GB1213648A

GB1213648A – Electric discharge machining apparatus
– Google Patents

GB1213648A – Electric discharge machining apparatus
– Google Patents
Electric discharge machining apparatus

Info

Publication number
GB1213648A

GB1213648A
GB54196/67A
GB5419667A
GB1213648A
GB 1213648 A
GB1213648 A
GB 1213648A
GB 54196/67 A
GB54196/67 A
GB 54196/67A
GB 5419667 A
GB5419667 A
GB 5419667A
GB 1213648 A
GB1213648 A
GB 1213648A
Authority
GB
United Kingdom
Prior art keywords
transistor
resistance
circuit
base
capacitance
Prior art date
1966-12-19
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Application number
GB54196/67A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Siltronics Inc

Original Assignee
Siltronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1966-12-19
Filing date
1967-11-28
Publication date
1970-11-25

1967-11-28
Application filed by Siltronics Inc
filed
Critical
Siltronics Inc

1970-11-25
Publication of GB1213648A
publication
Critical
patent/GB1213648A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

238000003754
machining
Methods

0.000
title
1

XUIMIQQOPSSXEZ-UHFFFAOYSA-N
Silicon
Chemical compound

[Si]
XUIMIQQOPSSXEZ-UHFFFAOYSA-N
0.000
abstract
1

239000004020
conductor
Substances

0.000
abstract
1

230000003247
decreasing effect
Effects

0.000
abstract
1

230000001934
delay
Effects

0.000
abstract
1

QSHDDOUJBYECFT-UHFFFAOYSA-N
mercury
Chemical compound

[Hg]
QSHDDOUJBYECFT-UHFFFAOYSA-N
0.000
abstract
1

229910052753
mercury
Inorganic materials

0.000
abstract
1

229910052710
silicon
Inorganic materials

0.000
abstract
1

239000010703
silicon
Substances

0.000
abstract
1

Classifications

B—PERFORMING OPERATIONS; TRANSPORTING

B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR

B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL

B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric

B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges

B23H1/022—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges for shaping the discharge pulse train

Abstract

1,213,648. Electro-erosion. SILTRONICS Inc. 28 Nov., 1967 [19 Dec., 1966], No. 54196/67. Heading B3V. [Also in Divisions H3-H5] An electro-erosion machine includes a capacitance means 201, Fig. 4, charged from a unidirectional potential source 281 through a slower charging element 241 or a faster charging element 261, the latter of which is connected in circuit by a switching means 581 when the gap has deionized sufficiently following each discharge thereacross to permit a faster capacitance charging rate. Input signals are applied through a low pass filter 76 to the base of a transistor 72 of a keying circuit 621 and as biases to the emitters of transistors 70, 72. At low gap voltages the collector of transistor 72 and the base of transistor 70 assume the potential of the source 281 to turn on the transistor 70, the low negative potential of the collector of which is applied to the base of the transistor 581 which is biased to cut-off. The capacitance 201 is thereby slowly charged through the resistance 241. When the gap has deionized to about 20 volts, the base potential of the transistor 70 is decreased by the transistor 72 causing the transistor 70 to be cut off and the main supply potential 281 to be applied to the transistor base 581 so that the faster charging resistance 261 is brought into circuit. The transistor 581 is biased to cut off when the gap voltage has fallen again to about 20 volts. In another embodiment, Fig. 8, the spark cutting time is increased by a pulse prolonging circuit 901 which delays the reopening of the transistor 581. Upon cessation of the keying circuit 621 pulses, a monostable multivibrator circuit 104 continues to deliver a voltage on an output conductor 106 to the base of the transistor 581 to maintain it closed. The multivibrator circuit 104 is then returned automatically to its stable condition. The unstable interval is adjustable by a variable resistance 110. In a further embodiment, Fig. 10, during the slow charging of the capacitance 201 the circuit includes a resistance 146 plus the resistance of a transistor 140 which is switched partly on by a voltage source 148 and resistance 150. When the transistor 140 is switched full on by the keying circuit 621 it offers little resistance so that the charging rate of the capacitance 201 is greater. The resistance 146 can be omitted and the amplitude of the keying circuit output pulses reduced by a resistance 152. The switch 581 may be a transistor, silicon controlled rectifier, thyratron or mercury arc device.

GB54196/67A
1966-12-19
1967-11-28
Electric discharge machining apparatus

Expired

GB1213648A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

US60272466A

1966-12-19
1966-12-19

Publications (1)

Publication Number
Publication Date

GB1213648A
true

GB1213648A
(en)

1970-11-25

Family
ID=24412544
Family Applications (2)

Application Number
Title
Priority Date
Filing Date

GB20725/70A
Expired

GB1213649A
(en)

1966-12-19
1967-11-28
Dual rate charging circuit

GB54196/67A
Expired

GB1213648A
(en)

1966-12-19
1967-11-28
Electric discharge machining apparatus

Family Applications Before (1)

Application Number
Title
Priority Date
Filing Date

GB20725/70A
Expired

GB1213649A
(en)

1966-12-19
1967-11-28
Dual rate charging circuit

Country Status (2)

Country
Link

US
(1)

US3549851A
(en)

GB
(2)

GB1213649A
(en)

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

EP0027040A1
(en)

*

1979-10-04
1981-04-15
Fanuc Ltd.
A wire-cut electric-discharge machine and a power source for such a machine

Families Citing this family (8)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

CH517039A
(en)

*

1970-01-14
1971-12-31
Peyer Siegfried

Device for determining the efficiency of a winding machine

US3969601A
(en)

*

1971-04-02
1976-07-13
Rocklin Isadore J
Electronic spark treating and eroding metals

US4031559A
(en)

*

1975-12-10
1977-06-21
Bell Telephone Laboratories, Incorporated
Filter capacitor charging circuit

JPS5656341A
(en)

*

1979-10-05
1981-05-18
Fanuc Ltd
Power source for wire cut electric discharge machining

JPS6014653B2
(en)

*

1980-02-26
1985-04-15
株式会社井上ジャパックス研究所

Electric discharge machining equipment

US4405975A
(en)

*

1981-10-29
1983-09-20
Gte Products Corporation
Power supply start-up circuit

JPS6066417U
(en)

*

1983-10-12
1985-05-11
フアナツク株式会社

Wire cut electric discharge machining power supply device

US5030844A
(en)

*

1990-06-25
1991-07-09
Motorola, Inc.
DC power switch with inrush prevention

1966

1966-12-19
US
US602724A
patent/US3549851A/en
not_active
Expired – Lifetime

1967

1967-11-28
GB
GB20725/70A
patent/GB1213649A/en
not_active
Expired

1967-11-28
GB
GB54196/67A
patent/GB1213648A/en
not_active
Expired

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

EP0027040A1
(en)

*

1979-10-04
1981-04-15
Fanuc Ltd.
A wire-cut electric-discharge machine and a power source for such a machine

Also Published As

Publication number
Publication date

US3549851A
(en)

1970-12-22

GB1213649A
(en)

1970-11-25

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Legal Events

Date
Code
Title
Description

1971-05-19
PS
Patent sealed [section 19, patents act 1949]

1973-06-20
PLNP
Patent lapsed through nonpayment of renewal fees

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