Automatic polishing method for deep narrow grooves of valve rod parts

Abstract

The invention relates to an automatic polishing method for a deep narrow groove of a valve rod part. A ball head dragging type passivation polishing machine is adopted. A plurality of rotating shafts 2 are evenly distributed at the output end of a power main shaft of the ball head dragging type passivation polishing machine, and a modularized connecting disc is fixed to the end of each rotating shaft. A workpiece is clamped on the modular connecting disc, it is ensured that the workpiece is stable and does not rotate, and prepared grinding materials are added into the grinding material box; the power main shaft and the rotating shaft rotate to drive a workpiece to rotate in the grinding material, and polishing is achieved. Turning and grinding are replaced by the ball head dragging type passivation polishing machine, and a modular tool is designed on the original basis of equipment to solve the problem of low polishing efficiency, so that 48 pieces can be clamped at a time, the equipment runs fully automatically, the surfaces of the parts are polished, the design requirements are met, the automatic machining efficiency of the parts is improved, and batch production is achieved.

Description

Technical Field

[0001] This invention belongs to the field of precision machining and micromachining, and specifically relates to an automated polishing method for deep and narrow grooves in valve stem parts, which is used for automated batch polishing of valve stem parts. Background Technology

[0002] In hydraulic control systems, the surface roughness of the valve stem directly determines the reliability of system operation. When machining certain valve stem parts with narrow grooves, ion nitriding is performed on the surface to ensure wear resistance. However, due to the limited thickness of the ion nitriding film, the finishing allowance is insufficient, making machining by turning impossible. Simultaneously, the limited width of the groove prevents conventional grinding wheels from entering, thus making grinding an unreliable method for ensuring product quality. Traditional processes employ manual polishing, clamping the parts on a conventional lathe and manually grinding with metallographic sandpaper to improve surface roughness. This results in poor product quality stability, low efficiency, and safety risks associated with manual contact with rotating equipment. Summary of the Invention

[0003] This invention provides an automated polishing method for deep and narrow grooves in valve stem parts. It replaces turning and grinding with a ball-head drag-type passivation polishing machine. Modular tooling is designed based on the original equipment to solve the problem of low polishing efficiency and improve the surface roughness of deep and narrow grooves in valve stem parts.

[0004] To solve the above technical problems, the present invention provides an automated polishing method for deep and narrow grooves of valve stem parts, characterized in that: a ball-head drag-type passivation polishing machine is used; multiple rotating shafts 2 are evenly distributed at the output end of the power spindle of the ball-head drag-type passivation polishing machine, and a modular connecting plate is fixed at the end of each rotating shaft; The workpiece is clamped on the modular connecting plate, ensuring it is stable and will not rotate. The prepared abrasive is added to the abrasive box. The workpiece is rotated in the abrasive by the rotation of the power spindle and the rotating shaft, thus achieving polishing.

[0005] Beneficial effects: This invention replaces turning and grinding with a ball-head drag-type passivation polishing machine. Based on the original equipment, modular tooling is designed to solve the problem of low polishing efficiency, thereby enabling the simultaneous clamping of 48 parts. The equipment operates in a fully automated manner, polishing the surface of the parts to meet design requirements, improving the automated processing efficiency of parts, and realizing mass production.

[0006] This invention has been successfully applied to the field of automated polishing technology for deep and narrow grooves in valve stem parts. By replacing manual polishing with a ball-head drag-type passivation polishing machine, significant economic and social benefits have been achieved. Economically, the automated equipment can process 48 parts at a time, increasing efficiency by three times. Socially, it completely eliminates safety risks in polishing operations, reduces occupational hazards, and its modular tooling design adapts to various parts, promoting automation upgrades in the industry. Furthermore, physical polishing produces no chemical pollution, making it both environmentally friendly and valuable for industrial promotion. Attached Figure Description

[0007] Figure 1 This invention relates to an automated polishing device for deep and narrow grooves in valve stem parts; The components include: 1. Power spindle, 2. Rotary shaft, 3. Modular connecting plate, 4. Workpiece, 5. Abrasive, and 6. Abrasive box. Detailed Implementation

[0008] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below.

[0009] This invention proposes an automated polishing method for deep and narrow grooves in valve stem parts, employing a ball-head drag-type passivation polishing machine and modular polishing fixtures; Specifically, it includes a power spindle 1, a rotary shaft 2, a modular connecting plate 3, an abrasive 5, and an abrasive box 6; Multiple rotating shafts 2 are evenly distributed on the power spindle 1. Each rotating shaft has a modular connecting plate fixed at its end. Multiple workpieces can be connected to the bottom of the modular connecting plate. Abrasive 5 is added to abrasive box 6 for polishing multiple workpieces.

[0010] The specific operating procedure is as follows: 1) The workpiece is machined to its theoretical dimensions; 2) Prepare suitable modular connecting discs and abrasives; 3) Connect the modular connecting plate to the rotating shaft and fix it in place. Add the prepared abrasive to the abrasive box to the designated position. 4) Clamp the workpiece on the modular connecting plate, ensuring it is secure and will not rotate; 5) Set the direction and speed of the power spindle and rotary axis, and the relative depth of the workpiece entering the abrasive box; 6) Start the equipment. The equipment will run automatically. The operator can observe the polishing process and the polishing effect of the workpiece through the observation window. 7) The automation program finishes running and the workpiece is raised from the abrasive box; 8) Disassemble the workpiece and check the polishing quality.

[0011] The key points of this invention for the automated polishing method of deep and narrow grooves in valve stem parts are: ① Modular polishing unit design Traditional polishing relies on manual operation, with an average daily processing capacity of less than 100 pieces per person. The ball-head drag passivation polishing machine is designed with 8 rotating shafts, theoretically allowing for the simultaneous polishing of 8 parts in a single run. To further improve work efficiency, a connecting disc extends from the polishing machine's rotating shaft interface, allowing for the simultaneous clamping of 6 parts. This forms a modular structure for the special tooling, enhancing the equipment's expandability while improving work efficiency. With a capacity of 48 parts per clamp, the machine only needs 30 minutes for a single run, and its daily processing capacity can reach 700 pieces.

[0012] ② Ergonomic Design The traditional manual polishing process using a conventional lathe not only suffers from low efficiency and inconsistent product quality, but more seriously, it poses significant safety risks due to direct human contact with rotating equipment. In contrast, the drag-type passivation polishing machine addresses this issue. For deep, narrow groove valve stem parts that cannot be machined by turning or grinding, the parts are clamped onto the ball-head drag-type passivation polishing machine via a modular connecting plate. The operator only needs to clamp the parts, close the safety door, and start the machine. The abrasive box automatically rises to the designated height and rotates simultaneously. At the same time, the rotating shaft carries the parts in the opposite direction and slowly descends until the parts are fully immersed in the abrasive box. After a designated working time, the rotation direction and speed can be automatically adjusted according to a preset program. The operator can observe the polishing process through the viewing window. The entire polishing process is automated, requiring no manual intervention and completely eliminating the safety hazards of human contact with rotating equipment.

[0013] The modular connection disc design allows for polishing of a wider range of parts, offering excellent versatility.

[0014] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An automated polishing method for deep and narrow grooves in valve stem parts, characterized in that: A ball-head drag-type passivation and polishing machine is adopted; multiple rotating shafts 2 are evenly distributed at the output end of the power spindle of the ball-head drag-type passivation and polishing machine, and a modular connecting plate is fixed at the end of each rotating shaft; The workpiece is clamped on the modular connecting plate, ensuring it is stable and will not rotate. The prepared abrasive is added to the abrasive box. The workpiece is rotated in the abrasive by the rotation of the power spindle and the rotating shaft, thus achieving polishing.

2. The automated polishing method for deep and narrow grooves in valve stem parts according to claim 1, characterized in that: For valve stem parts, deep and narrow grooves should be submerged in abrasive.

3. The automated polishing method for deep and narrow grooves in valve stem parts according to claim 1, characterized in that: The direction and speed of the power spindle and the rotary axis, as well as the relative depth of the workpiece entering the abrasive box, need to be set.

4. The automated polishing method for deep and narrow grooves in valve stem parts according to claim 1, characterized in that: The ball-head drag passivation polishing machine is designed with 8 rotating shafts.

5. The automated polishing method for deep and narrow grooves in valve stem parts according to claim 1, characterized in that: The abrasive box will automatically rise to the designated height and rotate at the same time.

6. The automated polishing method for deep and narrow grooves in valve stem parts according to claim 5, characterized in that: The rotating shaft carries the parts in the opposite direction to the abrasive box and slowly descends until the parts are completely immersed in the abrasive box.

7. The automated polishing method for deep and narrow grooves in valve stem parts according to claim 6, characterized in that: After the designated working time, change the direction and speed of the rotating shaft to check the polishing status.

8. An automated polishing apparatus for deep and narrow grooves in valve stem parts for use in the method of claim 1, characterized in that: Including a ball-head drag-type passivation polishing machine; the ball-head drag-type passivation polishing machine has multiple rotating shafts 2 evenly distributed at the output end of the power spindle, and each rotating shaft has a modular connecting plate fixed at its end.

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