Constant cutting depth spiral machining method for inner hole T-shaped groove

Abstract

The invention discloses a constant-cutting-depth spiral machining method for an inner hole T-shaped groove. The method comprises the steps that parts are prepared, a working coordinate system and a machine tool coordinate system are established, meanwhile, the angle center position is positioned, a cutter is clamped, the cutter length and radius are determined, a parameter program is operated, a T-shaped milling cutter cuts the T-shaped groove at a constant cutting depth, and finally whole circle machining is conducted. The method has the advantages that the situation that due to the fact that the diameter of the cutter is too large, the cutter is broken when straight cutting is conducted to the maximum size, and parts are out of tolerance can be effectively avoided through the method, the situation that when the cutter conducts full-cutter cutting, due to the fact that the contact area of the cutter is too large, machining stress is sharply increased can be effectively avoided through the machining method, the machining quality of the parts can be guaranteed, and the machining efficiency is improved. And the saved cost is in direct proportion to the cost of the parts.

Description

Technical Field

[0001] The invention relates to the field of mechanical processing, in particular to a constant cutting depth spiral processing method for an inner hole T-shaped groove. Background Art

[0002] See Figure 3 The threaded hole of the pipe seat has a 2mm to 3mm wide thread backing groove, and the M24 thread bottom hole is φ22.5. The original plan used a φ16T-type milling cutter with radial linear feed. The newly purchased T-slot cutter has a diameter of φ22. The tool diameter is almost the same as the thread bottom hole, and radial linear feed is prone to chipping. Figure 1 . Summary of the invention

[0003] In order to solve the above problems, the present invention discloses a constant cutting depth spiral processing method for inner hole T-slot.

[0004] The specific technical solutions are as follows:

[0005] A method for spiral machining of a T-slot with a constant cutting depth in an inner hole, comprising the following steps:

[0006] Step 1): Prepare parts;

[0007] Step 2): Install the parts on the machine tool and perform clamping and alignment;

[0008] Step 3): Determine the position of the hole center in the positive direction of the Z axis;

[0009] Step 4): Clamp the tool;

[0010] Step 5): Use the in-machine tool setting instrument to confirm the tool length and radius;

[0011] Step 6): The parts begin constant cutting depth processing;

[0012] Step 7): Part processing is completed.

[0013] The step of determining the position of the center hole in step 3) comprises:

[0014] 3.1): Prepare parametric equations;

[0015] 3.2): Assign parameters to the trajectory angle and radius;

[0016] 3.3): Use trigonometric functions to calculate the projection of the radius on the X-axis and Y-axis;

[0017] 3.4): Run the parameter equation to ensure that the tool cutting depth is constant when processing the T-slot.

[0018] The processing method of step 6) comprises:

[0019] 6.1): The tool enters the cutting plane from the safety plane;

[0020] 6.2): ​​radial movement close to the inner circle of the hole; the tool moves linearly to the hole wall;

[0021] 6.3): The tool starts to move in a plane spiral with a constant pitch, cutting the T-slot;

[0022] 6.4): The tool cuts to the final size of the groove;

[0023] 6.5): The tool returns to the center of the hole;

[0024] 6.6): The tool cuts to the outer diameter of the groove;

[0025] 6.7): The tool runs the arc route to cut a full circle;

[0026] 6.8): The tool returns to the center of the hole;

[0027] 6.9): The tool exits the inner hole and the T-slot processing is completed.

[0028] The advantages of the present invention are: when the tool diameter is almost the same as the thread bottom hole, the processing route is decomposed into straight lines, spirals, and full circles to complete the work. This processing method can effectively avoid the situation where the processing stress increases sharply due to the large contact area of ​​the tool when the tool is fully cut, and can ensure the processing quality of the parts, so that the parts can be delivered in a qualified manner, and the cost saved is proportional to the cost of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the tool path map;

[0030] Figure 2 It is a schematic diagram of the position relationship of tool parts;

[0031] Figure 3 It is a cross-sectional view showing the positional relationship of tool parts. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In Figure 1, 1-tool center, 2-tool linear movement trajectory, 3-plane spiral cutting trajectory, 4-arc cutting trajectory, 5-constant pitch;

[0034] Figure 2In, A-tool, B-part, 3-plane spiral cutting trajectory, 5-constant pitch;

[0035] A method for spiral machining of a T-slot with a constant cutting depth in an inner hole, comprising the following steps:

[0036] Step 1): Prepare parts;

[0037] Step 2): Install the parts on the machine tool and perform clamping and alignment;

[0038] Step 3): Determine the position of the hole center in the positive direction of the Z axis;

[0039] Step 4): Clamp the tool;

[0040] Step 5): Use the in-machine tool setting instrument to confirm the tool length and radius;

[0041] Step 6): The parts begin constant cutting depth processing;

[0042] Step 7): Part processing is completed.

[0043] The step of determining the position of the center hole in step 3) comprises:

[0044] 3.1): Prepare parametric equations;

[0045] 3.2): Assign parameters to the trajectory angle and radius;

[0046] 3.3): Use trigonometric functions to calculate the projection of the radius on the X-axis and Y-axis;

[0047] 3.4): Run the parameter equation to ensure that the tool cutting depth is constant when processing the T-slot.

[0048] The processing method of step 6) comprises:

[0049] 6.1): The tool enters the cutting plane from the safety plane;

[0050] 6.2): ​​radial movement close to the inner circle of the hole; the tool moves linearly to the hole wall; the process is completed Figure 1 Processing of section a in the process;

[0051] 6.3): The tool starts to move in a plane spiral with a constant pitch, cutting the T-slot;

[0052] 6.4): The tool cuts to the final size of the groove; completed Figure 1 Processing of middle b section;

[0053] 6.5): The tool returns to the center of the hole;

[0054] 6.6): The tool cuts to the outer diameter of the groove;

[0055] 6.7): The tool runs the arc route to cut a full circle; completed Figure 1 Processing of the middle c segment;

[0056] 6.8): The tool returns to the center of the hole;

[0057] 6.9): The tool exits the inner hole and the T-slot processing is completed;

[0058] The present invention further discloses a program segment for machining an oil inlet pipe of a bearing seat of a certain size according to the above method, the content of which is as follows:

[0059] R1=1 defines the angle parameter R1 as 1 degree

[0060] Z2 quickly locates to a safe plane

[0061] G1 Z-12F50 Linear interpolation moves to the cutting plane Feed 50mm / min G41 X11.225 Y0 Increase tool radius compensation Move to the hole wall

[0062] =============Plane Spiral Cycle=============

[0063] BEGIN: Start of loop

[0064] R6=11.225+0.25*R1 / 360 defines the radius parameter R6 when the angle is R1

[0065] R7=R6*COS(R1) Define X-direction projection R7 equal to radius*COS(R1)

[0066] R8=R6*SIN(R1) Define Y-direction projection R8 equal to radius*SIN(R1)

[0067] G01 X=R7 Y=R8 Positioning

[0068] R1=R1+1 Parameter R1=Parameter R1+1

[0069] REPEAT BEGIN P=1439BEGIN loops 1439 times

[0070] GO G40 X0 Y0 cancel tool radius compensation and move to the center of the slot

[0071] =============Final size full circle interpolation==============

[0072] G41 G01 X11.225 Y0 Increase tool radius compensation and move to slot radius

[0073] G03 X12.225 Y0 I-12.225J0 Circular interpolation one circle

[0074] G40 G0 X0 Y0 Cancel tool radius compensation and move to the slot center

[0075] G0 Z300 Retract

[0076] Through verification, this method can be applied to large-diameter T-shaped milling cutters with large tool diameters or large diameters designed to ensure tool rigidity. When machining inner hole T-shaped slots, a plane spiral macro program is applied to divide the slot depth of 1mm into 4 layers. The cutting depth of the T-shaped milling cutter is constant at 0.1mm to 0.3mm to prevent the problem of chipping caused by excessive cutting force during feed. After the plane spiral macro program is applied, the tool durability is greatly improved, and the quality risk caused by tool chipping is reduced. The present invention is suitable for machining parts with T-shaped slot structures with long overhangs, which helps to improve product manufacturing compliance and has broad application prospects.

[0077] The technical solution of the present invention is as follows:

[0078] 1. The spiral cutting method with constant cutting depth can effectively avoid the chipping of the cutting edge when cutting straight to the maximum size due to the large diameter of the tool, which leads to out-of-tolerance of the parts. This processing method can effectively avoid the situation where the processing stress increases sharply due to the large contact area of ​​the tool when the tool is fully cut, and can ensure the processing quality of the parts.

[0079] 2. Through certain logical relationships, a T-slot parameter program is compiled. The program parameters are easy to modify and can be applied to the processing of internal T-slots of all specifications by compiling them once.

Claims

1. A method for spiral machining of inner hole T-slots with constant cutting depth, characterized in that: The steps include: Step 1): Prepare parts; Step 2): Install the parts on the machine tool and perform clamping and alignment; Step 3): Determine the position of the hole center in the positive direction of the Z axis; Step 4): Clamp the tool; Step 5): Use the in-machine tool setting instrument to confirm the tool length and radius; Step 6): The parts begin constant cutting depth processing; Step 7): Part processing is completed.

2. The method for spiral machining of inner hole T-slots with constant cutting depth according to claim 1, characterized in that: The step of determining the position of the center hole in step 3) comprises: 3.1): Prepare parametric equations; 3.2): Assign parameters to the trajectory angle and radius; 3.3): Use trigonometric functions to calculate the projection of the radius on the X-axis and Y-axis; 3.4): Run the parameter equation to ensure that the tool cutting depth is constant when processing the T-slot.

3. The method for spiral machining of inner hole T-slots with constant cutting depth according to claim 1, characterized in that: The processing method of step 6) comprises: 6.1): The tool enters the cutting plane from the safety plane; 6.2): ​​radial movement close to the inner circle of the hole; the tool moves linearly to the hole wall; 6.3): The tool starts to move in a plane spiral with a constant pitch, cutting the T-slot; 6.4): The tool cuts to the final size of the groove; 6.5): The tool returns to the center of the hole; 6.6): The tool cuts to the outer diameter of the groove; 6.7): The tool runs the arc route to cut a full circle; 6.8): The tool returns to the center of the hole; 6.9): The tool exits the inner hole and the T-slot processing is completed.

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