JPS6365468B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a processing speed indexing device, and is intended to be able to process a workpiece while following sudden changes in the shape of a model.

<Prior art> As shown in FIG. 5, a model 1 is traced by a tracer head 2 under the control of a digitizing device 3, the traced trajectory is converted into NC data 4 by the digitizing device 3, and the data is transmitted to the NC device 5. Conventionally, when machining the workpiece 7 into the same shape as the model 1 using the processing machine 6, it was not possible to control the machining speed according to the shape of the model 1. The servo becomes unable to follow the pattern, resulting in gouges and uncut parts. Therefore, in the past, in order to prevent gouges and uncut parts, the machining speed was manually changed or the machining speed itself was set low.

<Problems to be Solved by the Invention> As described above, when the machining speed is manually changed or the machining speed is set low, the machining efficiency deteriorates.

In view of the above-mentioned conventional technology, the present invention provides a machining speed indexing device that automatically controls the machining speed according to the shape of the model, thereby maintaining high machining efficiency and eliminating uncut material left on the workpiece. The purpose is to provide.

<Means for Solving the Problems> The present invention that achieves the above object includes a storage device that stores NC point sequence data obtained by a digitizing device;
A machining speed setting device that generates preset machining speed information, and an override speed that detects the shape change rate of the model from changes in the values of the NC point sequence data sequentially retrieved from the memory and is inversely proportional to this shape change rate. an override speed generator that calculates and further corrects the set machining speed information according to this override speed to obtain machining speed information; and machining speed information that adds machining speed information to NC point sequence data sequentially retrieved from the memory. Adder and NC with machining speed information based on the dispensing request from the NC device
It is characterized by a payout device that transmits point sequence data to an NC device.

<Examples> Examples of the present invention will be described in detail below based on the drawings. As shown in Fig. 1, the model 1 is traced by the tracer head 2, and the shape data of the traced model 1 is converted into X, Y, Z coordinate values as sampled NC point sequence data by the digitizing device 3. It is quantified. The digitized NC point sequence data is led to and stored in the storage device 8. remembered
Machining speed information is added to the NC point sequence data by a machining speed information adder 9, and the data is transmitted to the NC device 5 through the dispensing device 10 in response to a dispensing request from the NC device 5. The NC device 5 controls the processing machine 6 according to the transmitted NC point sequence data, and cuts the same shape as the model 1 from the workpiece 7. In this case, the machining speed corresponds to machining speed information. The machining speed setter 12 generates predetermined set machining speed information and sends it to the override speed generator 11. The override speed generator 11 reads the NC point sequence data from the memory 8, calculates the override speed by the processing shown below, and multiplies the set machining speed information sent from the machining speed setter 12 by the override speed for machining. Obtain speed information, transfer it to the machining speed information adder 9, and add the determined machining speed to the NC point sequence data.

The override speed is calculated as follows.

As shown in Figure 2, connect the NC point sequence data to P _i-1 P _i
Calculate the angle α formed by P _i P _{i+1 with respect to P i P i+1} . This α
represents the change in the next movement relative to the current movement, and if the model shape changes suddenly, α becomes large. For this α, as shown in FIG. 3 or 4, an override speed is generated which is inversely proportional to α.
Therefore, if the model shape suddenly changes, α increases and the override speed decreases in inverse proportion to α, resulting in a decrease in machining speed. Conversely, when the change in model shape becomes smaller and α also becomes smaller, the override speed increases and the machining speed increases.

In this manner, by calculating the override speed according to the shape of the model 1, the machining speed can be automatically determined according to the model shape, and it is possible to eliminate gouges and uncut parts in areas where the shape suddenly changes.

<Effects of the Invention> As specifically explained above in conjunction with the embodiments, according to the present invention, it is possible to accurately perform machining without biting into the workpiece or leaving uncut parts while maintaining high machining efficiency.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram showing a method for determining the shape change rate from NC point sequence data, and Figs. 3 and 4 are characteristics of override speed with respect to shape change rate. A characteristic diagram showing
FIG. 5 is a block diagram showing the prior art. In the drawing, 1 is the model, 2 is the tracer head, 3
is a digitizing device, 5 is an NC device, 6 is a processing machine,
7 is a workpiece, 9 is a machining speed information adder, 10 is a payout device, 11 is an override speed generator, and 12 is a machining speed setter.

Claims (1)

[Scope of Claims] 1. An NC that receives the NC point sequence data from a digitizing device that obtains NC point sequence data by sampling and digitizing the shape of the model traced with a tracer head, and that also has machining speed information attached.
By receiving point sequence data, machining speed is assigned to the NC device that controls the processing machine based on NC point sequence data.
A machining speed indexing device that sends NC point sequence data, comprising: a storage device that stores the NC point sequence data obtained by the digitizing device; a machining speed setting device that generates preset setting machining speed information; The shape change rate of the model is detected from changes in the values of the NC point sequence data retrieved sequentially from the memory, an override speed that is inversely proportional to this shape change rate is calculated, and the set machining speed information is corrected according to this override speed. An override speed generator that obtains machining speed information, a machining speed information adder that adds machining speed information to the NC point sequence data sequentially retrieved from the memory, and an NC that appends machining speed information based on a delivery request from the NC device. A processing speed indexing device comprising: a payout device that transmits point sequence data to an NC device; and a processing speed indexing device.