CN104842535B - Injection molding processing method for forming orthogonal through micro-hole - Google Patents

Abstract

The invention relates to an injection molding processing method for forming orthogonal through micro holes, which belongs to the field of injection molding, and relates to an injection mold processing method and device for forming orthogonal through micro holes. In this method, the side core-pulling movement of the fine-tuning side core-pulling mechanism is used to realize micro-adjustment, and complete the precise alignment and cooperation of the horizontal arc surface and the vertical cylindrical surface. The implementation process of the injection mold processing method includes mold closing, pouring, mold opening, and ejection of the product. The mold device adopted in the method is composed of a fixed mold part, a fine-tuning side core-pulling mechanism, a push tube push rod ejection mechanism and a movable mold part. The invention can form the microfluidic connector with the orthogonal through micro-holes and the micro-positioning through-holes at one time, which reduces the subsequent processing steps, has high molding efficiency, lowers the cost, and reduces energy consumption; it can ensure the orthogonal through-through micro-holes and the micro-positioning through-holes The relative position accuracy between them provides a basic guarantee for the next step of bonding and packaging, and realizes quick replacement of cores.

Description

An injection molding processing method for forming orthogonal through-holes

technical field

The invention belongs to the field of injection molding, and relates to an injection molding processing method for forming orthogonal through tiny holes.

Background technique

Orthogonal through micro-holes with a cross-sectional size of about millimeters, including round holes, square holes, etc. The communicating micropore is one of the key functional units. The use of injection molding to manufacture polymer material micro-devices has the advantages of low cost, high production efficiency, and good device consistency. At present, there are mainly the following methods for fabricating orthogonal through micro-pore structures:

1) The special twist drill for processing intersecting holes invented by Liu Guowei with the publication number CN 202701460 U uses special mechanical cutting tools and adopts manual alignment to manufacture orthogonal intersecting holes, which is not efficient and complicated to operate, and It is easy to scratch the processed microstructure.

2) A general-purpose microfluidic chip interface invented by Zhang Lihua et al. with the publication number CN 104226386 A, adopts multiple parts to assemble and form the interface outside the microdevice, and forms a microfluidic with orthogonal through-holes in the present invention Compared with the connector, multiple adjustments are required to align the infusion tube with the infusion port, adding additional process steps and parts.

Contents of the invention

In order to overcome the defects of the prior art, the present invention invents an injection molding processing method for forming orthogonally penetrating tiny holes, and uses the micro-adjustment function of the fine-tuning side core-pulling mechanism to solve the problem of alignment coupling between the arc surface and the cylindrical surface, forming An effective implementation method for forming orthogonal through micro-holes is presented. With this invention, polymer devices with orthogonally penetrating tiny holes can be injection molded at one time, which has the advantages of high processing efficiency, good device consistency, fewer process steps, and low cost, and avoids the possibility of scratching the processed parts by multiple cutting methods. A matter of good microarchitecture.

The technical solution adopted by the present invention is an injection molding processing method for forming orthogonally penetrating tiny holes, which is characterized in that the method adopts the method of fine-tuning the side core-pulling position of the side core-pulling mechanism in the mold to realize the positioning of the side core-pulling and complete the horizontal arc surface Accurately align and fit with the vertical cylindrical surface, the specific steps of the method are as follows:

1) Assembly of the fixed mold parts: the inclined guide post 25 is installed on the wedge block 3, pressed with the inclined guide post pressure plate 2, the wedge block 3 is installed and fixed on the fixed template 1 with an open groove structure, and the fixed mold parts are completed assembly;

2) Assembly of fine-tuning side core-pulling mechanism:

The side core 6 with the side core-pulling arc surface 6a at the rear end is installed on the side core-pulling fixing plate 8 through the compression spring 7, and the side core-pulling fixing plate 8 is installed on the slider 4 to ensure that the compression spring 7 has a certain distance of installation. Compression amount; at the same time, the square structure at the front end of the side core pulling 6 extends into the square shaped hole 4b of the slider 4, and the free rotation of the side core pulling 6 is constrained by the square shaped hole 4b on the slider 4; the elongation adjustment screw The plug 5 and the position adjustment screw plug 21 are respectively installed in the elongation adjustment threaded hole 4a and the position adjustment threaded hole 4c corresponding to the slider 4 to complete the assembly of the fine-tuning side core-pulling mechanism with a fine-tuning function;

3) Assembly of push tube push rod ejection mechanism:

Push tube 11, two push rods 23, pull rod 24, and four reset rods 20 are installed in the countersunk hole of push tube fixing plate 14, and are pressed and fixed with push tube pressure plate 15; straight core 12 passes through the bottom plate of movable mold 16. The push tube platen 15 extends into the push tube 11, and is installed in the countersunk hole of the movable mold bottom plate (16). In the through hole of the plate 14, be installed in the countersunk hole of the movable mold bottom plate (16), press the through hole push rod 22 and the straight core 12 on the movable mold bottom plate 16 with the straight core pressing plate 17; Back-moving spring 19 is installed to form a spring reset mechanism first;

4) Fine-tuning the assembly of side core-pulling mechanism, push tube push rod ejection mechanism and moving mold parts

There are movable template 9, support plate 10 and spacer 13 in the movable mold parts; push tube push rod ejection mechanism is installed on the right side of movable template 9 through spacer 13 and support plate 10; Tighten, be installed on the movable formwork 9 that has guide chute with bolt, complete the assembly of injection mold;

5) Alignment and cooperation between side core pulling and straight core:

Z-direction adjustment: rotate the position adjustment screw plug 21 to adjust the position of the side core-pulling fixing plate 8, control the fine-tuning amount of the side core-pulling 6 in the Z-direction, and realize the adjustment of the matching position of the side core-pulling 6 and the straight core 12;

Y direction adjustment: Rotate the elongation adjustment screw plug 5, adjust the installation compression of the compression spring 7, adjust the compensation amount of the side core-pulling arc surface 6a to the straight core cylindrical surface 12a in the Y direction, and ensure the manual mold clamping. , realizing the alignment coupling between the side core pulling 6 and the straight core 12;

6) Mold closing limit and mold opening limit

The "⊥" groove formed by the guide rail platen 27 and the movable template 9 is used for movement restriction, and the clamping block 3 is used to complete the mold clamping limit, and the ball head screw 28 cooperates with the limit hole 4e on the slider 4 to complete the mold opening limit. bit;

7) The implementation process of injection molding tiny holes includes mold closing, pouring, mold opening, and ejection of products

After completing step 5, the injection mold is installed on the injection molding machine, which is driven by the injection molding machine to close the mold and perform pouring. The injection molding machine injects the molten polymer material into the closed mold cavity through the nozzle and the pouring system of the mold , after maintaining the pressure and cooling, the mold is opened; the thimble system pushes the push tube platen 15 to move, thereby driving the pull rod 24, push rod 23, push tube 11 and reset rod 20 on the push tube fixing plate 14 to move; the pull rod 24. The push rod 23 and the push tube 11 complete the ejection of the product; the reset spring 19 on the reset rod 20 relies on elastic force to restore the ejector mechanism to the initial position.

An injection molding processing method for forming orthogonal through tiny holes, characterized in that the mold device used in the method is composed of a fixed mold part, a fine-tuning side core-pulling mechanism, a push tube push rod ejection mechanism and a movable mold part;

In the fixed mold part: the inclined guide post 25 is installed on the wedge block 3, pressed by the inclined guide post pressing plate 2, and the wedge block 3 is fixedly installed in the opening groove below the right side of the fixed template 1;

In the fine-tuning side core-pulling mechanism, the slider 4 is processed with an elongation-adjusting threaded hole 4a, a square shaped hole 4b, a position-adjusting threaded hole 4c, an inclined hole 4d, and a limit hole 4e; the front end of the side core-pulling 6 It is a square structure, the rear part is a thin shaft, and a side core-pulling arc surface 6a is processed at the rear end of the thin shaft; the side core-pulling 6 is installed on the side core-pulling fixing plate 8 through the compression spring 7, and the side core-pulling fixing plate 8 is installed on the On the slider 4, ensure that the compression spring 7 has a certain distance of installation compression; the square structure at the front end of the side core puller 6 is inserted into the square shaped hole 4b of the slider 4, and the side core puller is constrained by the square shaped hole 4b on the slider 4 6; the elongation adjustment screw plug 5 and the position adjustment screw plug 21 are respectively installed in the elongation adjustment threaded hole 4a and the position adjustment threaded hole 4c corresponding to the slider 4;

In the push tube push rod ejection mechanism: the push tube 11, the two push rods 23, the pull rod 24, and the four reset rods 20 are respectively installed in the corresponding countersunk holes of the push tube fixing plate 14, The tube pressing plate 15 is compressed and fixed; the straight core cylindrical surface 12a of the straight core 12 passes through the movable mold base plate 16, and the push tube pressing plate 15 extends into the push tube 11, and the two through-hole push rods 22 pass through the movable mold base plate 16, The push tube pressing plate 15 stretches into the through hole of the pushing tube fixing plate 14, and the through hole push rod 22 and the straight core 12 are pressed tightly on the movable mold bottom plate 16 with the straight core pressing plate 17; the reset spring 19 is installed on the reset rod 20 Constitute a spring return mechanism;

The moving mold parts include a moving template 9, a support plate 10 and a cushion block 13; the push tube push rod ejection mechanism is installed on the right side of the movable template 9 through the cushion block 13 and the support plate 10; Press plate 27 compresses, and is installed on the movable formwork 9 that has guide chute by bolt.

An injection molding processing method for forming orthogonal through tiny holes, characterized in that the straight core 12 in the push tube push rod ejection mechanism described in the mold device used to form the horizontal hole in the X direction is not fixed. It is movable, and cooperates with the above-mentioned fine-tuning side core-pulling mechanism to form orthogonal through micro-holes, which can be changed into different orthogonal through-micro-hole structures such as "L" shape and "T" shape.

The beneficial effects of the present invention are: 1) It is possible to form a microfluidic connector with orthogonal through-holes and micro-positioning through-holes at one time, reducing subsequent processing steps, high molding efficiency, lower costs, and reduced energy consumption; 2) It can ensure positive The relative position accuracy between the through-through micro-hole and the micro-positioning through-hole provides a basic guarantee for the next step of bonding and packaging; 3) It can realize quick replacement of the core.

Description of drawings

Fig. 1 Structural diagram of injection mold clamping state; Fig. 2 Structural diagram of fine-tuning side core-pulling mechanism; Fig. 3 Axonometric diagram of slider; Fig. 4 Axonometric diagram of push tube and push rod ejection mechanism; 6 Axonometric drawing of moving model installation.

In the figure: Cartesian coordinate system is adopted, the horizontal direction is the X direction, the vertical direction is the Y direction, and the direction outside the vertical paper is the Z direction. Among them, 1. fixed template, 2. inclined guide post pressure plate, 3. wedge block, 4. slider, 4a, elongation adjustment threaded hole, 4b, square special-shaped hole, 4c, position adjustment threaded hole, 4d, oblique Hole, 4e, limit hole, 5, elongation adjustment screw plug, 6, side core pulling, 6a, side core pulling arc surface, 7, compression spring, 8, side core pulling fixing plate, 9, movable template, 10 , support plate, 11, push tube, 12, straight core, 12a straight core cylindrical surface, 13, spacer, 14, push tube fixing plate, 15, push tube pressure plate, 16, movable mold bottom plate, 17, straight Core pressing plate, 18, top rod, 19, return spring, 20, reset rod; 21, position adjustment screw plug, 22, through-hole push rod, 23, push rod, 24, material pulling rod, 25, inclined guide post, 26 , guide post, 27, guide rail pressing plate.

Figure 7 Microfluidic connector product map.

detailed description

The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and technical solutions. Taking the use of a micro-injection mold device to make a microfluidic connector with orthogonal through micro-holes as an example, the specific implementation steps of the present invention are as follows:

1. Assembly of fixed mold components: the inclined guide post 25 is installed on the wedge block 3, pressed with the inclined guide post pressure plate 2, and the wedge block 3 is installed and fixed on the fixed template 1 with an open groove structure to complete the fixed mold parts assembly, as shown in Figure 4.

2. Assembly of moving mold parts:

(1) Assembly of the fine-tuning side core-pulling mechanism: the side core-pulling 6 with the side core-pulling arc surface 6a at the rear end is installed on the side core-pulling fixing plate 8 through the compression spring 7, and the side core-pulling fixing plate 8 is installed on the slider 4, ensure that the compression spring 7 has a certain distance of installation compression. At the same time, the square structure at the front end of the side core 6 extends into the square shaped hole 4 b of the slider 4 , and the free rotation of the side core 6 is constrained by the square shaped hole 4 b on the slider 4 . The elongation adjustment screw plug 5 and the position adjustment screw plug 21 are respectively installed in the elongation adjustment threaded hole 4a and the position adjustment threaded hole 4c corresponding to the slider 4 to complete the assembly of the fine-tuning side core-pulling mechanism with a fine-tuning function. as shown in picture 2.

(2), assembly of push tube push rod ejection mechanism: push tube 11, two push rods 23, puller rod 24, four reset rods 20 are installed in the countersunk hole of push tube fixing plate 14, push tube The pressure plate 15 is pressed and fixed; the straight core 12 extends into the push tube 11 through the movable mold bottom plate 16 and the push tube pressure plate 15, and the through-hole push rod 22 extends into the push tube fixing plate through the movable mold bottom plate 16 and the push tube pressure plate 15 In 14 through holes, through hole push rod 22, straight core 12 are compressed on the movable die base plate 16 with straight core pressing plate 17. Back-moving spring 19 is installed on the back-moving lever 20 to form a spring first-returning mechanism, as shown in Figure 3 .

(3) The integration of the fine-tuning side core-pulling mechanism and the pushing-out mechanism of the push tube and push rod:

There are movable template 9, support plate 10 and spacer 13 in the movable mold parts; the ejector mechanism of push tube and push rod is installed on the right side of movable template 9 through spacer 13 and support plate 10; On the movable template 9 of groove, compress with guide rail pressing plate 27, be installed on the movable template 9 that has guide chute with bolt, finish the assembling of injection mold, as shown in Figure 5.

3. Alignment coupling between side core pulling and straight core:

(1) Z-direction adjustment: Rotate the position adjustment screw plug 21 to adjust the position of the side core-pulling fixing plate 8, control the fine-tuning of the side core-pulling 6 in the Z-direction, and realize the matching position of the side core-pulling 6 and the straight core 12. Adjustment.

(2) Y direction adjustment: Rotate the elongation adjustment screw plug 5, adjust the installation compression of the compression spring 7, adjust the compensation amount of the side core-pulling arc surface 6a to the straight core cylindrical surface 12a in the Y direction, and ensure that the manual closing In the case of a mold, the alignment coupling between the side core 6 and the straight core 12 is realized.

Utilize above-mentioned mold device to inject and mold the implementation technological process of tiny hole as follows:

Mold clamping: The inclined guide column 25 of the fixed mold part extends into the inclined hole 4d of the slider 4 of the movable mold part to drive the slider 4 to complete the mold clamping feed, so as to realize the alignment between the side core pulling arc surface 6a and the straight core cylindrical surface 12a alignment coupling.

Pouring: The injection molding machine injects the molten polymer material into the closed mold cavity through the nozzle and the gating system of the mold, and opens the mold after pressure maintaining and cooling.

Mold opening: under the action of the inclined guide post 25, the mold opening reset of the slider 4 is realized, and the core-pulling movement is completed. When the slanted guide post 25 leaves the slanted hole 4d of the slider 4, the reset position of the slider 4 is restricted and fixed by the ball head screw.

The product is ejected, and the thimble system pushes the push tube pressing plate 15 to move, thereby driving the pulling rod 24, the push rod 23, the push tube 11 and the reset rod 20 on the push tube fixing plate 14 to move. The pulling rod 24, the push rod 23 and the push tube 11 complete the ejection of the product; the reset spring 19 on the reset rod 20 relies on elastic force to restore the ejector mechanism to the initial position.

The microfluidic connector with orthogonally penetrating micro-holes made by using this mold device is shown in Figure 7. It has a micro-hole structure orthogonally penetrating in the X direction and the Y direction. effect. The micro-through hole on the microfluidic connector has a positioning function, which can ensure the alignment of the X-direction channel with the structure of the microfluidic chip.

The injection-molded microfluidic connector of this invention can ensure the relative position accuracy between the orthogonal through-holes and the micro-positioning through-holes, provide a basic guarantee for the next step of bonding and packaging, reduce subsequent processing procedures, and have high molding efficiency. cut costs.

Claims (3)

1. a kind of injection molding method of the orthogonal insertion micro hole of molding is it is characterised in that the method is using micro- in adjustment mould Side core-pulling positioning is realized in the side core-pulling position adjusting side core-pulling mechanism, completes horizontal cambered surface and the accurate aligned fit in vertical cylinder face, The specifically comprising the following steps that of method

1) assembling of cover half part: Angle Pin (25) is arranged on wedge block (3), with Angle Pin pressing plate (2) compression, wedge block (3) it is fixed on the solid plate (1) with opening slot structure, complete the assembling of cover half part；

2) assembling of fine setting side core-pulling mechanism:

The side core-pulling (6) that rear end has side core-pulling cambered surface (6a) is arranged in side core-pulling fixed plate (8) through compression spring (7), Side core-pulling fixed plate (8) is arranged on slide block (4) above it is ensured that compression spring (7) has the installation decrement of certain distance；Side simultaneously The square structure that core pulling (6) front end has extend in the square profiled holes (4b) of slide block (4), using square on slide block (4) Profiled holes (4b) constrain the freely rotatable of side core-pulling (6)；Elongation adjustment plug screw (5) is respectively mounted with position adjustment plug screw (21) In slide block (4) corresponding elongation adjustment screwed hole (4a) with position adjustment screwed hole (4c), complete to act on micro-adjustment Fine setting side core-pulling mechanism assembling；

3) assembling of ejector sleeve push rod ejecting mechanism:

Ejector sleeve (11), two push rods (23), sprue puller (24), four release links (20) are arranged on the countersunk head of ejector sleeve fixed plate (14) In the hole, is fixed with ejector sleeve pressing plate (15)；Straight core (12) passes through moving clamping plate (16), ejector sleeve pressing plate (15) extend into ejector sleeve (11) in, it is arranged on the countersunk head in the hole of moving clamping plate (16), two through hole push rods (22) pass through moving clamping plate (16), ejector sleeve pressing plate (15) stretch in ejector sleeve fixed plate (14) through hole, be arranged on the countersunk head in the hole of moving clamping plate (16), with straight core pressing plate (17) Through hole push rod (22), straight core (12) are pressed on moving clamping plate (16)；Release link (20) is upper to install back-moving spring (19), composition Spring elder generation resetting-mechanism；

4) finely tune assembling of side core-pulling mechanism, ejector sleeve push rod ejecting mechanism and dynamic model part

There are moving platen (9), gripper shoe (10) and cushion block (13) in dynamic model part；Ejector sleeve push rod ejecting mechanism pass through cushion block (13) and Gripper shoe (10) is arranged on the right side of moving platen (9)；Fine setting side core-pulling mechanism is compressed with guide rail clip (27), is arranged on tool with bolt Have on the moving platen (9) of guide runner, complete the assembling of injection mold；

5) side core-pulling and straight core aligned fit:

Z direction adjusts: position of rotation adjustment plug screw (21), adjusts the position of side core-pulling fixed plate (8), controls side core-pulling (6) in z The amount trimmed in direction, realizes the adjustment of side core-pulling (6) and the cooperation position of straight core (12)；

Y direction adjusts: rotatable elongate amount adjustment plug screw (5), adjusts the installation decrement of compression spring (7), adjusts side core-pulling arc Face (6a) in y direction to the compensation dosage of the straight core face of cylinder (12a) it is ensured that in the case of manual matched moulds, realize side core-pulling (6) with The be aligned coupling of straight core (12)；

6) matched moulds is spacing and die sinking is spacing

Carry out kinematic constraint using " ⊥ " type groove that guide rail clip (27) and moving platen (9) are formed, and complete to close by wedge block (3) Mould is spacing, and spacing hole (4e) cooperation on bulb jackscrew and slide block (4) completes to mold spacing；

7) the implementing process process of injection mo(u)lding micro hole has matched moulds, cast, die sinking, ejection product

After completing the 5th step, injection mold is arranged on injection machine, is driven by injection machine and realizes matched moulds, is poured into a mould, and injection machine will The running gate system injection that the polymeric material of molten state passes through nozzle and mould enters in the mold cavity having closed, through pressurize, Cooling, is molded；Thimble systems force ejector sleeve pressing plate (15) moves, thus driving the sprue puller in ejector sleeve fixed plate (14) (24), push rod (23), ejector sleeve (11) and release link (20) are moved；Sprue puller (24), push rod (23) and ejector sleeve (11) complete product Ejection；Back-moving spring (19) in release link (20) relies on elastic force to make ejecting mechanism return to position.

2. as claimed in claim 1 a kind of injection molding method of the orthogonal insertion micro hole of molding it is characterised in that the method Using die device be made up of cover half part, fine setting side core-pulling mechanism, ejector sleeve push rod ejecting mechanism and dynamic model part；

In described cover half part: Angle Pin (25) is arranged on wedge block (3), with Angle Pin pressing plate (2) compression, wedge block (3) it is fixedly mounted in the open slot below solid plate (1) right flank；

In described fine setting side core-pulling mechanism, slide block (4) is machined with elongation adjustment screwed hole (4a), square profiled holes (4b), position adjustment screwed hole (4c), inclined hole (4d) and spacing hole (4e)；Side core-pulling (6) front end is square structure, and rear portion is divided into Thin axle, is machined with side core-pulling cambered surface (6a) in thin shaft rear end；Side core-pulling (6) is arranged on side core-pulling through compression spring (7) and fixes On plate (8), side core-pulling fixed plate (8) is arranged on slide block (4) above it is ensured that compression spring (7) has the installation compression of certain distance Amount；Side core-pulling (6) front end square structure is inserted in the square profiled holes (4b) of slide block (4), using square different on slide block (4) Type hole (4b) constrains the freely rotatable of side core-pulling (6)；Elongation adjustment plug screw (5) is separately mounted to position adjustment plug screw (21) In slide block (4) corresponding elongation adjustment screwed hole (4a) and position adjustment screwed hole (4c)；

In described ejector sleeve push rod ejecting mechanism: ejector sleeve (11), two push rods (23), sprue puller (24), four release links (20) it is separately mounted to the corresponding countersunk head in the hole of ejector sleeve fixed plate (14), be fixed with ejector sleeve pressing plate (15)；Straight core (12) The straight core face of cylinder (12a) pass through moving clamping plate (16), ejector sleeve pressing plate (15) to extend in ejector sleeve (11), two through hole push rods (22) pass through moving clamping plate (16), ejector sleeve pressing plate (15) extend in ejector sleeve fixed plate (14) through hole, with straight core pressing plate (17) Through hole push rod (22), straight core (12) are pressed on moving clamping plate (16)；Release link (20) is upper to install back-moving spring (19) structure Become spring return mechanism；

There are moving platen (9), gripper shoe (10) and cushion block (13) in described dynamic model part；Ejector sleeve push rod ejecting mechanism passes through cushion block (13) it is arranged on the right side of moving platen (9) with gripper shoe (10)；Fine setting side core-pulling mechanism is compressed with guide rail clip (27), by bolt It is arranged on the moving platen (9) with guide runner.

3. as claimed in claim 1 or 2 a kind of injection molding method of the orthogonal insertion micro hole of molding it is characterised in that should In the die device that method adopts, the straight core (12) in ejector sleeve push rod ejecting mechanism is fixed, with above-mentioned fine setting side Core-pulling mechanism matches synthesis type orthogonal insertion micro hole, and changing its length, to become the orthogonal insertion different with " t " type of " l " type small Pore structure.