JB/T 8325.2-1996 Technical requirements for simple heavy-duty horizontal lathes
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Technical Conditions
CNC Heavy Horizontal Lathe
Subject Content and Scope of Application
This standard specifies the requirements for the manufacture and acceptance of CNC heavy horizontal lathes. JB/T 8325.2-96
This standard applies to general-purpose ordinary precision CNC heavy horizontal lathes with a maximum rotary diameter of 1000 to 5000mm on the bed and a maximum workpiece weight between the tops greater than or equal to 10t. 2 Reference standards
GB5226 General technical requirements for electrical equipment of machine toolsGB6576
GB 9061
JB 4139
Machine tool lubrication system
General technical requirements for metal cutting machine tools
Technical requirements for safety protection of metal cutting machine tools and machine tool accessoriesJB/T 8325.1
ZB J50 003wwW.bzxz.Net
ZB J50 004
Precision of CNC heavy horizontal lathes
Determination of cleanliness of metal cutting machine tools
Determination of sound pressure level of noise of metal cutting machine toolsGeneral technical requirements for machining parts of metal cutting machine toolsZBn J50 008.1
ZBnJ50008.3 General technical conditions for metal cutting machine tool assembly ZBJ50016 General technical conditions for hydraulic system of metal cutting machine tool 3
General requirements
This standard specifies and supplements GB9061, ZBnJ50008.1, ZBnJ50008.3, etc. When accepting machine tools according to this standard, the remaining acceptance items in the above standards that are not specified in this standard must be inspected at the same time. 4 Accessories and tools
4.1 The following accessories and tools should be supplied randomly: a.
Special wrench, one set;
Adjusting shims, anchor bolts, nuts, washers for installation, one set; b.
Lubricating oil gun, one piece.
4.2 The following special accessories can be supplied according to the agreement: a.
Milling head,
Grinding head;
Belt grinding head;
Hydrostatic center frame.
Safety and Health
The hub plate and tailstock should be equipped with limit position safety devices. Approved by the Ministry of Machinery Industry of the People's Republic of China on April 11, 1996 106
Implemented on October 1, 1996
5.2 The slide mechanism should be equipped with a reliable anti-iron chip device. JB/T 8325. 2---96
5.3 Both ends of the guide rails of the saddle, tool holder body, and tailstock lower body combined with the base should be equipped with protective scrapers. 5.4 The spindle bearing should be equipped with appropriate temperature measurement points to accurately measure the temperature and temperature rise of the spindle bearing. 5.5 Inspect the machine tool noise according to the provisions of ZBJ50004. The noise measurement of machine tools shall be carried out under the conditions of low, medium and high speed of the main motion forward and reverse rotation and idling at medium speed of the feed motion. The sound pressure level of the whole machine noise shall not exceed 85dB(A). 5.6 The handle for moving the tool row is an uncommon handle, and its operating force shall not exceed 160N; the operating force of the handle for adjusting the center frame and tailstock shall not exceed 200N.
5.7 When accepting machine tools according to this standard, the remaining acceptance items in JB4139 that are not specified in this standard, as well as the acceptance items specified in GB5226, GB6576 and ZBJ50016, must be inspected at the same time. 6 Processing and assembly quality
6.1 The bed, saddle, spindle box, slide box, tailstock upper body, etc. are important castings, and aging treatment should be carried out after rough processing. 6.2 The main parts of the machine tool such as the sliding guide pair, spindle pair, screw pair, worm gear pair and high-speed heavy-load gears that are easy to wear should take wear-resistant measures that are suitable for their life.
6.3 The guide rails of the saddle and the bed, and the guide rails of the tool holder and the saddle are important guide rails, and wear-resistant cast iron, steel-inlaid guide rails, plastic-coated guide rails or high (medium) frequency induction fire and other wear-resistant measures should be used. 6.4 The following joint surfaces should be assessed according to the requirements of "important fixed joint surfaces": the joint surface of the bed and the bed;
the joint surface of the spindle box base and the bed;
the joint surface of the spindle box and the spindle box base or the bed; d.
the joint surface of the upper and lower bodies of the tailstock;
the joint surface of the saddle and the slide box;
f. the joint surface of the spindle end face and the disc;
the joint surface of the rack, gear ring and the base:
the joint surface of the lead screw, the guide rod bracket and the base. Important fixed joint surfaces should be tightly fitted. After tightening, no insertion is allowed when checking with a 0.04mm feeler gauge, but the local (2-3 places) insertion depth shall not exceed 20mm. The length of the inserted part is less than or equal to 1/5 of the length of the joint surface, but not more than 100mm, which is counted as 1 place.
6.5 The guide rails of the saddle and the bed, the tool holder and the bed shall be assessed according to the requirements of "static pressure and sliding guide rails". 6.6 The guide rails of the tailstock and the bed, the center frame and the bed shall be assessed according to the requirements of "displacement guide rails". 6.7 The faceplate must be subjected to a static balance test and calibrated. 6.8 Cleanliness shall be inspected according to the provisions of ZBJ50003. 6.8.1 The internal cleanliness of the spindle box and the knob box shall be sampled and inspected by weight method, and the impurity and dirt content shall not exceed 400mg/L (spot check). 6.8.2 The cleanliness of the hydraulic system oil shall be sampled and inspected by weight method, and the impurity and dirt content shall not exceed 200mg/L (spot check). 6.8.3 Other parts shall be inspected by visual inspection and hand feel, and there shall be no dirt. 6.9 The following important positioning taper pins shall be inspected by color coating, and their contact length shall not be less than 60% of the working length: a.
Location pins for bed and bed splicing;
Location pins for base and bed splicing;
Location pins for spindle box and base;
Location pins for saddle and slide box;
Location pins for front and rear bearings of spindle and box; Locating pins for connecting screw bracket and base; Locating pins for connecting long screw in sections.
7 Machine tool idle operation test
JB/T 8325.2-96
7.1 The main motion mechanism of the machine tool shall operate at low, medium and high speeds. For machine tools with step-speed changes, they shall be operated in sequence from the lowest speed, and the operation time for each speed level shall not be less than 2 minutes. The operation time at the highest speed should not be less than 1h. Make the spindle bearing reach a stable temperature, measure the bearing temperature and temperature rise near the spindle bearing, and the value should not exceed the requirements of Table 1. Table 1
Bearing type
Sliding bearing
Rolling bearing
7.2The actual deviation of the spindle speed and feed rate should not exceed ±10% of the value indicated on the plate. Temperature rise
7.3Use buttons and switches to manually operate the machine tool to perform functional tests to test the flexibility, stability and reliability of its movements. ℃
7.3.1The main motion mechanism and the feed motion mechanism are respectively tested for starting and stopping (including braking, reversing, jogging, etc.) at medium speed, and the continuous operation should not be less than 5 times.
7.3.2The main motion mechanism and the feed motion mechanism are respectively tested for low, medium and high speed (step speed is each level of speed), and the operation time of each level of speed should not be less than 2 minutes.
7.3.3 Rapid movement mechanism shall be tested for rapid movement, the number of reciprocating tests shall not be less than 3 times, and the stroke shall not be less than half of the full stroke. 7.3.4 Hydraulic, lubrication and cooling systems shall be tested for sealing, lubrication and cooling performance, requiring easy adjustment, flexible movement, good lubrication, sufficient cooling, and no leakage in each system.
7.3.5 Reliability tests of the functions of the safety, protection, reading indication and other devices of the machine tool shall be carried out. 7.4 Use digital control instructions to make each part of the machine tool move, and test its flexibility of movement and the reliability of the digital control function. 7.4.1 Carry out the test in accordance with the provisions of Articles 7.3.1 to 7.3.3 of this standard. 7.4.2 Test the reliability and flexibility of the functions of feed coordinate overtravel, manual data input, position display, return to reference point, program number indication and retrieval, program pause, program elimination, linear interpolation, circular interpolation, linear cutting cycle, taper cutting cycle, thread cutting cycle, circular cutting cycle, tool position compensation, pitch compensation, gap compensation, etc. 7.5 The idling power of the main transmission system (excluding the no-load power of the main motor) shall not exceed 25% of the rated power of the main motor. 7.6 Use digital control instructions to simulate the working state of the whole machine under all functions and conduct continuous idling test to check the flexibility, stability and reliability of various actions. The continuous operation time shall not be less than 16 hours. The stop time between each automatic cycle shall not exceed 1 minute. No failure shall occur during the entire operation.
7.6.1 The main motion mechanism shall be subjected to continuous conversion of low, medium and high gears, forward, reverse, start and stop tests; constant speed working end face test. 7.6.2 The feeding mechanism shall be able to carry out low, medium and high gear feeding and rapid feeding conversion, and its stroke is the full stroke, and the rapid feeding stroke shall not be less than half of the full stroke.
Machine tool load test
This series of machine tools shall be subject to the following load tests. When the manufacturer does not have the test conditions, it can be carried out at the user's factory with the user's consent: operation test of the machine tool bearing the maximum weight of the workpiece (spot check); a.
Maximum torque test of the machine tool main transmission system; b.
Maximum cutting resistance test of the machine tool;
Test of the machine tool main transmission system reaching maximum power (spot check). d
8.1 The operation test of the machine tool bearing the maximum weight of the workpiece shall be carried out at low speed and high speed specified in the design, and the operation time shall not be less than 10 minutes. 8.2 The test of the maximum torque, maximum cutting resistance and maximum power of the machine tool main transmission system shall be carried out in accordance with the design documents.
Maximum power refers to the design power.
8.3 The machine tool should be stable and reliable in various load tests. 9 Machine tool accuracy inspection
9.1 The machine tool accuracy inspection shall be carried out in accordance with JB/T8325.1. JB/T8325.2—96
9.2 Items G8, G12, and G13 shall be inspected at medium speed and stable temperature. 9.3 The test specifications for working accuracy inspection shall be in accordance with the design documents. 9.4 The maximum allowable value of the surface roughness Ra of the test piece during working accuracy inspection shall comply with the following provisions: a. Plane and cylindrical surface, 2.5 um;
b. Conical surface and arc surface, 3.2 um.
9.5 Return to base push point accuracy inspection
Return to the reference point quickly at any position on the X axis (or B axis), and perform at least 5 return to reference point tests, and measure its actual stop position. The error is calculated as the maximum difference in the stop position, and the tolerance is ±0.005mm. 9.6 Minimum setting unit feed accuracy test
9.6.1 Test method
First, quickly move the moving part on the axis to the positive (or negative) direction for a certain distance. After stopping, give several minimum setting unit instructions in the same direction, and then stop. Use this position as the base position, give one minimum setting unit instruction each time, move in the same direction, and move 20 units continuously. Measure the stop position of each instruction. From the above-mentioned final measurement position, continue to give several minimum setting unit instructions in the same direction. After stopping, give several minimum setting unit instructions in the negative (or positive) direction to make it return to the final measurement position. The stop positions of these several minimum setting unit instructions are not measured. Then, starting from the final measurement position, give one minimum setting unit instruction each time, continue to move in the negative (or positive) direction, make it return to the reference position, and measure the stop position of each instruction (see Figure 1). The maximum value of the difference between the distance between adjacent stop positions and the minimum setting unit is the error of the minimum setting unit. Measure at least three positions in the middle of the stroke and near both ends. Each linear motion axis must be inspected. When returning, the moving distance of several minimum setting units shall not be measured. 9.6.2 Tolerance shall be specified by the manufacturer (the recommended tolerance shall not exceed 5 minimum setting units). Minimum setting unit, measuring range 9.6.3 Inspection tools JB/T 8325.2-96 Reading microscope and metal wire scale or laser interferometer. 9.6.4 Calculation of error Minimum setting unit error = mm-m max-distance between adjacent stop positions, mm Where: mm-minimum setting unit, mm. Additional remarks: This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Wuhan Heavy Machine Tool Research Institute. This standard was drafted by Qiqihar Heavy Lathe Research Institute.
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