Fluid power control device for thermos cup polishing machine

Abstract

The present invention provides a fluid power force control device for a thermos cup polishing machine, which mainly includes an actuating mechanism, an adjusting mechanism, a sliding mechanism, and a main motion mechanism. The concept of bionic design is adopted to imitate the control method of polishing force in manual polishing. Accordingly, the machine is easy to operate. The size of the mechanical force can be controlled by adjusting the pressure regulating valve in the adjusting mechanism. The structure is simple, and different mechanical forces can be selected in real time. Different forces can be adjusted according to different cup shapes (curved segments or straight segments) or different process steps. The force control effect is good, and the workpieces of the same batch with large tolerances can be polished, avoiding over-polishing and under-polishing, and increasing the yield of the polishing process. The machine is suitable for high-speed polishing, avoiding resonance and other situations that affect the processing accuracy.

Description

Technical Field

[0001] The invention relates to polishing processing equipment, in particular to a force control device for a thermos cup polishing machine. Background Art

[0002] The intelligent special-shaped thermos cup polishing machine forms a polishing path through teaching (or writing CNC code). It can process thermos cups with a shape tolerance within ±0.2mm well, and the processing consistency and efficiency are better than manual.

[0003] However, since the thermos cup is a thin-walled product, many low-end thermos cups do not have a good control of the production process in the front-end processing to control the precision of the semi-finished products, and the processing error is large. In the polishing process, the shape tolerance of cups of the same shape can reach 2~3mm, and even the naked eye can see the obvious difference in shape. If the polishing path is completely based on the CNC trajectory, some low-end cups with large tolerances will not be polished or over-polished. After a batch, the proportion of completely successful polishing is relatively low. If you blindly require to increase the shape tolerance requirements of each batch under the existing front-end production conditions, it will inevitably increase the inspection time, and increase the batches, teaching or programming time.

[0004] How to use the same CNC machining path data to polish a batch of thermos cup semi-finished products (thin-walled rotating bodies) with a larger shape tolerance (for example, ±1mm) so that the CNC system has a wider adaptability has become a technical problem that the present invention needs to solve.

[0005] The inventor adopted the concept of bionic design and imitated the control method of polishing force in manual polishing to develop a set of thermos cup polishing machine force control device with a spring as the force control device (Chinese patent application number 201910183416.4 and 201920307425.5). This set of thermos cup polishing machine force control device can effectively reduce the defective rate of thermos cup polishing. However, the following problems were found in the experiment:

[0006] 1. The spring system has a natural frequency, which generates resonance when the spindle is polished at high speed, thereby limiting the high-speed polishing of the thermos cup polishing machine and preventing the polishing efficiency from being improved.

[0007] 2. Research shows that different polishing forces are required for curved and straight segments. The same force may result in partial burnishing or incomplete polishing. After the spring force is adjusted, it is difficult to adjust the force as the shape of the cup changes. Basically, the spring force control device is suitable for the automatic polishing of the thermos cup with a straight segment. The spring force control device is structurally difficult to adjust the force in real time during the polishing process.

[0008] 3. When the polishing machine is in the sand rib process of the thermos cup, the polishing force required is different. Although the machine can be stopped to adjust the spring force due to different processes, the degree of automation of the thermos cup polishing is also reduced. Summary of the invention

[0009] In order to solve the above technical problems, the present invention provides a fluid power force control device for a thermos cup polishing machine, which aims to avoid the resonance phenomenon of the force control device when the spindle runs at high speed during the CNC polishing process. The force control device can realize real-time adjustment of the polishing force, thereby improving the working efficiency of the polishing machine and the yield rate after automatic polishing (reducing over-polishing or under-polishing caused by inappropriate polishing force, as well as unnecessary downtime waiting and manual intervention).

[0010] The polishing machine processes the outer surface of a rotating body with thin walls and large shape tolerance.

[0011] The X-axis, Y-axis and Z-axis are defined in a rectangular coordinate system, and the three axes are perpendicular to each other.

[0012] In order to achieve the above object, the present invention provides a fluid power control device for a thermos cup polishing machine, comprising:

[0013] An actuating mechanism capable of generating a mechanical force through fluid pressure;

[0014] an adjusting mechanism, the adjusting mechanism being used to adjust the magnitude of the mechanical force generated by the actuating mechanism;

[0015] a sliding mechanism connected to the actuating mechanism, and used for driving a workpiece or a tool to slide along an axial direction;

[0016] A main motion mechanism provides the main motion of the workpiece or the tool according to the position data of the numerical control machining.

[0017] Preferably, the actuating mechanism includes a plunger cylinder, a fluid source, and a selection valve.

[0018] Preferably, the adjustment mechanism includes a pressure regulating valve, the fluid source is divided into N fluid branches in parallel, N is greater than or equal to two, the number of the pressure regulating valves is equal to N, and each of the pressure regulating valves is installed on each of the fluid branches. N is a natural number.

[0019] Preferably, the adjustment mechanism includes a pressure regulating valve, the fluid source is divided into N fluid branches in parallel, N is greater than or equal to two, the number of the pressure regulating valves is equal to N-1, and each of the pressure regulating valves is installed on N-1 of the fluid branches.

[0020] Preferably, the selection valve comprises N selection passages, each of which is connected to each of the fluid branches, and each of which is connected to the plunger cylinder.

[0021] Preferably, the selection valve comprises an N-position solenoid valve or an N+1-position solenoid valve, and the N-position solenoid valve or the N+1-position solenoid valve drives the solenoid valve to connect one of the selection passages and close the other selection passages according to a numerical control machining program.

[0022] Preferably, the selector valve comprises N switch solenoid valves, which drive the solenoid valves to connect one of the selected passages and close the other selected passages according to the numerical control machining program. The switch solenoid valve is a two-position, two-position normally closed solenoid valve. Alternatively, the switch solenoid valve is a two-position, two-position normally open solenoid valve.

[0023] Preferably, the sliding mechanism includes a guide rail and a slider, the guide rail is connected to the main motion mechanism, the slider is slidably connected to the guide rail, the slider is connected to a main seat plate, the main seat plate is connected to the workpiece or the tool, the plunger cylinder has a cylinder body and a plunger, the main motion mechanism is connected to a cylinder body mounting seat, the cylinder body is fixedly connected to the cylinder body mounting seat, the main seat plate includes a limit block 1, the plunger abuts against or is fixedly connected to the limit block 1, and the axis of the plunger is parallel to the movement direction of the guide rail.

[0024] Preferably, the guide rail is a ball guide rail.

[0025] Preferably, the main motion mechanism is further provided with a second limiter, the second limiter and the first limiter block are used to limit the sliding range of the slider, and the second limiter includes a protrusion or a groove.

[0026] Preferably, it also includes a fuselage, and the main motion mechanism includes a circular plate, which rotates around the Z axis relative to the fuselage, slides along the X axis, and moves along the Y axis. The movement of the circular plate relative to the fuselage is controlled by the position data of CNC machining, and the sliding mechanism is installed on the circular plate.

[0027] The fluid source is compressed gas. The fluid source includes an air filter, a pressure reducing valve, or the air filter and the pressure reducing valve are combined into a two-piece. If lubrication is required, the fluid source also includes an oil mist device, or the air filter, the pressure reducing valve and the oil mist device are combined into a three-piece device.

[0028] The fluid source is hydraulic oil with a certain pressure.

[0029] Compared with the prior art, the present invention provides a fluid power control device for a thermos cup polishing machine, which mainly includes an actuating mechanism, an adjusting mechanism, a sliding mechanism, and a main motion mechanism. The concept of bionic design is adopted to imitate the control method of polishing force in manual polishing. Accordingly, the machine is easy to operate. The size of the mechanical force can be controlled by adjusting the pressure regulating valve in the adjusting mechanism. The structure is simple, and different mechanical forces can be selected in real time. Different forces can be adjusted according to different cup shapes (curved segments or straight segments) or different process steps. The force control effect is good, and the workpieces of the same batch with large tolerances can be polished, avoiding over-polishing and under-polishing, and increasing the yield of the polishing process. It is also suitable for high-speed polishing, avoiding resonance and other conditions that affect the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a stereoscopic diagram of an embodiment of the fluid power control device of the thermos cup polishing machine of the present invention.

[0031] Figure 2 This is a three-dimensional diagram of an embodiment of a fluid power control device for a thermos cup polishing machine of the present invention installed on a partial mechanism of the polishing machine.

[0032] Figure 3 It is a schematic diagram of an embodiment of a fluid power control device for a thermos cup polishing machine of the present invention.

[0033] Figure 4a It is a schematic diagram of an embodiment of the fluid pipeline connection in the fluid power control device of the thermos cup polishing machine of the present invention.

[0034] Figure 4b It is a schematic diagram of another embodiment of the fluid pipeline connection in the fluid power control device of the thermos cup polishing machine of the present invention.

[0035] Figure 4c It is a schematic diagram of another embodiment of the fluid pipeline connection in the fluid power control device of the thermos cup polishing machine of the present invention.

[0036] Figure 5 It is an embodiment of an N-position solenoid valve or an N+1-position solenoid valve in the fluid power control device of the thermos cup polishing machine of the present invention.

[0037] Figure 6 It is a partial cross-sectional view of an embodiment of the second limiter in the fluid power control device of the thermos cup polishing machine of the present invention.

[0038] Description of Figure Numbers.

[0039] Actuating mechanism 1

[0040] Plunger cylinder 11

[0041] Cylinder 111

[0042] Plunger 112

[0043] Fluid source 12

[0044] Compressed gas source 12a

[0045] Triple piece 12a1

[0046] Fluid branch 121

[0047] Selector valve 13

[0048] Choose one of the channels 131

[0049] N position solenoid valve 132a

[0050] Switch solenoid valve 132b

[0051] Adjustment mechanism 2

[0052] Pressure regulating valve 21

[0053] Sliding mechanism 3

[0054] Guide Rail 31

[0055] Ball guide 31a

[0056] Slider 32

[0057] Main seat plate 33

[0058] Limit block 331

[0059] Main motion mechanism 4

[0060] Limit 2 41

[0061] Round plate 42

[0062] Cylinder mounting seat 43

[0063] Artifact 51

[0064] Tool 52

[0065] Body 6. DETAILED DESCRIPTION

[0066] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0067] Most of the surfaces of thermos cups are revolving surfaces, which are curved surfaces formed by the rotation of the generatrix around the axis. According to this characteristic, the axis and generatrix of the revolving surface can be determined to completely restore the revolving surface. Polishing tools are usually also revolving bodies (basically cylinders).

[0068] like Figure 1As shown, a stereoscopic diagram of a fluid power control device for a thermos cup polisher is shown in a right-angle coordinate system (X axis, Y axis, Z axis). The present invention provides a fluid power control device for a thermos cup polisher, comprising an actuating mechanism 1, which can generate a mechanical force through fluid pressure, and the mechanical force is parallel to the main cutting force between a workpiece 51 and a tool 52 (not shown in the figure, the blank space to be installed in this embodiment is the workpiece 51); an adjusting mechanism 2, which is used to adjust the size of the mechanical force generated by the actuating mechanism 1, so as to realize the automatic adjustment of the processing force according to different process requirements and different shapes (curve segments, straight line segments) during the automated processing; and a sliding mechanism 3, which is connected to the actuating mechanism 1. As shown in the figure, the connection method is: some parts of the actuating mechanism 1, such as blocking, are connected to a fixed limit block 331 on the sliding mechanism 3 through a thread. Alternatively, the plunger of the actuating mechanism 1 abuts against a fixed limit block 331 on the sliding mechanism 3. The actuating mechanism 1 pushes the sliding mechanism 3 to move, and the sliding mechanism 3 is used to drive the workpiece 51 or the tool 52 to slide along an axial direction. From a processing plane, the workpiece 51 and the tool 52 can be in better contact at the polishing point and have better cutting force; the main motion mechanism 4, the main motion mechanism 4 provides the main motion of the workpiece 51 or the tool 52 according to the position data of the CNC processing. Therefore, the main motion mechanism 4 is fixedly connected to the execution component of the original CNC drive (main program), so as to follow the movement of the original execution component (main motion). However, relatively speaking, the movement or force generated by the sliding mechanism 3 and the like in the force control device relative to the main motion mechanism 4 is auxiliary and small, and is a secondary motion. Combined with the main motion, it improves the automation degree of automatic polishing and the yield rate of the finished product.

[0069] from Figure 2 A stereogram showing the fluid power control device of the thermos cup polisher installed on a part of the polisher is shown. The final composite motion of the polisher, i.e., rotation around the Z axis, sliding along the X axis, and motion along the Y axis, is realized on the main motion mechanism 4.

[0070] See also Figure 4a-4c As shown in the figure, the actuator 1 includes a plunger cylinder 11, a fluid source 12, and a selector valve 13. The fluid source 12 shown in the figure is a compressed gas source 12a, which is processed into a clean, lubricated compressed gas A at a working pressure through a triplet 12a1. The triplet 12a1 includes an air filter, a pressure reducing valve, and an oil mist collector. At present, there is no need for lubrication in the air transmission line, and the triplet 12a1 can be replaced by a two-piece including an air filter and a pressure reducing valve.

[0071] The adjustment mechanism 2 includes a pressure regulating valve 21, and the compressed gas A is divided into compressed gases A1 ... AN in parallel. In this embodiment, N=3.

[0072] Figure 4a As shown in FIG. 1 , the number of pressure regulating valves 21 is N-1. The compressed gas AN is directly output as a compressed gas BN (pressure value equal to AN) without passing through the pressure regulating valve. The compressed gases A1..., A(N-1) are respectively adjusted by the pressure regulating valves 21 (1...N) to produce a compressed gas B1..., B(N-1) with stable air pressure.

[0073] The selector valve 13 is N switch solenoid valves 132b, which are two-position, two-position normally closed solenoid valves. Compressed gases B1..., BN are connected to switch solenoid valves 132b (1...N) respectively. These switch solenoid valves 132b are normally closed when de-energized, and are connected when energized. By setting the power on and off of the solenoid valves in the program, the gas path of the corresponding pressure gas is selected, and a channel of a gas path is a one-selection passage 131. The compressed gas C (one of C1,..., CN) output after the selector valve.

[0074] The switch electromagnetic valve 132b can also be a two-position, two-position normally open electromagnetic valve. When the electromagnetic valve in a certain gas path loses power, the switch electromagnetic valve 132b is connected, and the gas path is connected.

[0075] The compressed gas C is connected to the plunger cylinder 11 to provide the plunger cylinder 11 with the required pressure, and the gas pressure generates the mechanical force required for polishing.

[0076] In addition, the selector valve 13 is an N-position (including de-energized) solenoid valve 132a, where N positions represent N conduction states of the solenoid valve, which can correspond to each gas path. When the N-position solenoid valve loses power, the gas pressure state used normally can be conducted. Figure 5 As shown in the figure, a four-position solenoid valve is shown. The figure shows a normally closed state when the power is off. When the power is off, all air paths are not connected. The solenoid valve also needs three positions to connect different air paths. At this time, compared with the aforementioned N-position solenoid valve, one more position, namely, an N+1-position solenoid valve, is required. The valve core needs to have N kinds of movements (plus the loss of power, which is N+1 position). The movement of the valve core can be achieved by multiple electromagnetic coils. When the number of positions is large, the control structure of the valve stem movement will be designed to be more complicated.

[0077] It has been described above that in one embodiment of the present invention, the mechanical force can be controlled by connecting the fluid element and controlling the simple circuit of turning on and off the solenoid valve coil.

[0078] like Figure 4bAs shown in , when the number of pressure regulating valves 21 is N, a pressure regulating valve 21 can be connected to each compressed gas A1 ... AN on each branch of the gas source. Compared with the previous embodiment, that is, the previous embodiment needs to set the input pressure A on the total gas line to the pressure CN required for one of the working conditions. In this embodiment, it is not necessary to deliberately set AN = CN, and the corresponding working condition pressure CN can be adjusted through the pressure regulating valve 21.

[0079] Figure 4c One fluid source is shown to be hydraulic oil under pressure.

[0080] Combination Figure 1 and Figure 3 The connection method of the relevant components of the fluid power control device of the thermos cup polishing machine is further described.

[0081] The sliding mechanism 3 includes a guide rail 31 and a slider 32. The guide rail 31 is connected to the main motion mechanism 4, thereby ensuring the follow-up motion relationship between the guide rail 31 and the main motion mechanism 4. The slider 32 is slidably connected to the guide rail 31, and the slider 32 is connected to a main seat plate 33, and the main seat plate 33 is connected to the workpiece 51 or the tool 52, thereby ensuring that the movement of the workpiece 51 or the tool 52 is a composite movement of the movement of the sliding mechanism 3 and the movement of the main motion mechanism 4. The plunger cylinder 11 has a cylinder body 111 and a plunger 112. The main motion mechanism 4 is connected to a cylinder body mounting seat 43. The cylinder body 111 is fixedly connected to the cylinder body mounting seat 43. The main seat plate 33 includes a limit block 331 (the limit block 331 is a fixedly connected part of the main seat plate 33. The two parts are relatively stationary and produce the same movement to other reference objects. The shape or component composition of the limit block 331 does not affect the realization of its related functions. For example, a gasket can be connected to the limit block 331 for spatial layout, and the gasket is also a component of the limit block 331). The plunger 112 is against or fixedly connected to the limit block 331 (as shown in the figure, the plunger 112 is connected to the gasket fixedly connected to the limit block 331 by bolts), and the axis of the plunger 112 is parallel to the movement direction of the guide rail 31. In this way, the plunger 112 transmits both force and motion to the limit block 331, that is, to the main seat plate 33 and the workpiece 51 or the tool 52 connected thereto when moving.

[0082] The guide rail 31 is a ball guide rail 31a. The ball guide rail 31a can provide smaller resistance, so that the polishing force can be better controlled.

[0083] The main motion mechanism 4 is also provided with a second limiter 41, and the second limiter 41 and the first limiter block 331 are used to limit the sliding range of the slider 32 (the slider 32 is fixed to the main seat plate 33, and the main seat plate 33 is fixed to the first limiter block 331), and the second limiter 41 includes a protrusion or a groove.

[0084] When the second limit block 41 includes a protrusion disposed on the main motion mechanism 4, the protrusion has a surface disposed opposite to the first limit block 331, and when the surface of the protrusion conflicts with the surface of the first limit block 331, the sliding range is limited.

[0085] refer to Figure 6 As shown, when the limiter 41 includes a groove provided on the main motion mechanism 4, part of the limit block 331 extends into the groove, the groove has a certain length in the movement direction of the guide rail, the inner wall of the groove is arranged opposite to the limit block 331, and when the wall of the groove conflicts with the surface of the limit block 331, the sliding range is limited.

[0086] The fluid power control device for the thermos cup polishing machine also includes a machine body 6, and the main motion mechanism 4 includes a circular plate 42. The circular plate 42 rotates around the Z axis relative to the machine body 6, slides along the X axis, and moves along the Y axis. The movement of the circular plate 42 relative to the machine body 6 is controlled by the position data of the CNC machining. The main motion mechanism 4 mainly provides the movement of the actuator of the original CNC machining machine.

[0087] The above is the technical solution of the present invention, which is mainly the description of the above-mentioned components and connection relationships. The concept of bionic design is adopted to imitate the control method of polishing force in manual polishing, and the important technical parameter of polishing force control in the polishing process is found, and a fluid dynamic structure is adopted to realize the control of different choices of polishing force. Accordingly, the beneficial effect brought by the present invention is that the machine is easy to operate, and the size of the mechanical force can be controlled by adjusting the pressure regulating valve in the adjustment mechanism; the structure is simple, and different mechanical forces can be selected in real time, and different forces can be adjusted according to different cup shapes (curved segments or straight segments) or different process steps; the force control effect is good, and the same batch of workpieces with large tolerances can be polished, avoiding over-polishing and under-polishing, and increasing the yield of the polishing process; and it is suitable for high-speed polishing, avoiding resonance and other situations that affect the processing accuracy.

[0088] The above specific embodiments and accompanying drawings are only used to illustrate the technical solutions and technical effects of the present invention, and are not used to limit the present invention. Any person skilled in the art who is familiar with the technology can modify or change the above embodiments within the scope of the claims without violating the technical principles and spirit of the present invention, and all of them belong to the scope of protection of the present invention.

Claims

1. A fluid power control device for a thermos cup polishing machine, characterized in that: Include: An actuating mechanism that can generate a mechanical force through fluid pressure; the actuating mechanism includes a plunger cylinder, a fluid source, and a selection valve; an adjusting mechanism, the adjusting mechanism being used to adjust the magnitude of the mechanical force generated by the actuating mechanism; a sliding mechanism connected to the actuating mechanism, and used for driving a workpiece or a tool to slide along an axial direction; A main motion mechanism, which provides the main motion of the workpiece or the tool according to the position data of the numerical control machining, and the main motion mechanism includes a circular plate; A body, the circular plate rotates relative to the body about the Z axis, slides along the X axis, and moves along the Y axis, the movement of the circular plate relative to the body is controlled by the position data of the CNC machining, and the sliding mechanism is installed on the circular plate; The adjustment mechanism includes a pressure regulating valve, the fluid source is divided into N fluid branches in parallel, N is greater than or equal to two, and the number of the pressure regulating valves is equal to N or N-1; when the number of the pressure regulating valves is equal to N, each of the pressure regulating valves is installed on each of the fluid branches, or when the number of the pressure regulating valves is equal to N-1, each of the pressure regulating valves is installed on N-1 of the fluid branches; The selector valve comprises N selector passages, each of which is connected to each of the fluid branches, and each of which is connected to the plunger cylinder; The selection valve comprises an N-position solenoid valve or an N+1-position solenoid valve or N switch solenoid valves, which drive the solenoid valve to connect one of the selected passages and close the other selected passages according to the numerical control processing program.

2. The fluid power control device for a vacuum cup polishing machine according to claim 1, characterized in that: The sliding mechanism includes a guide rail and a slider, the guide rail is connected to the main motion mechanism, the slider is slidably connected to the guide rail, the slider is connected to a main seat plate, the main seat plate is connected to the workpiece or the tool, the plunger cylinder has a cylinder body and a plunger, the main motion mechanism is connected to a cylinder body mounting seat, the cylinder body is fixedly connected to the cylinder body mounting seat, the main seat plate includes a limit block 1, the plunger is against or fixedly connected to the limit block 1, and the axis of the plunger is parallel to the movement direction of the guide rail.

3. The fluid power control device for a vacuum cup polishing machine according to claim 2, characterized in that: The guide rail is a ball guide rail.

4. The fluid power control device for a vacuum cup polishing machine as claimed in claim 2 or 3, characterized in that: The main motion mechanism is also provided with a second limiter, and the second limiter and the first limiter block are used to limit the sliding range of the slider, and the second limiter includes a protrusion or a groove.

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