternating half-plate plates 5 and 7, 6 and 8 and plate 9 and installing plates 9 between the plates of the half-joint parts being joined (as well as closing the joints) with an offset of the axis of the oval hole 14 relative to the axis the oval holes 14 of the abutting parts of the half-arm, after which the cylindrical rollers 11 are pressed into the corresponding holes and the nuts 13 are tightened. The split wedge rollers 12 are installed in the oval holes 14 so that one part of the roller 12 (not movable) in its cylindrical surface is in contact with the joined parts of the half-brackets 5 and 7, 6 and 8, and the other part of the roller 12 (movable) is in contact with the plates 9. Due to the fact that the axis of the oval holes of the plates is offset relative to the axis of the joined parts of the half-brackets between the parts of the split wedges rollers 12, half-brackets and plates from the side opposite the contact, a gap is formed.

After mounting the bed, it is necessary to load the press with a force exceeding the working one by 20–25% in order to create pre-tensioning sections of the half-strut parts to be joined in the assembly design, which is done by pre-tightening the joined parts of the half-braces. The force from the upper 5, 6 and lower 7, 8 half-arms through the cylindrical rollers 11 is transmitted to the plates 9, which are stretched in the area between the cylindrical rollers 11. The internal parts of the half-braces in this section, due to the existing gaps, freely move in the direction of tension. At the contact areas of the parts of the split wedge roller 12 with half-brackets and plates, gaps appear, and the preliminary tightening disappears. Under the action of the load, the moving parts of the rollers 12 move, completely choosing the gap between their cylindrical part and the plates 9, after which the press is unloaded.

In half-brackets 5 and 7, 6 and 8 and plates 9 in the areas between the cylindrical rollers 11 and the split wedge rollers 12, a pre-tensioning force arises. Residual tensile stresses appear in the plates, and compressive ones appear in the joined parts of the half-bar. The amplitude of the alternating stresses from the working load in the concentration zones located near the holes in the plates 9 and the abutting parts of the half-brackets 5 and 7, 6 and 8 decreases, thereby increasing the fatigue strength of the entire joint - package 10.

Press works as follows. After loading the workpiece into the tool zone (upper and lower dies), the working pressure is supplied to the hydraulic cylinders of the press. The upper stamp acts on the workpiece, after which it is deformed and the design of the product. The stamping force is transmitted to the bed 1 of the press. The presence of pre-tension sections in the connection of the mating parts of the half-brackets 5 and 7, 6 and 8 and the plates 9, which make up the package 10 of the bed 1, ensures the operation of the press without opening the connecting junction.

Claims (1)

A hydraulic press containing a frame bed in the form of C-shaped plate brackets, each of which is made in the form of upper and lower half-brackets, rigidly interconnected to form a power rack of the frame bed, and bursting elements, characterized in that it is equipped with plates for mating parts the upper and lower half-brackets, which are placed between the half-brace plates and close the joints of the half-brackets, and cylindrical rollers that provide rigid fastening of the joined parts of the half-brackets with the plates with the formation of the package, this, in the joined parts of the half-brackets and plates, oval holes are made for installing the bursting elements, which are made in the form of split wedge rollers, consisting of two parts, each of the plates in the package is installed with an offset of the axis of its oval holes relative to the axis of the corresponding oval holes of the joined parts of the half-braces moreover, one of the parts of the split wedge roller is conjugated by its cylindrical surface with the plates, and the other with the joined part of the half-bracket.

Images