CN209255761U - A kind of sand mold - Google Patents

Abstract

The utility model provides a kind of sand mold, produces for handwheel, the sand mold ontology including circular ring shape, and the sand mold body side of the circular ring shape is equipped with cylindrical sprue, and the sprue is communicated with the pouring cup of storage potting syrup, the transmission for potting syrup；Circular ring shape protrusion, the circular ring shape protrusion are shaped in the upper surface of the sand mold ontology, and the circular ring shape protrusion is used to form the sand core of handwheel；The edge of the circular ring shape sand mold ontology extends to form enclosing, between the enclosing and the outer circle of circular ring shape protrusion, forms casting circle, the sprue is communicated with casting circle；In the circular ring shape protrusion, equipped with the first several gates, the both ends of first gate connect with the inner circle of circular ring shape protrusion and outer circle respectively；Assist sand mold, it is described auxiliary sand mold lower surface be equipped with matched second gate of circular ring shape upper convex surface, and sand mold ontology and auxiliary sand mold between there are circular ring shape fuses.

Description

A kind of sand mold

Technical field

The utility model relates to handwheel manufacture production field more particularly to a kind of sand molds for handwheel production.

Background technique

In the prior art, the cirque structure on handwheel needs the individually lower fuse between two sand molds, on the one hand, be On the other hand sand core is the circular ring structure of periphery, so that handwheel is during manufacturing, fuse twice under needing increases casting Process；Meanwhile in the prior art, sand mold ontology fuse twice due under, therefore sand using amount is larger, and then when pouring injection sand, exist Penetrate the not firm defect of sand；Existing sand mold two sides can be poured simultaneously, be stack-type structure, and arenaceous shell is superimposed shape forming cavity, and arenaceous shell is Solid, thicker, at high cost with sand, core precoated sand is not easy to heat, and influences arenaceous shell intensity, and uncured precoated sand gas forming amount is big, Bleb defect is more.

Summary of the invention

The purpose of this utility model is to provide a kind of sand molds, produce for handwheel, and the sand mold passes through increased annulus Shape protrusion, saves lower fuse step, meanwhile, the casting circle of sand mold and be poured intracavitary realizations casting, matching assist sand mold with And annulus protrusion, arenaceous shell thickness become smaller, casting is convenient.

The technology that the utility model uses is:

A kind of sand mold is produced for handwheel, comprising:

The sand mold ontology of circular ring shape, the sand mold body side of the circular ring shape is equipped with cylindrical sprue, described directly to pour Road is communicated with the pouring cup of storage potting syrup, the transmission for potting syrup；

Circular ring shape protrusion, the circular ring shape protrusion are shaped in the upper surface of the sand mold ontology, and the circular ring shape is convex The sand core for being used to form handwheel is acted, the interior circular diameter of the circular ring shape protrusion is greater than the interior circular diameter of sand mold ontology, the annulus The outside diameter of shape protrusion is less than the outside diameter of sand mold ontology；

The edge of the circular ring shape sand mold ontology extends to form enclosing, the outer circle of the enclosing and the circular ring shape protrusion it Between, casting circle is formed, the sprue is communicated with casting circle；

In circular ring shape protrusion, equipped with the first several gates, the both ends of first gate respectively with annulus The inner circle and outer circle of shape protrusion connect；

Assist sand mold, it is described auxiliary sand mold lower surface be equipped with matched second gate of circular ring shape upper convex surface, And there are circular ring shape fuses between the sand mold ontology and auxiliary sand mold.

Further, the lower surface of the sand mold ontology is recessed towards the upper surface of sand mold ontology, forms recessed portion.In order to Arenaceous shell thickness is reduced, the lower surface of sand mold is recessed, and then save part arenaceous shell structure, arenaceous shell thickness becomes smaller, sand using amount is reduced, The heating efficiency of core precoated sand is improved, gas forming amount is reduced, improves casting treatment.

Further, the recessed portion is several, is separated between several recessed portions by the first reinforcing rib.Pass through One reinforcing rib, it is ensured that the connection after recess between structure avoids the junction of each recessed portion from being broken, and influences sand mold and uses the longevity Life.

Further, sand mold ontology lower surface middle position forms connection ring, first reinforcing rib one end and sand The outer circle of type ontology connects, and the other end is connect with the connection ring.Among sand mold ontology, increases connection ring, be sand mold interposition It is constant to set height, and the first reinforcing rib both sides, one end extends to most edge, and one end connects with intermediate connection ring, improves sand Intensity of the type middle position to both sides.

Further, the lower surface of the sand mold ontology is equipped with the boss that a circle protrudes from sand mold ontology, the boss Width be the connection ring half to three/.By increasing boss, convenient for being set to its matching on auxiliary sand mold Recessed circle so that when sand mold mould assembly, when the two connects, stability is improved.

Further, the recessed portion periphery is circular ring structure, and the circular ring structure is equipped with a circle fixed ring.Increase solid Determine ring, it is ensured that the stability of sand mold periphery when sand mold is processed, enhances the intensity of recessed portion periphery.

Further, several second reinforcing ribs, the both ends point of second reinforcing rib are equipped in each recessed portion It is not connect with the outer circle of the inner circle of the recessed portion and connection ring.It is wider inside recessed portion, at this point, potting syrup pass through and Sand mold mould assembly, recessed portion all can make weakened because thickness reduces, and the second reinforcing rib increases recessed portion well Intensity.

Further, the height of the circular ring shape protrusion is 55mm-72mm.For circular ring shape protrusion, if height is too Height influences the weight of entire sand mold, if height it is too low, before cannot achieve in sand mold fuse effect.

It further, further include fuse anchor point, using the center of circle of the sand mold ontology as center symmetric points, the fuse Anchor point and the sprue center symmetric setting are in the two sides of the sand mold ontology.Fuse anchor point is symmetrically set with sprue It sets, improves stability when lower core.

Further, the upper surface of the sprue is equipped with positioning convex platform.When the sprue of sand mold ontology is equipped with positioning When boss, the auxiliary pouring channel on sand mold is assisted, positioning concave ring can be increased with sprue corresponding position, it is fixed that positioning convex platform is caught in In the recessed circle in position, leakproofness when two running channel connections is realized.

Compared with prior art, the utility model has the beneficial effects that

In the utility model, the sand core that will be needed before is equipped on sand mold, and original in conjunction with auxiliary sand mold Sand mold is compared, and thickness is thinning, and sand mold assembling becomes sand mold from the single stack-type of structure and matches the shell mould being combined into, and is reduced and is used sand Amount, improves the quality of cast product.

Sand mold in the utility model only need to once play core in assembling, reduce sand core, when shell processed operates, less with one Platform equipment, shell efficiency processed improve, and when installation, descend fuse less, reduce process, efficiency raising.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of sand mold in the prior art；

Fig. 2 is the assembling figure of sand mold in the prior art；

Fig. 3 is the structural schematic diagram of sand core in the prior art；

Fig. 4 is one of the structural schematic diagram of sand mold ontology provided by the utility model；

Fig. 5 is the second structural representation of sand mold ontology provided by the utility model；

Fig. 6 is the usage state diagram of sand mold provided by the utility model；

Fig. 7 is the structural schematic diagram of auxiliary sand mold provided by the utility model；

In figure:

1, sand mold ontology；101, interstitial hole；2, sprue；3, circular ring shape protrusion；4, casting circle；5, the first gate；6, Assist sand mold；7, the second gate；8, circular ring shape fuse；9, recessed portion；10, the first reinforcing rib；11, connection ring；12, boss； 13, recessed circle；14, fixed ring；15, the second reinforcing rib；16, fuse anchor point；17, positioning convex platform；18, positioning concave ring；19, it assists Running channel；

100, sand mold；300, sand core.

Specific embodiment

The utility model is described in detail in each embodiment shown in reference to the accompanying drawing, but it should be stated that, These embodiments are not limitation of the utility model, those of ordinary skill in the art according to these embodiments made by function Energy, method or equivalent transformation or substitution in structure, belong within the protection scope of the utility model.

In the description of the present embodiment, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower", The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description the invention and simplifies description, rather than indicate Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand For the limitation to the invention.

In addition, term " first ", " second ", " third " etc. are used for description purposes only, it is not understood to indicate or imply Relative importance or the quantity for implicitly indicating indicated technical characteristic.The feature of " first ", " second " etc. is defined as a result, It can explicitly or implicitly include one or more of the features.In the description of the invention, unless otherwise indicated, The meaning of " plurality " is two or more.

Term " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to removable Connection is unloaded, or is integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be in Between medium be indirectly connected, can be the connection inside two elements.For the ordinary skill in the art, can pass through Concrete condition understands concrete meaning of the above-mentioned term in the invention.

Embodiment 1

Referring to shown in attached drawing 4-7, it should be noted that in the present embodiment, a kind of sand mold is produced for handwheel, packet The sand mold ontology 1 of circular ring shape is included, 1 side of sand mold ontology of the circular ring shape is equipped with cylindrical sprue 2, pours in sand mold assembling When note, sprue 2 is communicated with the pouring cup of storage potting syrup, and the molten metal of casting flows into the type of sand mold ontology by sprue 2 It is intracavitary, form casting.

In the present embodiment, in the upper surface of sand mold ontology 1, integrally formed with circular ring shape protrusion 3, circular ring shape protrusion 3 is used for The sand core for forming handwheel, is equivalent to sand core in the prior art, and when setting, the interior circular diameter of circular ring shape protrusion 3 is greater than sand mold sheet The interior circular diameter of body 1, the outside diameter of circular ring shape protrusion 3 are less than the outside diameter of sand mold ontology 1；Setting in this way, makes It obtains circular ring shape protrusion 3 to be located just in circular ring shape sand mold ontology 1, in use, ingenious cooperation.In order to form the external knot of handwheel Structure, i.e. annulus on the outside of handwheel in the present embodiment, extend to form enclosing at the edge of circular ring shape sand mold ontology 1, enclosing with it is described Between the outer circle of circular ring shape protrusion, casting circle 4 is formed, when casting, sprue 2 encloses 4 and communicates with being poured, potting syrup entrance, into And casting forms cirque structure in casting circle 4.For the connector in cooperation handwheel between inner and outer ring, the present embodiment is in circle On annular protrusion 3, equipped with the first several gates 5, the both ends of first gate 5 are respectively and in circular ring shape protrusion 3 Round and circular ring shape protrusion 3 outer circle connects；When setting, the first gate 5 can be three, and three the first gates 5 are in 120o Angle is distributed in circular ring shape protrusion 3.First gate 5 can be formed for two small gates, the width of each small gate For 44.6mmm or so.Wherein, the first gate 5 is used to form the spoke of casting, the spoke being equivalent on bicycle quick.

It further include auxiliary sand mold 6 in the present embodiment, the auxiliary sand mold 6 is poured for cooperating sand mold ontology 1 in sand mold When, form entire sand mold group with the assembling of sand mold ontology 1, realize casting, specifically, the lower surface of auxiliary sand mold 6 be equipped with Matched second gate 7 in circular ring shape 3 upper surfaces of protrusion, the second gate 7 and the first gate 5 cooperate, meanwhile, in order to seal 6 outside of outer circle and auxiliary sand mold of sand mold ontology 1, there are circular ring shape fuses 8 between sand mold ontology 1 and auxiliary sand mold 6.When So, in order to guarantee that the circulation of potting syrup is also set with auxiliary pouring channel 19 in the side of auxiliary sand mold, make with the cooperation of sprue 2 With,

Using the sand mold in the present embodiment, when assembling, circular ring shape fuse 8 is sheathed on the circular ring shape protrusion 3 of sand mold ontology 1 Outside, then auxiliary sand mold 6 is covered, forms sand mold group, is then poured, pouring between sand mold ontology 1 and auxiliary sand mold 6 It infuses intracavitary, first run product can be formed.

When being solid cylindrical body among handwheel product, since sand mold ontology 1 is circular ring structure, necessarily there is circle among it Hole flows into potting syrup in circular hole by casting 4, first gate 5 of circle etc., inevitable in circular hole also to be poured to form solid circle Cylinder, and cylindrical body is connect by connector with external circle, and hand wheel structure as shown in the figure is formed.

Referring to shown in attached drawing 1-3, in the prior art, 3 parts of valve body drive sprocket sand mold point, firstly, 100 1 pairs of sand mold, There is apperance on stack-type, 100 two sides of sand mold, and two sand molds 100 are overlapped mutually to form a type chamber, sand mold 100 be it is solid, it is thicker, Sand using amount is big, at high cost with sand, and it is saturating that center portion precoated sand is not easy heat hardening, influences 100 intensity of sand mold, uncured precoated sand hair Large-minded, bleb defect is more.Secondly, the sand mold of the prior art, when preparing sprocket wheel, the two sides of sand mold 100 same first, Product can be formed, and then in first face over-assemble sand core 300 of sand mold 100, then assemble sub (the i.e. the application of outer circle tooth core In circular ring shape protrusion 3), then take out another sand mold 100, the second face of sand mold 100 with before with sand core 300 and circle First surface buckle of the sand mold 100 of annular protrusion 3 is closed, and the middle position of two sand molds 100 is poured, and casting forms product.

Using the sand mold in the present embodiment, firstly, shell mold technical operation is changed to by original stack-type technique on sand mould structure, I.e. original arenaceous shell forms, and is supported between upper layer and lower layer arenaceous shell with reinforcing rib, subtracts sand with type, and arenaceous shell thickness is thinned, and sand is used in reduction Amount reduces arenaceous shell and solidifies soaking time, reduce cost, improves shell efficiency processed, while it is straight on arenaceous shell to be able to achieve interstitial hole fuse Tape splicing goes out.Secondly, sand mold in structure, compared with prior art, removes sand core, it is only necessary to circular ring shape fuse 8, and then installing additional When few next fuse, reduce by a procedure, reduce sand using amount, reduce cost, improve efficiency.Again, shell and core sand mould Horizontal parting is changed to by vertical-parting, has prevented arenaceous shell and has penetrated not firm defect, improved the yield rate of arenaceous shell and blank.Specifically Ground, horizontal parting refers to that sand mold opens and closes up and down, divides upper die and lower die, and vertical-parting refers to sand mold opening and closing left and right, point left mould and the right side Mould dynamic model and cover half, opposite core shooter are also classified into vertical core shooter and horizontal core shooter.

Embodiment 2

Referring to shown in attached drawing 4-7, as the further improvement of embodiment 1, by the lower surface of sand mold ontology 1 in the present embodiment It is recessed towards the upper surface of sand mold ontology 1, forms recessed portion 9.Sand is eliminated so that the thickness of sand mold becomes smaller by recessed portion 9 A part of structure of type ontology 1 reduces sand using amount, improves the heating efficiency of core precoated sand, subtract so that arenaceous shell thickness becomes smaller Few gas forming amount improves casting treatment.

In the prior art, sand mold does not have recessed portion 9, is directly annulus consistency of thickness, so that structure bulky, gas forming amount is big, Therefore bleb defect also increases.

In the present embodiment, the recessed portion 9 is several, is uniformly distributed on the sand mold ontology 1 of circular ring shape, several It is separated between recessed portion 9 by the first reinforcing rib 10.Pass through the first reinforcing rib 10, it is ensured that the connection after recess between structure is kept away The junction fracture for exempting from each recessed portion 9, influences sand mold service life.

In the present embodiment, connection ring 11, and then the first reinforcing rib 10 1 also are formed in 1 lower surface middle position of sand mold ontology End is connect with the outer circle of sand mold ontology 1, and the other end is connect with the connection ring 11.It is originally a circle among sand mold ontology 1 Cylinder is laterally extended to form increased connection ring 11, on the one hand, sand in one end of cylindrical body, the i.e. lower surface of sand mold ontology 1 The middle position height of type ontology 1 is constant, and overall structure will not change, and on the other hand, 10 both sides of the first reinforcing rib, one end extends To the most edge of sand mold ontology 1, one end connects with intermediate connection ring 11, improve sand mold middle position to both sides intensity.

In the present embodiment, it is equipped with the boss 12 that a circle protrudes from sand mold ontology 1 in the lower surface of sand mold ontology 1, it is described convex The width of platform 12 be the connection ring half to three/.By increasing boss 12, convenient for being arranged on auxiliary sand mold 6 In its matched recessed circle 13, when so that sand mold molding, when the two connects, stability is improved.That is the increase of boss 12 and recessed circle 13, The leakproofness for improving sand mold molding, avoids middle position, and sand mold movement, matching is bad, so influence casting process with And casting structure.

Further, in this embodiment setting circular ring structure for 9 periphery of recessed portion, circular ring structure is equipped with a circle and fixes Ring 14.What recessed portion 9 was originally recessed, increase fixed ring 14, on the one hand, so that it is strong with 1 periphery linkage section of sand mold ontology Degree increases, on the other hand, it is ensured that the stability of sand mold periphery when sand mold is processed, enhances the intensity of 9 periphery of recessed portion.This implementation In example, recessed portion 9 is similar to circular ring structure, and inside is closely connect with the middle position of sand mold ontology 1, and outside needs and sand mold sheet It is ingenious at the outer circle of body 1 to be fastenedly connected, and circular ring structure is set by its periphery, the outer circle transition fit with sand mold ontology 1 Connection, improves practicability, while structure is relatively beautiful.

In the present embodiment, several second reinforcing ribs 15 are equipped in each recessed portion, second reinforcing rib 15 Both ends are connect with the outer circle of the inner circle of the recessed portion 9 and connection ring 11 respectively.The comparison that can be set inside recessed portion 9 Width, at this point, potting syrup, by sand mold and sand mold clamping process, recessed portion 9 all can make weakened because thickness reduces, It is more easily damaged, and the second reinforcing rib 15 increases the intensity of recessed portion 9 well, the width of the second reinforcing rib 15 can be set It is 1/10th of recessed portion 9, accounting is few, and quantity can be set as 3-5.

Embodiment 3

Referring to shown in attached drawing 4-7, as the further improvement of embodiment 1 or 2, in the present embodiment, circular ring shape protrusion 3 Height is 55mm-72mm.For circular ring shape protrusion 3, if height is too high, the weight of entire sand mold is influenced, if height is too It is low, before cannot achieve in sand mold fuse effect.Specifically, when handwheel is 1 inch, 1 " sprocket wheel be 58mm, 1.5 " It " is 65mm, 2.5 " be 70mm, 3 " be 70.5mm for 63mm, 2.

Wherein, what is 1 " indicated is an English inch, is that a kind of common English unit indicates and Writing method, i.e., when setting on handwheel There is a double wedge, and is highly 58mm when double wedge is an inch；Similarly, be 3 when be 70.5mm.

It further include fuse anchor point 16 in the present embodiment, it is described using the center of circle of the sand mold ontology 1 as center symmetric points Fuse anchor point 16 and 2 center symmetric setting of sprue are in the two sides of the sand mold ontology 1.Fuse anchor point 16 with directly pour Road 2 is symmetrical arranged, and improves stability when lower core.

Further, the lower surface of the sprue 2 is equipped with positioning convex platform 17.When the sprue 2 of sand mold ontology 1 is equipped with When positioning convex platform 17, the auxiliary pouring channel 19 on sand mold 6 is assisted, positioning concave ring 18 can be increased with 2 corresponding position of sprue, will be determined Position boss 17 is caught in positioning concave ring 18, realizes leakproofness when two running channel connections.At this point, it is suitble to the combination of multiple groups sand mold, this When need by the lower surface of sand mold ontology 1 with auxiliary sand mold 6 upper surface be in contact.

Embodiment 3

In the present embodiment, referring to shown in attached drawing 4-7, need to make WG sprocket wheel, the chain sprocket structure specifically manufactured is similar to hand Wheel, including upper and lower ring structure, ring structure inner circle is connected by clamping ring, and centre is equipped with leading truck mounting groove, leading truck Mounting groove is connect with ring structure by connector, and leading truck mounting groove includes the boss chamber positioned at cavity cylindrical body and centre Body.

In the present embodiment, using the sand mold of embodiment 2, sprocket wheel is prepared, with steps are as follows:

1, first it is well placed the lower fixture with steel plate.

Sand mold ontology 1 is put in fixture, the upper surface of sand mold ontology 1 upward, and the outer surface of sand mold ontology 1 is polished, and The fitting of fixture upper steel plate is tight, consolidates.

2, sand mold assembles: the mounting circular ring shape fuse 8 on sand mold ontology 1, and the positioning protrusion both ends of circular ring shape fuse 8 point It is not bumped into the positioning groove of sand mold ontology 1 and the fuse locating slot of auxiliary sand mold 6.

Auxiliary sand mold 6 on one is taken, tight sprue (i.e. stifled bottom) is blocked up with dedicated precoated sand insert, prevents from metalling run out.It will block up The auxiliary sand mold 6 at good bottom, overlays on the sand mold ontology 1 being placed on fixture, makes between sand mold ontology 1 and auxiliary sand mold The snap fastener that boss 12 and recessed circle 13 are formed coincide.

Wherein, a sand mold ontology 1 and auxiliary sand mold 6 one group of sand mold of formation with circular ring shape fuse 8, every group Sand mold forms a sprocket wheel casting, several groups sand mold can be arranged according to demand.At this point, sand mold assembling steps are repeated, it is straight only folded It is added to quota height, then one group of sand mold under placed on top, using the conical boss formation interstitial hole among lower arenaceous shell and outside Shape.

3, fixed sand mold: putting upper fixture, installs screw rod and tightens screw, several groups sand mold is fixed.

4, sand mold is poured, and foam ceramic filter is installed at the top of sprue, is installing sprue cup after burying case jolt ramming.

Potting syrup first flows into the casting circle 4 of 1 upper surface of sand mold ontology, through sprue 2 and auxiliary pouring channel 19 after afterflow Enter that casting type that the first gate 5 and the second gate 7 are formed is intracavitary and the interstitial hole 101 in 1 middle position of sand mold ontology in；

5, the formation of sprocket wheel product: after sand mold is poured, forming at least one sprocket wheel product, in the sprocket wheel product Between guide groove by being formed on interstitial hole 101, the outer ring of the sprocket wheel product is formed by casting circle 4, the outer ring of the sprocket wheel product It is formed with the coupling part of intermediate guide groove by the first gate 5, the second gate 7 and casting circle 4；

6, the taking-up of sprocket wheel product: after casting, sand mold after disassembly is fixed, by sand mold ontology 1, auxiliary sand mold 6 with And circular ring shape fuse 8 is dismantled, that is, can be taken off the sprocket wheel product.After the taking-up of sprocket wheel product is specifically, be poured, entire sand Type structure dismantles the fixed sand mold and screw rod installed additional, casting beam is placed on viberating knock-out machie, shake after sandbox keeps the temperature 2 hours The dynamic 3-6 minute knockout moon, casting exterior molding sand defeated and dispersed can fall off separation, expose casting, by sand mold ontology 1, assist sand mold 6 with And circular ring shape fuse 8 is dismantled, that is, can be taken off the casting beam of the sprocket wheel product.

It is less next sand core 300 among present fresh sand molding sand shell, is that the circular ring shape protrusion 3 on sand mold ontology 1 is formed Inner hole does not have to lower interstitial hole fuse, reduces sand using amount, reduces a core sand mould and a procedure.

In the present embodiment, sand ratio is 1.426, sand using amount 4.28Kg；Arenaceous shell thickness reduces, without installing loose piece of taking (i.e. double wedge), safe operation, work efficiency is high.

Comparative example

Referring to shown in attached drawing 1-3, above-mentioned WG sprocket wheel is manufactured simultaneously using the prior art, firstly, it is necessary to 100 1 pairs of sand mold, There is apperance on stack-type, 100 two sides of sand mold, and two sand molds 100 are overlapped mutually to form a type chamber, sand mold 100 be it is solid, it is thicker, Sand using amount is big, at high cost with sand, and it is saturating that center portion precoated sand is not easy heat hardening, influences 100 intensity of sand mold, uncured precoated sand hair Large-minded, bleb defect is more.At this point, 100 two sides of sand mold is respectively the first face and the second face, in the first face of sand mold 100 It is upper first to assemble sand core 300, circular ring shape fuse 8 is then assembled, a sand mold 100 is finally separately taken, the second face of sand mold 100 is fastened on Before on the first face of sand mold 100；So increase multiple arenaceous shells 100, forms superposition, formed between two adjacent sand molds 100 It is poured chamber, casting can form chain sprocket structure.

Meanwhile in comparative example, sand core sand mold arenaceous shell is thick, exists and penetrates the not firm defect of sand, be difficult to solve, later period needs are repaired It mends, compares and take a lot of work, yield rate is lower.

Using comparative example, sand ratio is 3.7, sand using amount 10.2Kg.

By comparison it is found that using in the utility model sand mold and sand mold prepare sprocket wheel, arenaceous shell thickness reduces, sand Than reducing, efficiency is improved.

Sand core in the prior art is directly installed on sand mold ontology 1 compared with prior art by the sand mold in the present embodiment On, and then when assembling, without repeatedly lower core, and in the present embodiment, arenaceous shell thickness becomes smaller, and core precoated sand is easy to heat, and uses sand Amount reduces, and arenaceous shell intensity becomes strong, and gas forming amount becomes smaller, and bleb defect tails off, and improves the yield rate of cast product.

Tool of the series of detailed descriptions listed above only for the feasible embodiment of the utility model Body explanation, they are all without departing from made by the utility model skill spirit not to limit the protection scope of the utility model Equivalent implementations or change should be included within the scope of protection of this utility model.

It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in All changes in justice and range are embraced therein.It should not treat any reference in the claims as limiting Related claim.

In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiments being understood that.

Claims (10)

1. a kind of sand mold is produced for handwheel characterized by comprising

The sand mold ontology (1) of circular ring shape, sand mold ontology (1) side of the circular ring shape is equipped with cylindrical sprue (2), described Sprue (2) is communicated with the pouring cup of storage potting syrup, the transmission for potting syrup；

Circular ring shape protrusion (3), the circular ring shape raised (3) are shaped in the upper surface of the sand mold ontology (1), the annulus Shape protrusion (3) is used to form the sand core of handwheel, and the interior circular diameter of the circular ring shape raised (3) is greater than the inner circle of sand mold ontology (1) The outside diameter of diameter, the circular ring shape raised (3) is less than the outside diameter of sand mold ontology (1)；

The edge of the circular ring shape sand mold ontology (1) extends to form enclosing, the outer circle of the enclosing and the circular ring shape raised (3) Between, casting circle (4) is formed, the sprue (2) is enclosed (4) with the casting and communicated；

On the circular ring shape raised (3), equipped with several the first gates (5), the both ends of first gate (5) respectively with The inner circle and outer circle of circular ring shape protrusion (3) connect；

It assists sand mold (6), the lower surface of auxiliary sand mold (6) is equipped with pours with raised (3) upper surface matched second of circular ring shape Infuse road (7), the side of auxiliary sand mold (6) is equipped with the auxiliary pouring channel that is connected with sprue (2), and the sand mold ontology (1) with it is auxiliary Help between sand mold (6) that there are circular ring shape fuse (8).

2. a kind of sand mold according to claim 1, which is characterized in that the lower surface of the sand mold ontology (1) is towards sand mold The upper surface of ontology (1) is recessed, and is formed recessed portion (9).

3. a kind of sand mold according to claim 2, which is characterized in that the recessed portion (9) be several, several recess It is separated between portion (9) by the first reinforcing rib (10).

4. a kind of sand mold according to claim 3, which is characterized in that sand mold lower surface middle position forms connection ring (11), the connection ring (11) connect with the first reinforcing rib (10).

5. a kind of sand mold according to claim 4, which is characterized in that the lower surface of the sand mold ontology (1) is equipped with a circle Protrude from the boss (12) of sand mold ontology (1), the width of the boss (12) is the half of the connection ring (11) to three /.

6. a kind of sand mold according to claim 5, which is characterized in that recessed portion (9) periphery is circular ring structure, described Circular ring structure is equipped with circle fixed ring (14).

7. a kind of sand mold according to claim 6, which is characterized in that be equipped with several second in each recessed portion (9) Reinforcing rib (15), the both ends of second reinforcing rib (15) inner circle and outer circle with the sand mold ontology (1) of the circular ring shape respectively Connection.

8. a kind of sand mold described in one of -7 according to claim 1, which is characterized in that the height of the circular ring shape raised (3) is 55mm-72mm。

9. according to a kind of sand mold described in one of claim 1-7, which is characterized in that further include fuse anchor point (16), with described The center of circle of sand mold ontology (1) is center symmetric points, the fuse anchor point (16) and the sprue (2) center symmetric setting in The two sides of the sand mold ontology (1).

10. according to a kind of sand mold described in one of claim 1-7, which is characterized in that the upper surface of the sprue (2) is equipped with fixed Position boss (17).