A kind of pipe-reduction mold
The present invention relates to a kind of mould.Specifically, it is pipe-reduction mold for reducing metal tube end diameter.
In some special occasions, it is desirable to which the diameter of metal tube one or both ends is less than its interlude.At present, metal tube is reduced
The method of end diameter is to carry out hot extrusion to one end of each spot diameter identical metal tube in longitudinal direction using traditional pipe-reduction mold
Press to realize.Pipe-reduction mold therein includes base plate, top board, mould, mould emptier and press mechanism, on the base plate
Lower mould is fixed with the middle of surface, there is vertical centre bore, each point equal diameters of centre bore hypomere, under centre bore epimere is on lower mould
Little big bellmouth, and centre bore upper end bore be adapted by metal tube external diameter, during the draw, by receding metal pipe lower end therefrom
In heart hole upper end insertion centre bore.There is demoulding oil jar base plate lower section, and the piston rod outer end of demoulding oil jar is under the centre bore
Stretch in centre bore at end.Mould is connected with below the top board, there is vertical hole on upper mould, during the draw, by institute's metal tube upper end from perpendicular
Stretch in vertical hole to hole lower end and offset with top board.Down pressing oil cylinder, the piston rod outer end top of down pressing oil cylinder are connected with above upper mould
At top board center.The relative both sides of top board are machined with rod aperture, have in two rod aperture guide post and the two between in being slidably matched, be oriented to
Bar lower end is each attached on base plate.During work, first to being heated by receding metal pipe, then by down pressing oil cylinder piston rod it is overhanging come to top
Plate and pressed by receding metal pipe.After being squeezed in tap web shape by receding metal pipe lower end, restart demoulding oil jar, by taking off
Moulding oil cylinder piston rod overhanging simultaneously will upwards be ejected the centre bore of lower mould by receding metal pipe lower end, so as to realize metal tube one end
Diameter reduce.Although the diminution of metal tube bore can be realized using above-mentioned mould, down pressing oil cylinder and demoulding oil jar are needed
Two oil cylinders, the oil cylinder of needs is more, and equipment investment is more so that production cost is high.Again because upper mould and lower intermode are without preventing from being contracted
The location-plate of metal tube deformation so that by the flexible deformation of receding metal tube capacity during the draw, so, also needs to be equipped with sizing die
Tool, not only processing step is more, low production efficiency.
The content of the invention
The problem to be solved in the present invention is to provide a kind of pipe-reduction mold.Using this pipe-reduction mold, it is possible to decrease production cost,
Improve production efficiency.
The invention solves the problems that the problems referred to above by technical scheme below realize：
The pipe-reduction mold of the present invention includes base plate, bearing, mould, mould emptier and press mechanism, and the bearing contains
There are at least three pillars and top board, along base plate circumferentially, their lower end is fixed on base plate the pillar, the top board is consolidated
It is scheduled on three pillar upper ends.Top board center has and the through hole coordinated by draw mouth, is characterized in there is retainer plate above top board, fixed
There is vertical centre bore on circle, there is the mould in vertical centre bore.The mould is tubulose, and its center has vertically
Hole, each point aperture of the vertical hole epimere is equal, and the vertical hole hypomere is first bellmouth of the upper end aperture less than lower end.
The press mechanism contains top board and lower platen, and the relative both sides below top board are connected with backing plate.Backing plate described in two is strip
Plate, their a long side is fixed on top board lower surface, and their another long side is rested on the lower platen in free shape
Face；There is cross carrying plate between two backing plates, having on top board corresponding with cross carrying plate two ends in the first rod aperture, two first rod aperture has push rod
And in being slidably matched between the two, push rod lower end is placed in above cross carrying plate in free shape；The lower platen is placed in in free shape
On pattern tool.There are two guide rods between lower platen and top board, the two guide rods upper end is connected to the lower surface of lower platen in relative shape
On, there is the second rod aperture on top board corresponding with two guide rods, and two lower end of the guide rod are stretched in the second rod aperture in slip shape.In lower platen
The heart has hole, there is knockout pin in hole, and knockout pin upper end offsets with cross carrying plate lower surface, knockout pin lower end with by receding metal pipe upper end phase
Further improvement of the present invention scheme is that have the second bellmouth corresponding with the first bellmouth on the top board, and
The upper end aperture of the second bellmouth is equal to the aperture of the first bellmouth lower end, aperture and the through hole of the second bellmouth lower end
The further improvement project of the present invention is that have location-plate between the top board and base plate, and there is rod aperture at location-plate center,
Penetrated in the rod aperture by receding metal pipe during work.
As can be seen from the above scheme, due to there is retainer plate above top board, there are vertical centre bore, vertical center on retainer plate
There is mould in hole.The mould is tubulose, and there are vertical hole, each point aperture phase of the vertical hole epimere in its center
It is first bellmouth of the upper end aperture less than lower end Deng, the vertical hole hypomere.The press mechanism contains top board and pushes
Plate, the relative both sides below top board are connected with backing plate.Two backing plate is strip plate, and their a long side is fixed on top board
On lower surface, their another long side is rested on above the lower platen in free shape.There is cross carrying plate between two backing plates, with cross carrying plate
Have the first rod aperture on the corresponding top board in two ends, have in two first rod aperture push rod and the two between in being slidably matched, push rod lower end
Contact with above cross carrying plate in free shape.The lower platen is placed on mould in free shape.Have two between lower platen and top board
Individual guide rod, the two guide rods upper end is connected on the lower surface of lower platen in relative shape, there is the on top board corresponding with two guide rods
Two rod aperture, and two lower end of the guide rod stretch into and the second rod aperture in slip shape.There is hole at lower platen center, there is knockout pin, knockout pin in hole
Upper end offsets with cross carrying plate lower surface, knockout pin lower end with offseted by receding metal pipe upper end.
During work, one downward pressure is applied to mould by top board, backing plate, lower platen by hydraulic jack,
While mould is moved down, metal tube upper end is set to form taper.Then, two push rods, cross-arms are passed through by down pressing oil cylinder
Plate applies a downward pressure to knockout pin, then is given by one downward pressure of receding metal pipe upper end applying by knockout pin, makes to be contracted
The tapering point of metal tube upper end is disengaged with the bellmouth of mould hypomere, it is achieved thereby that the draw processing of metal tube one end.
An oil cylinder is respectively necessary for the shaping of background technology kind with the demoulding to compare, the present invention only needs an oil cylinder, so that it may realize metal tube
The shaping and the demoulding of end, the oil cylinder of needs is few, so as to reduce equipment investment, reduces production cost.Again due to top board with
Location-plate is provided between base plate, there is rod aperture at location-plate center, is penetrated in the rod aperture by receding metal pipe during work, it is to avoid metal tube
Middle flexural deformation, is not required to be equipped with shaping mould, not only reduces processing step, also improves production efficiency.
Description of the drawings
Fig. 1 is the pipe-reduction mold structural representation of the present invention.
As shown in figure 1, the pipe-reduction mold of the present invention includes base plate 15, bearing, mould 10, mould emptier and lower press
Structure.The bearing contains top board 11 and four pillars 14, and along base plate 15 circumferentially, their lower end is fixed on the pillar 14
On base plate 15, the top board 11 is fixed on four upper ends of pillar 14.The center of top board 11 is machined with and the through hole coordinated by draw mouth,
Top board 11 is provided with retainer plate 2 above, and vertical centre bore is machined with retainer plate 2, and it is vertical that the mould 10 is arranged on this
In centre bore.The mould 10 is tubulose, and its center is machined with vertical hole, each point aperture phase of the vertical hole epimere
It is first bellmouth 1 of the upper end aperture less than lower end Deng, vertical hole hypomere.The press mechanism contains top board 5 and lower platen
8, the relative both sides below top board 5 are provided with backing plate 7.Two backing plate 7 is strip plate, and their a long side is fixed on
On the lower surface of top board 5, their another long side is rested on above the lower platen 8 in free shape.Horizontal stroke is provided between two backing plates 7
Load plate 4, the first rod aperture is machined with top board 5 corresponding with the two ends of cross carrying plate 4, be mounted in two first rod aperture push rod 6 and
In being slidably matched between the two, the lower end of push rod 6 is placed in above cross carrying plate 4 in free shape.The lower platen 8 is placed in in free shape
On pattern tool 10.Two guide rods 3 are provided between lower platen 8 and top board 11, the upper end of two guide rod 3 is connected in relative shape and pushes
On the lower surface of plate 8, the second rod aperture is machined with the corresponding top board 11 of two guide rod 3, and the lower end of two guide rod 3 is stretched in slip shape
In second rod aperture.
In addition, be machined with the top board 11 and corresponding second bellmouth 12 of the first bellmouth 1, and the second bellmouth 12
Upper end aperture be equal to the aperture of the lower end of the first bellmouth 1, the aperture of the lower end of the second bellmouth 12 and the diameter phase of the through hole
By receding metal pipe flexural deformation during to prevent the draw, between the top board 11 and base plate 15 location-plate is provided with
13, the center of location-plate 13 is machined with rod aperture, is penetrated in the rod aperture by receding metal pipe during work.
During work, one is applied to mould 10 and is pressed downward by top board 5, backing plate 7, lower platen 8 by hydraulic jack
Power, while mould 10 is moved down, makes to form taper by receding metal pipe upper end.Then, two are passed through by hydraulic jack
Individual push rod 6, cross carrying plate 4 apply a downward pressure to knockout pin 9, then are given by receding metal pipe upper end applying one by knockout pin 9
Downward pressure, makes to be disengaged by the bellmouth of the tapering point of receding metal pipe upper end and the hypomere of mould 10, it is achieved thereby that metal
The draw processing of pipe one end.