JPS62107950A - Traverse grinder - Google Patents

Abstract

PURPOSE:To prevent the generation of taper is skip by detecting the number of works after th correction of a grindstone and detecting the machining allowance of the work during skips nd carrying out integration and controlling the center of traverse shift according to the integration value. CONSTITUTION:The machining allowance DELTAD(j) detected at each time by machining-allowance calculating circuit 17 is added in succession during the time when the dressing is carried out after the first dressing in a machining- allowance integration calculation circuit 20, and the integration value IR is outputted into a table controller 13. The traverse shift center position thetac is calculated according to the integration value IR for the traverse shift center position thetaco which is initialized. In other words, when the integration value IR increases stepwise, the center position thetac shifts stepwise forward in the axial direction of a grindstone shaft 5. Therefore, even if a little deflection exists on the grindstone shaft 5, the retreat position of the grindstone 4 as the cause of taper is regulated, and grinding in tapered from is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a traverse which has a grindstone shaft equipped with a grindstone at the tip and grinds the workpiece by reciprocating the grindstone shaft back and forth in the width direction of the workpiece. The present invention relates to a grinding device.

[Prior Art] In general, this type of grinding machine is equipped with a dressing device that modifies (dresses) the surface of the grinding wheel using a modification tool such as a dressing diamond, for example, in order to maintain good sharpness of the grinding wheel. Some dressing methods perform dressing after each machining process, but depending on the type of workpiece, machining allowance, etc., it is not necessary to dress the grindstone every time, so a dressing method called skip dressing is adopted. There is.

This process processes multiple workpieces in one dressing.

Regarding this skip dress method, a skip dress method has also been proposed in which the machining allowance of the workpiece is detected and the number of times of machining (skip number) is variable (see Japanese Patent Application Laid-Open No. 134657/1983).

However, when this type of skip dress method is adopted, if the grinding wheel becomes clogged during skipping, grinding by the grinding wheel will not proceed, and a large bending force will be generated on the grinding wheel shaft due to the processing speed, and the grinding wheel itself will This causes a problem in that the machined surface is machined into a tapered shape.

If this phenomenon occurs for all workpieces, then
It is likely that the original number of skips was set incorrectly, but taper does not occur for most of the workpieces, but if such taper occurs for some of the workpieces, then the setting of the number of skips is inappropriate. Therefore, from the viewpoint of production efficiency, it is preferable to keep the number of skips as large as possible.

The dressing method described in the above publication determines the number of skips based on the machining allowance of one workpiece, so if there happens to be a workpiece that requires a large machining allowance while skipping up to the set number of skips, There is a risk that the grinding wheel may become clogged during this grinding, and in that case, the occurrence of taper will become unavoidable in subsequent grinding of the workpiece.

[Object of the Invention] An object of the present invention is to provide a traverse grinding device that can prevent the occurrence of taper during skipping by adjusting the center position of traverse movement so that taper does not occur during skipping. It is to provide.

[Structure of the Invention] Therefore, the present invention provides a traverse grinding device that has a grindstone shaft equipped with a grindstone at the tip and that grinds the workpiece by reciprocating the grindstone shaft back and forth in the width direction of the workpiece. a traverse moving device that reciprocates back and forth in the width direction of the work;
A grinding wheel correction device that corrects the grinding wheel after grinding multiple workpieces, a skip number detector that detects the number of processed workpieces after the grinding wheel correction, and a skip number detector that detects the machining allowance of the workpieces between the skips after the grinding wheel correction. A workpiece machining allowance accumulator for accumulating;
The present invention is characterized by comprising a traverse movement control device that controls a traverse movement center position according to an integrated value of workpiece machining allowance.

[Effects of the Invention] According to the present invention, during skipping, the center of movement of the traverse is automatically adjusted according to the sharpness of the grindstone, so it is possible to reliably avoid the occurrence of taper due to curvature of the grindstone shaft. This is especially effective in improving the straightness of the workpiece.

[Example] Hereinafter, an example of the present invention will be specifically described with reference to the accompanying drawings.

As shown in FIG. 1, the traverse grinding device includes a main shaft 2 that chucks a workpiece 1, a cutting table 3 that feeds the workpiece, and a grindstone shaft 5 that moves a grindstone 4.
a machining head 6 that is replaceably attached to the tip of the machining head 6, a grindstone table 7 that moves the machining head 6 back and forth in the axial direction, and a dressing device 9 that dresses the whetstone 4 with a dressing diamond 8.
It is composed of basic components.

The cutting motor 10 that feeds the cutting table 3 into a cutting is as follows:
It is controlled by a cutting control device 11.

Further, a table control device 13 is provided for the table control motor 12 that drives the grindstone table 7 in the axial direction, and the table control device 13 controls the table control motor 12 based on the following data, 5. Automatically adjust the traverse center position.

For this purpose, a bridge gauge 14 for measuring the inner diameter of the workpiece I to be machined and an improv gauge I5 for measuring the inner diameter of the workpiece being machined are used. The outputs of these two gauges 14 and 15 are manually input to a machining allowance calculation circuit 17 via a gauge amplifier 16.

This machining allowance calculation circuit 17 operates via a changeover switch 18.
It is also connected to a gap eliminator device 19 provided for the processing head 6, and when a contact signal is output by this gap eliminator device 19,
In response to this, the changeover switch 18 is switched to the gauge amplifier 16 side, and thereafter, the machining allowance ΔD (D) is calculated from the output difference between the filler gauge 14 and the improv gauge 15.

The machining allowance ΔD(j) detected for each machining process by the machining allowance calculation circuit 17 is input to the machining allowance accumulation calculation circuit 20, and the machining allowance calculation circuit 20 calculates the amount of machining allowance after dressing until the next dressing is performed. output to the table control device 13 once.

As shown in FIG. 2, this table control device 13 calculates the traverse movement center position θC according to the following equation based on the machining allowance integrated value IR with respect to the initially set traverse movement center position θco.

θC=　θco±　α°IR α is a control constant given experimentally.

This will be explained more specifically. Now, assuming that the integrated machining allowance value IR increases step by step as shown in FIG. 3(a), the traverse movement center position θC is aligned with the axis of the grinding wheel shaft 5 as shown in FIG. 3(b). Move forward in stages.

In this way, if the traverse movement center position θC is gradually moved forward, even if there is some deflection of the grinding wheel shaft 5, the retreating position of the grinding wheel 4, which causes taper, is restricted, so the tapered shape is prevented. It is never ground. In other words, the straightness of workpiece grinding is ensured.

The above control is reset with a dress completion signal,
The control shown in FIGS. 3(a) and 3(b) is repeated again.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention, FIG. 2 is a flow chart diagram showing the calculation flow of the above system,
FIGS. 3(a) and 3(b) are graphs showing changes in the integrated machining allowance value IR and corresponding setting patterns of the traverse movement center position. 1... Workpiece, 3... Cutting table, 4...
- Grinding wheel, 5... Grinding wheel shaft, 6... Processing head, 7... Grinding wheel table, 9... Dressing device, 12... Table control device, 14... Pre-gauge,
15...Impro gauge, I7...Making allowance calculation circuit,
20...Machining allowance accumulation calculation circuit. Patent applicant: Mazda Motor Corporation representative Patent attorney: Aohaku Ao and 2 others No. 31! f(o) μ′ J−+ N

Claims (1)

[Claims] (1) In a traverse grinding device that has a grindstone shaft with a grindstone at the tip and grinds by reciprocating the grindstone shaft back and forth in the width direction of the workpiece, the grindstone shaft is moved back and forth in the width direction of the workpiece. A traverse moving device, a grinding wheel correction device that corrects the grinding wheel after grinding multiple workpieces, a skip number detector that detects the number of workpieces processed after the grinding wheel correction, and a machining allowance of the workpiece between the skips after the grinding wheel correction. A traverse grinding device comprising: a workpiece machining allowance integrator that detects and adds up the workpiece machining allowance; and a traverse movement control device that controls a traverse movement center position according to the integrated value of the workpiece machining allowance.