CN114274502A - The method of using 3D printing technology to quickly prepare master mold and remake glass fiber reinforced plastic mold - Google Patents

Abstract

The invention discloses a method for quickly preparing a master mold and reproducing a glass fiber reinforced plastic mold by using 3D printing technology, including the preparation of the master mold: using three-dimensional modeling software to design a master mold model drawing and slicing the model, and slice the 3D model drawing. Use chopped fiber reinforced resin as raw material to print resin mold with 3D equipment; remake FRP mold: spray gel coat on the surface of master mold, polish and polish after curing, and then use master mold as template to lay continuous glass infiltrated with mold resin layer by layer Fiber cloth, and then heat to solidify the mold; use chopped fiber reinforced 3D printing resin material as the master mold material to solve the problem of poor dimensional stability of the material, and combine 3D printing rapid prototyping technology to solve the traditional molding process of the mold. Complex and long cycle problems.

Description

The method of using 3D printing technology to quickly prepare master mold and remake glass fiber reinforced plastic mold

technical field

The invention relates to the field of mold processing, in particular to a method for rapidly preparing a master mold and remaking a glass fiber reinforced plastic mold by using a 3D printing technology.

Background technique

The basic principle of 3D printing technology is that the digital light source projects layer by layer on the surface of the liquid photosensitive resin in the form of surface light, and solidifies layer by layer. This technology has the advantages of fast printing speed, high precision, and high material utilization; chopped fiber reinforced The resin material is a high-performance, high-dimensionally stable resin material that uses chopped fibers as reinforcement to add traditional 3D printing resins. In the patent CN113320073A "A 3D Printing Manufacturing Method for Manufacture of Foamed Mould Cavity Using Chemical Foaming Agent", the material used for preparing the mould is traditional 3D printing resin, and the parts prepared from this material have relatively large moulds when used for a long time. There is a risk of deformation, and the patent is to directly use 3D printing technology to print molds, not to print master molds and remake FRP molds that can be used for a long time. The mixture is used to make gypsum board, which is engraved into a master mold by laser, and then hand-laid to form a glass fiber reinforced plastic mold.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a method for quickly preparing a master mold and remaking a glass fiber reinforced plastic mold by using 3D printing technology, using chopped fiber reinforced 3D printing resin material as the master mold material to solve the problem of poor material dimensional stability, combined with 3D printing rapid prototyping technology solves the problems of complex traditional molding process and long cycle.

The method for rapidly preparing a master mold and remaking a glass fiber reinforced plastic mold by utilizing the 3D printing technology of the present invention comprises the following steps:

a. Preparation of master mold: use 3D modeling software to design master mold model drawings and slice the model, and use chopped fiber reinforced resin as raw material to print the resin mold with 3D equipment after the sliced 3D model drawings;

b. Remaking the glass fiber reinforced plastic mold: spray gel coat on the surface of the master mold, polish and polish after curing, and then use the master mold as a template to lay continuous glass fiber cloth infiltrated with mold resin layer by layer, and then heat and cure the mold;

Further, in step a, the printing layer thickness is 0.02-0.15mm, and the printing speed is 1-120cm/h;

Further, in step a, the chopped fiber reinforced resin is one or more mixtures of glass fiber reinforced resin, carbon fiber reinforced resin, basalt fiber reinforced resin, and aramid fiber reinforced resin;

Further, in step a, the three-dimensional modeling software includes one or more of CATIA, UG, Solidworks, PRO/E, and 3D Max, and the 3D printing device includes one or more of DLP, SLS, SLA, and FDM. species or several;

Further, in step a, for the master mold model whose size exceeds the single printing range of the 3D printing equipment, it can be divided into modules, and after the printing is completed, mechanical connection or adhesive bonding is used;

Further, in step b, the specification of the continuous glass fiber cloth is at least one of 150g/㎡, 450g/㎡, 600g/㎡, 1200g/㎡, and 1250g/㎡;

Further, in step b, the mold resin is one or more mixtures of epoxy mold resin, phenolic mold resin, vinyl mold resin, unsaturated mold resin, and zero-shrinkage mold resin.

Beneficial effects of the present invention: the present invention uses 3D printing technology to rapidly prepare master molds and remake FRP molds, and the FRP molds prepared by using the method have the characteristics of simple process steps, high dimensional stability of materials, not easy to deform, and satisfying mass production. . Among them, the use of chopped fiber reinforced resin as the raw material for printing the master mold has the advantages of higher mechanical properties and higher product dimensional stability than traditional 3D printing resins; and the higher the dimensional stability of the raw materials used in the master mold, the subsequent preparation The consistency of the FRP mold is better. The model drawings are printed with 3D printing technology to form the master mold, which reduces the preparation of large-size materials and laser engraving compared with the traditional process. The process is simpler, the process is less time-consuming, and the efficiency is higher.

Detailed ways

For better understanding of the present invention, the following examples are further descriptions of the present invention, but the content of the present invention is not limited to the following examples.

In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used can be obtained from commercial sources unless otherwise specified.

The standard of the mechanical property test of the material of the present invention is as follows:

Test standard for tensile properties and elongation at break: GB/T 1447-2005 "Test methods for tensile properties of fiber-reinforced plastics"

Test method for dimensional stability of the sample: place the standard tensile sample bar at room temperature for 30 days, and then use a vernier caliper to test the projected length and projected width of the sample;

In order to demonstrate the advantages of the present invention, it is important to compare the use of chopped fiber reinforced resin and conventional resin to print standard tensile splines (the control printing equipment and surrounding environment are the same); Each example has a comparative test, which is referred to as an example in the present invention.

Example 1

The 3D printing technology of this embodiment quickly prepares a master mold and a method for remaking a FRP mold, including the following steps:

a. Model printing: Slice and slice the master mold model drawings with a size of 50cm×50cm, with a layer thickness of 0.025mm, import the sliced 3D model drawings, and the equipment printing layer thickness is 0.025mm, using chopped glass fiber reinforced resin as the Master mold material, start printing, then clean up to confirm the final shape of the mold.

b. Remaking the FRP mold: spray the mold gel coat resin on the surface of the master mold, the resin type is vinyl gel coat resin, and the spray thickness is 0.5mm; after the mold gel coat is initially solidified, lay glass fiber fabric layer by layer, the specifications include 150g/ ㎡, 450g/㎡, 600g/㎡, 1200g/㎡, 1250g/㎡, at the same time, iron rollers should be used to flatten the fabric to remove air bubbles to make the glue uniform. After reaching the specified thickness, the layering is completed; the mold is heated and cured, and finally used High-pressure air or manual mold removal to obtain FRP molds.

Standard tensile specimens were printed using chopped glass fiber reinforced resin to test mechanical properties and dimensional stability.

Comparative Example 1: Preparation of FRP Mould Using Traditional Process

1. Preparation of gypsum board: Use wood or silicone to order a rectangular frame, then pour the gypsum powder mixture into the frame to make gypsum board, and let it sit for curing.

2. Rough repair of the master mold: import the drawings into the lathe to carve the gypsum board. This process is mainly to do the basic treatment of the master mold as a whole to ensure that the size and form of the wooden mold are consistent with the drawings.

3. Refining the surface of the master mold: This process is mainly to do fine surface treatment of the master mold as a whole, mainly including overall grinding, polishing, and demoulding wax.

4. Remaking the glass fiber reinforced plastic mold: spray the mold gel coat resin on the surface of the master mold, the resin type is vinyl gel coat resin, and the spray thickness is 0.5mm; ㎡, 450g/㎡, 600g/㎡, 1200g/㎡, 1250g/㎡, at the same time, iron rollers should be used to flatten the fabric, remove air bubbles, and make the glue uniform. After reaching the specified thickness, the layering is completed; the mold is heated and cured.

5. FRP mold demoulding: use high-pressure gas or artificial mold to obtain FRP mold.

Standard tensile specimens were printed using conventional resins (without chopped fiber reinforcement) and tested for mechanical properties and dimensional stability.

Table 1 Embodiment 1 and comparative example 1 process steps comparison situation

Judging from the comparison between Example 1 and Comparative Example 1, according to the present invention, the master mold can be prepared by 3D printing technology and the FRP mold can be remade, and the process steps of remaking the FRP mold are fewer than the traditional ones, and the process flow is less. Relatively simple and more efficient.

Table 2 Performance comparison of embodiment 1 and comparative example 1

From the comparison of Example 2 and Comparative Example 2, according to the present invention, the use of chopped fiber reinforced resin material combined with 3D printing technology to achieve better dimensional stability of printed parts.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent substitutions without departing from the spirit and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims (7)

1. A method for rapidly preparing a female die and duplicating a glass fiber reinforced plastic die by using a 3D printing technology is characterized by comprising the following steps of: the method comprises the following steps:

a. preparing a female die: designing a female die model drawing by using three-dimensional modeling software, carrying out model slicing, and printing a sliced 3D model drawing into a resin die by using 3D equipment by using chopped fiber reinforced resin as a raw material;

b. copying a glass fiber reinforced plastic mold: and spraying gel coat on the surface of the female die, polishing and grinding after curing, then paving continuous glass fiber cloth soaked by the resin of the die layer by taking the female die as a template, and then heating and curing the die.

2. The method for rapidly preparing the female die and reproducing the glass fiber reinforced plastic die by using the 3D printing technology as claimed in claim 1, wherein: in the step a, the thickness of the printing layer is 0.02-0.15 mm.

3. The method for rapidly preparing the female die and reproducing the glass fiber reinforced plastic die by using the 3D printing technology as claimed in claim 2, wherein: in the step a, the chopped fiber reinforced resin is one or a mixture of more than two of glass fiber reinforced resin, carbon fiber reinforced resin, basalt fiber reinforced resin and aramid fiber reinforced resin.

4. The method for rapidly preparing the female die and reproducing the glass fiber reinforced plastic die by using the 3D printing technology as claimed in claim 3, wherein: in the step a, the three-dimensional modeling software comprises one or more of CATIA, UG, Solidworks, PRO/E and 3D Max, and the 3D printing equipment comprises one or more of DLP, SLS, SLA and FDM.

5. The method for rapidly preparing the female die and reproducing the glass fiber reinforced plastic die by using the 3D printing technology as claimed in claim 4, wherein the method comprises the following steps: in the step a, a female die model with the size exceeding the single printing range of the 3D printing equipment can be split in a modularized mode, and after the female die model is completely printed, mechanical connection or adhesive bonding is used.

6. The method for rapidly preparing the female die and reproducing the glass fiber reinforced plastic die by using the 3D printing technology as claimed in claim 1, wherein: in the step b, the continuous glass fiber cloth has at least one specification of 150 g/square meter, 450 g/square meter, 600 g/square meter, 1200 g/square meter and 1250 g/square meter.

7. The method for rapidly preparing the female die and reproducing the glass fiber reinforced plastic die by using the 3D printing technology as claimed in claim 6, wherein: in the step b, the mold resin is one or a mixture of more than two of epoxy mold resin, phenolic mold resin, vinyl mold resin, unsaturated mold resin and zero shrinkage mold resin.