Before and after the transformation of the technical parameters of the table machine, the technical parameters of the table are modified. The effective stroke of the table is made into the oil chamber of the flat rail and the oil chamber of the single V rail according to the structure of the machine guide rail and the width of the machine guide rail.

Effective bearing area of ​​a single oil chamber 0: (1) Effective bearing area of ​​flat rail 0 = (2++2+) = 892cm2 (2) Effective bearing area of ​​V rail 0 = (2++2+)sin÷6 =395cm2 (3) The total bearing area of ​​the oil chamber = 120 + 60 = 10092 cm 2 The load of the oil chamber is the sum of the load of the table and the weight of the table. The load of the workbench can be roughly divided into three types according to the layout of the workpieces it is working on: (1) no load; (2) uniform load; (3) concentrated load. Stress analysis of these three situations.

The average pressure of the oil chamber is the average pressure of the oil chamber when no-load is 0 (1) The load of the single oil chamber of the flat guide rail == Gong/2=833kg (2) The average pressure of the oil chamber of the flat rail is 0=/0=0.094MPa(3 ) V rail single oil chamber load == work / 4 = 417kg (4) V rail oil chamber average pressure 0 = / 0 = 0.11MPa full load uniform load oil chamber average pressure 1 (1) flat rail single oil The load of the cavity == (work + piece) / 2 == 2500kg (2) The average pressure of the oil groove of the flat guide rail 1 = / 0 = 0.28MPa (3) The load of the single oil chamber of the V guide rail == (work + piece) / 4=1250kg(4)V rail oil chamber average pressure 1=/0=0.32MPa3.3.3 average pressure of oil chamber at full load concentrated load 2(1) bearing of single oil chamber of flat rail == (work + piece) / 2=2500kg(2) Average pressure of flat rail oil chamber 1=/0=0.28MPa(3)V bearing of single oil chamber of rail V==(工+件)/4=1250kg(4)V rail oil chamber average Pressure 2=/0=0.32MPa3.4 Oil supply pressure according to ≥1.5 principle, oil supply pressure=1.5×0.32MPa=0.48MPa, take=0.5MPa3.5 Selection of static pressure oil in the lubrication system of machine tool, press HM-68 anti-wear hydraulic oil is used in the routine, and the hydraulic oil of this grade and other parts of the machine tool The lubricating oil is the same, the viscosity of the oil at 50 ° C = / = (3743) Rees, and its dynamic viscosity = = (33.338.7) × 108kgs / cm2, take = 36 × 108kgs / cm23.6 an oil The required oil supply for the cavity (1) Flat guide rail: Since the machine guide rail is affected by the manufacturing and manufacturing error, the machine guide rail is absolutely straight, and the error of the guide rail in the manufacture and installation is usually between 0.03mm0.035mm. Considering that there should be a certain oil film thickness between the moving pairs, the average oil film thickness is 0.00355cm. The flow rate required for a single oil chamber of the flat rail is =32ml/min. Since the multi-head pump is a standard part, according to the manufacturing specifications of the multi-head pump. A single-stage ZM0002/10 multi-head pump with a single-head flow rate of 40 ml/min (20 heads) is used as a quantitative multi-head pump for supplying oil to the static pressure oil chamber. The oil supply per oil chamber = 40/60 = 0.67 cm3 / s. When the oil supply per oil chamber is 0.67 cm3 / s, the oil film thickness of a single oil chamber is: 0.035 mm.

(2) The average oil film thickness of the V guide rail is 0=0.038mm, and the floating amount of the table is 0/sin=0.046mm. The oil film thickness of the table under the full load uniform load is 1=0.024mm, V guide 1 =0.027mm, the table float amount = 1 / sin = 0.033mm. The oil film thickness of the table under the full load concentrated load flat rail 1 = 0.024mm, V rail 1 = 0.027mm, the floating amount of the table = /sin=0.033mm.

In addition to the stiffness and precision, the beam design of the beam has the function of a milling beam and a fixed beam. Therefore, on the original foundation of the beam, the width and thickness of the guide rail of the beam are increased, and the span between the upper and lower guide rails is enlarged, thereby increasing the rigidity of the beam; the connection between the beam and the column is positioned at the front end of the beam. The boss makes it contact with the original front rail of the column and is bolted and connected. The original top beam and the column are connected with a plurality of threaded joints and hinged positioning pins, and the two columns are adjusted by the strips.

The design of the skateboard design skateboard is relatively simple. According to the designed beam guide and the milling head ram, the corresponding functional requirements are configured. Due to the clamping mechanism of the shaft and the clamping mechanism of the ram on the slide. Therefore, the two sets of clamping mechanisms are all performed by means of hydraulic clamping mechanical relaxation.

Drive chain design shaft drive system Although the surface of the worktable rail is pasted with wear-resistant anti-friction material and it is liquid friction, it is not easy to produce the phenomenon of grinding the guide rail. However, since the bed guide rail and the worktable guide rail are affected by the manufacturing precision, it is impossible. Absolute theoretical straight line, while the workbench has a certain flexibility, so there is also non-liquid friction during the operation of the workbench. Therefore, there are two resistances to the shaft movement during the work of the workbench: (1) the friction force generated by the weight of the table and the weight of the workpiece; and (2) the cutting force generated by the cutting of the tool. After comprehensive consideration, the calculated friction coefficient of the guide rail pair is=0.07.

(1) Motion friction resistance at full load = (work + piece) f = 21000N (2) Cutting resistance of the tool Milling of the milling machine is mainly based on the processing of the disk milling cutter. Therefore, when considering the machining, the machine is usually used according to the specifications of the machine. End milling cutter machining, calculated by the 200mm end milling cutter = 14985N in the design calculation, the table's motion resistance = 36000N.

(3) Rotating torque transmission parts required for screw rotation use ball screw, screw lead = 20mm, ball screw transmission efficiency is 0.850.95, transmission efficiency = 0.85, screw diameter 80mm, screw The torque required for rotation = / (2) = 132Nm.

(4) The gear ratio of the reduction gearbox is because the machine tool is transformed into a numerical control machine tool, so the requirements of the transmission chain are relatively high. Usually, the transmission chain is required to be a gapless transmission. Finally, the motor belt with the reduction ratio of the motor produced by Siemens is =5. Clearance gear reducer. The output torque of the motor is 0=/=26.4Nm.

(5) The minimum cross-sectional diameter min of the screw is used to check the torsional stiffness of the screw according to the driving torque of the screw.

The material of the ball screw is 45 steel. For normal shaft parts, the torsional stiffness is 0.5°1°. Since the ball screw is used in a numerically controlled machine tool, its torsional stiffness is 0.10.15°. According to the torsional strength formula, the minimum diameter of the screw is min=13.6mm.

Since the total length of the screw is about 7250mm and it is supported by two points, and the safety factor is 2.5, the minimum diameter of the screw is=13.6×2.5=34mm. According to the structure of the screw, the minimum shaft diameter of the screw is 55mm.

After the transformation effect and the proposed transformation are completed, the support capacity of the carriage is greatly enhanced compared with the original. The production line is shut down without similar accidents, which greatly reduces equipment failure time and equipment maintenance costs, and brings considerable economic benefits.

Recommendation: The process operator should operate according to the normal operation sequence, that is, after the steel coil trolley is driven to the center position of the mandrel at the time of loading, the outer support of the mandrel is first opened to withstand the mandrel, and then the steel coil trolley is lowered to avoid The device caused other damage.

(Finish)

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