A modular productive clamping mechanism and machining process for a numerically controlled machine tool

Abstract

The present invention relates to the technical field of machining in aviation manufacturing, and in particular to a modular productive clamping mechanism and machining process for a numerical control machine tool, including a primary clamping backing plate and bolts; a plurality of stepped holes are arranged in an array on the primary clamping backing plate, the stepped holes include a connected upper hole and a lower hole, the lower hole is a threaded hole, and the bolts are threadedly connected to the primary clamping backing plate through the threaded holes; a secondary clamping backing plate is further included, the size of the secondary clamping backing plate is 400×500×45 mm, the size of the primary clamping backing plate is 1200×500×60 mm, and a plurality of secondary stepped holes are arranged in an array on the secondary clamping backing plate, and the secondary stepped holes have the same specifications as the stepped holes. The present invention effectively improves the utilization rate of personnel and the production efficiency of workpieces.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation manufacturing machining, and particularly relates to a modular productive clamping mechanism and a machining process for a numerically controlled machine tool. Background Art

[0002] The existing production mode of numerically controlled machine tools is single-person, single-machine, single-piece production, that is, a single person uses a single device to produce a single part. When clamping the part, the machine needs to be stopped. The spindle operating rate of the machine tool is about 20% - 30%, and the personnel utilization rate of numerical control operators is relatively low, failing to achieve the optimal allocation effect of production resources. Summary of the Invention

[0003] The object of the present invention is to address the problems in the background art and propose a modular productive clamping mechanism for a numerically controlled machine tool, including a primary clamping backing plate and bolts; a plurality of stepped holes are arranged in an array on the primary clamping backing plate. The stepped holes include a connected upper hole and a lower hole. The lower hole is a threaded hole, and the bolt is threadedly connected to the primary clamping backing plate through the threaded hole.

[0004] Preferably, the upper hole is a φ12H8 hole with a depth of 25 mm; the lower hole is an M10 thread with a threaded hole depth of 30 mm; the bolt specification is φ12H8 at the upper part and M10 at the lower part.

[0005] Preferably, the hole pitch between adjacent two stepped holes is 25 mm.

[0006] Preferably, it further includes a secondary clamping backing plate. The size of the secondary clamping backing plate is 400×500×45 mm, and the size of the primary clamping backing plate is 1200×500×60 mm. A plurality of secondary stepped holes are arranged in an array on the secondary clamping backing plate, and the secondary stepped holes have the same specifications as the stepped holes.

[0007] A machining process for a numerically controlled machine tool includes the above-mentioned modular productive clamping mechanism for a numerically controlled machine tool. The process holes and clamping holes on the workpiece to be machined all adopt a hole pitch that is a multiple of 25 mm, and the process hole diameters are all φ12H8 to cooperate with the primary clamping backing plate and the secondary clamping backing plate.

[0008] Preferably, when clamping the workpiece, the workpieces are clamped on the primary clamping backing plate and the secondary clamping backing plate in a matrix row and column according to categories and at a distance of 25 mm to form a productive group.

[0009] Preferably, the numerically controlled machine tool adopts a Fanuc or Siemens operating system.

[0010] Preferably, a numerical control tool distribution system is adopted. After the production plan is issued, the tool distribution personnel receive tools according to the tool list on the process document, and the numerically controlled tool loading workers uniformly distribute the loaded tools to the standardized machine tools.

[0011] Preferably, a working mechanism of one person operating N machines with two shifts is adopted. The processing times of different groups of parts on N machine tools are different. After each machine tool finishes processing, the disassembly and clamping of the next group of parts are carried out at staggered times.

[0012] Compared with the prior art, the present invention has the following beneficial technical effects:

[0013] The present invention improves the personnel utilization efficiency; the personnel efficiency changes from the original one person operating one machine to one person operating N machines, which is N times the original. The downtime during workpiece clamping is reduced, and the tool clamping time is omitted. The on-line standardized clamping time is about 1 / 3 of the original, and the off-line clamping is about 1 / 8 of the original (taking the example of clamping 10 workpieces with a secondary clamping backing plate). The more workpieces are clamped, the more time is saved. After productive group machining, the on-line machining time of each tool is extended, the tool change times are reduced, and thus the downtime of the CNC machine tool is reduced (taking the example of clamping 10 workpieces with a clamping backing plate, the tool change times are 1 / 10 of the original single-piece production). The spindle operating rate of the machine tool is increased from 20% - 30% to 60% - 70%, and the efficiency is increased by 2 - 3 times. The entire productive group machining process is simple and clear, easy to implement and maintain, and the economic benefits are obvious. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the primary clamping backing plate in the embodiment of the present invention;

[0015] Figure 2 It is a schematic structural diagram of clamping a workpiece using a secondary clamping backing plate and a bolt;

[0016] Figure 3 It is a schematic structural diagram of clamping a workpiece using a primary clamping backing plate, a secondary clamping backing plate and a bolt;

[0017] Figure 4 It is a schematic structural diagram of the bolt.

[0018] Reference numerals: 1, primary clamping backing plate; 101, stepped hole; 2, secondary clamping backing plate; 3, bolt. Detailed Embodiments

[0019] As Figures 1-4 shown, a modular productive clamping mechanism and processing technology for a CNC machine tool proposed by the present invention mainly start from reducing the clamping of CNC parts, reducing the tool change of the CNC machine tool, and optimizing the configuration of CNC operators, and are described as follows:

[0020] ① Standardization of the primary clamping backing plate 1:

[0021] Within the effective stroke range of the machine tool, the first-level clamping pad 1 is made of an aluminum plate with a specification of 1200×500×60 mm. The first-level clamping pad 1 can be used to clamp workpieces and also serve as the base for the second-level clamping pad 2. A certain number of stepped holes 101 are arranged in an array on the first-level clamping pad 1. The upper half of the stepped hole 101 is a φ12H8 hole with a hole depth of 25 mm, and the lower half is made with an M10 thread with a thread depth of 30 mm. The standard hole pitch between the stepped holes 101 is 25 mm. The stepped hole 101 is both a clamping hole and a positioning hole.

[0022] ②. Standardization of clamping tools:

[0023] According to the clamping depth of the workpiece, a series of bolts 3 with φ12H8 at the upper part and M10 at the lower part are uniformly used to clamp parts, including bolts 3 of various lengths, reducing the types of clamping tools and simplifying the clamping method.

[0024] ③. Standardization of process holes and clamping holes for CNC workpieces

[0025] The process holes and clamping holes of CNC workpieces all adopt a standardized hole pitch that is a multiple of 25 mm, and the process hole diameters are all φ12H8 to facilitate cooperation with the machine tool pad.

[0026] ④. Standardization of part clamping

[0027] The parts are clamped on the pad in a matrix row and column at a standard distance of 25 mm according to categories (such as angle box type, longeron type, etc.) to form productive grouping.

[0028] ⑤. Standardization of CNC machine tool operating systems

[0029] All machine tools in the CNC unit adopt Fanuc or Siemens operating systems. This reduces the post-processing time of CNC programs and the program upload time, improves the programming efficiency of process personnel, and increases the universality of CNC programs among various machine tools.

[0030] ⑥. Standardization of CNC tool loading

[0031] The CNC tool distribution system is adopted. After the production plan is issued, the tool distribution personnel receive tools according to the tool list on the process document, and the CNC tool loader uniformly distributes the loaded tools to the standardized machine tools, reducing the tool loading and downtime of CNC operators. At the same time, the unified use and recycling of tools, sleeves, and chucks also significantly shorten the turnover cycle and improve the circulation and use efficiency of tooling and measuring tools.

[0032] ⑦. Standardization of CNC personnel allocation

[0033] The numerical control unit adopts a working mechanism of one operator for N machines with two shifts, which greatly improves the personnel utilization efficiency of the operators. In addition, the processing durations of different groups of parts on the N machine tools are different. After each machine tool finishes processing, the time can be staggered for the disassembly and clamping of the next set of parts. Although the labor intensity of the workers has increased, their income has also increased significantly year-on-year, thus improving the labor enthusiasm of the operators and forming a virtuous cycle.

[0034] ⑧. Standardization of the clamping of the offline secondary clamping pad 2

[0035] The production unit can clamp the workpiece to be processed on the secondary pad offline in advance. After the machine tool finishes processing the parts online, the secondary pad with the parts clamped can be directly installed on the primary pad for production. The offline quick-change tooling clamping can reduce the clamping downtime and improve the workpiece production efficiency. By using the self-made secondary clamping pad of 400×500×45mm, a certain number of stepped holes are also opened on its surface, and the specifications are the same as those of the primary pad.

[0036] This embodiment improves the personnel utilization efficiency; the personnel efficiency changes from one operator for one machine originally to one operator for N machines, which is N times the original. It reduces the downtime during workpiece clamping and omits the tool clamping time. The online standard clamping time is about 1 / 3 of the original, and the offline clamping is about 1 / 8 of the original (taking the clamping of 10 workpieces by the secondary clamping pad 2 as an example). The more workpieces are clamped, the more time is saved. After the productive group machining, the online machining time of each tool is extended, and the tool change times are reduced, thus reducing the downtime of the CNC machine tool (taking the clamping of 10 workpieces by the clamping pad as an example, the tool change times are 1 / 10 of the original single-piece production). The spindle operation rate of the machine tool is increased from 20% - 30% to 60% - 70%, and the efficiency is increased by 2 - 3 times. It makes the entire productive group machining process simple and clear, easy to implement and maintain, and has obvious economic benefits.

[0037] The above has described in detail the embodiments of the present invention in conjunction with the accompanying drawings. However, the present invention is not limited to this. Various changes can be made without departing from the spirit of the present invention within the knowledge scope of those skilled in the art to which the present invention pertains.

Claims

1. A modular productive clamping mechanism for a numerically controlled machine tool, characterized in that, it includes a first-level clamping backing plate (1) and bolts (3); a plurality of stepped holes (101) are arranged in an array on the first-level clamping backing plate (1). The stepped holes (101) include a connected upper hole and a lower hole. The lower hole is a threaded hole, and the bolts (3) are threadedly connected to the first-level clamping backing plate (1) through the threaded holes. The stepped holes (101) are both clamping holes and positioning holes; the upper hole is a φ12H8 hole with a depth of 25 mm; the lower hole is an M10 thread with a depth of 30 mm; the bolts (3) have a specification of φ12H8 in the upper part and M10 in the lower part; the hole pitch between adjacent stepped holes (101) is 25 mm; it further includes second-level clamping backing plates (2). Two second-level clamping backing plates (2) are arranged side by side. The size of the second-level clamping backing plate (2) is 400×500×45 mm, and the size of the first-level clamping backing plate (1) is 1200×500×60 mm. A plurality of secondary stepped holes are arranged in an array on the second-level clamping backing plate (2), and the secondary stepped holes have the same specifications as the stepped holes (101); offline, the workpiece to be processed is clamped on the second-level clamping backing plate (2) in advance. After the machine tool completes the processing of the workpiece online, the second-level clamping backing plate (2) with the workpiece installed is directly installed on the first-level clamping backing plate (1) for production; the process holes and clamping holes on the processed workpiece all adopt a hole pitch that is a multiple of 25 mm, and the process hole diameters are all φ12H8 to cooperate with the first-level clamping backing plate (1) and the second-level clamping backing plate (2); a working mechanism of one person operating N machines with two shifts is adopted. The processing durations of different groups of workpieces on N machine tools are different. After each machine tool finishes processing, the grouped disassembly and clamping of the next workpiece are carried out at staggered times.

2. The modular productive clamping mechanism for a numerically controlled machine tool according to claim 1, characterized in that, when clamping the workpiece, the workpieces are clamped on the first-level clamping backing plate (1) and the second-level clamping backing plate (2) in a matrix row and column according to categories and at a distance of 25 mm to form a productive group.

3. The modular productive clamping mechanism for a numerically controlled machine tool according to claim 1, characterized in that, the numerically controlled machine tool adopts a Fanuc or Siemens operating system.

4. The modular productive clamping mechanism for a numerically controlled machine tool according to claim 1, characterized in that, a numerical control tool distribution system is adopted. After the production plan is issued, the tool distribution personnel receive tools according to the tool list on the process document, and the numerically controlled tool loading workers uniformly distribute the loaded tools to the numerically controlled machine tool.

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