JPS6347008A - High-speed cutting machine - Google Patents

Abstract

PURPOSE:To provide possibility of change in the cutting length without stop of high-speed cutting in manufacturing tubes, by rotating a rotary flange pipe and a crank shaft in different speeds by the use of a revolving speed changing mechanism, and thereby changing the eccentricity of an eccentric pin. CONSTITUTION:A process preparatory motor 57 is operated for a short time in accordance with the cutting length by a control unit, and a shaft 54 is rotated to change the revolving speed of a rotary flange pipe 37 at the same speed as the crank shaft 35 through a differential mechanism 53, and a planet gear 43 orbits round a pin 42, and the center of an eccentric pin 46 displaces while drawing a straight locus in the radial direction of an internal gear 44. After a specified amount of eccentricity r is attained, a motor 57 is stopped and the crank shaft 35 and flange pipe 37 rotate at the same speed, and the planet gear 43 orbits along said internal gear 44. Control pulses indicating the cutting length are fed to a pulse motor 30 from control unit, and rotation is made at a speed which enables cutting of a tube at the cutting length after alteration, and a connecting rod 9 is reciprocated, and the rotary cutting edge is reciprocated with specified strokes and speed according to the advance of the tube.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is a method for cutting objects to be cut, particularly flat tubes used in automobile heat exchangers, such as radiators and condensers, at high speed and with high precision. This invention relates to an improvement of a high-speed cutting machine for cutting into small pieces.

(Prior Art) First, a conventional high-speed cutting machine of this type shown in FIGS. 4 and 5 will be described.

1 is the object to be cut, which is a flat tube for a heat exchanger, and includes a tube making machine that shapes the strip tube material into a tube shape, a vertical roller that processes the tube into a flat shape, and a machine that applies solder plating to the tube surface. It is continuously supplied from a tube manufacturing device (not shown) that includes solder plating, sizing rollers for removing distortion of the tube, and the like. A contact roller 2 is brought into contact with the supply side of the flat tube 1. The contact roller 2 is connected to an analog-to-digital converter 3 which generates one pulse each time the contact roller 2 rotates through a certain angle. The output of the analog-to-digital converter 3 is guided to the drive unit 4 through a waveform shaping circuit (not shown), and the drive unit 4 converts it into a rotation signal necessary to drive the electro-hydraulic pulse motor 5. It was sent to 5th. Thus, a crankshaft 6 is directly connected to the shaft of the electrohydraulic pulse motor 5. A crank 7 is attached to the crankshaft 6.
and l1jl it 8 are fixedly installed, and the crank 7
The amount of eccentricity of the connecting rod 9 can be adjusted using an eccentricity adjustment screw 10. The connecting rod 9 has sector teeth I
It is for driving ¥111.

A slider 12 is slidably supported by two rails 13, and a rack 14 that meshes with the sector gear 11 is provided on a part of the side surface so that it can reciprocate as shown by arrow A1B. Numeral 15 is a gear that forms a transmission mechanism in combination with the gear 8, and rotates a spline shaft 17 via a helical gear 16. Reference numeral 18 denotes a rotary cutting blade for cutting the flat tube 1, which is attached to a spline shaft 17, and the spline shaft 17 is held on the slider 12 by a bearing 22. A cutting blade holder 19 is attached to the slider 12-2, and a female blade 20 is disposed in the holder 19 so as to hold the rotary cutting blade 18 therebetween. As shown in FIG. 6, the cutting mechanism consists of a rotary cutting blade 18 and a female blade 20. The rotating cutting blade 18 is provided with a wedge-shaped tip 18a protruding in the radial direction on a part of its outer circumference, and the female blade 20 has a wedge-shaped cutting edge 18a that protrudes in the radial direction. A hole 20a into which the flat tube 1 is inserted is provided. In this cutting mechanism, the eccentricity of the connecting rod 9 can be adjusted by the eccentricity adjustment screw 10, and the slider 12 can be made to follow the flat tube 1 at the same speed as the flat tube 1. The center angle a of the cutting edge 18a of the rotary cutting blade 18 is selected so that the rotating cutting blade 18 rotates and cuts the flat tube 1 at the time when the rotating cutting blade 18 follows the angle 1. Note that 21 is a guide for guiding the flat tube 1.

To explain the operation of the conventional device having the above configuration, a flat tube 1 is supplied from a tube manufacturer fIIi (not shown), and when it starts moving, an analog-to-digital converter 3 is rotated by a contact roller 2, and the flat tube A number of pulses proportional to the speed of movement of the motor 1 are generated, which pulses are supplied to a drive unit 4 and an electro-hydraulic pulse motor 5.
rotates by a rotation angle corresponding to the number of generated pulses. As a result, the crank 7 and gear 8 fixedly attached to the crankshaft 6 directly connected to the electro-hydraulic pulse motor 5 rotate, and the rotation of the crank 7 causes the connecting rod 9 to reciprocate, causing the sector gear 11 to swing. Slider 12 moves as shown by arrows A and B.
It makes a reciprocating motion like this. On the other hand, due to the rotation of the gear 8, the gear 15 that forms a transmission mechanism in combination with the gear 8 rotates,
A spline shaft 17 rotates via a screw gear 16. Then, when the slider 12 follows the moving speed of the flat tube 1 at the same speed as the moving speed of the flat tube 1 during the forward stroke of the slig 12, the flat tube 1 is cut by the rotary cutting blade 18.

By the way, when the cutting length of the flat tube 1 is short, the rotary cutting blade 18 is rotated once and cut once for each reciprocation of the slider 12, but when the cutting length of the flat tube 1 is long, the cutting length of the slider 12 is cut once. Since the two culms are long, there is a limit to how high the cutting speed can be increased due to the inertia of the slider 12 and the like. Therefore, the rotation ratio of gear 8 and gear 15 is selected, and slider 1
For two reciprocations or three reciprocations of 2, the rotary cutting blade 18 is rotated once to cut once.

In addition, the rotation ratio of the gear 8 and the gear 15 is set to 2:1, and the rotary cutting blade 18 is rotated once by two reciprocations of the slider]2.
That is, when cutting once with two rotations of the contact roller 2,
If the cut length of the flat tube 1 is L, the diameter of the contact roller 2 and the following distance of the slider can be obtained by the following equation.

Contact roller diameter = (L + cutting distance) / 2π Slig follow-up distance = (1, 10 cutting distance) / 4 Therefore, by replacing the contact roller 2 and adjusting the eccentric adjustment screw 10, the slider 1
By changing the following distance in step 2, the cutting length I of the flat tube 1 can be steplessly selected within a certain range.

(Problem to be Solved by the Invention) By the way, in the case of a conventional dual high-speed cutting machine, when attempting to change the cutting length, the tube making machine and the high-speed cutting machine are temporarily stopped, and the contact roller 2, and in order to change the following amount of the slider 12, it was necessary to loosen the eccentricity adjustment screw 10 and adjust the crank eccentricity.

For this reason, it takes at least 5 to 10 minutes for setup, resulting in a decrease in equipment operating rate. More Chico.

- In order to temporarily stop the production of shrimp, the tubes in the rice plating furnace became defective during the stoppage, which was a problem in reducing the defective rate.

(Means for Solving the Problems) The present invention solves the above problems, makes it possible to automatically change the cutting length without stopping the operation of the tube manufacturing machine and high-speed cutting machine, and improves the equipment operating rate. It is an object of the present invention to provide a high-speed cutting machine that can improve the performance and reduce the defective rate.

The structure of the present invention that meets this objective includes a contact roller that rotates in frictional contact with the object to be cut, and an analog-to-digital converter that is connected to the contact roller and generates a number of pulses proportional to the moving speed of the object to be cut. , a crank 8 which has a pulse motor that rotates in synchronization with the pulse, and an eccentric pin whose eccentricity can be adjusted! a slider that is reciprocated along the object to be cut by the pulse motor via the crank mechanism, and a rotary cutting blade that is attached to the slider and rotated by the pulse motor via a speed change mechanism; A high-speed cutting machine configured such that the slider follows the workpiece at the same speed as the workpiece, the workpiece is cut by the rotating cutting blade, and the following distance of the slider can be changed by adjusting the eccentricity of the eccentric pin. a rotating flange pipe rotatably attached to the
Note: A crankshaft rotatably inserted into the rotating flange pipe, a planetary tooth Ill rotatably attached to the surface of the crankshaft 1, and a planetary gear fixedly attached to the upper surface of the rotating flange pipe and meshing with the planetary gear. An internal gear having a pinch circle diameter twice the pitch circle diameter of the planetary teeth IIf is connected to the pulse motor and the rotary flange pipe; A variable rotational speed mechanism for switching between rotational speeds that are the same as and different from the rotational speed of the crankshaft, and a cutting F that calculates and processes the pulses based on the cutting length of the object to be cut.
drive control means for driving the pulse motor at a rotation speed corresponding to c, the eccentric pin is installed on the upper surface of the planetary gear, and the eccentric pin is arranged so that the center thereof is on the pitch circle of the planetary gear. The gist is what was established.

(Function) According to this configuration, while the rotating flange pipe is rotating at the same rotational speed as the crankshaft, the planetary gear does not rotate and revolves along the internal gear, and no differential angle occurs. ,
When changing the cutting length of the object to be cut, drive! The rotational speed of the pulse motor is automatically adjusted according to the cutting WI length by the II control means, and at the same time, when the rotational speed of the rotating flange pipe is made different from the rotational speed of the crankshaft by the variable rotational speed mechanism, the planetary gear rotates. A differential angle occurs. Since the ratio of the pitch circle diameters of the planetary gear and the internal gear is set to 1 = 2, the center of the eccentric pin is linearly displaced in the radial direction of the internal tooth Ill as a differential angle occurs, and the eccentricity of the eccentric pin is amount is changed. If the rotational speed of the rotating flange tube is then returned to the same rotational speed of the crankshaft, the planetary gear will revolve without rotating, so the eccentricity after the change will be maintained.

(Example) An example of the present invention will be described below based on FIGS. 1 and 2. Note that the same components as those of the conventional device described above are given the same numbers and will be briefly described.

A contact roller 2 is disposed on the supply side of the flat tube 1, which is the object to be cut, in contact with the flat tube 1, and the contact a-22 is connected to the analog-to-digital converter 3. This analog-to-digital converter generates one pulse each time the hand pull rod 22 rotates by a certain angle, and supplies the generated pulse to the drive control means 4. The drive control means 4 includes a memory and calculation circuit preset to process the pulses supplied from the analog-to-digital converter 3 and generate control pulses corresponding to different cutting lengths. is configured to be driven at a rotational speed corresponding to a predetermined cutting length.

The pulse motor 30 has a stay 3 fixed to a base 31.
A gear 34 is fixed to the shaft 33 of the pulse motor 30. 35 is the crankshaft 35,
A gear 36 fixed to the lower end meshes with the gear 34. Reference numeral 37 denotes a rotary flange tube, which is rotatably attached to the crankshaft 35 by bearings 38, 39 and rotatably removed from the base 31 by bearings 40, 41. A planetary gear 43 is rotatably attached to the upper surface of the crankshaft 35 by a pin 42, while an internal gear 44 is fixed to the upper surface of the rotating flange pipe 37, and the planetary gear 43 and the internal gear 44 mesh with each other. are doing. The pitch circle diameter DI of this planetary gear and the pitch circle diameter of the internal gear. The ratio is set to 1:2. Further, a mounting plate 45 is fixed to the second surface of the planetary gear 43, and an eccentric pin 46 is mounted on the mounting plate 45, and arranged so that the center of the eccentric pin 46 is located at the pitch circle of the planetary gear 43. It has been done. A pair of id 48.4.8 forming a straight id 271747 is fixedly installed on the second surface of the internal gear 44, while four slide tubes are connected to the eccentric pin 46 through the metal 5o. The slide tube 49 is loosely fitted into the guide groove 47 so that it can linearly slide within the guide groove 47. Furthermore, a washer 51 and a metal 52 are attached to the eccentric pin 46.
One end of the connecting rod 9 is rotatably attached via.

Next, 53 is a differential tooth JII device, to which a shaft 7) 54, 55 is rotatably attached and a gear 56 is fixed. The shaft 54 is connected to a setup motor 57 fixed to the base 31, and the shaft 55 is connected to a gear 5.
8 is fixed, and the tooth *58 meshes with the gear 6o fixed to the crankshaft 35. Also, the tooth *56 meshes with 115 teeth fixed to the rotating flange w37. Reduction ratio of gear device 53, gear 56 and teeth J
fiS9 and the tooth number ratio between teeth M158 and teeth Jli 60, when the setup motor 57 is not driven and the shaft 54 does not rotate, the crankshaft 35 and the rotating flange pipe 37
The rotation speeds are set to be the same.

When the setup motor 57 is driven to rotate the shaft 54, the rotation speed of the rotary flange pipe 37 changes and is configured to differ from the rotation speed of the crankshaft. This differential gear device 53 includes a pulse motor 30 and a rotating flange pipe 37 formed by teeth ff 134 → gear 36 → crankshaft 35 → gear 60 → teeth 1158 → gear 56 → gear 59.
The rotary flange pipe 3 is arranged in the torque transmission path between
It functions as a rotation speed variable mechanism for switching and setting the rotation speed of the crank shaft 35 between the same rotation speed and a different rotation speed from the rotation speed of the crankshaft 35.

Next, the gear 59 fixed to the rotating flange w37 meshes with the gear 15, and the gear 15 further meshes with the threaded tooth IL16 attached to one end of the spline shaft 17. The spline shaft 17 is rotatably mounted on the slider 12 by means of a bearing 22 (= J-shaped, and a rotary cutting blade 1 is mounted on the other end).
8 is fixed.

The slider 12 is attached to the base 3 by means of two rails 13.13.
A rack 1 is slidably attached to the rack 1 and meshes with a sector gear 11 connected to the other end of the connecting rod 9 on the side surface thereof.
4 is engraved, and a cutting blade holder 19 having a female blade 20 in which the rotary cutting blade 18 is sandwiched is fixed to the upper surface. Note that 21 is an id plate that guides the flat tube 1.

The embodiment of the present invention has this configuration, and its operation will be explained next.

The flat tube 1 is supplied from the tube manufacturing machine, and t51
When the movement starts to the right in the figure, the contact roller 2 in contact with the flat tube rotates, and accordingly, a pulse is generated in the analog-to-digital converter 3 and is supplied to the drive control means 4. In response to this, the drive control means 4 performs arithmetic processing using a memory and arithmetic circuit to generate control pulses, which are supplied to the pulse motor 30 so that the pulse motor 30 can obtain a predetermined cutting length. Drive is controlled by rotational speed.

As the pulse motor 30 rotates, the crankshaft 35 rotates via the gears 34 and 36. Furthermore, the crankshaft 35
As the rotating flange pipe 3 rotates, the rotating flange pipe 3
7 also rotates. During normal cutting, the setup motor 57 stops +t
: Since it is L, the crankshaft 35 and rotating flange pipe 3
7 continues to rotate at the same rotational speed. Therefore, since the internal gear 44 fixed to the rotating flange pipe 37 and the planetary gear 43 rotatably attached to the crankshaft 37 also rotate at the same rotational speed, the planetary gear 43 does not rotate around the pin 42 and becomes an internal gear. It revolves along the internal gear 44 while meshing with the internal gear 44. As a result, the eccentric pin 46 installed in the planetary gear 43 rotates while maintaining the preset eccentricity r. Then, the fan-shaped tooth [1111] swings, and the slider 12 moves to the rail 13.
3, it reciprocates as shown by arrows A and B.

On the other hand, the 1-lux of the pulse motor 30 is
7 to the spline shaft 17 via the gear 59, the gear 15, and the screw teeth 1116, and the spline shaft 17 rotates. During the forward stroke of the slider 12 (arrow A), when the slider 12 follows at the same speed as the moving speed of the flat tube 1, the flat tube 1 is cut by the rotary cutting blade 18.

Next, a case will be described in which the cutting length L of the flat tube 1 is changed.

When cutting is performed once during two reciprocations of the slider 12 as described in the conventional device, the slider tracking distance is determined by the following equation.

Slider following distance=(1-10 cutting distance)/4 Therefore, the amount of eccentricity of the eccentric pin 46 must be set so as to obtain the following distance determined by the above formula.

To do this, the setup motor 57 is driven for a short time and the shaft 54 is
Rotate. Then, the rotating flange that had been rotating at the same rotational speed as the crankshaft 35! 37 is changed, and a rotational speed difference occurs between the rotating flange pipe 37 and the crankshaft 35. As a result, the planetary gear 43 rotates around the pin 42, producing a differential angle θ as shown in FIG. The pitch circle diameter D1 of the planetary gear 43 and the pitch circle diameter of the internal gear 44. Since the ratio of is set to 1:2, as the differential angle θ occurs, the center O1 of the eccentric pin 46 implanted in the planetary gear 43 is displaced along a straight line trajectory in the original direction of the internal gear 44. do.

Therefore, the eccentric pin 46 moves linearly along the guide groove 47. After setting the predetermined eccentricity r1, the setup motor 57 is stopped. Then the crankshaft 35 and rotating flange again? ! '37 rotates at the same rotational speed, the planetary tooth 11143 stops rotating, and the newly set eccentricity r
1 and revolves along the internal gear 44. still,
The differential angle θ is set according to the cutting length by a control unit (not shown) that controls the setup motor 57,
Further, a signal representing the changed cutting length is inputted to the drive control means 4 from the control unit.

Next, the pulses supplied from the analog-to-digital converter 3 are processed by the drive control means 4, and the generated control pulses are supplied to the pulse motor 30. As a result, the pulse motor 30 cuts the flat tube 1 at the changed cutting length.
Rotation is started at a rotation speed that can cut the material, and the setup is completed.

(Effects of the Invention) As described above-1-, according to the present invention, when changing the cutting length of the object to be cut, the pulses generated by the analog-to-digital converter are automatically processed by the drive control means. The amount of eccentricity of the eccentric pin can be changed simply by rotating the pulse motor at a rotation speed corresponding to a predetermined cutting length and by making the rotation speed of the rotating flange pipe different from the rotation speed of the crankshaft using the variable rotation speed 1fl mechanism. With this configuration, it is possible to change the cutting length without stopping the tube manufacturing machine and high-speed cutting machine itself, which greatly improves equipment operation rate and eliminates defective tubes caused by tube manufacturing machine stoppages. This makes it possible to eliminate the occurrence of defects and reduce the defective rate, and furthermore, it becomes possible to increase the tube manufacturing speed.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view of main parts of this embodiment, Fig. 3 is an explanatory diagram showing the action of the NJu gear and the internal gear, Figs. 5 is a plan view and a front view showing a conventional device, and FIG. 6 is an enlarged view showing a rotary cutting blade used in the conventional device. 1... (object to be cut) flat tube 2...
Contact roller 3...Analog/digital converter
4... Drive control means 9... Connecting rod 12...
・Slider 18...Rotary cutting blade 31...Base 35...Crankshaft 37...Rotation 7 run tube 4
3... Planetary gear 44... Internal gear 46...
Eccentric pin 53...(rotation speed variable mechanism) operating gear device

Claims (1)

[Claims] A contact roller that rotates in frictional contact with an object to be cut;
It has an analog-to-digital converter that is connected to the contact roller and generates a number of pulses proportional to the moving speed of the object to be cut, a pulse motor that rotates in synchronization with the pulses, and an eccentric pin that can adjust the amount of eccentricity. It has a crank mechanism, a slider that is reciprocated along the object to be cut by the pulse motor via the crank mechanism, and a rotary cutting blade that is attached to the slider and rotated by the pulse motor via a speed change mechanism. , a high-speed cutting machine configured such that the slider follows the workpiece at the same speed as the workpiece, the workpiece is cut by the rotating cutting blade, and the following distance of the slider can be changed by adjusting the eccentricity of the eccentric pin, the base comprising: a rotating flange pipe rotatably attached to the
A crankshaft is rotatably inserted into the rotating flange tube, a planetary gear is rotatably attached to the upper surface of the crankshaft, and a planetary gear is fixed to the upper surface of the rotating flange tube and meshes with the planetary gear. An internal gear having a pitch circle diameter twice as large as the pitch circle diameter is disposed in a torque transmission path connecting the pulse motor and the rotating flange pipe, and the rotational speed of the rotating flange pipe is the same as the rotational speed of the crankshaft. and a variable rotational speed mechanism for switching between different rotational speeds, and a variable rotational speed mechanism that processes the pulses based on the cutting length of the object to be cut and drives the pulse motor at a rotational speed corresponding to the cutting length. A high-speed cutting machine, characterized in that the eccentric pin is installed on the upper surface of the planetary gear, and the center of the eccentric pin is placed on the pitch circle of the planetary gear.