KR100416485B1 - Method for setting vertical position of wire of cnc wire electric discharge machine - Google Patents

Abstract

PURPOSE: A method for setting the vertical position of a wire of a CNC(Computer Numerical Control) wire electric discharge machine is provided to set the verticality of the wire by accurately computing the vertical position of the wire with a computer numerical control program by utilizing a vertical position setting jig as a contact sensor. CONSTITUTION: In setting the vertical position of a wire(5) in machining a workpiece with a CNC wire electric discharge machine, a method for setting the vertical position of the wire of the electric discharge machine is provided to make the wire have four positions separated at regular intervals by moving an upper guide, contact the wire to a vertical position setting jig(7) by moving a table and reads coordinates(X1,X2,X3,X4) of each contact point at each position, compute distances separated from a vertical axis by geometrically analyzing the coordinates with a computer numerical control program, and set the vertical position by moving the table and the upper guide at the separated distance. The vertical position setting jig is used as a contact sensor to measure the position of the contact point of the wire in contacting the vertical position setting jig with the wire.

Description

How to vertically wire wire of CNC wire electric discharge machine

The present invention is to accurately set the vertical state of the wire in the machining of the workpiece with the CNC wire discharge machine.

The present invention relates to a CNC wire electric discharge machine, and receives the contact coordinates of the wire by using a vertical tool jig to calculate the coordinates to hold the exact vertical of the wire based on this, so that the wire to maintain the correct vertical state when processing the workpiece It is.

The CNC (Computer Numerical Control) wire electric discharge machine (hereinafter referred to as electric discharge machine) is a device that contacts a charged wire with a work and cuts the work using discharge energy generated at this time. The movement of the wire is controlled by computer numerical control.

1 is a schematic configuration diagram of an electric discharge machine.

There is a table (4) to which the work mounting table (3) is attached, an upper guide (1), a lower guide (2), and a wire (5) is connected through the upper die (10) and the lower die (20).

The table 4 can move in a plane, the upper guide 1 can move in both the up and down axial direction and the plane, and the lower guide 2 is fixed to the column 6 and does not move.

Before machining the workpiece, it is necessary to hold the wire 5 vertically. In general, the vertical holding jig 7 is used to hold the vertical.

The vertically straight jig 7 having a very perpendicular angle is fixed to the worktable 3, and the wire 5 is contacted to generate a weak discharge on the surface of the jig.

However, this method causes errors due to different vertical betting according to the operator, and the surface area of the vertical jig is discharged and the surface area once executed cannot be used again, so even if the storage condition is good, replacement is inevitable at some time. Do.

In order to compensate for the above disadvantages, the wire vertical alignment device may be designed and used separately, but it is not practical due to the high cost, and it is cumbersome to maintain a separate device.

In addition, the above two methods are not able to achieve the optimum vertical cutting for the thickness of the workpiece. The method of generating electric discharge by using a vertical measuring jig is difficult to check with the naked eye even if a jig suitable for thin material is made.However, the method of using a separate wire vertical measuring device can be used to make a device suitable for the thickness of the material. More expensive equipment is more expensive and difficult to use.

The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide a new wire vertical aligning method that can be used easily and accurately.

In order to achieve the above object, the present invention receives feedback of the contact coordinates of the wire by using a vertical positioning jig, and calculates the coordinates that hold the exact verticalness of the wires based on the feedback, and adjusts the position of the wire accordingly to the correct vertical state To keep it.

1 is a schematic configuration diagram of a CNC wire electric discharge machine

2 is an explanatory diagram showing a separation distance between a wire and a vertical axis;

3 to 4D are explanatory diagrams showing a method for determining contact point coordinates

5 to 6O are explanatory diagrams showing a method of calculating the vertical separation distance

7 is an explanatory diagram showing a method of performing a vertical bevel based on the calculated vertical separation distance;

<Explanation of symbols for the main parts of the drawings>

1: Upper guide

5: wire

7: vertical fixture

X₁, X₂, X₃, X₄: Coordinates of the contact points

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the present invention, the same or equivalent parts as in the prior art will be described with the same reference numerals.

2 is an explanatory diagram showing an outline of the present invention.

In order to accurately fit the wire 5 having any angle to the actual vertical axis, the distance s and s₂ from the vertical axis must be accurately known and moved by the same distance s₁, s₂. However, since the exact position of the vertical axis is usually unknown, the separation distances s₁ and s₂ are also unknown.

The outline of the present invention selects four positions of the wire 5 arbitrarily, reads the exact coordinates at each position using the vertical positioning jig 7, and calculates the separation distances s and s₂ from the vertical axis based on the exact vertical position. To match.

This will be described below.

As shown in FIG. 3, the coordinates X 이동, X₂, X₃, and X₄ are read at four positions ⓐ, ⓑ, ⓒ, ⓓ while the upper guide is moved by the same distance u.

In the method of reading the coordinates, as shown in Fig. 4A, the table is first moved at the position ⓐ, the vertical positioning jig 7 is brought into contact with the wire 5, and the coordinate X 'of the contact point is read. Due to the characteristics of the electric discharge machine, since the wire and the vertical tool jig are charged, the electric discharge machine itself acts as a contact sensor. Next, move the vertical positioning jig to the original position and move the upper guide u by u to the position of ⓑ and read the coordinate X₂ in the same manner as in FIG. 4B. In the same manner as above, the coordinates X 3 and X 에서 are read at positions C and D as shown in FIGS. 4C and 4D.

From the four coordinates obtained by the above method, the separation distances s₁ and s₂ from the vertical axis are as follows.

In FIG. 5, b to n are points at which the wires and each line intersect at their original positions, and A to O are points at which the wires and each line cross each other at positions where they are in contact with the vertical positioning jig. u is the movement interval of the upper guide, Z is the height of the vertical fixture.

6A-6O are respective partial views of FIG. 5. A calculation process is shown below based on drawing.

In Figure 6A,

NO = fg = X₂- X₁ = H015

In Figure 6B,

JK = lm = X₄- X₃ = H017

In Figure 6C,

NO + AB = bc

AB = bc-NO = u-H015 = H016

In Figure 6D,

EF + JK = de

EF = de-JK = u-H017 = H018

In Figure 6E,

QR = fg-jk = H015-H017 = H019

In Figure 6F,

bc = cd = de

fg = gh = hi

jk = kl = lm

In Figure 6G,

HI + JK = hi

HI = hi-JK = H015-H017 = H019

In Figure 6H,

HI: Z = JK: H020

H020 = Z × JK / HI = Z × H017 / H019

In Figure 6I,

QR: Z = AB: H021

H021 = Z × AB / QR = Z × H016 / H019

In Figure 6J,

BE + KN = cd

BE = cd-KN = H023

H023 = u-H022

Bc = Gg = X₂ = Nn

Kn = Pl = X₃

Kn-Nn = KN

X₃- X₂ = H022

In Figure 6K,

BE: (H030-H024) = KN: H024

BE × H024 = (H030-H024) × KN

(BE + KN) × H024 = KN × H030

H024 = KN × H030 / (BE + KN) = H022 × H030 / (H023 + H022)

In Figure 6L,

BE: H031 = GH: (H031-H021)

GH = BE × (H031-H021) / H031

H025 = H023 × (H031-H021) / H031

KN: H024 = PQ: (H024-H020)

PQ = KN × (H024-H020) / H024 = H026

H026 = H022 × (H024-H020) / H024

In Figure 6M,

PQ × Z / 2 = (Z × H027 + PQ × (H024-H020)) / 2

H027 = PQ × (Z-H024 + H020) / Z = H026 × (Z-H024 + H020) / Z

In Figure 6N,

H024: KM = H020: (KM-LM)

H020 × KM = H024 × (KM-LM)

H024 × LM = (H024-H020) × KM

KM = H024 × LM / (H024-H020) = H024 × H027 / (H024-H020) = H028

In Figure 6O,

BD: H031 = (BD-CD): H021

BD × H021 = (BD-CD) × H031

H031 × CD = (H031-H021) × BD

BD = H031 × CD / (H031-H021) = H031 × H027 / (H031-H021) = H029

The separation distances s₁ and s₂ are DF and JM, respectively. This can be expressed as

s₁ = DF = H023 + H018-H029 = H033

s₂ = JM = H017 + H028 = H032

According to the result obtained above, as shown in FIG. 7, the position of the wire 5 is moved in parallel from FJ to TM by H032, and the upper guide is moved from T to D by H032 + H033 to obtain the correct vertical line.

As described above, the present invention accurately calculates the vertical position of the wire by a numerical control program by using the vertical positioning jig as a contact sensor, and it is possible to accurately hold the verticality of the wire as long as the perpendicular jig has the correct perpendicularity.

Claims (2)

In the vertical alignment of the wire when machining the workpiece with the CNC wire cutting machine, the upper guide 1 is moved to set the wire 5 to have four positions spaced by the same distance u, and the table 4 is moved to the above. Read the coordinates X₁, X₂, X₃, X₄ of the contact point at each position by making the wire contact the vertical positioning jig 7, and interpret the coordinates by geometric method using a numerical control program to separate the distance s₁, A method of vertically aligning a wire of a CNC wire electric discharge machine, comprising calculating s2 and vertically moving the table (4) and the upper guide (1) by the separation distance. The CNC wire electric discharge machine according to claim 1, wherein the vertical positioning jig (7) is used as a contact sensor (i) to measure the contact point position of the wire when the vertical jig (7) and the wire (5) contact each other. How to wire vertically.