CN112008037A - Combined mold - Google Patents

Abstract

The utility model provides an assembled die, includes along with type mould and support mould, includes main part, strengthening layer, working face and equipment face along with the type mould, and the main part is suppressed or is printed by particulate material and form, and the main part surface sets up the strengthening layer, perhaps strengthening layer infiltration main part surface, and the main part is the working face with the one side of sand mould die cavity contact, and relative another side is the equipment face, supports the mould and installs in main part equipment face one side, and shape and equipment face shape phase-match. The particle material which is convenient to form is printed or pressed into a random mold, the advantage of the particle material which is convenient to form is utilized, the defect that the hardness of the particle material is not enough is overcome by the aid of the reinforced layer with high tensile strength and hardness, the problem of integral tensile strength and hardness is solved by taking the supporting mold as a filling material, the integral quality can be light, the defects are overcome by the aid of the method, and the combined mold integrates the advantages.

Description

Combined mold

technical field

The invention relates to the technical field of casting molds, in particular to a combined mold.

Background technique

The bottleneck of new products in the foundry industry lies in mold development. The speed of mold development determines the length of the development cycle of new products. Existing molds have their own advantages and disadvantages. Traditional wooden molds have low cost and can be used repeatedly but have a long development cycle, especially complex It is more difficult to make and has poor repeatability; the traditional lost foam is low in cost and requires mechanical processing, but cannot be used repeatedly; the traditional metal mold has a long production cycle and can be used repeatedly, but it is not suitable for large parts, and High cost; the emerging FDM molds and SLA molds are all printed and formed, and the use effect is good but the cost is too high.

Therefore, the mold development cycle is shortened, the mold manufacturing cost is reduced, the molds that can be used repeatedly, and the molds that can adapt to various complex structural designs are the most needed molds in the industry.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the present invention provides a combined mold. One aspect disclosed by the present invention solves the technical problems that the mold development cycle is long, the cost is high, the mold cannot be used repeatedly, and the complex casting mold is difficult to process.

A technical scheme adopted by the present invention to solve its technical problem is:

A combined mold includes a follow-up mold and a support mold. The follow-up mold includes a main body, a reinforcement layer, a working surface and an assembly surface. The main body is pressed or printed from granular materials, and a reinforcement layer is arranged on the surface of the main body, or the reinforcement layer penetrates into the main body. On the surface, the side of the main body in contact with the sand mold cavity is the working surface, and the opposite side is the assembly surface.

Use the easy-to-shape granular material to print or press to become a follow-up mold, take advantage of the convenient molding of this granular material, and use the reinforcement layer with high tensile strength and hardness to make up for the lack of hardness of the granular material, and the supporting mold is used as a filling material. , to solve the problems of overall tensile strength and hardness, and at the same time, the overall quality can be light, so as to obtain a combined mold that makes up for each other's shortcomings and integrates various advantages.

Preferably, the main body is made of 5-2000 mesh granular materials, which can be silica sand, fused silica, fused corundum particles, mullite particles, sillimanite particles, kaolinite clinker, refractory clay, zircon sand , at least one of rutile particles, spinel particles, magnesium oxide, calcium oxide, ceramsite sand, complex ore sand, silicon carbide powder, silicon nitride powder, alumina powder, and starch.

The use of granular materials is because of the advantages of easy molding of granular materials. All of the above granular materials can be formed, and different materials can be selected to meet different needs. At present, the most commonly used silica sand is silica sand, which can be reused and is especially suitable for industrial production. , but the production requirements of some special industries or fine industries will be different, so it is necessary to choose suitable materials as the particle materials for the main body of the mold.

Preferably, the reinforcement layer is attached to the main body when it is in a liquid state, and the reinforcement layer is solid after curing. The hardness of the main body with the reinforcement layer attached is not lower than 85HD, and the tensile strength is not lower than 15MPa.

The reinforcement layer material is attached to the main body in a liquid state, and can penetrate into the main body made of granular material. After curing into a solid state in the later stage, it becomes one with the main body. Otherwise, it will not have the effect of strengthening, so that the main body with the strengthening layer has the hardness and tensile strength that it should have as a mold, so that it can be modeled under a certain pressure.

Preferably, the reinforcing layer is made of furan resin, polyurea resin, modified polyurea resin, polyurethane resin, phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, epoxy resin, polyurethane modified silicone resin, Xanthan gum, polyvinyl acetate emulsion, polyacrylamide, ethyl silicate, silica sol, sulfate, rosin, syrup, Tianqing gum, coal tar, asphalt, polyvinyl acetal, ethylene-vinyl acetate copolymer , phenolic-nitrile rubber, phenolic-chloroprene rubber, phenolic-polyurethane rubber, epoxy-nitrile rubber, unsaturated polyester, acrylic resin, polyimide, polybenzimidazole, phenolic-polyvinyl acetal , phenolic-polyamide, epoxy-polyamide, vinyl polymers, polyvinyl acetate, polyvinyl alcohol, perchloroethylene, polyisobutylene, polyester, polyether, polyamide, polyacrylate, a-cyano Acrylate, epoxy-polysulfide glue, silicone resin, furan resin, perchloride, polyisobutylene, polyester, polyether, polyamide, polyacrylate, a-cyanoacrylate, polyvinyl acetal, At least one of epoxy resin AB glue, epoxy-polyamide AB glue, and phenolic-epoxy resin AB glue is made.

The use of any of the above materials can meet the requirements of the previous article, can be attached to the main body, and the hardness of curing can meet the requirements, and the above materials have a characteristic that they are liquid before curing, which is convenient for painting or After spraying or soaking, it can penetrate into the granular material, and after reaching a certain temperature for curing, it can maintain the cured state at room temperature, and has high hardness and strength, which is convenient for industrial production and processing, and can meet the requirements of tensile strength and hardness.

Preferably, the reinforcement layer penetrates into the surface of the main body by at least 2 mm.

It can be seen from the above that the reason for selecting granular materials is that there are gaps between the granular materials, which can allow the reinforcement layer to penetrate, so as to have an effect. Whether it is too dense between the particles or the reinforcement layer cannot penetrate, it will lead to failure to meet the requirements. Therefore, the penetration depth is also the guarantee of tensile strength and hardness. In theory, the deeper the penetration, the better the effect. However, when the penetration reaches 2 mm, the initial tensile strength and hardness requirements can be met, so the reinforcement layer penetrates at least 2 mm.

Preferably, the main body includes a splicing body and a connecting block, and the main body is formed by splicing at least two splicing bodies; the connecting block is connected with at least two adjacent splicing bodies at the same time, and the at least two splicing bodies are relatively fixed; , wherein the connecting block is butterfly-shaped or flower-shaped.

The theme is decomposed into several splices, which is convenient to make large molds. When making some large castings, the corresponding molds are also huge. They are designed to be spliced to reduce the production volume. Transshipment and transportation. The adjacent splicing bodies are connected by connecting blocks, so that the adjacent splicing bodies are relatively fixed without relative displacement, and a complete body is finally assembled. The connection block is generally set horizontally,

Preferably, the splicing body further comprises a card slot, and the adjacent splicing bodies are respectively provided with mutually matching protruding or concave card slots, that is, the adjacent splicing bodies are spliced and formed by placing the protruding body in the depression. .

The connection blocks are generally set horizontally, so the vertical direction is generally selected to connect the splices through protrusions or depressions, so as to limit the movement of the two splices in the horizontal direction, and at the same time, the connection between the splices is more stable.

Preferably, the main body further comprises a reinforcing rib, the main body is a double layer or a multi-layered structure with a hollow interlayer, and a reinforcing rib is arranged between the two-layer structure, and the two ends of the reinforcing rib are respectively connected to the two-layer structure, The double or multi-layer is integrally formed with the reinforcing rib.

To increase the hardness of the main body printed from the granular material, it is to increase the thickness, which will increase the quality of the entire mold, which is very inconvenient for handling and assembly. It is made of reinforcing ribs, which can improve the hardness and reduce the quality, killing two birds with one stone. The addition of the reinforcement layer will increase the overall hardness and tensile strength of the main body, so this double layer or multi-layer will not only not reduce the overall strength, but also increase the overall hardness and reduce the thickness of the main body due to the layer frame of the reinforcement layer area. .

Preferably, the supporting mold is made of at least one material from wood, metal and resin.

If the mold is hollow, it will have better requirements for tensile strength and hardness. Therefore, a material with a certain tensile strength and hardness should be used to make the support mold, and the cavity on the side of the assembly surface of the mold should be filled, so that the entire mold is assembled. Die tensile strength and hardness are improved.

Preferably, the supporting mold is hollow or grid-shaped.

At the same time, the quality of the support mold should be considered. Overweight flowers are inconvenient to flip, handle and use. Therefore, when the tensile strength and hardness are suitable, the mass should be reduced as much as possible to obtain a lightweight support mold.

Preferably, the outer contour of the supporting mold is consistent with the outer contour of the three-dimensional shape composed of at least one cube and/or at least one cuboid.

This requires that the support mold is easy to manufacture and will not rotate relative to the mold. Simple cubes or cuboids can be obtained by using long strips or plates of materials, and there is no need to reprocess them into arc-shaped circles and other shapes to reduce the support. The processing difficulty of the mold increases the processing efficiency, and the support mold can be obtained faster and better. Even the same type of support mold can be produced in batches, and the matching molds of different types can be matched to achieve the effect of rapid assembly.

Preferably, the assembly surface is in complete contact with the support mold, and the surface of the support mold in contact with the assembly surface is a flat plane.

This is to prevent gaps or cavities between the assembly surface and the support surface, resulting in weak points. By designing the shape of the assembly surface and covering the outer side of the support mold with a flat plate, the assembly surface and the support surface can be connected to each other. Complete contact, improve the overall hardness, reduce the force per unit area.

Preferably, the assembly surface includes a mounting structure A, the support mold includes a mounting structure B, the mounting structure A on the assembly surface is protruding or concave, and the mounting structure B on the corresponding support mold is a corresponding concave or convex, The assembling surface and the supporting mold are relatively fixed by protruding and arranging in the recess.

Using this method of protruding and clipping in the recess relatively fixes the assembly surface and the supporting mold, on the one hand, it is easy to manufacture and easy to assemble, and on the other hand, it increases the assembly area, improves the stability, and prolongs the service life. Preferably, an inwardly concave trapezoid is designed on the assembly surface, and a correspondingly outwardly protruding trapezoid is designed on the outside of the support mold. The trapezoid is small at the top and large at the bottom. After such installation, the conformal mold and the support mold are limited. The relative movement in the vertical direction is more stable.

Preferably, a riveting rod is also included, and the riveting rod penetrates the following mold and the supporting mold at the same time to relatively fix the following mold and the supporting mold.

Preferably, the riveting rod includes a cap body at the upper end and a rod body at the lower end, the cross-sectional area of the cap body is larger than the cross-sectional area of the rod body, and the cap body is arranged in the conforming mold.

The riveting rod is used to fix the multi-type and follow-up molds or support molds at the same time, which improves the overall wedge degree, and facilitates operation and assembly, so that the overall stability is improved.

Preferably, the main body further includes a riveting hole, the main body is a double layer or a multi-layer with a cavity in the interlayer, and the riveting hole is arranged in the double or multi-layer cavity or the riveting type A hole penetrates the main body, and the riveting rod is disposed in the riveting hole.

The cavity of the interlayer is used to accommodate the riveting rod, which increases the contact surface, facilitates design, and is more convenient to assemble, and does not protrude from the surface, improves the structural stability, and is more convenient to relatively fix the main bodies of different layers.

Preferably, it also includes a bottom plate, the bottom plate is provided with the following mold and the supporting mold, the supporting mold is fixed on the bottom plate, and the riveting rod passes through the conforming mold, the supporting mold and the bottom plate.

Designing the bottom plate for the mold is convenient for later modeling work, and it is convenient for hoisting and transportation. After the bottom plate is installed, the mold, the supporting mold and the bottom plate are fixed, and the integrated type is better, and it is convenient for transportation and use.

Preferably, it also includes suspenders, two protruding suspenders are arranged on both sides of the follower mold, and the intersections of all the suspenders coincide with the center of gravity.

Preferably, it also includes a hoisting hole, the top surface of the follower mold is provided with a hoisting hole, the hoisting hole has a circular cavity, and an elongated opening is arranged on the upper part of the cavity, and the length of the elongated opening is Consistent with the diameter of the circular cavity, the spreader is an inverted T-shaped. After the bottom end is put into the cavity from the elongated opening, the spreader rotates 90° to get stuck in the cavity, thereby hoisting the mold.

The hoisting handle and the hoisting hole designed at the back are for the convenience of transferring the combined mold, because if you want to make a large sand mold, the corresponding combined mold is also very large, so to facilitate transportation, use the hoisting hole for the light one, and the heavy one. Just use the sling or with the bottom plate for transportation.

It can be seen from the above technical solutions that one of the beneficial effects of the disclosed aspect of the present invention is that it is preferable to use silica sand to make the main body. By adding a strengthening layer, the shortcoming of the low hardness of the sand mold itself is overcome, so that the sand mold can be used as a mold. The hardness requirements are high, and the cost is low. Silica sand can be recycled and reused. The speed of sand mold design and printing or pressing is fast, and the cycle is short. Simple structures can be pressed quickly, and complex structures can be printed by additive printing once. Printing and molding, high precision, convenient and fast manufacturing, that is, the use of sand molding is easy. On the other hand, wood, metal or resin is used as a support mold, and this material with certain hardness and tensile strength is used to make a hollow or grid shape, and a light and certain hardness support mold is obtained as a support, using these materials It has advantages in hardness, and it is made into grids and hollows to reduce weight. There are advantages in various aspects. The final result is a new type of mold with low quality, sufficient hardness and high shape accuracy. It has the advantages of short development cycle and low cost. Low cost, can be used repeatedly, complex molds can still be processed quickly and so on.

Description of drawings

FIG. 1 is a schematic structural diagram of a combined mold according to an embodiment disclosed in the present invention after a splicing body is hidden.

FIG. 2 is a cross-sectional view of FIG. 1 .

FIG. 3 is a schematic structural diagram of a conformal mold of a combined mold according to an embodiment of the present disclosure.

FIG. 4 is a cross-sectional view of the structure shown in FIG. 3 .

FIG. 5 is a cross-sectional view of the structure shown in FIG. 3 from another angle.

FIG. 6 is a bottom view of the structure shown in FIG. 3 .

FIG. 7 is a schematic structural diagram of a supporting mold of a combined mold according to an embodiment of the present disclosure.

FIG. 8 is an elevation view of the structure shown in FIG. 7 .

FIG. 9 is a cross-sectional view of the structure shown in FIG. 7 .

FIG. 10 is a schematic structural diagram of a supporting mold of a combined mold according to an embodiment of the present disclosure.

FIG. 11 is a schematic structural diagram of a conformal mold of a combined mold according to an embodiment of the present disclosure.

FIG. 12 is a bottom view of the structure shown in FIG. 11 .

Fig. 13 is a schematic diagram of the structure of the combined mold assembled with the structures shown in Fig. 10 and Fig. 11 .

In the figure: follower mold 10, main body 11, splicing body 110, connecting block 111, card slot 112, reinforcing rib 113, riveting hole 114, reinforcing layer 12, working surface 13, assembly surface 14, installation structure A140, supporting mold 20. Installation structure B21, riveting rod 30, bottom plate 40, hanging handle 50, and lifting hole 60.

Detailed ways

With reference to the accompanying drawings of the present invention, a technical solution of the embodiment of the present invention is further elaborated.

Molds are very important in the casting industry. The existing molds have their own advantages and disadvantages. The development of molds is very slow. Because there are not many suitable ones, traditional molds still occupy the vast majority. With the development of technology, 3DP molding technology is one of the most widely used additive manufacturing technologies. It mainly uses powder material layer by layer and then prints by spraying adhesive. The powder material can be silica sand, ceramic powder, metal powder. , sand grains, etc., now the sand is mainly printed out by sand grains. Additive manufacturing has a significant advantage, that is, complex shapes can still be quickly designed through software, but if used as a mold, it has a fatal disadvantage, that is, it cannot meet the hardness and tensile strength requirements of the mold. Therefore, additive manufacturing has always been printing sand molds, and no one has ever considered using additively manufactured products as molds. Consider the cost of molds, reduce costs and improve quality and efficiency. The printing cost of 3DP sand mold is 0.6-0.7 times that of wood mold. The use of 3DP sand mold can greatly reduce the cost of mold and improve production efficiency.

In order to solve the problem of insufficient surface hardness and tensile strength of the sand mold, a reinforcing layer 12 is arranged on the surface of the sand mold, which doubles the surface hardness and tensile strength, meets the requirements of the mold, ensures sufficient repeated use times, and is easy to use and form. The granular material is printed or pressed into a follow-up mold, and the advantage of this granular material is used to facilitate molding. The reinforcing layer 12 with high tensile strength and hardness is used to make up for the insufficient hardness of the granular material, and the supporting mold 20 is used as a filling material to solve the problem. The problem of overall tensile strength and hardness can also make the overall quality lightweight, so that a combined mold that makes up for each other's shortcomings and integrates various advantages can be obtained.

Example 1:

A combined mold includes a follow-up mold 10, a support mold 20 and a riveting rod 30. The follow-up mold 10 includes a main body 11, a reinforcing layer 12, a working surface 13 and an assembly surface 14. The main body 11 is pressed or printed by granular materials. The surface of the main body 11 is provided with the reinforcement layer 12, or the reinforcement layer 12 penetrates into the surface of the main body 11. The side of the main body 11 in contact with the sand mold cavity is the working surface 13, and the opposite side is the assembly surface 14. The supporting mold 20 is installed on the main body 11. One side of the assembly surface 14, and the shape matches the shape of the assembly surface 14, because some molds are for forming the external structure of the casting, such as shown in Figures 10-13, and some are for forming the inner cavity structure of the casting, as shown in Figures 1-9. , so there will be differences, but in general, the working surface 13 of the mold 10 is the side that contacts the sand mold cavity, and the opposite side is the assembly surface 14, which is connected to the support mold 20.

Referring to FIG. 7 and FIG. 5 , the assembly surface 14 includes a mounting structure A140 , the support mold 20 includes a mounting structure B21 , and the mounting structure A140 of the assembly surface 14 is protruded or recessed, corresponding to the mounting structure on the support mold 20 . The structure B21 is a corresponding depression or protrusion, and the assembly surface 14 and the supporting mold 20 are relatively fixed by placing the protrusion in the depression.

Referring to Figures 1 and 2, the riveting rod 30 penetrates the following mold 10 and the supporting mold 20 at the same time to relatively fix the following mold 10 and the supporting mold 20. The riveting rod 30 includes The cap body at the upper end and the rod body at the lower end, the cross-sectional area of the cap body is larger than the cross-sectional area of the rod body, and the cap body is arranged in the conforming mold.

The main body 11 is composed of silica sand, fused silica, fused corundum particles, mullite particles, sillimanite particles, kaolinite clinker, refractory clay, zircon sand, rutile particles, spinel particles, magnesium oxide, calcium oxide , ceramsite sand, complex ore sand, silicon carbide powder, silicon nitride powder, alumina powder, starch made of at least one granular material, the granular material is 5-2000 mesh, the best is 70-800 mesh particles material.

When the reinforcement layer 12 is in a liquid state, it is attached to the main body 11. Because the main body 11 is granular, it is convenient for the reinforcement layer 12 to be attached to the main body 11 by at least 2 mm or penetrated into the main body 11 by at least 2 mm. The hardness of the main body 11 of the reinforcement layer 12 is not lower than 85HD, and the tensile strength is not lower than 15MPa.

The reinforcing layer 12 includes epoxy resin AB glue, epoxy-polyamide AB glue, phenolic-epoxy AB glue, phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, epoxy resin, silicone resin, furan resin, Unsaturated polyester, acrylic resin, polyimide, polybenzimidazole, phenolic-polyvinyl acetal, phenolic-polyamide, epoxy-polyamide, vinyl polymer, polyester, polyether, polyamide , polyacrylate, a-cyanoacrylate, polyvinyl acetal, ethylene-vinyl acetate copolymer, phenolic-nitrile rubber, phenolic-chloroprene, phenolic-polyurethane, epoxy-nitrile, At least one of epoxy-polysulfide glue.

Referring to FIGS. 7-9 , the supporting mold 20 is hollow-shaped or grid-shaped, which is made of at least one material from wood, metal, and resin. This saves weight while still meeting support requirements. The thickness of the raw material plate of the supporting mold 20 is 80-120 mm, and the grid spacing of the supporting mold 20 is 150-250 mm, so that the material used is reduced and the structure is stable.

The above is an assembly mold that is integrally formed with the mold 10, which is suitable for molds with a small volume. It uses the advantages of granular materials to facilitate molding, and cooperates with the characteristics of high hardness and tensile strength of the reinforcement layer 12. The shell-like structure with the matching cavity shape is filled with a hollow-shaped supporting mold 20, and the supporting mold 20 is stronger in hardness and light in weight, so as to obtain an assembly mold.

Example 2:

On the basis of Embodiment 1, as shown in Figures 3-6, the main body 11 further includes reinforcing ribs 113, the main body 11 is made into a double layer, and the main body 11 is a double layer or a multi-layer in which the interlayer is a cavity, A reinforcing rib 113 is arranged between the two-layer structure, two ends of the reinforcing rib 113 are respectively connected with the two-layer structure, and the two-layer or multi-layer is integrally formed with the reinforcing rib 113 . The wall thickness of each layer is 20-50 mm. The spacing between the reinforcing ribs 113 is 100-300 mm.

After the main body 11 is made into two layers or multiple layers, the reinforcement layer 12 is attached or infiltrated on the surface to obtain a follow-up mold 10, which reduces the quality of the main body 11 and increases the area of the reinforcement layer 12, thereby improving the follow-type mold 10. The overall hardness and tensile strength result in a conformal mold 10 that is lighter in weight and higher in strength and hardness.

Example 3:

On the basis of Embodiment 1 or Embodiment 2, the main body 11 includes a splicing body 110, a connecting block 111, and a slot 112, and the main body 11 is formed by splicing at least two splicing bodies 110; the connecting block 111 is simultaneously formed with at least two splicing bodies 110 Adjacent splicing bodies 110 are connected, and at least two splicing bodies 110 are relatively fixed. The adjacent splicing bodies 110 are respectively provided with mutually matching protruding or concave card slots 112 , that is, the adjacent splicing bodies 110 are spliced and formed by being protruded and placed in the concave.

Referring to Figures 1 and 3, the adjacent splicing bodies 110 are connected together by connecting blocks 111 or card slots 112, so that the splicing bodies 110 become a whole. Generally, the butterfly-shaped or flower-shaped connecting blocks 111 are horizontal. The splicing body 110 is arranged and connected, and the splicing body 110 is connected vertically through the protruding and recessed card slots 112, so that the splicing body 110 is defined from all directions, so that the splicing body 110 becomes a whole.

Example 4:

On the basis of Embodiment 1-3, it further includes a bottom plate 40 , a hanging handle 50 and a lifting hole 60 . The bottom plate 40 is provided with the following mold 10 and a supporting mold 20 , and the supporting mold 20 is fixed on the bottom plate 40 . On the other hand, the riveting rod 30 penetrates the following mold 10 , the supporting mold 20 and the bottom plate 40 at the same time. The hanger 50 is provided with two protruding hangers 50 on both sides of the mold, the hangers 50 protrude by about 50 mm, and the end faces are designed with anti-skid bosses. The intersection of all the suspenders 50 coincides with the center of gravity. The lifting hole 60 is arranged on the top surface of the mold 10. The lifting hole 60 has a circular cavity, and an elongated opening is arranged on the upper part of the cavity. The length of the elongated opening is the same as the diameter of the circular cavity. Consistently, the spreader is an inverted T-shaped, and after the bottom end is put into the cavity from the elongated opening, the spreader rotates 90° so as to be stuck in the cavity, thereby hoisting the follower mold 10 .

The designed bottom plate 40, hoisting handle 50 and hoisting hole 60 are all used to facilitate the transfer of combined molds, because if a large-scale sand mold is to be made, the corresponding combined mold is also very large, so it is convenient to transport, and light weight is used. If the hole 60 is heavy, the lifting handle 50 or the bottom plate 40 is used for transportation.

Example 5:

The supporting mold 20 in any of the above embodiments is optimally designed such that the outer contour of the supporting mold 20 is consistent with the outer contour of the three-dimensional shape composed of at least one cube and/or at least one rectangular parallelepiped. At the same time, the assembly surface 14 is in complete contact with the support mold 20 , and the surface of the support mold 20 in contact with the assembly surface 14 is a flat plane. That is, the outermost layer of the skin of the mold 20 is supported by the grid or hollowed-out above, and the thickness of the outermost layer is about 12 mm.

The optimally designed support mold 20 is formed by stacking simple cubes or cuboids, and can be expanded into simple three-dimensional shapes such as spheres, cylinders, cones, etc. . The side of the assembly surface 14 in contact with the supporting mold 20 is in complete contact, which prevents the stress from increasing due to voids, and becomes a weak point and damages when the mold 10 is subjected to excessive pressure.

During industrial production, some general support molds 20 of different specifications can be spliced out in batches. The support molds 20 of the same specification can be combined with the mold-type molds 10 of different specifications. The working surface 13 of the mold-type mold 10 is shaped according to the shape of the sand mold cavity. Design, the assembly surface 14 of the conformable mold 10 with a size within a certain range is one specification, and is consistent with the supporting mold 20 of the corresponding specification, which can save time, realize rapid assembly, and improve work efficiency. Even in the case where the supporting mold 20 is limited, one supporting mold 20 and a plurality of conforming molds 10 can be quickly and separately combined as required. Moreover, when the conforming mold 10 or the supporting mold 20 is damaged, the other one is reserved, which can achieve high utilization rate.

In all the above embodiments, the follow-up mold is made of granular material, and then the reinforcement layer is applied. The hardness and tensile strength of the pure main body and the main body coated with the reinforcement layer are tested. The specific experimental results are as follows.

That is, using silica sand particles to obtain the main body by 3D printing, and carry out a comparative experiment to compare the performance of the main body without the reinforcing agent (before treatment) and the main body with the reinforcing agent (after treatment) described in this scheme, and the results are as follows. .

Table 1 Performance comparison before and after treatment

It can be seen from Table 1 that the tensile strength and hardness of the model are greatly improved after treatment, especially the tensile strength is as high as 20Mpa, which is almost ten times that before no treatment; the hardness is up to 98HD. It solves the problem that the model is easily broken and damaged during use, movement, handling or transportation due to its low hardness and hardness.

Therefore, it can be seen that the following mold can fully achieve the required tensile strength and hardness, and can be competent for the work of the mold.

The specific design process of any of the above-mentioned embodiments is as follows:

The specific assembly mold is designed according to the needs. When the mold is a large mold, the shape of the main body 11 of the mold 10 is firstly divided into several splices 110, and then two or more layers are designed, and then the position of the reinforcing ribs 113 is designed. The position of the connecting block 111, and at the same time, a depression matching the connecting block 111 is set on the corresponding splicing body 110. If it is printed and formed, the riveting holes 114 in the double-layer cavity are designed and printed together at the beginning. , such an integral molding, design the position and shape of the slot 112 between the upper and lower connecting bodies, and design the outer contour of the support mold 20 at the same time.

According to the outer contour of the support mold 20 , the support mold 20 is designed, the spacing or size of the grille or the hollow is designed, and finally the skin on the side contacting the assembly surface 14 is made to ensure complete contact with the assembly surface 14 .

Finally, it is made according to the design and then assembled.

The combined mold of the present invention can be used repeatedly under the premise of ensuring the tensile strength of the casting mold, complex shapes are easy to obtain, the structure is light in weight, the mold cost is low, and operations such as on-site handling or flipping are easy. At the same time, because the assembling surface 14 of the follower mold 10 is shell-shaped, the utilization rate of the 3DP sand mold printing material is effectively improved, the printing time is reduced, the entire molding production cycle is shortened, and the industrial application of the combined mold is promoted.

Claims (17)

1. A combination mold, characterized in that: including following the type mould and supporting the mould, follow the type mould and include main part, strengthening layer, working face and equipment face, the main part is suppressed or is printed by particulate material and form, and the main part surface sets up the strengthening layer, perhaps strengthening layer infiltration main part surface, and the main part is the working face with the one side of sand mould die cavity contact, and relative another side is the equipment face, supports the mould and installs in main part equipment face one side, and shape and equipment face shape phase-match.

2. A combined mould as claimed in claim 1, in which: the main body is made of 5-2000-mesh particle materials.

3. A combined mould as claimed in claim 1, in which: the strengthening layer is attached to the main body when in a liquid state, the strengthening layer is in a solid state after being solidified, the hardness of the main body attached with the strengthening layer is not lower than 85HD, and the tensile strength is not lower than 15 MPa.

4. A combined mould as claimed in claim 1, in which: the strengthening layer comprises at least one of epoxy resin AB glue, epoxy-polyamide AB glue, phenolic aldehyde-epoxy resin AB glue, phenolic aldehyde resin, urea-formaldehyde resin, melamine-formaldehyde resin, epoxy resin, organic silicon resin, furan resin, unsaturated polyester, acrylic resin, polyimide, polybenzimidazole, phenolic aldehyde-polyvinyl acetal, phenolic aldehyde-polyamide, epoxy-polyamide, vinyl polymer, polyester, polyether, polyamide, polyacrylate, a-cyanoacrylate, polyvinyl acetal, ethylene-vinyl acetate copolymer, phenolic aldehyde-butyronitrile glue, phenolic aldehyde-chloroprene glue, phenolic aldehyde-polyurethane glue, epoxy-butyronitrile glue and epoxy-polysulfide glue.

5. A combined mould according to claim 4, characterised in that: the strengthening layer penetrates into the surface of the body by at least 2 mm.

6. A combined mould as claimed in claim 1, in which: the main body comprises splicing bodies and connecting blocks, and the main body is formed by splicing at least two splicing bodies; the connecting block is simultaneously connected with at least two adjacent splicing bodies, and the at least two splicing bodies are relatively fixed.

7. A combined mould according to claim 6, characterised in that: the splicing bodies further comprise clamping grooves, and the adjacent splicing bodies are respectively provided with convex or concave clamping grooves which are matched with each other, namely the adjacent splicing bodies are spliced and formed in the concave through the convex placement.

8. A combined mould as claimed in claim 1, in which: the main part still includes the strengthening rib, the main part is double-deck or the multilayer that the intermediate layer is the cavity, and is provided with the strengthening rib between the two-layer structure, the strengthening rib both ends are connected with two-layer structure respectively, double-deck or multilayer and strengthening rib integrated into one piece.

9. A combined mould as claimed in claim 1, in which: the supporting mold is made of at least one material of wood, metal and resin.

10. A combination die as claimed in claim 9, wherein: the supporting mold is hollow or in a grid shape.

11. A combination die as claimed in claim 10, wherein: the outer contour of the supporting die is consistent with the outer contour of a three-dimensional shape consisting of at least one cube and/or at least one cuboid.

12. A combination die as claimed in claim 10, wherein: the assembling surface is in complete contact with the supporting die, and the surface of the supporting die in contact with the assembling surface is a flat plane.

13. A combined mould as claimed in claim 1, in which: the assembling surface comprises a mounting structure A, the supporting mold comprises a mounting structure B, the mounting structure A of the assembling surface protrudes out or is sunken, the mounting structure B on the corresponding supporting mold is correspondingly sunken or protrudes, and the assembling surface and the supporting mold are relatively fixed by being placed in the sunken part in a protruding mode.

14. A combined mould as claimed in claim 1, in which: the riveting device is characterized by further comprising a riveting rod, wherein the riveting rod penetrates through the free-form die and the supporting die at the same time, and the free-form die and the supporting die are relatively fixed.

15. A combination die as claimed in claim 14, wherein: the riveting rod comprises a cap body at the upper end and a rod body at the lower part, the cross-sectional area of the cap body is larger than that of the rod body, and the cap body is arranged in the free-form die.

16. A combination die as claimed in claim 14, wherein: the main part still including riveting the type hole, the main part is that the intermediate layer is the bilayer of cavity or multilayer, rivet the type hole setting and be in the cavity of bilayer or multilayer or rivet the type hole and run through the main part, rivet the type pole setting and be in rivet in the type hole.

17. A combined mould as claimed in claim 1, in which: the riveting die is characterized by further comprising a bottom plate, the free-form die and the supporting die are arranged on the bottom plate, the supporting die is fixed on the bottom plate, and the riveting rod penetrates through the free-form die, the supporting die and the bottom plate simultaneously.

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