JPS5947156A - Method and device for polishing hydraulically vibrating surface - Google Patents

Abstract

PURPOSE:To enable highly accurate and high-speed polishing up to every corner of labyrinth holes by polishing a workpiece which is fitted to the work grip of a double acting hydraulic cylinder, in a media vessel through the operation of a servo valve connected to a vibration command signal generator. CONSTITUTION:A workpiece (a) is fitted to a work grip 4 at the tip of a cylinder rod 3, a hydraulic cylinder 1 is driven at high speed, a polishing vessel 2 containing media is raised and the workpiece (a) is plunged into the media. On the other hand, oil pressure is generated through an oil-pressure unit 8 connected to the hydraulic cylinder 1, and is transmitted to a servo valve 9. Furtheremore, vibration command signals, which are transmitted to a servo amplifier 10, and after amplified, they are also inputted in the servo valve 9 to generate hydraulic vibration, thereby vertically vibrating the cylinder rod 3. That is, the vibration directly applied to the workpiece due to oil pressure enabled the use of minute media which will not cause clogging, thereby providing smooth and uniform polishing with small finished-surface roughness, regardless of the depth and shape of the holes.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic vibratory surface polishing method and apparatus for charging a workpiece and polishing the workpiece by vibration.

In the manufacturing process of articles with holes, there is a need to polish the inner surface of the hole, and various processing methods are known, but all of them have advantages and disadvantages, and the final polishing process is a manual process using multiple polishing methods. Finishing work must be done. In other words, the method using a ylt-ning machine, in which a grinding wheel is reciprocated and interlocked for polishing, has limitations on the size and depth of the hole to be machined, and it is not possible to machine labyrinth holes.In addition, it is not suitable for mass production, and There is also the problem of secondary Paris occurring. On the other hand, with the air blast method that uses compressed air, the smoothness of the surface after polishing is low, and H
Satisfactory results are not obtained, and the pressure in the labyrinth hole is reduced when air passes through the hole, resulting in local differences in polishing conditions and non-uniformity. Moreover, it requires high air pressure, which requires a large amount of power. Furthermore, the abrasive grains are forced into the surface (sometimes embedded in the surface of the sheet, resulting in a rough finish, and secondary cracks may occur, resulting in precision finishing damage. Second, with the impact processing method, the workability changes depending on the physical properties of the workpiece, such as the molten metal content, thermal conductivity, corrosion resistance, and specific heat, and the material to which it can be applied is limited. The deformation of t= is 41; in addition, there are many problems such as precision finishing is not possible, mass production is not possible, working condition settings are difficult, operability is not easy, there is a risk of explosion, and smooth finishing is not possible. Next, depending on the known rotary barrel polishing method, vibrating barrel polishing method, and centrifugal barrel polishing method, the j
If + polishing, deburring is almost impossible. On the other hand,
Although the viscoelastic abrasive flow processing method can simply polish the inner surface of a hole in a large-sized workpiece, the process of removing and cleaning the abrasive grains after polishing is complicated, and the degree of polishing of corners and flat surfaces is difficult. The gyro polishing method The spin finish polishing method is also unsuitable for polishing the inner surface of a hole. Furthermore, with the method of using an ovo-resonant processing machine, the beam to which the workpiece is attached must be extremely sturdy, the frequency must be constantly adjusted depending on the weight of the workpiece, and the properties of the abrasive may vary. There are problems such as the need to adjust the vibration conditions and the inability to change the machining conditions.

The present invention was completed with the aim of providing a hydraulic vibration type surface polishing method and an apparatus therefor developed in view of the current situation. The surface of the workpiece is polished by holding it in a workpiece grip and placing it into the media stored in the fJf polishing tank while directly vibrating the workpiece by the high-speed drive of the oil 1-F cylinder. The first invention is a hydraulic vibratory surface polishing method characterized by Oil 1- of the hydraulic cylinder across the work grip to be charged into the media
A second invention provides a hydraulic vibrating surface polishing apparatus characterized in that the E circuit incorporates a servo valve connected to a vibration command signal generator via a servo amplifier. The present invention will be explained in detail below using a vibrating surface polishing apparatus as shown in the drawings.

(1) is a double-acting hydraulic cylinder, and the hydraulic cylinder (1) is installed above a polishing tank (2) which can be moved up and down, with a cylinder rod (3) facing downward. A work grip (4) is provided at the tip of 3) for holding the workpiece (a) and loading it into the media housed in the polishing tank (2).
ing. (5) is a hydraulic circuit that connects the hydraulic unit (8) with the oil H, chambers (7), (7) partitioned by the piston (6) in the cylinder (1); A servo valve (9) is installed in the middle of (5), and this servo valve (9) is electrically connected to the vibration command signal generator Oυ via a servo amplifier θQ. In addition, in the figure (1) the iron core a is attached to the cylinder rod (3).
There is a differential transformer C connected to the differential transformer aarrz cylinder rod (3), which detects the displacement from the operating neutral point of the differential transformer aarrz cylinder rod (3) and converts it into an electric signal, and uses the displacement δt03 to drive the servo amplifier (1 () Since the sensor can be installed as necessary to correct the position by adjusting the position based on the feedback and automatically ensure the neutral point and amplitude value of the operation, it can also be used in place of other position sensors. good.

In order to perform surface polishing of a workpiece using the device configured in this way, first, the work clip (
4) The workpiece is attached and held manually or using a robot, and the polishing tank (2) containing water and compound as well as Mechia is raised while driving the hydraulic cylinder (1) at high speed. The hydraulic cylinder (1) is lowered together with the cylinder rod (3), and the workpiece is loaded into the media in the polishing tank (2).

On the other hand, in order to drive the δII pressure cylinder (1) at high speed, that is, to vibrate the cylinder rod (3), hydraulic pressure is generated in the hydraulic unit (8) connected to the hydraulic cylinder (1), and this hydraulic pressure is transferred to the hydraulic circuit ( The vibration command signal generator (1) is sent to the servo valve (9) built in the middle of the
The set vibration signal is transmitted from 1) to the two-boot amplifier (11) for a Q-width, which is input to the servo valve (9) to generate hydraulic vibration at the servo valve (9). ] The vibration is transmitted to the hydraulic cylinder (1) to cause the cylinder rod (3) to vibrate in a vertical motion according to the set vibration signal.Thus, the workpiece (a) loaded into the media
Vibrate Wi! ~/00 Hz, total imaging width 0. j
If the cylinder head (3) is directly vibrated under the optimum conditions for the workpiece (A) within a wide range of conditions, such as ~30111ff, the relative relationship between the workpiece (A) and the media will be reduced. Workpiece processed by friction caused by differential motion (a)
Is that surface? After polishing, the workpiece is transferred to a washing tank and washed with water, and then transferred to a rust prevention tank for rust prevention treatment. Note that even if a large number of polishing tanks are installed, the polishing tanks or work grips may be rotated and polished one by one, or the ω1 polishing tank, washing tank, rust prevention tank, etc. may be rotated in the order of the questions in the process order. . Furthermore, the polishing tank can also be photographed, and the rotated υ or workpiece clip can be vibrated while being rotated.

In surface polishing performed in this way, direct vibrations are applied to the workpiece using hydraulic pressure, and as a result, it is possible to use minute media that does not clog the hole, and there is no limit to the depth and shape of the hole. Moreover, it has the advantage of reducing the roughness of the finished surface and making it smooth and uniform even in every corner of the labyrinth hole without the occurrence of secondary cracks. In addition, since it uses hydraulic pressure, the equipment can be used in combination, and the vibration frequency to increase the grinding force can be made very high, making it possible to process in a short time. ] Since it is a direct-acting type that directly vibrates two parts, there is less fatigue damage to the vibrating part of the device, and furthermore,
Since there is no fluctuation in amplitude, it is easy to set machining conditions and has excellent operability. Uniform and constant quality can be obtained for each workpiece. Collisions between workpieces are prevented because each workpiece is fixed independently. Therefore, no dents are caused in the workpiece. Moreover, it is easy to process with high amplitude and high frequency, and since both amplitude and frequency can be adjusted steplessly, conditions suitable for the workpiece can be set, and there are no particular restrictions on the material of the workpiece. It has various advantages, such as being easy to operate and can be integrated into a process line for automation, making it easy to manufacture, reducing the installation area of the device, and lowering manufacturing costs.

In summary, the present invention greatly contributes to the development of the industry as a hydraulic vibratory surface ω1 polishing method and its apparatus which solve the problems of conventional surface polishing methods.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the hydraulic vibration type surface polishing device of the present invention, and FIG. 2 is a partially cutaway side view of the same.
FIG. 3 is a circuit diagram schematically showing a hydraulic circuit and an electric circuit. (1): Oil Lt:, cylinder, (2): Polishing tank,
(3) Niji cylinder rod, (4): Work grip,
(5): Hydraulic circuit, (8): Hydraulic unit, (9): Servo valve, Part: Servo amplifier, 01): Vibration command signal generator, (A): Workpiece.

Claims (1)

[Scope of Claims] / A workpiece is held in a work grip provided on a cylinder rod of a double-acting hydraulic cylinder, and the workpiece is directly vibrated by high-speed drive of the hydraulic cylinder and placed in a polishing tank. 1. A vibrating surface polishing method characterized in that the oil is charged into a contained media to polish the surface of the workpiece. 2. A double-acting hydraulic cylinder provided opposite the polishing tank. A workpiece grip is provided to hold the workpiece on the cylinder rod and loaded into the media in the polishing tank.The hydraulic circuit of the hydraulic cylinder is equipped with a servo valve connected to a vibration command signal generator via a servo amplifier. A hydraulic vibratory surface polishing device characterized by incorporating.