JPS59110539A - Surface grinding machine - Google Patents

Abstract

PURPOSE:To prevent the increase of a finishing allowance due to mounting and removal of a work so as to spread the freedom of high accurate grinding wheels, by providing one spindle of a work rotating device for the two spindles of roughing and finishing wheel rotary spindles. CONSTITUTION:One spindle of a work rotating device 4 is provided, while a roughing wheel rotary spindle 3A and a finishing wheel rotary spindle 3B are parallelly arranged to said one spindle to the left and right of this spindle of the work rotating device 4 serving as the center. For rotation of the spindle of the work rotating device 4, the roughing rotary spindle 3A is lowered, grinding the surface of a work 2. The spindle 3A, after grinding the work for a required time, is lifted, and the finishing wheel rotary spindle 3B is immediately lowered to perform finishing work.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface grinding machine that can finish the Δ upper interior of a workpiece with good precision through rough machining and finishing machining, and is compact and can be manufactured at low cost.

Most of conventionally used flat grinding machines using cup-shaped grinding wheels have the configuration shown in FIGS. 1 and 2.

That is, the one shown in Fig. 1 is composed of one shaft of the grinding wheel 1 and one shaft of the grinding device 4, and has a structure that can be finished in one time, and the one shown in Fig. 2 In this case, rough machining station A and finishing machining station B are configured separately, and both stations A.

The workpiece is transported between 8 spaces by a transport device.

The operations shown in FIGS. 1 and 2 are such that the workpiece 2 chucked to the workpiece rotation device 4 on the bed 7 rotates, and the cup grindstones 1, IA, and IB rotate while the fixed grindstones rotate. As the spindle 3 or slide unit 14 descends, it hits the grindstone 1, IA, IB & workpiece 2, and cuts by the thrust generated by the hydraulic cylinder 8.

Note that the grindstone rotating spindle 3 is fixed to a slide unit 14, and its rotation is applied by a motor 9. Further, the slide unit 14 is guided by a slide 52 fixed to the column 6 and moves straight down and down accurately. Then, the entrance conveyance device 10 and the intermediate conveyance device 11 in FIG. The exit conveyance device 12 chucks the workpiece 2 and conveys the workpiece between stations.

Especially in conventional surface grinding machines such as those mentioned above.

In the case shown in Fig. 2, the workpiece 2 that has been ground by the rough machining station A is once removed from the chuck of the work rotation device 4, and then processed in the same manner by the finishing machining station B in the primary process. , for machining workpieces 2 with low rigidity or workpieces 2 that require high precision flatness and surface roughness, rough machining station A has good accuracy (workpiece 2 that has been machined or finishing machining station B
In order to re-chuck it, a crack occurred in work 2.

In order to remove this inclination and ensure the required accuracy, a large amount of grinding allowance must be taken.

The larger the diameter of the workpiece 2, the larger the grinding allowance (a in Figure 4 (a)) becomes, which also poses a problem in terms of accuracy and cycle time. In FIG. 4, reference numeral 13 denotes a collet chuck for chucking and rotating the inner diameter portion of the workpiece 2. In general, the smaller the machining allowance for finishing, the higher the accuracy is ensured, but with conventional grinders, the machining allowance is too large, so the reliability of ensuring accuracy is somewhat low. In general, for grinding (which is becoming more common), as the machining allowance increases, it is necessary to improve the sharpness of the grinding wheels IA and IB and ensure surface roughness, but on the contrary, it is said that the sharpness decreases. Their contradictory characteristics become an obstacle, and the range of selection of grinding wheels IA and IB is naturally limited.Furthermore, since the finishing and rough machining scales are separated, automatic machines are unable to handle the intermediate range between the two scales. There are disadvantages such as increased production costs for the conveyance device and workpiece axis sequence circuit.

Therefore, in view of the above-mentioned conventional circumstances, the present invention has been proposed in a surface grinding machine, in which the axis of the work rotation device is configured as one axis in contrast to the two axes, the grindstone rotation axis for rough machining and the grindstone rotation axis for finishing machining. This ensures high precision (to ensure flatness,
The present invention provides a surface grinder that increases the accuracy of grindstone selection and reduces manufacturing costs of the grinder.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4 (b).

In these figures, the same elements as in FIGS. 1 and 2 are given the same reference numerals to simplify the explanation.

In FIG. 3, the components of the axis of one roughing grindstone, the axis of finishing grindstone 1B, and the axis of work rotation device 4 are the same as those of the conventional ones, or the axis of work rotation device 4 or one axis. The rough machining grindstone rotating spindle 3A and the finishing grindstone rotating spindle 3B are arranged parallel to each other on the left and right sides of the axis of the work rotation device 4.

Therefore, in this configuration, there is no distinction between a rough machining station and a finishing machining station as in the prior art, and there is no intermediate conveyance device.

Next, the machining operation of such a grinding machine will be explained.

In response to the rotation of the shaft of the work rotation device 4, the rough machining grindstone rotating spindle 3A descends to grind half of the work 20.

After this spindle 38 has processed for the required time, it rises,
Immediately, the finishing grindstone rotating spindle 3B descends to perform one finishing process. The movements of these two spindles 3A and 3B can also overlap unnecessary movements. or,
In order to prevent resonance due to the rotation of the two spindles 3A and 3B during finishing machining, the rotation of the rough machining grindstone rotating spindle 3A is stopped. Further, the shaft of the work rotation device 4 is configured to instantaneously change the rotation speed by an inverter or the like during rough and finishing machining.

According to the grinding machine with the above configuration, since there is no need to attach or detach the workpiece chuck during rough machining and finish machining using one chuck, it is possible to perform finish machining while maintaining the accuracy (flatness) of rough machining, as shown in Figure 4. As shown in b), the machining allowance can be kept to a very small amount. Therefore, the load (grinding resistance, grinding time) applied to the workpiece 2 during finishing machining is small, ensuring high accuracy.Especially for workpieces with low workpiece rigidity.

Large-diameter workpieces, greasy workpieces that expand greatly due to grinding heat (one thing is that the benefits are large).

On the other hand, if surface roughness is required, use a sharp whetstone in rough machining to achieve accuracy such as flatness, and in finishing machining use a polishing action (rather than grinding) that cuts only the rough surface of the varnish surface created by rough machining. It has a wide range of applications considering its effect (like borising). Further, according to this configuration, the finishing slope cost is reduced, so there is less wear and tear on the finishing whetstone. As for the manufacturing cost, the shaft portion of the work rotation device 4, the intermediate conveyance device, and the electrical sequence related thereto can be omitted, so the cost is low. Furthermore, it also has the effect of being compact in terms of space.

As explained above, according to the present invention, in a surface grinder, the work rotation device has one axis for two axes, the roughing grinding wheel rotation axis and the finishing grinding wheel rotation axis, so that
It is possible to prevent an increase in machining allowance during finishing machining due to the attachment and detachment of workpieces, thereby ensuring high precision, expanding the degree of freedom of nine stones, and significantly reducing the manufacturing cost of the grinder.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams showing examples of conventional surface grinders, respectively, (a) is a front view, (middle) is a plan view showing the positional relationship between the workpiece and the grinding wheel, and Figure 3 is the invention of the present invention. FIG. 4 is a diagram showing an embodiment of a surface grinder according to the present invention, in which (a) is a front view, (b) is a plan view showing the positional relationship between the workpiece and the grinding wheel, and FIG. 4 is a diagram showing the workpiece during finishing after rough machining. 2A and 2B are diagrams showing image blur, in which (a) shows a conventional example and (b) shows an embodiment of the present invention. 1 person... Grinding wheel for rough processing 1B... Grinding wheel for finishing processing 2... Workpiece 3A, 3B... Grinding wheel rotation spindle 4... Work rotation device representative Shin Kuzuno - (1 other person) No. Figure 3 (A) Hi Figure 4 (A)

Claims (1)

[Claims] In a surface grinding machine that grinds a rotated workpiece by applying a grindstone rotated once to the workpiece,
A single workpiece rotation device is provided to support and rotate the workpiece, and a pair of grindstone rotation spindles for fixing and rotating a roughing grindstone and a finishing grindstone, respectively, are installed in the direction of their respective rotational axes or in the direction of the workpiece rotation device. A surface grinding machine characterized by being installed in parallel in a direction parallel to a rotating shaft direction.