CN104816166A - Pore opening and pore broadening integrated incremental forming hole flanging tool and hole flanging process - Google Patents

Abstract

The invention relates to a progressive forming hole turning tool and flanging process integrating hole opening and reaming, wherein the hole turning tool includes a connecting rod and a cutting hole turning tool head, and one end of the connecting rod is clamped on the spindle of a CNC machine tool, The other end is connected with the cutting hole-turning tool head, and the cutting hole-turning tool head includes a hole-turning profile and a cutting milling cutter, and the hole-turning profile is connected with a connecting rod; the hole-turning process is: use the milling cutter on the tool to perform Prefabricated hole processing: use the arc feature on the tool to extrude the sheet material on the XY plane according to the gradually expanding concentric circle movement track to complete the processing of the hole turning feature. Compared with the prior art, the present invention can complete the two-step process of cutting and forming without changing the tool, which reduces the number of props and tool changing process required in the traditional progressive forming hole turning, improves the processing efficiency, and can form The hole-turning parts with small thinning and uniform thickness distribution can greatly increase the thickness of the hole-turning formed parts and make the distribution more uniform.

Description

Incremental forming hole turning tool and hole turning process integrated with hole opening and reaming

technical field

The invention relates to a device and a process in the technical field of sheet metal forming, in particular to a progressive forming hole-reversing tool and a hole-reversing process integrated with opening and reaming.

Background technique

Hole turning is a traditional sheet metal forming process, which is mainly used to strengthen the edge of parts, remove trimming and make parts for assembly and connection with other parts or three-dimensional parts with complex special shapes and reasonable spaces. At the same time, it improves the rigidity of parts, and is widely used in industrial sectors such as automobiles, aviation, aerospace, instruments, and electronics. At present, hole turning is generally completed by traditional stamping process. This method requires corresponding molds, and there are time and cost defects in the production of small batch parts and single parts.

Sheet metal incremental forming is a sheet metal processing technology emerging in recent years, which has the characteristics of flexible processing methods, good forming performance and flexibility. At the same time, progressive forming can improve the forming performance of materials and requires less forming force, which can reduce the size and tonnage of forming equipment, and can well replace traditional stamping such as punching in the production of single-piece and small-batch products craft. Cui and Gao once used three different multi-step incremental forming strategies in "Studies on hole-flanging process using multistage incremental forming" (CIRP Journal of Manufacturing Science and Technology) to study the flanging of straight-wall round holes, and confirmed that the incremental Feasibility of hole turning in forming process. However, there are still some problems in the traditional incremental forming hole turning process. For example, the traditional incremental forming hole turning parts need to be drilled and formed independently, and the thickness of the formed part is greatly reduced and the distribution is uneven. The most important problem is that Dramatic thinning of formed part thickness and control of thickness distribution.

Contents of the invention

The purpose of the present invention is to overcome the defects in the above-mentioned prior art, solve the problem of the thickness of traditional incremental forming hole turning parts, and provide a progressive forming hole turning tool and hole turning process integrated with opening and reaming, which can obtain thickness reduction Parts with small quantities and more even distribution.

The purpose of the present invention can be achieved through the following technical solutions:

A progressive forming hole turning tool integrating hole opening and reaming, connected with the spindle of a CNC machine tool, including a connecting rod and a cutting hole turning tool head, one end of the connecting rod is clamped on the spindle of the CNC machine tool, and the other end is connected to the cutting hole turning tool The tool head is connected, and the cutting and turning tool head includes a connected turning hole profile and a cutting milling cutter, and the turning hole profile is connected with a connecting rod; the CNC machine tool spindle drives the cutting and turning tool head to the sheet through the connecting rod Carry out hole drilling and flanging and reaming.

The hole-turning profile includes a circular arc surface and a cylindrical surface arranged in sequence.

The arc surface matches the flanging shape of the sheet material.

The height of the cylindrical surface is greater than the difference between the radius of the final hole and the radius of the prefabricated hole.

The cutting milling cutter is a ball end milling cutter.

A progressive forming hole turning process integrating hole opening and hole expansion, comprising the following steps:

1) According to the shape and size of the prefabricated hole to be cut, generate the first tool movement trajectory of the cutting milling cutter;

2) According to the shape and size of the hole-turning part, generate the second tool motion trajectory of the hole-turning profile movement;

3) Fix the sheet and press the edge;

4) Start the CNC machine tool, and control the cutting milling cutter to cut the prefabricated hole on the sheet according to the movement track of the first tool;

5) The spindle of the CNC machine tool drives the progressive forming hole turning tool to move down and locate, so that the hole turning surface is close to the sheet material, and the hole turning surface is controlled according to the movement track of the second tool to complete the hole turning process;

6) After the forming is completed, the spindle of the CNC machine tool drives the progressive forming hole turning tool to move upwards to remove the sheet material.

The movement trajectory of the second tool is a movement trajectory of concentric circles gradually expanding in the X-Y plane.

Compared with the prior art, the present invention has the following advantages:

(1) The present invention designs the cutting hole-turning tool head that simultaneously includes the hole-turning profile and the cutting milling cutter. The hole-turning part with uniform thickness distribution avoids excessive thinning of the sheet metal in the traditional incremental forming hole-turning process, thereby improving the rigidity of the part structure.

(2) The cutting and turning tool head of the flanging tool of the present invention includes two parts, the turning surface and the cutting milling cutter. The number of required props and the tool change process improve the processing efficiency.

(3) The present invention adopts the concentric circular motion trajectory in the X-Y plane to carry out the hole-turning process, and only two-axis linkage machine tools are needed to realize the described hole-enlargement process, without the required numerical control three-axis linkage machine tool for progressive forming and hole expansion, and without The presses and molds required for traditional punching and reaming require relatively low equipment costs.

Description of drawings

Fig. 1 is the structural representation of flanging tool of the present invention;

Fig. 2 is a schematic flow chart of the flanging process of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

As shown in Figure 1, this embodiment provides a progressive forming hole turning tool integrated with hole opening and reaming, which is connected to the spindle of the CNC machine tool, including a connecting rod 1 and a cutting hole turning tool head, and one end of the connecting rod 1 is clamped on the CNC machine tool. On the main shaft of the machine tool, the other end is connected with the cutting and turning tool head. The cutting and turning tool head includes the connected turning surface 2 and the cutting milling cutter 3, and the turning surface 2 is connected with the connecting rod 1. The spindle of the CNC machine tool drives the cutting and turning tool head through the connecting rod 1 to complete the hole opening and flanging and reaming of the sheet at one time, without tool replacement.

The hole turning profile 2 includes arc curved surface and cylindrical surface arranged in sequence, the arc curved surface matches the flanging shape of the sheet material, and the cylindrical surface has a certain height, which is greater than the difference between the radius of the final hole and the radius of the prefabricated hole. The cutting milling cutter 3 is a ball nose vertical milling cutter.

As shown in Figure 2, the hole turning process realized by using the above-mentioned progressive forming hole turning tool integrating hole opening and reaming includes the following steps:

1) According to the shape and size of the prefabricated hole that needs to be cut, generate the first tool movement trajectory 5 of the cutting milling cutter 3 movement;

2) According to the shape and size of the hole-turning part, the second tool trajectory 8 for the movement of the hole-turning profile 2 is generated. The second tool trajectory is different from traditional progressive forming, and is a concentric circle trajectory that gradually expands in the X-Y plane;

3) Fixing the sheet material 6 on the workbench 7 of the CNC incremental forming machine tool and pressing the edges;

4) First clamp the connecting rod 1 of the incremental forming hole turning tool 4 to the end of the spindle of the progressive CNC machine tool, set a suitable tool feed rate, start the CNC machine tool, and control the cutting milling cutter 3 on the plate according to the first tool movement track The cutting prefabricated hole on the material 6 is shown in (a) of Figure 2;

5) The spindle of the CNC machine tool drives the progressive forming hole turning tool to move down and position, so that the hole turning surface 2 is close to the sheet material 6, and the hole turning surface 2 is controlled according to the movement track of the second tool to complete the hole turning process, as shown in Figure 2 (b ), (c);

6) After the forming is completed, the spindle of the CNC machine tool drives the incremental forming hole-turning tool to move upwards, and the sheet material 6 is removed.

Claims (7)

1. the progressive molding hole flanging instrument of a perforate reaming integration, be connected with main shaft of numerical control machine tool, it is characterized in that, comprise connecting rod (1) and cut hole flanging tool heads, described connecting rod (1) one end is held on main shaft of numerical control machine tool, the other end is connected with cutting hole flanging tool heads, described cutting hole flanging tool heads comprises the hole flanging profile (2) and cutting mill (3) that are connected, and described hole flanging profile (2) is connected with connecting rod (1); Main shaft of numerical control machine tool drives cutting hole flanging tool heads to carry out perforate and flange reaming to plate by connecting rod (1).

2. the progressive molding hole flanging instrument of perforate reaming integration according to claim 1, is characterized in that, described hole flanging profile (2) comprises the circular arc camber and the face of cylinder that set gradually.

3. the progressive molding hole flanging instrument of perforate reaming integration according to claim 1, is characterized in that, the flange mating shapes of described circular arc camber and plate.

4. the progressive molding hole flanging instrument of perforate reaming integration according to claim 1, is characterized in that, the height on the described face of cylinder is greater than the difference of final apertures radius and pre-manufactured hole radius.

5. the progressive molding hole flanging instrument of perforate reaming integration according to claim 1, is characterized in that, described cutting mill (3) is bulb vertical milling cutter.

6. adopt a flange hole technology for the progressive molding hole flanging instrument of the arbitrary described perforate reaming integration of claim 1-5, it is characterized in that, comprise the following steps:

1) shape of the pre-manufactured hole cut as required and size, generate the first movement of tool track that cutting mill (3) moves;

2) according to shape and the size of hole flanging part, the second movement of tool track that hole flanging profile (2) moves is generated;

3) fixing plate flanging;

4) start Digit Control Machine Tool, on plate, cut pre-manufactured hole by the first movement of tool TRAJECTORY CONTROL cutting mill (3);

5) main shaft of numerical control machine tool drives described progressive molding hole flanging instrument to move down location, makes hole flanging profile (2) near plate, completes hole flanging processing by the second movement of tool TRAJECTORY CONTROL hole flanging profile (2);

6) be shaped, main shaft of numerical control machine tool drives described progressive molding hole flanging to move tool up, and takes off plate.

7. the progressive molding flange hole technology of perforate reaming integration according to claim 6, is characterized in that, described second movement of tool track is the concentric circles movement locus expanded gradually in X-Y plane.