CN101733300B

CN101733300B - Self-positioning micro-extrusion die

Info

Publication number: CN101733300B
Application number: CN2009102730900A
Authority: CN
Inventors: 吴晓; 李建军; 郑志镇; 周华民
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2009-12-04
Filing date: 2009-12-04
Publication date: 2011-11-30
Anticipated expiration: 2029-12-04
Also published as: CN101733300A

Abstract

The invention provides a self-positioning micro-extrusion die, which is used for the extrusion molding of miniature three-dimensional precise parts. The device comprises a die cavity in which a sliding ring capable of sliding up and down is arranged, wherein the centre of the sliding ring is provided with an inverted round platform-shaped groove; a molding section and a positioning and guiding section of a male die are positioned in the centre of the groove; two split female dies are arranged in the sliding ring; a cavity between the inner walls of the two female dies and the molding section of the male die is formed into an impression cavity; the inner walls of the two female dies and the positioning and guiding section of the male die are in clearance fit in an extrusion and downward moving process to play a role in positioning and guiding; an extrusion punch is arranged right above the impression cavity; and a fixed section of the male die is fixed on a de-molding mechanism which is operated to ensure that the female dies move upwards along the sidewall of the sloping surface of the inverted round platform-shaped groove respectively, and are separated in a horizontal direction and then the male die move upwards to realize de-molding. As the relative positions of the male die and the female dies are determined only by the clearance fit between the inner walls of the female dies and the positioning and guiding section of the male die when the self-positioning micro-extrusion die is molded, the self-positioning micro-extrusion die has high molding accuracy and a simple structure.

Description

A kind of self-positioning micro-extrusion die

Technical field

The present invention relates to little shaping field, particularly relate to a kind of micro-extrusion die of the three-dimensional micro part that is used to be shaped.

Background technology

Along with the continuous development of MEMS, increasing to the demand of miniature parts, the microminiaturization of accessory size (micron order or submicron order) brings great difficulty for the processing of part, and shape is especially difficult than the processing technology of complicated three-dimensional micro part.Traditional moulds mechanism generally adopts guide-localization mechanisms such as guide pillar guide pin bushing or alignment pin to guarantee machining accuracy, the guiding of mould self and position error directly influence the precision of part to be processed, and the error of centralization of force application mechanism also can be added on the part to be processed, these accumulated errors often substantially exceed the order of magnitude that the miniature parts error is allowed, therefore traditional mould structure has not been suitable for the processing miniature parts.And new micro fabrications such as laser processing technology, photoetching technique, sacrificial layer technology can improve machining accuracy to a certain extent, but need to drop into expensive corollary equipment, the cost height, complex process, be difficult to promote, this just needs a kind of low cost of development, high accuracy, high-quality little forming process and micro-forming device.

Summary of the invention

The invention provides a kind of self-positioning micro-extrusion die, low to overcome traditional accurate three-dimensional micro component die forming accuracy, complex structure, the shortcoming that technology is loaded down with trivial details and cost is high.

A kind of self-positioning micro-extrusion die, comprise die cavity, it is characterized in that, be provided with the slip ring that can slide up and down along the die cavity sidewall in the die cavity, the slip ring bottom is provided with elastic supporting member for supporting optical member, the center of slip ring has rounding bench-type groove, and the top of punch is positioned at the center of groove, and the top of punch is divided into profiled section and positioning and guiding section from top to bottom; In the slip ring be that the center is laid two lobes and closed die with the punch, the cavity formation die cavity between two die inwalls and the punch profiled section, two die inwalls push in the moving process downwards and punch positioning and guiding section between play the positioning and guiding effect by matched in clearance; Be provided with the extruding drift directly over the die cavity; Mould emptier is fixed in the lower part of punch, and the running mould emptier makes die move on the domatic sidewall of rounding bench-type groove respectively and separate in the horizontal direction, the punch realization demoulding that moves up then.

Technique effect of the present invention is embodied in: the relative position of punch-die was only by die inwall and the intersegmental matched in clearance decision of punch positioning and guiding when the present invention was shaped, and be not subjected to the influence of the error of centralization and other fractional errors of mould of former force application mechanism, drift, the forming accuracy height.Utilize rounding bench-type groove to realize that side direction divides mould and utilize the speed difference protruding, that die rises to realize ejecting of product during the demoulding.The present invention need not increase extra detent mechanism, and is simple in structure, cost is low.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the invention;

Fig. 2 is the A-A cutaway view of Fig. 1;

Fig. 3 is the partial enlarged drawing of Fig. 1;

Fig. 4 is the punch structure schematic diagram.

The specific embodiment

The present invention is described in further detail below in conjunction with drawings and Examples.

Mould mainly comprises die cavity, punch, die, slip ring, extruding drift and mould emptier.As Fig. 1, shown in 2,3, die cavity is made of die holder 1 and die holder cover plate 9, and the middle part of die holder 1 is provided with slip ring 6, and the side arm of die holder 1 has conduit, and its crest clearance with slip ring 6 cooperates, and the motion of slip ring 6 is play the guiding role.The bottom of slip ring 6 is provided with spring stack 12, is with spring 13 on the spring stack 12.The center of slip ring 6 has rounding bench-type groove, and the top of punch is positioned at this groove center, and slip ring is interior to be that two box-like dies of lobe are laid at the center with the punch.Two box-like die 7a of lobe, 7b and slip ring 6 cone match, slip ring 6 closes die 7a with lobe simultaneously, be provided with guiding dovetail groove 15 between the 7b, and adopt than loose gap, its main purpose is to guarantee that when the demoulding thereby two lobes close die and rise along dovetail groove respectively and separate in the horizontal direction each other, realizes that side direction divides mould.Lobe closes the die lower surface and has inclined hole 7-1.

Mould emptier is fixed in the lower part of punch; the embodiment of mould emptier is: be fixed with die holder mold insert 2 on die holder 1 base; 3 location of 2 pairs of slide blocks that set within it of die holder mold insert and guide effect; vertically have two push-rod hole 3-2 in the slide block 3, two push-rod holes all are communicated with the ejector pin retaining plate groove 3-3 of slide block 3 bottoms.Two push rods 4 pass a push-rod hole 3-2 respectively, stretch into ejector pin retaining plate groove 3-3 and are fixed on the ejector pin retaining plate 4-1 of putting within it.Knock-pin 14 adopts with die holder 1 and is threaded, and its upper end contacts with ejector pin retaining plate 4-1, and die holder 1 bottom is stretched out in the lower end.

As shown in Figure 4, punch 5 is designed to the form of four sections multidiameters, and from top to bottom, shaped segment 5-1 plays the shaping effect; Excessively section 5-2 is used for being connected between shaped segment 5-1 and positioning and guiding section 5-3; During extrusion molding, the matched in clearance between the positioning and guiding section 5-3 of column type and the two die inwalls that move down plays the positioning and guiding effect; Canned paragraph 5-4 is sleeved among the hole 3-1 of slide block 3 upper ends, and is radially leaving big gap; Sphere is adopted in the lower surface of the canned paragraph 5-4 of punch 5, is convenient to it and is moving radially.Therefore punch 5 radially is being in quick condition before being shaped, being extruded part precision only is subjected to lobe to close the influence of quality of fit of the positioning and guiding section 5-3 of inwall forms after the die closure lower end macropore 7-2 and punch 5, and be not subjected to the influence of the error of centralization and other fractional errors of mould of former force application mechanism, drift, the forming accuracy height.

Be provided with extruding drift 8 directly over the die cavity; and adopt the matched in clearance of pine with the centre bore of die holder cover plate 9; spacing cushion block 10 is set on die holder cover plate 9; the thickness of adjusting cushion block 10 can be controlled the maximum displacement of extruding drift 8; thereby protection punch 5 can also play the effect of control blank extruding degree simultaneously.

As shown in Figure 1, before being shaped under the effect of deadweight two lobes close die 7a and 7b is in closure state, the shaped segment 5-1 of described punch 5 and changeover portion 5-2 are in two lobes and close in the hole that the die inwall forms, like this two lobes close die in be formed centrally the die cavity 7-3 (as shown in Figure 3) of a upper end open.Blank 11 is put into this die cavity, lay and adjust cushion block 10 and drift 8, the bottom end cover of described drift 8 makes the die cavity sealing on the opening of die cavity.The force application mechanism of former is pressed onto on the drift 8, and drift 8 is pressed onto two lobes and closes on the die.Because cone match, lobe closes die 7a and 7b and drives slip ring 6 when descending and move down synchronously, while two lobes close die and are carved tightly owing to be subjected to relative horizontal component, form up-small and down-big shoulder hole between its inwall, the positioning and guiding section 5-3 of lower end macropore 7-2 and punch 5 adopts matched in clearance, play positioning action (because drift 5 radially is being in quick condition, the lower end macropore 7-2 decision that forms after the die closure is closed in its exact position radially by lobe).Driving lobe when drift 8 moves down, to close die 7a and 7b and slip ring 6 whole descending, and punch 5 be fixed on can not be descending on the described slide block 3, so blank is compressed distortion in die cavity, spring 13 is compressed simultaneously.After shaping is finished, remove drift 8, it is up in a small amount under the effect of spring 13 that slip ring 6 and lobe close die (7a and 7b).When taking off part, rotation knock-pin 14, it is up to drive push rod 4, when upper end and the lobe of push rod 4 closes the die lower surface when contact, will force two lobes to close die 7a and 7b up along dovetail groove, the while horizontal direction is separated, i.e. undercut.This process mesopetalum closes die and there is relative motion in the horizontal direction in push rod 4, after two lobes close die undercut certain distance, push rod 4 enters the inclined hole 7-1 that lobe closes the die lower end, ejector pin retaining plate 4-1 contacts with the upper surface of the ejector pin retaining plate groove 3-3 of slide block 3 simultaneously, continue rotation knock-pin 14, slide block 3 beginnings are up, and promote to move on the product by punch 5.This moment, lobe closed die and punch 5 is all up, but because push rod 4 has been among the inclined hole 7-1, and lobe closes speed that die rises will be less than punch 5 rates of climb, so formation of parts will be ejected die and takes out.

Change just can the be shaped miniature parts of difformity and size of shape, size that lobe closes die or punch shaped segment.Mould emptier is not limited to the above embodiment of the present invention, die is moved on the domatic sidewall of rounding bench-type groove respectively and separates in the horizontal direction as long as can reach, and the punch purpose that realizes the demoulding that moves up gets final product then.

Claims

1. self-positioning micro-extrusion die, comprise die cavity, it is characterized in that, be provided with the slip ring that can slide up and down along the die cavity sidewall in the die cavity, the slip ring bottom is provided with elastic supporting member for supporting optical member, the center of slip ring has rounding bench-type groove, and the top of punch is positioned at the center of groove, and the top of punch is divided into profiled section and positioning and guiding section from top to bottom; In the slip ring be that the center is laid two lobes and closed die with the punch, the cavity formation die cavity between two die inwalls and the punch profiled section, two die inwalls push in the moving process downwards and punch positioning and guiding section between play the positioning and guiding effect by matched in clearance; Be provided with the extruding drift directly over the die cavity; Mould emptier is fixed in the lower part of punch, and the running mould emptier makes die move on the domatic sidewall of rounding bench-type groove respectively and separate in the horizontal direction, the punch realization demoulding that moves up then.

2. self-positioning micro-extrusion die according to claim 1; it is characterized in that; mould emptier is specially: be fixed with the die holder mold insert in the die cavity bottom; be provided with slide block in the die holder mold insert; upper end of slide block has the punch patchhole that is used to lay the punch lower part; punch patchhole and the punch in it leave the gap diametrically; the punch both sides longitudinally have a push-rod hole in the slide block; two push-rod holes all are communicated with the ejector pin retaining plate groove of offering the slide block bottom; be inserted with push rod in the push-rod hole; two push rod bottoms are stretched into the ejector pin retaining plate groove and are fixed on the ejector pin retaining plate of putting within it; the upper end of knock-pin contacts with ejector pin retaining plate; die cavity bottom is stretched out in the lower end, in addition two lobes close the die lower surface respectively symmetry have a hole.