JPS63300865A - Grinding device - Google Patents

Abstract

PURPOSE:To avoid the need of a large-sized motor for a grindstone and improve the working efficiency and suppress the thermal trouble such as grinding burn providing an allowable range for the grinding resistance of a rotary grindstone for grinding the burrs of a work and controlling the approach speed between the work and the rotary grindstone. CONSTITUTION:Grinding is started after inputting the data such as the locus for grinding a work 18, upper and inermediate set values of the grinding resistance, and the advance speed of a rotary grindsrone 10, and a control panel 28 always measures the grinding resistance of the rotary grindstone 10 as the electric currnent value of a driving motot 12. The grinding resistance and the upper and intermediate set values are compared, and if the grinding resistance is less than the intermediate set value, grinding is performed as set in the initial time, and when the grinding resistance is over the intermediate set value and less than the upper set value, the advance speed of the rotary grindstone 10 is decelerated to the set value, and when the grinding resistance exceeds the upper limit value, the rotary gringstone 10 is once separated from the work 18, and then advance grinding is perfornmed at the initial speed again. Therefore, the grindstone 10 does not apply a pressure over a certain value onto the work 18, and the need of a large-sized motor is avoided, and grinding is not interrupted, and the working efficiency can be improved, and the thermal trouble such as grinding burn of the work can be prevented.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a grinding device.

(Prior art) The higher the removal speed, the better for removing casting feeders and stubs. Also, in general grinding, due to the development of high-strength materials, cutting work is sometimes omitted and final finishing is performed by heavy grinding, and a grinding technology with high removal efficiency is required.

However, when such heavy grinding is performed, the grinding wheel is severely worn out, which is not only uneconomical, but also has the disadvantage that the workpiece is denatured due to the heat generated by the high grinding resistance, leading to a decrease in quality.

As a technology to solve this problem, JP-A-57-83
It is disclosed in No. 359.

This technique will be explained with reference to FIG.

Abrasion of the grindstone 100 and burning of the workpiece 102 can be prevented,
In addition, in order to efficiently grind with a motor 106 with a constant small power, a rotary whetstone 100 is provided to remove burrs, cracks, etc. from a workpiece 102 such as a casting supported by a support mechanism 104 for the workpiece 102. In the cutting/grinding grinder for cutting/grinding and removing with a grinding wheel 1
00 is provided so as to be movable toward and away from the workpiece 102, and is provided with a detection section that detects the cutting/grinding resistance of the workpiece 102, and when the cutting/grinding resistance exceeds a predetermined value, a signal from the detection section is provided. A cutting/grinding grinder characterized by being provided with a contact/separation movement control mechanism that moves the rotary grindstone 100 away from the surface of the workpiece 102 relative to the workpiece 102 in response to a signal to completely release the cutting/grinding resistance. It is.

(Problem to be solved by the invention) However, the above conventional technology prevents the wear of the grindstone,
It has a remarkable effect in preventing deterioration of quality due to deformation of the workpiece due to heat generated by grinding resistance, but
There are the following problems.

If grinding resistance exceeding a preset value is detected, grinding will definitely be stopped, so if only a small amount of grinding is required, and the load is increased within the allowable range for the rotary grindstone, the grinding process will be stopped. There is a problem that the grinding is stopped even when the grinding is completed, and in this case, in order to continue the grinding, it is necessary to input the setting values again, which is troublesome and difficult for inexperienced users. .

Therefore, an object of the present invention is to provide a grinding device that employs a control method that provides a tolerance range for grinding resistance.

(Means for solving problems) In order to solve the above problems, the present invention has the following configuration.

That is, in a grinding device that uses a rotary whetstone to grind burrs, etc. on a workpiece, there is provided a grinding resistance detection unit that detects the grinding resistance of the rotary whetstone, and a grinding resistance detector that is a reference value for controlling the approach speed between the workpiece and the rotary whetstone. an input section for inputting an intermediate setting value and an upper limit setting value of the resistance; a storage section for storing the intermediate setting value, upper limit setting value, etc. input from the input section; and detection by the grinding resistance detection section. The present invention is characterized by comprising a CPU that compares the resulting grinding resistance with the intermediate setting value and the upper limit setting value stored in the storage unit to control the approach speed of the rotary grindstone to the workpiece.

(effect) Next, the effect will be explained.

FIG. 1 shows a grinding device.

The control 138 is preloaded with a program shown in the flowchart of FIG.

First, on the trajectory and grinding resistance for grinding the workpiece 18,
When data such as intermediate setting values and the forward speed of the rotary grindstone are input, the clamp 22 holds the workpiece 18 and starts grinding according to the program and input data.

The control panel 38 constantly measures the grinding resistance of the rotary grindstone 10 to be ground as the amount of current of the drive motor 12 using a grinding resistance detection section (not shown).

A CPU (not shown) disposed in the control 138 compares the grinding resistance with the two set values, and if the grinding resistance is less than the intermediate set value, grinding is performed as initially set.

If the grinding resistance is greater than or equal to the intermediate setting value and less than the upper limit setting value, the CPU reduces the forward speed of the rotary grindstone 10 to a preset value and performs grinding again.

Furthermore, if the grinding resistance exceeds the upper limit setting value, the CPU causes the rotary grindstone 10 to once separate from the surface of the workpiece 18, and then resumes forward grinding at the initial forward speed.

When the grinding is finished, the CPU transports the workpiece 18 to the unloading position using an appropriate moving mechanism and opens the clamp 22.

(Embodiments) Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a grinding device according to the present invention.

Reference numeral 10 denotes a rotary grindstone, which is rotated by a suitable means for transmitting rotational force from a drive motor 12. The rotating grindstone 10 is moved up and down along a pole 16 by a grindstone up and down movement device 14 using a servo motor.

The rotating grindstone 10 is moved toward and away from the surface of the workpiece 18 by a grindstone advancement device 20, and the speed is 0.1 mn+/pulse.

22 is a clamp, which holds the workpiece 18 to the jig 2 using hydraulic pressure.
4. Hold on top.

Reference numeral 26 denotes a rotary table, which is placed on the bed 28 and rotated by a servo motor.

30 is a Z-axis control device having a servo motor, which moves the bed 28 along the rails 32.

34 is an X-axis control device having a servo motor, which moves the bed 28 along the rail 36.

Control of each of the above-mentioned operations is performed by an NC control mechanism.

A control panel 38 controls the NC control mechanism. The control panel 38 also includes a grinding resistance detector (not shown) that measures the amount of current (or power consumption) of the drive motor 12, and a keyboard for inputting data necessary for NC control, which will be described later. An input section 40 stores the data input from the input section 40 (not shown) and stores the grinding resistance data sent from the grinding detection section and the storage section. It has a CPU (not shown) that compares stored data and controls the entire device.

Next, the operation of the NC control mechanism will be described.

If multiple programs exist in the NC control mechanism, load the desired program accurately. If it is a single program, load the program.

The contents of this program are as shown in the flowchart of FIG.

When the program is loaded and executed, the control gi
Necessary data must be input from the input section 40 provided in 3B.

The data are as follows.

These include the grinding locus, the intermediate set value and upper limit set value of the grinding resistance, the forward speed of the rotary grindstone, the amount of deceleration of the forward speed of the rotary whetstone when the grinding resistance exceeds the intermediate set value, the amount of grinding, etc.

Next, the operation will be explained in detail based on FIGS. 1 and 2.

First, the workpiece 18 is placed on the jig 24 at an appropriate position.

Next, turn on the power to the grinding device.

Load the aforementioned program and transfer various data to the control panel 3.
Input to 8.

When inputting the required data is completed, the grinding device starts up.

First, the clamp 22 is closed and the workpiece 18 is placed on the jig 24.
hold on top.

The rotary grindstone 10 receives rotational force from the grindstone drive motor 12 and rotates in a predetermined direction at an appropriate rotation speed.

The rotary grindstone IO performs grinding according to the grinding locus and grinding amount that are stored in advance in the storage section.

The grinding position of the rotary grindstone 10 is determined by the CPU controlling the movements of the grindstone vertical movement device 14, the grindstone advancement device 20, the X-axis control device 34, the Z-axis control device 30, and the rotary table 26.

The CPU constantly detects the grinding resistance of the rotary grindstone 10 based on the program.

The detection of this grinding resistance is performed using the drive morph 1 of the rotary grindstone 10.
Since a constant voltage is supplied to the drive motor 2, a change in the current of the drive motor 12 due to a change in the grinding resistance is detected by a grinding resistance detection section provided in the control panel 38. Changes in power may be detected instead of changes in current.

As the grinding resistance increases, the amount of current or power also increases accordingly.

The measured grinding resistance is sent as data to the CPU of the control ff 138 and compared with the intermediate setting value and upper limit setting value of the grinding resistance.

If the measured grinding force is less than the intermediate setting value, CP
U has the grinding performed as scheduled.

If the grinding resistance is greater than or equal to the intermediate setting value and less than the upper limit setting value, the forward speed of the rotary grindstone 10 is reduced by the amount inputted in advance, and grinding is performed again. Therefore, it is possible to grind even moderate burrs.

When the grinding resistance becomes less than the intermediate setting value again, the forward speed of the rotary grindstone 10 returns to the predetermined value.

If the burr or the like to be ground is large, the grinding resistance may exceed the upper limit set value. In this case, the CPU controls the rotary grindstone 10 so that it once leaves the surface of the workpiece 18 and continues grinding again at the initial forward speed.

Therefore, by continuing grinding, a large force is applied to the rotary grindstone 10, which may cause the rotary grindstone 10 to break or cause heat generation to cause the workpiece to
8 can be prevented from deforming.

When the grinding is completed, the workpiece 18 is transported to a carry-out position (not shown), and the clamp 22 is baked.

In this embodiment, the grinding resistance was determined as the amount of current or power, but there is also a method of detecting the pressure by bringing the fixing mechanism of the workpiece 18 into contact with a semiconductor strain element or the like and converting the pressure into voltage using the piezoelectric effect.

Although various preferred embodiments of the present invention have been described and explained above, the present invention is not limited to the above-described embodiments, and can be modified in many ways without departing from the spirit of the invention. Of course.

(Effects of the Invention) According to the present invention, since the rotating grindstone does not apply pressure exceeding a certain range to the workpiece, there is no need to use a large motor, and no unreasonable pressure is applied to the rotating grindstone. , the damage can be prevented.

Since a permissible range is set for the grinding resistance of the rotary grindstone, grinding does not have to be stopped immediately when the grinding resistance reaches a specific value, which improves work efficiency.

Of course, when the rotary grindstone separates, the workpiece is effectively cooled, so it is possible to prevent damage caused by heat such as grinding and burning of the workpiece, which has a great effect both technically and economically.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating a grinding device according to the present invention, FIG. 2 is a flowchart illustrating a control method according to the present invention, and FIG. 3 is a diagram illustrating a conventional grinding device. 10... Rotating grindstone, 12... Drive motor, 18...
- Workpiece, 20... Grinding wheel advancement device, 22... Clamp, 38... Control panel, 40... Input unit.

Claims (1)

[Scope of Claims] 1. A grinding device for grinding burrs, etc. on a workpiece using a rotary grindstone, comprising: a grinding resistance detection section for detecting grinding resistance of the rotary grindstone; and for controlling the approaching speed of the workpiece and the rotary grindstone. an input section for inputting an intermediate setting value and an upper limit setting value of the grinding resistance, which are reference values of the grinding force; a storage section for storing the intermediate setting value, upper limit setting value, etc. input from the input section; comprising a CPU that compares the grinding resistance detected by the grinding resistance detection section with the intermediate setting value and the upper limit setting value stored in the storage section to control the approach speed of the rotary grindstone to the workpiece. A grinding device featuring: