TWM661160U - Workpiece clamping control system for processing machines - Google Patents

Abstract

A workpiece clamping control system for a processing machine is applied to the high and low pressure switching control of the workpiece clamping of the processing machine. Its features include a hydraulic control module connected to the spindle mechanism. The hydraulic control module includes a high and low pressure switching hydraulic circuit and a hydraulic cylinder. The hydraulic cylinder is connected to the spindle mechanism and switches to a high and low pressure oil circuit through a controller, so that the hydraulic cylinder provides different working pressures to drive the spindle mechanism to clamp the workpiece for different processing processes. With this design, the effect of clamping the workpiece in a consistent manner for two-stage processing (such as roughing and finishing) is achieved in one go.

Description

Workpiece clamping control system for processing machines

This creation involves a processing machine clamping technology that can switch the working pressure of the hydraulic cylinder.

According to the Swiss lathe, the tool is fixed and the spindle is movable so that the workpiece to be processed can be moved. The existing Swiss lathe has a main spindle and a secondary spindle. The Swiss lathe clamps the workpiece by the main spindle for the first processing, and when the workpiece needs to be processed for the second time, the work axis moves and the rotary cylinder is used to clamp the workpiece to the secondary spindle for the second processing.

Among them, the workpiece to be processed for the first time is usually solid, and the main spindle needs to clamp the workpiece with a larger clamping force (heavy clamping). The workpiece to be processed for the second time is usually changed from solid to hollow, so the sub-spindle needs to clamp the workpiece with a smaller clamping force (light clamping) to avoid deformation and damage of the workpiece.

However, existing Swiss-type lathes only have one hydraulic controller and only use a single hydraulic circuit to provide pressure to both the main spindle and the sub-spindle to clamp the workpiece. Therefore, when the workpiece is transferred from the main spindle to the sub-spindle for secondary processing, the single hydraulic circuit needs to switch from providing high pressure to the main spindle to providing low pressure to the sub-spindle. In addition to the buffer time of the pressure conversion process being very time-consuming and affecting the processing efficiency, the pressure range provided by the single hydraulic circuit is also limited, and it cannot provide a smaller pressure to the sub-spindle to clamp the workpiece, which may cause damage and deformation of the workpiece.

Therefore, a patent like Taiwan Patent No. I824791 "Clamping Control System for Processing Machine" was developed. The patent features are: a hydraulic control device, a main spindle and a secondary spindle are provided; the hydraulic control device has a first hydraulic cylinder, a second hydraulic cylinder, a first controller and a second controller, the first controller is used to control a main spindle pressure of the first hydraulic cylinder, the second controller is used to control a secondary spindle pressure of the second hydraulic cylinder, the secondary spindle pressure includes an opening pressure and a clamping pressure, the clamping pressure is less than or equal to the opening pressure. Pressure; the first hydraulic cylinder provides the main spindle with spindle pressure to clamp an original workpiece and perform a first process to form a processed workpiece; the second hydraulic cylinder provides the sub-spindle with sub-spindle pressure to clamp the processed workpiece and perform a second process; through the first controller and the second controller, the spindle pressure provided to the main spindle and the sub-spindle pressure provided to the sub-spindle can be controlled respectively through different hydraulic circuits. When the workpiece is transferred from the main spindle to the sub-spindle for the second process, the buffer time of pressure conversion is saved to improve the processing efficiency.

When the hydraulic pressure of the aforementioned center-type processing machine is switched, the required hydraulic pressure needs to be readjusted and the processed object needs to be removed and re-clamped. For factories with intelligent production, the processing time needs to be effectively optimized, so the control structure of the clamping pressure of the processing machine needs to be further improved, which is what the industry is eager to break through.

In order to solve the above-mentioned shortcomings of the existing technology, the main purpose of this invention is to provide a workpiece clamping control system for a processing machine, which uses the design of a hydraulic pressure switching circuit that can change to higher and lower pressures to provide different working pressures, and can perform two-stage processing in one go, in order to overcome the difficulties in the existing technology.

Technical means to solve the problem. To achieve the above purpose, this invention provides a workpiece clamping control system for a processing machine, which is applied to the high and low pressure switching control of the workpiece clamping of the processing machine. Its features include a hydraulic control module connected to the spindle mechanism. The hydraulic control module includes a high and low pressure switching hydraulic circuit and a hydraulic cylinder. The hydraulic cylinder is connected to the spindle mechanism and switches to a high and low pressure oil circuit through a controller, so that the hydraulic cylinder provides different working pressures to drive the spindle mechanism to clamp the workpiece for different processing processes. With this design, the effect of a one-time clamping of the workpiece for two-stage processing (such as roughing and finishing) is achieved.

The hydraulic switching circuit includes a switching control valve, a clamping control valve, a release control valve and a throttling valve.

The hydraulic switching circuit further includes a flow limiting valve, which provides hydraulic flow limitation for the hydraulic switching circuit, and can increase the switching stability of the hydraulic cylinder, thereby ensuring that the hydraulic flow is limited and the pressure is gradually released after the low-pressure clamping workpiece is finely processed, so as not to cause the workpiece to fall.

The hydraulic switching circuit further includes a high-pressure regulating rod and a low-pressure regulating rod connected to the switching control valve.

The hydraulic control module can switch between high and low pressures within a range of 5 to 30 kg/cm ² .

1: Spindle mechanism

2: Hydraulic pressure control module

21: Hydraulic switching circuit

211: Switch control valve

212: Clamping control valve

213:Relax control valve

214: Throttle valve

215: High pressure adjustment lever

216: Low pressure adjustment lever

217: Flow limiting valve

22: Hydraulic cylinder

3: Controller

Figure 1: Schematic diagram of the structure of this creation.

Figure 2: Schematic diagram of the structure of this creation.

The third picture is a schematic diagram of the hydraulic control module of this creation.

Figure 4: A schematic diagram of the hydraulic control module from another angle.

Figure 5: This is the oil circuit configuration diagram of each control valve in the high and low oil pressure switching circuit of this creation.

This invention is described in detail below with accompanying drawings and in the form of an embodiment. The drawings used in this article are only for illustration and auxiliary description, and may not be the actual proportion and precise configuration of this invention after implementation. Therefore, the proportion and configuration of the attached drawings should not limit the patent scope of this invention in actual implementation. This should be stated in advance.

Please refer to the first and second figures for the structure diagram of this creation, and the third and fourth figures for the appearance diagram of the hydraulic control module of this creation. The workpiece clamping control system of this processing machine mainly includes:

A spindle mechanism (1) for clamping a workpiece;

A hydraulic control module (2) connected to the spindle mechanism (1), comprising a hydraulic switching circuit (21) capable of switching between high and low pressures and a hydraulic cylinder (22), wherein the hydraulic cylinder (22) is connected to the spindle mechanism (1) and supplies hydraulic pressure to drive the spindle mechanism (1) to clamp the workpiece;

A controller (3) is connected to the hydraulic control module (2) and controls the hydraulic switching circuit (21) to switch to supply a high hydraulic pressure to the hydraulic cylinder (22), so that the spindle mechanism (1) clamps the workpiece with high pressure to perform the first process (rough machining), or switches to supply a low hydraulic pressure to the hydraulic cylinder (22), so that the spindle mechanism (1) clamps the workpiece with low pressure to perform the second process (finishing machining).

In addition to the above features, the hydraulic switching circuit (21) includes a switching control valve (211), a clamping control valve (212), a release control valve (213) and a throttle valve (214). Please refer to Figure 5 for the valve configuration diagram of the hydraulic circuit of this invention. The hydraulic cylinder (22) is provided with an A port and a B port, and the switching The control valve (211) is provided with a low-pressure end a1 and a high-pressure end b1, the clamping control valve (212) is provided with a clamping end a2 and a return end b2, the release control valve (213) is provided with a release end a3 and a return end b3, and the throttling valve (214) is provided with a throttling end a4 and a non-throttling end b4; the actual operation process is described by the following steps:

The first step 1 is that when the spindle mechanism (1) clamps the workpiece with high pressure, the high pressure is controlled by the B port of the hydraulic cylinder, so that the A port of the hydraulic cylinder controls the oil supply through the clamping end a2 of the clamping control valve (212), the B port of the hydraulic cylinder controls the return flow through the return end b3 of the release control valve (213), and the B port of the hydraulic cylinder quickly returns the oil through the non-throttling end b4 of the throttling valve (214), so that the spindle mechanism (1) clamps the workpiece with high pressure to perform the first process of rough machining.

In addition, the hydraulic switching circuit (21) further includes a high-pressure adjusting rod (215) and a low-pressure adjusting rod (216) connected to the switching control valve (211). The high-pressure adjusting rod (215) corresponds to adjusting the high hydraulic pressure supplied by the hydraulic cylinder (22) to the spindle mechanism (1), such as adjusting the high hydraulic pressure (clamping force) corresponding to the rough machining of the first process, and the low-pressure adjusting rod (216) corresponds to adjusting the low hydraulic pressure supplied by the hydraulic cylinder (22) to the spindle mechanism (1), that is, when switching to low pressure, the low hydraulic pressure (clamping force) of the finishing process of the second process can be adjusted.

When switching to low pressure in step 2, the low pressure is controlled by the port A of the hydraulic cylinder, and the port A of the hydraulic cylinder controls the oil supply through the clamping end a2 of the clamping control valve (212), and the port B of the hydraulic cylinder controls the return flow through the return end b3 of the release control valve (213), and the port A of the hydraulic cylinder returns the oil through the throttling end a4 of the throttling valve (214), thereby switching to low pressure oil supply and throttling oil return; the next step 3 is to allow the main shaft The mechanism (1) switches to stop oil supply, that is, the hydraulic cylinder A port controls the low pressure, and the hydraulic cylinder B port controls the return oil through the return end b2 of the clamping control valve (212), and the hydraulic cylinder A port controls the release end a3 of the release control valve (213) to release, and the hydraulic cylinder A port returns oil through the throttle end a4 of the throttle valve (214), so that the main shaft mechanism (1) is relaxed and switched to low pressure oil supply.

Then, in step 4, the main shaft mechanism (1) is relaxed and switched to stop oil supply, that is, the port A of the hydraulic cylinder controls the low pressure, and the port A of the hydraulic cylinder controls the oil supply through the clamping end a2 of the clamping control valve (212), and the port B of the hydraulic cylinder controls the return flow through the return end b3 of the release control valve (213), and the port A of the hydraulic cylinder returns the oil through the throttle end a4 of the throttle valve (214), so that the main shaft mechanism (1) is clamped and switched to low pressure oil supply; finally, in step 5, the hydraulic cylinder controls the low pressure oil supply through the clamping end a2 of the clamping control valve (212), and the port B of the hydraulic cylinder controls the return flow through the return end b3 of the release control valve (213), and the hydraulic cylinder controls the return flow through the throttle end a4 of the throttle valve (214), so that the main shaft mechanism (1) is clamped and switched to low pressure oil supply; finally, in step 5, the hydraulic cylinder controls the low pressure oil supply through the clamping end a2 of the clamping control valve (212), and the release control valve (213) controls the return flow through the return end b3 of the release control valve (213), and the release control valve (213) controls the return flow through the return end b3 of the throttle valve (214 ... The port A of the hydraulic cylinder controls the low pressure, allowing the port A of the hydraulic cylinder to supply oil by controlling the clamping end a2 of the clamping control valve (212), and the port B of the hydraulic cylinder controls the return flow at the return end b3 of the release control valve (213), and the port B of the hydraulic cylinder quickly returns oil through the non-throttling end b4 of the throttling valve (214), and then through pressure detection, the high pressure switching to low pressure action is completed; further, the pressure range of the high and low pressures that can be switched in the hydraulic control module (2) is 5 to 30 kg/ ^cm2 .

In addition, the hydraulic switching circuit (21) further includes a flow limiting valve (217), which provides hydraulic flow limitation for the hydraulic switching circuit (21). After switching to low-pressure clamping for finishing in the above steps 4-5, the hydraulic flow is slowly returned through the hydraulic flow limitation of the flow limiting valve (217), which can ensure that the switching stability of the hydraulic cylinder (22) can be increased when switching between high and low hydraulic pressures. At the same time, after the finishing of the low-pressure clamping workpiece is completed, the hydraulic flow is limited and the pressure is gradually released, and the clamped workpiece is gradually released so that the workpiece will not fall.

The advantages of this creation are:

1. The hydraulic pump introduces hydraulic pressure through the P port, and the hydraulic pressure is simultaneously supplied to the high-pressure adjustment rod and the low-pressure adjustment rod. The hydraulic pressure is then switched through the switching control valve, and the clamping control valve and the release control valve control the hydraulic cylinder A port and B port to actuate. In this way, a controller can be used to switch between high and low pressure oil circuits, so that the hydraulic cylinder can provide different working pressures to drive the spindle mechanism to clamp the workpiece for different processing processes. With this design, the effect of clamping the workpiece in a consistent manner for two-stage processing (such as roughing and finishing) can be achieved in one go.

2. Use a flow limiting valve in the hydraulic switching circuit to limit the hydraulic flow of the hydraulic switching circuit. In addition to increasing the switching stability of the hydraulic cylinder, it also ensures that the hydraulic flow can be limited and the pressure can be released slowly after the low-pressure clamping workpiece is finished, so that the workpiece can be released slowly without the loss of traditional workpieces falling.

From the above, we can see that this creation has indeed achieved the desired improvement by breaking through the previous technical structure, and it is not easy for people familiar with the technology to think of. Moreover, this creation has not been disclosed before the application. Its progressiveness and practicality obviously meet the application requirements of the creation patent. Therefore, I have filed a creation patent application in accordance with the law. I sincerely request that your office approve this creation patent application to encourage creation. I am grateful.

The implementation examples described above are only for illustrating the technical ideas and features of this creation. Their purpose is to enable people familiar with this art to understand the content of this creation and implement it accordingly. They cannot be used to limit the patent scope of this creation. In other words, any equal changes or modifications made according to the spirit revealed by this creation should still be covered by the patent scope of this creation.

21: Hydraulic switching circuit

211: Switch control valve

212: Clamping control valve

213:Relax control valve

214: Throttle valve

215: High pressure adjustment lever

216: Low pressure adjustment lever

217: Flow limiting valve

22: Hydraulic cylinder

Claims (5)

A workpiece clamping control system for a processing machine, which mainly includes: A spindle mechanism for clamping the workpiece; A hydraulic control module connected to the spindle mechanism, which includes a hydraulic switching circuit capable of switching between high and low pressures and a hydraulic cylinder, and the hydraulic cylinder is connected to the spindle mechanism and supplies hydraulic pressure to drive the spindle mechanism to clamp the workpiece; A controller is connected to the hydraulic control module and controls the hydraulic switching circuit to switch to supply a high hydraulic pressure to the hydraulic cylinder so that the spindle mechanism clamps the workpiece with high pressure to perform the first process, and switches to supply a low hydraulic pressure to the hydraulic cylinder so that the spindle mechanism clamps the workpiece with low pressure to perform the second process. The workpiece clamping control system of the processing machine as described in claim 1, wherein the hydraulic switching circuit includes a switching control valve, a clamping control valve, a release control valve and a throttle valve, wherein the switching control valve is controlled by the controller to switch between high oil pressure and low oil pressure, and the clamping control valve and the release control valve are used to control the oil supply of the hydraulic cylinder for clamping or oil return for release, and the throttle valve is used to control the rapid oil return of the hydraulic cylinder. The workpiece clamping control system of the processing machine as described in claim 2, wherein the hydraulic switching circuit further includes a flow limiting valve, and the flow limiting valve provides the hydraulic switching circuit with a flow limit to control the hydraulic cylinder to maintain stable switching. The workpiece clamping control system of the processing machine as described in claim 2, wherein the hydraulic switching circuit further includes a high-pressure adjusting rod and a low-pressure adjusting rod connected to the switching control valve, the high-pressure adjusting rod correspondingly adjusts the high hydraulic pressure supplied by the hydraulic cylinder to the spindle mechanism, and the low-pressure adjusting rod correspondingly adjusts the low hydraulic pressure supplied by the hydraulic cylinder to the spindle mechanism. A workpiece clamping control system for a processing machine as described in claim 4, wherein the pressure range of high and low pressure switchable in the hydraulic control module is 5 to 30 kg/cm ² .

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