Device for manufacturing hollow parts draught
(57) Abstract:Usage: metal forming, in particular the production of hollow parts with a profile on the part of the inner surface. The inventive device for the precipitation of hollow workpieces comprises upper and lower plates, the matrix, the punch, the frame and the ejector. Traverse lift ejector rods connected with the upper plate with the possibility of vertical movement within the mandrel. When the ejector and yoke rigidly interconnected and biased relative to the matrix, located on the crumbs that are installed on the bottom plate. The mandrel is made with a smooth bottom and profile top work areas. The upper section is placed the safety device workpiece having a profile corresponding to the profile of the mandrel. The bottom plate has a cross-shaped slot on the top plane under the yoke. While the depth of the groove corresponds to the thickness of the bar. 4 Il. The invention relates to the processing of metals by pressure, in particular the production of products draught, and can be used in the production of parts mainly to the profile of the internal cavity.A device for the manufacture of parts asadministrative spring-loaded terminals, before upsetting protruding above the mirror matrix, at the moment of precipitation buried in the nest, and after precipitation again rising above the mirror together with the item.However, in this solution for springs in the lower plate is executed release. This weakens the plate. By increasing its thickness increases the intensity of the device. When reducing the thickness of the plate it sags, the reduced tool life and part quality due to deflection.The closest in technical essence to the invention is a device for manufacturing hollow parts intended for precipitation hollow workpieces. This unit has a frame, which forms the inner surface of the part. The mandrel is performed stepwise: the bottom level with the bottom plate of the device form the lower working surface for precipitation. The mandrel is simultaneously the release of the original piece, and ejector parts of the matrix.However, there is a need for removal of parts from the mandrel, which increases the complexity and reduces performance. The disadvantages of the device include the presence of hydraulic ejection and removal, which limits the choice of presses narrows technological capabilities.The purpose of the invention is the expansion of technological capabilities, increase productivity and reduce the complexity, the removal of restrictions when choosing equipment.This is achieved by a device for manufacturing hollow parts draught, containing upper and lower plates, the matrix, the punch, the mandrel with the working surface and the ejector equipped with a traverse lift ejector made in the form of detachable cross members rigidly connected with the upper plate rods, ejector made ring rigidly mounted on the transverse concentric with the mandrel and the matrix in the annular cavity formed by their external and internal working surfaces and is spring-loaded relative to the matrix associated with the bottom plate of biscuits, a frame rigidly mounted on the bottom plate and located diametrically through the slots placed in them by the cross, the height of which exceeds the stroke of the bar, while the working surface of the mandrel performed sequentially located profile and smooth areas in the upper part of the mandrel is the safety ring blanks, the cross section of which corresponds to the cross-sectional profile section of the mandrel and the bottom plate of the IG. 3 is a General view of the device of Fig. 4 - the bottom of the unit plan.The device consists of an upper 1 and lower 2 plates, matrix 3, a plunger 4, the mandrel 5, the safety device 6, the ejector 7, the head plate 8, crackers rods 9 and 10. The punch 4 is fixed on the top plate 1. The mandrel 5 is installed in the bottom plate 2 and has two diametrically arranged slot, which has a yoke 8 with the possibility of vertical movement. The traverse is made in the form of a cross of two separate plates.When assembling, first put one of the plates, then the second and each of them is rigidly attached to the piston 7 by screws 11. The whole system of the ejector - spring-loaded yoke relative to the lower plane of the matrix 3 by means of springs 12. Matrix 3 is posted on the crackers 9 installed on the bottom plate between the plate beam-crossings, and through the crumbs attached to the bottom plate 2. The mandrel, the ejector and the matrix is set relative to each other concentrically. The mandrel has a smooth and a profile part.On the core side of the mandrel 5 is placed the safety device 6 having a profile corresponding to the profile of the mandrel, but is made smaller in size. Thrust 10 rigidly connected with the upper plate 1 by nuts 13, and at their, equal to the height of the bar, and openings for the passage of the rod 10 by screws 14. The device has a column guides 15 and sleeve 16.The device operates as follows. The workpiece 17 is installed with a fixation on the safety device 6. When the press slide down falls the upper part of the device. Thrust 10 move down and let go of the yoke 8. Under the action of the spring 12, the ejector 7 and the yoke 8, fastened by screws 11 are omitted. When the contact plug 4 with the workpiece she pushed with the annular gap between the matrix 3 and the parts of the mandrel 4. When the traverse 8 is buried in the groove of the bottom plate 2 and rests on the plate, the ejector 7 is based on the yoke 8 and the plate 2, starts the deformation of the workpiece draft. The outer diameter of the part is calibrated by 3 matrix, smooth inner diameter of the smooth portion of the mandrel 5, in the flow of metal in the hollow profile section of the mandrel 5 is made relevant portion of the part. Upon reaching the desired height details draught stops. When the movement of the press slide up under the action of the rod 10 yoke 8 with the ejector 7 moving upward, the spring 12 is compressed, stamped parts rises. When the ejector is returned to its original position, i.e., padnimae one of its surface and can be removed from the zone of the device. Again set the workpiece, the process repeats.The use of the invention allows to expand the technological capabilities by obtaining various forms of parts to increase the performance and reduce the complexity due to the rapid fixing of the workpiece before the draft stamp and opportunities after popping removal stamped parts, to expand the range of pressure equipment by combining the device functions deformation and ejection independent ejector system presses. (56) USSR Author's certificate N 1704896, CL 21 J 5/12, 1989. DEVICE FOR MANUFACTURING HOLLOW PARTS DRAUGHT, mainly with a profile on their inner surface, comprising upper and lower plates, the matrix, the punch, the mandrel with the working surface and the ejector, wherein it is provided with a head plate lifting ejector made in the form of detachable cross members rigidly connected with the upper plate rods, ejector made ring rigidly mounted on the transverse concentric with the mandrel and the matrix in the annular cavity formed by their external and internal working surfaces, and is spring-loaded relative to the matrix relating the mi through the slots placed in them by the cross, the height of which exceeds the stroke of the bar, while the working surface of the mandrel is formed of successive profile and smooth areas in the upper part of the mandrel is the safety ring blanks, the cross section of which corresponds to the cross-sectional profile section of the mandrel and the bottom plate is made grooves under the crossbar depth equal to the thickness of the bar.
FIELD: plastic working of metals, possibly manufacture of parts with shaped contour, for example polyhedral parts.
SUBSTANCE: method comprises steps of forming round cross section semi-finished product; embossing its surface for forming relief in the form of alternating protrusions and recesses and shaping curvilinear contour of said relief. Size of shaped contour corresponds to size of profile of ready part. Diameter of described circle passing through apexes of curvilinear protrusions is selected in range consisting of (1.15 - 1.35) of diameter of inscribed circle passing through apexes of recesses of part. Curvilinear contour of protrusions and recesses is shaped due to acting upon semi-finished product by means of shaping tool having profile of working surface in the form of curvilinear protrusions. The last have curvature radius with curvature centers spaced from part symmetry center by distance exceeding by 1.65-1.8 times distance from said symmetry center till curvature centers of curvilinear protrusions of part. Curvilinear recesses are alternated with curvilinear protrusions on working surface of shaping tool. Diameter of described circle passing through apexes of said recesses consists (1.15 - 1.35) of diameter of inscribed circle passing through apexes of curvilinear protrusions.
EFFECT: enlarged manufacturing possibilities of method and apparatus.
8 cl, 8 dwg
FIELD: plastic working of metal, possibly forming on inner surface of tubular blanks with bottom multi-stat helical riffles of mutually opposite directions at manufacturing fragmentation type envelope of ammunition.
SUBSTANCE: riffles form grid of rhombic protrusions. In order to form such riffles, tubular blank is reduced by two successive operations. At each operation tubular blank and punch with helical protrusions are together pulled through sizing die. Each operation is realized at least during two transitions while punches whose length is multiply less that length of blank are used. Common pulling through of blank and punch during first transition of each reduction operation is realized while punch rests upon bottom of blank. Between transitions at each reduction operation punch is unscrewed from blank with formed helical riffles for forming between punch and blank band of engagement of helical protrusions of punch and helical riffles of blank. Said band is used at next reduction transition for resting punch and for providing desired direction of formed helical riffles.
EFFECT: enlarged functional and manufacturing possibilities of method.
SUBSTANCE: hollow cylinder stock is brought with its not subject to treatment end to clamping device and fixed in it. After that a mandrel with a coaxially inserted and lengthwise set off spike is introduced into the end of the zone of the stock, subject to treatment. Its free end passes up to the clamping device. The end of the spike is brought after that in an axial direction of the stock into contact with geometric locking with the clamping device. The mandrel together with the clamping device and stock are axially passed through a stationary technological position. To facilitate inside and, if necessary, outside profiling, the surface of the stock along the section subject to treatment is radially effected in this position. The device contains the first and axially installed to it the secondary spindle straddles, axially set off to the first spindle straddle mandrel and the stationary technological position with cold fabrication tools for operating radially to the axis of the straddle. The clamping device is located coaxially against the axis of the first straddle and it is designed to be set off against the technological position. At that the technological position is situated stationary between the spindle straddles. There is also the movable spike axial-symmetrically situated inside the mandrel.
EFFECT: extended technological capabilities.
24 cl, 7 dwg
SUBSTANCE: present invention pertains to military equipment and can be used when making high-precision small arms. A mandrel bar or puncheon is put into the channel of barrelled work-piece and a channel with grooves is formed through rotary forging or drawing. The surface of the work-piece channel is pre-activated and then coated with a composition. The composition assumes functions of lubricant material and provides for a wear-proof coating when making the channel with grooves. The composition contains a mixture of homogeneous and heterogeneous catalysts and dispersion reinforcement systems in viscous carrier and natural minerals in the class of carbonates, halogenides, sulphates, silicates and oxides with combined concentration of 20-40 wt %. The natural minerals are modified until formation of a porous layer of minerals on the surface of the channel, forming hydrophilous-hydrophobic splices, filled with organic ligands. The work-piece then undergoes thermal processing for 2-4 hours at 130-140°C, after which a channel with grooves and a wear-proof coating are simultaneously formed.
EFFECT: reduced labour input in manufacturing with improved tactic-technical and operational characteristics of the barrel at the same time.
2 cl, 5 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to metal forming and can be used in production of ribbed panels intended for bodies of compartments, bulkheads, wings and other parts of aircraft and spacecraft. Heated blank is strained at the rate of 0.01-10 mm/s, in steps over the sections, with gradual forming of the entire surface. Area of said sections is at least two times smaller than that of said blank. Straining is executed at the device to be secured in die unit for isothermal die forming. Proposed device comprises top and bottom plates, heaters, female die, male dies with cavities shaped and sized to panel ribs and at least two male die holders. The latter displace in guide columns. It includes sliding thrust plates with drive. One male die is rigidly fixed in male die holder. Other male dies are fitted in their holders and spring-loaded and can displace in direction of forming force application.
EFFECT: enhanced processing performances.
2 cl, 5 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to metal forming and may in production of hexagonal sections by radial forging. Blank is squeezed by two mutually perpendicular airs of flat dies. Working surfaces of flat dies of one pair are shifted along hammering axis relative to those of another pair. Magnitude of said shift is larger than the length of flat die working surface. Flat dies of one pair have smooth working surface. Flat dies of another pier feature working surface composed of cut passes with surfaces arranged at 120 degrees. Said cut passes are shifted relative to each other to get hexagonal section at next to last forging pass in said cut passes with different spacing there between. Spacing between working surfaces of flat dies with smooth working surface is set smaller then the least distance between hexagon faces made at next the last pass. Blank before final pass is turned over through 60 degrees to set said faces at larger spacing there between from the side of flat dies with smooth working surface.
EFFECT: higher quality of sections.
4 dwg, 1 ex
SUBSTANCE: cyclic swaging of a workpiece is performed simultaneously with two mutually perpendicular pairs of strikers. A hexagonal section is obtained in each cycle. Strikers of one pair has a smooth working surface. Strikers of the second pair have cutout grooves with surfaces inclined to each other at an angle of 120°. Working surfaces of mutually perpendicular strikers are offset relative to each other along a forging axis by a value exceeding the length of the working surface of the striker. Swaging of the workpiece in each cycle, except for the first one, is performed by a value that does not exceed difference of diameters of the described circle of the hexagonal section obtained in the previous cycle, and an inscribed circle of the hexagonal section obtained in the considered cycle. After each cycle, the workpiece is turned about the forging axis through angle π/n, where n=6 - number of faces of a hexagonal section.
EFFECT: obtaining quality hexagonal sections at enlargement of the range of initial workpieces and obtained items.
SUBSTANCE: round blank is swaged by two mutually perpendicular die pairs. One die pair has smooth work surface, the other die pair features carved grooves on the work surface. Side surfaces of carved grooves are oriented at 120° angle to each other. Work surfaces of dies are shifted against each other along forging axis. First, round blank is swaged by the die pair with smooth work surface in several deformation cycles. Each cycle includes several runs. Thus, octagonal profile is obtained. Ratio of inscribed circle diameter of this profile to side surface length of carved groove in a die does not exceed 1.93. In each deformation cycle, the blank is turned around its axis before each run in sequence at π/2, π/4 and π/2 angles. Before each deformation cycle, gap between work surfaces of dies with smooth surface is reduced. Finally, swaging is performed with two die pairs at the same time to obtain hexagonal profile.
EFFECT: extended processing capabilities of radial forging to obtain high-quality hexagonal profiles.
FIELD: technological processes.
SUBSTANCE: invention can be used for production of shells with grid of grooves on inner surface. On inner surface of hollow billet grid of corrugated grooves are shaped by female die for pressing with conical working surface with taper angle of 10-45° and central mandrel with mesh of corrugated ledges. Forming grooves is carried out successively in sections. At that, on hollow billet form conical section is formed by crimping of latter with crimping factor of K = 1.2…1.8. For this purpose, hollow billet is pushed through matrix for pitch multiple to workpiece length. Corrugated ledges of rod working surface made with taper angle of 10-45°, are introduced into inner surface of workpiece conical section. Said conical section is formed with mesh corrugated grooves into cylindrical section. Shaping is performed by moving hollow billet in axial direction at pitch with simultaneous forming of next section of conical shape on it.
EFFECT: production of grid of grooves of various shape and dimensions with simultaneous reduction of number of operations.
2 cl, 3 dwg, 1 ex
FIELD: metal processing.
SUBSTANCE: invention relates to metal forming and can be used in radial forging of hexagonal hollow profiles. Round hollow workpiece is subjected to reduction simultaneously with two mutually perpendicular pairs of strikers in not less than three passes. Strikers of one pair have smooth working surface. Strikers of second pair have cutout grooves with surfaces inclined to each other at an angle of 120°. Working surfaces of mutually perpendicular strikers are offset relative to each other along forging axis by a value exceeding length of working surface of striker. After each pass, workpiece is turned about forging axis through an angle which is a multiple of 60°, to change faces hexagonal hollow profile pressed by pairs of strikers.
EFFECT: higher quality of hollow profiles.
1 cl, 8 dwg, 1 ex