JPH0577127A - Machining pressure control method and device therefor - Google Patents

Abstract

PURPOSE:To optionally regulate the contact pressure of a lapping tool or a grindstone through a work piece and its corresponding object by controlling the weight of a work piece supporting means. CONSTITUTION:The one side of a detachably supporting means is ascendably attached to a fixed table 16. The supporting spring 21 of the detachably supporting means and a supporting force regulating device for the supporting spring 21 (for instance a stepping motor) are interposed between the lower part of the detachably supporting means and a supporting plate 18 for the fixed table 16. Thus, the weight of the detachably supporting means for the workpiece 32 is controlled to control contact pressure between the workpiece 32 and its corresponding object.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing pressure control method for adjusting the contact pressure between a work and a corresponding lap or grindstone in polishing or metal working of jewelry or other brittle materials. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, in the case of processing various materials, it has been a usual method to set the depth of cut and the processing time in advance.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-mentioned conventional processing, processing strains, minute cracks, etc. had a great adverse effect on the processed surface. Further, since the contact pressure is inappropriate, many problems such as deterioration and damage of tools, laps, grindstones, etc. may occur. In the conventional processing method, since only the cutting amount and the processing time are taken into consideration, the processing pressure is hardly taken into consideration, so that it is difficult to perform processing under optimal conditions that are reasonable.

[0004]

SUMMARY OF THE INVENTION However, according to the present invention, the contact pressure between the work and its counterpart (such as a lap or a grindstone) is controlled by controlling the weight of the supporting means for the work and the like. The problem was alleviated so that even an unskilled worker could work with a suitable contact pressure.

That is, the method of the present invention is a machining pressure control method characterized in that the contact pressure between the work and its counterpart is controlled by regulating the weight of the work supporting means.
Further, in order to control the weight of the supporting means, the supporting means is pushed up manually or automatically with a spring interposed. Next, in the device of the present invention, one side of the supporting means is attached to the fixed table so as to be able to move up and down, and between the lower part of the supporting means and the support plate of the fixed table, the supporting spring of the supporting means and the supporting means are provided. The processing pressure control device is characterized in that it is provided with a device for adjusting the support force of the spring. Further, the supporting means includes a movable table which is attached to a fixed table so as to be able to move up and down, an arm whose base end is fixed to the movable table, and a head portion which is attached to an upper end portion at the tip of the arm. Further, the support force adjusting device is a combination of a screw rod for raising and lowering the lower end position of the support spring and a rotating means of the screw rod.

In the above, if the pressure is applied by using another spring in addition to the support spring, the sum thereof becomes the contact pressure. Therefore, even if the support means is relatively light, it is necessary to obtain a predetermined contact pressure. You can Also, instead of using an additional spring, a weight may be placed on the arm to apply pressure. Further, although manual adjustment can be performed by manually rotating the screw rod, automatic adjustment can be performed by rotating the screw rod with the output of a pulse motor or the like.

In the above, when machining is performed with an extremely small machining pressure (for example, 0 to several tens of g), the control becomes uncertain (or inaccurate) due to the swing of the machine, so a damper is installed or control program software is used. It needs to be devised.

The control by the stepping motor enables highly accurate control.

For example, in the case of 500 pulses / revolution, if the gear ratio is 24:80 and the feed screw lead is 1 mm, the displacement position of the spring per pulse is 0.6 × 10 ^-3 mm. Therefore, total weight Pmax = 3Kg, spring constant 1Kg / mm
If so, the amount of change Pμ per pulse is Pg = 1.8 g, so that it can be said that the accuracy is practically sufficient.

The work mentioned above is a brittle material such as jewelry or a diamond bite. However, it can also be applied to the adjustment of the contact pressure of a tool during metal working.

[0011]

According to the present invention, the contact pressure of the work is controlled by regulating the total weight of the support means for the work, so that the contact pressure can be arbitrarily selected up to a predetermined pressure higher than zero. However, by controlling the weight with screws and springs,
Can be stepless and smooth.

In addition to manual operation, automatic and highly accurate control (for example, fine rotation of a screw using a pulse motor) can be performed.

[0013]

EXAMPLE A machine body 2 is installed on a table 1, and a gear 3 is fixed to the upper outside of the machine body 2. A rocking plate 4 is attached to the upper end surface of the machine body 2 so as to freely rotate on the water surface, and a rocking motor 5 is vertically fixed to a lower part of one side of the rocking plate 4, and a shaft 6 thereof is projected upward so that a shaft 6 Fix the pulley 7 to the protruding part,
Applies a timing belt to a pulley 9 fixed to a vertical axis 8 rotatably installed on the rocking plate 4, and the lower side of the vertical axis 8 projects to the lower surface of the rocking plate 4, The gear 10 is fixed, and the gear 10 and the gear 3 are engaged with each other. A fixed bracket 11 is provided on the other side of the swing plate 4.
Is vertically fixed, the cutting motor 12 is vertically installed on the upper part of the fixed bracket 11, and a ball screw 15 is connected to the shaft 13 via a coupling 14, and the ball screw 15 is rotated to the fixed bracket 11. It is erected freely and screwed to the fixed table 16. One side of the fixed table 16 is fitted to the one side of the fixed bracket 11 so as to be movable up and down.
One side of the moving table 17 is fitted to the other side so as to be able to move up and down. Further, the support plate 1 is provided below the fixed table 16.
8 is horizontally projected toward the moving table 17 side, a screw cylinder 20 is fixed to the support plate 18, and the screw cylinder 1 is screwed into the screw cylinder 20.
9 is screwed so as to be movable up and down, and a receiving plate 22 of a support spring 21 is rotatably attached to the upper end of the screw rod 19. The spring 21 is interposed between the receiving plate 22 and the spring contact plate 23 on the lower surface of the moving table 17.

The stepping motor 2 is mounted on the support plate 18.
4 is fixed vertically, and a gear 26 fixed to the shaft 25 of the stepping motor 24 and a gear 27 fixed to the screw rod 19 are engaged with each other.

The arm 2 is provided on the other side of the moving table 17.
One side of the vertical rod 29 is fixed in the horizontal direction, the upper end of the vertical rod 29 is fixed to the other side of the arm 28, and the work 32 is fixed to the lower portion of the vertical rod 29 via a stake 31 and a tractor 30.

A mounting plate 3 is provided on the upper end of the moving table 17.
3 is fixed, a touch position adjusting screw 34 is screwed to the other side of the mounting plate 33, and the lower end of the adjusting screw 34 is
The upper end of the touch sensor 35 fixed to the fixed table 16 is opposed.

In the above embodiment, if a predetermined sequence is stored in the stepping motor 24, the stepping motor 24 rotates and the gear 27 rotates via the gear 26 in accordance with each processing step. Depending on the direction of rotation, the screw rod 19 moves up or down as indicated by arrows 36 and 37. For example, when the screw rod 19 is lifted, the pushing force of the spring 21 (on the platen 23) is increased, and therefore the total weight of the moving table 17, the arm 28, the vertical rod 29, the tractor 30 and the stick 31 is added to the support spring 2
The amount obtained by subtracting the pushing force by 1 is the contact pressure applied to the work. In this way, the contact pressure can be controlled by the rotating direction of the shaft of the stepping motor 24.

If the pressure spring 21a is installed above the moving table 17 and the moving table is pressed down by the spring, the sum of the weight of each part of the supporting means and the pressing force of the spring becomes the contact pressure of the tool, resulting in a large contact. It is also possible to take pressure.

In FIG. 2, when the moving table is pushed up, there is a point at which the stopper 38, which was in contact with the moving table, is released. Ideally, this point and the point at which the touch sensor 35 separates coincide with each other. However, if the control is performed too tightly at this time, the sensor is repeatedly turned on and off and the operation becomes unstable. Therefore, the touch sensor 35 is adjusted so that it is touching for a long time. The difference at this time is called "deviation".

When a preset pulse is sent to the stepping motor, the cutting feed, that is, the 2 feed is stopped, and the machining ends when the touch sensor is turned on. Therefore, the "deviation" affects the finished size of the machining. Will affect. This problem can be solved by setting a time for zero machining in order to absorb the “deviation”. 2 When the feed stops and the touch sensor turns on, the timer works and zero processing is continued, and everything is hunted at the time up, but the timer is set so that the stopper works during this time.

In addition to the above, by using a pressure sensor, a linear gauge, etc., it is possible to bring the "deviation" to zero as close as possible. Therefore, polishing or the like can be performed with a delicate processing pressure.

The present invention automatically controls the working contact pressure. In general, there are many cases where processing is performed while maintaining a constant pressure, but there are also cases where the processing is changed as shown in FIGS. In such a case, by inputting the program of pressurizing contact pressure to the control system in advance,
Accurate control is possible.

[0023]

The present invention has the effect that the weight of the support means for the work is regulated and the contact pressure between the work and its counterpart (lap or grindstone) can be adjusted arbitrarily. Also, one side of the bearing means is attached to the fixed table so as to be able to move up and down, a bearing spring of the bearing means is interposed between the lower portion of the bearing means and the support plate of the fixed table, and the bearing spring is also supported to the lower portion of the bearing spring. Since the force adjusting device is installed, the total weight of the supporting means is controlled by the adjusting device (manual or automatic), and thus the contact pressure can be adjusted.

Therefore, regardless of the skill level of the operator, a suitable contact pressure can be maintained and uniform processing can be easily carried out.

[Brief description of drawings]

FIG. 1 is a front view in which a part of an embodiment of the present invention is omitted.

FIG. 2 is a side view with a part thereof omitted.

FIG. 3 is an exemplary graph showing a relationship between processing pressure and time.

FIG. 4 is an exemplary graph showing the relationship between processing pressure and time.

FIG. 5 is an exemplary graph showing the relationship between processing pressure and time.

FIG. 6 is an exemplary graph showing the relationship between processing pressure and time.

[Explanation of symbols]

 1 Table 2 Aircraft 4 Swing Plate 5 Swing Motor 11 Fixed Bracket 12 Cutting Motor 15 Ball Screw 16 Fixed Table 17 Moving Table 18 Bearing Plate 21, 21a Spring 22 Receptor Plate 23 This Plate 24 Stepping Motor 30 Protractor 31 Stick 32 Work piece 33 Mounting plate 34 Adjustment screw 35 Touch sensor

Claims (5)

[Claims] 1. A machining pressure control method characterized in that the contact pressure between a work and its counterpart is controlled by regulating the weight of a work supporting means. 2. The processing pressure control method according to claim 1, wherein in order to regulate the weight of the supporting means, the supporting means is pushed up manually or automatically with a spring interposed. 3. A support spring of the support means and a support spring of the support spring are mounted between a lower portion of the support means and a support plate of the fixed table while vertically attaching one side of the support means to a fixed table. A processing pressure control device characterized by being interposed with a support force adjusting device. 4. The support means is a moving table mounted on a fixed table so as to be able to move up and down, an arm having a base end fixed to the moving table, and a head part having an upper end attached to the tip of the arm. Processing pressure control device. 5. The machining pressure control device according to claim 3, wherein the support force adjusting device includes a screw rod for raising and lowering the lower end position of the support spring, and a rotating means for the screw rod.