JPS59102518A - Saw blade feed control device in saw cutter - Google Patents

Abstract

PURPOSE:To carry out the highly accurate control of blade feed in accordance with various pipe-cut specification without the necessity of selecting and preparing a large amount of record tape or the like by an operator, by providing such an arrangement that the specification of a pipe to be cut is directly inputted and computed. CONSTITUTION:In a saw cutter, a blade feed cylinder 7 is raised by controlling the speed of a hydraulic drive unit with the use of a blade feed control device. Further, the raised position of the cylinder 7 is detected by a blade feed detecting counter 14. In view of the specification of pipe-cut which is set by a specification setting units such as, for example, a pipe wall thickness setting unit 21, a pipe outer diameter setting unit 22, a pipe number setting unit 23, etc., a pipe-cut length at each blade feed is computed by a pipe cut-length computing circuit 20, and is stored in a pipe-cut length storing memory 19 at each blade feed. Thus, the highly accurate control of blade feed may be carried out in accordance with various specifications without the necessity of selecting and preparing a large amount of record tape, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blade feed control device for a circular saw type cold saw used for cold cutting steel materials, pipe materials, etc.

Conventionally, this type of device simply feeds the blade at a constant blade feed speed, or a card or tape that stores the value of the single-tooth depth of cut at each blade feed position is prepared in advance for each pipe specification. In some cases, when cutting, the operator reads a card or tape suitable for the specifications of the material to be cut into a control device to control the blade feed.

FIG. 1 is a block diagram of a blade feed control device of the latter type.

Further, FIG. 2 is a graph diagram showing the relationship between the one-tooth cutting rate and the blade feed position stored on the tape.

In FIG. 1, a material to be cut q (pipe material in the figure) is fixed by a horizontal rung device S and a vertical ramp device B.

The motor 1 is driven by the reduction gear unit 3 and has a low speed and high torque to drive the saw blade. The rotating saw blade, motor, and speed reducer unit 3 are pushed up by the direction feed cylinder 7 to cut the pipe. The direction feed cylinder 7 is pushed up by controlling the speed of the direction feed speed control device 9 (hydraulic servo valve, etc.) using hydraulic power from a hydraulic pump lθ. The push-up position of the direction feed cylinder 7 is measured by a direction feed position detection counter /l based on a signal from the pulse transmitter g. The direction feed speed standard is determined by the product of the direction feed speed setter 13 and the one-tooth depth of cut rate read out by the one-tooth depth of cut rate reading circuit/S, and the direction feed speed calculation circuit 12 performs the calculation. . The output of the direction feed speed calculation circuit/2 is given to the direction feed speed output circuit 7, and a control signal is given from this circuit 1/ to the aforementioned control device.

For the single-tooth cutting rate, pre-measured and calculated data is recorded on a recording card or tape 17 for each specification of the material to be cut, and the data set with the pipe specification setting device is ) is read by the readout circuit 16. The data of the one-tooth cutting rate read out by the readout circuit 16 is as shown in FIG. This-
The change in the tooth cutting rate is inversely proportional to the pipe cutting length, and is limited to a certain amount of cutting or less, and - the volume of chips cut by the teeth is limited to a certain value or less.

Since conventional direction feed control devices are configured as described above, they can only control pipe specifications that have been measured, calculated, and recorded on tape in advance, and in order to satisfy all pipe specifications, a large amount of Data had to be recorded on tape. Further, the directional feed speed had to be calculated and set by the operator based on the saw tooth pitch, saw blade circumferential speed, and the like.

This invention was made to eliminate the drawbacks of the conventional products as described above, and allows selection and setting of pipe specifications (outer diameter value, wall thickness, number of pieces) and saw blade specifications (saw tooth pitch, saw blade circumferential speed). death,
It is an object of the present invention to provide a direction feed control device for a saw cutting machine that does not require operator judgment or large amounts of data recording by calculating the direction feed speed from data of these specifications.

is fixed by a horizontal clamp device and a vertical wrap device 6. The motor l is driven at low speed by the reducer unit 3.
It generates high torque and drives the saw blade.

The rotating saw blade, motor 1, and speed reducer unit 3 are pushed up by the direction feed cylinder 7 to cut the pipe. The direction feed cylinder 7 is a direction feed speed control device that controls the hydraulic power from the hydraulic pump 10. The speed is controlled by (hydraulic servo pulp, etc.) and it is pushed up.

The push-up position of the direction feed cylinder 7 is detected by the direction feed position detection counter /f by the pulse generator g.

Pipe wall thickness setting device? According to the pipe specifications set by the specification setting devices such as the pipe outer diameter setting device 22 and the pipe number setting device 23, the pipe cutting length for each direction feeding position is determined by the pipe cutting length calculation circuit 2o, The pipe cutting length is stored in the pipe cutting length storage circuit 19 for each feeding position. Based on the direction feed position detected by the direction feed position detection counter /4 (), the pipe cutting length stored in the storage circuit /? is read out by the pipe cutting length reading circuit 21I.Selected by the saw blade selection switch 5 The tooth pitch of the saw blade thus determined is read out by the saw tooth pitch selection circuit KORO, and is sent to the negative tooth cutting feed amount calculation circuit 7 and the direction feed rate calculation circuit 12.

- The tooth cutting amount calculation circuit 27 is for calculating the one tooth cutting amount based on the pipe cutting length from the two circuits and the sawtooth pitch from the circuit 26. The direction feed speed calculation circuit 12 calculates the direction feed speed based on the one-tooth cutting amount from the circuit 27, the sawtooth pitch from the circuit 2B, and the saw blade circumferential speed set by the saw blade circumferential speed setting device 2g. The direction feed speed signal calculated by the direction feed speed calculation circuit I is converted into an input signal of the direction feed speed control device W by the direction feed speed output circuit //.

In the above configuration, the specification setting device), /, 2.2
.

Based on the pipe specifications set in 2J, the pipe cutting length calculation circuit θ calculates the pipe cutting length at each feed position and stores it in the storage circuit 19. The calculation result of the pipe cutting length is shown in FIG. 7, for example. In FIG. 4, the horizontal axis represents the feed amount of the pregnant feed cylinder, and the vertical axis represents the pipe cutting length at the feeding position. The output of the blade feed position detection circuit/g is S (mr
), the pipe cutting length reading circuit 2Q reads out the pipe cutting length L (mid) at that position.

Next, in the one-tooth cutting amount calculation circuit 27, the one-tooth cutting amount C (m/
T) is calculated by the following formula, Q=Kt-P' Q (md): P (m) Pitch of saw blade - tooth pocket area Kl: Relationship constant with pitch depending on tooth pocket shape L Amount of cutting chips relative to pitch However, there is a limit to the ratio of tooth cutting depth, for example, θθ
It is limited to 5≦C≦θ17. This limited range varies depending on the structure of the saw blade, specifications of the material to be cut, machine structure, etc. Figure S shows an example of the calculation results. The determined one-tooth cutting depth C(n
Shoulder/1) is determined by the blade feed speed calculation circuit saw.

The blade feed speed X obtained from the above relational expression is converted into a signal level to the blade feed speed control device D by the blade feed speed output circuit //, and the blade feed speed is controlled by this blade feed speed control device D. be done. The blade feed position is measured by the blade feed position detection circuit/da using the pulse signal from the pulse transmitter g, the pipe cutting length reading circuit 2q reads the pipe cutting length at the next blade feed position, and the blade feed speed is determined in the same way. controlled.

In addition, in the above example, the case of pipe cutting was shown, but
Pipe cutting length calculation circuit 2θ suitable for steel materials such as round bars and shaped steel
The same effect can be achieved by changing the arithmetic expression in

Further, in the above embodiment, the hydraulic mechanism 10. ? Although the blade feed drive is controlled by the combination of and 7, the same effect can be achieved by using another drive system such as a motor as long as the blade feed speed can be controlled. Furthermore, a pulse transmitter g is used as a blade feed position detector, but a magnetic scale,
A similar effect can be obtained by using a position detection system such as a differential transformer.

As described above, the present invention allows calculations to be made by directly inputting the specifications of the pipe to be cut, so that the operator does not have to select and prepare a large number of recording tapes, etc., and can perform calculations for any specification. Highly accurate blade feed control can be obtained. In addition, since highly accurate blade feed control can be obtained, the life of the saw blade, which is subject to excessive cutting force, can be extended, and the cutting time can be shortened. .

[Brief explanation of drawings]

FIG. 7 is a block diagram showing a case where a conventional blade feed control device is used to cut a pipe, and FIG. 2 shows an example of changes in the one-tooth cutting rate to explain the operation shown in FIG. 1. A graph diagram, FIG. 3 is a block configuration diagram showing a blade feed control device according to an embodiment of the present invention, and FIG. 4 shows a change in the calculation result of the pipe cutting length to explain the operation of FIG. A graph 119 and FIG. S showing an example of this are graphs showing an example of a change in the calculation result of the depth of cut per tooth to explain the operation shown in FIG. 3. In the figure, C is the saw blade, q is the pipe to be cut, 7 is the blade feed cylinder, D is the blade feed end control device, // is the blade feed speed output circuit, /2 is the blade feed speed calculation circuit, and l is the blade. Feed position detection circuit, 2/, 2 and 3 are specification setting devices, /9 is a cutting length storage circuit, 20 is a cutting length calculation circuit, 2g is a cutting length reading circuit, 2 is a saw blade selection switch, 2B is a sawtooth pitch selection circuit, 27 is a single tooth cutting amount determining circuit, 2g
is the saw blade circumferential speed setting device. Agent Shin Kuzuno −

Claims (1)

[Claims] A cutting length calculation circuit that calculates the length of the cut surface at each constant blade feed position by inputting the specifications of the material to be cut individually;
a cutting length storage circuit that stores a signal representing the cutting length for each blade feed position calculated by the cutting length calculation circuit; a cutting length readout circuit that reads out the actual blade feed length of the saw cutting machine from the storage circuit; A single-tooth cutting depth calculation circuit receives a signal representing the cutting length and a signal representing the sawtooth pitch from the cutting length readout circuit, and calculates the cutting depth per tooth from these signals, and the calculated one-tooth A blade feed speed calculation circuit receives a signal representing the depth of cut, a signal representing the sawtooth pitch, and a signal representing the saw blade circumferential speed value, and calculates the blade feed speed from these signals, and the blade feed speed value is used to calculate the 1. A blade feed control device for a saw cutter, comprising: a blade feed speed control device that controls a blade feed speed of the saw cutter.