JPH04336912A - End material machining method in bar cutting machine and end material machining device - Google Patents

Abstract

PURPOSE:To prevent the end material of a bar steel from entering a cutting position, and a defective product from being mixed with standard billets by stopping a movable blade near a lowering position immediately after cutting a standard billet adjacent to the end material. CONSTITUTION:A bar steel B is cut with a movable blade 43 into a standard billet having the length of l, according to a constant cycle. When the cutting of a standard billet adjacent to an end material (e) is detected by an edge detection means 45, the movable blade 43 is stopped near a lowering position immediately after completion of standard billet cutting. Consequently, the ingress of the end material (e) into a cutting position can be prevented via the stoppage of the movable blade 43. At the same time, a chute 13 for end material discharge is opened, and the end material (e) is properly discharged by the feed of a subsequent bar steel.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for processing end materials in a steel bar cutting machine. More specifically, a method for processing end materials in a steel bar cutting machine that reliably separates and discharges a regular billet, which is a good product that has been cut to a predetermined size, and end material, which is a defective product that occurs at the end of a steel bar material, and that process. Regarding equipment.

0002

[Prior Art] The material for relatively small forged parts among various mechanical parts is cut into billets of a predetermined length or weight using a shear cutting machine from a long metal bar with a round or square cross section. It is made by The long steel bars shipped from steel mills are roughly 5 to 6 meters long and have a standardized length of several tens of meters.
Each book is tied up and sold on the market. however,
Although these steel bars have been made to a standard length, when looking at individual steel bars within the same bundling unit, the length is several tens of millimeters.
There is some degree of dimensional error.

On the other hand, the cutting dimensions, that is, the dimensions required for each material, also differ for each material. Therefore, when a steel bar is cut into pieces of a predetermined size, end pieces smaller than the predetermined size are generated at the ends of the steel bar. This terminal material must be disposed of as a defective product.

[0004] Also, the end dimensions are constant (usually the diameter of the material).
If the length is shorter than , the material will not be restrained or fixed sufficiently during cutting. If the material is cut in this insufficiently restrained state, the cut surface will deteriorate and a weight error will occur in the billet adjacent to the terminal material. Therefore, in this case as well, it is necessary to treat it as a terminal material including a portion of a predetermined size, which may normally be a regular billet.

[0005] Conventionally, cut billets and end materials are discharged into discharge chutes each having its own branch chute. Each branching chute is selectively opened and closed by a common opening/closing door to prevent end materials from getting mixed into the regular billet. In other words, while cutting and discharging a fixed-length billet, the opening/closing door opens the branching chute for the fixed-length billet and closes the branching chute for the terminal material, but when the number of cut billets of the fixed-length billet reaches a predetermined number. At this time, the branch chute for fixed-length billets is closed and the branch chute for end materials is opened.

[0006] Incidentally, the cutting cycle time of a fixed-length billet, that is, the lifting/lowering cycle time of the movable blade, is extremely short (0.9 s) from the viewpoint of improving cutting efficiency.
ec degree). Furthermore, even after the cutting of one steel bar is completed, subsequent steel bars are sequentially supplied, and these are also cut in the extremely short cycle time as described above. For this reason, the opening/closing operation of the opening/closing door is also required to have responsiveness that matches the cutting cycle time.

[0007] However, the time it takes for the cut billets or terminal materials to reach the respective branch chutes varies depending on the falling condition, sliding condition, etc. Therefore, even if the operational response of the opening/closing door matches the cutting cycle, especially before and after discharging the end material, the end material may be discharged into the branch chute for fixed-length billets, or the fixed-length billet may not be used for the end material. In some cases, the regular billet and the terminal material were not separated reliably and were discharged, such as being discharged into a branch chute.

[0008] Such contamination of the end material into the regular billet can be prevented by lengthening the cutting cycle time. However, this would go against the requirement of improving cutting efficiency as described above.

[0009]

SUMMARY OF THE INVENTION The present invention has been made based on the above-mentioned technical background, and aims to achieve the following objects.

An object of the present invention is to reliably separate and discharge terminal material from a regular length billet without reducing cutting efficiency;
It is an object of the present invention to provide a terminal material processing method and an apparatus for the same, which prevents the contamination of defective products.

[0011]

[Means for Solving the Problems] In order to achieve the above-mentioned problems, the present invention takes the following measures.

The method includes a fixed blade and a movable blade that moves up and down between a raised position and a lowered position and cooperates with the fixed blade when lowering to cut the steel bar by shearing action. While being fed to the cutting position by a feeding device, this steel bar is cut into fixed-length billets with predetermined dimensions, and the cut fixed-length billets are opened by the opening/closing operation of the opening/closing door. Regarding the end material generated at the end of the steel bar by cutting it, the end material is discharged into the end material discharge chute which is opened by the opening/closing operation of the opening/closing door. Immediately after completion of cutting the fixed-length billet adjacent to the movable blade, stopping the movable blade near the lowered position;
After this stopped movable blade prevents the terminal material from entering the cutting position, the opening/closing door closes the discharge chute for the fixed-length billet, opens the discharge chute for the terminal material, and then opens the discharge chute for the terminal material. A steel bar cutting machine characterized in that, after returning the movable blade to a raised position, the feeding device supplies a subsequent steel bar to a cutting position, thereby discharging the terminal material to the terminal material discharge chute. This is a method for processing terminal materials.

[0013] The above method is realized by the following device. a fixed blade, a movable blade that moves up and down between a raised position and a lowered position, and cooperates with the fixed blade when lowered to cut the steel bar into a fixed-length billet having a predetermined size by a shearing action; A cutting machine having a feeding device for supplying the movable blade to a position, and a discharge chute provided with an opening/closing door and for discharging end materials generated at the ends of the fixed-length billet and the steel bar, respectively. A descending stroke detection means constantly detects the descending stroke and generates a detection signal, and the number of cuts to be made in the billet of fixed length is set, and this signal is input every time the descending stroke detection signal is generated to determine the number of cuts. When this count reaches the set number, the movable blade is stopped near the lowered position, the fixed-length billet discharge chute is closed by the opening/closing door, and the terminal material discharge chute is closed. This is a terminal material processing device in a steel bar cutting machine having a calculation control means for opening.

[0014] An end face detection means is provided in the supply path of the steel bar and detects a rear end face of the steel bar, and the arithmetic control means detects the remaining end face of the steel bar from the end face position detected by the end face detection means. It is more effective to calculate the length and also calculate and set the number of billets remaining to be cut to a fixed length from this remaining length.

[0015]

[Operation] The movable blade usually cuts steel bars into fixed-length billets in a fixed cutting cycle, but when cutting a fixed-length billet adjacent to the terminal material, it stops near the lowered position immediately after cutting is completed. By stopping the movable blade, the terminal material is prevented from entering the cutting position. On the other hand, the terminal material discharge chute is opened when the movable blade stops. Therefore, the terminal material discharged by the subsequent supply of steel bars is reliably discharged to the terminal material discharge chute which is in the open state.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows the entire cutting machine. The cutting machine main body 1 is a cutting machine that cuts a steel bar material (hereinafter referred to as bar material) by shearing action using a fixed blade and a movable blade.

The material storage table 3 is used to stock bar materials as workpieces. The feed roller device 2 installed along the material table 3 is a material supply device for receiving the bar material from the material table 3 and feeding it to the cutting machine main body 1. The outer diameter measuring device 4 is a known measuring device for measuring the cross-sectional area of the bar material.

The pinch roller 6 is a type of roller that is pinched from above and below in order to receive the bar material from the feed roller device 2 and send it to the cutting machine main body 1. The billet S cut by the cutting machine main body 1 is discharged and sent to a discharge chute 7. An opening/closing door 10 is provided in the path of the discharge chute 7.

The discharge chute 7 is branched into a discharge chute 15 for fixed-length billets and a discharge chute 13 for end materials on the downstream side of the opening/closing door 10. The opening/closing door 10 selectively opens and closes the chutes 13 and 15, and when the chute 15 is open, the regular-sized billets S are stored on the non-defective pallet 20. Further, when the opening/closing door 10 opens the chute 13, the end materials are stored in the scrap pallet 14.

Each of the chutes 13 and 15 is provided with passage detection sensors 21 and 22, which are comprised of, for example, a transmission type photoelectric switch, for detecting the passage of the fixed-length billet and the terminal material.

FIG. 2 shows details of the cutting machine main body 1. As shown in FIG. A ram 33 is pivotally supported on the frame 31 via a king pin 32 so as to be swingable in the vertical direction. Further, one end of a lever 34 is connected to the king pin 32, and a crank 35 is connected to the other end of the lever 34. crank 35
is connected to the eccentric position of the large gear 36, so that when the large gear 36 rotates 360 degrees, the ram 33 reciprocates between the top dead center, which is the raised position, and the bottom dead center, which is the lowered position.

The large gear 36 meshes with a pinion 38 via a loose gear 37, and the shaft 38a of this pinion 38 is connected to a drive motor 40 via a pulley and belt 39 (not shown).
is connected to. The operation of this drive motor 40 causes the large gear 36 to rotate. The drive transmission shaft 38a provided with the pinion 38 is provided with a clutch and a brake (not shown) each actuated by air pressure. The operation of these clutches and brakes is controlled by respective electromagnetic switching valves provided in a pneumatic circuit (not shown). By switching the electromagnetic switching valve, the clutch and brake are activated or deactivated. Further, the drive transmission shaft 38a is provided with a flywheel 41 for storing rotational energy.

A movable blade (numeral 43 in FIG. 3) is provided at the tip of the ram 33.
) is attached, and a fixed blade (see reference numeral 42 in the figure) is mounted on the frame 31 below it. As the ram 33 moves up and down between the top dead center and the bottom dead center, the movable blade 43 moves up and down, and the bar material is cut by shearing action.

FIG. 3 shows means for detecting the end face of the bar material. A stopper 44 that is movable in the direction in which the bar material is fed is provided in front of a cylindrical fixed blade 42 that restrains the bar material during cutting. By adjusting this stopper 44,
The bar material B is cut into regular billets having a predetermined size l.

The end face detection means 45 is provided in the bar material B supply line. In this embodiment, the end face detection means 45 includes a plurality of light emitters G1 to Gn and light receivers K1 to Kn, respectively, on a pair of substrates 46 and 47 facing each other with an interval.
It is made by arranging. The rear end surface of the bar material is the substrate 46
, 47, the rear end surface of the bar material B is detected by the light transmitter/receiver in the front row through which the light passes. On the other hand, the distance T between the tip surface of the fixed blade 42 and the rearmost light emitter/receiver is set in advance.

Therefore, by subtracting the sum of the array spacing α of the transmitters and receivers through which light has passed from the distance T (in the illustrated example, T-3α), the distance from the tip surface of the fixed blade 42 to the rear end surface of the bar material B can be calculated. A dimension L' is calculated. Then, the remaining length L is calculated by adding to the dimension L' the size l (L) of the regular billet to be cut between the stopper 44 and the fixed blade 42. Furthermore, this remaining length L is the dimension l (L)
By dividing by , the remaining number of regular-sized billets and the length of the terminal material e are calculated. Such an end face detection means 45 itself has already been made publicly known by the applicant, and its details are described in Japanese Patent Publication No. 64-9125. FIG. 4 is a functional block diagram for controlling the operation of the movable blade.

Limit switches LS1, LS2, and LS3 are provided at predetermined rotation angle positions of the large gear 36. The limit switch LS1 is a ram 33, that is, a movable blade 4.
This is to detect the descending stroke of the large gear 36.
Rotation angle range from 5° to 135° (90° in this example)
location). The limit switch LS2 is used to detect the clutch disengagement position of the clutch provided on the drive transmission shaft 38a and determine the clutch disengagement timing. In the example, it is installed at a position of 220°). The limit switch LS3 is used to detect the brake-on position of the brake provided on the drive transmission shaft 38a and determine the timing of the brake operation. In the example 2
90° position). These limit switches LS1, LS2, and LS3 output signals for each rotation of the large gear 36, that is, for each round trip between the top dead center and the bottom dead center of the movable blade 43, and these signals are input to the programmable controller 50. Ru.

The programmable controller 50 is a controller for sequence control, and can change the sequence by freely changing the program. The programmable controller 50 is controlled by the operation panel 51.
It is provided with push buttons, lamps, etc. for setting parameters necessary to control the cutting machine body 1 and operating the cutting machine body 1. The programmable controller 50 controls the operation of a clutch 54 and a brake 57 provided in the cutting machine body 1 according to a preprogrammed procedure. The control is such that pressurized air from an air pressure source 53 is transferred to a programmable controller 5.
This is done by switching the electromagnetic switching valves 52 and 53 using an output signal of 0.

When the clutch 54 is supplied with pressurized air from the air pressure source 53, a spring (not shown) inside the clutch 54 is activated.
The clutch plate 55 is moved against the force to drive the crankshaft. When the crankshaft is rotated, the ram is moved up and down. When the electromagnetic switching valve 52 is switched to cut off the supply of pressurized air, the clutch plate 55 returns to its original state by the force of the spring, cutting off the power and stopping the rotation of the crankshaft.

On the other hand, the brake 57 is for stopping the rotation of the crankshaft. A spring (not shown) constantly presses the brake plate 58 to keep the brake in operation. When the electromagnetic switching valve 56 is switched in response to a command from the programmable controller 50 and pressurized air from the pressure air source 53 is supplied into the brake 57, the brake plate 58
moves against the spring and is released. This brake plate 5
8, the crankshaft is in a state where it can freely rotate.

The microcomputer 60 is for calculating and setting the remaining number of uncut standard-sized billets.
It has a subtraction counter in its memory that subtracts the number of cut length billets from the set number. That is, the detection signal of the end face detection means 45 is transmitted to the programmable controller 5.
If 0 is input, the microcomputer 60 calculates the remaining length L of the bar material from the end face position of the bar material, and from this remaining length L, calculates and sets the remaining number of standard length billets. After setting the remaining number, the microcomputer 60 counts the downward stroke detection signal input to the programmable controller 60 as the number of cut length billets, and subtracts it from the set number.

Operation FIG. 5 shows a time chart of the operation of the programmable controller 50 and the microcomputer 60, and a corresponding ram stroke diagram. FIG. 6 is a drawing similar to FIG. 5 when the movable blade is stopped at the bottom dead center. FIG. 7 is a flowchart of the cutting cycle of the movable blade and the bottom dead center stopping operation.

When the power is turned on by operating the disconnection operation push button at the start of operation (step S1 in FIG. 7), the brake 5
7, the solenoid of the electromagnetic switching valve 56 is turned ON and the brake 58 is released (step S2 in FIGS. 5 and 7).
), 0.2 to 0.3 seconds later, the solenoid of the electromagnetic switching valve 52 is turned on to activate the clutch 54, and the clutch 54 is engaged (0° position in Fig. 5, step S3 in Fig. 7).
).

As a result, the ram 33, that is, the movable blade 43 is lowered (step S4 in FIG. 7). When the movable blade 43 is lowered, the limit switch LS1 is turned on and the lowering stroke is detected (90° position in Fig. 5, step S5 in Fig. 7).
, 0.1 sec later, the programmable controller 5
0 commands the microcomputer 60 to measure the remaining length of the bar material and also commands calculation. However, if the end face detection means 45 does not output a signal, the remaining length will not be measured.
Calculations by the microcomputer 60 are also not executed. Note that the total number of cuts, that is, the number of normal billets, is counted by the downward stroke detection signal.

Next, the microcomputer 60 determines whether or not the bottom dead center has stopped (step S6 in the figure).
), if the length of the bar material has not been measured, the remaining number is not set and no countdown is performed, so the movable blade 43 passes the bottom dead center (200° position in FIG. 5) (step S7 in FIG. 7). The movable blade further rises and the limit switch L
When S2 is turned on and the clutch disengaged position is detected (220° position in FIG. 5, step S8 in FIG. 7), the programmable controller 50 turns off the clutch-on solenoid, switches with the electromagnetic switching valve 52, and closes the clutch 54. Let it open.

When the clutch 54 is released, the power to the ram, that is, the movable blade is cut off, but it moves slightly due to inertia. However, when the limit switch LS3 is turned on and the angular position for operating the brake 57 is detected (29 in FIG.
At the 0° position (step S9 in FIG. 7), the programmable controller 50 turns off the brake cut-off solenoid, that is, switches the electromagnetic switching valve 56 to operate the brake 57. This causes the ram, that is, the movable blade, to stop at the top dead center (360° position in Figure 5, step S10 in Figure 7)
. Note that the reason why the movable blade 43 is stopped at the top dead center is to confirm that the tip of the bar material enters the cutting position, and is not directly related to the end material processing operation of the present invention.

At this time, the opening/closing door 10 opens the discharge chute 15, and the cut billet S of a fixed size passes through the discharge chute 15 and is stored on the good product pallet 20. After the brake 57 is activated, a timer built into the programmable controller 50 measures a certain period of time (step S11 in FIG. 7), and when a sensor (not shown) provided on the stopper 44 detects the entry of the bar material, the brake 57 is activated again. It is opened (step S2 in FIG. 7). Thereafter, steps S2 to S11 similar to those described above are repeated, and the bar material is cut into regular-length billets having a predetermined size l.

After cutting a plurality of regular length billets, when the rear end face of the bar material becomes detectable, the end face detection means 45 outputs a signal. When the end face detection means 45 enters the output state, the microcomputer 60
After limit switch LS1 detects the downward stroke (
After 0.1 sec), the remaining length L of the bar material is calculated by the remaining length measurement command from the programmable controller 50, the number N of remaining cut length billets is calculated from the remaining length L, and the value is set in the memory.

Even after setting the remaining number N, steps S2 to S1
1 is executed repeatedly. During the execution of steps S2 to S11, when the limit switch LS1 detects a downward stroke (90° position in FIG. 5), the microcomputer 60 uses a count command from the controller 50 to store in the memory the number of cut length billets after setting the remaining number. Count down from inside and judge whether it has stopped at bottom dead center (from 90° in Figure 5)
270° angular range, step S6 in FIG. 7). As a result, if the countdown number N is 2 or more, step S2 ~
S11 is executed.

Then, when the countdown number N reaches 1 in step S6 of FIG. 7, that is, when the last cutting of normal material occurs, the microcomputer 53 sets
1 signal (270° position in Fig. 5), and prepares to stop at the bottom dead center in the next cutting cycle (step S12 in Fig. 7).
). That is, in the next cutting cycle, when limit switch LS1 is turned ON and a downward stroke is detected (9 in FIG.
0° position, step S13 in FIG.
F to open the clutch 52, and at the same time turn off the brake cut-off solenoid to operate the brake 51 (Fig. 6
130° position, step S14 in FIG. 7). As a result, the movable blade 43 stops at the bottom dead center after cutting the last fixed length billet adjacent to the terminal material (200° position in FIG. 6,
Step S15 in FIG. 7).

By stopping the movable blade at the bottom dead center, the end material is prevented from entering the cutting position by the movable blade, and the end processing operation is performed (step S16 in FIG. 7). That is,
In the final cutting cycle, when a downward stroke is detected by turning on the limit switch LS1 (90° position in FIG. 6, step S13 in FIG. 7), a timer built into the programmable controller 50 is activated (step S01 in FIG. 7). ). As a result, a preset timer measures a certain period of time (t1). If the sensor 22 installed in the discharge chute 15 detects the discharge of the fixed-length billet adjacent to the terminal material within this time (step S0 in FIG.
2) The programmable controller 50 operates the opening/closing door 10 to open the discharge chute 13. If the sensor 22 does not detect it within this certain period of time, it is determined that there is an abnormality and the cutting machine is stopped.

[0042] Furthermore, the timer operates for a certain period of time t2 (t2
>t1) and when the stopper 44 is moved back a predetermined distance by the N=0 signal from the microcomputer 60,
The brake cut-off solenoid is turned on and the brake 57 is released, and the clutch-on solenoid is turned on and the clutch 54 is activated (200° position in FIG. 6, step S17 in FIG. 7), and the movable blade starts to rise ( Step S in Figure 7
18).

After the movable blade is raised, step S8 in FIG.
The following will be executed: At the time of top dead center stop in step S10, the subsequent bar material is supplied, and the end material of the preceding bar material is thereby discharged to the discharge chute 13. After a certain period of time has elapsed, the programmable controller 50 outputs an automatic start command signal, steps S2 to S11 are executed, and the subsequent bar material is cut into regular-sized billets. In addition, in FIG. 6, the cutting cycle of the subsequent bar material is shown compressed in the angular displacement direction for convenience.

[0044] A timer measures the opening/closing door 10 for a certain period of time,
When the sensor 21 provided on the discharge chute 13 detects the end material, the discharge chute 13 is closed. Depending on the user's request, the tip material may also be discarded as a defective product, but in this case, when the sensor 13 detects the tip material, the discharge chute 13 will be closed.

[Modification] In the above embodiment, after the end face detection means detects the bar material, the microcomputer 60 calculates and sets the number of remaining bar materials. However, if the dimensional error of the bar material is small and can be considered to be approximately constant, the number of cuts may be set in advance before cutting the bar material, and the number of cuts may be counted down from the start of cutting.

[0046]

As described in detail above, according to the present invention, the movable blade is stopped near the lowered position immediately after cutting the fixed-length billet adjacent to the terminal material, thereby preventing the terminal material from entering the cutting position. and then open the terminal material discharge chute,
The end material is reliably discharged to a dedicated discharge chute, thus preventing defective products from being mixed into the regular billet.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing the entire steel bar cutting machine.

FIG. 2 is a sectional view showing details of the cutting machine main body.

FIG. 3 is a front view showing end face detection means of a bar material.

FIG. 4 is a functional block diagram for controlling the operation of the movable blade.

FIG. 5 is a diagram showing a time chart of operations of a programmable controller and a microcomputer, and a corresponding ram stroke.

FIG. 6 is a drawing similar to FIG. 5 when the movable blade is stopped at the bottom dead center.

FIG. 7 is a flowchart of the cutting cycle and bottom dead center stop operation of the movable blade.

[Explanation of symbols]

Claims (3)

[Claims] 1. A feeding device comprising a fixed blade and a movable blade that moves up and down between a raised position and a lowered position, and cooperates with the fixed blade to cut the steel bar by shearing action when lowered, and that cuts the steel bar by shearing action. This steel bar is cut into fixed-length billets with predetermined dimensions while being fed to the cutting position by the cut-off door. Regarding the end material that is discharged into a chute and generated at the end of the steel bar by cutting, the cutting machine discharges the end material into the end material discharge chute that is opened by the opening/closing operation of the opening/closing door, and the end material is adjacent to the end material. Immediately after the cutting of the fixed-length billet is completed, the movable blade is stopped near the lowered position, and the stopped movable blade prevents the end material from entering the cutting position. After closing the billet discharge chute and opening the terminal material discharge chute, and then returning the movable blade to the raised position, the feeding device feeds the subsequent steel bar to the cutting position, thereby A method for processing end material in a steel bar cutting machine, characterized in that the end material is discharged into the end material discharge chute. 2. A fixed blade, and a movable blade that moves up and down between a raised position and a lowered position, and cooperates with the fixed blade when lowered to cut a steel bar into a fixed-length billet with a predetermined size by shearing action; A cutting machine having a feeding device for feeding the steel bar to a cutting position, and a discharge chute provided with an opening/closing door and for discharging the fixed-length billet and the end material generated at the ends of the steel bar, respectively. , a descending stroke detection means that constantly detects the descending stroke of the movable blade and generates a detection signal, and a number of cuts to be made in the fixed-length billet is set;
Each time the descending stroke detection signal is generated, this signal is input and counted as the number of cuts, and when this count reaches the set number, the movable blade is stopped near the descending position, and the opening/closing door is used to cut the movable blade. What is claimed is: 1. A terminal material processing device for a steel bar cutting machine, comprising arithmetic and control means for closing a discharge chute for fixed-length billets and opening the discharge chute for terminal materials. 3. In claim 2, the steel bar has an end face detecting means provided in the supply path of the steel bar to detect a rear end face of the steel bar, and the arithmetic control means detects the end face detected by the end face detecting means. A terminal material processing device for a steel bar cutting machine, characterized in that the remaining length of the steel bar is calculated from the position, and the number of remaining cut length billets is calculated and set from this remaining length.