CN114770938B

CN114770938B - Combined die device based on 3D printing

Info

Publication number: CN114770938B
Application number: CN202210428905.3A
Authority: CN
Inventors: 杨灿; 阳宝桦; 李春波; 舒阳; 尹晓红; 李尚�
Original assignee: Shenzhen Technology University
Current assignee: Shenzhen Technology University
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2023-12-26
Anticipated expiration: 2042-04-22
Also published as: WO2023201796A1; CN114770938A; DE102023110110A1

Abstract

The invention belongs to the technical field of mold core manufacturing, and provides a combined mold device which comprises a mold core assembly and a machining assembly, wherein the mold core assembly is manufactured through a 3D printing technology, the mold core assembly comprises a mold core body and an ear plate arranged on the outer side of the mold core body, a tangent plane is arranged between the upper surface and the bottom surface of the ear plate, the included angle between the tangent plane and the upper surface is theta, and the theta is more than or equal to 45 degrees and less than 90 degrees. The beneficial effects of the invention are as follows: the dimensional error generated when the mold core component and the substrate in the device are separated does not influence the assembly precision of the mold device, and the device has the characteristics of convenience in disassembly and strong universality.

Description

Combined die device based on 3D printing

Technical Field

The invention belongs to the technical field of mold manufacturing, and particularly relates to a combined mold device based on 3D printing.

Background

Along with the improvement of the living standard of people, individuation and diversification gradually become the main stream demands of consumers for purchasing commodities. The appearance of the consumption trend promotes each industry to make corresponding adjustment, and the injection molding industry also does so: the conventional injection molding has a cost advantage in terms of manufacturing a precision plastic product having a light weight and a complicated structure because mass production can be realized. However, the parts of the traditional injection molding die are manufactured by a machining mode, so that short-period product trial production is difficult to realize, individuation and customization capabilities are lacking, and new market trends are difficult to meet. Fortunately, the rapid development of 3D printing technology enables the injection molding industry to revive, enables free design and manufacture of the mold to be possible, and creates technical conditions for personalized customization of products. In 3D printing technology processes, selective Laser Melting (SLM) capable of manufacturing metal parts having a complex shape and good mechanical properties has been widely used for mold manufacturing. In fact, if the whole die is manufactured by completely adopting the SLM technology, the original advantage of injection molding is lost due to the consideration of the molding cost of the SLM technology. Therefore, to exert the advantage of low cost of injection molding and make up for the defect of personalized customization, the mold manufacturing can be realized by adopting the machining and SLM combination technology, namely, the mold core manufactured by the SLM technology and the mold component manufactured by the machining mode can be assembled to construct a complete mold. However, the integration of both is not easy, mainly for the following reasons: on the one hand, the precision requirement of the injection mold is high, so that the mold core is required to have enough precision to ensure accurate assembly; on the other hand, since the SLM technology is realized based on melting and solidification of metal powder on a substrate, it means that the printed metal mold core is required to be subjected to a series of post-treatment processes to be assembled in an injection mold. In practical application, assembly errors mainly originate from the separation process of the mold core and the substrate (adopting processes such as electrochemical corrosion and wire cutting), so that how to realize accurate separation of the 3D printing metal mold core and the substrate becomes a key problem. The traditional method guarantees the assembly precision by reserving machining allowance and performing post-treatment, and the complicated post-treatment process increases the manufacturing time of the mold core and the workload of operators, so that the machining cost is greatly improved, the advantage of process integration is weakened to a certain extent, and meanwhile, the mass and personalized customization of products is not facilitated. Therefore, development of a new process method and equipment for conveniently realizing rapid and accurate mold assembly is needed.

Disclosure of Invention

The invention aims to provide a combined die device based on a 3D printing technology, so as to solve the problems in the background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a composite mold based on 3D prints, its includes mold core assembly and machining subassembly, wherein the mold core assembly is through 3D printing technology preparation, and the mold core assembly includes the mold core body, and set up the otic placode in the mold core body outside, the otic placode is 2, and the bottom surface of every otic placode and the bottom surface parallel and level of mold core body, and the otic placode highly be less than the height of mold core body, there is the tangent plane of slope between the upper surface and the bottom surface of otic placode, the tangent plane with the contained angle of otic placode upper surface is θ, wherein 45 θ is less than 90 °.

Further, the core assembly also includes a support comprising a horizontal body and a wedge-shaped protrusion comprising an inclined inner side and a vertical face forming an angle β, and β+θ=90°.

Further, each of the ear plates corresponds to one of the supporting members.

Further, the included angle θ is: θ is more than or equal to 70 degrees and less than 85 degrees.

Further, the mold core body is a cylinder.

Further, the lug plate section is in a sector ring-shaped horizontal section after being attached to the inner side face of the wedge-shaped bulge.

Further, a cooling water channel is arranged on the lug plate, the cooling water channel penetrates through the mold core assembly, and the cooling water channel of the mold core assembly is communicated with the cooling water channel of the machining assembly.

Further, the machining assembly comprises an upper template, a middle template and a lower template, and a cooling water channel is arranged in the upper template.

Further, the mold core assembly is accommodated in the upper-layer mold plate, and a positioning hole is formed in the middle-layer mold plate and used for positioning the supporting piece.

Further, the core body is provided with a gate made by 3D printing.

The technical scheme provided by the invention has the beneficial effects that: the wedge-shaped bulge of the supporting piece acts on the lug plate to jack up the mold core assembly, the upper surface of the lug plate is a matching surface, and the lower surface of the lug plate is suspended, so that the assembly precision of the combined mold device is not influenced by errors generated by the separation of the mold core from the base plate; the 3D printing mold core assembly and the machining assembly can be accurately assembled through the support of the wedge-shaped structure. The combined die device provided by the invention adopts a modularized design, can be assembled into any required injection die, and has universality; the mold core component of the combined mold device adopts a 3D printing technology, and is suitable for individuation and batch customization occasions of precise plastic products. In addition, the device has also realized traditional mold processing cooling water course and 3D printing mold core cooling water course's intercommunication, makes 3D printing mold core have better cooling effect when moulding plastics, improves the quality of injection molding product.

Drawings

For a clearer description of embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained from these drawings by those skilled in the art without inventive effort.

FIG. 1 is an exploded view of the assembly of the core assembly with the machining assembly of the present invention;

FIG. 2 is a block diagram of a die core assembly of the present invention;

FIG. 3 is a schematic view of the structure of the cooperation of the die core assembly and the support member in the present invention;

FIG. 4 is a schematic diagram of a coolant flow path in accordance with the present invention;

FIG. 5 is a block diagram of a mold core assembly of the present invention assembled with a machining assembly;

FIG. 6 is a diagram of a middle template structure of the present invention;

FIG. 7 is a block diagram of a support member of the present invention; and

fig. 8A and 8B are an assembly view of the split mold device of the present application and an exploded view thereof, respectively.

Reference numerals: 1-a mold core assembly; 11-a mould core body; 111-a mold cavity; 12-ear plate; 121-cutting; 2-machining the assembly; 21-upper template; 211-a mold core hole; 212-a fan annular groove; 213-gate; 214-a flow channel; 215-a first vent; 216-a second vent; 217-liquid inlet; 218-a liquid outlet; 22-middle layer template; 221-positioning holes; 23-lower template; 24-support; 241-inner side; 242-horizontal body; 25-bolt member sets; 26-locating pin group; 27-a thimble group; 28-set screws.

Detailed Description

In order to make the objects, technical solutions and advantageous effects of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to fall within the scope of the present invention.

The invention provides a combined die device based on 3D printing, which comprises a die core assembly 1 and a machining assembly 2 manufactured by a 3D printing technology, wherein the die core assembly 1 is embedded in the machining assembly 2, and the positioning precision of the die core assembly in the device can meet the requirement of injection die assembly, so that the injection die manufacturing oriented to personalized and mass precise plastic product production is realized.

In a specific embodiment, referring to fig. 1 and 2, the mold core assembly 1 includes two cylindrical mold core bodies 11, the ear plates 12 located at both sides of the mold core bodies 11, and the supporting members 24 located below the ear plates 12, the two mold core bodies 11 are respectively installed in mold core holes 211 (see fig. 5) of the machining assembly 2, the upper surfaces of the mold core bodies 11 are provided with mold cavities 111, and the shapes of the mold cavities 111 are determined according to actual needs by the shapes of products to be molded, so that the structures of the left and right mold core bodies 11 may be identical or different. The different mold cavity configurations of fig. 1 and 2 allow for the simultaneous production of two products.

In other embodiments, the number of core bodies 11 may be 1, or more than 2, depending on the actual need.

In the present embodiment, referring to fig. 1, 2 and 8A, the left side core body 11 is different in structure from the right side core body 11. Specifically, the left side is different from the cavity 111 (top surface groove portion) of the top surface of the right side core body 11. In other embodiments, the mold cavity 111 may be a T-shaped recess, or may be a recess of other shapes.

In fig. 1, a mold cavity 111 on a left side mold core body 11 is a cylindrical counter bore at the center, three air discharge grooves extending outwards to the boundary of the mold core body 11 are arranged at corresponding positions along the circumference of the cylindrical counter bore, and a gate 213 connecting the cylindrical counter bore and a machining assembly 2, wherein a first air discharge groove is positioned at the opposite side of the gate 213, and the other two air discharge grooves pass through the center of the cylindrical counter bore in a collinear manner and are perpendicular to the first air discharge groove. The depth of the exhaust groove is smaller than that of the cylindrical counter bore, the depth of the cylindrical counter bore or the exhaust groove is smaller than the height of the die core body 11, and the width of the exhaust groove is smaller than the diameter of the cylindrical counter bore. It should be understood that this configuration is only one embodiment of a core recess. It should be noted that the gate 213 is provided on the core assembly 1 prepared by printing, i.e. the gate is manufactured by 3D printing, so that the arrangement allows on the one hand to adjust the geometrical parameters of the gate according to different products, and on the other hand to obtain an optimal gate for the same product.

The right side core body 11 in fig. 1 is similar to the left side except that the cavity 111 of the right side core body 11 is a rectangular countersink, and the number of vent grooves is 5.

The structure and positional relationship of the ear plates 12 are specifically described below, referring to fig. 2 and 3, in this embodiment, a pair of ear plates 12 are disposed at corresponding positions on the periphery of the mold core body 11, the connecting line of the two passes through the center of the horizontal section of the mold core body 11, the thickness of the ear plates 12 is smaller than the height of the mold core body 11, and the bottom surfaces of the ear plates 12 are flush with the bottom surface of the mold core body 11. Referring to fig. 2, the upper surface of the ear plate 12 is parallel to the upper surface of the upper-layer die plate 21, and the cross-sectional area of the end combined with the die core body 11 is smaller than the cross-sectional area of the end far from the die core body 11, and the upper surface is shaped like a sector ring (a shape obtained by subtracting a sector with the same central angle but a smaller radius from the sector), and the lower surface of the ear plate 12 is smaller than the upper surface. Referring to FIG. 3, there is a tangential plane 121 (see FIG. 2) between the upper and lower surfaces, where the tangential plane 121 is at an angle θ of 45 θ+.θ < 90 °, and where the greater the angle θ, the greater the accuracy of the formation of the tangential plane of the ear plate 12 with the sloped inner side of the support member 24, which can be selected by one skilled in the art in combination with other influencing factors, and where, on the other hand, an excessive angle θ can affect the processing of the support member. Preferably, the included angle θ ranges from 70 ° to 85 °, most preferably 75 °. Referring to fig. 3 and 7, the combined mold device further includes a support 24, the support 24 includes a horizontal body 242 and a wedge-shaped protrusion, the wedge-shaped protrusion has a triangular cross section, and the wedge-shaped protrusion includes an inclined inner side surface 241 and a vertical surface, the inner side surface 241 and the vertical surface form an angle β, and β+θ=90°. In particular use, the support 24 is disposed below the ear plate 12 of the mold core body 11, and the wedge-shaped raised inner surface 241 cooperates with the above-mentioned tangential surface 121 of the ear plate 12 to form a complete fanned ring (i.e., each horizontal section is fanned ring shaped). At this time, the two supporting pieces 24 respectively abut against the corresponding ear plates 12 to accurately position the mold core.

In this embodiment, the mold core body 11 is further provided with a cooling water channel (flowing into the mold core body 11 from one side of the ear plate 12 and then flowing out from the other side of the ear plate 12), both side cooling water channel ports are engaged with the cooling water channel of the machining assembly 2, and in order to ensure tightness, a sealing gasket is provided at the junction of the cooling water channel of the mold core body 11 and the cooling water channel of the machining assembly 2. Referring to fig. 4 and 5, the cooling fluid flows in from the inlet 217 of the machining assembly 2, flows into the mold core assembly 1 through one side ear plate 12, flows out from the other side ear plate 12, enters the cooling water channel of the machining assembly 2, and finally flows out from the outlet 218. In one embodiment, the diameter of the cooling water channel on the mold core is 3mm and the diameter of the cooling water channel on the machining assembly is 4mm.

Specifically, the machining assembly 2 includes an upper template 21, a middle template 22, and a lower template 23.

Specifically, referring to fig. 8A and 8B, the core assembly 1 is fitted on the upper template 21; the middle layer template 22 is sleeved with a supporting piece 24 for the mold core assembly 1 to lean against and be positioned, and the supporting piece 24 is accommodated in the positioning hole 221; the lower template 23 is provided with a set of bolt through holes, a set of positioning pin holes and a set of threaded holes. Specifically, the bolt member group 25 is screwed into the screw hole in the upper die plate 21 from the bolt through hole of the lower die plate 23 through the bolt through hole of the middle die plate 22 to achieve firm connection of the processing assembly 2. The positioning pin group 26 penetrates through the middle layer template 22 and is respectively embedded into the positioning pin holes of the upper layer template 21 and the lower layer template 23 upwards and downwards so as to ensure the accurate positioning of the machining assembly 2. The adjusting screw group 28 is screwed into a threaded hole in the lower template 23 to support the support piece 24 placed in the positioning hole 221, and the assembly tightness is adjusted by screwing in or screwing out to ensure the assembly positioning precision of the mold core assembly 1.

Specifically, referring to fig. 5, fig. 5 is a structural diagram of a single mold core assembly 1 after being assembled into a machining assembly 2, the upper mold plate 21 is a combination of two rectangular solids, and the cross section of the upper mold plate 21 is in a shape of a "convex" shape. Two mold core holes 211 for sleeving the mold core body 11 are symmetrically formed in the upper-layer mold plate 21, a fan-shaped annular groove 212 for accommodating the lug plate 12 is formed in the upper-layer mold plate 21, and the fan-shaped annular groove 212 extends to the opening of the lower end of the mold core hole 211.

In the machining assembly 2, an open flow passage 214 (i.e., a rectangular groove portion) is machined between the one side core hole 211 and the other side core hole 211. Referring to fig. 5, a gate 213 (i.e., a trapezoidal groove portion) is connected to the end of the runner 214. The depth of the runner 214 is smaller than the height of the mold core body 111, the depth of the gate 213 is smaller than the depth of the runner 214, and the gate 213 gradually transits between the gate 214 and the runner. In particular, the gates 213 are provided on the 3D-printed core assembly 1, i.e. the gates are manufactured by 3D printing, such that the arrangement allows on the one hand to adjust the geometric parameters of the gates according to different products and on the other hand to obtain the optimal gates of the same product.

Specifically, referring to fig. 5, a plurality of air vent grooves 215 and 216 are further formed in the upper template 21, and the plurality of air vent grooves 215 and 216 are arranged in parallel or perpendicular to the surface of the upper template 21. The surface of the upper template 21 is provided with first air discharge grooves 215 which are equidistantly distributed in the direction parallel to the long side, and 3 first air discharge grooves 215 are shown in fig. 5. In the direction parallel to the short side, the upper layer template 21 is provided with second air discharge grooves 216 distributed equidistantly, and the second air discharge grooves 216 pass through the mold core holes 211 and the runners 214 from one side of the upper layer template 21 to the other side. Preferably, the number of the second air discharge grooves 216 is 4. As shown in fig. 5, when the core assembly 1 is loaded into the machining assembly 2, the first vent slot 215 and the second vent slot 216 interface with the vent slots on the core assembly 1.

In a specific embodiment, referring to fig. 6, 8A and 8B, the bottom surface of the upper template 21 is attached to the top surface of the middle template 22, and positioning holes 221 for accommodating the horizontal body 242 of the supporting member 24 are formed in the middle template 22, so that four circular holes are formed around each positioning hole 221 for facilitating the processing. Specifically, the body of the positioning hole corresponds to the horizontal body 242 of the support 24, and the horizontal body 242 is fixed in the positioning hole 221 so as not to be rotatable. In use, the top of the adjusting screw set 28 abuts against the bottom of the supporting piece 24, and the adjusting screw set 28 is screwed in or screwed out to adjust the assembly tightness of the supporting piece 24 and the ear plate 12 so as to ensure the assembly positioning precision of the mold core assembly 1.

In one embodiment, the shape of the product corresponding to the mold core assembly 1 can be flexibly adjusted according to the actual needs of the user, and can be printed by adopting mold steel or other alloys; the machined component 2, because of its versatility, can be manufactured using conventional machining methods. The combined design improves the flexibility of product design and realizes mass personalized customization.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any modification, equivalent variation and variation made by those skilled in the art to which the present invention pertains will still fall within the scope of the present invention.

Claims

1. The combined die device based on 3D printing is characterized by comprising a die core assembly and a machining assembly, wherein the die core assembly is manufactured by a 3D printing technology, the die core assembly comprises a die core body and 2 ear plates arranged on the outer side of the die core body, the bottom surface of each ear plate is flush with the bottom surface of the die core body, the height of each ear plate is smaller than that of the die core body, an inclined tangent plane is arranged between the upper surface and the bottom surface of each ear plate, and the included angle between the tangent plane and the upper surface of each ear plate is theta, wherein theta is more than or equal to 45 degrees and less than 90 degrees;

the mold core assembly further comprises a support piece, wherein the support piece comprises a horizontal body and a wedge-shaped bulge, the wedge-shaped bulge comprises an inclined inner side surface and a vertical surface, an included angle formed by the inner side surface and the vertical surface is beta, and beta+θ=90°; each ear plate corresponds to one of the supporting pieces; the mold core body is a cylinder; the lug plate is provided with a sector-shaped horizontal section after being attached to the wedge-shaped bulge; the machining assembly comprises an upper template, a middle template and a lower template; the mold core assembly is accommodated in the upper-layer mold plate, and the middle-layer mold plate is provided with positioning holes for positioning the supporting body.

2. The modular mold device according to claim 1, characterized in that the included angle θ is preferably of the order: θ is more than or equal to 70 degrees and less than 85 degrees.

3. The modular mold apparatus of claim 1 wherein the core assembly is provided with cooling water passages extending therethrough, the cooling water passages of the core assembly communicating with the cooling water passages of the machining assembly.

4. The modular mold apparatus according to claim 1, wherein the core body is provided with a gate, the gate being made of 3D printing.