CN209753940U

CN209753940U - Engine cast cylinder body thin-wall water jacket sand core

Info

Publication number: CN209753940U
Application number: CN201822024632.8U
Authority: CN
Inventors: 韦民; 赵永征; 黄光伟; 张京伟; 张伟光; 刘浩辉
Original assignee: Hefei Jac Casting Co Ltd
Current assignee: Hefei Jac Casting Co Ltd
Priority date: 2018-12-04
Filing date: 2018-12-04
Publication date: 2019-12-10
Anticipated expiration: 2028-12-04

Abstract

The utility model discloses a cylinder body thin wall water jacket psammitolite is cast to engine, cylinder body water jacket psammitolite includes the body, has adjacent first core and second core on the body, the centre bore position of cylinder body water jacket psammitolite is provided with annular core, annular core sets up in psammitolite centre bore bottom position, first core and the second core outside on the body are provided with L shape core, and L shape core links together first core and second core. The preparation method of the thin-wall water jacket sand core of the cast cylinder body of the engine is prepared by adopting a 100% jewel sand cold core method according to the mass parts. The water jacket sand core of the utility model is provided with the annular core head, which can effectively fill the hollow area at the bottom of the water jacket core; the L-shaped core head not only increases the structural strength of the local sand core, but also plays a role in protecting the body of the sand core. Through recent production statistics, the qualification rate is improved from original 95% to 100%, and the implementation effect is obvious.

Description

engine cast cylinder body thin-wall water jacket sand core

Technical Field

the utility model belongs to the technical field of the casting, especially, relate to an engine casting cylinder body thin wall water jacket psammitolite.

Background

With the stricter national fuel consumption regulations, in order to meet the target national fuel consumption value in the fourth stage (5L/100 km in 2020), the jianhuai automobile starts a green range plan from the perspective of strategic requirements, wherein the project of the traditional fuel saving technology based on the engine is included. According to the requirements of national laws and regulations and the requirements of company strategies, the Jianghuai automobile starts a product development project of a 1.2LTGDI three-cylinder engine and is matched with a Jianghuai small/medium-sized passenger vehicle.

as shown in figure 1, the structure of the water jacket sand core of the cast cylinder body of the 1.2LTGDI gasoline engine is shown schematically, and the water jacket sand core is characterized in that:

(1) Wall thickness of sand core: 5-7 mm;

(2) Contour dimension: 290mm in length, 145mm in width and 60mm in height;

(3) The whole body is annular and open;

(4) 7 sand outlets are distributed;

(5) The profile structure has large fluctuation and the parting surface is complicated.

The water jacket sand core of the cylinder body belongs to a typical thin-wall complex structure, and has the quality hidden troubles of difficult molding, low strength, easy deformation/fracture and the like in the preparation process.

in the prior art, a coated sand hot core preparation process is adopted, and the sand core has high overall strength and good vein resistance effect, but has the following defects: 1. the production cost is high; 2. the heating and curing time of the sand core is long, and the production efficiency is low; 3. the sand core has large gas evolution, is easy to cause air hole defects, and has higher design requirements on the exhaust system of the mould/core.

In the prior art, a technology of adding a chaplet is adopted, so that the strength is increased, the deformation of the annular sand core is prevented, and the following defects are also existed: 1. the core support has high manufacturing cost and poor universality; 2. after the core support is dip-coated with the water jacket core, the residual coating on the surface is easy to form cylinder hole sand holes, subcutaneous air holes and other defects, and special people need to be arranged for checking and cleaning the residual coating, so that the work is complicated; 3. in the pouring process, the hidden trouble of poor fusion between the metal chaplet and the casting exists, and the requirements on the melting point of the chaplet and the pouring problem are strict.

SUMMERY OF THE UTILITY MODEL

the utility model discloses just to prior art exist not enough, provide an oil gallery psammitolite of engine cylinder body casting.

In order to solve the above problems, the utility model adopts the following technical proposal:

The utility model provides an engine casts cylinder body thin wall water jacket psammitolite, cylinder body water jacket psammitolite includes the body, has adjacent first core and second core on the body, the centre bore position of cylinder body water jacket psammitolite is provided with annular core, annular core sets up the position in psammitolite centre bore bottom, first core and the second core outside on the body are provided with L shape core, and L shape core links together first core and second core.

As an improvement of the above technical solution, the annular core print includes a first step and a second step, the first step is in direct contact with the sand-in-water core, and the first step is higher than the second step.

Compared with the prior art, the utility model discloses an implement the effect as follows:

the water jacket sand core provided with the annular core head can effectively fill the hollow area at the bottom of the water jacket core, and plays roles in stabilizing the state and strengthening the structure; the L-shaped core head not only increases the structural strength of the local sand core, but also plays a role in protecting the body of the sand core. In addition, the integral core print is designed, so that a larger plane space is provided, a large-size exhaust needle is conveniently added on the outer die, and the exhaust effect is improved. The water jacket sand core is prepared by adopting a 40-70-mesh 100% jewel sand cold core process, the qualification rate is improved from original 95% to 100% through recent production statistics, and the implementation effect is obvious.

Drawings

FIG. 1 is a schematic diagram of a structure of a water jacket sand core of a cylinder block in the background art;

FIG. 2 is a schematic structural view (partial) of the cylinder body water jacket sand core with the annular core head of the present invention;

FIG. 3 is a schematic structural view of the cylinder body water jacket sand core with the L-shaped core head of the present invention;

FIG. 4 shows a quality trend chart (production number 450) of the cast cylinder body by using the water jacket sand core preparation process of the utility model.

Detailed Description

the present invention will be described with reference to specific embodiments.

Fig. 1 is a schematic diagram of a structure of a water jacket core of a cylinder block in the background art. The cylinder block water jacket sand core comprises a body 10, and a first core print 11 and a second core print 12 which are arranged at adjacent positions on the body 10.

As shown in FIG. 2, it is a schematic structural diagram of the cylinder body water jacket sand core with the annular core head of the present invention. Cylinder body water jacket psammitolite is provided with annular core head 20 in psammitolite centre bore position, annular core head 20 sets up in psammitolite centre bore bottom position, accelerates the cooling of bottom position like this.

The annular core print 20 includes a first step 21 and a second step 22, the first step 21 being in direct contact with the sand box core, and the first step 21 being higher than the second step 22. Since the first step 21 is in direct contact with the sand core, the temperature is higher, and therefore a larger area of heat dissipation is required, so that the adoption of the stepped annular core print 20 not only reduces the manufacturing cost, but also makes more effective use of the structure thereof for heat dissipation. Have annular core head, can effectively fill the cavity region of water jacket core bottom, play the effect that stable in state and structure are strengthened.

As shown in FIG. 3, it is a schematic structural diagram of the cylinder body water jacket sand core with the L-shaped core head of the present invention. Cylinder body water jacket psammitolite has first core print 11 and the second core print 12 of adjacent position on body 10, is provided with L shape core print 30 in first core print 11 and the outside of second core print 12, and L shape core print 30 links together first core print 11 and second core print 12. The L-shaped core head 30 not only increases the structural strength of the local sand core, but also protects the body 10 of the sand core. In addition, the integral core print is designed, so that a larger plane space is provided, a large-size exhaust needle is conveniently added on the outer die, and the exhaust effect is improved.

The utility model discloses a cylinder body water jacket psammitolite, its preparation technology is as follows:

the utility model adopts precious pearl sand or silica sand to mold the water jacket sand core of the cylinder body,

According to the performance parameter comparison table, the jewel sand has higher refractoriness and very small thermal expansion rate, the high-temperature deformation amount of the thin-wall water jacket sand core can be effectively reduced, the generation of vein is inhibited, and the reliable guarantee is provided for improving the size precision and the cleanliness of the inner cavity of the casting. In addition, compared with the sharp-angled silica sand, the spherical precious pearl sand has smaller surface area under the condition of the same volume, so that the consumption of resin in the cold core process is relatively lower.

In production practice, in order to reduce the manufacturing cost as much as possible, a cold core method preparation process of 100% of silica sand, 50% of Baozhu sand and 50% of silica sand, 80% of Baozhu sand and 20% of silica sand and 100% of Baozhu sand is adopted in sequence according to the mass part ratio. The correlation properties are compared as follows.

Through the practical comparison, under the condition of comprehensively considering the production cost and the rework cost, the 1.2LTGDI casting cylinder body water jacket sand core is prepared by adopting a 40-70-mesh 100% baozhu sand cold core process.

The foregoing is a detailed description of the invention in connection with specific embodiments thereof, and it is not intended that the invention be limited to these specific embodiments. To the utility model belongs to the technical field of technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses the scope of protection.

Claims

1. The utility model provides an engine casting cylinder body thin wall water jacket psammitolite, water jacket psammitolite includes body (10), has adjacent first core print (11) and second core print (12) on body (10), characterized by, the centre bore position of water jacket psammitolite is provided with annular core print (20), annular core print (20) set up in psammitolite centre bore bottom position, first core print (11) and second core print (12) outside on body (10) are provided with L shape core print (30), and L shape core print (30) link together first core print (11) and second core print (12).

2. The thin-walled water jacket core of an engine cast block as claimed in claim 1 wherein the annular core print (20) includes a first step (21) and a second step (22), the first step (21) being in direct contact with the water jacket core and the first step (21) being higher than the second step (22).