CN210547852U - Pouring system for lost foam casting camshaft - Google Patents
Pouring system for lost foam casting camshaft Download PDFInfo
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- CN210547852U CN210547852U CN201920961451.XU CN201920961451U CN210547852U CN 210547852 U CN210547852 U CN 210547852U CN 201920961451 U CN201920961451 U CN 201920961451U CN 210547852 U CN210547852 U CN 210547852U
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- sprue
- camshaft
- ingate
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Abstract
The utility model belongs to the technical field of the lost foam casting, a casting system for lost foam casting camshaft is related to, including pouring basin, sprue nest, cross gate, riser neck and rising head, pouring basin bottom is provided with filter equipment, the pouring basin setting at the top of sprue and with the sprue intercommunication, the sprue nest sets up in the bottom of sprue to one end intercommunication sprue, other end intercommunication cross gate, the cross gate is kept away from the one end that the sprue nest inserted to the camshaft die cavity and is interior runnerThe ingate is communicated with the camshaft cavity and guides molten metal to the camshaft cavity, the ingate is arranged at the position of a journal with the largest diameter cross section area of the camshaft, the riser is connected to the top end of the camshaft and is spherical, and the ratio of the ingate to the cross section area of the sprue is sigma SInner part∶∑SHorizontal bar∶∑SStraight barThe problem of insufficient slag resistance of a pouring system when the nodular cast iron camshaft is cast by the lost foam is solved as 1 to (1.2-1.3) to (1.4-1.9).
Description
Technical Field
The utility model belongs to the technical field of the lost foam casting, a casting system for lost foam casting camshaft is related to, especially relate to a casting system for lost foam casting camshaft suitable for nodular cast iron camshaft.
Background
The manufacturing process of the camshaft includes a casting method, a forging method and a combination method. When the traditional casting method is used for producing the camshaft, the design of a casting cavity is complex, the environmental pollution is large, and the capability of bearing alternating load of the cast iron camshaft is poor. The forged steel camshaft produced by the forging method has good load limit, but the processing cost is expensive, and the economic benefit is poor. The combined camshaft produced by using the combination method can effectively reduce the weight of parts, but the process is more complex, and the difficulty and risk of batch production are increased.
Due to the particularity of the camshaft structure, the lost foam casting method can effectively solve the problem in the manufacturing process of the camshaft. Lost foam casting is a negative pressure full mold casting method developed on the basis of a full mold casting method and a dry sand full mold casting method. The casting method is advanced and efficient, and meets the requirement of green production. The negative pressure exhaust method is adopted during casting, which is beneficial to filling the molten metal and can also control the treatment and discharge of waste gas. The foam pattern can be applied to greatly improve the production molding efficiency and the modeling efficiency of the camshaft. The foam pattern does not need to consider a parting surface and a mold taking, so that the camshaft casting cast by the lost foam has higher dimensional precision, and the machining time and cost are reduced. The method is almost unlimited in material, and both nodular cast iron and cast steel have applications.
But the design of the lost foam casting and pouring system of the nodular cast iron camshaft has certain particularity. For ductile iron, this material, the runner must have some slag-stopping properties. Considering the final gasification of the foam pattern in the lost foam casting, the pouring system for lost foam casting is simple, neat, stable and reliable, and is beneficial to gas discharge. The following problems are urgently to be solved in the prior art:
1. the improper selection of the type of the pouring system causes the liquid metal to flow unsmoothly or the flow velocity is too fast, thereby causing the defects of insufficient filling and the like;
2. the sectional area proportion of the pouring system is not designed properly, so that the slag resistance of the nodular cast iron is poor, the support performance during pouring is poor, and the yield is low;
3. the casting system is too complex in shape, the cost of the mold adopted by pre-foaming is high, the bonding manufacture of the mold is not facilitated, and the economy is poor.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses a solve the defect problem that exists when disappearance mould casting nodular cast iron oil pump camshaft among the prior art, provide a gating system for disappearance mould casting camshaft.
In order to achieve the purpose, the utility model provides a casting system for lost foam casting camshaft, including the pouring basin, the sprue nest, the cross gate, riser neck and rising head, pouring basin bottom is provided with filter equipment, the pouring basin sets up at the top of sprue and with the sprue intercommunication, the sprue nest sets up the bottom at the sprue, and one end intercommunication sprue, other end intercommunication cross gate, the cross gate is kept away from the sprue nest and is inserted the one end to the camshaft die cavity and be the ingate, the ingate is linked together with the camshaft die cavity and guides the molten metal to the camshaft die cavity, the ingate sets up in the biggest journal department of camshaft diameter cross-sectional area, the rising head is connected on the camshaft top, the rising head is spherical, the ratio of ingate: cross gate: the sprue cross-sectional area is sigma SInner part∶∑SHorizontal bar∶∑SStraight bar＝1∶(1.2The modulus of the spherical riser is the maximum under the same volume of 1.3: 1.4-1.9, and the feeding effect is the best.
Furthermore, the filtering device at the bottom of the pouring cup is an iron spacer or a filter screen.
further, the horizontal runner is in a long ladder shape with the width to height ratio of 1: 1.5-2, and the length L of the horizontal runner is determined by the following formula that L is K + α G + β H
Wherein, K-constant, the value of the camshaft casting is 120mm
α -correction factor, take 0.08
G-weight of single camshaft casting
β -correction factor, take 0.06
H-camshaft casting height.
Furthermore, the sprue is in a conical cylinder shape, the diameter of the large end of the sprue is 1-1.5 times of that of the small end, and the diameter of the sprue cup is equal to that of the large end of the sprue.
Further, a riser neck is connected between the riser and the camshaft.
Furthermore, the length of the ingate is 15 to 20mm, and the ratio of the width to the height of the ingate is 1: 1.
Further, the capacity of the sprue cup is 1.2 to 1.5 times of the sum of the volumes of the sprue and the sprue pit.
Furthermore, the sprue cup, the sprue pit, the cross gate, the riser neck and the riser are all made of polymethyl methacrylate-styrene copolymer resin (STMMA).
The beneficial effects of the utility model reside in that:
1. the utility model discloses a casting system for lost foam casting camshaft adopts closed casting system, and this casting system includes ingate, horizontal runner, sprue nest, pouring cup and rising head, and wherein the ratio of ingate: horizontal runner: sprue cross-sectional area is sigma SInner part∶∑SHorizontal bar∶∑SStraight barThe specific cross-sectional area ratio of each part is 1 to (1.2-1.3) to (1.4-1.9), so that the slag resistance of the pouring system to the nodular cast iron alloy can be improved.
The ingate adopts a trapezoidal ingate with the width-height ratio of 1: 1, and the ratio can ensure that the cooling speed of the metal liquid is not too high, so that the foam pattern is fully gasified and discharged. The ingate is arranged at the shaft neck with the largest diameter cross-sectional area of the camshaft, so that dead angles formed by the ingate are avoided, and uniform gasification of a pattern and sequential solidification of castings are facilitated. The transverse pouring gate adopts a long trapezoidal transverse pouring gate with the width-height ratio of 1: 2, and compared with a common flat transverse pouring gate, the long trapezoidal transverse pouring gate has good slag blocking performance, and can effectively relieve the problem of unsmooth ductile iron casting mold filling flow caused by the flat transverse pouring gate.
2. The utility model discloses a casting system for lost foam casting camshaft, sprue are the awl cylindricality, simplify molding structure, and gaseous discharge when being favorable to the pouring is simultaneously in the assembly of the camshaft foam pattern of being convenient for. The bottom of the pouring gate is provided with a cylindrical straight pouring pit. One or more cross runners can be connected with the straight pouring nests according to production requirements. Like this can realize the pouring of a plurality of camshaft die cavities simultaneously when connecting a plurality of runners, improve production efficiency.
The capacity of the sprue cup is larger than that of the sprue and is 1.2-1.5 times of the sum of the volumes of the sprue and the sprue pit, so that the defects of insufficient pouring and the like caused by too small volume of molten metal can be avoided. The bottom of the pouring cup is provided with an iron spacer or a filter screen, so that the slag resistance of the whole pouring system can be enhanced.
The dead head is a spherical dead head arranged at the top end of the camshaft, and compared with dead heads with other shapes, the spherical dead head has the largest modulus when the volumes are the same. Because the lost foam casting adopts a foam plastic pattern, the processing difficulty of the spherical riser is low.
3. The utility model discloses a gating system for lost foam casting camshaft, the gating system when having solved lost foam casting nodular cast iron camshaft hinders the not enough problem of sediment ability, compares with traditional mode of modelling, has simplified whole gating system's structure, has improved the figurative efficiency of foam pattern, stability and reliability when having promoted the pouring simultaneously, and the improvement camshaft production efficiency that a plurality of camshaft die cavities of connecting simultaneously through a horizontal runner carry out a plurality of simultaneous casting's method can be very big.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of an embodiment of a gating system for a lost foam casting camshaft according to the present invention;
FIG. 2 is a cross-sectional view of an ingate in an embodiment of a gating system for a lost foam casting camshaft according to the present invention;
fig. 3 is a cross-sectional view of a cross runner in an embodiment of a gating system for a lost foam cast camshaft according to the present invention.
Reference numerals: the sprue comprises a sprue cup 1, a sprue 2, a sprue pit 3, a cross runner 4, an ingate 5, a riser neck 6 and a riser 7.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
The pouring system for the lost foam casting camshaft shown in fig. 1 comprises a pouring cup 1, a sprue 2, a sprue pit 3, a cross runner 4, a riser neck 6 and a riser 7, wherein the pouring cup, the sprue pit, the cross runner, the riser neck and the riser are all made of polymethyl methacrylate-styrene copolymer resin (STMMA), and are subjected to vacuum prefoaming and curing. Finally, machining is used for manufacturing foam patterns of all parts. And then, adopting hot melt adhesive for bonding, connecting each straight pouring gate nest with four camshaft patterns through a horizontal pouring gate and an ingate, dip-coating water-soluble refractory coating after bonding, wherein the thickness is 1.5-2.0 mm, and the pouring system can be used after being stably placed and dried or hung and dried.
The pouring basin bottom sets up spacer filter equipment, the pouring basin sets up at the top of sprue and communicates with the sprue, the sprue nest sets up the bottom at the sprue, and one end intercommunication sprue, other end intercommunication cross gate, the cross gate is kept away from the sprue nest and is inserted the one end of camshaft die cavity and be ingate 5, ingate 5 is linked together with the camshaft die cavity and guides the molten metal to the camshaft die cavity, the ingate sets up in the biggest axle journal department of camshaft diameter cross-sectional area, the rising head is connected on the camshaft top, the rising head is spherical.
The concrete design principle of the gating system is as follows:
the type of gating system used being of the closed type, i.e. SMouth piece＞∑SStraight bar＞∑SHorizontal bar＞∑SInner part. Wherein S isMouth piece、SStraight bar、SHorizontal barAnd SInner partRepresenting the cross-sectional areas of the tundish, sprue, runner and ingate, respectively. The proportion of the sum of the cross sections of the respective portions employed in this embodiment is ∑ SInner part∶∑SHorizontal bar∶∑SStraight bar1: 1.2: 1.4. The cross-sectional area of the individual ingate is preferentially determined to calculate the cross-sectional area of the other portion. In order to ensure the rigidity and the support of a pouring system in the lost foam casting process, the cross section area of the inner pouring channel is enlarged by 1.3 times compared with that of the traditional sand casting. The specific cross-sectional area can be determined by referring to Table 1 and the cross-sectional area of each of the other runners can be estimated based on the above proportional relationship.
TABLE 1 determination of ingate Cross-sectional area
the cross-sectional shape of the ingate is a trapezoidal runner as shown in figure 2, the width and height ratio of the ingate is 1: 1, the length of the ingate is not longer and is 20mm, the cross-sectional shape of the cross runner is a slender trapezoidal runner as shown in figure 3, the width and height ratio is 1: 1.8, the length L of the cross runner is determined by the following formula, wherein L is K + α G + BetaH
Wherein, K-constant, the value of the iron casting is 120mm
α -correction factor, 0.08
G-weight of single camshaft casting
β -correction factor, 0.06
H-height of casting
The diameter of the small end of the sprue is obtained according to the proportional relation of all parts of the closed pouring system, and the diameter of the large end is 1.2 times of that of the small end. The height of the sprue is determined according to the pouring position and the sand-eating amount of the pattern. A cylindrical straight pouring pit is arranged below the straight pouring gate, and the diameter of the pit is the same as that of the big end of the straight pouring gate. The arrangement of the direct-pouring channel nest in lost foam casting has the following functions:
1. after the foam pattern is gasified, the high-temperature metal liquid can quickly occupy the cavity, and the direct pouring gate nest can prevent liquid turbulence and ensure stable filling;
2. when a box of various modeling designs are adopted, a plurality of transverse runners of the patterns can be bonded on the straight pouring gate nest, so that the production efficiency is improved, and the flow distribution of each transverse runner is improved.
A spacer is arranged in the pouring cup to improve the slag combining capacity of the pouring cup. The diameter of the sprue is equal to the diameter of the big end of the sprue. The capacity of the pouring cup is 1.2 times of the sum of the capacities of the sprue and the sprue pit. The spherical riser is arranged at the top end of the camshaft, and the sizes of the riser and the riser neck can be determined by a modulus method by using three-dimensional drawing software.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (8)
1. The utility model provides a disappearance is gating system for mould casting camshaft, a serial communication port, including the pouring basin, the sprue nest, the cross gate, riser neck and rising head, pouring basin bottom is provided with filter equipment, the pouring basin sets up at the top of sprue and communicates with the sprue, the sprue nest sets up the bottom at the sprue, and one end intercommunication sprue, other end intercommunication cross gate, the end that the sprue was kept away from the sprue nest and is inserted to the camshaft die cavity is the ingate, the ingate is linked together with the camshaft die cavity and guides the molten metal to the camshaft die cavity, the ingate sets up in the biggest journal department of camshaft diameter cross-sectional area, the rising head is connected at the camshaft top, the rising head is spherical, the ratio of ingate: cross gate: sprue cross-sectional area is sigma SInner part∶∑SHorizontal bar∶∑SStraight bar＝1∶(1.2～1.3)∶(1.4～1.9)。
2. The gating system for a lost foam cast camshaft of claim 1 wherein the filter means at the bottom of the tundish is an iron spacer or screen.
3. the gating system of claim 2, wherein the runner is a long ladder with a width to height ratio of 1 to (1.5-2), and the length L of the runner is determined by using the formula K + α G + β H
Wherein, K-constant, the value of the camshaft casting is 120mm
α -correction factor, take 0.08
G-weight of single camshaft casting
β -correction factor, take 0.06
H-camshaft casting height.
4. The gating system for a lost foam casting camshaft according to claim 3, wherein the sprue is in a conical cylinder shape, the diameter of the large end of the sprue is 1 to 1.5 times that of the small end, and the diameter of the pouring cup is equal to that of the large end of the sprue.
5. The gating system for a lost foam cast camshaft of claim 4, wherein the riser neck is connected between the riser and the camshaft.
6. The gating system for a lost foam cast camshaft as claimed in claim 5, wherein the length of the ingate is 15 to 20mm, and the ratio of the width to the height of the ingate is 1: 1.
7. The gating system for a lost foam cast camshaft according to claim 6, wherein a capacity of the sprue cup is 1.2 to 1.5 times a sum of volumes of the sprue and the sprue pit.
8. The gating system of claim 7, wherein the sprue cup, the sprue cup, the runner pocket, the runner, the riser neck and the riser are all made of polymethyl methacrylate-styrene copolymer resin (STMMA).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920961451.XU CN210547852U (en) | 2019-06-24 | 2019-06-24 | Pouring system for lost foam casting camshaft |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920961451.XU CN210547852U (en) | 2019-06-24 | 2019-06-24 | Pouring system for lost foam casting camshaft |
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| CN210547852U true CN210547852U (en) | 2020-05-19 |
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| CN201920961451.XU Active CN210547852U (en) | 2019-06-24 | 2019-06-24 | Pouring system for lost foam casting camshaft |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110238347A (en) * | 2019-06-24 | 2019-09-17 | 天津忠旺铝业有限公司 | A kind of lost foam casting camshaft running gate system |
-
2019
- 2019-06-24 CN CN201920961451.XU patent/CN210547852U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110238347A (en) * | 2019-06-24 | 2019-09-17 | 天津忠旺铝业有限公司 | A kind of lost foam casting camshaft running gate system |
| CN110238347B (en) * | 2019-06-24 | 2024-04-09 | 天津忠旺铝业有限公司 | Casting system for lost foam casting cam shaft |
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Denomination of utility model: Gating system for lost foam casting camshaft Effective date of registration: 20210730 Granted publication date: 20200519 Pledgee: Bank of Harbin Co.,Ltd. Shenyang Branch Pledgor: TIANJIN ZHONGWANG ALUMINIUM INDUSTRY Co.,Ltd. Registration number: Y2021990000659 |