JPS5964218A - Control method for conveyance table for rod material cutting machine - Google Patents

Abstract

PURPOSE:To improve precision of cutting, yield rate and the like and further productivity by controlling front and rear conveyance tables for a rod material cutting machine from a rated speed to the vicinity of zero via plural steps of deceleration control. CONSTITUTION:The speed control first step detection oscillator 10, a like receiver 11 and the second step detection oscillator 12, a like receiver 13 of front, rear face conveyance tables of a cutting machine which detects passage of the tip of material to be cut and sends out an operation signal, are provided on both sides of a cutting machine rear face conveyance table 5 at predetermined intervals on this side of a definite dimensional positioning stopper 9. Rated speed of front, rear face conveyance tables 4, 5 is gradually controlled for deceleration through the plural number of stages.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the speed of the front and rear conveyance tables for a bar cutting machine when dividing a large number of straight bars into fixed lengths and trimming the leading and trailing ends thereof. It is.

Conventionally, in this type of group-feed straight bar cutting line table, as shown in Fig. 7, on the bar cutting machine,
Bar material cutting machine body (1) equipped with lower cutters (2a) and (3a)
The conveyance speed control of the front and rear conveyance tables (4a) and (5a) for the cutting machine consisting of driven rollers <68)-('7a) in a) is carried out at one location on the rear conveyance table (5a) side. Detected by bar passage detector (LOA) (LOB),
As shown in Figure 1θ, deceleration from rated speed (a)' to (b)'
Since a single deceleration method was adopted, as the rated conveyance speed was increased, the control of the braking stop position was extremely slow.

In addition, the standard size material position I ambiguous size determination stopper (9
Not only is there a high possibility of applying an excessive impact force to a), but it also causes unevenness due to collision and rebound of the tip of the bar, which is the most undesirable for cutting work, and the length accuracy within a group (dimension 2' in the figure) ), and also affected the yield and productivity of the product.

The present invention avoids these disadvantages by controlling the conveyance speed of the material to be cut in multiple stages.

In other words, by controlling the 14tl rear conveyance table for the rod cutting machine from the rated speed to near zero through multiple stages of deceleration control, the collision force against the sizing stopper for the sizing material is made slight, We aim to improve cutting accuracy, product yield, and quality by eliminating bouncing of the tip of the bar material, and also aim to improve productivity through high-speed conveyance, 1-position alignment, and high-efficiency processing. This is the purpose.

The method of the present invention will be explained below with reference to the drawings.

Straight bar cutting + (R device # is a straight bar cutting machine body (1) consisting of a cutter blade (3) and a cutting machine upper knife (2) that can be moved up and down, and is installed on the front and rear surfaces of the straight bar cutting machine body (1). The cutter 1 consists of an arrangement of 6 groups of 7-tars that convey the material to be cut.
Analysis 1 The cutting machine is composed of a front conveyance table 141 and a rear conveyance table (5) consisting of a similar array of motorized rollers (7).

The first method for cutting straight bars by group-feeding a large number of bars is
As shown in Figures to Figure 3, first, the cutting machine is placed in parallel on the front conveyor table basket 4) and is driven by each motor (11) and a group of rollers (6) rotated by the drive chain α force. They were conveyed simultaneously, and the tip of the straight bar 041 was stopped in a state beyond the cutting position iff of the bar cutting machine, and the portions of the tip of the straight bar that were defective in terms of size, shape, or quality were removed. On top of the bar cutting machine, cut using the knife [21+f3+] and cut off the tip of the straight bar with a loft cut (cut off 1G).

Next, the straight bar material t14) with its tip cut is attached to the drive chain U, the tip rollers interlocked with the A chain, and each motor.
On, approach to the rear of the cutting machine by driving rotation of the rollers (6) and (7) with (to), tilting cheeple (8)
After that, MtT, rear loading table +41. (The fixed size positioning stopper is conveyed in the direction of the arrow on the rear conveyance table (5) and is provided vertically and retractably so as to stand by at a distance corresponding to the fixed length cutting length from the cutting point.
9), and the bar stops in the state shown in Figures Q and S. In the present invention, when controlling the process of conveying the bar material at this distance of (4:3), The speed of the front and rear conveyance tables of the cutting machine is set at a predetermined interval before the positioning stopper (9), and the speed of the front and rear conveyance tables of the cutting machine is set on both sides of the conveyance table (5) on the rear side of the cutting machine. The first stage control detection transmission 'aaυ and the same receiver un,
Fixed size positioning d) Front and rear conveyor table speed control of the same cutting machine as described above in sequence near the stopper (9) side First stage detection transmitter (to) and receiver α3 are arranged in multiple stages After installation, the rated speeds of the front and rear conveyance tables (4) 2 (5) are controlled to be gradually decelerated in multiple stages. To explain this with reference to Fig. 2, after crop-cutting the tip of the straight bar, the table conveyance speed of the front and rear conveyance tables (4) and (5) is set to the rated speed (a). The carry-out table is conveyed to the control command transmission point of speed control detection transmitter α0 and receiver αD, and this transmitter and receiver Ua-
U detects the tip of the bar and simultaneously issues the first stage deceleration command.

In response to this deceleration command signal, the front and rear transport tables +41
, (5) each motorized roller (6), (7) motor (1!1-(aj) is the number of rotations rr, and the table conveyance speed is first decelerated (b) to the deceleration setting value. Conveys straight bars.

Next, the straight bar is fed at the control command transmission point 1 of the cutter's iil, rear conveyance table speed control detection transmitter, receiver @, ([3). (The number of deceleration control stages is set according to the rated speed of the table. It is okay to decelerate in the moving stage at the final speed of zero.) In this final stage, ill, the rear conveyance table speed control detection transmitter, receivers U2 and C10 detect the old tip of the rod and at the same time send a control signal. It acts on the rotation pulses of the roller motors + ILJ and (to) of the front and rear conveyance tables (4) and (5) until the conveyance speed becomes near zero, and the motor gradually rotates. The first deceleration tc is set so that the table conveyance speed is lost when the tip of the bar reaches the point of the sizing positioning stopper (9) of the sizing material.
) L, fixed size positioning stopper (9) to minimize the impact force of the straight bar material and ensure the specified length e) vJ fixed size. At the same time, the main body of the bar cutting machine (1
On top of this, the blades fIJ+21 and 131 operate to cut the straight bar material fL41 into a fixed length, and as shown in FIG. 5) Roller
At the same time as the paper is fed out by a drive, the front conveyance table roller is also moved, and after cutting, short length measurement and cutting are repeatedly performed from V again in the same manner as described above.

As described above, according to the method of the present invention that controls the conveyance speed of the table for a bar cutting machine in multiple stages, it is possible to prevent disturbances in the tip alignment during sizing even when cutting straight bars in groups of 100 mm. It is possible to measure sizing with high precision without any problems. Also,
By increasing the number of deceleration stages even if the speed of the conveyor tape is set as high as possible, it is possible to easily and accurately stop the straight bar at a predetermined position, leading to improved cutting efficiency and cutting efficiency. In addition to improving product yield, this also contributes to productivity.

Figure 2 is a plan view of the plane conveyance table, and Figure 2 is a plane view in the direction of the cutting line in Figure 1, showing the state before cutting of the tip of the straight bar during cutting. Figure q is a cross-sectional view taken in the direction of the cutting line when the tip of the straight bar is cut from the straight bar. Figure q is a cross-sectional view showing the state before cutting when cutting the straight bar to a fixed length, and Figure 5 is a cross-sectional view showing the conveying state after cutting the straight bar to a fixed length. 7 is a plan view of the rear conveyance table of a conventional bar cutting machine, FIG. 7 is a cross-sectional view in the direction of the cutting line in FIG. The first diagram shows the speed control diagram of the front and rear conveyance lapels.
The θ diagram shows a speed control diagram of the front and rear conveyance tables of the conventional cutting line.

(1)...Main body of the bar material cutting machine, (2)...Cut Wr machine upper cutter, (,31...Cutter cutter, (4)...Cutting machine front conveyance table, (5)...Cutting machine Rear conveyance table, (6
), (c...Roller with motor, (9)...Size positioning stopper, 00.02...Front and rear conveyance tape l
Speed control station 1 detection transmitter, 0, u3...Same receiver + 1
141... Straight bar, (a)... Rated speed, (b)... Primary reduction, (C)... Secondary or final reduction.

Applicant: Nakayama Steel Works Co., Ltd. Figure 7 te Figure 1o

Claims (1)

[Claims] / In the bar cutting machine FIT, which transports a large number of straight bars by the front and rear conveyor tables of the roller drive type on the rear and cuts a large number of straight bars at the same time into fixed lengths and trims the leading and trailing ends to align them. After crop-cutting the tip of the straight bar, the straight bar is conveyed at the rated speed of the front and rear conveying chifurs, and at the same time the straight bar is conveyed on both sides of the table in front of the fixed size positioning tool provided on the rear conveyance table. Before detecting the passing of the tip of the bar and issuing an activation signal, the rear conveyance table speed control detection transmitter and the same receiver B1 are installed at multiple stages at intervals, and the conveyance speed of the front and rear conveyance tables is gradually changed to multiple stages. A method for controlling a conveying table for a bar cutting machine, characterized by slowing down and controlling the table conveying speed to near zero when the tip of the straight bar reaches a fixed size positioning stopper.