CN209935807U

CN209935807U - Sand mold for casting engine cylinder block

Info

Publication number: CN209935807U
Application number: CN201920451472.7U
Authority: CN
Inventors: 于桂超
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-03
Filing date: 2019-04-03
Publication date: 2020-01-14
Anticipated expiration: 2029-04-03

Abstract

A sand mould for casting an engine cylinder body comprises a main core 1, a water jacket core 2, a side sand core 3, a cap core 4 and a tappet core 5, wherein the main core 1 comprises a bottom crankshaft cavity core 11 and a cylindrical cylinder core 12 which is integrally formed with the crankshaft cavity core 11; the water jacket core 2 comprises a through hole and a first positioning piece 21 positioned on the side surface; the side sand core 3 comprises a second positioning piece 31 and a third positioning piece 32; the cap core 4 comprises a positioning hole 41 and a fourth positioning piece 42; the tappet rod core 5 is respectively connected with the cap core 4 and the crankshaft cavity core 11; the first positioning part 21 is matched with the third positioning part 32; the second positioning element 31 is matched with the fourth positioning element 42; the cylindrical cylinder core 12 of the main core 1 penetrates through the through hole of the water jacket sand core and is matched with the positioning hole 41. The utility model realizes the accurate positioning of the sand core and avoids the displacement of the sand core; the air exhaust is smooth; the iron liquid is stably filled.

Description

Sand mold for casting engine cylinder block

Technical Field

The present invention relates generally to the field of casting, and more particularly, to a sand mold for casting an engine cylinder block.

Background

The engine block is one of the main parts of the engine, and is generally obtained by a casting method due to the complicated structure.

In the casting process of the cylinder body, the quality of the casting is affected due to the gas generation of the sand core, gas slag carried by molten metal and the like. In the cylinder body assembly, particularly, the size of a cylinder core is larger, the existing cylinder core is thicker, the gas evolution is larger in the casting process, and the quality of a casting is reduced or waste products are generated due to unsmooth exhaust.

Due to the complexity of the cylinder body parts, the sand mold is also complex, particularly the water jacket sand core is thin and complex, and the process needs to be strictly controlled in the casting process. In the casting process, the density of the sand core is lower than that of molten iron, so that the shifting of the sand core is easily generated in the casting process, and the quality of a casting is influenced, and the sand core is required to be prevented from generating displacement in the casting process, so that the quality of a cast workpiece is influenced.

In addition, when the integral sand mold is adopted for casting, the process of the sand mold is complex and is not easy to maintain, a plurality of parts are adopted for core assembly method for casting, the requirement on the core making process is greatly reduced, however, when a plurality of sand cores are adopted for combination casting, the relative position relation among the sand cores needs to be ensured to be kept fixed, if displacement occurs among the sand cores, the quality of a cast workpiece can be prevented from being influenced, and a large amount of waste products can be generated by severers.

The sand mould with the core assembly convenient and fast to use and capable of achieving accurate positioning and smooth exhaust is a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The utility model solves the problem that the sand core is easy to float and displace; the problem of inaccurate positioning of relative positions among the sand cores is solved; the problem of unsmooth gas emission in the sand core is solved; the problem of the stationarity of the casting molten iron is solved.

In order to solve the problems, the utility model provides a sand mould for casting an engine cylinder body, which comprises a main core 1, a water jacket core 2, a side sand core 3, a cap core 4 and a tappet core 5, wherein the main core 1 comprises a bottom crankshaft cavity core 11 and a cylindrical cylinder barrel core 12 which is integrally formed with the crankshaft cavity core 11; the water jacket core 2 comprises a through hole and a first positioning piece 21 positioned on the side surface; the side sand core 3 comprises a second positioning piece 31 positioned at the top and a third positioning piece 32 positioned at one side close to the water jacket sand core; the cap core 4 comprises a positioning hole 41 and a fourth positioning piece 42; the tappet rod core 5 is respectively connected with the cap core 4 and the crankshaft cavity core 11; the first positioning part 21 is matched with the third positioning part 32; the second positioning element 31 is matched with the fourth positioning element 42; the cylindrical cylinder core 12 of the main core 1 penetrates through the through hole of the water jacket sand core and is matched with the positioning hole 41.

According to the utility model discloses an embodiment, include a plurality of capillary holes on 3 lateral walls of limit psammitolite for the exhaust.

According to the utility model discloses an embodiment, pre-buried blast pipe 13 in the main core 1, blast pipe 13 is including being main blast pipe 131 and two branch blast pipes 132 that "Y" style of calligraphy is connected, be provided with a plurality of suction nozzles on main blast pipe 131 and the branch blast pipe 132.

According to an embodiment of the present invention, the main core 1 further comprises a locking assembly 14, the locking assembly 14 is located on the crankshaft cavity core 11, for mutual positioning between the main cores 1.

According to an embodiment of the present invention, the first positioning member 21, the second positioning member 31, the third positioning member 32 and the fourth positioning member 42 are pre-embedded components.

According to an embodiment of the present invention, the first positioning member 21, the second positioning member 31, the third positioning member 32 and the fourth positioning member 42 are made of iron casting material which is tempered.

According to an embodiment of the present invention, the second positioning member 31 is a square table, and the fourth positioning member 42 is a square table-shaped groove.

According to the utility model discloses an embodiment, first setting element 21 is the arch of square platform, round platform or frustum, third setting element 32 be with first setting element 21 assorted is sunken or the hole.

According to the utility model discloses an embodiment, sand mould, still include and water 6, water 6 including runner part and horizontal runner part perpendicularly, the molten metal liquid outlet orientation of horizontal runner bent axle chamber core 11, water 6 and be the back runner for make molten metal liquid pour from bottom to top.

According to the utility model discloses an embodiment, bent axle chamber core 11 with the position that the export of horizontal pouring gate corresponds is provided with the chute 7.

The utility model accurately positions the mutual positions of the sand cores through the pre-embedded positioning pieces of the sand cores, and avoids the displacement of the sand cores during casting; the influence of gas generation of the sand core and gas slag of molten iron on the quality of a workpiece in the casting process is avoided through the capillary holes of the side sand core and the exhaust pipe arranged in the main core; through the setting of the slow-flow groove and the arrangement of the back pouring channel, the iron liquid is stable in filling, the iron liquid is solidified from bottom to top, the exhaust is smooth, and the compactness of the workpiece is enhanced.

Drawings

FIG. 1 is a schematic illustration of a sand mold for casting an engine block;

FIG. 2 is a schematic illustration of the location of a tappet core;

FIG. 3 is a schematic view of an exhaust pipe in the primary core;

FIG. 4 is a schematic view of the locking assembly; and

fig. 5 is a sectional view of the sand mold.

Detailed Description

The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like elements and techniques of the present invention so that advantages and features of the present invention may be more readily understood when implemented in a suitable environment. The following description is an embodiment of the present invention, and other embodiments related to the claims that are not explicitly described also fall within the scope of the claims.

FIG. 1 shows a schematic view of a sand mold for casting an engine block.

As shown in fig. 1, a sand mold for casting an engine cylinder block comprises a main core 1, a water jacket core 2, a side sand core 3, a cap core 4 and a tappet core 5, wherein the main core 1 comprises a bottom crankshaft cavity core 11 and a cylindrical cylinder core 12 which is integrally formed with the crankshaft cavity core 11; the water jacket core 2 comprises a through hole and a first positioning piece 21 positioned on the side surface; the side sand core 3 comprises a second positioning piece 31 positioned at the top and a third positioning piece 32 positioned at one side close to the water jacket sand core; the cap core 4 comprises a positioning hole 41 and a fourth positioning piece 42; the tappet rod core 5 is respectively connected with the cap core 4 and the crankshaft cavity core 11; the first positioning part 21 is matched with the third positioning part 32; the second positioning element 31 is matched with the fourth positioning element 42; the cylindrical cylinder core 12 of the main core 1 penetrates through the through hole of the water jacket sand core and is matched with the positioning hole 41.

All the components of the sand mould are molded and cored by adopting a precoated sand hot core box, and then all the components are assembled. The main cores 1 are assembled, for example, the positions of the four main cores 1 are fixed relative to each other, and then the water jacket core 2 is sleeved on the cylinder core 12. The inner diameter of the through hole of the water jacket core 2 is slightly larger than that of the cylinder barrel core 12, a gap between the water jacket core and the cylinder barrel core is a space for forming a cylinder barrel, and the inner diameter of the through hole of the water jacket core 2 and the outer diameter of the cylinder barrel core 12 can be adjusted according to casting requirements in the core manufacturing process.

And after the main core 1 and the water jacket core 2 are assembled, the side sand core 3 and the water jacket core 2 are assembled. In this embodiment, the two side sand cores 3 are symmetrically arranged, the third positioning element 32 of the side sand core 3 is matched with the first positioning element 21 of the water jacket core 2, for example, the third positioning element 32 is a cylindrical hole, the first positioning element 21 is matched with the cylindrical hole and protrudes out of the cylinder on the surface of the water jacket core 2, and the two positioning elements are tightly combined to form the accurate positioning of the water jacket core 2.

The positioning hole 41 of the cap core 4 is matched with the cylinder core 12 and sleeved at the top end of the cylinder core 12, so that the accurate positioning of the relative position between the cylinder cores 12 is realized. The fourth positioning part 42 of the cap core 4 is matched with the second positioning part 31 of the side sand core 3 and is tightly combined, so that the relative position of the cap core 4 is fixed, and the effect of positioning the cylinder core 12 can be better achieved.

Fig. 2 is a schematic back view of fig. 1, and shows specific positions of the tappet cores 5, the tappet cores 5 are located on the back of each cylinder core 12, and one end of the tappet core 5 is connected with the cap core 4, and the other end is connected with the crankshaft cavity core 11.

The main core 1, the water jacket core 2 and the tappet core 5 are manufactured by using precoated sand with less gas evolution, so that ventilation and cleaning of loose sand in a finished casting are facilitated.

The side sand core 3 positions the water jacket core 2 through the third positioning piece 32; the side sand core 3 is combined with the cap core 4 to position the cylinder core 12; the position between each part is relatively fixed in the sand mould, the condition that the sand core assembly displaces in the casting process is reduced, and the influence on the casting is reduced.

FIG. 3 shows a schematic view of the exhaust pipe in the primary core.

As shown in fig. 3, exhaust pipes 13 are embedded in the main core 1, the exhaust pipes 13 include a main exhaust pipe 131 and two branch exhaust pipes 132 connected in a Y shape, and a plurality of air intake nozzles are disposed on the main exhaust pipe 131 and the branch exhaust pipes 132.

The sand core is not reasonably discharged by gas generated by high temperature and gas slag contained in the molten metal, and the processing quality of the cylinder body is affected.

The exhaust pipe 13 is inverted Y-shaped, the main exhaust pipe 131 penetrates through the cylinder barrel core 12, the top outlet is higher than the top of the cylinder barrel core 12, the bottom extends to the crankshaft cavity core 11, and the branch exhaust pipes 132 are arranged inside the crankshaft cavity core 11. The exhaust pipe 13 may be an iron pipe subjected to tempering, which can perform exhaust on one hand and reinforce the cylinder core 12 on the other hand.

During casting operation, gas slag in the molten metal and gas in the sand core are discharged along the exhaust pipe 13, so that influence on the casting is avoided, and the quality of the casting is improved. On the other hand, the sand consumption of the main core 1 is reduced, so that the core manufacturing cost is greatly reduced.

The capillary holes in the side sand cores 3 can be adjusted according to the requirements of the casting process so as to adapt to different requirements.

Figure 4 shows a schematic view of the locking assembly.

As shown in fig. 4, the main core 1 further comprises a locking assembly 14, and the locking assembly 14 is located on the crankshaft cavity core 11 for positioning the main cores 1 with respect to each other.

The locking assemblies 14 are connected with each other to combine the main cores 1 together, so as to fix the mutual positions of the main cores 1. The top of the main core 1 is positioned through the cap core 4, the bottom of the main core 1 is positioned through the locking assembly 14, so that the main core 1 is accurately positioned, and the casting deformation caused by displacement in the casting process is avoided.

The locking component 14 is made of a metal material annealed after high-temperature calcination, is not easy to deform, and has a better positioning effect. For example, the nodular cast iron after tempering treatment has good strength, less deformation and a concave-convex structure after precision processing.

The first positioning piece 21, the second positioning piece 31, the third positioning piece 32 and the fourth positioning piece 42 are made of tempered iron casting materials.

According to an embodiment of the present invention, the vertical connection of the positioning connection portion between the components of the sand mold is positioned by using a frustum, for example, the second positioning member 31 is a square cone or a circular truncated cone, and the fourth positioning member 42 is a groove matched with the second positioning member 31; the lateral connection is positioned by a cylinder and a cylindrical hole, for example, the first positioning member 21 is a cylinder and the third positioning member 32 is a cylindrical hole. When assembling the sand mold, the second positioning part 31 and the fourth positioning part 42 can be tightly combined vertically by utilizing the dead weight of the cap sand, so that the assembly is more convenient and tighter, and similarly, when transversely assembling, the main cores 1 are more tightly combined.

First setting element 21 with third setting element 32 matches each other, adopts the frustum location, makes the locate effect better, and when the equipment sand mould, it is more convenient. Adopt the physique casting material through tempering treatment, avoided the condition of the psammitolite subassembly displacement that deformation brought on the one hand, on the other hand each setting element intensity is high, core assembly and core setting convenient and fast have improved production efficiency.

Figure 5 shows a cross-sectional view of a sand mould.

As shown in fig. 5, the sand mold further comprises a pouring gate 6, the pouring gate 6 comprises a vertical pouring gate part and a horizontal pouring gate part, a molten metal liquid outlet of the horizontal pouring gate faces the crankshaft cavity core 11, and the pouring gate 6 is a back pouring gate and is used for pouring molten metal liquid from bottom to top.

In fig. 5, the left drawing does not mark the molding box, and the right drawing is a sectional view along the direction a, and the casting riser is not marked in the drawing, the utility model discloses can adopt the riser structure among the prior art.

The utility model discloses a horizontal equipment psammitolite, vertical casting. The pouring gate 6 makes the molten metal liquid solidify from bottom to top in sequence, on one hand, the molten metal liquid is stably filled, on the other hand, the gas is smoothly exhausted in the casting process, and the quality of the casting is ensured.

The flow-buffering groove 7 guides the molten metal entering the sand mold, so that the impact on the sand core is reduced, the molten metal can be stably filled, and the casting quality is ensured.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

Claims

1. A sand mould for casting an engine cylinder body is characterized by comprising a main core (1), a water jacket core (2), a side sand core (3), a cap core (4) and a tappet core (5),

the main core (1) comprises a bottom crankshaft cavity core (11) and a cylindrical cylinder core (12) which is integrally formed with the crankshaft cavity core (11);

the water jacket core (2) comprises a through hole and a first positioning piece (21) positioned on the side surface;

the side sand core (3) comprises a second positioning piece (31) positioned at the top and a third positioning piece (32) positioned at one side close to the water jacket core;

the cap core (4) comprises a positioning hole (41) and a fourth positioning piece (42);

the tappet rod core (5) is respectively connected with the cap core (4) and the crankshaft cavity core (11);

the first positioning piece (21) is matched with the third positioning piece (32);

the second positioning piece (31) is matched with the fourth positioning piece (42);

the cylindrical cylinder core (12) of the main core (1) penetrates through the through hole of the water jacket core (2) and is matched with the positioning hole (41).

2. A sand mould according to claim 1, characterised in that the side sand core (3) includes a plurality of capillary openings in the side walls for venting air.

3. The sand mould according to claim 1, wherein the exhaust pipes (13) are embedded in the main core (1), the exhaust pipes (13) comprise a main exhaust pipe (131) and two branch exhaust pipes (132) which are connected in a Y shape, and a plurality of air inlet nozzles are arranged on the main exhaust pipe (131) and the branch exhaust pipes (132).

4. A sand mould according to claim 1, characterised in that the primary core (1) further comprises a locking assembly (14), which locking assembly (14) is located on the crankshaft cavity core (11) for mutual positioning of the primary cores (1).

5. A sand mould according to claim 1, characterised in that the first (21), second (31), third (32) and fourth (42) locating elements are pre-embedded components.

6. A sand mould according to claim 1, characterised in that the first positioning element (21), the second positioning element (31), the third positioning element (32) and the fourth positioning element (42) are of tempered ferrous casting material.

7. A sand mould according to claim 1, characterised in that the second locating member (31) is a square table and the fourth locating member (42) is a square table shaped recess.

8. A sand mould according to claim 1, characterised in that the first positioning element (21) is a protrusion of a square, truncated or truncated cone and the third positioning element (32) is a recess or hole matching the first positioning element (21).

9. A sand mould according to claim 1, further comprising a pouring channel (6), said pouring channel (6) comprising a vertical pouring channel portion and a horizontal pouring channel portion, the molten metal liquid outlet of said horizontal pouring channel being directed towards said crankshaft cavity core (11), said pouring channel (6) being a back pouring channel for the molten metal liquid to be poured from bottom to top.

10. A sand mould according to claim 9, characterised in that a relief groove (7) is provided in the crankshaft cavity core (11) at a position corresponding to the horizontal runner outlet.