A bottom-feeding aluminum holding furnace for a differential pressure casting machine

Abstract

The present invention discloses a bottom aluminum supply heat preservation furnace for a differential pressure casting machine, belonging to the technical field of aluminum alloy casting, which includes a heat preservation furnace body, a horizontally arranged heater and a sealing structure, and an automatic opening and closing aluminum receiving device with a sealing mechanism; the heat preservation furnace body includes a heat insulation layer, a backing layer and a working layer. An aluminum liquid receiving port is opened in the upper part of the side wall of the heat preservation furnace body. A horizontally arranged dipping heating device is arranged near the bottom inside the heat preservation furnace body. A conical soft sealing structure is adopted between the heater and the furnace body; a toothed clamp conical surface sealing structure is arranged outside the aluminum liquid receiving port, and a double-layer annular sealing ring is used to ensure the isolation of internal and external pressures. The process of sealing opening and closing is jointly realized by a rotary pressing cylinder and a swinging opening and closing cylinder; this heat preservation furnace improves the differential pressure casting efficiency from the aluminum supply equipment, increases the service life of the equipment, improves the production efficiency of differential pressure casting, reduces the offline time of the aluminum supply equipment during the casting process, and ensures the continuity and high efficiency of casting production.

Description

Technical Field

[0001] The present invention belongs to the technical field of aluminum alloy casting, and particularly relates to an aluminum supply and heat preservation furnace for a differential pressure casting machine at the lower part. Background Art

[0002] During differential pressure casting, a sealing cover is placed outside the mold and filled with compressed gas to keep the mold under a certain gas pressure. When the molten metal is filled into the mold, the gas pressure in the heat preservation furnace is made greater than the gas pressure in the mold, so as to realize the filling, pressure holding and pressure boosting of the molten metal. The casting is crystallized and solidified under a higher pressure, so castings with higher density can be guaranteed. The aluminum alloy workpieces formed by casting can ensure uniformity and density, so as to provide higher mechanical properties while meeting the requirements of lightweight, and meet the use requirements of parts with complex stress. Therefore, it is widely used in the automotive manufacturing industry.

[0003] Limited by the traditional aluminum supply technology for differential pressure casting, the time for replacing the crucible during single aluminum supply is long; the thermal shock during replacement is large, and the service life of the aluminum supply equipment is short; the production cycle is long and the production efficiency is low; the crucible furnace needs to be replaced frequently, with a short service life and large equipment investment; at the same time, the heating method of the local heating wire along the cylinder wall of the traditional crucible furnace is radiative heating, with low heat transfer efficiency and large heat loss. All these factors restrict the further improvement and development of differential pressure casting production.

[0004] Therefore, there is an urgent need for a new technical solution in the existing technology to solve this problem. Summary of the Invention

[0005] In order to overcome the deficiencies of the existing technology, the present invention provides an aluminum supply and heat preservation furnace for a differential pressure casting machine at the lower part, which is used to solve the problems of short service life of the aluminum supply equipment, low production efficiency and low heat preservation efficiency caused by frequent thermal shock.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: an aluminum supply and heat preservation furnace for a differential pressure casting machine at the lower part, including a heat preservation furnace body; the heat preservation furnace body includes a heat insulation layer, a backing layer and a working layer, an aluminum liquid receiving port is opened in the upper part of the side wall of the heat preservation furnace body, and a horizontal immersion heating device is arranged near the bottom inside the heat preservation furnace body; a sealing structure is arranged outside the aluminum liquid receiving port.

[0007] The sealing structure includes a wedge surface, a tooth-engaging conical surface sealing cover, an annular sealing ring, a rotary pressing cylinder and a swing opening and closing cylinder; the rotary pressing cylinder is used to control the rotation of the annular sealing ring; the swing opening and closing cylinder controls the opening and closing of the tooth-engaging conical surface sealing cover through a swing arm.

[0008] Preferably, the working layer is a working layer of a high-density castable with a high silicon carbide content; the backing layer is a refractory backing layer based on fused quartz, and an anti-sticking aluminum additive for preventing the penetration of molten aluminum is additionally added to the backing layer; the heat insulation layer is a heat insulation layer made of a nano thermal insulation board.

[0009] Preferably, the horizontally placed immersion heater includes a heater body, an outer soft seal sleeve, a tapered plug, an inner soft seal, a core adjustment disc, a mounting flange, and a positioning component; the outer soft seal sleeve, the tapered plug, the inner soft seal, the core adjustment disc, the mounting flange, and the positioning component are sequentially sleeved on the heater body from the inside to the outside; the tapered plug is arranged inside the outer soft seal sleeve; the inner soft seal is arranged inside the tapered plug; the core adjustment disc includes a top abutting part and an adjustment part; one end of the top abutting part abuts against the inner soft seal, and the other end of the top abutting part is fixedly connected to the adjustment part; the adjustment part is provided with a plurality of through holes and blind holes; the mounting flange is provided with a plurality of threaded holes; the threaded holes are respectively arranged opposite to the positions of the through holes and the blind holes; the threaded holes arranged opposite to the through holes are filled with first bolts; the threaded holes arranged opposite to the blind holes are filled with second bolts; the threaded rod of the first bolt passes through the through hole and abuts against the tapered plug; the threaded rod of the second bolt abuts against the bottom of the blind hole.

[0010] Through the above design scheme, the present invention can bring the following beneficial effects:

[0011] 1. The holding furnace provided with the molten aluminum receiving port replaces the crucible furnace, can work under the differential pressure casting machine for a long time, and does not need to be replaced frequently; the waiting time in the production process is greatly reduced; the continuous operation ability of the equipment is improved, thereby improving the production capacity and economic benefits;

[0012] 2. The heating method of the local heating wire along the cylinder wall of the traditional crucible furnace is changed to a horizontally placed immersion heater, and the original radiation heating is changed to a heating method in direct contact with the molten aluminum. The heat transfer is more direct and effective, the thermal resistance is smaller, the heat loss is lower, the energy consumption ratio is improved, and the operation production cost is reduced;

[0013] 3. Because the holding furnace does not go offline for a long time, the lift pipe of the differential pressure casting machine and the relevant cooling detection equipment of the differential pressure machine cover will not be frequently subjected to thermal shock, thereby prolonging the service life of the core production supplies and greatly reducing the production cost;

[0014] 4. The holding furnace body includes a heat insulation layer, a backing layer, and a working layer. The layout and mechanism are reasonably set to ensure the strength and stiffness of the shell; at the same time, it has excellent compactness and stability and can effectively resist the erosion of molten aluminum; Description of the Drawings

[0015] Figure 1 It is a front sectional view of a molten aluminum supply holding furnace under a differential pressure casting machine of the present invention.

[0016] Figure 2 This is a C-C sectional view of the lower aluminum supply holding furnace of a differential pressure casting machine according to the present invention.

[0017] Figure 3 This is a view in the direction A of the lower aluminum supply holding furnace of a differential pressure casting machine according to the present invention.

[0018] Figure 4 This is a sectional view of the double-layer annular sealing ring of the lower aluminum supply holding furnace of a differential pressure casting machine according to the present invention.

[0019] Figure 5 This is a top view of the rotary pressing cylinder of the lower aluminum supply holding furnace of a differential pressure casting machine according to the present invention.

[0020] Figure 6 This is a sectional view of the position of the second bolt of the horizontally placed dipping heating device of the lower aluminum supply holding furnace of a differential pressure casting machine according to the present invention.

[0021] Figure 7 This is a sectional view of the position of the first bolt of the horizontally placed dipping heating device of the lower aluminum supply holding furnace of a differential pressure casting machine according to the present invention.

[0022] Figure 8 This is an outer view of the core adjustment disc of the horizontally placed dipping heating device of the lower aluminum supply holding furnace of a differential pressure casting machine according to the present invention.

[0023] In the figure, 1 is the holding furnace body, 101 is the heat insulation layer, 102 is the backing layer, 103 is the working layer, 2 is the molten aluminum receiving port, 3 is the horizontally placed dipping heating device, 31 is the heater body, 32 is the outer layer soft sealing sleeve, 33 is the tapered plug, 34 is the inner layer soft sealing member, 35 is the core adjustment disc, 351 is the abutting portion, 352 is the adjustment portion, 353 is the through hole, 354 is the blind hole, 36 is the mounting flange, 37 is the positioning member, 38 is the first bolt, 39 is the second bolt, 4 is the sealing structure, 41 is the wedge surface, 42 is the toothed tapered surface sealing cover, 43 is the annular sealing ring, 44 is the rotary pressing cylinder, 45 is the swing opening and closing cylinder, 46 is the swing arm. Detailed implementation manners

[0024] The following provides a detailed description of the specific implementation manners of the present invention in conjunction with the accompanying drawings.

[0025] It should be particularly noted that the terms "front and back, up and down, left and right" described in the text are only a simplified way of intuitively describing the positional relationship based on the drawings and do not limit the technical solution.

[0026] To illustrate the present invention more clearly, the following further describes the present invention in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive. Without departing from the inventive mechanism and scope set forth in the claims, users can make various changes to the following parameters. To avoid obscuring the essence of the present invention, well-known methods and processes are not described in detail.

[0027] As shown in the attached Figures 1 to 8 : A lower aluminum supply and heat preservation furnace for a differential pressure casting machine, including a heat preservation furnace body 1; the heat preservation furnace body 1 includes a heat insulation layer 101, a backing layer 102, and a working layer 103. An aluminum liquid receiving port 2 is opened in the upper part of the side wall of the heat preservation furnace body 1, and a horizontally arranged impregnation heating device 3 is arranged near the bottom inside the heat preservation furnace body 1; a sealing structure 4 is arranged outside the aluminum liquid receiving port 2;

[0028] The sealing structure 4 includes a wedge surface 41, a toothed conical surface sealing cover 42, an annular sealing ring 43, a rotary pressing cylinder 44, and a swing opening and closing cylinder 45; the rotary pressing cylinder 44 is used to control the rotation of the annular sealing ring 43; the swing opening and closing cylinder 45 controls the opening and closing of the toothed conical surface sealing cover 42 through a swing arm 46.

[0029] Furthermore, the working layer 103 is a working layer 103 made of silicon carbide castable. The innermost layer is the working layer, and a high-density castable with a relatively high silicon carbide content is selected. With the excellent wear resistance and thermal shock resistance of the silicon carbide material, the working layer has excellent denseness and stability, and can effectively resist the erosion of aluminum liquid;

[0030] Furthermore, the backing layer 102 is a refractory backing layer 102 based on fused quartz. It has good volume stability, can provide strong rigid support, ensure the stability of the refractory when the pressure is repeatedly applied, and at the same time add an anti-sticking aluminum additive to prevent the penetration of molten aluminum, so that it also serves as a safety barrier layer to avoid the impact on the body mechanism and the shell when the working layer is accidentally damaged, and improve the safety of the equipment;

[0031] Furthermore, the heat insulation layer 101 is a heat insulation layer 101 made of a nano thermal insulation board. The outermost layer uses a nano thermal insulation board as the heat insulation layer, which can effectively isolate the heat in the furnace, greatly reduce the heat dissipation of the furnace shell, and improve the energy utilization efficiency; protect the safety of personnel during operation.

[0032] The entire heat preservation furnace body 1 is a sealed pressure-bearing container. By selecting a suitable thickness of steel plate and reasonably arranging the layout and mechanism, the strength and stiffness of the shell are ensured; it can resist the deformation caused by the internal and external pressure difference during casting, and can work normally under the sealing pressing force of 100t applied by the differential pressure casting machine to the sealing upper cover;

[0033] Furthermore, the horizontally-mounted dipping heating device 3 includes a heater body 31, an outer soft sealing sleeve 32, a tapered plug 33, an inner soft seal 34, a core adjustment disc 35, a mounting flange 36, and a positioning component 37; the outer soft sealing sleeve 32, the tapered plug 33, the inner soft seal 34, the core adjustment disc 35, the mounting flange 36, and the positioning component 37 are sleeved on the heater body 31 in sequence from inside to outside; the tapered plug 33 is arranged inside the outer soft sealing sleeve 32; the inner soft seal 34 is arranged inside the tapered plug 33; the core adjustment disc 35 includes a top-leaning part 351 and an adjustment part 352; one end of the top-leaning part 351 leans against the inner soft seal 34, and the other end of the top-leaning part 351 is fixedly connected to the adjustment part 352; the adjustment part 352 is provided with a plurality of through holes 353 and blind holes 354; the mounting flange 36 is provided with a plurality of threaded holes 361; the threaded holes 361 are respectively arranged opposite to the positions of the through holes 353 and the blind holes 354; a first bolt 38 is installed in the threaded hole 361 opposite to the through hole 353; a second bolt 39 is installed in the threaded hole 361 opposite to the blind hole 354; the threaded rod of the first bolt 38 passes through the through hole 353 and leans against the tapered plug 33; the threaded rod of the second bolt 39 leans against the bottom of the blind hole 354.

[0034] Furthermore, there are four through holes 353, and the through holes 353 are evenly distributed along the circumferential direction of the adjustment part 352.

[0035] Furthermore, there are four blind holes 354, and the blind holes 354 are evenly distributed along the circumferential direction of the adjustment part 352.

[0036] The holding furnace is provided with a horizontally-mounted dipping heating device 3, which directly heats the molten aluminum by means of heat conduction during the casting process, and has the characteristics of high efficiency, fast heating, high system response speed, rapid temperature control accuracy, and delicate and stable temperature difference control; at the same time, since the heater body 31 does not contact media with low thermal conductivity such as air, the service life will not be reduced due to drastic changes in surface load; effectively reduce the impact of thermal shock, improve the service life of the heater, and reduce the maintenance and use cost of the equipment; because the horizontally-mounted installation hole is below the liquid level, leakage is likely to occur, resulting in production interruption and equipment damage; especially when there is a pressure difference between the furnace and the outside world, leakage is more likely to occur; the present invention adopts a tapered soft sealing structure between the heater and the furnace body, and through reasonable setting of the sealing layers, and by setting the core adjustment disc and the long and short bolts to adjust the inner and outer double-layer pressing respectively, the sealing of the heater body and the sealing of the installation tapered hole are tightly blocked; effectively withstand the pressure fluctuations generated during the production process.

[0037] In a specific implementation, the holding furnace is provided with a horizontal aluminum liquid receiving port 2, and a sealing structure 4 is provided at the end of the aluminum liquid receiving port 2 so that it can maintain a sealed state during the casting process; it can also be opened when the aluminum liquid is replenished to facilitate docking with the aluminum ladle;

[0038] The sealing structure 4 adopts a toothed clamp cone sealing structure, and the cylinder drives the rotating and pressing wedge surface 41 to provide the pressing force of the aluminum port; an annular labyrinth sealing structure is set at the sealing point, and a double-layer annular sealing ring is used to ensure the isolation of internal and external pressures;

[0039] The process of sealing opening and closing is jointly realized by the rotating clamping cylinder 44 and the swinging opening and closing cylinder 45; the rotating clamping cylinder 44 controls whether the toothed conical sealing cover 42 and the annular sealing ring 43 are overlapping or staggered by rotating the annular sealing ring 43. When overlapping, the toothed conical sealing cover 42 is in a fixed state, the degree of freedom is 0, and the toothed conical sealing cover 42 cannot be opened; when staggered, the circumferential toothed parts are staggered with each other, and there is no overlapping interference, so that the toothed conical sealing cover 42 can be driven by the swinging opening and closing cylinder 45 along the rotating shaft, leaving the sealing position, and realizing the opening and closing action.

[0040] The present invention improves the differential pressure casting performance from the perspective of aluminum supply equipment, increases the service life of the equipment, improves the differential pressure casting production efficiency, reduces the offline time of the aluminum supply equipment during the casting process, and ensures the continuity and efficiency of the casting production.

[0041] Obviously, the above described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A bottom-feeding aluminum holding furnace for a differential pressure casting machine, characterized in that: Comprising a holding furnace body (1); the holding furnace body (1) includes a heat insulation layer (101), a backing layer (102) and a working layer (103), an aluminum liquid receiving port (2) is opened at the upper part of the side wall of the holding furnace body (1), and a horizontally arranged dipping heating device (3) is arranged near the bottom inside the holding furnace body (1); a sealing structure (4) is arranged outside the aluminum liquid receiving port (2); The sealing structure (4) includes a wedge surface (41), a toothed conical surface sealing cover (42), an annular sealing ring (43), a rotary pressing cylinder (44) and a swing opening and closing cylinder (45); there are two wedge surfaces (41), the two wedge surfaces (41) are arranged oppositely, and the two wedge surfaces (41) are located between the toothed conical surface sealing cover (42) and the annular sealing ring (43); the rotary pressing cylinder (44) is used to control the rotation of the annular sealing ring (43); the swing opening and closing cylinder (45) controls the opening and closing of the toothed conical surface sealing cover (42) through a swing arm (46); The working layer (103) is a working layer (103) made of silicon carbide casting material; The horizontally arranged dipping heating device (3) includes a heater body (31), an outer layer soft sealing sleeve (32), a tapered plug (33), an inner layer soft sealing member (34), a core adjusting disc (35), a mounting flange (36) and a positioning member (37); the outer layer soft sealing sleeve (32), the tapered plug (33), the inner layer soft sealing member (34), the core adjusting disc (35), the mounting flange (36) and the positioning member (37) are sleeved on the heater body (31) in sequence from inside to outside; the tapered plug (33) is arranged inside the outer layer soft sealing sleeve (32); the inner layer soft sealing member (34) is arranged inside the tapered plug (33); the core adjusting disc (35) includes a top abutting part (351) and an adjusting part (352); one end of the top abutting part (351) abuts against the inner layer soft sealing member (34), and the other end of the top abutting part (351) is fixedly connected to the adjusting part (352); the adjusting part (352) is provided with a plurality of through holes (353) and blind holes (354); a plurality of threaded holes (361) are arranged on the mounting flange (36); the threaded holes (361) are respectively arranged opposite to the positions of the through holes (353) and the blind holes (354); a first bolt (38) is installed in the threaded hole (361) arranged opposite to the through hole (353); a second bolt (39) is installed in the threaded hole (361) arranged opposite to the blind hole (354); the threaded rod of the first bolt (38) passes through the through hole (353) and abuts against the tapered plug (33); the threaded rod of the second bolt (39) abuts against the bottom of the blind hole (354); There are four through holes (353), and the through holes (353) are evenly distributed along the circumferential direction of the adjusting part (352).

2. The under-furnace aluminum feeding and heat preservation furnace of a differential pressure casting machine according to claim 1, wherein: The backing layer (102) is a refractory backing layer (102) based on fused quartz, and an anti-sticking aluminum additive for preventing aluminum liquid penetration is additionally added to the backing layer (102).

3. The bottom aluminum supply and heat preservation furnace of a differential pressure casting machine according to claim 1, characterized in that: The heat insulation layer (101) is a heat insulation layer (101) made of a nano heat insulation board.

4. The under-furnace aluminum feeding and heat preservation furnace of a differential pressure casting machine according to claim 1, characterized in that: There are four of the blind holes (354), and the blind holes (354) are evenly distributed along the circumferential direction of the adjustment part (352).

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