Processing process rules of the hottest vertical m

2022-10-03
  • Detail

The operator must be familiar with the operation manual of the machining center and the performance of the machine tool, and be trained in the theory and practice of the vertical machining center. Only after passing the examination and obtaining the work license can he be qualified to operate the vertical machining center

1. Preparation before startup 2.:

1 Every time the machine is started or the machine is reset by pressing the emergency stop button 2 After bit, 3 First return to the reference zero position of the machine tool (i.e. return to zero), 4 Make the machine tool have a reference position for its subsequent operation

5. Clamping workpiece:

6 Clean all surfaces before clamping the workpiece. 7 No 8 It can be adhered with oil, iron filings and dust, 9 And remove the burrs on the surface of the workpiece with a file (or oilstone)

10. All surfaces of the high-speed rail used for clamping must be ground flat by a grinder, 11 Make it smooth and flat. The size iron and nut must be firm, 12 It can reliably clamp the workpiece, 13 For some small workpieces that are difficult to clamp, they can be clamped directly on the vise

14. Machine tool workbench should be clean, 15 No iron filings, dust and oil stains

16. The sizing block is generally placed at the four corners of the workpiece, 17 For workpieces with too large span, equal height sizing blocks shall be placed in the middle

18. According to the size of the drawing, 19 Use a ruler to check whether the length, width and height of the workpiece are qualified

20. When clamping the workpiece, 21 According to the programming job index 22 Clamping and placement of guide books, 23 It is necessary to consider avoiding the machined parts and the situation that the cutter head may touch the fixture during machining

24. After the workpiece is placed on the sizing block, 25 It is necessary to pull the table of the workpiece datum according to the drawing requirements, 26 The length direction error of the workpiece is less than 0.02mm, 27 The horizontal error of the top surface in X and Y directions is less than 0.05mm. For the workpiece that has been ground on six sides, check whether its perpendicularity is qualified

28. After the workpiece is pulled, be sure to tighten the nut, 29 To prevent clamping failure Firm and 31 The phenomenon that causes the workpiece to shift during processing

32. Pull the meter again. When sorting out the measured data, 33 Confirm that the error is not 34 after clamping Out of tolerance

35. Workpiece touch number: for the clamped workpiece, the touch number head can be used to set the processing reference zero position, 36 The touch head can be photoelectric or mechanical, 37 There are two methods of hitting the election: the middle touch number and the single touch number, 38 The steps of scoring and counting are as follows:

39 Touch count method: photoelectric static, 40 The mechanical speed is 450~600rpm

41. Manually move the x-axis of the workbench, 42 Make the contact head touch one side of the workpiece, 43 When the touch counter just touches the workpiece and the red light is on, 44 Set the relative coordinates of this point 45 The value is zero; Then manually move the x-axis of the workbench to make the touch head touch the other side of the workpiece, 46 When the touch counter just touches the workpiece, record the relative coordinates 47 at this time

48. Subtract the diameter of the contact head (i.e. the length of the workpiece) from its relative value, 49 Check whether the length of the workpiece meets the requirements of the drawing

50. Put this relative coordinate 51 Number divided by 2, 52 The obtained value is the middle value of the x-axis of the workpiece, 53 Then move the workbench to the middle value on the x-axis, 54 Put the relative coordinates of the X axis of this point 55 Value set to zero, 56 This is the zero position on the X axis of the workpiece

57. Carefully set the mechanical coordinate 58 of zero position on the x-axis of the workpiece The value is recorded in one of g54~g59, 59 Let the machine tool determine the zero position on the x-axis of the workpiece. Once again, carefully check the correctness of the data

60. The procedure for setting the zero position of workpiece Y axis is the same as that of 61 The operation of x-axis is the same 62

63. According to the programming job index 64 Book Guide preparation 65 All tools are ready

66. According to the programming job index 67 Tool data for book guide, 68 Change the tool to be processed, 69 Let the tool touch the height gauge placed on the reference plane, 70 When the red light of the measuring device is on, set the relative coordinates of this point to 71 The value is set to zero

72. Move the tool to a safe place, 73 Manually move the tool downward by 50mm, 74 Take the relative coordinates of this point 75 The value is reset to zero, 76 This is the zero position of the Z axis

77. Put the mechanical coordinates of this point 78 The Z value is recorded in one of g54~g59. This completes the zero setting of the X, y and Z axes of the workpiece. Once again, carefully check the correctness of the data

79. The one-sided touch number also touches one side of the X and Y axes of the workpiece according to the above method, 80 Put the relative coordinates of the X and Y axes of this point 81 The radius of the offset touch head is the zero position of the X and Y axes, 82 Finally, put the mechanical coordinates of X and Y axes of a point 83 Write it in one of g54~g59. Once again, carefully check the correctness of the data

84. Check the correctness of zero point, 85 Move the X and Y axes to the side overhang of the workpiece, 86 According to the size of the workpiece, 87 Visually check the correctness of its zero point

88. According to the programming job index 89 The file path of the guide book copies the program files to the computer

90. Setting of processing parameters:

91 Setting of spindle speed in machining:

n=1000 v/(3.14 d)

note: n------ spindle speed (rpm/min)

v------ cutting speed (m/min)

d------ tool diameter (mm)

setting of machining feed speed:

f=n m fn

note: f------ feed speed (mm/min)

m------ number of tool edges

fn------ tool cutting amount (mm/revolution)

cutting amount per edge setting:

fn=z FZ

straw note: Z ----- number of edges of the tool

FZ ----- cutting amount per edge of the tool (mm/revolution)

3. Start up processing:

1 At the beginning of each program, you must carefully check whether the tool used is programmed Refer to 3 in the guide book Fixed tool. At the beginning of processing, the feed speed should be adjusted to the minimum, 4 Single section execution, 5 Concentrate on rapid positioning, knife dropping and knife feeding, 6 Put your hand on the stop key. If there is a problem, stop immediately. 7 Pay attention to the direction of tool movement to ensure safe feeding, 8 Then slowly increase the feed speed to the appropriate, the same as 9 It is necessary to add coolant or cold air to the cutting tools and workpieces. Scholars have used soybean protein to prepare biodegradable materials with good mechanical properties and certain water resistance

10. Not 11 during rough machining Be 4 away from the control surface Reduce the influence of barrel temperature on color difference. The plate is too far, 12 Stop the machine in time for inspection if there is any abnormal phenomenon

13. Pull the watch again after opening it, 14 Make sure the workpiece is not loose. If there is a side, it must be re calibrated and the number of touches

15. Not 16 during processing Cutting optimization processing parameters, 17 Achieve the best processing effect

18. Because this process is a key process, 19 Therefore, after the workpiece is processed, 20 Measure whether the main dimension values are consistent with the drawing requirements, 21 If there is any problem, immediately notify the team leader or programmer on duty to check and solve it, 22 It can only be removed after passing the self inspection, 23 And must be sent to the inspector for special inspection

24. Clean the workbench of the machine tool in time after the workpiece is removed

25. Processing type:

26 Hole machining:

27 Drilling: before drilling on the machining center, be sure to use the center drill for positioning, 28 Then drill with a drill bit 0.5~2mm smaller than the size of the drawing, 29 Finally, finish machining with a suitable drill

30. Reaming processing: for the reaming processing of the workpiece, it is also necessary to use the central drill for positioning, 31 Drill with a drill bit 0.5~0.3mm smaller than the size of the drawing, 32 Finally, ream with reamer, 33 When reaming, pay attention to control the spindle speed within 70~180rpm/min

34. Boring processing: the workpiece shall be bored and positioned with a central drill first, 35 Then drill with a drill bit 1~2mm smaller than the size of the drawing, 36 Then use the rough boring cutter (or milling cutter) to process to a machining allowance of about 0.3mm on one side, 37 Finally, use the fine boring cutter with pre adjusted size for fine boring, 38 The last fine boring allowance is not 39 It can be less than 0.1mm

40. Direct numerical control (DNC) operation:

41 Before DNC NC machining, the workpiece should be installed and clamped first, 42 Set the zero position, 43 Set the parameters

44. Open the processing program to be transmitted in the computer for inspection, 45 Then let the computer enter DNC state, 46 And input the file name of the correct processing program 47

48. Press the tape key and the program start key on the machine tool, 49 At this time, the word LSK flashes on the machine controller

50. Press the enter keyboard on the computer to carry out DNC data transmission processing

4. Content and scope of workers' self inspection:

1 The processor must see the contents of the process card clearly before processing, 2 Clearly know the position, shape and dimensions of the workpiece to be processed, and know the processing content of the next process

3. Before clamping the workpiece, measure whether the blank size meets the requirements of the drawing. 4 When clamping the workpiece, you must carefully check whether its placement is consistent with the programming operation index 5 Guide book is consistent

6. Self inspection should be carried out in time after rough machining, 7 In order to adjust the data with errors in time. The self inspection content mainly includes the position and size of the processing part. For example: (1) Whether the workpiece is loose; (2). Whether the workpiece is correctly divided; (3). Whether the dimension from the processing part to the reference edge (reference point) meets the requirements of the drawing; (4). Position and size of machining parts. After checking the position and size, measure the rough machined shape ruler (except for the arc)

8. Finish machining is carried out after rough machining and self inspection. After finishing, workers should conduct self inspection on the shape and size of the processing parts: detect the basic length and width of the processing parts of the vertical plane; Mark 9 on the measurement drawing for the processing part of the inclined plane The size of the base point

10. Workers complete workpiece self inspection, 11 The workpiece can be removed and sent to the inspector for special inspection only after it is confirmed to be consistent with the drawing and process requirements

IV. cause of error, special attention, list of corrective measures:

cause of error, special attention to corrective measures

1. The length, width and height of the workpiece are not checked. Before being put on the machine, it is necessary to carefully check whether the length, width and height of the workpiece comply with the drawing, and check its correctness by means of ruler, touch number, etc.

2 the placement direction of the workpiece is based on the requirements of the programming operation instruction, and compare the workpiece Determine the placement direction of the workpiece in the drawing, carefully check the direction of the workpiece, and then operate according to the placement of the instruction

3 touch number offset touch number method, check after touch number, check the input data. After touch number, move the spindle to the edge of the workpiece according to the length and width of the workpiece, and check the correctness of touch number; After inputting the data, check its correctness

4 carefully check whether the installed tool is consistent with the instruction with the wrong tool. When executing the first sentence of the procedure, it must be confirmed that the used tool

5 when opening the rough, the tool is broken, resulting in over cutting of the workpiece, the tool is scrapped. When opening the rough, it must not be too far away from the control panel. If there are abnormal phenomena, stop the machine in time to check

6 when the workpiece is shifted and clamped after opening the rough, it must be ensured that the table is pulled again after tightening the rough Touch number

7 the tool used for checking if the workpiece size is less than the number; Inform the programming inspection program to ensure that new tools are used for machining at important positions; Modify or add the program

8 input the wrong file name. Before processing, you must carefully check the file name corresponding to the tool used in the program, and carefully check the correctness of the entered file name

Copyright © 2011 JIN SHI