Numerical control machining method for threaded buckle head

Abstract

A numerical control machining method for a thread buckle head comprises the following steps that after thread turning is completed, parameters of a residual thread buckle are input into a lathe main machine; the starting point of the screwer is positioned according to the parameters of the residual thread buckle, the difference between the starting point of the screwer and the starting point of the thread turning process is 0.5 thread pitch, and it is ensured that the screwer turns the residual thread buckle in a feeding mode; rapid feeding and drawing of the screwer are controlled by increasing the acceleration and deceleration constants of the moving shaft of the numerically controlled lathe and the rotating speed of the main shaft, and the ratio of the acceleration and deceleration constants of the moving shaft of the numerically controlled lathe to the rotating speed of the main shaft is the same as that in the thread turning process; and controlling the screwer to feed repeatedly for multiple times, and turning the residual thread in a layered manner. The length of the thread buckle head can be controlled within 1 / 4 circle arc length, and the angle is steeper and far smaller than 1 / 3 circle arc length, so that it is guaranteed that the thread buckle head can be rapidly and accurately aligned during field assembly, and thread dislocation grinding damage is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control machining of threads, and in particular to a numerical control machining method for thread button heads. Background Art

[0002] After the thread turning is completed, there will inevitably be thread remnants on the thread, resulting in the thread head being too long and affecting the thread assembly. Chinese invention patent CN2006101284152 discloses a method for removing thread remnants using an ordinary CNC lathe, which includes using a cutter on an ordinary CNC lathe after the thread turning is completed, and using its Z-axis tool feed function to adjust the starting Z-axis coordinate value of the cutter relative to the starting Z-axis coordinate value of the tool for turning the thread by 0.5 times the pitch, so that the cutter is directly opposite to the thread crest, and the tool retraction position coordinates are calculated based on the cut-off length of the thread remnants and the Z-axis coordinate value of the tool starting point. In the process of repeated tool feed, the cutting depth is gradually increased to completely remove the thread remnants. However, this method is limited by the original parameters of ordinary CNC lathes. When removing thread remnants, the arc length of removing thread remnants on the circumference is usually 2 / 3 of a circle. Therefore, there will still be thread remnants with an arc length of 1 / 3 of a circle on the thread, and the thread head is still too long. Figure 1 As shown in the figure, the thread buckle head cannot be quickly and accurately aligned during on-site assembly, causing the thread to be misaligned and damaged. Summary of the invention

[0003] The purpose of the present invention is to address the deficiencies in the prior art and to provide a CNC machining method for a threaded button head. The present invention can control the length of the threaded button head within 1 / 4 of the arc length and the angle is steeper, much less than 1 / 3 of the arc length, thereby ensuring that the threaded button head can be quickly and accurately aligned during on-site assembly to avoid thread misalignment and grinding.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: a method for numerically controlling a threaded button head, comprising the following steps: After the thread turning is completed, the thread residual thread parameters are input into the lathe host; Position the starting point of the thread cutter according to the residual thread parameters, so that the starting point of the thread cutter differs from the starting point of the thread turning process by 0.5 pitch, ensuring that the thread cutter can turn the residual thread; By increasing the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed, the thread cutter can be controlled to move and withdraw quickly. The ratio of the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed is the same as that in the thread turning process. Control the thread cutter to repeat the cutting process for multiple times and turn the remaining threads in layers.

[0005] The residual thread parameters are called through the G65 macro program.

[0006] An operation logic constraint comparison speed is set in the subroutine, so that the operation logic constraint comparison speed, the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed are linked according to a certain ratio. By calling the above subroutine through the G65 macro program and adjusting the size of the operation logic constraint comparison speed, the size of the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed can be adjusted.

[0007] Compared with the prior art, the present invention has outstanding substantial features and significant progress. Specifically, the present invention does not need to replace the tool. After the thread turning is completed, the thread cutter is directly used to remove the thread residue, thereby improving the processing efficiency and reducing the cost. On the basis of the original CNC technology for removing thread residues, by increasing the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed, the thread cutter is controlled to move and withdraw the tool quickly, so that the tool can be withdrawn quickly when removing thread residues, and the blade of the thread cutter stays for a shorter time when the workpiece rotates, thereby achieving the purpose of controlling the length and angle of the thread head. The length of the thread head can be controlled within 1 / 4 of the arc length and the angle is steeper, much less than 1 / 3 of the arc length, thereby ensuring that the thread head can be quickly and accurately aligned during on-site assembly to avoid thread misalignment and grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of a threaded button head processed using the original CNC technology for removing threaded buttons.

[0009] Figure 2 It is a flowchart of the work flow of the present invention.

[0010] Figure 3 It is a schematic diagram of a thread button head processed by the present invention. DETAILED DESCRIPTION

[0011] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0012] like Figure 2 As shown, a method for numerically controlling a threaded button head comprises the following steps: Step 1: After thread turning is completed, input the thread residual thread parameters into the lathe host; Step 2: Position the starting point of the thread cutter according to the residual thread parameters, so that the starting point of the thread cutter differs from the starting point of the thread turning process by 0.5 pitch, ensuring that the thread cutter can turn the residual thread; Step 3: By increasing the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed, the thread cutter is controlled to move and withdraw quickly. The ratio of the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed is the same as that in the thread turning process; Step 4: Control the thread cutter to repeat the cutting process several times and cut the remaining threads in layers.

[0013] The residual thread parameters are called through the G65 macro program.

[0014] In order to adjust the acceleration and deceleration constants of the lathe moving axis and the spindle speed, an operation logic constraint comparison speed is set in the subroutine, so that the operation logic constraint comparison speed, the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed are linked according to a certain ratio. By calling the above subroutine through the G65 macro program and adjusting the size of the operation logic constraint comparison speed, the size of the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed can be adjusted.

[0015] In this embodiment, the thread residual thread parameters and the operation logic constraint comparison speed are called by the G65 P8031B_C_I_J_F_Q_ program segment, which is explained as follows: #2=(B large diameter) #3=(C trail) #4=(I starting point) #5=(J end point) #9=(F pitch) #17=(Q operation logic constraint comparison speed); B_C_I_J_F represents the residual thread parameters, Q represents the operation logic constraint comparison speed, so by adjusting the Q value, the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed can be adjusted to control the length of the thread head.

[0016] The working principle of the present invention is: on the basis of the original CNC technology for removing residual thread, by increasing the acceleration and deceleration constant of the moving axis of the CNC lathe and the spindle speed, the thread cutter is controlled to move and withdraw the tool quickly, so that the tool can be withdrawn quickly when removing residual thread, so that the stay time of the blade of the thread cutter when the workpiece rotates is shortened, thereby achieving the purpose of controlling the length and angle of the thread head, and the length of the thread head can be controlled within 1 / 4 of the arc length and the angle is steeper, much less than 1 / 3 of the arc length. Figure 3 As shown, this ensures that the threaded buckle head can be quickly and accurately aligned during on-site assembly, avoiding thread misalignment and grinding.

[0017] The present invention does not require replacement of cutting tools, and after thread turning is completed, a thread cutter can be directly used to remove thread residuals, thereby improving processing efficiency and reducing costs.

[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for numerically controlling a threaded button head, characterized in that: The following steps are involved: After the thread turning is completed, the thread residual thread parameters are input into the lathe host; Position the starting point of the thread cutter according to the residual thread parameters, so that the starting point of the thread cutter differs from the starting point of the thread turning process by 0.5 pitch, ensuring that the thread cutter can turn the residual thread; By increasing the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed, the thread cutter can be controlled to move and withdraw quickly. The ratio of the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed is the same as that in the thread turning process. Control the thread cutter to repeat the cutting process for multiple times and cut the remaining threads in layers.

2. The method for numerically controlling threaded button head according to claim 1, characterized in that: The thread residual thread parameters are called through the G65 macro program.

3. The method for numerically controlling threaded button head according to claim 1 or 2, characterized in that: An operation logic constraint comparison speed is set in the subroutine, so that the operation logic constraint comparison speed, the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed are linked according to a certain ratio. By calling the above subroutine through the G65 macro program and adjusting the size of the operation logic constraint comparison speed, the size of the acceleration and deceleration constants of the CNC lathe moving axis and the spindle speed can be adjusted.

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