CN107971464B - Mould for producing double-screw extruder barrel bushing - Google Patents

Mould for producing double-screw extruder barrel bushing Download PDF

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Publication number
CN107971464B
CN107971464B CN201711238209.1A CN201711238209A CN107971464B CN 107971464 B CN107971464 B CN 107971464B CN 201711238209 A CN201711238209 A CN 201711238209A CN 107971464 B CN107971464 B CN 107971464B
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box body
sprue
screw extruder
producing
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CN107971464A (en
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费文鑫
谷常伟
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MAANSHAN HUAWEI MECHANICAL MACHINERY CO Ltd
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MAANSHAN HUAWEI MECHANICAL MACHINERY CO Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/22Moulds for peculiarly-shaped castings
    • B22C9/24Moulds for peculiarly-shaped castings for hollow articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/08Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/082Sprues, pouring cups
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/08Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/086Filters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/08Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/088Feeder heads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/10Cores; Manufacture or installation of cores
    • B22C9/106Vented or reinforced cores
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04Influencing the temperature of the metal, e.g. by heating or cooling the mould

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

The invention discloses a die for producing a cylinder liner of a double-screw plastic extruding machine, and belongs to the field of ferrous metallurgy. The device comprises an upper box body and a lower box body, wherein a forming cavity for producing a cylinder liner of a double-screw extruder is defined between the upper box body and the lower box body, a loam core for forming a double-screw mounting hole is arranged in the middle of the forming cavity, a heating riser is arranged in the middle of the top of the forming cavity in the upper box body, a graphite chill is arranged in the middle of the bottom of the forming cavity in the lower box body, inner gates are symmetrically arranged at one side of the forming cavity close to the end, and an outer gate and a pouring channel which are communicated with the inner gates are simultaneously arranged on the upper box body. According to the invention, feeding is carried out when the upper and lower thick walls of the molding cavity are poured through the heating risers and the graphite chill, and the two pouring ports are adopted to disperse the heat of the molten metal, so that the quality of the lining can be improved, surface cracking can be reduced, and the shrinkage cavity and shrinkage porosity can be effectively prevented.

Description

Mould for producing double-screw extruder barrel bushing
Technical Field
The invention relates to the technical field of production dies for bushings of plastic extruders, in particular to a die for producing cylinder bushings of a double-screw plastic extruder.
Background
Because the outer wall of the cylinder liner of the double-screw extruder is oval, and the inner wall of the cylinder liner is of an infinite type special structure, in the production and pouring process, upper and lower sharp corner regions of the infinite type cylinder belong to thick positions, and the wall thicknesses of other positions are uniform, so that the feeding of the triangular region in the pouring process is extremely difficult, shrinkage cavities are easily formed, and in addition, the liner position connected with a pouring gate is easily loosened due to continuous scouring of molten metal. The existing mold can not meet feeding of an upper area and a lower area of a lining and a pouring gate area in the pouring process, and defects are easy to generate, so that the development of the double-screw extruding machine cylinder lining mold has important significance for the industry of the double-screw extruding machine.
Through search, patent schemes are disclosed. As in the Chinese patent: application No.: 2013201440090, patent name: a barrel for a twin screw extruder, having a cylindrical shape, the cylindrical shape comprising: 2013.03.27. the utility model discloses a barrel for a double-screw extruder, which comprises an outer barrel and a bushing, wherein the outer barrel is a cuboid, an infinity hole is arranged in the outer barrel, the bushing is arranged in the infinity hole, and the bushing is matched with the infinity hole; and the upper end and the lower end of the outer cylinder are respectively provided with at least one heating rod placing hole. The beneficial effects of adopting the technical scheme are that: the control precision of the temperature is effectively improved, so that the extrusion process is more stable, the product quality is more stable, the equipment failure rate is reduced, the product yield is improved, the energy is saved, the consumption of spare parts is reduced, considerable economic benefits can be created, most importantly, excessive cooling and heating caused by thermal inertia are avoided, the thermal radiation distance is shortened, and the precision and the response speed of temperature control are improved. However, the heating rod on the cylinder body cannot meet the feeding of a ∞ type sharp-angle region, and the cylinder body is easy to generate defects such as shrinkage porosity or cracking.
As another example, the Chinese patent: application No.: 2010201074175, patent name: a high temperature resistant anticorrosion double screw extruder barrel, application date: 2010.01.27. the utility model discloses a high temperature resistant anticorrosion double screw extruder barrel, including a casing, its characterized in that casing internal surface is provided with and breathes out C alloy build-up welding anticorrosive coating, breathes out C alloy build-up welding anticorrosive coating and fuses on casing internal surface, the utility model discloses can effectively avoid adopting the phenomenon that the bush that the inlay cover anticorrosive coating brought contracts in, shifts, bush and barrel end face flange face seam corrodes, fts, has eliminated the clearance between former casing and the inside lining, has improved barrel temperature resistant difference change and anticorrosive ability greatly. But the defects of insufficient feeding of the outer surface of the shell, easy shrinkage porosity or cracking and the like are easily caused.
Disclosure of Invention
1. Technical problem to be solved by patent
The purpose of this patent is overcome the shrink of surperficial thick wall position about the barrel and the shrinkage porosity problem with the ingate junction in the bush in the pouring process of current double screw extruding machine bush, provides a mould of production double screw extruding machine barrel bush. According to the invention, feeding is carried out when the upper and lower thick walls of the molding cavity are poured through the heating riser and the graphite chill, and the heat of the metal liquid is dispersed by adopting two inner gates, so that the quality of the lining can be improved, surface cracking can be reduced, and shrinkage cavities and shrinkage porosity can be effectively prevented.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a die for producing a cylinder liner of a double-screw extruder, which comprises an upper box body and a lower box body, wherein a forming cavity for producing the cylinder liner of the double-screw extruder is enclosed between the upper box body and the lower box body; the inner wall of the forming cavity is of an infinite type, and a sharp corner part connected with the middle of the infinite type forms a thick triangular area; a mud core for forming the double-screw mounting hole is arranged in the middle of the forming cavity; a heating riser is arranged in the middle of the top of the molding cavity in the upper box body; a graphite chill is arranged in the middle of the bottom of the forming cavity in the lower box body; inner gates are symmetrically arranged on one side of the molding cavity; and the upper box body is simultaneously provided with an outer pouring gate and a pouring channel which are communicated with the inner pouring gate.
As a further improvement of the invention, the pouring channel is a side-mounted pouring channel and comprises a sprue, a sprue pit, a cross gate, a common riser and an inner gate which are arranged at the middle position of one side of the molding cavity, wherein the sprue pit is arranged at the bottom of the sprue, and an arc-shaped groove is formed at the bottom of the sprue pit; two sides of the upper part of the straight pouring gate pit are communicated with a horizontal cross gate; the tail ends of the two cross runners are respectively connected with a common side riser; the two common side risers are respectively connected with two inner gates; the two inner gates are communicated with the molding cavity. The straight pouring way nest and the cross pouring way are covered with filter screens, and the filter screens extend into the common side dead heads to play a role in filtering.
As a further improvement of the invention, the sprue is a vertical cylindrical hollow pipeline, the sprue is positioned in the upper box body, the sprue is perpendicular to the molding cavity, and the bottom of the sprue is positioned on the parting surface of the upper box body; and a funnel-shaped outer pouring gate is arranged at the molten metal inlet end of the sprue.
As a further improvement of the invention, the bottom of the sprue is connected with a straight-pouring gate nest positioned in the lower box body, the bottom of the straight-pouring gate nest is an arc-shaped groove which can buffer molten metal entering the straight-pouring gate nest, and the inner cavity of the straight-pouring gate nest is communicated with the inner cavity of the sprue.
As a further improvement of the invention, the top of the straight pouring gate nest is symmetrically provided with cross runners, the cross runners are parallel to the molding cavity, the cross runners are communicated with the straight pouring gate nest, and the top of the cross runners is positioned on the parting surface of the lower box body.
As a further improvement of the invention, the tail ends of the cross runners on two sides are symmetrically communicated with common side risers, each common side riser consists of a circular truncated cone on the upper part and an arc-shaped groove on the bottom part, the circular truncated cones are positioned in the upper box body, the arc-shaped grooves are positioned in the lower box body, and the arc-shaped grooves are communicated with the cross runners.
As a further improvement of the invention, the lower parts of the circular truncated cones of the two common side risers are communicated with an inner pouring gate, the inner pouring gate is positioned in the upper box body, and the bottom of the inner pouring gate is positioned on the parting surface of the upper box body.
As a further improvement of the invention, the two symmetrically arranged inner gates are communicated with the molding cavity, the height of each inner gate is 0.9 times of the thickness of the casting wall, the molten metal enters the molding cavity through the inner gates, and the two inner gates can disperse the heat of the molten metal.
As a further improvement of the invention, the sand core is a precoated sand core formed by intersecting two cylindrical precoated sands with the same diameter side by side.
As a further improvement of the invention, air outlet holes are symmetrically arranged at both ends of each cylinder of the loam core.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the invention discloses a die for producing a cylinder liner of a double-screw extruder, which comprises an upper box body and a lower box body, wherein a forming cavity for producing the cylinder liner of the double-screw extruder is enclosed between the upper box body and the lower box body; the inner wall of the forming cavity is of an infinite type, and a sharp corner part connected with the middle of the infinite type forms a thick triangular area; a mud core for forming the double-screw mounting hole is arranged in the middle of the forming cavity; a heating riser is arranged in the middle of the top of the molding cavity in the upper box body; an external chill is arranged in the middle of the bottom of the forming cavity in the lower box body; and inner gates are symmetrically arranged on one side of the molding cavity, and an outer gate and a pouring channel which are communicated with the inner gates are simultaneously arranged on the upper box body. The heating riser head is used for feeding a triangular area in the upper box, so that the solidification time of molten metal is reduced, and the feeding efficiency is improved; when the dead head is cleaned, the dead head is knocked by an iron hammer, so that time and labor are saved. The graphite chill is used for chilling the triangular area in the lower box, the graphite chill has high refractoriness and large heat conductivity coefficient, and the problems of looseness and shrinkage cavity of a casting can be better solved by chilling the graphite chill, so that the casting defects such as white spots, air holes and the like are reduced; the graphite chill is convenient to recycle;
(2) the invention relates to a die for producing a cylinder liner of a double-screw plastic extruding machine, wherein a pouring channel is in a side-mounted type and comprises a sprue, a sprue pit, a cross gate, a common riser and an inner gate which are arranged in the middle of one side of a forming cavity, and the bottom of the sprue is provided with the sprue pit with an arc-shaped bottom; two sides of the upper part of the straight pouring gate pit are connected with a horizontal cross gate; the tail ends of the two cross runners are respectively connected with a common side riser; the two common side risers are respectively connected with two inner gates; and the two inner gates are connected with the molding cavity. The straight pouring way nest and the cross pouring way are covered with filter screens, and the filter screens extend into the common side dead head. When pouring, molten metal flows into the sprue pit from the sprue through the filter screen, then turns upwards, flows into the bottoms of the common side risers at two sides from the runners, flows into the ingates through the filter screen, enters the whole forming cavity through the two ingates, and is filtered at least twice through the filter screen, so that molten metal inclusion is effectively reduced from entering the forming cavity. Meanwhile, the molten metal is buffered for many times, so that the scouring of a forming cavity is reduced, and the heat of the molten metal is effectively dispersed;
(3) the invention relates to a die for producing a cylinder liner of a double-screw plastic extruding machine, wherein a sprue is a vertical cylindrical hollow pipeline and is vertical to a forming cavity, and a funnel-shaped outer sprue is arranged at a molten metal inlet end of the sprue. The funnel-shaped outer pouring gate receives the molten metal from the casting ladle, so that splashing and overflow are prevented, pouring is facilitated, and direct impact of the molten metal on the mold is reduced;
(4) according to the die for producing the cylinder liner of the double-screw extruder, the bottom of the sprue is connected with the direct runner nest positioned in the lower box body, the bottom of the direct runner nest is provided with the arc-shaped groove, so that molten metal can be buffered, and sand washing is avoided to form sand holes;
(5) according to the die for producing the cylinder liner of the double-screw extruder, the top of the straight pouring gate nest is symmetrically provided with the cross runners, the cross runners are parallel to the forming cavity, and the cross runners are communicated with the straight pouring gate nest. The horizontal pouring channels on the two sides disperse the heat of the molten metal and buffer the scouring of the molten metal to the forming cavity and the loam core;
(6) according to the die for producing the cylinder bushing of the double-screw extruder, the tail ends of the cross runners on the two sides are symmetrically communicated with the common side risers, each common side riser consists of a circular table at the upper part and an arc-shaped groove at the bottom part, the circular table is positioned in the upper box body, the arc-shaped groove is positioned in the lower box body, and the arc-shaped groove is communicated with the cross runners. The two ordinary side risers store and supply molten metal required by the forming cavity, the molten metal is dispersed and fed, the heat preservation effect is good, and the functions of preventing shrinkage cavity, shrinkage porosity and slag collection are achieved;
(7) according to the die for producing the cylinder bushing of the double-screw extruder, the lower parts of the circular truncated cones of the two common side risers are communicated with the inner gates, and the inner gates are positioned in the upper box body. The two inner gates disperse the heat of the molten metal, so that the process thermal section formed by long-term scouring of the molten metal is reduced, and shrinkage porosity is avoided;
(8) according to the die for producing the cylinder liner of the double-screw extruder, the height of the inner sprue is 0.9 times of the wall thickness of a casting, so that the feeding effect is achieved, and shrinkage cavities caused by the fact that the inner sprue is too large are avoided;
(9) the invention relates to a die for producing a cylinder liner of a double-screw extruder, wherein a sand-coated sand core is formed by intersecting two cylindrical coated sands with the same diameter side by side. The precoated sand core has the advantages of high strength, high temperature resistance, low expansion and the like, is good in sand adhesion resistance, easy to demould and high in surface smoothness of a casting when used in a bushing forming cavity of a double-screw extruder;
(10) according to the die for producing the cylinder liner of the double-screw extruder, the two ends of each cylinder of the clay core are symmetrically provided with the air outlet holes. The air outlet can exhaust gas generated in the pouring process, the occurrence rate of casting air holes is reduced, and waste products are avoided.
Drawings
FIG. 1 is a schematic front view of a barrel bushing mold of a twin screw extruder;
FIG. 2 is a schematic diagram of a front view of a barrel bushing mold of a twin screw extruder;
FIG. 3 is a schematic left side view of a barrel bushing mold of a twin screw extruder;
FIG. 4 is a schematic front view of the upper case;
FIG. 5 is a schematic front view of the lower case;
FIG. 6 is a schematic view of a cross-section of a mold cavity;
fig. 7 is a front structural view of the in-gate.
The reference numerals in the schematic drawings illustrate: 1. an outer gate; 2. a sprue; 3. directly pouring a pit; 4. a cross gate; 5. a common side riser; 6. an inner gate; 7. a heating riser; 8. graphite chill; 9. a core; 10. an air outlet; 11. and forming a cavity.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1
As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the mold for producing the cylinder liner of the twin-screw extruder of the present embodiment comprises an upper box body and a lower box body, wherein a molding cavity 11 for producing the cylinder liner of the twin-screw extruder is defined between the upper box body and the lower box body; the inner wall of the molding cavity 11 is infinity-shaped, and a sharp corner part where infinity-shaped middle parts are connected forms a thick triangular area; the middle part of the forming cavity 11 is provided with a loam core 9 for forming a double-screw mounting hole; a heating riser 7 is arranged in the middle of the top of the molding cavity 11 in the upper box body; a graphite chilling block 8 is arranged in the middle of the bottom of the forming cavity 11 in the lower box body; the molding device is characterized in that inner gates 6 are symmetrically arranged on one side of the molding cavity 11 close to the front end part and the rear end part, and an outer gate 1 and a pouring channel communicated with the inner gates 6 are simultaneously arranged on the upper box body.
In the embodiment, the diameter of the heating riser is 1.8-2.2 times of the diameter of a casting hot spot circle, and the heating riser is used for feeding a triangular area in an upper box, so that the solidification time of molten metal is reduced, and the feeding efficiency is improved; when the dead head is cleaned, the dead head is knocked by an iron hammer, so that time and labor are saved.
In the embodiment, the thickness of the graphite chiller is 0.7-0.8 times of the diameter of a hot spot circle of the casting, the graphite chiller chills a triangular area in the lower box, the graphite chiller has high refractoriness and large heat conductivity coefficient, and the graphite chiller is used for chilling to better solve the problems of looseness and shrinkage cavity of the casting and reduce casting defects such as white spots, air holes and the like; and the graphite chill is convenient to recycle.
Example 2
As shown in fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the mold for producing the cylinder liner of the twin-screw extruder according to the present embodiment is a side-by-side casting channel, and includes a sprue 2, a sprue pit 3, a runner 4, a common riser 5 and an ingate 6, which are disposed at a middle position on one side of a molding cavity 11, and the sprue pit 3 having an arc-shaped bottom is disposed at the bottom of the sprue 2; two sides of the upper part of the straight pouring gate pit 3 are connected with a horizontal cross gate 4; the tail ends of the two cross runners 4 are respectively connected with a common side riser 5; the two ordinary side risers 5 are respectively connected with two inner gates 6; the two ingates 6 are connected to a molding cavity 11. The straight pouring way nest 3 and the cross pouring channel 4 are covered with filter screens, and the filter screens extend into the common side riser 5 to play a role in filtering.
In this embodiment, the molten metal is poured from the sprue 2, rushes into the sprue bush 3 through the filter screen, then the molten metal turns up, toward the sprue 4 on both sides, flows into the bottom of the common side riser 5 on both sides from the sprue 4, then the molten metal turns up again and flows into the ingate 6 through the filter screen, enters into the whole molding cavity 11 through the two ingates 6, the molten metal is filtered at least twice through the filter screen, the inclusion of the molten metal is effectively reduced to enter into the molding cavity 11, and the molten metal is buffered for many times, so that the scouring of the molding cavity and the mud core is reduced, and the heat of the molten metal is effectively dispersed.
Example 3
As shown in fig. 1 and fig. 2, in the mold for producing a barrel bushing of a twin-screw extruder in the embodiment, the sprue 2 is a vertical cylindrical hollow pipeline, the sprue 2 is located in an upper box body, the sprue 2 is arranged perpendicular to the molding cavity 11, and the bottom of the sprue 2 is located on a parting surface of the upper box body; and a funnel-shaped outer pouring gate 1 is arranged at the molten metal inlet end of the sprue 2.
In this embodiment, molten metal is poured from a funnel-shaped outer gate 1, passes through a sprue 2, and flows into a sprue pocket 3. The funnel-shaped outer pouring gate 1 receives the molten metal from the casting ladle, so that splashing and overflow are prevented, pouring is facilitated, and meanwhile, the direct impact of the molten metal on the sprue 2 is reduced;
example 4
As shown in fig. 1, fig. 2 and fig. 3, in the mold for producing the cylinder liner of the twin-screw extruder of the present embodiment, the bottom of the sprue 2 is connected with the sprue pit 3 located in the lower box, and the bottom of the sprue pit 3 is an arc-shaped groove, so that the molten metal entering the sprue pit 3 can be buffered, and sand holes can be prevented from being formed by sand washing.
The inner cavity of the straight pouring gate pit 3 is communicated with the inner cavity of the straight pouring gate 2 in the embodiment.
Example 5
As shown in figures 1 and 5, in the mould for producing the cylinder liner of the twin-screw extruder, the top of the sprue bush 3 is symmetrically provided with the cross runners 4, the cross runners 4 are parallel to the forming cavity 11, the cross runners 4 are communicated with the sprue bush 3, and the top of the cross runners 4 is positioned on the parting surface of the lower box body.
In the embodiment, the cross runners 4 on the two sides disperse the heat of the molten metal and buffer the scouring of the molten metal on the forming cavity and the sand core.
Example 6
As shown in fig. 1, fig. 2 and fig. 3, in the mold for producing a barrel bushing of a twin-screw extruder of the present embodiment, the ends of the runners 4 at both sides are symmetrically communicated with the common side risers 5, the common side risers 5 are composed of a circular truncated cone at the upper part and an arc-shaped groove at the bottom part, the circular truncated cone is located in the upper box body, the arc-shaped groove is located in the lower box body, and the arc-shaped groove is communicated with the runners 4.
In this embodiment, the two ordinary side risers 5 store and supply the molten metal required by the forming cavity 11, and the feeding can be dispersed.
Example 7
As shown in fig. 1 and fig. 3, in the mold for producing a barrel bushing of a twin-screw extruder according to the embodiment, the lower parts of the circular truncated cones of the two ordinary side risers 5 are communicated with the ingates 6, the ingates 6 are located in the upper box, and the bottoms of the ingates 6 are located on the parting surface of the upper box.
Two ingates symmetrically arranged in the embodiment disperse the heat of the molten metal, thereby reducing the process thermal link formed by long-term scouring of the molten metal and avoiding shrinkage porosity.
Example 8
As shown in figures 1, 3 and 7, the die for producing the cylinder liner of the twin-screw extruder is provided with two symmetrically arranged ingates communicated with a forming cavity, and the height h of the ingates is 0.9 times of the wall thickness of a casting.
In the embodiment, the inner gate plays a role in feeding, and shrinkage cavity caused by overlarge inner gate is avoided.
Example 9
In the mold for producing a barrel liner of a twin-screw extruder of the present embodiment, as shown in fig. 1, 2, 3 and 4, the core 9 is a sand-coated core formed by intersecting two cylindrical coated sands of the same diameter side by side. The precoated sand core is used in a bushing forming cavity of a double-screw extruder, has good anti-sand adhesion performance and high surface smoothness of a casting, and is easy to demould.
Example 10
As shown in FIGS. 1, 2 and 3, in the mold for producing a barrel liner of a twin-screw extruder of the present embodiment, air outlet holes 10 are symmetrically provided at both ends of each cylindrical body of the core 9.
In the embodiment, at least two or more air outlets are provided, and the air outlets 10 can exhaust gas generated in the pouring process, so that the occurrence rate of casting air holes is reduced, and waste products are avoided.
Example 11
As shown in fig. 1, fig. 2, fig. 5, fig. 6 and fig. 7, the mold for producing a barrel bushing of a twin-screw extruder of the present embodiment, wherein the casting process comprises the steps of:
the method comprises the following steps: mixing sand, wherein the performance of the sand is controlled to be 4.5-5.5% of water, 110-140% of air permeability, 120-150 kPa of wet compression strength and 38-42% of compaction rate;
step two: manufacturing a mould, wherein the mould comprises sand mixing, sand casting modeling and mould assembling, an upper box body with two inner gates 6 and a heating riser 7 and a lower box body with a graphite chill 8 are formed, a forming cavity 11 for producing a cylinder liner of a double-screw extruder is enclosed between the upper box body and the lower box body, and side-mounted pouring channels are arranged in the upper box body and the lower box body;
step three: pouring, including pouring with high-vanadium-chromium iron molten iron, wherein the molten iron enters the molding cavity 11 of the cylinder liner of the double-screw extruder through a pouring channel until the molding cavity 11 is completely filled with the molten iron;
step four: opening the box after heat preservation for 4 hours, and keeping the heat preservation site dry to prevent the casting from cracking;
step five: knocking the box body to shake, so that the sand and the casting fall down together, the sand core 9 is also dispersed and falls off at the same time, and then taking out the casting by using a hook;
step six: removing a casting head, wherein the casting head comprises a heating casting head 7 and a common side casting head 5;
step seven: and (4) performing shot blasting and polishing, namely performing shot blasting and polishing by using a hook type shot blasting machine.
In the embodiment, the mold compactness of the green sand molding is high; the heating riser 7 is used for feeding a triangular area in the upper box, so that the solidification time of molten iron is reduced, and the feeding efficiency is improved; when the dead head is cleaned, the dead head is knocked by an iron hammer, so that time and labor are saved. The graphite chiller 8 chills the triangular area in the lower box, the graphite chiller 8 has high refractoriness and large heat conductivity coefficient, and the graphite chiller 8 can better solve the problems of looseness and shrinkage cavity of the casting and reduce the casting defects of white spots, air holes and the like; and the graphite chilling block 8 is convenient to recycle. The two inner gates 6 disperse the heat of the molten iron, reduce the process thermal section formed by long-term scouring of the molten iron and avoid shrinkage porosity. The high-vanadium-chromium-iron molten iron is buffered for many times in the side-mounted pouring channel, so that the scouring of the die is reduced, and the heat of the molten iron is effectively dispersed. The box is allowed to be opened after the heat is preserved for more than 4 hours, the excessive stress of the casting is prevented, and the heat preservation site is kept dry to prevent the casting from cracking.
Example 12
As shown in fig. 1, fig. 2, fig. 5 and fig. 6, the mold for producing the barrel bushing of the twin-screw extruder of the present embodiment comprises the steps of:
molding sand, molding a side-mounted pouring channel communicated with an outer pouring gate 1 in an upper box body and a lower box body, wherein the side-mounted pouring channel comprises a sprue 2, a sprue pit 3, a cross runner 4, a common riser 5 and an inner pouring gate 6, and the sprue pit 3 is arranged at the bottom of the sprue 2; the upper part of the straight pouring gate pit 3 is communicated with a horizontal cross gate 4; the tail ends of the two cross runners 4 are respectively connected with a common side riser 5; the two ordinary side risers 5 are respectively connected with two inner gates 6; the two inner gates 6 are communicated with a molding cavity 11;
and (II) closing the box to form a complete box body to be poured.
In the embodiment, high-vanadium-chromium-iron molten iron is poured into a sprue pit 3 from a sprue 2 through a filter screen during pouring, then molten metal is turned upwards and flows into the bottoms of common side risers 5 on two sides from the sprue 4 towards the runners on two sides, then the molten metal is turned upwards and flows into an inner sprue 6 through the filter screen, the molten metal enters a whole molding cavity 11 through the two inner sprue 6, and the molten metal is filtered by the filter screen at least twice, so that molten metal inclusion is effectively reduced and enters the molding cavity 11. Meanwhile, the metal liquid is buffered for many times, so that the scouring of the forming cavity 11 is reduced, and the heat of the metal liquid is effectively dispersed.
Example 13
Referring to fig. 1, 2, 5 and 6, the mold for producing a barrel liner of a twin-screw extruder of the present embodiment comprises the following concrete steps:
spraying a release agent in an upper box body molding machine, reserving a position of a heating riser 7, then adding green sand, pressing to prepare a funnel-shaped outer pouring gate 1, wherein the outer pouring gate 1 is communicated with a side pouring channel;
b, turning over the box, and then adding a heating riser 7 to prepare an upper box body;
c, spraying a release agent into the lower box body molding machine, putting the graphite chill 8, then adding green sand, and turning over after pressing to prepare a lower box body;
d, placing the sand core 9 in the lower box body as a precoated sand core;
e, covering a filter screen on the sprue pit 3, the cross gate 4 and the common side riser 5 of the lower box body.
In the embodiment, the release agent is beneficial to the natural separation of the box body and the molding machine, and does not stick sand; the funnel-shaped outer pouring gate 1 is beneficial to molten iron to flow into the straight pouring gate 2, so that the molten iron scouring to the outer pouring gate 1 is reduced, sand is prevented from entering the molten iron, meanwhile, splashing is prevented, and the utilization rate of the molten iron is improved; the precoated sand core has the advantages of high strength, high temperature resistance, low expansion and the like, is good in sand adhesion resistance, easy to demould and high in surface smoothness of a casting when used in a bushing forming cavity 11 of a double-screw extruder; the filter screen covered in the pouring channel of the lower box body effectively reduces the molten iron inclusions from entering the molding cavity 11.
Example 14
As shown in fig. 1, fig. 2, fig. 5 and fig. 6, the mold for producing a barrel liner of a twin-screw extruder of the present embodiment, wherein the casting process comprises the steps of:
the high-vanadium-chromium-iron molten iron comprises 2.7 percent of C, 0.6 percent of Si, 0.4 percent of Mn, 0.01 percent of P, 0.01 percent of S, 27 percent of Cr, 0.9 percent of Mo, 3.5 percent of V, 64 percent of Fe and the balance of trace elements, wherein the trace elements which can be detected at present comprise Al, As, B, Bi, Co, Mg, Nb, Ni, Pb, Cu, Si, Sb, Sn, Ti, W and Zn;
(II) the charging sequence of the high vanadium chromium iron molten iron is that low carbon steel is firstly added, then high carbon ferrochrome and low carbon ferrochrome are simultaneously added, ferromolybdenum is added, ferrovanadium is finally added, the ferrovanadium is easy to burn and oxidize, and the ferrovanadium is finally added;
thirdly, molten iron is discharged at 1620 ℃, and silicon, manganese and 0.1 percent of aluminum wires are added for deoxidation before the molten iron is discharged;
and (IV) pouring molten iron at 1500 ℃, wherein the pouring speed is 1.8 kg/s.
In the embodiment, high-vanadium-chromium-iron molten iron is adopted for pouring, so that the wear resistance, strength, toughness, ductility and heat resistance of the casting can be improved.
Example 15
As shown in fig. 1, fig. 2, fig. 5 and fig. 6, the mold for producing a barrel liner of a twin-screw extruder of the present embodiment, wherein the casting process comprises the steps of:
the high-vanadium-chromium-iron molten iron comprises 2.9 percent of C, 0.9 percent of Si, 0.8 percent of Mn, 0.03 percent of P, 0.03 percent of S, 29 percent of Cr, 1.1 percent of Mo, 4.5 percent of V, 60 percent of Fe and the balance of trace elements, wherein the trace elements which can be detected at present comprise Al, As, B, Bi, Co, Mg, Nb, Ni, Pb, Cu, Si, Sb, Sn, Ti, W and Zn;
(II) the charging sequence of the high vanadium chromium iron molten iron is that low carbon steel is firstly added, then high carbon ferrochrome and low carbon ferrochrome are simultaneously added, ferromolybdenum is added, ferrovanadium is finally added, the ferrovanadium is easy to burn and oxidize, and the ferrovanadium is finally added;
thirdly, molten iron is discharged at 1650 ℃, and silicon, manganese and 0.1 percent of aluminum wires are added for deoxidation before the molten iron is discharged;
and (IV) pouring molten iron at 1550 ℃, wherein the pouring speed is 2.2 kg/s.
In the embodiment, high-vanadium-chromium-iron molten iron is adopted for pouring, so that the wear resistance, strength, toughness, ductility and heat resistance of the casting can be improved.
Example 16
As shown in fig. 1, fig. 2, fig. 5 and fig. 6, the mold for producing a barrel liner of a twin-screw extruder of the present embodiment, wherein the casting process comprises the steps of:
the high-vanadium-chromium-iron molten iron comprises 2.8 percent of C, 0.8 percent of Si, 0.6 percent of Mn, 0.02 percent of P, 0.02 percent of S, 28 percent of Cr, 1.0 percent of Mo, 4.0 percent of V, 62 percent of Fe and the balance of trace elements, wherein the trace elements which can be detected at present comprise Al, As, B, Bi, Co, Mg, Nb, Ni, Pb, Cu, Si, Sb, Sn, Ti, W and Zn;
(II) the charging sequence of the high vanadium chromium iron molten iron is that low carbon steel is firstly added, then high carbon ferrochrome and low carbon ferrochrome are simultaneously added, ferromolybdenum is added, ferrovanadium is finally added, the ferrovanadium is easy to burn and oxidize, and the ferrovanadium is finally added;
thirdly, discharging molten iron at 1635 ℃, and adding silicon, manganese and 0.1% of aluminum wires for deoxidation before discharging the molten iron;
and (IV) pouring the molten iron at the temperature of 1530 ℃, wherein the pouring speed is 2.0 kg/s.
In this embodiment, the high-vanadium-chromium-iron molten iron is adopted for pouring, so that the wear resistance, strength, toughness, ductility and heat resistance of the casting can be improved, and the wear resistance test experimental data of the casting in this embodiment are shown in the following table:
TABLE 1 abrasion resistance test data sheet for castings
From the above test data, it can be seen that the wear amount of the sample is relatively small whether the test is performed by using a block sample or a ring sample, and therefore, it can be seen that the barrel bushing of the twin-screw extruder produced by using the high-vanadium ferrochrome has strong wear resistance.
Example 17
As shown in fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the mold for producing the barrel bushing of the twin-screw extruder of the present embodiment, wherein the specific process of removing the casting head is as follows:
firstly, the heating riser 7 is hammered and knocked to fall off;
and (II) cutting the common side riser 5 into the depth of half of the thickness of the inner sprue 6 by using a cutting machine, and hammering the common side riser towards the casting direction to enable the common side riser to fall off.
In the embodiment, the heating riser 7 is knocked off by hammering, so that time and labor are saved, and defects such as cracking and the like are avoided; when the common side riser 5 is removed, the cutter only needs to cut into the depth of half of the thickness of the inner sprue 6, time and labor are saved, and the defects of cracking and the like caused by heat concentration due to long-time cutting are avoided.
Example 18
As shown in FIGS. 2, 3, 4, 5 and 6, the mold for producing the cylinder liner of the twin-screw extruder of the present embodiment employs a Z148 molding flask for the upper and lower cases, and the height of the upper case is 250 mm and 300 mm.
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 (9)

1. The utility model provides a mould of production twin-screw extruding machine barrel bush, includes box and lower box, its characterized in that: a forming cavity (11) is enclosed between the upper box body and the lower box body; the section of the inner wall of the molding cavity (11) is infinity-shaped, and a sharp corner part connected between infinity-shaped middles forms a thick triangular area; a mud core (9) is arranged in the middle of the forming cavity (11); a heating riser (7) is arranged in the middle of the top of a forming cavity (11) in the upper box body, and the diameter of the heating riser (7) is 1.8-2.2 times of that of a casting hot joint circle; a graphite chiller (8) is arranged in the middle of the bottom of a forming cavity (11) in the lower box body, and the thickness of the graphite chiller (8) is 0.7-0.8 times of the diameter of a casting hot spot circle; inner gates (6) are symmetrically arranged on one side of the molding cavity (11), and an outer gate (1) and a pouring channel which are communicated with the inner gates are simultaneously arranged on the upper box body;
the casting channel is a side casting channel and comprises a sprue (2), a sprue pit (3), a cross gate (4), a common side riser (5) and an inner sprue (6), wherein the sprue pit (3) is arranged in the middle of one side of the molding cavity, and the bottom of the sprue (2) is provided with the sprue pit; the upper part of the straight pouring channel pit (3) is communicated with a horizontal cross gate (4); the tail ends of the two cross runners (4) are respectively connected with a common side riser (5); the two ordinary side risers (5) are communicated with an inner sprue (6); the straight pouring gate pit (3) and the cross gate (4) are covered with filter screens.
2. The die of claim 1 for producing a barrel bushing of a twin screw extruder, wherein: the sprue (2) is a vertical cylindrical hollow pipeline, the sprue (2) is positioned in the upper box body, the sprue (2) is perpendicular to the forming cavity (11), and the bottom of the sprue (2) is positioned on the parting surface of the upper box body; the molten metal inlet end of the sprue (2) is provided with a funnel-shaped outer sprue (1).
3. A mold for producing a barrel liner of a twin screw extruder as claimed in claim 1 or 2, wherein: the bottom of the sprue (2) is connected with a straight pouring pit (3) positioned in the lower box body, the bottom of the straight pouring pit (3) is an arc-shaped groove, and the inner cavity of the straight pouring pit (3) is communicated with the inner cavity of the sprue (2).
4. The die of claim 3 for producing a barrel bushing of a twin screw extruder, wherein: the top of the straight-pouring channel pit (3) is symmetrically provided with cross runners (4), the cross runners (4) are parallel to the forming cavity (11), the cross runners (4) are communicated with the straight-pouring channel pit (3), and the top of the cross runners (4) is positioned on the parting surface of the lower box body.
5. The die of claim 1 for producing a barrel bushing of a twin screw extruder, wherein: the tail ends of the cross runners (4) on two sides are symmetrically communicated with common side risers (5), each common side riser (5) consists of a circular truncated cone on the upper portion and an arc-shaped groove at the bottom, and the arc-shaped grooves are communicated with the cross runners (4).
6. The die of claim 5 for producing a barrel bushing of a twin screw extruder, wherein: the lower parts of the round tables of the two common side risers (5) are communicated with inner gates (6), the inner gates (6) are located in the upper box body, and the bottoms of the inner gates (6) are located on the parting surface of the upper box body.
7. The die of claim 6 for producing a barrel bushing of a twin screw extruder, wherein: the two symmetrically arranged inner gates (6) are communicated with the molding cavity (11), and molten metal enters the molding cavity (11) through the inner gates (6).
8. The die of claim 1 for producing a barrel bushing of a twin screw extruder, wherein: the mud core (9) is formed by intersecting two cylinders with the same diameter side by side.
9. A mold for producing a barrel liner of a twin screw extruder as claimed in claim 1 or 8, wherein: and air outlet holes (10) are symmetrically formed at two ends of each cylinder of the sand core (9).
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CN109317620A (en) * 2018-11-30 2019-02-12 马鞍山市华威冶金机械有限公司 A kind of mold and its casting method of batch casting Bitruder barrel liner
CN110039008A (en) * 2019-06-05 2019-07-23 国营第六一六厂 A kind of clearance type rising pouring pressurization system for casting and pouring
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