JPH01205907A - Nc control in twist drill feed/return on drilling machine - Google Patents

Abstract

PURPOSE:To shorten the drilling work time by successively carrying out a rapid traverse process up to the time when the top edge of a twist drill reaches the surface of a workpiece, crawling feeding process for centering, low speed feed process for boring, and a rapid return process after the completion of working. CONSTITUTION:When drilling work is carried out by using a twist drill, rapid traverse is carried out in a rapid traverse process FF at a speed of e.g. 3m/min until the top edge of the twist drill reaches the surface of a work from an original point A, and centering is carried out in a process Q1 for feeding the twist drill at a speed of 0.5m/min. After centering, the twist drill is fed in a low speed process Q2 at a speed of 1m/min, until the drill reaches the depth Z of the hole, and after the boring work is completed, the drill is returned to the original point A in a rapid return process FB at a speed of e.g. 3m/min. Thus, the boring work time can be shortened, and the working efficiency can be improved.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a drill feed of a numerically controlled drilling machine when drilling a hole in a workpiece using a numerically controlled drilling machine.

The present invention relates to a return control method.

[Conventional technology] For example, the conventionally used upright drilling machine has a main shaft.

A main shaft drive transmission mounted on the top of an upright column.

In the middle, it consists of a feeding device installed to give feed to the spindle sleeve via a small gear and a rack, a table to fix the workpiece, a bed, etc., and a drill is attached to the tip of the spindle and rotated to zero.

Send the drill to the workpiece fixed on the table, press it,
It is designed to drill holes in a workpiece, and the rotational speed and feed rate of the drill can be changed stepwise or steplessly.

[Problems to be Solved by the Invention] However, in the conventional upright drilling machine described above, except when manually feeding the spindle using the drill, the feed rate is changed each time the drill is stopped, and the drilling speed is changed each time. Opening cannot be changed during machining, and the feed rate is inappropriate, making drilling inefficient and difficult to remove chips and chips. There were problems in that the drilling was unsatisfactory, the position, shape and two dimensions of the hole were inaccurate, and the drill broke.

[Means for Solving the Problems] The first method of numerically controlling the feed and return of a drill in a drilling machine according to the present invention to solve the above problems is to use a numerically controlled drilling machine to drill a hole in a workpiece. The process of rapidly moving the drill tip until it reaches the surface of the workpiece, the process of feeding the drill at very low speed for the next centering, and the process of feeding the drill at low speed until it reaches the depth of the hole to be drilled. The process and hole drilling consists of sequentially performing the process of quickly returning the drill after completion.

The second invention involves the process of rapidly forwarding the drill until the tip of the drill reaches the surface of the workpiece when drilling a deep hole at high speed in a workpiece using a numerically controlled drilling machine, and the process of rapidly forwarding the drill until the tip of the drill reaches the surface of the workpiece. The process of sending the drill at a slow speed, then dividing the depth of the hole to be drilled into multiple sections, and the step of sending the drill at a low speed until the set depth of each section, and at the final point of each section, the depth of the hole to be drilled is divided into multiple sections. This process consists of a repeated process in combination with a process of quickly returning a small length drill, and a process of quickly returning the drill to its origin after hole drilling is completed.

The third invention involves the process of rapidly forwarding the drill until the tip of the drill reaches the surface of the workpiece when drilling a deep hole in a workpiece using a numerically controlled drilling machine, and the process of rapidly forwarding the drill for the next centering. A process of sending the drill at a slow speed, a process of dividing the depth of the hole to be drilled into multiple sections, and sending the drill at a low speed to the set depth of the first section, and a step of feeding the drill at a low speed at the final point of each section for centering. A step of quickly reversing the drill to the end point that was sent at a very slow speed, and a step of rapidly forwarding the drill by a length smaller than the length of the step of quickly reversing the previous drill,
Furthermore, the process consists of a repeating process in combination with a process of sending the drill at low speed to the set depth of the next section, and a process of quickly returning the drill to the origin after drilling the hole.

The fourth invention is a process of rapidly forwarding the drill until the tip of the drill reaches the back surface of the workpiece when drilling a hole in a workpiece having a hollow part using a numerically controlled drilling machine, and a process for next centering. The process consists of sequentially performing the steps of sending the drill at a slow speed, sending the drill in the hollow part at a low speed, rapidly feeding the drill in the hollow part, and quickly returning the drill to the origin after drilling the hole. be.

The fifth invention is a process of rapidly forwarding the drill until the tip of the drill reaches the surface of the workpiece, when performing top boring of a hole in a workpiece using a numerically controlled drilling machine, and a process of rapidly forwarding the drill until the tip of the drill reaches the surface of the workpiece, and a process for performing the next centering process. The process of sending the drill at a very low speed, the process of sending the drill at a low speed until it reaches the depth of the hole to be drilled, the process of further spot boring, and the process of quickly returning the drill to its origin after finishing the hole drilling process, It consists of performing the following steps in sequence.

[Operation] According to the present invention, the holes in the workpiece are cut automatically by the above-described means. Since the hole drilling process is performed by fast forwarding or fast reversing in a process where the cutting resistance is low, the cutting time for drilling the hole is shortened. In addition, when drilling deep holes and cutting, if necessary, the drill is pulled out, oil is jetted out, and the generated chips and swarf are removed, so that the drilling and cutting process can be carried out smoothly. .

Since the drill is fed at a very slow speed when centering, breakage of the drill or opening of the hole will not cause any deviation in position, shape, or dimensions.

[Example] Embodiments of the present invention will be described with reference to the drawings.

FIG. 9 shows an example of a numerically controlled drilling machine for carrying out the present invention, in which 2 is a drill, 2 is a main shaft to which the drill 2 is attached at the tip and rotates the drill 2, 3 is a main shaft rotation transmission, 3a is a main shaft motor, 3b is a transmission, 4 is a moving base on which the main shaft rotation transmission 3 is attached, 4a is a protection plate hanging down from the lower end of the moving base 4, and 5 is a drill l together with the main shaft U-rotation transmission 3. It is a feeding device that moves up and down, and includes a servo motor 5a, a reducer 5b, and a feed screw mechanism 50.
, and a bearing 5 f * 5 F. The feed screw mechanism 5c has two parallel Il! L! It consists of a rod 5d (only one is visible in the 5th d, and there is another one behind it) and a screw tM5e provided on the moving table 4. 6 is the feed r
With a stand that supports 5! +! ! ! The rod 5d is a bearing 5f,
5 supports the stand 6. 7 supports the stand 6,
The workpiece 8 is placed on a bed, 9 is a setting device for setting conditions for hole drilling, and 10 is an operation control panel equipped with various switches, indicator lamps, and a reset button. FIG. 10 is a front view of the setting device 9.

First, the functions of the numerically controlled drilling machine having the above configuration will be explained.

The rotation of the drill 1 is controlled via the main shaft 2 by a main shaft rotation transmission device 3 comprising a main shaft motor 3a and a transmission 3b.

To feed the drill l, the rotation of the servo motor 5a of the feeding device 5 is decelerated by the reducer 5b, and the screw rod 5d is rotated to convert it into vertical movement of the screw hole 5e. a moving table 4, a main shaft rotational transmission 3 attached to the moving table 4, and a main shaft rotational transmission 3
This is done by transmitting power through a main shaft 2 attached to the main shaft 2.

Next, a method of controlling sending and returning will be explained.

In the first invention, as shown in FIG. 1, the drill 1 until the tip of the drill 1 reaches the surface of the workpiece 8 is
Process FF that fast forwards at a speed of +/+win.

For example, set drill 1 to 0.5 for the next centering.
Step Q1 of sending the drill at a slow speed of m/ggin, after which the drill l is 1m+/mi until it reaches the depth 2 of the hole to be drilled.
The step Ql of sending the drill at a low speed of n, and the step FB of rapidly returning the drill l to the origin A after hole drilling is completed at a speed of 3 m/win, for example, are performed in sequence.

The second invention for high-speed deep hole drilling is, as shown in FIG. The process Q1 of feeding the drill l at a slow speed is the same as the first invention, but the subsequent process is as follows. In other words, the depth of the hole to be drilled is divided into multiple sections,
Set the depth of each section, for example, 1 m for drill 1.
A process Q1 of sending the drill at a low speed of /min and a process Fr? of quickly reversing the drill l to a length smaller than the length of the process Q2 at the final point of each section. The repeating process consisting of the combination of and the process FB of rapidly returning the drill 1 to the origin A after completion of hole drilling are sequentially performed.

The third invention regarding deep hole drilling differs from the second invention in the following points. That is, as shown in FIG. 3, following the step Q1 in which the drill 1 is sent at a very slow speed for centering, the depth of the hole to be drilled is divided into multiple sections, and the drill 1 is moved until the depth is set in the first section. Process Q2 of sending at low speed
At the end point of each section, the drill l is sent at a very slow speed for centering, and then the drill l is quickly returned to the end point, and the process FF is fast-forwarded by a length smaller than the length of the process FR. This is to sequentially perform a repeating process in combination with a process Q2 in which the drill 1 is fed at a low speed to a set depth in the section.

A fourth invention for drilling a hole 11.11 in a workpiece having a hollow portion such as a pipe material 8a1 and a shape material 8b shown in FIGS. 5 and 6 differs from the first invention in the following points. . That is, as shown in FIG. 4, following a step Q1 in which the drill l for centering is fed at a slow speed, a step Q2 in which the drill 1 in the hollow portion is fed at a low speed, and a step FF in which the drill 1 in the hollow portion is rapidly fed are performed. This should be done in sequence.

As shown in FIG. 8, a fifth invention for drilling a hole 11 in a workpiece 8 and performing counterboring 12 is a method of drilling a drill l until it reaches the depth of the hole to be drilled according to the first invention. A counterboring process Q3 is sandwiched between a process Q1 of sending at a low speed and a process FR of quickly returning the drill 1 to the origin A.

In carrying out the above control method, the setting device 9 is set as follows. That is, the speeds of the fast forward FF and fast reverse FR are fixed at approximately 3 m/win.

For hole drilling, feed speed and rotation speed are set respectively for cutting and counterbore. For fast forwarding, fast reversing, and drilling, determine the order of operations for each process such as cutting and drilling, and then set the feed amount by pressing the ramp pushbutton for the process corresponding to the order number.

If you want to repeat the same process, press the repeat button,
Set the number of iterations. When setting the feed speed, rotation speed, feed amount, and number of repetitions, press the selection button for each setting item, then press the setting button for each digit in turn, and change the numbers from 0 to 1 to 1.
Change it to 2-3... to match each set number. To return, press the setting button in front of the number and add a - symbol. By pressing the start switch after making these settings, the drilling machine can be operated to drill the desired hole in the workpiece.

[Effects of the invention] When drilling holes in a workpiece using a numerically controlled drilling machine, by applying the numerical control method for feeding and returning the drill shown above, it is possible to perform fast forwarding in processes where the load is not very high (17). Alternatively, it can be done by reversing quickly, and there is no need to stop to change conditions midway, making it possible to shorten the machining time and improve efficiency.

In addition, when cutting between deep holes, the drill can be pulled out multiple times during the cutting process and chips and swarf can be removed by squirting oil. The slowdown problem is resolved.

Since the drill 1 is now fed at a very slow speed during centering, the centering is accurate and the position, shape, and dimensions of subsequent hole drilling will not be inaccurate.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a control schedule of an embodiment of the first invention, FIG. 2 is a diagram showing a control schedule of an embodiment of the second invention, and FIG. 3 is a diagram showing a control schedule of an embodiment of the third invention. FIG. 4 is a diagram showing a control schedule of an embodiment of the fourth invention, and FIGS. 7 is a diagram showing a control schedule of an embodiment of the fifth invention; FIG. 8 is a cross-sectional view showing a situation in which a hole is drilled in a material; FIG. 8 is a diagram showing a control schedule for an embodiment of the fifth invention; and FIG. 9 is a conceptual side view of a numerically controlled drilling machine for detailed explanation of the present invention, and FIG. 10 is a front view of a setter attached to the numerically controlled drilling machine of FIG. 9. l Drill 2 Main shaft 3 Main shaft drive transmission 3a Main shaft motor 3b Transmission 4 Moving table 4a Protective plate 5 Feeding device 5a Servo motor 5b Reducer 5C feed reversing mechanism 5d Insert pin 5e Threaded hole 5f Bearing 6 Stand 7 Bed 8 Workpiece 9 Setting device 10 Control board 11 Hole 12 Spot boring

Claims (1)

[Claims] 1. When drilling a hole in a workpiece using a numerically controlled drilling machine, a process of rapidly forwarding the drill until the tip of the drill reaches the surface of the workpiece, and a drill for centering the next step. Drill feeding on a drilling machine consists of sequentially performing the following steps: feeding the drill at a very low speed, feeding the drill at a low speed until it reaches the depth of the hole to be drilled, and quickly returning the drill to its origin after drilling is completed. , Numerical control method for return. 2. When drilling deep holes at high speed in a workpiece using a numerically controlled drilling machine, the process involves rapidly forwarding the drill until the tip of the drill reaches the surface of the workpiece, and then sending the drill at a very slow speed for centering the next step. Next, the depth of the hole to be drilled is divided into multiple sections, and the drill is sent at low speed to the set depth of each section, and the length of the drill is smaller than the length of each section at the final point of each section. A method for numerically controlling the feeding and returning of a drill in a drilling machine, which comprises sequentially performing a repeating process in combination with a process of quickly returning the drill, and a process of quickly returning the drill to its origin after completing drilling. 3. When drilling a deep hole in a workpiece using a numerically controlled drilling machine, the process of rapidly feeding the drill until the tip of the drill reaches the surface of the workpiece, and the process of feeding the drill at very low speed to center the next one. , the process of dividing the depth of the hole to be drilled into multiple sections and sending the drill at low speed to the set depth of the first section; once at the final point of each section, the drill is sent at slow speed for centering. By combining the process of rapidly reversing the drill to the end point, the process of rapidly forwarding the drill by a length smaller than the length of the process of rapidly reversing the previous drill, and the process of further feeding the drill at a low speed to the set depth of the next section. A method for numerically controlling the return of the feed of a drilling machine, which comprises sequentially carrying out the repeating process of 1. 4. When drilling a hole in a workpiece with a hollow part using a numerically controlled drilling machine, there is a process of rapidly forwarding the drill until the tip of the drill reaches the back side of the workpiece, and a process of moving the drill at very low speed for the next centering. The drill feeding and returning process of a drilling machine consists of sequentially carrying out the following steps: feeding the drill in the hollow part at low speed, rapidly feeding the drill in the hollow part, and quickly returning the drill to the origin after drilling is completed. Numerical control method. 5. When counterboring a hole in a workpiece using a numerically controlled drilling machine, there is a process of rapidly forwarding the drill until the tip of the drill reaches the surface of the workpiece, and a slow speeding of the drill for the next centering. Sequentially carry out the feeding process, the process of feeding the drill at low speed until it reaches the depth of the hole to be drilled, the further process of counterboring, and the process of quickly returning the drill to its origin after completing the counterboring of the hole. Numerical control method for drill feed and return on a drill press.