CN113695518B - Die and casting method for scraper knife of vertical shaft planetary concrete mixer - Google Patents
Die and casting method for scraper knife of vertical shaft planetary concrete mixer Download PDFInfo
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- CN113695518B CN113695518B CN202110842435.0A CN202110842435A CN113695518B CN 113695518 B CN113695518 B CN 113695518B CN 202110842435 A CN202110842435 A CN 202110842435A CN 113695518 B CN113695518 B CN 113695518B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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Abstract
The invention discloses a die and a casting method for a shovel blade of a vertical shaft planetary concrete mixer, and belongs to the field of casting processing. The invention adopts reasonable mould design, so that the scraper knife with larger size and more complex structure can be suitable for the modeling production of the dike sand line. The invention also provides a casting method by using the Disha line die. Aiming at the problems that the casting quality and production batch of common sand molds, lost foam castings and sand-coated shell molds in the prior art are difficult to meet the requirements, the rejection rate is high, the production cost is high and the like, the scraper knife produced by casting by using the method has the advantages of high dimensional precision, high surface smoothness, high production efficiency, stable quality, low consumption of molding sand, low production cost and the like, and has important significance for the casting production of the scraper knife.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a mold and a casting method for a shovel blade of a vertical shaft planetary concrete mixer.
Background
A vertical shaft planetary concrete mixer scraper knife is an important wear-resistant part arranged on a vertical shaft planetary concrete mixer, has a complex structure, has an L-shaped overall shape and is divided into a knife bar and a scraper blade; the cutter bar part is provided with a mounting hole, a mounting surface groove and a limiting rib; the bottom of the scraper is provided with a reinforcing rib, and the reinforcing rib is connected with a limiting rib; the outline dimension is 310mm multiplied by 180mm multiplied by 215mm; the scraper knife is made of high-chromium cast iron BTMCr20, and the surface hardness requirement is HRC 58-62; because it is installed on the stirring tool which is used for planetary operation of the vertical shaft planetary concrete mixer, the higher dimensional precision and surface smoothness are required; the stirring tools of the vertical shaft planetary concrete mixer generally have a plurality of groups, so each planetary motion unit has higher dynamic balance requirement, and the quality error of the scraper knife is required to be in a small interval.
The casting production process of the scraper knife mainly comprises common sand casting, lost foam casting, precoated sand shell casting and the like. The common sand casting has poor product precision and low production efficiency, so that the product cannot meet the requirements of batch production, dimensional precision and surface finish. The lost foam casting product has high dimensional accuracy and high production efficiency, but as the foam mold piece needs to be burnt off during casting, the casting temperature is higher, the internal structure crystal grains of the product are coarse, the product has poor wear resistance and short service life; and the pouring temperature interval is large, turbulence is easy to occur during pouring, so that the sequential solidification field is not easy to establish, the error of the internal compactness degree of the product is large, and the quality error is also large. The sand-lined shell mold casting has the advantages of high dimensional precision and high surface smoothness, but needs to be cast after various cores are manufactured, is relatively complicated in production process, low in production efficiency, incapable of meeting the requirements of mass production, difficult in recycling of used sand and relatively high in production cost.
The prior production process of the scraper knife generally adopts common sand casting and lost foam casting, the product quality and the production batch are difficult to meet the requirements, and the rejection rate is high. The sand-lined shell mold casting has high production cost, low production efficiency and very low popularization rate, and can not meet the requirement of mass production.
The product cast by the Disha molding line has high dimensional precision and surface smoothness, high automation degree and production efficiency, can produce 400-800 parts per hour, has convenient and efficient recycling of used sand, good economy and compact internal structure of the product, and is an ideal production process for producing high-chromium cast iron wear-resistant castings.
Therefore, the casting of the shovel blade by the Disha line is a proper choice, but at present, no mature process precedent for casting the shovel blade by the Disha line exists, and no experience or case can be used for reference.
If the shovel blade is produced by casting with a Disha moulding line, the following inconveniences exist:
(1) Due to the particularity of the molding of the died sand, the design of the die must ensure smooth die drawing, and no sand digging operation and loose piece stripping are available, the structure of the scraper knife is complex, the overall shape is in an L shape, and the die has structures such as mounting surface grooves, mounting holes, limiting ribs, reinforcing ribs and the like, so that the difficulty of smooth die drawing is ensured by the design of the die;
(2) Due to the particularity of the molding of the diutan, the mold design should reduce or avoid the operation of removing the sand core as much as possible, because the operation of removing the sand core can greatly reduce the production efficiency, the structure of the scraper knife is more complex, the overall shape is L-shaped, and the scraper knife is provided with structures such as a mounting surface groove, a mounting hole, a limiting rib, a reinforcing rib and the like, and the difficulty of the operation of removing the sand core is reduced or avoided;
(3) Due to the particularity of the molding of the died sand, the die is required to be designed into a positive pressure plate die and a negative pressure plate die which are matched for use, the height of the negative pressure plate die is limited to a certain extent, the size of the scraper knife is large, and the die is designed to avoid the height of the negative pressure plate die from exceeding the limit;
(4) Because the quality error of the scraper knife is required to be within a very small interval, the design of the mould must ensure that a sprue and a riser can be reasonably designed, a reasonable sequential solidification temperature field is established, and a casting with good feeding and compact internal structure is obtained;
(5) The scraper knife has the requirements of higher dimensional accuracy, surface smoothness, surface hardness, quality error and the like, and a reasonable molding sand process, a pouring system, a riser and a pouring process must be formulated to ensure that the product quality meets the requirements.
Therefore, the scraper knife is reasonably designed, so that the scraper knife can be smoothly pulled out, the operation of removing a mud core is reduced or not needed, the size specification of the scraper knife is not overproof, the scraper knife is suitable for the production of a dinas moulding line, a reasonable casting method is formulated, and the qualified scraper knife with high size precision and high surface finish degree can be produced at high efficiency and low cost, thereby having important significance for the casting production of the scraper knife.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the problems that the casting quality and production batch of common sand molds, lost foam castings, sand-coated shell molds are difficult to meet requirements, the rejection rate is high, the production cost is high and the like in the prior art, the invention provides the mold and the casting method of the scraper knife of the vertical shaft planetary concrete mixer.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a die of a vertical shaft planetary concrete mixer scraper knife, which comprises a positive pressure plate die, wherein the positive pressure plate die comprises a positive seat plate, a groove area which is downwards sunken and is arranged on the working surface of the positive seat plate is a cutter bar part tap core, and a scraper part sand tire which is upwards protruded; the upper part of the molding surface is provided with an upper left riser, and the left side and the right side of the molding surface are respectively provided with an ingate easy-cutting groove and a lower riser easy-cutting groove; a cross pouring channel protruding upwards is further arranged on the side edge of the lower riser knock-off groove; a left pouring cup protruding upwards is arranged on one side of the upper part of the stem of the cutter.
Furthermore, the device also comprises a counter-pressure plate mould which comprises a counter-pressure plate, wherein the working surface of the counter-pressure plate is provided with a cutter bar part sand tyre which protrudes upwards and a scraper part self-feeding core which is sunken downwards, the scraper part self-feeding core is positioned below the cutter bar part sand tyre, the cutter bar part sand tyre is also provided with two side plate-shaped protruding sand tyres which correspond to the scraper structure, and a mounting surface groove self-feeding core which is sunken downwards is arranged between the two side plate-shaped protruding sand tyres; the upper part of the sand tire at the cutter bar part is provided with an upper right riser which protrudes upwards, one side of the sand tire at the cutter bar part is provided with a lower riser which protrudes upwards, and the other side of the sand tire at the cutter bar part is provided with a right sprue cup and a sprue which protrude upwards and extend downwards from top to bottom.
Furthermore, an upper left riser easy-cutting groove is formed between the upper left riser on the positive seat plate and the molding surface below the upper left riser.
Furthermore, an inner sprue is also arranged on one side of the sand tire at the cutter bar part, which is close to the sprue, and an inner sprue easily-cut slope surface is arranged between the inner sprue and the plate-shaped protruding sand tire at the single side of the sand tire at the cutter bar part; a lower riser easy-cutting slope is arranged between the lower riser and the plate-shaped protruding sand tire on the other side of the sand tire on the cutter bar.
Further, the cross-sectional area ratio of the sprue, runner and ingate was 1.0:1.2:1.2.
furthermore, an upper exhaust groove is arranged above the upper right riser, and a lower exhaust groove is arranged above the lower riser.
Furthermore, the easy cutting groove is a groove with a certain depth and a certain included angle between the inclined slope surfaces at the two sides, and the opening of the groove is gradually reduced downwards; the easy-cutting slope surface is a chamfer surface with a certain width and a slope surface angle.
Furthermore, the front seat plate is also provided with a front mounting hole and a front positioning hole for mounting and positioning, the reverse seat plate is also provided with a reverse mounting hole and a reverse positioning hole, the working surface of the front seat plate is also provided with a front anti-collision rod, and the working surface of the reverse seat plate is correspondingly provided with a reverse anti-collision rod.
The invention relates to a casting method of a shovel blade of a vertical shaft planetary concrete mixer, which comprises the following steps:
s1, correspondingly installing the positive pressure plate die and the back pressure plate die on a positive pressure plate and a back pressure plate of a desanding molding machine respectively; preparing and conveying molding sand; then starting a desanding molding machine to start operation;
s2, smelting molten iron, and pouring by using a pouring machine, wherein the operation of a sand molding machine and the pouring operation are simultaneously carried out, the pouring temperature is 1400-1450 ℃, and the pouring time is 8-9 seconds;
s3, after the pouring is finished, automatically conveying the sand mold and the casting to a shakeout station by a system, and automatically shakeout; and then knocking off the pouring gate and the riser, taking out the casting, transferring to a cleaning station, and carrying out subsequent treatment.
Furthermore, the medium-sized sand of S1 comprises 4.0 to 5.0 percent of new sand, 0.5 to 1.0 percent of bentonite, 0.3 to 0.4 percent of coal powder, 3.0 to 3.5 percent of water and the balance of old sand; s2, smelting molten iron, wherein the molten iron comprises the following components in percentage by mass: 2.0 to 3.3 percent of C, less than or equal to 1.2 percent of Si, less than or equal to 2.0 percent of Mn, 18.0 to 23.0 percent of Cr18, less than or equal to 3.0 percent of Mo, less than or equal to 2.5 percent of Ni, less than or equal to 1.2 percent of Cu, less than or equal to 0.06 percent of P, less than or equal to 0.06 percent of S, and the balance of iron and inevitable impurities.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) The mould adopts the design of middle parting, tap cores, sand tires and the like, so that the scraper knife casting with larger size and more complex structure can be produced by casting with a Disha line, the production efficiency is high, and 450 scraper knife castings can be produced per hour; and because of adopting Disha line casting production, the size precision of the scraper knife casting product is higher, the size precision can reach CT 5-6 grade, accord with the design requirement; the surface smoothness of the scraper knife casting product is high, the surface roughness Ra value can reach 6.3-12.5 mu m, and the design requirement is met.
(2) According to the die, the easily-cut riser is adopted, so that the riser can be directly knocked off after shakeout on the premise of ensuring the feeding effect, the casting body is not damaged, the cleaning efficiency is greatly improved, and the production cost is saved; adopt and easily cut the runner, can be under the prerequisite of guaranteeing the pouring effect, can directly knock off the runner after the shakeout to do not hinder and reach the foundry goods body, greatly improve cleaning efficiency, practice thrift manufacturing cost.
(3) The casting method adopts Dietz line casting production and reasonable casting process design, the process parameters such as molding sand proportion, a gating system, a riser and the like are reasonably and stably arranged, the internal structure of the scraper knife casting is compact, the strength is high, the quality error is less than 0.5%, and the design requirement is met; and a large amount of used sand can be recycled, only a small amount of new sand, bentonite and coal powder are added, and the molding sand is low in cost; the produced sand mold can be directly used for pouring, so that the energy consumption is greatly reduced; the production automation degree is higher, the product quality is stable, and the product percent of pass is more than 99.5 percent.
Drawings
FIG. 1 is a schematic isometric side view of a vertical axis planetary concrete mixer blade according to the present invention;
FIG. 2 is a schematic front view of the positive platen mold according to the present invention;
FIG. 3 is a schematic isometric side view of the platen die of the present invention;
FIG. 4 is a schematic front view of the back-pressure plate mold of the present invention;
FIG. 5 is a schematic isometric side view of a back-pressure plate mold of the present invention;
FIG. 6 is a schematic isometric side view of a left sand casting cavity formed by the positive platen die of the present invention;
FIG. 7 is a schematic isometric side view of a right sand casting cavity formed by the counter-pressure plate mold of the present invention;
fig. 8 is a schematic isometric side view of a sand mold assembly according to the present invention.
The reference numerals in the schematic drawings illustrate:
11. a cutter bar; 12. a scraper; 13. mounting holes; 14. mounting surface grooves; 15. limiting ribs; 16. reinforcing ribs;
201. a seat plate; 202. a positive mounting hole; 203. positioning holes are corrected; 204. a positive crash bar; 205. a left pouring cup; 206. a cross gate; 207. the cutter bar part is a tap core; 208. a tap hole tap core; 209. a scraper part sand tire; 210. an upper left riser; 211. an upper left riser easy-cutting groove; 212. a lower riser is easy to cut; 213. the inner sprue is easy to cut;
205a, molding a left sprue cup; 206a, a sand mould cross gate; 207a, a core of a sand mold cutter rod part; 208a, a sand mould mounting hole tap core; 210a, a left riser at the upper part of the sand mould; 211a, a left riser easy-cutting groove in the upper part of the sand mould; 212a, easily cutting a riser groove at the lower part of the sand mold; 213a, a gate easy-cutting groove in the sand mold;
301. a reaction plate; 302. a reverse mounting hole; 303. reversely positioning the hole; 304. an anti-collision bar; 305. a right pouring cup; 306. a straight pouring channel; 307. an inner gate; 308. a sand tire at the cutter bar part; 309. the core of the scraper part; 310. mounting a grooved tap core; 311. an upper right riser; 312. a lower riser; 313. an upper exhaust groove; 314. a lower exhaust groove; 315. the upper right riser is easy to cut; 316. the inner sprue is easy to cut the slope; 317. the lower dead head is easy to cut a slope surface;
305a, molding a right sprue cup; 306a, a sand mould sprue; 311a, a sand mould upper right riser; 312a, a sand mould lower riser; 313a, an exhaust groove on the sand mold; 314a, a sand mold lower exhaust groove; 317a, easily cutting a slope surface of a riser at the lower part of the sand mould.
Detailed Description
For a further understanding of the invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be further described with reference to the following examples.
Example 1
Firstly, as shown in fig. 1, the final product to be processed scraper blade in this embodiment is an integrated structure design, and includes an upper cutter bar 11 and a lower scraper 12, the cutter bar 11 and the scraper 12 are connected by a connecting plate extending obliquely, a side surface of one side of the cutter bar 11 is an installation surface groove 14 with a circular arc-shaped cross section, two sides of the installation surface groove 14 are respectively provided with a limiting rib 15, the cutter bar 11 is further provided with two installation holes 13 along the longitudinal direction, in practice, the installation holes 13 and the limiting ribs 15 on the two sides are used for realizing the positioning installation of the scraper blade, wherein the limiting rib 15 is provided with a reinforcing rib 16 at a position where the limiting rib 15 extends downwards, and the reinforcing rib 16 extends from the bottom of the limiting rib 15 to the bottom of the scraper 12, thereby effectively enhancing the overall structural strength.
Correspondingly, the mold of the vertical shaft planetary concrete mixer scraper of the embodiment includes a positive pressure plate mold, as shown in fig. 2 and fig. 3, the positive pressure plate mold includes a positive seat plate 201, a recessed groove region provided on a working surface of the positive seat plate 201 and being a cutter bar position tap core 207, and a scraper position sand tire 209 protruding upward, the scraper position sand tire 209 is located below the cutter bar position tap core 207, and correspondingly, the scraper position sand tire 209 also includes a connecting plate position sand tire corresponding to a scraper connecting plate structure, which is not described herein again. A forming surface protruding upwards is further arranged in the recess of the tap core 207 at the cutter bar part, and a groove area recessed downwards is formed in the forming surface to form a tap core 208 of an installation hole; correspondingly, the mounting holes 208 are two longitudinally arranged; an upper left riser 210 is arranged on the upper part of the molding surface, and an upper left riser knock-off groove 211 is arranged between the upper left riser 210 and the molding surface below. The left side and the right side of the molding surface are respectively provided with an ingate easy-cutting groove 213 and a lower riser easy-cutting groove 212; a cross pouring gate 206 protruding upwards is further arranged on the side edge of the lower riser knock-off groove 212; a left pouring cup 205 protruding upwards is arranged on one side of the upper part of the stem 207. As shown in the orientation of fig. 3, a left pouring cup 205 is provided at the upper portion of the right side of the stem 207 in the shank portion, a runner 206 is provided below the left pouring cup 205, and the runner 206 extends inward from the face surface of the front seat plate 201 to the inside of the stem 207 in the shank portion.
As shown in fig. 4 and 5, the die further comprises a counter plate die, the counter plate die comprises a counter plate 301, the working surface of the counter plate 301 is provided with a cutter bar part sand tire 308 protruding upwards, the downward recessed groove area is a scraper part core 309, the scraper part core 309 is positioned below the cutter bar part sand tire 308, the cutter bar part sand tire 308 is further provided with two side plate-shaped protruding sand tires corresponding to the scraper structure, and a downward recessed mounting surface groove core 310 is arranged between the two side plate-shaped protruding sand tires; specifically, referring to fig. 5, it can be seen that the sand tire 308 at the cutter bar position is provided with a sand tire corresponding to the structure of the scraper, such as the limiting rib 15, the reinforcing rib 16, the connecting plate, the scraper 12, etc., wherein the sand tire corresponding to the scraper 12 position extends into the scraper position tap core 309, the plate-shaped protruding sand tires at the two sides are corresponding to the limiting rib 15 position, and the tap core 310 with the mounting surface groove is formed in the middle. Wherein, the upper part of the sand tire 308 at the cutter bar part is provided with an upper right riser 311 which protrudes upwards, and an upper exhaust groove 313 is arranged above the upper right riser 311; an upper right riser knock-off groove 315 is arranged between the bottom of the upper right riser 311 and the mounting surface groove tap core 310; the sand tire 308 at the cutter bar part is provided with a lower riser 312 protruding upwards on one side and a right pouring cup 305 and a sprue 306 protruding upwards and extending downwards from top on the other side. Wherein, a lower exhaust groove 314 is arranged above the lower riser 312, and a lower riser easy-cutting slope 317 is arranged between the lower riser 312 and the plate-shaped protruding sand tire on the sand tire 308 at the cutter bar part. An inner sprue 307 is arranged on one side of the sand tire 308 at the cutter bar part and close to the sprue 306, and an inner sprue easy-cutting slope surface 316 is arranged between the inner sprue 307 and the plate-shaped protruding sand tire on one side of the sand tire 308 at the cutter bar part. As shown in the orientation of fig. 5, a right sprue cup 305 and a sprue 306 are arranged on the upper part of the left side of the sand tire 308 of the cutter bar part, and an inner sprue 307 is arranged on the left side close to the plate-shaped protruding sand tire; the right side is provided with a lower riser 312. In the present embodiment, the cross-sectional area ratio of the sprue 306, runner 206, and ingate 307 is 1.0:1.2:1.2. the upper exhaust groove 313 and the lower exhaust groove 314 are both 30mm × 2mm in size.
It should be noted that, in the embodiments, the easy-cutting grooves at multiple positions are all grooves with certain included angles between inclined slopes on two sides, and with certain depths, the openings of which are gradually reduced downward; in this embodiment, the grooves have a depth of 5mm and an included angle of two slope surfaces of 90 degrees; the easy-cutting slope surface of the easy-cutting groove is a chamfer surface with certain width and slope surface angle, and chamfer surfaces with the width of 5mm and the slope surface angle of 45 degrees are adopted in the embodiment.
In this embodiment, the front seat plate 201 is further provided with a front mounting hole 202 and a front positioning hole 203 for mounting and positioning, the back seat plate 301 is also provided with a back mounting hole 302 and a back positioning hole 303, specifically, four mounting holes and 2 positioning holes are respectively provided, and the front and back pressing dies are respectively mounted and positioned on the front and back pressing plates of the desanding molding machine through the respective mounting holes and positioning holes. Two positive anti-collision rods 204 are arranged on the working surface of the positive seat plate 201, and two negative anti-collision rods 304 are correspondingly arranged on the working surface of the negative seat plate 301. The positive pressure plate die and the negative pressure plate die are both made of HT200 cast iron.
In the embodiment, the upper left riser 210 and the upper right riser 311 jointly form an upper whole riser of a casting; the upper left riser 210 and the upper left riser easy-cutting groove 211 act together, so that the thickness of the upper integral riser at the lowest position of the upper left riser easy-cutting groove 211 is the smallest, an included angle is formed, and the upper integral riser is easy to break at the position under the action of external force, so that the upper integral riser becomes the easy-cutting riser. Similarly, the lower riser split groove 212 and the lower riser split ramp 317 act together to minimize the thickness of the lower riser 312 at the lowest point of the lower riser split groove 212 and to provide a sharp angle at which the lower riser 312 is susceptible to fracture when subjected to external forces, thereby making the lower riser 312a split riser. Similarly, the inner gate easy-cutting groove 213 and the inner gate easy-cutting slope 316 act together, so that the thickness of the inner gate 307 at the lowest position of the inner gate easy-cutting groove 213 is the smallest, and the inner gate 307 has a sharp corner, and is easy to break at the position when being acted by external force, so that the inner gate 307 becomes the easy-cutting inner gate.
As shown in fig. 6, a schematic diagram of a sand left casting cavity structure formed by a positive pressure plate mold is shown; the corresponding structures such as a sand mold left sprue cup 205a, a sand mold cross gate 206a, a sand mold cutter bar part tap core 207a, a sand mold mounting hole tap core 208a, a sand mold upper part left riser 210a, a sand mold upper part left riser knock-off groove 211a, a sand mold lower riser knock-off groove 212a and a sand mold ingate knock-off groove 213a can be clearly seen; FIG. 7 is a schematic view of a right sand casting cavity structure formed by a counter-pressure plate mold; corresponding structures such as a sand mold right sprue cup 305a, a sand mold sprue 306a, a sand mold upper right riser 311a, a sand mold lower riser 312a, a sand mold upper exhaust groove 313a, a sand mold lower exhaust groove 314a, a sand mold lower riser easy-cutting slope 317a and the like can be clearly seen, and fig. 8 is a schematic structural diagram of a sand mold group.
Correspondingly, the casting method of the shovel blade of the vertical shaft planetary concrete mixer comprises the following steps:
s1, correspondingly installing the positive pressure plate die and the back pressure plate die on a positive pressure plate and a back pressure plate of a desanding molding machine respectively; preparing and conveying molding sand; then starting a desanding molding machine to start operation; manufacturing 1 sand mold by a Di sand molding machine every 8 seconds and automatically molding;
specifically, a sand scraping strip necessary for molding is arranged at the bottom of a positive pressure plate mold, the positive pressure plate mold is arranged and positioned on a positive pressure plate of a desanding molding machine through a positive mounting hole 202 and a positive positioning hole 203, and then a plastic blank cap is used for covering the positive positioning hole 203; installing a necessary sand scraping strip for molding at the bottom of a counter-pressure plate mold, installing and positioning the counter-pressure plate mold on a counter-pressure plate of a desanding molding machine through a counter-installation hole 302 and a counter-positioning hole 303, and covering the counter-positioning hole 303 by a plastic blank cap;
specifically, the molding sand comprises 4.0-5.0% of new sand, 0.5-1.0% of bentonite, 0.3-0.4% of coal powder, 3.0-3.5% of water and the balance of old sand; the used sand is recycled on the production line, the new sand, the bentonite, the coal powder and the water are respectively placed in each hopper, and the system automatically and accurately weighs, feeds, mixes and conveys the molding sand;
specifically, the process of starting the died sand molding machine to start operation comprises the steps of forming a closed molding chamber by a positive pressure plate mold, a negative pressure plate mold and the inner wall of the died sand molding machine, starting the died sand molding machine to eject sand to the molding chamber and extrude molding sand, then retreating the negative pressure plate mold, rotating for 90 degrees after completing automatic demolding, pushing a sand block to a conveying line by the died sand molding machine, retreating the positive pressure plate mold to complete automatic demolding, returning the positive pressure plate mold and the negative pressure plate mold to original positions to manufacture a first sand mold, forming a left casting cavity on one side of the sand mold by the positive pressure plate mold, and forming a right casting cavity on the other side of the sand mold by the negative pressure plate mold. And (3) manufacturing 1 sand mold every 8 seconds, after a second sand mold is manufactured, pushing the second sand mold onto a conveying line to be automatically combined with the first sand mold, forming a complete casting cavity by a right casting cavity of the second sand mold and a left casting cavity of the first sand mold, forming a complete casting cavity by a right casting cavity of the third sand mold and a left casting cavity of the second sand mold after a third sand mold is manufactured, and analogizing the process.
S2, smelting molten iron, and pouring by using a pouring machine, wherein the operation of a desanding molding machine and the pouring operation are simultaneously carried out, the pouring temperature is 1400-1450 ℃, and the pouring time is 8-9 seconds;
specifically, the molten iron comprises the following components in percentage by mass: 2.0 to 3.3 percent of C, less than or equal to 1.2 percent of Si, less than or equal to 2.0 percent of Mn, 18.0 to 23.0 percent of Cr18, less than or equal to 3.0 percent of Mo, less than or equal to 2.5 percent of Ni, less than or equal to 1.2 percent of Cu, less than or equal to 0.06 percent of P, less than or equal to 0.06 percent of S, and the balance of Fe and inevitable impurities;
s3, after pouring is finished, automatically conveying the sand mold and the casting to a shakeout station by the system, and automatically shakeout; and then knocking off the pouring gate and the dead head, taking out the casting, transferring to a cleaning station, carrying out subsequent treatment, polishing, carrying out shot blasting and inspection on the casting, transferring to a heat treatment station, and finishing casting.
In the embodiment, the position of the cutter bar 11 of the scraper knife is upward, the pouring position is arranged in the middle, and the middle parts of the top and the side are respectively provided with a riser feeding casting, so that a sequential solidification temperature field is favorably established, the riser feeding effect is favorably exerted, and the casting with full feeding and sound internal structure is easily obtained; the scheme of middle parting is adopted, namely the molding surface of the scraper knife is divided into two parts which are respectively positioned on the positive pressure plate mold and the negative pressure plate mold, so that the height of the negative pressure plate mold does not exceed the standard, and the sand tire and the tap core are favorably arranged; for the upper part of the scraper knife, because the middle parting is adopted, and the scheme of sand tire and tap core is adopted, the smooth stripping of the part can be ensured, and the operation of mud core discharging is also avoided; the molding of the scraper knife mounting hole 13 is obtained by adopting a tap core method, so that not only can smooth stripping be ensured, but also the operation of discharging a sand core is avoided; the position of the groove 14 on the mounting surface of the scraper knife is obtained by adopting a core-feeding method, so that smooth stripping can be ensured, and the operation of discharging a loam core is avoided; for the bottom of the scraper knife, the height is large, the reinforcing ribs 16 are arranged, and the sand tire and the tap core are arranged, so that the smooth stripping of the part can be ensured, and the mud core discharging operation is avoided.
This embodiment is all more complicated according to malleation matrix utensil and back pressure matrix utensil structure, all has more sand child and tap core to the degree of depth of sand child and tap core is great, and the reasonable molding sand technology is formulated to the big condition of performance parameter difference such as compacting rate, hardness, gas permeability everywhere of molding back sand mould. According to the structural characteristics of the scraper knife, a reasonable pouring system and a casting mold exhaust hole groove are made by combining the actual arrangement condition of each component of the mold; riser of high chromium cast iron, the runner is got rid of more difficultly, the material thermal conductivity is poor, it is easy to split to be heated, can not adopt gas cutting, hot-working excision such as carbon arc plane, the material hardness is higher also can not use the saw cutting, use turning, cold processing excision cost such as planing is higher and production efficiency is low, nevertheless this embodiment designs into the riser easily to cut the riser with the riser under the prerequisite of guaranteeing the feeding effect, design into the easily to cut the runner with the runner under the prerequisite of guaranteeing the pouring effect, directly knock off behind the shakeout, and do not injure the foundry goods body, greatly improve cleaning efficiency, practice thrift manufacturing cost.
The scraper knife with the large size and the complex structure can be produced by casting a Dietz line by adopting reasonable die design and casting process design, has the advantages of high size precision, high surface smoothness, high production efficiency, low molding sand consumption, low production cost, stable quality, high product percent of pass and the like, and has important significance for the casting production of the scraper knife.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (7)
1. The utility model provides a mould of planetary concrete mixer spiller of vertical scroll which characterized in that: the positive pressure plate die comprises a positive pressure plate die, wherein the positive pressure plate die comprises a positive seat plate (201), a groove area which is downwards sunken and is arranged on the working surface of the positive seat plate (201) is a cutter bar position tap core (207), and a scraper position sand tire (209) which is upwards protruded; an upper left riser (210) is arranged at the upper part of the molding surface, and an ingate easily-cut groove (213) and a lower riser easily-cut groove (212) are respectively arranged at the left side and the right side of the molding surface; a cross pouring channel (206) protruding upwards is further arranged on the side edge of the lower riser knock-off groove (212); a left sprue cup (205) protruding upwards is arranged on one side of the upper part of the stem (207) of the cutter bar;
the mould also comprises a counter plate mould, the counter plate mould comprises a counter plate (301), the working surface of the counter plate (301) is provided with a cutter bar part sand tyre (308) protruding upwards and a scraper part self-feeding core (309) sinking downwards, the scraper part self-feeding core (309) is positioned below the cutter bar part sand tyre (308), the cutter bar part sand tyre (308) is also provided with two side plate-shaped protruding sand tyres corresponding to the scraper structure, and a downwards sunk mounting surface groove self-feeding core (310) is arranged between the two side plate-shaped protruding sand tyres; an upper right riser (311) protruding upwards is arranged at the upper part of the sand tire (308) at the cutter bar part, a lower riser (312) protruding upwards is arranged at one side of the sand tire (308) at the cutter bar part, and a right sprue cup (305) and a sprue (306) protruding upwards and extending from top to bottom are arranged at the other side of the sand tire (308) at the cutter bar part.
2. The mold of a vertical shaft planetary concrete mixer blade according to claim 1, wherein: an upper left riser head cutting groove (211) is arranged between the upper left riser head (210) on the right seat plate (201) and the molding surface below the upper left riser head cutting groove.
3. The mold for a vertical-shaft planetary concrete mixer blade according to claim 1, wherein: an inner sprue (307) is further arranged on one side, close to the sprue (306), of the sand tire (308) at the cutter bar part, and an inner sprue easily-cut slope surface (316) is arranged between the inner sprue (307) and the plate-shaped protruding sand tire on the single side of the sand tire (308) at the cutter bar part; a lower riser easy-cutting slope surface (317) is arranged between the lower riser (312) and the plate-shaped protruding sand tire on the other side of the sand tire (308) on the cutter bar part.
4. A mold for a vertical shaft planetary concrete mixer blade according to claim 3, wherein: the cross-sectional area ratio of the sprue (306), runner (206), and ingate (307) is 1.0:1.2:1.2.
5. the mold of a vertical shaft planetary concrete mixer blade according to claim 1, wherein: an upper exhaust groove (313) is arranged above the upper right riser (311), and a lower exhaust groove (314) is arranged above the lower riser (312).
6. A mold for a vertical shaft planetary concrete mixer blade according to claim 3, wherein: the easy-cutting groove is a groove with a certain depth, wherein a certain included angle is formed between inclined slope surfaces at two sides of the groove, and the opening of the groove is downwards gradually reduced; the easy-cutting slope surface is a chamfer surface with a certain width and a slope surface angle.
7. A mould for a vertical shaft planetary concrete mixer blade according to any one of claims 1 to 6, wherein: the positive seat plate (201) is further provided with a positive mounting hole (202) and a positive positioning hole (203) which are used for mounting and positioning, the reverse seat plate (301) is also provided with a reverse mounting hole (302) and a reverse positioning hole (303), a positive anti-collision rod (204) is further arranged on the working surface of the positive seat plate (201), and a reverse anti-collision rod (304) is correspondingly arranged on the working surface of the reverse seat plate (301).
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| CN202110842435.0A CN113695518B (en) | 2021-07-26 | 2021-07-26 | Die and casting method for scraper knife of vertical shaft planetary concrete mixer |
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| CN202110842435.0A CN113695518B (en) | 2021-07-26 | 2021-07-26 | Die and casting method for scraper knife of vertical shaft planetary concrete mixer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB697376A (en) * | 1951-02-02 | 1953-09-23 | Victor Chapas | Improvements relating to gravity casting |
| CN102266908A (en) * | 2011-07-26 | 2011-12-07 | 安徽省宁国新宁实业有限公司 | Vertical-parting casting ball and casting section die |
| CN203947507U (en) * | 2014-06-26 | 2014-11-19 | 叶明星 | Integral type perching knife |
| CN105478677A (en) * | 2015-12-01 | 2016-04-13 | 济南方德利模具有限公司 | Casting technology of engine cylinder cover and core assembling structure |
| CN205684663U (en) * | 2016-04-29 | 2016-11-16 | 马鞍山市华达冶金机械有限公司 | A kind of arc liner plate enlightening sand line modelling mould |
| CN108941515A (en) * | 2018-09-13 | 2018-12-07 | 南通华东油压科技有限公司 | A kind of casting method of the mechanical-hydraulic valve body with seamless steel pipe |
| CN109396336B (en) * | 2018-11-07 | 2020-09-08 | 河南柴油机重工有限责任公司 | Casting method of main bearing cap of medium-speed and high-speed high-power diesel engine |
| CN112318064B (en) * | 2020-09-18 | 2021-08-17 | 马鞍山市华达冶金机械有限公司 | Manufacturing method of arc lining plate of discharge door of concrete mixer |
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Denomination of invention: Mold and casting method for a vertical axis planetary concrete mixer blade Effective date of registration: 20230323 Granted publication date: 20221202 Pledgee: Anhui Ma'anshan Rural Commercial Bank Co.,Ltd. Pledgor: MAANSHAN HUADA METALLURGICAL & MACHINERY Co.,Ltd. Registration number: Y2023980035841 |