CN2551437Y

CN2551437Y - Screw type metal injection molder capable of releasing pressure

Info

Publication number: CN2551437Y
Application number: CN 02239988
Authority: CN
Inventors: 吴奇颖; 王后; 许建顺
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-06-14
Filing date: 2002-06-14
Publication date: 2003-05-21
Anticipated expiration: 2012-06-14

Abstract

A screw rod type metal projecting shaping machine which can release pressure is disclosed. The utility model is an improvement suitable for the metal melted material projecting shaping machine. Screw threads which can reduce pressure gradually is arranged on the screw rod, after the screw threads are respectively arranged on the normal screw threads positioned at the front side and nested normally in the material feeding cylinder in a separated arrangement way, the pressure reducing screw threads preserved with a pressure releasing gap between the material feeding cylinder walls are continuously arranged at the rear part of the normal pressure screw threads one by one, and the continuous arrangement forms the whole section of screw rod; wherein, the pressure reducing screw threads can comprise the changing types of short screw threads with lower thread height, weak screw threads with thinner thread wall, and circularly arranged multi-leaf shaped screw threads presenting different thread height. Therefore, when the screwing of the normal pressure screw threads drive the metal melted material to move forward, if the reverse anti-expansion pressure of the melted material generated in the material feeding cylinder is excessive, the preserved material slots between the gradually pressure reducing screw threads and the material feeding cylinder wall continuously arranged at the rear part enable partial fed melted material to avoid the continuous forward pushing force temporarily under the condition that pressure reducing pushing of the screw threads is inadequate, to reduce an excessive torque on the instant bearing of the screw rods. Therefore, the excessive pressure generated on the partial screw thread surface instantly because of the excessive pushing between the non-melted grains of the metal melted material in the cylinder can be realized instantly, to protect the screw rod not to be clipped in the cylinder, twisted or damaged.

Description

But the screw metal ejection formation machine of release of pressure

Technical field

The utility model relates to the metal ejection formation machine, but a kind of screw metal ejection formation machine of release of pressure particularly.I.e. setting unit decompression screw thread one by one on screw rod is arranged on one in the front side, in the feed cylinder after the normal pressure thread of normal fit in interval stagger arrangement mode, and promptly one section decompression screw thread of configuration continues at the rear of normal pressure thread one by one.

Background technology

Jet forming machine in the past, as shown in Figure 1, it mainly is the use that cooperates mould, make raw material become the melting shape through heat treated in advance, be commonly referred to as melt material after, via the mode that back segment feeding machanism 1 is pushed so as to pressure, will melt the material S outpour by outpouring mouth 11 places, and enter the external form of finishing finished product in the mould, the accurate making of size, very extensive in the industry utilization.And the raw material of traditional ejection formation usefulness that mechanism produces mainly is a plastic raw materials various or that mix, its fusing point because of plastic raw materials is lower, particle is thinner, and epigranular, make the feed of this type of shaping mechanism operate, all be to adopt simple screw type feeding screw bolt 12, its structure is comparatively simple, and fault rate is also lower.

Yet, because of the progress of industry and to many-sided requirements such as finished product rerum natura, texture, intensity, make many products (as computer housing) gradually change moulding substituting as plastic products with metal (as magnesium, aluminium alloy).In the utilization of Jet forming machine and technology, though identical haply, two kinds of raw materials of isomorphism type not but because of the notable difference on fusing point, cooling velocity or the like the rerum natura, cause on the type that adopted or the operating condition completely different.Wherein difference particularly in:

The density of raw metal own, quality etc. are high than plastics all, and it pushes the granularity after the heating melting is handled, can't as the plastic raw materials evenly, the feeding machine that so causes traditional Jet forming machine, doing the dead axle precession with the feeding screw bolt of stage casing helical form coupling, the thread of establishing so as to its side face ring 121 forms the pressure of pushing forward, and desire will be melted when expecting to outpour, as preceding taking off accompanying drawing 1 described simple screw type feeding screw bolt 12, comprise that the tooth of each thread 121 equates for equal, the wide A3 of tooth for equal, the high A2 of tooth apart from A1; Or be same as the variation screw-type that this type of does not have active release of pressure function, do forward and backwardly to be divided into two sections or three sections as whole screw rod 12; And each threaded section such as tooth being set when the different thread feeding strength of A1 changes pattern, the metal that then tends to take place poly-tight shape melts material S in the feed cylinder 13 between thread 121 facings in twos, and the saturated improper extruding phenomenon of excessive pressure takes place; And under the situation of screw rod 12 continuous precessions, that adds up gradually melts material pressure because of being subjected to the restriction that the place ahead feed cylinder outpours mouth 11 place's quantitative dischargings, and the oppositely anti-pressure of opening of paired thread 121 facings of heap-shaped, when surpassing the mistake macro-energy of screw rod 12 axostylus axostyle power own, the card boring phenomenon of screw rod 12 lag switch in feed cylinder 13 promptly takes place quite easily; Even powerful tension stress backward will be given birth to firmly when serious screw rod 121 facings is twisted off or turn over destructions such as facing deforms, distortion; And, generally be converted into the ejection formation making of raw metal by the plastics ejaculator, or lack the operator of this type of metal ejection formation experience, all be to increase screw rod body and facing intensity, as increase on the facing thickness and consider design, so relative on the contrary increase the probability of aforementioned generation card boring, and particularly when the explosion phenomenon of excessive pressure takes place, cause the damage of whole group feeding machine, these problems are seriously perplexing the development of the industry all the time.

Summary of the invention

Main purpose of the present utility model is that a kind of defective at prior art is being provided; arranged spaced one decompression screw thread continues at the rear of special normal pressure thread on screw rod; whereby; the material that melts excessive in the feed cylinder takes place oppositely resists when opening pressure; staying between decompression screw thread and feeding jar wall established the material seam; the decrement that promptly forms by the not enough width of cloth facing of decompression screw thread advances; the material that melts that part is infeeded is avoided for the time being continuously towards forward thrust; and then alleviate screw rod and hold anti-torsion; make excess pressure on screw rod and the thread facing; can reach moment thus mediates, and makes feeding screw bolt can not block boring or twisted off firmly; the enthusiasm protective effect that damages.

An of the present utility model purpose is that a kind of variation design of described feeding screw bolt thread configuration is being provided, reaching relaxes put that feed cylinder internal cause adopts that ejection formation operation institute that metal melts material often takes place suddenly the positive function of imperial palace pressure phenomenon, especially the simple property of changing with need not arrange in pairs or groups other pressure relieving valve or feed cylinder structure, device, have easy, easy system, and the minimum economic benefit of cost cost.

It is the mode with the interval stagger arrangement that but the screw metal ejection formation machine of the release of pressure of the utility model design comprises unit decompression screw thread on the screw rod, with its be separately positioned on one in front side, can be in the feed cylinder normal fit and precession form will melt material push to forward outpour play the normal pressure thread of mainly pushing pressure when mouth outpours after, promptly continue and be reserved with the decompression screw thread in release of pressure slit between configuration one and wall of feeding jar, be provided with so continuously and constitute whole section screw rod at the rear of normal pressure thread one by one; The configuration of decompression screw thread whereby; make the metal that takes place in the feed cylinder melt the material excess pressure; can be reached moment by the decrement progradation of the not enough width of cloth facing in decompression screw thread place mediates backward; can not block situations such as boring or screw rod, thread are twisted off firmly, damage with the protection feeding screw bolt, and can make the material that melts in the feed cylinder supply smooth and easy carrying out.

Wherein, melt the release of pressure slit of expecting row pressure backward for reserving to provide between configuration and wall of feeding jar, it is low short shape thread that decompression screw thread is arranged to the tooth height high than normal pressure thread tooth; The thread height that is reduced by this place directly and form still not enoughly in the size slit of normal fit between wall of feeding jar, makes the part of excess pressure melt material and finishes row pressure backward by this place.

Described release of pressure thread can also be set to the tooth wall and be thin weak power thread than normal pressure thread tooth wall; By the thin tooth wall thickness in this place, even what produce excessive pressure melts material when being stopped by the stronger normal pressure thread of body tension force, i.e. row pressure and push this weak power thread place to backward, and will pushing over backwards a little, make between its apical margin and wall of feeding jar to form still not enoughly, make the part of excess pressure melt material and finish row pressure backward by this place in the size slit of normal fit.

Described release of pressure thread can also be set to side face and have several annular zigzag threads of shape recess slightly; By this indent directly and forms still not enoughly between wall of feeding jar, make the part of excess pressure melt material and finish row pressure backward by this place in the normal size slit of fit.

But the screw metal ejection formation machine of the release of pressure of the utility model design has overcome the defective of prior art; alleviate the metal that takes place in the feed cylinder fully and melted the material excess pressure; promptly reach moment and mediate backward, to reach the effect of the smooth and easy charging of protection feeding screw bolt by the decrement progradation of the not enough width of cloth facing of decompression screw thread.Especially the simple property of changing with need not arrange in pairs or groups other pressure relieving valve or feed cylinder structure, device has easy, easy system, and the minimum economic benefit of cost cost.

But further describe structure, purpose and the effect of screw metal ejection formation machine of the release of pressure of the utility model design below in conjunction with drawings and Examples.

Description of drawings

Accompanying drawing 1 is implemented legend for the plane of existing feeding screw bolt structure.

Accompanying drawing 1-A is the thread position mark figure of accompanying drawing 1.

But legend is implemented on the plane of a preferred embodiment of the screw metal ejection formation machine of the release of pressure that accompanying drawing 2 designs for the utility model.

Accompanying drawing 2-A is the mark figure of thread position described in the accompanying drawing 2.

But legend is implemented on the plane of another preferred embodiment of the screw metal ejection formation machine of the release of pressure that accompanying drawing 3 designs for the utility model.

Accompanying drawing 3-A is the mark figure of thread position described in the accompanying drawing 3.

But legend is implemented on the plane of the another preferred embodiment of the screw metal ejection formation machine of the release of pressure that accompanying drawing 4 designs for the utility model.

Accompanying drawing 4-A is the mark figure of thread position described in the accompanying drawing 4.

At existing structure, promptly label is expressed as respectively described in accompanying drawing 1 and the accompanying drawing 1-A: 1 is feeding machanism; 11 for outpouring mouth; 12 is feeding screw bolt; 121 is thread; 13 is the feed cylinder; A1 is the tooth distance; A2 is the tooth height; A3 is that tooth is wide; S is for melting material;

In the utility model structure, promptly label is expressed as respectively described in the accompanying drawing 2-4: 2 are feeding machanism; 21 is the feed cylinder; 22 is feeding screw bolt; 221 is the normal pressure thread; 222 is decompression screw thread; 222A is short shape thread; 222B is weak power thread; 222C is the zigzag thread; A221 is the tooth height; A222 is the tooth height; B221 is the tooth wall; B222 is the tooth wall; 23 for outpouring mouth; 2R (2RA, 2RB, 2RC) is a reserving gaps.

The specific embodiment

Please at first consult shown in accompanying drawing 2 and the accompanying drawing 2-A: the utility model pin is to the structural improvement of special use feeding screw bolt 22 in metal melts the feed cylinder 21 of feeding machanism 2 of material Jet forming machine, it is characterized in that:

The short shape thread of unit 222A on the screw rod 22, it is mode with the interval stagger arrangement, with its be separately positioned on comprise one be positioned at the front side, can feed cylinder 21 normal fits and precession form will melt material S push to forward outpour play the normal pressure thread 221 of mainly pushing pressure when mouth 23 outpours after, and described decompression screw thread 222 all and feed cylinder 21 casing walls between be reserved with release of pressure slit 2R.Be provided with so continuously and constitute whole section screw rod 22; Therefore the configuration of decompression screw thread 222, when mainly squeezing metal and melt material S and advance, take place metal feed cylinder 3 in forward and melt excessive oppositely anti-of material S and open the pressure generation by attacking of normal pressure thread 221, be arranged on the decompression screw thread piecemeal 222 at its rear, i.e. pre-configured because of reserving gaps 2R one by one, under " decrement " propelling situation of decompression screw thread 222 because of not enough width of cloth facing, the material S that melts that part is infeeded avoids the thrust of Gong advancing continuously for the time being forward in this position, place; And with this part release of pressure melt the material S, next the normal pressure thread 221 by the precession that continues advances forward immediately; So; promptly alleviated screw rod 22 and held excessive torsion of anti-moment immediately; alleviate these normal pressure thread 221 places and excessively push and reach because of metal melts material S melting is not intergranular; the local thread facing excess pressure phenomenon of hurried generation; and making that the precession of feed rods 22 is that feed can smooth and easyly carry out, situations such as card boring or screw rod 22, normal pressure thread 221 are twisted off firmly to avoiding, damage have positive protective effect.

Wherein, melt the material S release of pressure slit 2R of row pressure backward for reserving between configuration and feed cylinder 21 casing walls to provide, it is low short shape thread 222A than the high A221 of normal pressure thread 221 teeth that decompression screw thread 222 can be arranged to the high A222 of tooth; Thread height by this place reduces directly with between feed cylinder 21 casing walls forms still not enough size slit 2RA at normal fit, makes the part of excess pressure melt and expects that S finishes row pressure backward by this place, shown in accompanying drawing 2, accompanying drawing 2-A.

In addition, melt material S the release of pressure slit 2R of row pressure is identical backward with reserving between feed cylinder 21 casing walls to provide, decompression screw thread 222 can also be provided with tooth wall B222 and be thin weak power thread 222B than normal pressure thread 221 tooth wall B221; By the thin tooth wall B222 thickness in this place (that is being that the body tension force of thread herein is weak), even what produce excessive pressure melts material S when the normal pressure thread 221 of strong (that is being that the tooth wall thickness is thicker) stops by body tension force, i.e. row pressure and push this weak power thread 222B place to backward, and with it pushing over backwards a little, make and form still not enough size slit 2RB between its apical margin and feed cylinder 21 casing walls at normal fit, make the part of excess pressure melt material S and finish row pressure backward, shown in accompanying drawing 3, accompanying drawing 3-A by this place.

Again and, melt material S the release of pressure slit 2R of row pressure be identical backward with reserving between feed cylinder 21 casing walls to provide, decompression screw thread 222 can also be arranged to side face and have several annular zigzag thread of shape recess 222C slightly; By this recess position directly with forms still not enoughly between feed cylinder 21 casing walls at the normal size slit 2RC of fit, make the part of excess pressure melt and expect that S finishes row pressure backward by this place, shown in accompanying drawing 4, accompanying drawing 4-A.

Claims

But 1, a kind of screw metal ejection formation machine of release of pressure, it is characterized in that: unit decompression screw thread on the screw rod, it is mode with the interval stagger arrangement, with its be separately positioned on one in front side, can be in the feed cylinder normal fit and precession form will melt material push to forward outpour play the normal pressure thread of mainly pushing pressure when mouth outpours after, promptly continue and be reserved with the decompression screw thread in release of pressure slit between configuration one and wall of feeding jar, be provided with so continuously and constitute whole section screw rod at the rear of normal pressure thread one by one.
But 2, the screw metal ejection formation machine of release of pressure as claimed in claim 1, it is characterized in that melting the release of pressure slit of expecting row pressure backward for reserving to provide between configuration and wall of feeding jar, it is low short shape thread that decompression screw thread is arranged to the tooth height high than normal pressure thread tooth.
But, it is characterized in that the release of pressure thread is set to the tooth wall and is thin weak power thread than normal pressure thread tooth wall 3, as the screw metal ejection formation machine of claims 1 described release of pressure.
But 4, the screw metal ejection formation machine of release of pressure as claimed in claim 1 is characterized in that the release of pressure thread is set to side face and has several annular zigzag threads of shape recess slightly.