Workbench of hydraulic drawing press for sheet
The present invention relates to a kind of hydraulic drawing press, relate in particular to a kind of workbench of hydraulic drawing press for sheet.
Existing hydraulic drawing press is for realizing that multiple spot evenly ejects function and generally all is provided with hydraulic die cushion, and its operation principle is as follows: hydraulic die cushion is ejecting under the thrust of oil cylinder, stretches, technology such as flange; After technological process was finished, hydraulic die cushion was got back to original position under backhaul power that ejects oil cylinder and deadweight effect.
As shown in Figure 1, have the pilot hole 2a that feed flow pressure pad 3a places on the sill 5a of hydraulic press, working plate 1a is positioned at sill 5a top, and hydraulic die cushion 3a is provided with a plurality of guide plate 4a, the vertically up or falling of the hydraulic die cushion 3a that is used to lead.Also be provided with several liftout tanks 6a on the sill 5a.
General hydraulic die cushion takes up room very big, therefore bearing rib support works platen can't be installed again, when master cylinder presses down, all pressure drops on the working plate, at this moment, working plate will be in full tonnage pressure state, bigger distortion easily takes place, again because working plate and sill are in the bore edges contact condition all the time, therefore, the distortion of the working plate location bending of sill pilot hole correspondence is particularly serious, like this in order to satisfy shear stress and the bending stress that can bear full tonnage in the working plate cross section, its Thickness Design must proof strength adopt thicker panel construction with preventing to be out of shape, and working plate weight has accounted for complete machine weight quite great proportion thus.
For solving the problems of the technologies described above, the patent No. is that the Chinese utility model patent of ZL200520122979.6 discloses " hydraulic press workbench four post supporting constructions " (Granted publication number: CN2878044Y), this patent is provided with four groups of support columns at least on hydraulic press underbeam liftout tank contact-making surface, each is organized support column and is divided into upper support post and lower support post, upper support post and movable workbench of hydraulic press are connected and fixed, the lower support post is fastened on underbeam and the underbeam liftout tank contact-making surface, between upper support post and lower support post, be provided with certain clearance, with the pilot hole that has on the hydraulic die cushion that the underbeam liftout tank is connected greater than upper support post and lower support column diameter, further, preferred 0.3～the 0.6mm of distance between the gap, its advantage is: the thickness that greatly reduces the movable workbench of hydraulic press top panel, not only save material, reduce manufacturing cost, can also guarantee the intensity and the machining accuracy of machine simultaneously.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of workbench of hydraulic drawing press for sheet in addition at above-mentioned prior art present situation, this hydraulic press workbench can suitably reduce the thickness of working plate, can satisfy the rigidity of certain pressure strength condition lower table plate simultaneously.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: this workbench of hydraulic drawing press for sheet, comprise sill, working plate and hydraulic die cushion, this working plate is positioned at aforementioned sill top position, this hydraulic die cushion is positioned at aforementioned working plate below and places the pilot hole of aforementioned sill upper surface, it is characterized in that being provided with in the described hydraulic die cushion lead that can vertically slide relatively, this lead top is connected with adjusting pad and contacts with described working plate lower surface, and the bottom then is arranged on the described sill.
As preferably, described lead is four, is distributed on the described hydraulic die cushion.
The slip set-up mode of lead and hydraulic die cushion is preferably as follows: described hydraulic die cushion is provided with pilot sleeve, and this pilot sleeve inwall is provided with is convenient to the sliding bearing that lead moves up and down.Described sliding bearing comprises last sliding bearing and the properties of journal bearing lubricated of being located at described pilot sleeve both ends respectively.The described sliding bearing upper end of going up is provided with upper press cover, has last dust ring in this upper press cover, and accordingly, described properties of journal bearing lubricated bottom is provided with lower cover, has following dust ring in this lower cover.
Described hydraulic die cushion upper end has the knock-pin cushion block, and the bottom has the cushion pad that contacts with described sill upper surface, can reduce wear, and increases buffering.
Compared with prior art, the invention has the advantages that: replace guide plate to be used for the hydraulic die cushion guiding with lead in the present embodiment, simultaneously, lead can also be shared the part working plate serves as gripper shoe from the fallen pressure of master cylinder effect, working plate is under the condition that satisfies certain intensity and rigidity like this, and its thickness can suitably reduce, to reduce manufacturing cost, and overall structure is simple, easy to process.
Description of drawings
Fig. 1 is a hydraulic die cushion apparatus structure schematic diagram in the prior art.
Fig. 2 is the example structure schematic diagram.
Fig. 3 is the example structure schematic diagram at another visual angle.
Fig. 4 is an A portion enlarged drawing among Fig. 3.
Fig. 5 is a B portion enlarged drawing among Fig. 3.
Fig. 6 is a C portion enlarged drawing among Fig. 3.
The specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment: referring to figs. 2 to shown in Figure 4, workbench of hydraulic drawing press for sheet comprises sill 5, working plate 1, hydraulic die cushion 3 and lead 7 in the present embodiment, working plate 1 is positioned at sill 5 top positions, hydraulic die cushion 3 places in the pilot hole of sill 5 upper surfaces and is positioned at working plate 1 below, and hydraulic die cushion 3 bottoms are connected with the liftout tank 6 of sill 5.
Hydraulic die cushion 3 upper ends have knock-pin cushion block 31, and the bottom has the cushion pad 32 that contacts with sill 5 upper surfaces.Hydraulic die cushion 3 is provided with lead 7 slidably, and these lead 7 tops are connected with adjusting pad 34 and contact with working plate 1 lower surface, and the bottom then is fixed on the sill 5 by thin nut 72 and nut 71.Lead 7 is four, is distributed on the hydraulic die cushion 3.
With reference to shown in Figure 6, lead 7 is as follows with hydraulic die cushion 3 slip set-up modes: hydraulic die cushion 3 is provided with pilot sleeve 8, these pilot sleeve 8 inwalls are provided with is convenient to the sliding bearing that lead 7 moves up and down, sliding bearing comprises last sliding bearing 9 and the properties of journal bearing lubricated 10 of being located at pilot sleeve 8 both ends respectively, last sliding bearing 9 upper ends are provided with upper press cover 81, has last dust ring 82 in this upper press cover 81, accordingly, properties of journal bearing lubricated 10 bottoms are provided with lower cover 84, have following dust ring 83 in this lower cover 84.
With reference to shown in Figure 5, double-screw bolt 63 1 ends are connected with liftout tank 6, and the other end is fixed on the hydraulic die cushion 3 by a pressing plate 62 usefulness clamp nuts 61.
Hydraulic die cushion 3 is under the promotion of liftout tank 6, and is vertically up by lead 7 guiding, stretches, technology such as flange, and after technological process was finished, hydraulic die cushion was under the backhaul power and deadweight effect of liftout tank 6, by the vertical descending original position of getting back to of lead 7 guiding.When the descending pressed ware four of master cylinder, the pilot hole edge surface that contacts with sill 5 except working plate 1 is stressed, increased the adjusting pad 34 load strong points stressed of four leads.