阅读说明：本技术 一种加热均匀的发动机缸体砂型铸造模具 (Engine cylinder sand casting mould with uniform heating ) 是由 黄波 于 2019-12-11 设计创作，主要内容包括：本发明公开了一种加热均匀的发动机缸体砂型铸造模具,属于发动机缸体砂型铸造模具领域,包括上模和下模；所述上模和下模相合并,其内部形成空腔；所述上模上设有若干个射砂孔,所述射砂孔用于向空腔注入型砂；所述上模下表面设有若干个吊块,所述吊块用于型砂造型；所述上模和/或下模的侧面设有横向加热孔；所述横向加热孔用于插入横向加热棒,给型砂加热；所述上模上设有纵向伸入吊块的纵向加热孔；所述纵向加热孔为盲孔,用于插入纵向加热棒,给吊块均匀快速加热。本发明的一种加热均匀的发动机缸体砂型铸造模具,解决传统缸体砂型铸造模具给型砂加热时受热不均,造成型砂易烤糊的问题。(The invention discloses an engine cylinder sand casting mold with uniform heating, belonging to the field of engine cylinder sand casting molds, and comprising an upper mold and a lower mold; the upper die and the lower die are combined, and a cavity is formed inside the upper die and the lower die; the upper die is provided with a plurality of sand shooting holes, and the sand shooting holes are used for injecting molding sand into the cavity; the lower surface of the upper die is provided with a plurality of hanging blocks, and the hanging blocks are used for molding sand; the side surface of the upper die and/or the lower die is/are provided with transverse heating holes; the transverse heating holes are used for inserting transverse heating rods to heat the molding sand; the upper die is provided with a longitudinal heating hole which longitudinally extends into the hanging block; the longitudinal heating hole is a blind hole and is used for inserting a longitudinal heating rod to uniformly and quickly heat the hanging block. The invention discloses a uniformly heated sand casting mould for an engine cylinder, which solves the problem that molding sand is easily burnt due to uneven heating when the molding sand is heated by a traditional sand casting mould for the engine cylinder.)

1. An engine cylinder sand casting mould with uniform heating comprises an upper mould (1) and a lower mould (2); the upper die (1) and the lower die (2) are combined, and a cavity is formed inside the upper die and the lower die; go up to be equipped with a plurality of on mould (1) and penetrate sand hole (11), penetrate sand hole (11) and be used for injecting the molding sand to the cavity, its characterized in that: the lower surface of the upper die (1) is provided with a plurality of hanging blocks (3), and the hanging blocks (3) are used for molding sand; the lateral surface of the upper die (1) and/or the lower die (2) is/are provided with a transverse heating hole (14); the transverse heating holes (14) are used for inserting transverse heating rods to heat the molding sand; the upper die (1) is provided with a longitudinal heating hole (15) which longitudinally extends into the hanging block (3); the longitudinal heating hole (15) is a blind hole and is used for inserting a longitudinal heating rod to uniformly and quickly heat the hanging block (3).

2. A uniformly heated engine block sand casting mold as in claim 1 wherein: a transverse groove (4) is formed in the upper surface of the upper die (1); the upper end of the longitudinal heating hole (15) is arranged on the transverse groove (4); the transverse groove (4) is used for accommodating the head of the longitudinal heating rod.

3. A uniformly heated engine block sand casting mold as in claim 2 wherein: the transverse groove (4) extends to the side face of the upper die (1) to form a side face opening (41) of the upper die (1).

4. A uniformly heated engine block sand casting mold as in claim 3 wherein: the transverse groove (4) comprises a step surface (42) and a bottom surface (43); a plurality of threaded holes (44) are formed in the step surface (42); one side of the bottom surface (43) is provided with an arc surface part (45) extending together with the transverse groove (4); the cambered surface part (45) is used for supporting a power line of the longitudinal heating rod.

5. A uniformly heated engine block sand casting mold as in claim 1 wherein: the hanging block (3) is correspondingly provided with one longitudinal heating hole (15), or two longitudinal heating holes (15) or at least three longitudinal heating holes (15); the number of the longitudinal heating holes (15) of all the hanging blocks (3) can be completely the same or partially the same or different.

6. A uniformly heated engine block sand casting mold as in claim 1 wherein: all the hanging blocks (3) and the upper die (1) are connected in a fully integrated forming mode or a fully detachable or partially detachable mode.

7. A uniformly heated engine block sand casting mold as in claim 6 wherein: the detachable hanging block (3) comprises a convex part (31) and an installation part (32); the lug boss (31) and the mounting part (32) are connected into a whole; the lower surface of the upper die (1) is provided with a groove part (12) matched with the mounting part (32); the mounting portion (32) is inserted into the groove portion (12) and fixed by a bolt.

8. A uniformly heated engine block sand casting mold as in claim 7 wherein: four threaded blind holes (33) are formed in the surface, matched with the groove part (12), of the mounting part (32); four through holes (13) penetrating through the upper die (1) are formed in the groove part (12); the four through holes (13) correspond to the four threaded blind holes (33) and are used for inserting bolts to fasten the detachable hanging block (3) and the upper die (1).

9. The uniformly heated sand casting mold for engine blocks as claimed in any one of claims 1 to 8, wherein: the sand shooting hole (11) avoids the hanging block (3) and leads to the cavity.

Technical Field

The invention belongs to the field of sand casting molds for engine cylinders, and particularly relates to a sand casting mold for an engine cylinder, which is uniformly heated.

Background

The production of the engine cylinder block castings belongs to the mass and specialized stream production property, the product structure is complex, the casting difficulty is high, the corresponding production procedures are multiple, the requirements of process equipment are high, and the complex inner cavity and appearance structure are realized, and the thin wall and high-precision blank size is also required.

The existing engine cylinder block type casting is cast by sand mold. Sand casting refers to a casting process that produces a casting in a sand mold. Steel, iron and most nonferrous metal castings can be obtained by sand casting. The molding material used for sand casting is cheap and easy to obtain, the casting mould is simple and convenient to manufacture, and the casting mould can adapt to single-piece production, batch production and mass production of castings, and is a basic process in casting production for a long time.

The method comprises the following steps that (1) a mould for manufacturing a sand mould is inevitably involved in sand mould casting, the mould comprises an upper mould and a lower mould, and various bulges and depressions are formed on the lower surface of the upper mould and the upper surface of the lower mould to mold molding sand; in order to better mold the molding sand, proper temperature needs to be provided for the molding sand, and it is common that heating holes are formed in the side surfaces of the upper die and the lower die and used for placing heating rods and adjusting the temperature of the molding sand; however, the heating arrangement mode often causes uneven heating of the molding sand, the molding sand close to the heating rod is easy to be burnt, the temperature of the molding sand far away from the heating rod is adjusted for a long time, the heating time of the sand mold for the engine cylinder body is more than five minutes, and the efficiency of batch production is seriously influenced; especially, the part with obvious bulge of the upper die is most obvious.

Disclosure of Invention

The invention aims to provide an engine cylinder sand casting mould which is uniformly heated aiming at the defects, and aims to solve the problem that the molding sand is easily burnt due to nonuniform heating when the molding sand is heated by the traditional cylinder sand casting mould. In order to achieve the purpose, the invention provides the following technical scheme:

a sand casting mould of an engine cylinder body with uniform heating comprises an upper mould and a lower mould; the upper die and the lower die are combined, and a cavity is formed inside the upper die and the lower die; the upper die is provided with a plurality of sand shooting holes, the sand shooting holes are used for injecting molding sand into the cavity, the lower surface of the upper die is provided with a plurality of hanging blocks, and the hanging blocks are used for molding the molding sand; the side surface of the upper die and/or the lower die is/are provided with transverse heating holes; the transverse heating holes are used for inserting transverse heating rods to heat the molding sand; the upper die is provided with a longitudinal heating hole which longitudinally extends into the hanging block; the longitudinal heating hole is a blind hole and is used for inserting a longitudinal heating rod to uniformly and quickly heat the hanging block. According to the structure, the molding sand is injected into the cavity formed by the combined upper die and lower die through the sand shooting hole, and the molding sand forms a shape attached to the hanging block; the molding sand is filled in the gaps among the hanging blocks; the transverse heating rod is inserted into the transverse heating hole to heat the molding sand, the molding sand of the transverse heating rod which is closer to the upper die is easier to be heated, and the problem that the whole sand mold is easy to be burnt due to uneven heating is solved; particularly, because of the structural requirements, the hanging block needs to be designed to be longitudinally deep, the molding sand at the deep position which is jointed with the hanging block is not easy to reach the temperature condition, and the time for the transverse heating rod to work is longer, so that the efficiency of batch production is seriously influenced; the upper die is provided with the longitudinal heating hole which longitudinally extends into the hanging block, and the longitudinal heating rod is inserted into the longitudinal heating hole, so that the hanging block can rapidly and uniformly transfer heat, the whole sand mold can be uniformly heated, the heating time of the sand mold for the engine cylinder body originally needs more than five minutes of heating, only one hundred and twenty seconds are needed at present, and the working efficiency is improved; the longitudinal heating hole is generally arranged at the center of the hanging block, so that the longitudinal heating hole is approximately close to the edge of the hanging block, and heat can be uniformly transferred; the upper die is provided with longitudinal heating holes which longitudinally extend into the hanging blocks, all the hanging blocks can extend into the longitudinal heating holes, and part of the hanging blocks can also extend into the longitudinal heating holes; for the hanging block with the deeper modeling depth, a longitudinal heating hole is generally arranged, for the hanging block with the shallower modeling depth, the transverse heating rod can generally uniformly heat the hanging block, and the hanging block can be selected not to be provided with the longitudinal heating hole.

Further, a transverse groove is formed in the upper surface of the upper die; the upper end of the longitudinal heating hole is arranged on the transverse groove; the transverse groove is used for accommodating the head of the longitudinal heating rod. According to the structure, the upper die is also provided with a cover plate which is pressed, and the head part of the longitudinal heating rod is accommodated in the transverse groove in order to prevent the longitudinal heating rod from being crushed.

Further, the transverse groove extends to the side face of the upper die to form a side face opening of the upper die. According to the structure, the side opening of the upper die can be used as an outlet from which a power line of the longitudinal heating rod is led out because the longitudinal heating rod needs to be electrified.

Further, the transverse groove comprises a step surface and a bottom surface; a plurality of threaded holes are formed in the step surface; one side of the bottom surface is provided with an arc surface part extending together with the transverse groove; the cambered surface part is used for supporting a power line of the longitudinal heating rod. According to the structure, the step surface is provided with a plurality of threaded holes for fixing the cover plate by bolts so that the cover plate is attached to the upper die; the power cord of vertical heating rod holds in the horizontal groove, and cambered surface portion is the cambered surface, supports the power cord and can not have destressing, also can not pressed by the apron and produce the electric leakage.

Furthermore, the hanging block is correspondingly provided with one longitudinal heating hole or two longitudinal heating holes or at least three longitudinal heating holes; the number of the longitudinal heating holes of all the hanging blocks can be completely the same or partially the same or different. According to the structure, the hanging block which needs to be provided with the longitudinal heating holes can be correspondingly provided with one longitudinal heating hole or two, three or more longitudinal heating holes, so that the hanging block can be uniformly heated; a plurality of longitudinal heating holes can be formed in the hanging block with the larger cross section, and one longitudinal heating hole can be formed in the hanging block with the small cross section; in consideration of structural strength, one large longitudinal heating hole of the hanging block can be arranged into a plurality of small longitudinal heating holes, so that the structural strength is higher; the number of longitudinal heating holes of each hanger block may be completely the same or partially the same or all different.

Furthermore, all the hanging blocks and the upper die are connected in a mode of being integrally formed or detachably connected or partially detachably connected. According to the structure, as the existing bulge or convex die and the upper die are integrally formed, when the distance required by the bulge or convex die is small during machining, the milling cutter cannot extend into the machining tool, the bulge or convex die is used as a detachable hanging block, and the hanging block is separately machined and then fixed on the lower surface of the upper die, so that the problem that the distance is small and the machining tool cannot be machined can be solved, and the integral rigidity of the die cannot be influenced; in addition, when the gaps among the hanging blocks are small, a large amount of molding sand is saved in batch production, and the cost is saved. All the hanging blocks and the upper die are connected in a fully integrated forming mode or a fully detachable connection mode or a partially detachable connection mode. Generally, for the hanging blocks with larger spacing, as the milling cutter can extend into the hanging blocks for processing, the milling cutter and the upper die can be made into an integrally formed connecting structure; for the hanging blocks with smaller space, the milling cutter can not extend into the hanging blocks to be machined, and the hanging blocks and the upper die can be made into a detachable connecting structure.

Further, the detachable hanging block comprises a convex part and an installation part; the lug boss and the mounting part are connected into a whole; the lower surface of the upper die is provided with a groove part matched with the mounting part; the mounting portion is inserted into the groove portion and fixed by a bolt. According to the structure, the installation part is inserted into the groove part and is fixed through the bolt, only the protruding part is exposed, and the molding sand modeling effect of the original integrally formed protrusion or male die is born.

Furthermore, four threaded blind holes are formed in the surface, matched with the groove part, of the mounting part; four through holes penetrating through the upper die are formed in the groove part; the four through holes correspond to the four threaded blind holes and are used for inserting bolts to fasten the detachable hanging block and the upper die. According to the structure, the four bolts enable the hanging block and the upper die to be fastened more firmly, the threaded blind holes enable the bolts not to penetrate through the convex parts, and the completeness of the shape of the convex parts is guaranteed. The section of the mounting part is non-circular, and the groove part is also non-circular; the circular section is easy to rotate when fixed, and once the mounting part rotates, the lug boss rotates; the projections are generally irregularly shaped and slight deflections affect the shape of the sand pattern.

Further, the sand shooting hole is communicated with the cavity by avoiding the hanging block. According to the structure, the gaps between the hanging blocks can be filled more easily, and the sand shooting holes are prevented from penetrating through the hanging blocks to influence the modeling.

The invention has the beneficial effects that:

1. the invention discloses a sand casting mold for an engine cylinder body, which is uniformly heated and comprises an upper mold and a lower mold; the upper die and the lower die are combined, and a cavity is formed inside the upper die and the lower die; the upper die is provided with a plurality of sand shooting holes, and the sand shooting holes are used for injecting molding sand into the cavity; the lower surface of the upper die is provided with a plurality of hanging blocks, and the hanging blocks are used for molding sand; the side surface of the upper die and/or the lower die is/are provided with transverse heating holes; the transverse heating holes are used for inserting transverse heating rods to heat the molding sand; the upper die is provided with a longitudinal heating hole which longitudinally extends into the hanging block; the longitudinal heating hole is a blind hole and is used for inserting a longitudinal heating rod to uniformly and quickly heat the hanging block. The invention discloses a uniformly heated sand casting mould for an engine cylinder, which solves the problem that molding sand is easily burnt due to uneven heating when the molding sand is heated by a traditional sand casting mould for the engine cylinder.

Drawings

FIG. 1 is a schematic front view of the upper and lower dies of the present invention after they are closed;

FIG. 2 is a schematic cross-sectional view of the upper and lower dies of the invention after they are closed;

FIG. 3 is a schematic three-dimensional structure of an upper mold of the present invention;

FIG. 4 is a schematic top view of the upper mold of the present invention;

FIG. 5 is a schematic left side view of the upper mold of the present invention;

FIG. 6 is a schematic diagram of the bottom three-dimensional structure of the upper mold of the present invention;

FIG. 7 is a schematic view of the present invention with the upper mold removed, the hanger block and the lower mold;

in the drawings: 1-upper die, 2-lower die, 11-sand shooting hole, 12-groove part, 13-through hole, 14-transverse heating hole, 15-longitudinal heating hole, 3-hanging block, 31-lug boss, 32-mounting part, 33-threaded blind hole, 4-transverse groove, 41-side opening, 42-step surface, 43-bottom surface, 44-threaded hole and 45-arc surface part.

Detailed Description

The present invention will be described in further detail below with reference to the drawings and the embodiments, but the present invention is not limited to the following examples.