Horizontal double-sided extrusion folding machine
The domestic XJY112 double-sided extrusion folding machine has been successfully put into use. Its advent, embodies the high level of pursuit of the quality of steel barrels in the Chinese barrel industry, specifically the quality of the barrel body.
About a decade ago, almost all of China's barrel industry used a rolling process to fold the closed barrel. As for the open barrel coil, the rolling process is used without exception and is still in use today. A fatal flaw in the roll-over crimping process is that its forming accuracy is too low.
Figure 1 Process parameters for hemming and coiling
As shown in Figure 1, the flange width B formed by the rolling flange, the flanged arc R and the hemming angle. The accuracy of a is often unsatisfactory. 5è‡³1æ¯«ç±³ä»¥ä¸Šã€‚ The repeating accuracy of the side width B (including the width error of each side of the circumference of a barrel and the inconsistency of the width of the sides between the barrels) often reaches Â± 0.5 ~ 1mm or more. For the open barrel coil, the conventional roll process produces a coil diameter d with poor repeatability. More seriously, since the rolling coil is generally completed on the crimping machine, and the spatial position between the crimping machine and the coiled roller is interfered with, the "flare" is the barrel diameter of the barrel after the coiling. It is larger than the inner diameter of the barrel (D+â–³D in Fig. 1, which is exaggerated in the figure), and the barrel diameter increase Î”D is an indefinite value. This will affect the quality of the top cover seal of the open bucket. When the rolling coil is used for the galvanized barrel, the roller often destroys the galvanized layer of the coiled tube, causing the barrel to rust.
As a steel drum for packaging containers, sealing is the first technical requirement. It can be decomposed into two elements, namely the dimensional accuracy of the top and bottom of the steel barrel and the dimensional accuracy of the barrel flange or the coil. At present, in the barrel industry, the bottom of the steel drum has been generally processed by cold stamping, and the dimensional accuracy is up to Â±0.1 mm. However, for the barrel body, the folding and coiling tube precision Â±0.5~1mm produced by the traditional rolling process obviously cannot be matched with the top and bottom, which becomes a technical defect in the barrel industry.
In 1987, China's first "three-in-one" barrel body joint machine was successfully developed. The extrusion flange technology used in the machine makes the barrel folding and coiling tube repeatability of Â±0.1mm, which is widely used in the barrel industry. Because the "three-in-one" machine completes the three processes of hemming, corrugation and ring ribs in one feeding, the machine structure is complicated and the cost is high. Under the current situation of weak steel drum market, many enterprises hope to play the machine. The technical advantage of the crimping edge is to develop a multi-functional extrusion crimping machine with lower cost.
Figure 2 double-sided extrusion crimping machine
Figure 2 shows the overall structure of the domestic XJY112 extrusion crimping machine that was introduced in May 1998. In order to automate the machining process and facilitate the user to use the production flow, the machine still uses the overall layout of the horizontal double-sided power. The welded base, the cast stand base at both ends and the two top beams form a frame bed. A squeeze cylinder for generating a crimping force is provided at each end of the machine. The lifting robot located in the center of the base and the curved positioning baffle mounted on the top beam are used to position the barrels of various specifications at the working center height of the machine tool, and clamp the hemming parts to prevent the barrel when the working mold is retracted. Shift left and right. The axial adjustment device on the mold mounting seat and the radial adjustment device under the lifting robot can make the processing range of the machine tool after the mold is changed to meet the closed and open barrels of all specifications of 20 to 200 liters listed in GB325-91. The hemming and the coil processing, that is, the material thickness, the diameter and the barrel height can be adjusted within the range of (0.4 to 1.5) x (Ï†280 - 600) x (300 to 1000) mm, respectively. The material thickness adjustment mainly depends on the stepless adjustment function of the working pressure of the hydraulic system. The barrel diameter adjustment is achieved by changing the height of the lifting machine in the T-slot of the cylinder block and the height position of the curved positioning baffle on the top beam. Due to the large barrel height (up to 700mm), the machine has two links to achieve its adjustment. The left side of Fig. 3 is a cross-sectional view showing the axially large stepless adjustment device of the machine tool mold. The hollow plug rod 1 is provided with a adjusting screw 2 of sufficient length to loosen the lock nut 3, and when the sliding seat 4 is rotated, the screw 2 fixed to the sliding seat 4 through the other locking female 5 is simultaneously with the sliding seat Rotating to axially displace in the screw hole of the piston rod 1 to obtain the axial position of the mold required when the barrel height is changed within the range of 300 to 1000 mm. Too much, the screw sleeve 6 must be screwed out of the seat cover 8 through the handle 7 to ensure the mold support guiding twist.
Figure 3 Large adjustment of barrel height
On the right side of Fig This type of device is particularly suitable for large-scale (such as a height of 890mm 200 liter steel drum to a smaller size (such as a height of 350mm 20 liter steel bucket jump change. At this time, can directly remove the 200 liter mold 9 Replace the transition mold base 11 fixed with the 20-liter mold 10, and use the wire 2 as a fine adjustment link.
The above-mentioned large adjustment function for material thickness, barrel diameter and barrel height significantly improves the performance price ratio of the machine tool. It enables the machine to adapt to the 20-200 liter specifications of the closed and open barrels of the GB325-91 specification. The folding and coil forming of the barrel can also be adapted to the production of the international standard steel barrel body of the upcoming 0571.5 barrel series. . In this way, the machine is like a general-purpose punching machine. The mold can be changed quickly to change the processing specifications, and the steel drums required for the production market are produced, and the mold input costs are small.
Since the mechanism of extrusion forming is equivalent to cold stamping, the barrel folding and coiling tube dimensional accuracy of the machine is Â±0. 1mm, which is matched with the cold stamping dimensional accuracy of the top and bottom, which is ideal for triple crimping. Quality basis. The extruded coiled tube not only has a smooth and round appearance, but also has a very regular size and shape. The barrel mouth does not have a "flare" which is inevitable in rolling the coiled tube, nor does it destroy the galvanized layer on the coiled tube. Figure 4 shows the hydraulic drive system of the machine tool. The pressure oil produced by the high-pressure double pump 2 is superimposed on the two ISO4401 international standard series to control the operation of the working cylinder and the auxiliary cylinder. The P pump pressure in the pump 2 is limited by the external control sequence valve 6, and the high pressure P1 pump pressure is adjusted by the electromagnetic relief valve 13. When the system working pressure P or P1 is increased or decreased, the observation adjustment can be performed by means of the pressure gauge switch 15 and the pressure gauge 16. When the working load does not reach the pressure of the external control sequence valve 6, the working cylinder is doubled, and the pump simultaneously supplies oil at high speed. When the system reaches or exceeds the pressure of the valve 6, the external control oil pressure of the P1 causes the valve 6 to be turned on to automatically unload the P circuit, and the motor power is concentrated for driving the high pressure pump to achieve quasi-constant power control. The electric discharge valve 13 unloads the hydraulic system in time to reduce the heat of the true system, whether the machine is in an adjusted state or after an automatic working cycle is returned to the original position. The valve 5 in Figure 4 provides the necessary position signal for automatic machine cycle. Valve 9 provides back pressure for high speed reciprocating motion. The lift positioning pressure can be adjusted by the valve 12, the valve 15 and the pressure gauge 16 in the figure.
Figure 4 Machine tool hydraulic system diagram
The main technical parameters of the machine tool are: maximum processing size (diameter X barrel height) 600x1000mm, automatic automatic operation mode, machine tool productivity 10 parts, machine tool center height 920mm, motor power 7.5kw, hydraulic system rated pressure 14MPa, mainframe size 2700x650x1400mm The hydraulic station measures 850 X 850 x 1400mm.
There are two working states of the machine tool, namely the automatic cycle state during continuous operation and the manual state during discontinuous operation. Both can be selected using the status selection buttons on the electrical box. In the automatic working state, the operator only needs to press the automatic cycle and move the button, the machine will complete the following automatic cycle: the barrel lifting position - the left and right molds fast feed to the hemming position - the system automatically switches to the low speed for extrusion Folding - After the hemming is completed, the system maintains pressure to make the material fully deformed. After the computer discriminates the forming size, the mold is withdrawn from the barrel and the lifting device is lowered to complete an automatic cycle. In the manual state, the corresponding buttons can be clicked as needed to realize independent movement of the machine such as lifting, lowering, squeezing, and squeezing, respectively, for adjustment or intermittent processing.
Author unit: Xi'an Machinery Research Institute
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