CN109702976B - Injection molding machine for metal powder melt injection - Google Patents
Injection molding machine for metal powder melt injection Download PDFInfo
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- CN109702976B CN109702976B CN201910171199.7A CN201910171199A CN109702976B CN 109702976 B CN109702976 B CN 109702976B CN 201910171199 A CN201910171199 A CN 201910171199A CN 109702976 B CN109702976 B CN 109702976B
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- 238000002347 injection Methods 0.000 title claims abstract description 177
- 239000007924 injection Substances 0.000 title claims abstract description 177
- 239000002184 metal Substances 0.000 title claims abstract description 64
- 239000000843 powder Substances 0.000 title claims abstract description 60
- 238000001746 injection moulding Methods 0.000 title claims abstract description 28
- 230000033001 locomotion Effects 0.000 claims abstract description 13
- 230000000712 assembly Effects 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- 229920002521 macromolecule Polymers 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000926 separation method Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
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- 230000006835 compression Effects 0.000 description 5
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- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 239000000155 melt Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012768 molten material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
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- 239000007921 spray Substances 0.000 description 1
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- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an injection molding machine for injecting metal powder melt, which comprises a frame, a mold closing system, an injection system and a control system, wherein the injection molding machine is used for realizing the opening and closing of a mold arranged on the injection molding machine; the injection screw comprises a screw body, a screw rod and a screw rod, wherein the screw body is used for being fixedly connected with the screw rod; the injection screw is connected with the die closing system and the injection system and is used for controlling the opening and closing of a die of the die closing system and controlling the injection screw to perform pulse rotation and pulse axial reciprocating motion in the charging barrel during injection. The injection screw is controlled by the control system to perform pulse rotation and pulse axial reciprocating motion in the charging barrel during injection, free volume increase and mutual separation effect between macromolecules in the metal powder melt can be promoted in the injection process, and disentanglement of macromolecule chains and chain segments is promoted, so that viscosity and elasticity of the metal powder melt are reduced, and fluidity is enhanced.
Description
Technical Field
The invention relates to the technical field of injection molding machines, in particular to an injection molding machine for injecting metal powder melt.
Background
The injection molding is to plasticize, melt and homogenize the material, then to inject the material into the cavity of the mold, and to maintain the pressure, cool, solidify and shape the molten material through the cavity to obtain the final product. In order to obtain a green body with high density, high strength and good uniformity in the partial injection molding process, metal powder is generally required to be added into a molten material to prepare a slurry with low relative viscosity and high solid phase volume fraction, and then the organic monomer in the slurry is polymerized to solidify the slurry in situ.
But the metal powder melt that forms after the melt adds the metal powder compares non-metal and adds the material melt, and the density of metal powder melt increases, and mobility is variation, and viscosity improves, and degree of consistency reduces, easily produces the bonding material phenomenon to easily attract impurity, influence injection molding quality, also can corresponding increase to injection molding equipment's surface damage simultaneously.
Disclosure of Invention
One object of an embodiment of the invention is to: an injection molding machine for metal powder melt injection is provided which can effectively improve injection quality.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an injection molding machine for injecting a metal powder melt is provided, comprising a frame, a mold closing system, an injection system and a control system;
the die closing system is arranged on the frame and used for realizing the opening and closing of a die arranged on the die closing system;
the injection system is arranged on the frame and used for injecting metal powder melt into a cavity of the die, and comprises a plasticizing component, wherein the plasticizing component comprises a charging barrel and an injection screw arranged in the charging barrel;
the control system is arranged on the frame, connected with the mold closing system and the injection system and used for controlling the opening and closing of a mold of the mold closing system and controlling the injection screw to perform pulse rotation and pulse axial reciprocating motion in the charging barrel during injection.
As a preferable technical scheme of the invention, the injection system further comprises a hydraulic motor, an injection oil cylinder assembly, a hopper assembly and an injection seat assembly;
the hydraulic motor is in transmission connection with the injection screw and is used for driving the injection screw to rotate;
the injection oil cylinder assembly is connected with the hydraulic motor and used for driving the hydraulic motor and the injection screw rod to do reciprocating motion along the axial direction of the injection screw rod;
the hopper assembly is arranged on the plasticizing assembly and is used for providing metal powder melt for injection for the charging barrel;
the hydraulic motor, the injection oil cylinder assembly and the plasticizing assembly are movably arranged on the injection seat assembly, and the injection seat assembly is fixedly arranged on the frame.
As a preferable technical scheme of the invention, the injection seat assembly comprises an injection seat and a plurality of sliding assemblies arranged on the injection seat, the sliding assemblies can do reciprocating motion along the axial direction of the injection screw, and the hydraulic motor, the injection oil cylinder assembly and the plasticizing assembly are arranged on the sliding assemblies.
As a preferable technical scheme of the invention, the plasticizing assembly further comprises a fixing seat, the fixing seat is fixedly arranged on the sliding assembly, the charging barrel is detachably arranged on the fixing seat, the injection screw rod is movably arranged on the fixing seat in a penetrating mode, the charging hopper assembly is detachably arranged on the fixing seat, a feeding channel is correspondingly arranged on the fixing seat and used for communicating the charging hopper assembly and a feeding hole of the charging barrel, a hydraulic rod is arranged on the fixing seat, and a movable end of the hydraulic rod is connected with a fixed die plate of the die assembly system and used for controlling a jet nozzle of the charging barrel to be tightly connected with a gate of the die assembly system.
As a preferable technical scheme of the invention, the injection oil cylinder assembly comprises an injection oil cylinder, wherein the fixed end of the injection oil cylinder is arranged on the fixed seat, and the movable end of the injection oil cylinder is connected with the hydraulic motor and is used for driving the hydraulic motor to drive the injection screw rod to reciprocate along the axial direction of the injection screw rod on the injection seat.
As a preferable technical scheme of the invention, the control system comprises a plurality of hydraulic pumps and a control terminal, wherein the hydraulic pumps are connected with the control terminal, and the hydraulic pumps are respectively connected with the hydraulic motor, the injection cylinder assembly and the control terminal of the die closing system.
As a preferable technical scheme of the invention, the control system controls the injection screw to make forward rotation, pause and forward rotation pulse rotation in the charging barrel during injection.
As a preferable technical scheme of the invention, the time interval between the forward rotation and the suspension action of the injection screw is in the range of 0.02-1S.
As a preferred technical scheme of the invention, the control system controls the injection screw to make forward, backward and forward pulse axial reciprocating motion along the axial direction in the charging barrel during injection.
As a preferable technical scheme of the invention, the time interval of the forward, backward and forward of the injection screw is in the range of 0.02-1S.
The beneficial effects of the invention are as follows: the injection screw is controlled by the control system to perform pulse rotation and pulse axial reciprocating motion in the charging barrel during injection, free volume increase and mutual separation effect between macromolecules in the metal powder melt can be promoted in the injection process, and disentanglement of macromolecule chains and chain segments is promoted, so that viscosity and elasticity of the metal powder melt are reduced, flowability is enhanced, and the melt can be filled, compacted and molded at lower temperature and pressure.
Drawings
The invention is described in further detail below with reference to the drawings and examples.
FIG. 1 is a schematic view of an injection molding machine for injecting molten metal powder according to an embodiment of the present invention.
Fig. 2 is an exploded view of an injection molding machine for metal powder melt injection according to an embodiment of the present invention.
Fig. 3 is a schematic view of the structure of the barrel and injection screw according to an embodiment of the present invention.
Fig. 4 is an enlarged view at a in fig. 3.
In the figure:
1. a frame; 2. a mold closing system; 3. an injection system; 31. plasticizing the component; 311. a charging barrel; 3111. a spray nozzle; 312. a fixing seat; 313. a hydraulic rod; 314. an injection screw; 3141. a shunt body; 3142. a first accommodation groove; 3143. a second accommodation groove; 3144. a main diverter wing; 3145. a diversion trench; 3146. auxiliary diverting wings; 3147. a non-return valve; 3148. non-return meson; 3149. a limit protrusion; 32. a hydraulic motor; 33. an injection cylinder assembly; 341. an injection seat; 342. a sliding assembly; 4. a control system; 41. a hydraulic pump.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
As shown in fig. 1 to 4, in the present embodiment, an injection molding machine for injecting metal powder for molten metal injection according to the present invention includes a frame 1, a mold clamping system 2, an injection system 3, and a control system 4, wherein the mold clamping system 2 is disposed on the frame 1 for opening and closing a mold mounted thereon; the injection system 3 is arranged on the frame 1 and is used for injecting metal powder melt into a cavity of a die, and comprises a plasticizing assembly 31, wherein the plasticizing assembly 31 comprises a charging barrel 311 and an injection screw 314 arranged in the charging barrel 311; the control system 4 is arranged on the frame 1, is connected with the die closing system 2 and the injection system 3, and is used for controlling the opening and closing of a die of the die closing system 2 and controlling the injection screw 314 to perform pulse rotation and pulse axial reciprocating motion in the charging barrel 311 during injection.
By arranging the control system 4 to control the injection screw 314 to perform pulse rotation and pulse axial reciprocating motion in the charging barrel 311 during injection, the free volume among macromolecules in the metal powder melt can be increased, the mutual separation effect is enhanced, and the disentanglement of macromolecule chains and chain segments is promoted, so that the viscosity and elasticity of the metal powder melt are reduced, the fluidity is enhanced, and the melt can be filled, compacted and molded at lower temperature and pressure.
The reduction of injection pressure, holding pressure and die temperature inevitably reduces injection power, shortens the molding cycle and achieves the effect of reducing energy consumption. In addition, injection and compaction are carried out under continuously changing pulsating pressure, so that metal powder melting stock can be well homogenized and mixed, compaction and fusion of front-end cold stock are promoted, air in a die cavity is discharged, and defects such as shrinkage cavity, surface collapse, welding line and the like possibly occurring in a product can be effectively reduced or eliminated. Meanwhile, the residual stress in the product can be controlled, and the quality of the product is effectively improved.
In the embodiment of the invention, the injection system 3 further comprises a hydraulic motor 32, an injection cylinder assembly 33, a hopper assembly and an injection seat 341 assembly; the hydraulic motor 32 is in transmission connection with the injection screw 314 and is used for driving the injection screw 314 to rotate; the injection cylinder assembly 33 is connected with the hydraulic motor 32 and is used for driving the hydraulic motor 32 and the injection screw 314 to reciprocate along the axial direction of the injection screw 314; the hopper assembly is arranged on the plasticizing assembly 31 and is used for providing injection metal powder melt for the charging barrel 311; the hydraulic motor 32, the injection cylinder assembly 33 and the plasticizing assembly 31 are movably arranged on an injection seat 341 assembly, and the injection seat 341 assembly is fixedly arranged on the frame 1.
In this embodiment, the control system 4 controls the injection screw 314 to perform the forward rotation, pause and forward rotation pulse rotation in the barrel 311 during the injection, and the time interval between the forward rotation and pause actions of the injection screw 314 is in the range of 0.02-1S.
By arranging the hydraulic motor 32 to drive the injection screw 314 to rotate in a forward, pause and forward pulse manner, the free volume among macromolecules in the metal powder melt can be increased, the mutual separation effect is enhanced, and the disentanglement of macromolecule chains and chain segments is promoted, so that the viscosity and elasticity of the metal powder melt are reduced, and the fluidity is enhanced.
In one embodiment of the present invention, the injection seat 341 assembly includes an injection seat 341 and a plurality of sliding assemblies 342 disposed on the injection seat 341, the sliding assemblies 342 being reciprocally movable along the axial direction of the injection screw 314, and the hydraulic motor 32, the injection cylinder assembly 33 and the plasticizing assembly 31 are disposed on the sliding assemblies 342.
Specifically, the sliding component 342 may be a guide rail component disposed on the injection seat 341 and a guide rail seat disposed on the guide rail component, and the guide rail component is parallel to the axial direction of the injection screw 314. The hydraulic motor 32, the injection ram assembly 33 and the plasticizing assembly 31 are all mounted to the rail mount such that the hydraulic motor 32, the injection ram assembly 33 and the plasticizing assembly 31 are free to move on the injection mount 341 in the axial direction of the injection screw 314.
In other embodiments, a sliding assembly 342 with a guide bar mating with a guide bar seat, or a sliding assembly 342 in the form of a dovetail may also be employed.
In the embodiment of the present invention, the plasticizing unit 31 further includes a fixing base 312, the fixing base 312 is fixedly disposed on the sliding unit 342, the charging barrel 311 is detachably disposed on the fixing base 312, the injection screw 314 is movably disposed on the fixing base 312 in a penetrating manner, the charging hopper unit is detachably disposed on the fixing base 312, a charging channel is correspondingly disposed on the fixing base 312 and is used for communicating the charging hopper unit with a charging port of the charging barrel 311, a hydraulic rod 313 is disposed on the fixing base 312, a movable end of the hydraulic rod 313 is connected with a fixed die plate of the die clamping system 2, and is used for controlling the injection nozzle 3111 of the charging barrel 311 to be tightly connected with a gate of the die clamping system 2.
By arranging the fixing seat 312 and arranging the charging barrel 311, the injection screw 314 and the hopper assembly of the plasticizing assembly 31 on the fixing seat 312, the fixation of the charging barrel 311, the injection screw 314 and the hopper assembly can be effectively realized. In addition, a hydraulic rod 313 is arranged on the fixing seat 312, and the movable end of the hydraulic rod 313 is connected with the fixed die plate of the die closing system 2, so that the injection nozzle 3111 of the charging barrel 311 can be tightly connected with the inlet gate of the die closing system 2, and the injection nozzle 3111 is tightly contacted with the inlet gate of the die during injection, so that the material leakage and the pressure relief are avoided.
In the embodiment of the present invention, the injection cylinder assembly 33 includes an injection cylinder, the fixed end of the injection cylinder is disposed on the fixed seat 312, and the movable end of the injection cylinder is connected to the hydraulic motor 32, so as to drive the hydraulic motor 32 to drive the injection screw 314 to reciprocate along the axial direction of the injection screw 314 on the injection seat 341.
In a specific embodiment, the control system 4 controls the injection screw 314 to axially reciprocate in the barrel 311 in the forward, backward, and forward directions during injection, and the time interval between the forward, backward, and forward directions of the injection screw 314 is in the range of 0.02S to 1S.
By arranging the injection cylinder, the injection screw 314 can be driven to do forward, backward and forward pulse reciprocating motions under the control of the control system 4, so that the metal powder melt is injected and compacted under the continuously changing pulsating pressure, and good homogenization and mixing can be obtained.
In the embodiment of the present invention, the control system 4 includes a plurality of hydraulic pumps 41 and a control terminal, and the plurality of hydraulic pumps 41 are all connected to the control terminal, and the hydraulic pumps 41 are respectively connected to the hydraulic motor 32, the injection cylinder assembly 33, and the control terminal of the mold clamping system 2.
By providing the hydraulic pump 41 connected to the hydraulic motor 32, the injection cylinder assembly 33 and the control end of the clamping system 2, and controlling the pumping oil of the hydraulic pump 41 through the control terminal, the above-mentioned pulse rotation and pulse axial reciprocation of the injection screw 314 in the cylinder 311 during injection can be conveniently achieved. And in particular the high frequency pulsed rotation and pulsed axial reciprocation of the injection screw 314 may be achieved by varying the amount of oil feed during control.
In the embodiment of the present invention, the injection screw 314 specifically includes a screw and a flow dividing component, the flow dividing component is detachably disposed at an end of the screw, the flow dividing component includes a flow dividing main body 3141, a main flow dividing wing 3144 and a sub flow dividing wing 3146, the plurality of main flow dividing wings 3144 are distributed on the flow dividing main body 3141 along an axial circumference of the flow dividing main body 3141, and the sub flow dividing wing 3146 is disposed on the flow dividing main body 3141 corresponding to the main flow dividing wing 3144 and is located at a side of the main flow dividing wing 3144 close to the screw.
By providing the main and sub-split wings 3144 and 3146 on the split main body 3141 of the split member, the friction area between the metal powder melt and the screw can be increased, the heat transfer area can be increased, the thickness of the flow layer of the metal powder melt can be reduced, the melting rate before injection can be increased, and the heat transfer efficiency and the heat uniformity can be improved. And the arrangement of the auxiliary flow dividing wings 3146 can enable the metal powder melt to be more uniform before being injected out of the injection nozzle 3111, so that segregation and solidification of the metal powder melt are not easy to generate, and the injection molding quality is ensured.
In the embodiment of the present invention, the main diversion wing 3144 is a plurality of wedge-shaped convex strips protruding on the diversion main body 3141, and a diversion trench 3145 for fluid to pass through is formed between two adjacent wedge-shaped convex strips.
Through protruding a plurality of wedge sand grip on reposition of redundant personnel main part 3141 to form guiding gutter 3145 between two adjacent wedge sand grip, can restrict the flow direction and the flow path of metal powder melt, reduce the flow layer thickness of metal powder melt, improve the melt rate of metal powder melt, and through changing the flow path of metal powder melt, can effectually improve the mixed degree of metal powder melt, improve metal powder melt homogeneity and thermal homogeneity.
In the embodiment of the present invention, the auxiliary diverting wings 3146 are a plurality of tooth-shaped protrusions protruding on the diverting body 3141, and at least two auxiliary diverting wings 3146 are arranged at intervals along the axial direction of the diverting body 3141.
Through set up vice reposition of redundant personnel wing 3146 on reposition of redundant personnel body, can mix the metal powder melt in advance before the metal powder melt enters into main reposition of redundant personnel wing 3144 region, improve the homogeneity of metal powder melt to reduce the composition agglomeration phenomenon of metal powder melt, make the quality of moulding plastics better.
In the embodiment of the present invention, a first accommodating groove 3142 is concavely formed between each layer of the auxiliary split wings 3146, and a second accommodating groove 3143 is concavely formed between the main split wing 3144 and the auxiliary split wings 3146 along the radial annular shape of the split main body 3141.
By recessing the first receiving groove 3142 between each of the sub-split wings 3146 and recessing the second receiving groove 3143 between the main split wing 3144 and the sub-split wings 3146, easily sticky impurities in the metal powder melt can be received therein when the metal powder melt flows therethrough, so that the impurities attached to the metal powder melt can be reduced, and the metal powder melt injected from the injection nozzle 3111 can be cleaner.
In a preferred embodiment of the present invention, the screw further comprises a non-return assembly disposed between the secondary split wing 3146 and the screw and sleeved on the split body 3141.
By sleeving the non-return component on the split main body 3141, the backflow of the metal powder melt in the injection work can be avoided or reduced, so that the purposes of avoiding raw material decomposition, saving energy and improving the working efficiency of injection molding products are achieved.
In a specific embodiment, the check assembly includes a check valve 3147 and a check washer 3148, the check valve 3147 is located on a side near the auxiliary split wing 3146, and a limit protrusion 3149 matched with the auxiliary split wing 3146 is protruding on a side of the check valve 3147 near the auxiliary split wing 3146 for limiting rotation of the check valve 3147.
Further, a conical surface matched with the check valve 3147 is arranged on one side, close to the check valve 3147, of the check valve 3148, and a conical hole is formed in one end, close to the check valve 3148, of the check valve 3147, corresponding to the conical surface.
By the mutual matching of the check valve 3147 and the check valve 3148, the check valve 3147 and the check valve 3148 are tightly attached to each other during external injection, and the metal powder melt flows through the check valve 3147; when injection is completed, the screw is retracted, separating the non-return valve 3147 from the non-return meson 3148, so that the metal powder melt in the barrel 311 enters the diverter assembly section and enters the injection preparation stage. And the check valve 3147 can restrict the movement of the check valve 3147 in the circumferential direction thereof by the insertion engagement between the stopper protrusion 3149 and the auxiliary diverting wing 3146, prevent the rotation of the check valve 3147, and prevent the entire check valve 3147 from totally striking the auxiliary diverting wing 3146 of the diverting shuttle when opened, so that the auxiliary diverting wing 3146 is deformed.
In a preferred embodiment, the surface of the non-return meson 3148 is concavely provided with a plurality of spiral grooves, and the arrangement of the grooves can effectively enhance the fluidity and friction area of the metal powder melting stock, increase uniformity and shearing property, and reduce wall sticking phenomenon in the ring diameter change area.
In the embodiment of the invention, the screw comprises a material conveying section, a compression section and a metering section, wherein the length proportion of the screw is 55% -65%:15% -35%:15% -25%. The tooth diameter ratio of the screw is 15-25 times, and the compression ratio is 1.5-2.5.
The length proportion of the material conveying section, the compression section and the metering section is set to 55% -65%:15% -25%:15% -25%, so that the adhesive in the metal powder melting stock is not deteriorated prematurely, the quality of the metal powder melting stock is ensured, the injection quality is improved, and the abrasion of the screw 21 is reduced.
Preferably, the length ratio of the material conveying section, the compression section and the metering section is 50%:35%:15%. The ratio of the tooth diameter of the screw was 20 times, and the compression ratio was 2.0.
In the description herein, it should be understood that the terms "upper," "lower," "right," and the like are used for convenience in description and simplicity of operation only, and are not to be construed as limiting the invention, as the devices or elements referred to must have, be constructed or operated in a particular orientation. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for providing a special meaning.
In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (10)
1. An injection molding machine for injecting metal powder melt is characterized by comprising a frame, a die closing system, an injection system and a control system,
the die closing system is arranged on the frame and used for realizing the opening and closing of a die arranged on the die closing system;
the injection system is arranged on the frame and used for injecting metal powder melt into a cavity of the die, and comprises a plasticizing component, wherein the plasticizing component comprises a charging barrel and an injection screw arranged in the charging barrel;
the control system is arranged on the frame, connected with the mold closing system and the injection system and used for controlling the opening and closing of a mold of the mold closing system and controlling the injection screw to perform pulse rotation and pulse axial reciprocating motion in the charging barrel during injection;
the injection screw specifically comprises a screw and a flow dividing component, wherein the flow dividing component is detachably arranged at the end part of the screw, the flow dividing component comprises a flow dividing main body, a main flow dividing wing and auxiliary flow dividing wings, a plurality of main flow dividing wings are circumferentially distributed on the flow dividing main body along the axial direction of the flow dividing main body, and the auxiliary flow dividing wings are correspondingly arranged on the flow dividing main body and are positioned at one side of the main flow dividing wings close to the screw;
the main flow dividing wing is a plurality of wedge-shaped convex strips which are convexly arranged on the flow dividing main body, and a flow guiding groove for fluid to pass through is formed between two adjacent wedge-shaped convex strips;
the auxiliary flow dividing wings are a plurality of tooth-shaped bulges convexly arranged on the flow dividing main body, and at least comprise two layers of auxiliary flow dividing wings which are arranged at intervals along the axial direction of the flow dividing main body;
a first accommodating groove is concavely formed between each layer of auxiliary diverting wings, and a second accommodating groove is concavely formed between the main diverting wings and the auxiliary diverting wings along the radial annular shape of the diverting main body;
the screw also comprises a non-return assembly, and the non-return assembly is arranged between the auxiliary diverting wing and the screw and sleeved on the diverting main body;
the non-return assembly comprises a non-return valve and a non-return meson, the non-return valve is positioned at one side close to the auxiliary split wing, and a limit bulge matched with the auxiliary split wing is convexly arranged at one side of the non-return valve close to the auxiliary split wing and used for limiting the rotation of the non-return valve;
one side of the non-return meson, which is close to the non-return valve, is provided with a conical surface matched with the non-return valve, and one end of the non-return valve, which is close to the non-return meson, is provided with a conical hole corresponding to the conical surface.
2. The injection molding machine for metal powder melt injection of claim 1, wherein the injection system further comprises a hydraulic motor, an injection ram assembly, a hopper assembly, an injection seat assembly;
the hydraulic motor is in transmission connection with the injection screw and is used for driving the injection screw to rotate;
the injection oil cylinder assembly is connected with the hydraulic motor and used for driving the hydraulic motor and the injection screw rod to do reciprocating motion along the axial direction of the injection screw rod;
the hopper assembly is arranged on the plasticizing assembly and is used for providing metal powder melt for injection for the charging barrel;
the hydraulic motor, the injection oil cylinder assembly and the plasticizing assembly are movably arranged on the injection seat assembly, and the injection seat assembly is fixedly arranged on the frame.
3. The injection molding machine for injecting molten metal powder as claimed in claim 2, wherein said injection seat assembly includes an injection seat and a plurality of slide assemblies disposed on said injection seat, said slide assemblies being reciprocally movable along an axial direction of said injection screw, said hydraulic motor, said injection ram assembly and said plasticizing assembly being disposed on said slide assemblies.
4. The injection molding machine for injecting metal powder melt according to claim 3, wherein the plasticizing assembly further comprises a fixing base, the fixing base is fixedly arranged on the sliding assembly, the charging barrel is detachably arranged on the fixing base, the injection screw is movably arranged on the fixing base in a penetrating manner, the hopper assembly is detachably arranged on the fixing base, a feeding channel is correspondingly arranged on the fixing base and used for communicating the hopper assembly and a feeding port of the charging barrel, a hydraulic rod is arranged on the fixing base, and a movable end of the hydraulic rod is connected with a fixed die plate of the die clamping system and used for controlling a jet nozzle of the charging barrel to be tightly connected with a feeding port of the die clamping system.
5. The injection molding machine for injecting molten metal powder according to claim 4, wherein said injection cylinder assembly comprises an injection cylinder, a fixed end of said injection cylinder is disposed on said fixed base, and a movable end of said injection cylinder is connected to said hydraulic motor for driving said hydraulic motor to reciprocate said injection screw on said injection base in an axial direction of said injection screw.
6. The injection molding machine for metal powder melt injection of claim 2, wherein the control system comprises a plurality of hydraulic pumps and a control terminal, wherein a plurality of hydraulic pumps are connected to the control terminal, and wherein the hydraulic pumps are connected to the hydraulic motor, the injection ram assembly, and the control terminal of the clamping system, respectively.
7. The injection molding machine for molten metal injection of claim 1 wherein said control system controls said injection screw to make a forward, pause, and forward rotating pulse rotation in said barrel during injection.
8. The injection molding machine for molten metal injection of claim 7 wherein the time interval between forward rotation and pause of the injection screw is in the range of 0.02-1s.
9. The injection molding machine for metal powder melt injection of claim 1, wherein said control system controls the advancing, retracting, advancing pulse-like axial reciprocation of said injection screw in said barrel in its axial direction upon injection.
10. The injection molding machine for molten metal injection of claim 9 wherein said injection screw is advanced, retracted and advanced for a time interval in the range of 0.02-1s.
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| CN110480965B (en) * | 2019-08-26 | 2021-11-12 | 方杰 | Screw pushing type injection molding machine for metal powder melt injection |
| CN112427640A (en) * | 2020-11-04 | 2021-03-02 | 东莞华晶粉末冶金有限公司 | Metal powder injection molding equipment and method |
| CN113815183A (en) * | 2021-11-23 | 2021-12-21 | 广东台进智能装备股份有限公司 | Unordered colour mixture injection equipment |
| CN114515832A (en) * | 2022-02-09 | 2022-05-20 | 杭州科技职业技术学院 | Integrated equipment for metal powder injection molding production |
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