General technical conditions for the installation

General technical conditions for machine tool installation

1. The machine tool shall be assembled according to the drawings and assembly process. Machine tool parts must meet the control accuracy and quality requirements. All machined parts are not allowed to be hammered, and unspecified gaskets and sleeves (in special cases, it must be allowed by the designer) are not allowed to be placed

2. Parts and components during assembly should be cleaned and deburred. During the assembly process, the machined surface of the workpiece should not be bumped Scratch "When strength is the focus of consideration and corrosion, the mating surface and exposed surface of the machined parts should not have traces of filing and grinding.

3. After assembly, the bolts, screw heads and end faces of nuts should be in uniform contact with the plane of the fastened parts, and should not be inclined or have gaps. The screws assembled at the same position should have the same length and model. The fastened screws, nuts and bolts should not be loose, which will affect the accuracy." The tightening force of screws should be consistent

4. After the nut is tightened, all kinds of stop rings should meet the braking requirements. According to the needs, the stop ring can be replaced by coating some low-strength and medium strength glue on the thread part

5. The movement of the machine tool, after the assembly of the rotating parts, should move smoothly, flexibly, light, without blocking phenomenon, and the displacement mechanism should ensure accurate and reliable positioning

6. The clearance between the moving disc and the fixed disc with the scale device on the machine tool should be about 0.2mm and the size should be uniform

7. Check the radial and end face runout of the shaft according to the technical requirements

◆ assembly of components

1. Splines, parts with guide flat keys and moving parts should move smoothly after installation

2. The mating side of the flat key and the keyway should not be damaged. After the flat key is installed, the mating surface should be in uniform contact with the keyway, and the two ends of the key should not be cocked. The length of the taper pin at important parts shall not be less than 80% of the working length of the taper pin, and shall be evenly distributed on both sides of the joint, and the large parts shall be exposed on the surface of the workpiece for 2~3mm

3. When assembling adjustable sliding bearings, appropriate clearance should be left

4. During the installation of large bearings, the dimensional tolerances of bearings and shafts and holes matched with bearings must be measured, and they can be installed only after they meet the requirements

5. When assembling the bearing, ensure that it is in place. This kind of material will provide many benefits, with uniform stress and no damage. The contact between the bearing cover at the starting and positioning end and the washer or outer ring is uniform. After assembly, the bearing inner ring should be close to the shaft shoulder or distance ring

6. When assembling the interference fit bearing by heating method, it should be heated evenly, and the oil temperature should be below 150 ℃

7. Generally, the edges of oil grooves of sliding bearings should be blunt

8. When assembling grease lubricated bearings, add an appropriate amount of grease

◆ installation of pulley

1. The radial runout and end face runout tolerance of pulley on shaft shall meet the technical requirements

2. The symmetrical central planes of the two wheel grooves coincide and are perpendicular to the pulley axis; The axes of the two wheels are parallel

3. The tension of the belt is moderate, and there should be no obvious pulsation when driving

◆ installation of sprocket

1. The axes of the two sprockets must be parallel

2. The axial offset of the two sprockets should not be too large. Generally, the center distance of the two sprockets is less than 500mm, and the offset is less than 1mm. When it is greater than 500mm, the offset is less than 2mm

3. The chain sag is appropriate

◆ gear installation

1. Coordination: there shall be no eccentricity and skew for the fixed connecting gear, and there shall be no seizure and block for the sliding gear

2. Ensure that the gear has accurate center distance and appropriate side clearance

3. The axial displacement of the toothed gear shall not be greater than 1mm when the width of the toothed gear rim is less than or equal to 20mm; When the rim width of the toothed gear is greater than 20mm, it shall not exceed 5% of the rim width and shall not be greater than 5mm

4. Contact spots: for general transmission gears, the contact spots are not less than 30% - 50% in gear height and not less than 40% - 70% in width, and their distribution positions are symmetrical up and down at the pitch circle

◆ worm drive

1. The worm axis line is perpendicular to the worm gear axis line

2. The axis line of the worm is in the symmetrical central plane of the worm gear teeth

3. The center distance between the worm gear and the worm is accurate, with appropriate clearance

4. The worm drive is flexible, and there is no blockage during rotation

◆ screw transmission

1. The axis of the screw coincides with the axis of the nut and is concentric, and the axis of the screw is parallel to the motion track

2. Ensure that the axial and radial clearances of the lead screw and the rotation accuracy of the lead screw meet the requirements

3. The lead screw should rotate flexibly without blocking during rotation

◆ assembly of seals

1. Various seals assembled on the machine tool should not be damaged. During assembly, the lip, surface and shaft of the seals should be coated with grease

2. The assembly direction of the seal should make the working pressure of the medium press its lip tightly on the shaft

3. When assembling overlapping sealing rings, each ring should be pressed against each other, and the opening direction should be towards the side with high pressure

◆ assembly of transmission box

1. After the assembly of transmission box, the iron filings and sundries in the box should be cleaned and cleaned after the empty car test

2. The test run has the step-by-step operation from low speed to high speed. The operation time of each speed shall not be less than 2min, and the speed shall not be less than 1h, and the following items shall be checked:

a) the flexibility and reliability of the variable speed control mechanism

b) the operation shall be stable, and there shall be no abnormal scream and irregular impact sound

c) the oil circuit of the lubrication system should be unblocked without blockage, and there should be no oil leakage at all parts

d) the radial runout and axial transmission of the spindle meet the inspection standards of the machine tool

e) when the spindle bearing reaches a stable temperature, its temperature and temperature rise shall comply with the technical regulations of various machine tools

3. After the assembly of the interlocking mechanism of the machine tool, its flexibility and reliability should be ensured

4. The clutch and its control mechanism shall have reliable combining and disengaging performance

◆ hydraulic lubrication part

1. All joints and exposed joints of the hydraulic system should not leak. It is allowed to use sealing ring filler or sealant at the joint and other joints, but it is forbidden to replace it with hemp, silk and other sundries

2. The bending part of the oil pipe should be lubricated, and the short long axis ratio of the bent and flattened oil pipe should not be less than 0.75

3. Before the assembly of the hydraulic system, the joints, pipes, manifold blocks, solenoid valves and oil cylinders should be cleaned

4. Each valve body should act sensitively and react quickly. The action sensitivity of the oil cylinder meets the technical requirements

5. The pipeline setting should be safe and reasonable, arranged neatly, and convenient for component adjustment, repair and replacement

6. The exposed opening of the hydraulic system shall be sealed with a sealing cap, and the external thread must be protected

7. When installing the oil pump, pay attention to ensure the coaxiality of the oil pump shaft and the drive motor drive shaft. The tolerance is 0.05mm for rigid connection and 0.5mm for flexible connection

8. For the oil supply device of intermittent lubrication system, the intermittent cycle should be stable without flow interruption, and the amount of oil delivered to each lubrication point through the quantitative distributor or oil separator should be stable

◆ guide rail part

1. The roughness and contact points of all guide rail scraping surfaces should meet the technical requirements

2. The bonding surface of the applied guide rail should be cleaned, and the bonding of the guide rail surface should be firm without bubbles and gaps. After the applied guide rail is cured, it should be processed according to the relevant technical requirements, and the edge of the guide rail plate should be chamfered and rounded

3. There should be adjustment allowance after the assembly of inlay and inclined iron

4. The bottom surfaces of the two linear guides should be in the same plane and the datum planes on both sides should be parallel

◆ appearance quality

1. The appearance surface of the machine tool shall be free of bulges, depressions, roughness and other damages not specified in the drawing

2. The protective cover of the machine tool should be flat and even, and should not be warped or sunken

3. The appearance surface of the welding part shall be free of hammer marks, welding runs, metal splashes and arc striking traces, and the sharp corners of the edges shall be smooth. The welding slag of all welds shall be cleaned, and the appearance welds shall be polished and leveled

4. The edges of exposed joint surfaces of machine tool parts and components should be neat and uniform without obvious dislocation

the joint surface of the door and cover of the machine tool and the machine tool should be fitted, and the fitting gap value should not be greater than the provisions in Table 1. The gap between the door and cover of the electrical cabinet and electrical box of the machine tool and its related documents should be uniform, and the uneven value of the gap should not be greater than the provisions in the following table

1. Exposed welds shall be leveled and even

2. The screw installed as a counterbore should not protrude from the surface of the part, and there should be no obvious eccentricity between its head and the counterbore. The fixing pin should generally protrude slightly from the outer surface of the part, the tail end of the bolt should protrude slightly from the end face of the nut, and the exposed shaft end should protrude from the end face of the containing part, and the protruding value is about the chamfer value

3. The exposed parts of the machine tool shall be free of bumps and rust. The end faces of screws, rivets and pins shall be free of defects such as sprains and hammers

4. The colors of plated parts, blued parts and blackened parts shall be consistent, and the protective layer shall not fade or fall off

5. The exposed parts of electrical, hydraulic, lubrication and cooling pipes should be arranged compactly and neatly. If necessary, they should be fixed with pipe clamps, and the pipes should not be twisted or folded

◆ paint

1, paint color and stripe ratio meet the drawing standard of "machine tool appearance color processing"

2. The paint layer of the machine tool must be beautiful, flat and smooth in appearance, and uniform in color. The joint of removable assembly joint surface shall be cut after painting, and the edge shall not be broken during cutting

3. The surface of the machine tool is not allowed to have sagging, pitting, orange peel, whitening, bumps, scratches, and loss of gloss

4. There is no residue of adhesive tape, butter, etc. on the bed

5. There is no painting on the surface of scraping and grinding surface, guide rail, bluing parts, screws, lead screws, chrome plated parts, mutual matching parts and lubricating oil holes

6. PVC window frames made of this kind of new reinforcement material can save 15% - 20% of the energy consumption paint layer, and the lines must be clear and tidy

7. The painting of various marks of the machine tool should be beautiful, clear and eye-catching. Paint of different colors shall not be contaminated with each other

8. All kinds of signs on the machine tool should be clear and durable. The nameplate shall be fixed in an obvious position, and the fixed position of the nameplate shall be correct, flat and firm without skew