CN110918895A

CN110918895A - Low-cost vertical casting system of engine cylinder block

Info

Publication number: CN110918895A
Application number: CN201911271337.5A
Authority: CN
Inventors: 黄波
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-03-27

Abstract

The invention discloses a low-cost vertical casting system for an engine cylinder, which comprises a cylinder body sand mold, wherein a sprue is vertically arranged on a front end surface sand core or a rear end surface sand core of the cylinder body sand mold, the upper end of the sprue is matched with a sprue cup, the lower end of the sprue is communicated with a cross gate, the cross gate is arranged at the bottom of the cylinder body and is communicated with a cavity through an ingate, the cross gate comprises a cross gate A and a cross gate B, the cross gate A is parallel to the front end surface or the rear end surface of the cylinder body, the cross gate B is parallel to a suspension surface of the cylinder body, the sprue is communicated with the cross gate A, and two ends of the cross gate A are respectively communicated with the cross gate B. The low-cost vertical type pouring system for the engine cylinder block, provided by the invention, overcomes the defects of the existing vertical type pouring system in cost and technical effect by improving the existing vertical type pouring system and changing the arrangement and structure modes of a sprue and a cross sprue.

Description

Low-cost vertical casting system of engine cylinder block

Technical Field

The invention relates to the technical field of sand casting, in particular to a vertical pouring system for an engine cylinder body.

Background

The production of engine castings belongs to the mass and specialized flow production property, and generally the production outline of the year is reduced, namely tens of thousands of castings are produced, and the production outline of the year is increased by tens of millions of castings. The engine cylinder block is one of the most important parts in the engine, the size is large, the structure is complex, the wall thickness is thin and uneven, the requirement on the casting technology is high, and at present, for the production of the engine cylinder block, domestic casting enterprises mostly adopt horizontal pouring or vertical pouring processes for production.

Horizontal pouring is the most used pouring mode for horizontal pouring, and can be roughly divided into bottom pouring, top pouring, middle pouring and stepped according to the difference of water inlet positions of ingates of the horizontal pouring, the horizontal pouring is suitable for flow line production and is the most widely applied pouring mode, but due to the defects of the pouring principle, the horizontal pouring has technical bottlenecks for the high-end manufacturing and production of light weight and thin wall at present, and the thin-wall and light-weight production of cylinder bodies cannot be met.

The vertical pouring process is a new technology developed in the last 10 years, and is the biggest difference from horizontal pouring, wherein a sprue for vertical pouring is vertically arranged on a hanging surface of a cylinder body, and a cross runner is arranged at the bottom of the cylinder body.

However, the existing vertical pouring process still has more technical defects, mainly has the defects of large sand consumption and large smoke generation amount, the hardness difference of the obtained castings reaches +/-20 HB, the high-end manufacturing requirements of light weight and thin wall cannot be met, the fire accident is frequent, and the castings with casting defects in the same batch of produced castings have more castings and low yield, and the problems are explained in detail below.

Disclosure of Invention

The invention aims to: aiming at the existing problems, the low-cost vertical pouring system is mainly used for casting production of the automobile engine cylinder block, and the arrangement and the structural mode of a sprue and a cross sprue are changed through improving the existing vertical pouring system, so that the defects in the prior art are overcome.

The technical scheme adopted by the invention is as follows: the utility model provides a vertical gating system of low-cost engine cylinder body, includes the cylinder body sand mould, its characterized in that is provided with the sprue perpendicularly on the preceding terminal surface psammitolite of cylinder body sand mould or rear end face psammitolite, the lower extreme switch-on cross gate of sprue, the cross gate sets up in the bottom of cylinder body, and through ingate and die cavity switch-on, and the cross gate includes cross gate A and cross gate B, and cross gate A is parallel with the preceding terminal surface or the rear end face of cylinder body, and cross gate B is parallel with the hanging face of cylinder body, and the sprue switches on with cross gate A, and cross gate B is switched on respectively at cross gate A's both ends.

Further, the horizontal pouring gate A and the horizontal pouring gate B are both arranged on a bottom plate core of the cylinder body sand mold, and the mold closing gap of the vertical mold closing of the cylinder body sand mold is both positioned above the horizontal pouring gate A and the horizontal pouring gate B.

Further, the connection part of the sprue and the cross runner A is in smooth transition through an arc.

Further, the connection between the cross gate A and the cross gate B is in arc transition.

Further, the cross section of the runner a and/or the runner B is a circular arc rectangular cross section.

Further, the length dimension of the cross runner a is not smaller than the width dimension of the cylinder body.

Further, the cross runners B are symmetrically arranged on two sides of the bottom of the cylinder body, and the length of the cross runners B is not less than 2/3 of the length dimension of the cylinder body.

Further, a plurality of gates are provided in the runner B.

Furthermore, the connecting point of the sprue and the cross gate A is positioned at the midpoint of the cross gate A, and the distances between the cross gates B on two sides of the cylinder body and the midpoint of the cross gate A are equal.

Further, the upper opening of the sprue is larger than the lower opening in the axial direction of the sprue.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that: compared with the traditional suspension surface vertical pouring system, the front end surface vertical pouring system has obvious advantages in cost and technical effect, particularly, in the aspect of manufacturing cost, a manner of arranging a straight pouring gate on the front end surface is selected, so that the sand consumption can be greatly reduced, the weight of a sand mold is reduced, 63 yuan per box can be saved at least in the aspect of manufacturing cost, and only one item can save the manufacturing cost of 63 multiplied by 100000 to 630 ten thousand yuan for an enterprise according to the calculation of medium and small casting production enterprises producing hundred thousand engines every year; in the aspect of technical effects, the 'fire running' accident in the pouring process is effectively controlled, the obtained casting has few casting defects and high yield, the hardness difference of the casting is reduced to +/-10 HB, the requirement of modern high-end manufacturing is met, and a plurality of main technical problems of the existing suspension surface vertical pouring system are solved. The end face vertical pouring system has stronger practicability, and can effectively solve the problems of low technical quality, low production profit and serious pollution faced by the current engine casting enterprises.

Drawings

FIG. 1 is a schematic three-dimensional block diagram of a four-cylinder engine;

FIG. 2 is a schematic three-dimensional model structure of a vertical gating system of a conventional engine cylinder block;

FIG. 3 is a schematic front view of the structure of FIG. 2;

FIG. 4 is a side view schematic of the structure of FIG. 2;

FIG. 5 is a schematic top view of the structure of FIG. 2;

FIG. 6 is an exploded schematic view of a sand mold three-dimensional structure of a conventional engine block;

FIG. 7 is a cross-sectional view of a sprue structure of a vertical gating system for a conventional engine block;

FIG. 8 is a schematic three-dimensional model structure of the vertical gating system for the rear end face of the engine block of the present invention;

FIG. 9 is a schematic front view of the structure of FIG. 8;

FIG. 10 is a side view schematic of the structure of FIG. 8;

FIG. 11 is a schematic top view of the structure of FIG. 8;

FIG. 12 is an exploded schematic view of a three-dimensional structure of a vertical gating system for a front end face of a sand mold of an engine cylinder according to the present invention;

FIG. 13 is a cross-sectional view of the sprue structure of the vertical gating system of the front end face of the engine block of the present invention;

FIG. 14 is a schematic view of the runner configuration of the vertical gating system of the present invention;

fig. 15 is a schematic sectional view of a portion a-a in fig. 14.

The labels in the figure are: 1 is an upper end face, 2 is a left end face, 3 is a right end face, 4 is a front end face, 5 is a rear end face, 6 is a cylinder body, 7, 21 is a sprue, 8 is a first runner, 9 is a second runner, 10 is a bridge, 11 is a lap joint channel, 12, 24 are ingates, 13 is a lower end face, 14 is a riser core, 15 is a left profile, 16 is a right profile, 17 is a front end face sand core, 18 is a rear end face sand core, 19 is a bottom plate core, 20 is a mold close gap, 22 is a runner A, 23 is a runner B, 25 is a sprue cup, 26 is an arc lap joint channel, 27 is an arc transition part, L1 and L2 are farthest distances, and 28 is an arc rectangular section.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

First, the engine block sand mold generally includes six surfaces, as shown in fig. 1, an upper end surface of the engine block water jacket structure, which is located at the center of the engine block, is referred to as an upper end surface 1 of the block sand mold, and the sand mold at the upper end surface 1 is referred to as a riser core 14 because of being provided with a feeding head; the end surface of the bottom of the cylinder body sand core corresponding to the upper end surface 1 is called a lower end surface 13, and the sand mold at the lower end surface 13 is called a bottom plate core 19; the suspension surface at the air inlet side of the engine block is generally called a left end surface 2, the sand core at the left end surface 2 is generally called a left exterior 15, the suspension surface at the exhaust side corresponding to the left end surface 2 is generally called a right end surface 3, and the sand core at the right end surface 3 is generally called a right exterior 16; the remaining two end faces are referred to as front face 4 and rear face 5, respectively, and the sand molds are referred to as front face sand core 17 and rear face sand core 18, respectively, the end face designations of these engine blocks are common designations in the art, for example, reference may be made to the naming of the engine block in chinese utility model patent CN201620743471.6, which is consistent with the naming of the present invention, it is clear that these end face designations with directionality are merely for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the drawings of the present invention, a large number of model drawings of the gating system are applied, because each runner of the gating system is actually only a channel which is distributed in the sand mold of the cylinder body, and if the runner is directly shown by a structural diagram, the gating system cannot be completely shown, so the gating system is better described by means of the model drawings.

As shown in fig. 2 to 7, in the conventional vertical pouring system for the engine block, a sprue 7 is arranged at the left end face 2 of the engine block, the lower part of the sprue 7 is communicated with a runner, the runner comprises a first runner 8 and a second runner 9 which are arranged in parallel, the first runner 8 and the second runner 9 are respectively arranged on two length edges of the engine block, the first runner 8 and the second runner 9 are communicated through a bridge 10, the bridge 10 spans between the first runner 8 and the second runner 9, when the sprue 7 is communicated with the runner, the bridge 10 is required to be communicated with the same, therefore, a certain volume of overlapping channel 11 is needed to be arranged for connection, the size of the overlapping channel is generally 100 × 50 × 50mm, the first runner 8 and the second runner 9 are both provided with an inner sprue 12, and molten metal in the runners enters the cavity through the inner sprue 12. The pouring process of the conventional suspended surface vertical pouring system is roughly as follows: molten metal flows into the sprue 7 through the sprue cup, the molten metal in the sprue 7 enters the lap joint channel 11, the lap joint channel 11 buffers the impact of the molten metal, then the distributed molten metal simultaneously enters the first cross runner 8, the bridge 10 and the second cross runner 9, and then the molten metal enters the cavity through the ingates 12 on the first cross runner 8 and the second cross runner 9 to form a casting until the pouring is finished.

However, when the existing vertical gating system with the sprue arranged on the engine cylinder block suspension surface is analyzed, the existing vertical gating system has many design defects, and in practical application, the problem of exposure is not few, and the following analysis and explanation are performed on several main problems:

① sprue 7 location problem

The sprue 7 of the existing vertical gating system is arranged on the suspension surface of the engine cylinder body, generally on the left end surface 2 of the engine cylinder body, as shown in fig. 2, 6 and 7, the sprue 7 is arranged on the left outer shape 15, and along the axial direction of the sprue 7, the distance between the sprue 7 and the casting must be within a safe distance, otherwise, during the casting process, molten metal can burn through the sprue 7 to damage the sprue and further scrap the casting, generally, for the engine cylinder casting, the limit safe distance between the sprue 7 and the casting is about 300mm, according to the illustration in fig. 7, the lower part of the sprue 7 is closest to the casting, therefore, in order to ensure that the safe distance between the lower part of the sprue 7 and the casting is greater than 300mm, however, the sprue 7 is vertically arranged, and the volume of the casting is gradually reduced from bottom to top, the distance that leads to the well upper portion of sprue and foundry goods is more and more far away, the farthest distance L1 of sprue upper portion and foundry goods reaches more than 500mm, its unfavorable factor that brings is, there is a large amount of unnecessary sand volume between sprue 7 and the foundry goods, the molding sand is extravagant serious, the resin quantity is big, a large amount of molding sand is piled up the weight that can increase the psammitolite, make whole sand mould heavier, a large amount of gas that accumulational molding sand produced when being heated between sprue 7 and the foundry goods is difficult for discharging, and then lead to the foundry goods to appear casting defect.

② bridge 10 design has disadvantages

The bridge 10 is used for connecting the first runner 8 and the second runner 9, as shown in fig. 5, during casting, the molten metal in the sprue 7 firstly flows into the first runner 8 and the bridge 10, and the molten metal flows into the second runner 9 through the bridge 10, which results in a large temperature difference between the molten metal at the far end of the sprue 7 and the molten metal at the near end of the sprue 7, that is, the temperature difference between the molten metal at the nearest position of the first runner 8 from the overlap channel 11 and the temperature difference between the molten metal at the farthest position of the second runner 9 from the overlap channel 11 is large, so that the hardness difference of the obtained casting reaches ± 20HB, which cannot meet modern high-end manufacturing. Meanwhile, the gap bridge 10 is generally arranged on the bottom plate core 19, and has higher requirements on the sand core rigidity of the bottom plate core 19, the influence on the rigidity is large, the process requirement is high, the bottom plate core 19 needs to be thicker, and the manufacturing cost is high.

③ Lap channel 11 is bulky and problematic

The lap joint passage 11 is large in volume, and the volume is generally 100 multiplied by 50mm to 2500cm²When molten metal flowing out of the sprue 7 enters the lap joint channel 11, turbulence is large, air and slag in the sprue can be drawn into the molten metal, the effects of skimming and gas skimming cannot be achieved, casting defects are easily generated on castings, and the rejection rate is high.

④ has outstanding fire-out problem, high rejection rate and serious cost waste

As shown in FIG. 5, the runner of the pouring system is arranged above the mold closing gap 20, namely, above the mold closing gap 20 when the bottom plate core 19 is mold-closed with the left outer shape 15 and the right outer shape 16, the gap width of the mold closing gap 20 is between 0.3 mm and 0.6mm, the gravity pressure of the molten metal in the runner to the mold closing gap 20 is large during pouring, the molten metal flowing into the mold closing gap 20 is leaked out from the gap under heavy pressure, and then the running-out problem occurs, casting defects such as cold shut defects are generated due to the running-out problem of castings, the rejection rate is high, and the cost is seriously wasted.

Accordingly, to overcome the above-described deficiencies of conventional engine block vertical gating systems, the present invention improves upon this, as shown in figures 8-14, figures 8-14 show a vertical gating system with a sprue 21 provided in each of the front and rear faces 4 and 5 of the engine block, namely, a vertical casting system for an automobile engine block, comprising a sprue 21, a runner A22 and a runner B23, wherein the sprue 21 is provided on a front-face sand core 17 or a rear-face sand core 18, that is, the sprue 21 is provided at the front end face 4 or the rear end face 5 of the engine block, and the upper opening of the sprue 21 is larger than the lower opening thereof in the axial direction of the sprue 21, so as to ensure that the sprue 21 is always in a full state during the pouring process, otherwise, during pouring, negative pressure is formed at the bottom of the sprue 21, which causes air entrainment and casting defects. The lower end of the sprue 21 is communicated with a cross runner A22, the cross runner A22 is arranged in parallel with the front end face 4 or the rear end face 5 of the engine cylinder body, two ends of the cross runner A22 are respectively communicated with cross runners B23, the cross runners B23 are symmetrically and parallelly arranged on a hanging face of the engine cylinder body, namely, the number of the cross runners B23 is two, and the two cross runners B23 are respectively parallel with the length direction of the engine cylinder body. In the present invention, the sprue provided on the front end surface or the rear end surface of the engine block may be selected according to the actual situation.

The biggest difference between the vertical pouring system and the traditional vertical pouring system is as follows: the sprue 21 is provided on the front end face sand core 17 or the rear end face sand core 18, and this arrangement has an advantage that, as shown in fig. 13, fig. 13 shows a case where the sprue 21 is provided on the front end face of the engine block, and the distance between the sprue 21 and the casting is a certain value, about 300mm, that is, the farthest distance L2 is about 300mm, and there is no excess sand filling between them, which greatly reduces the sand consumption, and for a four-cylinder engine block, the left exterior 15 reduces the sand weight to 5KG, and the front end face sand core only increases the weight to 1KG, so that the resin consumption is greatly reduced, and the smoke generation is significantly reduced, which not only reduces the casting cost and the mold cost, but also greatly reduces the smoke amount, which is beneficial to green production, improves the production environment, facilitates the field operation of production workers, and reduces the atmospheric pollution.

The arrangement mode of the sprue 21 can be directly applied to a traditional vertical pouring system, and certainly, in order to further solve the problems of the traditional vertical pouring system, as shown in fig. 8-14, the horizontal runner comprises a horizontal runner A22 and a horizontal runner B23, and the design of the gap bridge 10 is cancelled, so that the molten metal in the sprue 21 can quickly reach the horizontal runner, the temperature difference of the molten metal in the horizontal runner is greatly shortened, the hardness difference of a cast obtained by pouring is obviously reduced, and experiments show that the hardness difference of a cylinder body of a four-cylinder engine obtained by original pouring is reduced from +/-20 HB to +/-10 HB, so that the high-end manufacturing requirement of a modern light-weight engine is met. Meanwhile, an overlarge overlapping channel is not required to be arranged between the sprue 21 and the cross gate, and a design mode of smooth transition of the sprue 21 and the cross gate is adopted, namely as shown in fig. 14, the sprue 21 and the cross gate A22 are communicated through the arc overlapping channel 26, the occupied volume of the arc overlapping channel 26 is very small and can be almost ignored, so that the problem that casting defects are easily generated on castings is avoided, and the yield is high. In addition, the design of the gap bridge 10 is eliminated, so that the pouring system meets the pouring requirement, the requirement on the rigidity of the bottom plate core 19 is greatly reduced, the bottom plate core 19 does not need to be thick, and the manufacturing cost is saved.

In the present invention, in order to better exert the function of the runner a22, the length dimension of the runner a22 is not smaller than the width dimension of the cylinder body, and preferably slightly larger than the width dimension of the cylinder body. Further, the length of the runner B23 is no less than 2/3 of the length dimension of the cylinder, preferably slightly greater than the length dimension of the cylinder.

In one embodiment of the present invention, the in-gates 24 are provided in the runners B23 in plural, typically 4 in-gates 24, i.e., 2 in-gates 24 per runner B23.

As an improved embodiment, in order to overcome the problem of "fire out" of the conventional gating system, in the gating system of the present invention, both the runner a22 and the runner B23 are disposed on the bottom plate core 19, that is, both the runner a22 and the runner B23 are disposed below the mold close gap 20, as shown in fig. 13, this arrangement can greatly reduce the metal hydraulic pressure at the mold close gap 20, that is, in the runner, the pressure above the metal liquid is lower than the pressure below the metal liquid, and the mold close gap 20 is disposed above the runner, so that the pressure applied to the metal liquid flowing into the mold close gap 20 is reduced, the leakage force is reduced, and the metal liquid in the mold close gap 20 flows slowly and is solidified quickly to block the mold close gap, thereby preventing the metal liquid from leaking from the mold close gap 20, and effectively reducing the occurrence rate of "fire out" accidents.

Further, in order to improve the skimming and air skimming effects of the gating system, in an improved embodiment of the invention, the connection between the runner a22 and the runner B23 is in arc transition, as shown in fig. 12, the runner a22 and the runner B23 are communicated through an arc transition part 27 with an arc structure, the runner a22 and the runner B23 jointly form a structure similar to a 'C', the bottom of the casting is integrally wrapped, when molten metal flows into the runner through the sprue 21, the molten metal flows stably due to the adoption of the arc transition structure, the resistance applied during turning is small, the turbulence degree is low, and then slag and air are not easy to be involved, so that excellent skimming and air skimming effects are achieved, the obtained casting has few defects and high yield.

In a preferred embodiment of the present invention, the cross section of the runner a22 and/or the runner B23 is a rectangular section, which has a smaller span than that of the circular arc section with the same cross-sectional area, and thus has a lower influence on the rigidity of the floor core 19, thereby facilitating the molding and manufacturing of the floor core 19. Further, to avoid the sharp corner configuration of a rectangular cross-section, the cross-section of the runner A22 and/or runner B23 is more preferably a rounded rectangular cross-section 28, as shown in FIG. 15, to avoid the adverse effects of a sharp corner configuration.

Further, as a preferred embodiment of the present invention, the connection point of the sprue 21 and the runner a22 is located at the midpoint of the runner a22, and the distances between the runners B23 on both sides of the cylinder and the midpoint of the runner a22 are equal, that is, the distances between the two runners B23 and the sprue are equal, so that the temperature difference can be reduced by ensuring that the temperatures of the metal liquids in the two runners B23 are approximately the same, and the hardness difference of the cast product after molding can be further reduced, which is favorable for casting a high-quality cast product.

Compared with the traditional suspension surface vertical pouring system, the front end surface vertical pouring system has obvious advantages in cost and technical effect, particularly, in the aspect of manufacturing cost, a mode of arranging a straight pouring channel on the front end surface or the rear end surface is selected, the sand consumption can be greatly reduced, the weight of a sand mold is reduced, 63 yuan per box can be saved at least in the aspect of manufacturing cost, and only one item can save the manufacturing cost of 63 multiplied by 100000-630 ten thousand yuan for an enterprise according to the middle and small-sized casting production enterprises producing hundred thousand engines every year; in the aspect of technical effects, the 'fire running' accident in the pouring process is effectively controlled, the obtained casting has few casting defects and high yield, the hardness difference of the casting is reduced to +/-10 HB, the requirement of modern high-end manufacturing is met, and a plurality of main technical problems of the existing suspension surface vertical pouring system are solved. The front end face vertical pouring system has stronger practicability, and can effectively solve the problems of low technical quality, low production profit and serious pollution faced by the current engine casting enterprises.

Obviously, the vertical gating system of the invention has little relation with the casting, so the vertical gating system is not only suitable for casting the engine cylinder block, but also suitable for casting other castings, for example, the vertical gating system can be used in any technical fields suitable for the vertical gating system, such as a cylinder cover, a valve body, a machine body and the like.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a vertical casting system of low-cost engine cylinder body, includes the cylinder body sand mould, its characterized in that, is provided with sprue (21) on preceding terminal surface sand core (17) or rear end face sand core (18) of cylinder body sand mould perpendicularly, and the lower extreme switch-on cross gate of sprue (21), the cross gate sets up in the bottom of cylinder body, and switches on with the die cavity through ingate (24), and the cross gate includes cross gate A (22) and cross gate B (23), and cross gate A (22) are parallel with preceding terminal surface (4) or rear end face (5) of cylinder body, and cross gate B (23) are parallel with the plane of hanging of cylinder body, and sprue (21) and cross gate A (22) switch-on, and cross gate B (23) are switched on respectively to the both ends of cross gate A (22).

2. The low-cost engine block vertical gating system according to claim 1, wherein the runner a (22) and the runner B (23) are both provided on a floor core (19) of the block sand mold, and the mold closing gap (20) of the up-and-down mold of the block sand mold is located above the runner a (22) and the runner B (23).

3. The low cost engine block vertical gating system according to claim 1, wherein the junction of the sprue (21) and the runner a (22) is smoothly transitioned through an arc.

4. The low cost engine block vertical gating system according to claim 3, wherein the junction between the runner A (22) and the runner B (23) transitions through an arc.

5. The low cost engine block vertical gating system according to claim 1, wherein the cross-section of the runner a (22) and/or the runner B (23) is a circular arc rectangular cross-section.

6. The low cost engine block vertical gating system according to any one of claims 1 to 5, wherein the length dimension of the runner A (22) is no less than the width dimension of the block.

7. The low-cost engine block vertical gating system according to claim 6, wherein the cross runner B (23) has two pieces which are symmetrically arranged on both sides of the bottom of the block, and the length of the cross runner B (23) is not less than 2/3 of the length dimension of the block.

8. The low-cost engine block vertical gating system according to claim 7, wherein the in-gate (24) is provided on the runner B (23), and the in-gate (24) has a plurality.

9. The low cost engine block vertical gating system according to claim 8, wherein the connection point of the sprue (21) and runner a (22) is located at the midpoint of the runner a (22), and the runners B (23) on both sides of the block are equidistant from the midpoint of the runner a (22).

10. The low-cost engine block vertical gating system according to claim 1, wherein an upper opening of the sprue (21) is larger than a lower opening in an axial direction of the sprue (21).