CN214465921U - Cast-in camshaft and casting mold - Google Patents

Abstract

The utility model discloses an inlay casting camshaft and casting mould, inlay casting camshaft include the steel pipe, are provided with a plurality of cams on the steel pipe, and the cam fuses the layer with the steel pipe junction for metallurgy, and the steel pipe both ends are provided with the head end. The casting mold for preparing the cast-in camshaft comprises a first casting mold and a second casting mold, wherein a pouring opening is formed in the top of the casting mold, a first cavity is formed in the first casting mold and the second casting mold, the first cavity is matched with the steel pipe and penetrates through the casting mold, a plurality of second cavities are formed in the first casting mold and the second casting mold and are matched with the cam, a plurality of exhaust channels are formed in the first casting mold, the lower ends of the exhaust channels are communicated with the second cavities, and the pouring opening is communicated with the second cavities through the pouring channels. The utility model discloses simple structure, convenient to use, this camshaft have reached better heavy effect that subtracts, have improved the surface hardness of cam, have effectively solved among the prior art preparation cost height, use limited and subtract the relatively poor scheduling problem of heavy effect.

Description

Cast-in camshaft and casting mold

Technical Field

The utility model belongs to the technical field of the camshaft preparation, concretely relates to cast-in camshaft and casting mould.

Background

With the development of economy and the progress of society, energy conservation and environmental friendliness are inevitable and socially recognized. The method is particularly applied to various light-weight technologies and popularization and application of various technologies suitable for emission regulations in the automobile industry. Camshafts are no exception as an important part of the valve train of internal combustion engines.

Conventional camshafts are formed by integral casting or forging, with gray cast iron, ductile cast iron, or cast steel being common materials. Early camshafts were all solid, because some products were designed with central oil gallery holes or for weight reduction considerations, machined or cast hollow camshafts gradually appeared, but due to material and process limitations, the diameter of the holes could not be made too large, with weight reduction effects generally around 10% -15%. Although some casting companies have developed thin-walled cast camshaft technology, large-scale applications have not been seen. Secondly, due to the tightening of emission regulations, in-cylinder direct injection technology is more applied to internal combustion engines, and due to the increase of fuel injection pressure, stricter requirements are provided for cam materials for driving high-pressure oil pumps, the traditional cast iron cannot meet the index of surface contact stress, and most host factories adopt a mode of back-press mounting of bearing steel oil pump cams under the condition. In addition, foreign automobile enterprises develop a new process of the assembled camshaft earlier based on the background that the machining capacity of the automobile enterprises is strong and the casting industry is gradually eliminated, transferred and upgraded, and the technical characteristics are as follows: the journal part uses a precision cold-drawn steel pipe, the cam part uses bearing steel or powder metallurgy materials, and the two parts are connected together through interference connection, brazing or metallurgical fusion. The reasonable application of material performance is realized through the process, a better weight reduction effect is obtained, but the overall cost of the process is obviously higher than that of the traditional cast camshaft, and the application has certain limitation.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned not enough, the utility model provides an inlay casting camshaft and casting mould, simple structure, convenient to use, this camshaft have reached better subtracting heavy effect, have improved the surface hardness of cam, have effectively solved among the prior art preparation cost height, have used limited and subtract the relatively poor scheduling problem of heavy effect.

In order to achieve the above object, the present invention provides a technical solution for solving the technical problem: the utility model provides an inlay casting camshaft, includes the steel pipe, is provided with a plurality of cams on the steel pipe, and the cam is the metallurgical fusing layer with the steel pipe junction, and the steel pipe both ends are provided with the head end.

The utility model has the advantages that: the cast-in camshaft is characterized in that a plurality of cams are arranged on a steel pipe, head ends are arranged at two ends of the steel pipe, the whole steel pipe is used for replacing the shaft diameter and the shaft bottom of an assembled camshaft, the cams are cast iron, and a metallurgical fusion layer is formed at the joint of the cams and the steel pipe due to mutual thermal action during pouring, so that the cams and the steel pipe are integrated into a whole and are connected tightly and firmly; compared with the traditional cast camshaft, the use of the thin-wall steel pipe greatly reduces the weight of the camshaft, achieves better weight reduction level, realizes the additional effects of reducing the energy consumption of an industrial chain, shortening the processing flow, improving the working environment and the like, and simultaneously improves the surface hardness of the cam based on the optimized adjustment of chemical components and processes, thereby reducing the preparation cost of the camshaft, meeting the use requirement of the camshaft and having no negative influence on the performances of the camshaft, such as hardness, service life and the like; compared with an assembled camshaft, the cam poured by cast iron replaces a bearing steel forging blank, and the interference fit after precision machining is replaced by metallurgical smelting, so that the cost is obviously reduced.

Further, the head end is provided with a bolt hole for connecting the camshaft chain wheel.

The casting mold for preparing the cast-in camshaft comprises a first casting mold and a second casting mold which are matched with each other, a pouring opening is formed in the top of the casting mold, a first matched cavity is formed in the first casting mold and the second casting mold, the first cavity is matched with the steel pipe and penetrates through the casting mold, a plurality of second matched cavities are formed in the first casting mold and the second casting mold, the second cavity is matched with the cam, a plurality of exhaust channels are formed in the first casting mold, the lower ends of the exhaust channels are communicated with the second cavity, and the pouring opening is communicated with the second cavity through the pouring channels.

The beneficial effect of above-mentioned scheme is: during casting, the steel pipe is fully cleaned, organic matters and oxides which affect fusion are removed, then the steel pipe is placed in a first cavity of a casting mold, molten iron is introduced through a pouring opening and a pouring channel to fill a second cavity, a cam shape is formed in the second cavity, and meanwhile, a metallurgical fusion layer is formed due to mutual thermal action of the molten iron and the steel pipe, so that the cam and the steel pipe are integrated; the casting mold is a first casting mold and a second casting mold which are matched, the first casting mold and the second casting mold wrap the steel pipe and apply a certain mold closing force, and the parts of the casting mold except the cavity are tightly contacted with the steel pipe, so that molten iron is prevented from flowing in during pouring; the cam is formed by pouring the steel pipe which is pre-filled into the casting mold, the use of the steel pipe can achieve a good weight reduction effect, additional effects of reducing the energy consumption of an industrial chain, shortening the processing flow, improving the working environment and the like are achieved, compared with a conventional camshaft, the cam camshaft has the advantages that the cost is also remarkably reduced, and the application prospect is very wide.

Furthermore, the casting mould is a sand mould or a metal mould.

Drawings

FIG. 1 is a schematic view of an insert cast camshaft;

FIG. 2 is a schematic view of a mold for a casting mold;

FIG. 3 is a schematic view of a first mold;

FIG. 4 is a schematic view of a second mold;

wherein, 1, steel tube; 2. a cam; 3. a metallurgical fusion layer; 4. a first casting mold; 5. a second casting mold; 6. pouring a mouth; 7. a first cavity; 8. a second cavity; 9. an exhaust passage.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

The utility model discloses an embodiment, as shown in FIG. 1, provides an inlay casting camshaft, including steel pipe 1, be provided with a plurality of cams 2 on the steel pipe 1, cam 2 is the metallurgical fusing layer 3 with steel pipe 1 junction, and steel pipe 1 both ends are provided with the head end, are provided with the bolt hole of interlinkage camshaft sprocket on the head end.

The cast-in camshaft is characterized in that a plurality of cams 2 are arranged on a steel pipe 1, head ends are arranged at two ends of the steel pipe, the whole steel pipe 1 is used for replacing the shaft diameter and the shaft bottom of the assembled camshaft, the cams 2 are cast iron, and a metallurgical fusion layer 3 is formed at the joint of the cams 2 and the steel pipe 1 due to mutual thermal action during casting, so that the cams 2 and the steel pipe 1 are integrated into a whole and are tightly and firmly connected; compared with the traditional cast camshaft, the thin-wall steel pipe 1 greatly reduces the weight of the camshaft, achieves a better weight reduction level, realizes additional effects of reducing the energy consumption of an industrial chain, shortening the processing flow, improving the working environment and the like, and simultaneously improves the surface hardness of the cam 2 based on the optimized adjustment of chemical components and processes, thereby reducing the preparation cost of the camshaft, meeting the use requirement of the camshaft and having no negative influence on the performances of the camshaft, such as hardness, service life and the like; compared with an assembled camshaft, the cam 2 poured by cast iron replaces a bearing steel forging blank, and the interference fit after precision machining is replaced by metallurgical smelting, so that the cost is obviously reduced.

The casting mold for preparing the cast-in camshaft comprises a first casting mold 4 and a second casting mold 5 which are matched with each other, a pouring opening 6 is formed in the top of the casting mold, a first matched cavity 7 is formed in the first casting mold 4 and the second casting mold 5, the first cavity 7 is matched with the steel pipe 1, the first cavity 7 penetrates through the casting mold, a plurality of second matched cavities 8 are formed in the first casting mold 4 and the second casting mold 5, the second cavity 8 is matched with the cam 2, a plurality of exhaust channels 9 are formed in the first casting mold 4, the lower ends of the exhaust channels 9 are communicated with the second cavity 8, and the pouring opening 6 is communicated with the second cavity 8 through the pouring channels. The casting mould is a sand mould or a metal mould.

During casting, the steel pipe 1 is fully cleaned, organic matters and oxides which affect fusion are removed, then the steel pipe 1 is placed in a first cavity 7 of a casting mold, molten iron is introduced through a pouring opening 6 and a pouring channel to fill a second cavity 8, a cam 2 is formed in the second cavity 8, and meanwhile, a metallurgical fusion layer 3 is formed due to mutual thermal action of the molten iron and the steel pipe 1, so that the cam 2 and the steel pipe 1 are integrated; the casting mould is a first casting mould 4 and a second casting mould 5 which are matched, the steel pipe 1 is wrapped by the first casting mould and the second casting mould, a certain mold closing force is applied, and the parts of the casting mould except the second cavity 8 are tightly contacted with the steel pipe 1, so that molten iron is prevented from flowing in during pouring; the cam 2 is formed by pouring on the steel pipe 1 which is pre-loaded into the casting mold, the use of the steel pipe 1 can achieve good weight reduction effect, and the additional effects of reducing the energy consumption of an industrial chain, shortening the processing flow, improving the working environment and the like are realized, compared with the conventional camshaft, the cost is also obviously reduced, and the application prospect is very wide.

While the present invention has been described in detail and with reference to the accompanying drawings, it is not to be considered as limited to the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.

Claims (4)

1. The cast-in camshaft is characterized by comprising a steel pipe (1), wherein a plurality of cams (2) are arranged on the steel pipe (1), the connection part of the cams (2) and the steel pipe (1) is a metallurgical fusion layer (3), and head ends are arranged at two ends of the steel pipe (1).

2. The insert cast camshaft defined in claim 1, wherein the head end has bolt holes for linking camshaft sprockets.

3. A mold for producing the insert-cast camshaft claimed in any one of claims 1 to 2, it is characterized by comprising a first casting mold (4) and a second casting mold (5) which are matched with each other, a pouring opening (6) is formed in the top of the casting mould, a first matched cavity (7) is formed in the first casting mould (4) and the second casting mould (5), the first cavity (7) is matched with the steel pipe (1), the first die cavity (7) penetrates through the casting mould, a plurality of second die cavities (8) which are matched with each other are arranged on the first casting die (4) and the second casting die (5), the second die cavities (8) are matched with the cam (2), and a plurality of exhaust channels (9) are arranged on the first casting die (4), the lower ends of the exhaust channels (9) are communicated with the second cavity (8), and the pouring opening (6) is communicated with the second cavity (8) through a pouring channel.

4. A mold for producing an insert-cast camshaft according to claim 3, wherein the mold is a sand mold or a metal mold.

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