Diagram of spiral trimming die and floating pendulum block trimming die
With the rapid growth of science and technology, the use of metal stamping parts in various industries is becoming more and more common, the quality and size of the product requirements are becoming more and more severe.Some products of the traditional processing technology can not meet the requirements.This metal drawing products are particularly prominent, drawing pieces in the process of drawing, because of the isotropy of the material, uneven thickness and positioning ban or drawing die gap uneven equal reason, will make the top of the drawing workpiece untidy.On the end of the requirements of flush, wonderful parts on the need to make up for the trimming process.Prior to this, simple edge-cutting methods (simple mold flash or edge-cutting on a lathe or spinning machine) were not up to the requirements of the civil service and had little effect.The results can be obtained by using the rotary cutting die with higher machining accuracy.
Rotary cutting die is the short name of the torsional floating swing block edge cutting die.According to the convex concave position can be divided into: formal and anti - installed two;According to the target of cutting edge feed is divided into: axial (longitudinal) edge cutting die (spiral edge cutting die) and diameter (horizontal) edge cutting die (floating pendulum block edge cutting die).Because of the degree of use of the Harbin nut punch bar, there is only the first screw edge cutting die and floating pendulum block edge cutting die.
Helical edge cutting die: diagram of helical edge cutting die and floating pendulum block edge cutting die
(figure 1) shows the layout of spiral edge cutting die
This mould is used for trimming cylindrical drawing parts.
Core 6 can be taken out, when things will be punching on the core, into the screw set 15.When the slider of the press is landing, punch 9 presses down core 6 and drives the punch all the way down, then limit nail 11 presses down slider 14 all the way down.The shape of slider 14 is flat ribbed, the slope of the slider cannot be too big, otherwise the mold is easy to be "killed".(see figure 2)
Slide 14 moves along the spiral cavity of slide seat 7 during its descent. The layout of slide seat 7 is shown in figure 3.
Die 12 also moves relative to the punch, and the hedge stops trimming.When the slide block of the press rises, the top ring 16, under the influence of the spring jack, pushes the slide 14 up to the original position along the screw mark.Spring 2, top ring 17 punch, core out.Take out the punch and core.To facilitate the removal of the punch from the core, there is a screw hole in the core 6, screw into it to facilitate the removal of the core.The length of the blanking piece is controlled by the core 6.
Because this mould can only stop cutting the edge of the cylinder, plus the large processing of the spiral inner cavity, the utilization degree is limited, and it is gradually replaced by the floating pendulum cutting edge die.This mould layout is adopted for the general high (long) drawing piece or cylinder piece.
Two, floating pendulum block edge cutting die:
Floating pendulum edge cutting die has two kinds of formal installation and reverse installation, fenhua nut punching bar is not very different, but the high and low position of the convex and concave die is opposite, other departments are basically the same.See the layout of trimming die for formal floating pendulum (figure 4) :
Side cutting die for reverse mounting floating pendulum (figure 5) :
The two layouts are fundamentally similar, and only the formal floating pendulum block edge-cutting die is assumed here.
1. Layout of formal floating pendulum trimming die (see figure 6)
(figure 6) shows the rectangular floating edge cutting die.Its primary characteristic is that the die 8 is placed on the die support plate 6, and the die support plate 6 and the hole of the lower die base are H9/ H9 together, and the die 8 is always lifted up by the spring jack (not shown in the figure) with the help of pillar screw 12.Before stamping, put part 7 into die 8, supported by roof 2 and spring 3.To avoid deformation of the workpiece, a positioning core 9 is installed in the workpiece, and its shape is the same as that of H7/ H7 in the workpiece.The height of the core is commensurate with the height of the part.The four limit posts 11 are used to limit the clearance between the plane below the punch and the plane above the punch. The value is determined by the thickness of the material, normally 0.05mm.
2. Floating edge cutting principle: fujian nut punching rod
Die things, the upper die with the help of the pressure of the press, punch 10 first press core, production 7, roof 2 and spring, and then down the punch that is to enter the die, but because of the impact of the limit column, punch and die plane connection between the necessary clearance.At this time, the die and the surrounding guide plate 1, 13, 4, 5 always connected to the war.Die in the guide track, not only for upper and lower activity, also make degree mark purpose movement, core have been 9 activities, namely relative activities with the punch, under the influence of shear force, end of the billet shear, and manipulate guide the war shift, make the die according to the displacement differences underlying purpose, progressive cut down over the edge.Figure 2 shows four processes of slow action in which the die relative to the punch displacement cuts the remaining edge.In reality, the stamping brake, that is, the completion of the edge cutting work.