CN106862521B - Semi-solid slurry pulping head - Google Patents
Semi-solid slurry pulping head Download PDFInfo
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- CN106862521B CN106862521B CN201710265194.1A CN201710265194A CN106862521B CN 106862521 B CN106862521 B CN 106862521B CN 201710265194 A CN201710265194 A CN 201710265194A CN 106862521 B CN106862521 B CN 106862521B
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- pulping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/007—Semi-solid pressure die casting
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Abstract
The invention discloses a semi-solid slurry pulping head, which comprises a pulping rod inserted into slurry to be prepared and a connecting seat arranged at the top of the pulping rod, wherein a closed inner cavity is formed between the connecting seat and the pulping rod, micropores with air permeability are densely arranged on at least the lower rod body of the pulping rod, and a medium inlet communicated with the closed inner cavity is also arranged on the connecting seat or the upper part of the pulping rod. When the pulping is in work, the inert gas is continuously introduced into the closed inner cavity, so that the inert gas permeates into the slurry solution through the micropores densely distributed on the pulping rod and is subjected to violent collision reaction and heat exchange with the slurry solution, the effects of deslagging, degassing, refining the internal crystal structure of the material and heat exchange can be achieved, the internal temperature of the slurry is uniform, the internal crystal structure is more uniform, the metallographic structure of a product obtained by die-casting the prepared slurry is more uniform, the pulping time can be obviously shortened, and the method is particularly suitable for semi-solid pulping of aluminum alloy, magnesium alloy and aluminum-magnesium alloy solutions.
Description
Technical Field
The invention relates to a semi-solid slurry pulping head.
Background
The semi-solid metal forming technology is a metal forming technology between solid forming and liquid forming, has the advantages of low liquid forming flow stress, high forming speed and capability of forming parts with complex shapes, and is widely concerned and researched by the fields of academia, manufacturing industry and the like at present. The most critical technology in the semi-solid metal forming technology is how to prepare semi-solid slurry with excellent performance.
at present, a method commonly adopted in the preparation process of the semi-solid slurry is that a mechanical stirring rod is adopted for stirring, and then the stirring rod is cooled or solid materials of the same material are added. The pulping mode has the defects of quick abrasion of a stirring rod, high cost, long stirring time, long cooling time and the like, influences the production rhythm and efficiency, has the defects of uneven temperature, uneven crystal structure and the like of the treated molten metal, and seriously influences the production cost, the production efficiency and the product quality.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a semi-solid slurry pulping head with a novel pulping mode.
In order to achieve the purpose, the invention adopts the technical scheme that: the semi-solid slurry pulping head comprises a pulping rod inserted into slurry to be prepared and a connecting seat arranged at the top of the pulping rod, wherein a closed inner cavity is formed between the connecting seat and the pulping rod, micropores with a ventilation function are densely distributed on at least the lower rod body of the pulping rod, and a medium inlet communicated with the closed inner cavity is further formed in the connecting seat or the upper part of the pulping rod.
Preferably, the pulping rod comprises a connecting rod part connected with the connecting seat and a pulping rod part positioned below the connecting rod part, and the micropores are densely arranged on the pulping rod part.
further, the pulping rod part is made of ceramic, graphite, silicon nitride, silicon carbide materials or stainless steel materials.
preferably, the lower part of the pulping rod is also fixedly provided with a stirring impeller.
preferably, the pulping head further comprises a guide pipe fixedly arranged in the closed inner cavity, the upper part of the guide pipe is connected with the medium inlet, and the guide pipe extends downwards into the lower part of the closed inner cavity.
Furthermore, the medium inlet is arranged on the connecting seat, and the upper part of the flow guide pipe is fixedly connected to the connecting seat and connected with the medium inlet.
preferably, the medium inlet is provided with a control valve for selectively introducing a medium, and the upper part of the pulping rod or the connecting seat is also provided with a medium outlet communicated with the closed inner cavity.
Preferably, the upper part of the pulping rod is fixedly arranged relative to the coupling seat, or the pulping rod can be rotatably connected to the coupling seat around the axis line of the pulping rod.
Preferably, the pulping head further comprises a cooling ring, the cooling ring is fixedly sleeved on the outer side of the connecting seat or the outer side of the upper part of the pulping rod, and an annular air blowing hole used for blowing air and cooling the peripheral wall of the outer side of the pulping rod is formed in the cooling ring.
Furthermore, the cooling ring is sleeved on the outer side of the upper part of the pulping rod and fixedly positioned below the connecting seat, and the air outlet of the annular air blowing hole faces to the peripheral wall of the outer side of the pulping rod.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: when the semi-solid slurry pulping head is adopted to carry out pulping work, inert gas such as nitrogen is continuously introduced into a closed inner cavity of the pulping head, so that the inert gas permeates into slurry solution through micropores densely distributed on a pulping rod, the inert gas and the slurry solution generate violent collision reaction and rapidly take away heat, and the metal solution is quenched, thereby achieving the effects of slag discharge, degassing, refining, changing the crystal structure in the material and heat exchange, ensuring that the temperature in the slurry is uniform and the crystal structure in the slurry is more uniform, ensuring that the metallographic structure of a product obtained after the prepared slurry is subjected to die casting is more uniform, and obviously shortening the pulping time.
Drawings
FIG. 1 is a schematic structural view of a pulping head of the present embodiment;
FIG. 2 is a top view of the agitator impeller on the slurrying head of FIG. 1;
FIG. 3 is a schematic view of the slurrying head of FIG. 1 after a cooling medium is introduced into the cooling ring;
FIG. 4 is a schematic view of the overall structure of the pulper of the embodiment;
FIG. 5 is a gold phase diagram of an aluminum alloy solution before pulping operation of a pulping head;
FIG. 6 is a metallographic graph of an aluminum alloy solution after pulping by using the pulping head of the embodiment;
Wherein: 10. pulping head; 1. a coupling seat; 11. a media inlet; 12. a media outlet; 2. pulping rod; 21. a connecting rod part; 22. a pulping rod part; 22a, an impeller mounting portion; 3. a flow guide pipe; 4. a stirring impeller; 41. a blade; 5. a cooling ring; 51. an annular air blowing hole; 52. a blowing medium inlet; 6. a temperature sensor; 20. a machine base; 201. a base; 202. a column; 203. a beam, 204, a support; 205. an adjusting seat; 206. a first hand wheel; 207. a second hand wheel; 30. a support; 40. a rotary motor (rotary drive member); 50. an air control system; 60. a soup container.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.
Referring to fig. 1 and 3, a pulping head 10 for semi-solid pulp pulping, which comprises a pulping rod 2 inserted into the pulp to be prepared and a connecting seat 1 arranged on the top of the pulping rod 2, wherein a closed inner cavity is formed between the connecting seat 1 and the pulping rod 2. Specifically, the pulping rod 2 is provided with a hollow inner cavity with an upward opening, and the connecting seat 1 is arranged at the top of the pulping rod 2 and closes the opening of the pulping rod so that a closed inner cavity is formed between the connecting seat 1 and the pulping rod 2.
At least the lower rod body of the pulping rod 2 is densely provided with micropores with air permeability, the pore diameter of the micropores is between 0.5 and 25 mu m, and the porosity is 45 to 55 percent, so that inert gas with certain pressure introduced into the closed inner cavity can overflow through the micropores, and therefore, when the pulping head 10 is inserted into the pulp to be prepared for pulping, and the inert gas is introduced into the closed inner cavity, the inert gas can uniformly permeate into the pulp solution through the micropores on the pulping rod 2 to generate violent collision reaction with the pulp solution and rapidly take away heat, so that the metal solution is rapidly cooled, and the effects of slag discharge, degassing, refining, changing the crystal structure in the material and heat exchange are achieved.
Referring to fig. 1 and 3, in the present embodiment, the pulping rod 2 includes a connecting rod portion 21 connected to the connecting seat 1, and a pulping rod portion 22 located below the connecting rod portion 21, and the pulping rod portion 22 is densely provided with the above-mentioned microporous structure. Specifically, the slurry rod 22 can be made of ceramic, graphite, silicon nitride or silicon carbide, stainless steel, etc., and when the slurry rod 22 is made of the above materials, the gaps between the molecules form a dense capillary micro-porous structure, so that the slurry rod 22 has a ventilation function.
The connecting shaft 21 is made of a gas-impermeable material, so that the loss of inert gas introduced during the pulping process is reduced. Of course, in some arrangements, the whole pulping rod 2 can be made into a rod body with capillary micropore structure.
referring to fig. 1 and 3, a medium inlet 11 and a medium outlet 12 which are communicated with the closed inner cavity are further formed on the connecting seat 1 or the upper part of the pulping rod 2, wherein the medium inlet 11 and the medium outlet 12 are both formed on the connecting seat 1.
the medium inlet 11 is connected with an inert gas source and a cooling medium source through an electromagnetic control valve, and the inert gas or the cooling medium can be selectively introduced into the closed inner cavity of the pulping head 10 through the switching of the working state of the electromagnetic control valve; the medium outlet 12 may be opened or closed. When the pulping head 10 is used for pulping, the medium outlet 12 is closed, and the medium outlet 11 is communicated with an inert gas source so as to continuously supply inert gas into the closed inner cavity; when the pulping head 10 finishes pulping, the medium outlet 12 is opened and the medium inlet 11 is communicated with a cooling medium source, preferably compressed air, to supply cooling medium into the closed inner cavity so as to quickly exchange heat with the closed inner cavity, so that the pulping head 10 is quickly cooled.
Referring to fig. 1 and 3, the pulping head 10 further comprises a draft tube 3 fixedly arranged in the closed inner cavity, the upper part of the draft tube 3 is fixedly connected to the connecting seat 1 and is connected with the medium inlet 11, the draft tube 3 extends downwards into the lower part of the closed inner cavity, so that when inert gas or other media are introduced into the medium inlet 11, the introduced media can flow into the lower part of the pulping rod 2 through the draft tube 3, and the introduced media are rapidly and uniformly distributed in the closed inner cavity.
The pulping head 10 can be simultaneously stirred when inserted into the slurry to be prepared for pulping, so that the temperature and the crystal structure inside the slurry solution to be prepared are more uniformly distributed. Referring to fig. 1 and 3, the pulping head 10 further includes a stirring impeller 4 fixedly disposed at a lower portion of the pulping rod 2, and a plurality of blades 41 are disposed on an outer peripheral portion of the stirring impeller 4 at regular intervals, as shown in fig. 2. The lower part of the pulping rod part 22 of the pulping rod 2 is also provided with an annular impeller mounting part 22a for mounting the stirring impeller 4.
The pulping head 10 further comprises a cooling ring 5, the cooling ring 5 is fixedly sleeved on the outer side of the coupling seat 1 or the outer side of the upper portion of the pulping rod 2, an annular air blowing hole 51 for performing air blowing cooling on the outer side peripheral wall of the pulping rod 2 and an air blowing medium inlet 52 communicated with the annular air blowing hole 51 are formed in the cooling ring 5, in the embodiment, as shown in fig. 1 and 3, the cooling ring 5 is sleeved on the outer side of the upper portion of the pulping rod 2 and is fixedly located below the coupling seat 1, and an air outlet of the annular air blowing hole 51 faces the outer side peripheral wall of the pulping rod 2. Thus, after the pulping head 10 finishes pulping, the annular blowing hole 51 can be filled with high-pressure cold air to clean and rapidly cool the peripheral wall of the pulping rod 2.
The pulping head 10 is further provided with a temperature sensor 6 for detecting the ambient temperature in the closed inner cavity, so that the ambient temperature in the closed inner cavity of the pulping head 10 is controlled within a set temperature range.
Referring to fig. 4, the pulping machine includes a base 20, a bracket 30 disposed on the base 20, and a pulping head 10 mounted on the bracket 30 for pulping. The pulping head 10 can be relatively fixedly arranged on the bracket 30, and also can be relatively swung or rotatably arranged on the bracket 30 around the axis line of the pulping head so as to simultaneously stir in the pulping process.
in the present embodiment, referring to fig. 4, the pulping head 10 is rotatably disposed on the bracket 30 around its own axis, and the pulping head 10 further comprises a rotary driving member for driving the pulping head 10 to rotate around its own axis, wherein the rotary driving member is a variable frequency motor 40 disposed on the bracket 30, which can control the pulping head 10 to rotate and stir at a preset rotation speed according to the requirement. In other certain embodiments, the upper part of the pulping rod 2 and the connecting seat 1 can be in dynamic sealing connection, and then the pulping rod 2 is directly driven to rotate by the rotary driving piece, so that the stirring operation can also be realized.
Referring to fig. 4, the base 20 of the present embodiment includes a base 201, a vertical column 202 erected upward from the base 201 and capable of adjusting height, a cross beam 203 disposed at an upper portion of the vertical column 202 through an adjusting seat 205 and extending in a horizontal direction, and a support 204 fixedly disposed at one end of the cross beam 203, and the base 20 further includes a first hand wheel 206 for adjusting the height of the vertical column 202, a second hand wheel 207 for adjusting the horizontal position of the cross beam 203, and a third hand wheel (not shown) for adjusting a rotation angle of the cross beam 203 relative to the vertical column 202.
The support 30 is arranged on the support 204 in a lifting manner along the vertical direction, and a lifting driving mechanism is arranged between the support 30 and the support 204. Specifically, the support 204 is provided with a guide rail (not shown in the figure) extending in the up-down direction to provide sliding guidance for the support 30 up and down, and the lifting driving mechanism adopts a screw-nut driving mechanism arranged between the support 204 and the support 30, so that the precise lifting of the pulping head 10 can be realized. Specifically, the nut may be fixed on the bracket 30, the screw may be rotatably disposed on the support 204 around its own axis, and the nut may be linearly moved along the screw by driving the screw to rotate by the motor, so that the bracket 30 is lifted up and down relative to the support 204. In the specific arrangement, the bracket 30 may be configured to have an L-shaped structure with a horizontal plate portion and a vertical plate portion, and the connecting seat 1 of the pulping head 10 is installed at the bottom of the horizontal plate portion, and the vertical plate portion is connected with the support 204 in a relatively sliding manner. Of course, the lifting driving mechanism may be configured by a cylinder, a rack and pinion, or the like.
In this embodiment, the pulper further comprises a first gas source device for supplying low-temperature inert gas, preferably nitrogen or argon, to the medium inlet 11, and a second gas source device for supplying low-temperature compressed air for heat exchange to the medium inlet 11. An air control system 50 is further provided on the housing 20 to control the open/close state, the air supply state, and the air supply state of the medium inlet 11, the medium outlet 12, and the air supply state of the blowing medium inlet 52, etc.
the following takes semi-solid casting slurry of aluminum alloy as an example to illustrate the specific working process of the embodiment:
referring to fig. 4, after the soup container 60 is filled with aluminum alloy slurry, the soup container is moved to the position below the pulping head 10, the pulping machine is started, the air control system 50 is operated to fill nitrogen with a certain pressure in the closed inner cavity of the pulping head 10, and then the bracket 30 is driven to descend along the support 204 to insert the lower portion of the pulping head 10 into the aluminum alloy solution in the soup container 60. In the pulping process, the first gas source device continuously introduces low-temperature nitrogen into the closed inner cavity, and the variable frequency motor 40 drives the pulping head 10 to rotate around the axis of the pulping head so as to stir the aluminum alloy solution. The nitrogen introduced into the closed inner cavity can uniformly permeate into the slurry solution through the micropores on the rod body of the pulping rod 2, so that a plurality of micro bubbles are generated in the slurry to have a violent collision reaction with the aluminum alloy solution and quickly take away heat, and the metal solution is quenched, so that the internal crystal structure of the slurry solution in the soup container 60 is changed from a dendritic crystal structure (dendritic crystal structure) to a granular spherical crystal structure (non-dendritic crystal structure), as shown in fig. 5 and 6, the mechanical strength, the elongation and other comprehensive mechanical properties of the material structure are improved, and the purpose of pulping is finally achieved. Meanwhile, the violent stirring operation of the pulping rod 2 in the pulping process can further shear and break all dendritic crystal tissue structures of the pulp, so that a tissue structure of spherical primary grains is formed, inert gas can be further uniformly mixed in the pulp, the tissue structure and the temperature of spherical crystals in the pulp solution are more uniform, the temperature of the pulp can be rapidly reduced, the pulping time can be greatly shortened, and the performance of the prepared pulp is more ideal.
After pulping is completed, the support 30 rises to enable the pulping head 10 to be lifted from the pulp, then cooling gas is introduced into the cooling ring 5 to enable the outer wall of the pulping head 10 to be rapidly cooled, meanwhile, the medium outlet 12 is opened and compressed air is introduced into the medium inlet 11 to rapidly exchange heat for the closed inner cavity of the pulping head 10, and therefore the whole pulping head 10 can be rapidly cooled. The slurry in the soup container 60 is sent to a die casting machine for die casting.
Taking a case product with an aluminum alloy brand of 375-T6 as an example, the pulping head and the pulping method of the embodiment are adopted to perform semi-solid forming, the tensile strength of the obtained product is more than or equal to 260MPa, the yield strength of the product is more than or equal to 214MPa, the elongation of the product can reach more than 8.2%, the service life of a die is 100000 times, the electric energy consumption for heat preservation of the metal solution in the forming process is only 11 KW/h, and the cutting processing amount of the formed product during processing is only about 0.13 kg.
and by adopting a conventional die-casting forming mode, the tensile strength of the obtained product can only reach 189 MPa, the yield strength is 148MPa, the elongation is 2.6%, the service life of a die is only 60000 times, the power consumption for heat preservation of the metal solution is only 22KW/h in the forming process, and the cutting processing amount of the formed product during processing reaches over 0.48 kg.
It can be seen that the semi-solid die-casting adopted in the embodiment has the following advantages:
(1) The forming is convenient and the forming speed is high;
(2) The slurry does not splash during molding, the compactness is improved, and the air doping is reduced;
(3) no macrosegregation exists, and the comprehensive mechanical property of the material is improved;
(4) The heat preservation temperature of the metal solution is low, so that the energy is saved;
(5) The addition phase can be conveniently added in the forming process;
(6) High automation is convenient to realize, and the productivity is improved;
(7) The environment is improved, and the operation is safe;
(8) The quality and the reliability of a formed piece are obviously improved;
(9) The semi-solid die cast parts may be heat treated (T5, T6);
(10) the semisolid forming stress is obviously reduced, the thermal shock to a forming die is greatly reduced, and the service life of the die is prolonged;
(11) The forming precision is high, the processing amount of the part blank is greatly reduced, and the cost is reduced.
in conclusion, when the semi-solid slurry pulping head provided by the invention works in pulping, inert gas such as nitrogen is continuously introduced into the closed inner cavity of the pulping head 10, so that the inert gas permeates into the slurry solution through the micropores densely distributed on the pulping rod 2 and is subjected to violent collision reaction and heat exchange with the slurry solution, thereby achieving the effects of slag discharge, degassing, material internal crystal structure refinement and heat exchange, enabling the internal temperature of the slurry to be uniform and the internal crystal structure to be more uniform, and enabling the metallographic structure of a product obtained after the prepared slurry is subjected to die casting to be more uniform.
The pulping head 10 has a simple structure, is convenient to operate, can realize automatic control in the pulping process when being installed on a pulping machine for pulping, has the multiple advantages of short process, high speed, less peripheral matched equipment, low energy consumption and the like, and is particularly suitable for semi-solid pulping of aluminum alloy, magnesium alloy and aluminum-magnesium alloy solution.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (6)
1. A semi-solid slurry pulping head is characterized in that: the pulping head comprises a pulping rod inserted into the pulp to be prepared and a connecting seat arranged at the top of the pulping rod, a closed inner cavity is formed between the connecting seat and the pulping rod, micropores with air permeability are densely arranged on at least the lower rod body of the pulping rod, a medium inlet communicated with the closed inner cavity is further arranged on the connecting seat or the upper part of the pulping rod, the pulping rod comprises a connecting rod part connected with the connecting seat and a pulping rod part positioned below the connecting rod part, the micropores are densely arranged on the pulping rod part, the pulping rod part comprises a rod main part connected with the connecting rod part and an annular convex part positioned below the rod main part, the outer diameter of the rod main part is the same as that of the connecting rod part, and the pulping rod further comprises a stirring impeller fixedly arranged on the annular convex part, the pulping head also comprises a guide pipe fixedly arranged in the closed inner cavity, the upper part of the guide pipe is connected with the medium inlet, and the guide pipe extends downwards into the lower part of the closed inner cavity; the pulping head further comprises a cooling ring, the cooling ring is fixedly sleeved on the outer side of the connecting seat or the outer side of the upper part of the pulping rod, and an annular air blowing hole used for blowing and cooling the peripheral wall of the outer side of the pulping rod is formed in the cooling ring.
2. The semi-solid slurry slurrying head of claim 1, wherein: the pulping rod part is made of ceramic, graphite, silicon nitride, silicon carbide materials or stainless steel materials.
3. The semi-solid slurry slurrying head of claim 1, wherein: the medium inlet is arranged on the connecting seat, and the upper part of the flow guide pipe is fixedly connected on the connecting seat and connected with the medium inlet.
4. The semi-solid slurry slurrying head of claim 1, wherein: the medium inlet is provided with a control valve for selectively introducing a medium, and the upper part of the pulping rod or the connecting seat is also provided with a medium outlet communicated with the closed inner cavity.
5. the semi-solid slurry slurrying head of claim 1, wherein: the upper part of the pulping rod and the connecting seat are relatively fixedly arranged, or the pulping rod can be rotatably connected to the connecting seat around the axis of the pulping rod.
6. The semi-solid slurry slurrying head of claim 1, wherein: the cooling ring is sleeved on the outer side of the upper part of the pulping rod and fixedly positioned below the connecting seat, and the air outlet of the annular air blowing hole faces to the peripheral wall of the outer side of the pulping rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710265194.1A CN106862521B (en) | 2017-04-21 | 2017-04-21 | Semi-solid slurry pulping head |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710265194.1A CN106862521B (en) | 2017-04-21 | 2017-04-21 | Semi-solid slurry pulping head |
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| CN106862521A CN106862521A (en) | 2017-06-20 |
| CN106862521B true CN106862521B (en) | 2019-12-13 |
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| CN206622589U (en) * | 2017-04-21 | 2017-11-10 | 苏州金澄精密铸造有限公司 | A kind of semi solid slurry slurrying head |
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| US9574826B2 (en) * | 2012-09-27 | 2017-02-21 | Ajax Tocco Magnethermic Corporation | Crucible and dual frequency control method for semi-liquid metal processing |
| CN105149549B (en) * | 2015-09-21 | 2017-04-19 | 珠海市润星泰电器有限公司 | Device and method for preparing semi-solid sizing agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1480275A (en) * | 2003-08-08 | 2004-03-10 | 北京交通大学 | Method and equipment for preparing semisolid fused mass of ferrous material |
| CN101875105A (en) * | 2009-11-21 | 2010-11-03 | 华中科技大学 | Preparation method and device of semi-solid slurry |
| CN105268933A (en) * | 2015-12-02 | 2016-01-27 | 珠海市润星泰电器有限公司 | Method and device for preparing semi-solid slurry |
| CN105537540A (en) * | 2016-01-04 | 2016-05-04 | 中兴通讯股份有限公司 | Preparation method and preparation equipment for semi-solid slurry |
| CN206622589U (en) * | 2017-04-21 | 2017-11-10 | 苏州金澄精密铸造有限公司 | A kind of semi solid slurry slurrying head |
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