CN105855820A - Rapid manufacturing method of frame mold - Google Patents

Abstract

The invention proposes a method for rapidly manufacturing a frame mold, which uses a wooden high-density fiberboard as a blank to make a wooden mold, and uses thin steel plates to weld the frame structure of the frame mold. In the next step, on the incremental forming machine tool, the incremental forming technology is used to process the forming frame mold surface on the template. Next the formwork and frame structure are welded together. After heat treatment, the frame mold is stress-relieved and annealed to achieve the required performance index. Finally, use incremental forming equipment or CNC machining equipment to fine-mill the frame mold surface to make the mold meet the required precision requirements. The welding equipment, progressive forming equipment, heat treatment equipment and numerical control processing equipment used in this method adopt existing equipment in the market, not limited to specific models, as long as they can meet the requirements of parts manufacturing. In the present invention, the incremental forming technology is used to form the profile of the frame mold. Compared with the stamping process, for the frame mold with small batch size and many types, the cost is reduced and the manufacturing cycle of the mold is shortened.

Description

A method for rapid manufacturing of frame molds

【Technical field】

The invention relates to a method for manufacturing a mold, in particular to a method for manufacturing a frame mold suitable for composite materials, which is used for forming composite materials and belongs to the technical field of mold manufacturing and processing.

【technical background】

Now in the field of aviation manufacturing, in order to reduce the weight of aircraft and improve economy, composite materials are widely used. Because the forming of composite materials is usually completed in a mold, with the increasing demand for composite materials and the variety of products, there is an urgent need for a method that can quickly manufacture molds.

At present, in the actual production process, the frame mold is usually used as the mold in the auxiliary material forming process. Frame molds generally consist of support structures and templates. The support structure is generally made of metal profiles to support the formwork above; the formwork is mainly made of sheet metal and stamping processes to form the required profile. The heat capacity of the frame mold is small, which is convenient for heat conduction, and the weight is light, and the transfer is convenient. This structure is suitable for various composite material molding processes such as autoclave molding, vacuum bag molding, and vacuum introduction molding.

However, in the traditional stamping manufacturing process of the template, it is necessary to make a mold for forming the surface. For composite material molds with small batches, various types, and complex profiles, the cost is high and the cycle is long. Compared with the traditional stamping process, the technical characteristics of the incremental forming technology are more suitable for the manufacture of frame molds. Incremental forming technology is based on the idea of layered manufacturing, making three-dimensional parts two-dimensional, using the forming tool head, and extruding the required part shape layer by layer along the contour contour line. It has the advantages of no mold or simple mold, which is very important for production. Small batch products have the advantages of low cost and high production efficiency. Therefore, how to start from the aspects of improving efficiency and reducing costs, developing advanced technology, and using incremental forming technology to achieve low-cost and rapid manufacturing is an urgent need for manufacturing frame molds.

【Content of invention】

1. Purpose: The purpose of the present invention is to solve the problems of high cost and high time consumption in traditional mold manufacturing, and provide a manufacturing method for rapidly manufacturing frame molds based on incremental forming technology.

2. Technical solution:

Wooden high-density fiberboard is used as a blank to make a wooden mold, and thin steel plates are used to weld the frame structure of the frame mold. In the next step, on the incremental forming machine tool, the incremental forming technology is used to process the forming frame mold surface on the template. Next the formwork and frame structure are welded together. After heat treatment, the frame mold is stress-relieved and annealed to achieve the required performance index. Finally, use incremental forming equipment or CNC machining equipment to fine-mill the frame mold surface to make the mold meet the required precision requirements. The welding equipment, progressive forming equipment, heat treatment equipment and numerical control processing equipment used in this method adopt existing equipment in the market, not limited to specific models, as long as they can meet the requirements of parts manufacturing.

The present invention proposes a kind of framework mold fast manufacturing method, and this method comprises the following steps:

Step 1. Preparation of materials and equipment: Prepare templates and frame structures of corresponding sizes and materials according to the shape and performance requirements of the frame mold; use wooden high-density fiberboard as a blank to make wooden molds used in the progressive forming process;

Step 2. Shaped surface formed by incremental forming technology: Compared with the required surface made by traditional sheet metal and stamping processes, this method uses more efficient and economical incremental forming technology to form the profile of the template; fix the wooden mold and template to On the incremental forming equipment, the incremental forming technology is used to form the template to form the surface size of the designed frame mold;

Step 3. Mold structure strengthening: After the surface processing of the template of the frame mold is completed, it is removed from the progressive forming machine tool, and the template and the frame structure are welded together to form a frame mold;

Step 4, heat treatment: use heat treatment equipment, frame mold is put into heat treatment equipment, by heat treatment technology, make frame mold reach the service requirement of mould;

Step 5. Micro-treatment of the mold surface: After the heat treatment is completed, the frame mold is installed on the incremental forming equipment or the CNC processing equipment, and the precise CNC machining of the shape is carried out according to the final size requirements of the parts, and the final size parts are obtained, and the processing is completed.

Wherein, the frame structure in step 1 is a support structure formed by welding steel plates using welding equipment on the basis of ensuring the rigidity of the mold and effectively supporting the template according to the stress of the frame mold;

Among them, the heat treatment technology in step 4 mainly refers to stress relief annealing, which eliminates processing stress and thermal stress generated by welding, and other heat treatment methods can also be used to strengthen the material of the frame mold.

3. Advantages and effects: In the present invention, progressive forming technology is used to form the profile of the frame mold. Compared with the stamping process, for frame molds with small batch sizes and many types, the cost is reduced and the manufacturing cycle of the mold is shortened.

【Description of drawings】

Fig. 1 is a process flow chart of a rapid manufacturing method for a frame mold of the present invention.

Figure 2a is the device and material of the present invention.

Fig. 2b is the forming surface of the incremental forming technology of the present invention.

Fig. 2c shows that the mold structure of the present invention is strengthened and heat-treated.

Fig. 2d is the surface micro-treatment of the mold of the present invention.

Fig. 3 is the dimension of the molded surface of the present invention.

Fig. 4 is the final mold diagram obtained in the embodiment of the present invention.

The symbols in the figure are explained as follows:

1 template; 2 frame structure; 3 wooden mold; 4 incremental forming equipment;

5 machine fixtures; 6 progressive forming tools; 7 CNC processing equipment; 8 ball end milling cutters;

【detailed description】

It is proposed to use low-expansion alloy 4J36 as the material of the frame mold, the template is made of 8mm-thick low-expansion alloy 4J36 steel plate, and the frame structure is welded by 6mm-thick low-expansion alloy 4J36 steel plate. The dimensions of the formed profile are shown in Figure 3, where the length of the area where the profile needs to be formed is a=340mm, the width b=140mm, and the height c=20mm. The manufacturing goal is to manufacture frame molds. Below in conjunction with Fig. 1-4 illustrate the specific implementation steps of the present invention:

Step 1. Prepare the frame structure 2 welded by the low-expansion alloy 4J36 steel plate with a thickness of 500 mm × 300 mm × 8 mm as template 1 and 6 mm thick low-expansion alloy 4J36 steel plate according to the required profile size (Fig. 3); prepare 10 A 20mm thick wooden high-density fiberboard, using wood glue to bond the wooden high-density fiberboard into a 200mm thick blank, making the wooden mold 3 used in the incremental forming process according to the surface of the forming template;

Step 2, as shown in Figures 2a, 2b, 2c and 2d, the wooden mold 3 is fixed on the incremental forming equipment 4, the template is placed on the wooden mold 3, and fixed by the machine tool clamp 5; Under the action, the template is formed into the profile size shown in Figure 3 by using the progressive forming technology, wherein the area where the profile needs to be formed has a length of a=340mm, a width of b=140mm, and a height of c=20mm;

Step 3, remove the processed template from the progressive forming equipment, as shown in Figures 2a, 2b, 2c and 2d, place the template 1 on the frame structure 2; use the welding equipment, adopt the gas shielded arc welding method, Use ER55-Ni1 welding wire to weld the template and frame structure together;

Step 4. Using heat treatment equipment, put the frame mold into the heat treatment equipment, perform stress relief annealing, keep at a temperature of 190°C (±10°C) for 6-7 hours, and then slowly cool in the heating equipment;

Step 5. After the heat treatment is completed, take the frame mold out of the heating equipment, and install the frame mold on the CNC processing equipment 7, use a ball end mill 8, the model is a straight shank ball end mill 5GB/T20773-2006 , the feed speed is 3000mm/min, the spindle speed is 2400r/min, according to the size of the profile shown in Figure 3, the template is precisely numerically processed to obtain the final size parts, and the processing is completed.

Claims (3)

1. a frame mold method for fast mfg, it is characterised in that the method includes the steps of:

Step one, material and equipment prepare: prepare corresponding size according to the requirement of frame mold shape and performance Template and frame structure with material；Progressive molding is made as blank processed using wooden high density fiberboard Use in journey is wood mold coupled；

Step 2, progressive molding technology shape profile: wood mold coupled and template are fixed to progressive molding equipment On, use progressive molding technology, make template forming go out the molding surface size of the frame mold designed；

Step 3, mould structure are strengthened: after the template surface of frame mold machines, from progressive molding Take off on lathe, by template and frame structure formation welded together frame mold；

Step 4, heat treatment: use Equipment for Heating Processing, frame mold is put in Equipment for Heating Processing, passes through Heat treatment technics, makes frame mold reach mold use requirement；

The micro-process of step 5, die surface: after heat treatment completes, frame mold is installed to progressive molding Equipment or numerically controlled processing equipment, require to carry out the accurate digital control processing of profile, obtain according to part final size Final size part, process finishing.

A kind of frame mold method for fast mfg the most according to claim 1, it is characterised in that: step One middle frame structure is the stressing conditions according to frame mold, is ensureing the rigidity of mould and is effectively propping up template On the basis of support, use welding equipment, by the supporting construction of Plate Welding.

A kind of frame mold method for fast mfg the most according to claim 1, it is characterised in that: step Heat treatment technics in four refers to stress relief annealing, eliminates the thermal stress of machining stress and welding generation to framework The material of mould carries out heat treatment reinforcement.