DE1563766C3 - Arrangement for cutting threads in a numerically controlled machine tool - Google Patents

Description

20 explains:

A digital pulse generator 2 in the form of a magnetic angular ^{incremental encoder is coupled to the spindle 1 of a machine tool and is provided with 2 10} = 1024 pulse marks on its circumference. Per

The invention relates to an arrangement 25 spindle revolution then reach 1024 pulses from for cutting threads on a numerically recording head 3 to a purely dual organized controlled machine tool with synchronization frequency divider 4. One of the programming between the transmitter 6 feed and spindle speed corresponding means of an 'th pitch The number of pulses from the spindle-driven digital pulses are then sent via the frequency divider 4 to the memory 7, the one corresponding to the desired thread 3 ° and serves as a reference variable for the feed in the programmed, dual-organized right-hand direction of the spindle axis. For the purpose of implementing the ner or frequency divider clocks, the output pulses of which are programmed decimally encoded and form the reference variable for the feed. The frequency divider 4 still has values in dual values

When thread cutting on a Werkzeugma- decimal-dual-converter 5 upstream,
machine, the workpiece feed must be in the direction of 35. Assume, for example, that 1024 pulses of the spindle axis are synchronized with the spindle speed per spindle revolution and that be. If the feed is taken directly from an output pulse of the frequency divider of a pre-spindle drive by a gear unit, both parts of a feed of 0.01 mm are equivalent to a maximum of self-synchronization. If you have programmed a pitch of 10.23 mm for the spindle and feed,
independent drives provided what z. B. often 40 should z. B. the pitch of 8.53 mm is programmed for plants equipped with numerical controls, the number 853 is decimally encoded in the machine tool. the frequency divider 4 then allows devices to be provided for relative synchronization. of 1024 incoming pulses 853 through.
In the case of a lathe, for example, this could result in 1000 pulses per revolution from the pulse generator.

If it happens that pulses are derived from the spindle rotation of the spindle can be used to control the feed. For this slope, no longer program directly, derive pulses from a rotary movement, but instead of the slope 853, the slope would have to be digital pulse generators in the form of angle increments 853 · 10000 _,,. . " _{,,, Nnn}

bem known (see, for example, Siemens magazine, ^{lm encoder 6.} ^ "tellt be, since 1000

1964, pp. 673 to 675), which is a power of 2 divided by 5 »not per revolution.

Issue 10 divisible number of pulses, e.g. in the present case, on the other hand, are from the

1000 pulses per revolution. Such an organizer divider stages 2 °, 2, 2 ⁴ , 2 ⁸ , 2 ¹⁰ and ^{-2 u} when the pulse generator is converted has the advantage that the 853 set pulses are divided directly or angles are decimally divided and can thus be taken . ■

The programming is also decimal. 55 The frequency divider is replaced by 'can be path. Controls for machine tools, for which the task now often occurs that a finding is important, the dual organized arithmetic unit machine tool, e.g. a lathe, which means that according to the DDA method (digital diffeeiner dual organized Path control (AEG Mit- rential-Analyzer) works. This is about Teilungen, 1961, p. 34 to 44) also for the ^{thread 6o} a method for the implementation of a given cutting is to be used. dual numerical value into a corresponding equidistant becoming here to derive the pulses the constant control pulse sequence. The binary number 2 " in the first register is used in a recognized decimally organized pulse generator, so - in contrast to the other numerical registers,« is added with «digits as many transfers of the second register, ie clock generator and dual feed control a di- the capacity of the second register is as often excessive programming of the thread pitch in deci- ses as it is no longer possible to remove the specified numerical value. speaks. If the transfers are used as control pulses,

in this way the given number has been converted into a corresponding equidistant pulse sequence, where the pulse repetition frequency is dependent on the frequency of the addition clocks.

In the present case, the content of the encoder is used for each addition cycle supplied by the pulse generator 2 6 (1st register) added to the content of a second register - the individual transfers then represent represents the reference variable for the feed as a control pulse sequence.

1 sheet of drawings

Claims (1)

1 2 The object of the present invention is Claim:. accordingly, in a machine tool for Cutting of threads in which a dual organic Arrangement for cutting threads with based feed control is provided, the cycle of a numerically controlled machine tool 5. would give for the feed control from the spindle with synchronization between feed and so that a decimal direct program spindle speed by means of an indicator from the spindle the thread pitch is possible.
driven digital pulse generator, the one This task is mentioned at the beginning according to the desired thread pitch arrangement achieved according to the invention in that the 'programmed, dual-organized computer or io pulse generator is provided with pulse marks, clocks frequency divider, the output pulses of which form 2 " pulses for the reference variable for the feed rate for each spindle revolution, the computer or Here, η is characterized by the fact that the pulse is any whole number. Through this dual organ transmitter (2) it is provided with pulse marks in such a way as to nize the pulse transmitter, which then e.g. to output 1024 pulses to the 15 rotation, the thread calculator or frequency divider (4) is then reached. 'Incline can be programmed directly and decimally as such a value can be entered into the controller. The invention is explained in more detail with the aid of a drawing