CN209255762U - A kind of sprocket wheel sand mold - Google Patents

Abstract

The utility model discloses a kind of sprocket wheel sand molds, it include: upper casing, the middle position of the upper casing is equipped with the first interstitial hole, the upper casing is equipped with annular protrusion, casting circle is formed between the annular protrusion and the upper casing edge, the annular protrusion is equipped with the first gate, and the upper shell-side is equipped with the first sprue being connected to the casting circle；Lower casing, the lower casing middle position is equipped with the second interstitial hole, the upper and lower surface of second interstitial hole is respectively equipped with the first casting chamber and the second casting chamber, the lower shell-side are equipped with the second sprue communicated with the second interstitial hole with the first sprue corresponding position；The second casting chamber end-enclosed, the lower casing are equipped with the second gate；Sand core, the sand core are sheathed on the annular protrusion；The inner wall of the sand core is equipped with tooth cavity.

Description

A kind of sprocket wheel sand mold

Technical field

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

Background technique

Metal casting cast molding generally uses precoated sand sand mold conduct molding sand mold, and wherein sand mold is generally divided into upper and lower two Shell.The design of shell is needed in view of the matching relationship between shell, the mobility status of molten metal, the i.e. design of running channel when casting Reasonability.

WG sprocket wheel conventional method is precoated sand stack-type, lower two fuses, one, outer garden tooth, intermediate sand core one, sand using amount Larger, sand ratio is 2.8-3.1 or so, and the stack-type technique that traditional handicraft uses needs the shell as two, the two sides of shell is set There is apperance, sand mold thickness is thicker in the case of this, and production use cost is high, and yield rate is low, and the Forming Quality of sand mold is related to subsequent The molding quality of casting.

Sprocket wheel, a kind of wheel with cog type whelp, mutually to be nibbled with the accurate block of pitch on pitch chain ring or cable It closes.Sprocket wheel is widely used in the machine driving etc. of the industries such as chemical industry, textile machine, food processing, instrument, petroleum.

Sprocket wheel is because its is complex-shaped, and general machining is difficult to manufacture, and machining cost is higher, sprocket wheel manufacture The sand casting in metal casting molding is mostly used, Modeling Material used in sand casting is cheap and easy to get, and Casting mold manufacturing is easy, right The single-piece production of casting is produced by batch and is adapted to mass production, is always the basic work in Foundry Production for a long time Skill.

Precoated sand casting technique is one kind of the resin sand in sand casting, the casting manufactured using precoated sand casting technique Small with surface roughness, dimensional accuracy is high, the good feature of quality, and collapsibility is good.

The sand casting of casting generally has stack-type technique and shell mold technical operation, and stack-type technique passes through multiple identical sand mold stackings Together, performance is cast multiple casting, and sand mold two sides has molding cavity in stack-type technique；Shell mold technical operation is generally primary It casts a casting, is divided into two sand molds up and down, only there is single sand mold a forming cavity or multilayer sand mold to form one group of sand mold； The technical issues of stack-type technique and shell mold technical operation all refer to sand mold mould assembly.

Sand mold mould assembly refers to that mo(u)ld top half and mo(u)ld bottom half carry out mould assembly, after mo(u)ld top half and mo(u)ld bottom half mould assembly between existing gap casting After will form burr, also will affect product size when serious, casting caused to be scrapped, so how to close sand mold preferably Type is the key that determine one ring of casting quality.

The quality of casting depends on the Forming Quality of precoated sand sand mold simultaneously, and in traditional technology, sprocket wheel generally uses stack-type Technique production, a sand mold two sides have molding cavity, and every two sand mold forms the forming cavity of a casting, and sand mold is real as a result, The heart, thicker, sand using amount is big, at high cost with sand, and it is saturating that core precoated sand is not easy heat hardening, influences sand mold intensity, uncured to cover Film sand gas forming amount is big, and bleb defect is more, causes sprocket wheel casting overall acceptability rate low；And use the thickness of shell mold technical operation sand mold Relatively thin, sand mold production quality is preferable, but the sprocket wheel casting that can only once cast, and production efficiency is low, high labor cost.

Traditional technology does not have the sand mould structure for having both two kinds of techniques at present, and carries out repeatedly same sand using identical sand mold The superposition of type causes each sand mold thicker, when casting, sand than big, meanwhile, formation and gear for sand mold middle position It is formed, needs repeatedly to descend fuse, sand mould structure is complicated, and production process is cumbersome.

Summary of the invention

In view of the above technical problems, the purpose of this utility model is to provide a kind of sprocket wheel sand molds, by simply tying Structure improves, and the advantage for realizing stack-type and shell mould casting combines, and improves production efficiency.

In order to realize the above technical effect, the utility model is achieved using following technical scheme:

A kind of sprocket wheel sand mold, comprising:

Upper casing, the middle position of the upper casing are equipped with the first interstitial hole, and the lower surface of the upper casing is equipped with annular protrusion, institute It states and forms casting circle between annular protrusion and the upper casing edge, the annular protrusion is equipped with several and casting circle and connects The first gate, the upper shell-side be equipped with first sprue that is connected to of casting circle,

Lower casing, the lower casing middle position are equipped with the second interstitial hole, and the upper and lower surface of second interstitial hole is respectively equipped with First casting chamber and the second casting chamber, the lower shell-side and the first sprue corresponding position are equipped with and the second interstitial hole The second sprue communicated；

The second casting chamber end-enclosed, the upper surface of the lower casing are equipped with several corresponding with the first gate second Gate, the first casting chamber are inserted into first interstitial hole；

Sand core, the sand core are sheathed on the annular protrusion, and when casting, the upper casing, sand core and lower casing are superimposed shape At the sand mold with casting chamber；

The inner wall of the sand core is equipped with several tooth cavities.

Further, described first chamber is poured as the gradually smaller rotary table cavity of diameter, in the rotary table cavity, diameter is most Big one side is close to the second interstitial hole.Since the hole a part in casting middle position is circular platform type structure, therefore need to pour first Note chamber is set as matching rotary table cavity, convenient for casting.

Further, the sand core periphery is equipped with positioning protrusion, and the upper casing lower surface is equipped with several positioning grooves, institute Positioning protrusion is stated to match with the positioning groove.Since sand core is sheathed on the lower surface of upper casing in order to enable circle sand core and upper casing It is fitted close, is convenient for lower fuse, therefore positioning groove is set,

Further, lower casing upper surface periphery and the positioning protrusion corresponding position are equipped with fuse locating slot, institute The one end for stating positioning protrusion is inserted into the fuse locating slot；Similarly, fuse locating slot is increased, convenient for positioning protrusion under The cooperation of shell, so that entire sand mold stationarity is good, convenient lower fuse.

Further, the upper surface of first interstitial hole is equipped with annular protrusion, the first female thread is formed, among described second Hole is equipped with a circle groove along the periphery of rotary table cavity, and the groove forms the first sub-buckle, first female thread and first son Button matching.In casting, each sand mold connection be must assure that closely, and the increase of snap fastener, when improving centre with sand core, on The sealed connection of lower casing；First interstitial hole has a certain thickness, and the thickness of annular protrusion, less than the thickness of the first interstitial hole, just In processing.

Further, first sprue upper surface is equipped with the second female thread outstanding, the second sprue following table Face is equipped with the second sub-buckle of recess, and second female thread is matched with second sub-buckle, and when upper casing is connect with lower casing, described Second female thread is inserted into second sub-buckle.The increase of second letter buckle, it is ensured that tight between the sprue of potting syrup circulation Close connection avoids the outflow of molten iron.

It further, further include reinforcing rib, the reinforcing rib is set to the outer surface of upper casing and/or lower casing, is used to support The upper casing and/or lower casing.By reinforcing rib, when pouring, can increase can intensity between, when multiple shells are superimposed When, reinforcing rib can ensure the intensity of all sand molds, and sand mold is avoided to damage.

The utility model compared with prior art, has the beneficial effect that:

In the utility model, since sand core is directly sleeved on upper casing, and upper casing, lower casing and sand core formed one group it is new Sand mold, compared to existing stack-type sand mold, sand mold is thinning, avoids and penetrates the not firm problem of sand.

In the utility model, compared with the sand mold of the prior art, when installation, lacks a fuse, has reduced a procedure, It improves work efficiency.

In the utility model, shell and core mold are changed to horizontal parting by vertical-parting, and sand mold thickness reduces, sand using amount Reduce, sand solidified soaking time reduces.

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 intermediate sand core in the prior art；

Fig. 4 is the sand mold assembling figure in sand core preparation in the prior art；

Fig. 5 is a kind of structural schematic diagram of sprocket wheel sand mold provided by the utility model；

Fig. 6 is one of the structural schematic diagram of upper casing provided by the utility model；

Fig. 7 is the second structural representation of upper casing provided by the utility model；

Fig. 8 is one of the structural schematic diagram of lower casing provided by the utility model；

Fig. 9 is the second structural representation of lower casing provided by the utility model；

Figure 10 is the structural schematic diagram of sand core provided by the utility model；

Figure 11 is the structural schematic diagram of sliding block provided by the utility model；

Figure 12 is the usage state diagram of sliding block provided by the utility model；

In figure: 1, upper casing；101, the first sprue；102, the first interstitial hole；103, the first gate；104, convex annular It rises；105, casting circle；106, positioning groove；2, lower casing；201, the second sprue；202, the second interstitial hole；203, the second casting Road；204, the first casting chamber；205, the second casting chamber；206, fuse locating slot；3, sand core；301, positioning protrusion；4, tooth cavity；5, First female thread；6, the first sub-buckle；7, the second female thread；8, the second sub-buckle；9, reinforcing rib；

100, sand mold；200, Cylinder Gear；300, intermediate sand core；400, sliding block；401, double wedge；402, spring.

Specific embodiment

Reach the technical means and efficacy that predetermined purpose is taken for the utility model is further described, below in conjunction with attached drawing And embodiment, to specific embodiment of the present utility model, structure feature and its effect, detailed description are as follows.

Embodiment 1

Referring to shown in attached drawing 5-10, one of the utility model sprocket wheel sand mold, including upper casing 1, lower casing 2 and sand core 3, Referring to shown in attached drawing 6-7, wherein upper casing 1 is circle, is equipped with the first sprue 101 for casting in the side of upper casing 1；Upper casing 1 middle position is equipped with the first interstitial hole 102, and is equipped with annular protrusion 104, annular protrusion 104 and upper casing in the lower surface of upper casing 1 A circle casting circle 105 is formed between 1 outer edge, and several first gates 103, the first casting are set on annular protrusion 104 Road 103 and casting circle are 105 identical, and are poured circle 105 and communicate with the first sprue 101 of upper shell-side, and then potting syrup can be with Enter in the first gate 103 on casting circle 105 and annular protrusion 104 by the first sprue 101；Referring to attached drawing 8-9 Shown, 2 middle position of lower casing in the present embodiment is correspondingly provided with the second interstitial hole 202, in the two sides up and down of the second interstitial hole point Not She You first casting chamber 204 and second casting chamber 205, when casting when, first casting chamber 204 with second be poured chamber 205 and First interstitial hole 102 cooperatively forms the intermediate structure of casting.And the second sprue 201 and the first sprue 101 of 2 side of lower casing Matching, for the circulation of potting syrup, when potting syrup flows into the second sprue 201, lower casing is additionally provided with several second on 2 upper surface Gate 203 forms casting chamber with the first gate 103, and potting syrup, which enters, to be poured, and the first casting chamber 204 is upper After lower casing cooperation, it can be inserted into the first interstitial hole 102, potting syrup enters in the first casting chamber 204 and the second casting chamber 205, Casting forms the structure among casting.In the present embodiment, referring to shown in attached drawing 5, on the annular protrusion 104 of 1 lower surface of upper casing It is also arranged with sand core 3, the inner wall of sand core 3 is equipped with tooth cavity 4, and potting syrup enters tooth through the first gate 103 on annular protrusion 104 In chamber 4, and then form the double wedge on cast product sprocket wheel.For the ease of casting, one of chamber 205 far from lower casing 2 is poured by second End seal is closed, and potting syrup is avoided to flow into other cavitys.

Referring to attached drawing 5, in the present embodiment, when casting, sand core 3 is set in the lower surface of upper casing 1, and upper casing 1 is arranged upper Portion, lower casing 2 are arranged in the lower part of upper casing 1, and sand core 3 is between upper casing 1 and lower casing 2, and the outer diameter of sand core 3 and upper casing 1 and The outer diameter of lower casing 2 matches, therefore forms the consistent shell mould sand mold in periphery；I.e. shell mould sand mold is successively upper casing 1, sand core 3 from top to bottom And lower casing 2.In attached drawing 5, for the ease of seeing annular protrusion 104, therefore lower casing 2 is placed on front.

In the present embodiment, 4 quantity of tooth cavity of 3 inner wall of sand core is 12-36, and the double wedge of existing chain sprocket structure is generally 12- 36.

In actual production, each product of sprocket wheel casting advise double wedge quantity are as follows: 1 " 12 teeth, 1.5 " 15 teeth, 2 " 20 teeth, 2.5 " 20 Tooth, 3 " 26 teeth.Wherein, what is 1 " indicated is an English inch, is that a kind of common English unit indicates and Writing method, i.e., when sprocket wheel is cast When the double wedge of part is an inch, it is equipped with 12 double wedges.

In the present embodiment, using circular shell, convenient for forming whole circular chain-wheel.

Referring to shown in attached drawing 1-4, in the prior art, 3 parts of valve body drive sprocket sand mold point, firstly, shell sand mold one is paid, 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, in the prior art, when sand core 3 forms, outer ring tooth core mold one is secondary, from cylinder Tooth by-level parting, several Cylinder Gears 200 are made into loose piece, fix by high temperature resistant magnet absorption on mold, every time before molding Operative employee is put loose piece with hand one by one, and then sand is penetrated in molding, keeps the temperature 4min, core sand mould is taken out in die sinking, then from core Cylinder Gear 200 is removed on son, at this time mold and about 200 DEG C of fuse temperature, tooth loose piece is installed and removes loose piece from fuse is easy Scald, it is dangerous, and very slow, shell (i.e. sand core 3) low efficiency processed is operated, one class about 30, shell processed.Again, intermediate core mold One is secondary, and core sand mould is thicker, penetrates not firm defect, is difficult to solve, and needs to repair, compares and take a lot of work, it is lower to influence yield rate.It is existing When preparing sand core 3 in technology, the front and back sides of the sand mold used are all formed product areas, and then the dynamic model of sand mold and sand mold cover half Combination, forms entire sand mold, forms a sand mold convenient for casting.And the molding for fuse, firstly, Cylinder Gear 200(, that is, outer circle Tooth) it is manually installed on cover half, then fixed half and moving half assembles, and forms an intermediate sand core and outer circle tooth core (i.e. Outer circle tooth core with tooth cavity that outer knuckle-tooth loose piece is formed).

The sand mold of the prior art, when preparing sprocket wheel, the two sides of sand mold 100 same first can form product, Jin Er Sand core 300 among first face over-assemble of sand mold 100, then assembles outer circle tooth core (sand core 3 i.e. in the application), then Take out another sand mold 100, the of the second face of sand mold 100 and the sand mold 100 before with intermediate sand core 300 and sand core 3 It fastens on one side, is poured the middle position of two sand molds 100, 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 sand mold forms, and is supported between upper layer and lower layer sand mold with reinforcing rib, subtracts sand with type, and sand mold thickness is thinned, and sand is used in reduction Amount reduces sand solidified soaking time in sand mold preparation, reduces cost, improves shell efficiency processed, while being able to achieve interstitial hole core Son is directly taken out of on sand mold.Secondly, sand mold in structure, compared with prior art, removes intermediate sand core, it is only necessary to sand core 3, And then few next fuse when installing additional, it reduces by a procedure, reduces sand using amount, reduce cost, improve efficiency.Secondly, outer circle The preparation of core sand mould is changed to Cylinder Gear auto-telescopic mechanism, is reduced by one of work by original manual placement Cylinder Gear loose piece Sequence prevents operative employee's scald when placing loose piece on die material, improves coremaking efficiency and safe operation.I.e. in the present embodiment In the preparation of sand core 3, it is made into automanual outer circle tooth core by 20 Cylinder Gears, i.e., is laid in the upper mold of fuse and has cylinder The sliding block of tooth core, by applying external force, when mold clamping, under the driving of lower die cone, automanual outer knuckle-tooth is towards mould Have peripheric movement, form sand core 3, when die sinking, after external force is eliminated, automanual outer knuckle-tooth leaves sand core, moves to mold center. Specifically, spring is set on knuckle-tooth outside mold, when mold clamping, spring stress is compressed, when mold is opened, spring stress portion Divide and need to restore, so that automanual outer knuckle-tooth leaves sand mold.In the entire production of sand core 3, without artificially placing or taking Cylinder Gear out avoids high-temperature operation.Again, shell and core mold are changed to horizontal parting by vertical-parting, have prevented sand mold Not firm defect is penetrated, the yield rate of sand mold and blank is improved.Specifically, horizontal parting refers to that mold opens and closes up and down, divides upper mold And lower die, vertical-parting refer to mold opening and closing left and right, point left mould and right mould, opposite core shooter be also classified into vertical core shooter and Horizontal core shooter.Finally, outer circle tooth core was demoulded in lower die top shell before this in test process prepared by sand core 3, lead to automatic machine Structure is easy to make automechanism clamping stagnation into sand and be not available, after upper and lower mould is exchanged, upper mold is not easy into sand, solves automatic Mechanism clamping stagnation defect.

Embodiment 2

As the further improvement of above-described embodiment, in the present embodiment, referring to shown in attached drawing 6-9, in order to cooperate in casting Between position frustum cone structure, by first casting chamber 204 be set as the gradually smaller rotary table cavity of diameter, in rotary table cavity, directly The maximum one side of diameter is close to the second interstitial hole 202.And then when being poured, it is capable of forming the casting intermediate of circular platform type.

In the present embodiment, in order to guarantee the stability connected between sand core 3 and upper casing 1 and lower casing 2, in the present embodiment, The periphery of sand core 3 is provided with positioning protrusion 301, specifically, at the outer circle of sand core 3, circular positioning protrusion can be increased 301, circular configuration part outwardly, i.e., in the outer circle of sand core 3, equipped with several circular configurations, circular configuration a part and sand Core 3 connects, and a part is in sand core 3, and a part is outside sand core 3, and certainly, the structure of positioning protrusion 301 can also select rib The structures such as shape, tetragonal body.

In order to hold positioning protrusion 301, in the lower surface of upper casing 1 and the upper surface of lower casing 2, it is recessed that positioning is respectively set Slot 106 and fuse locating slot 206, positioning protrusion 301 are higher than sand core 3, and positioning groove 106 and fuse are inserted into both ends respectively In locating slot 206, the fuse positioning of sand core 3 is realized.

As a further improvement, in the present embodiment, in order to closely connect intermediate hole site, therefore the first interstitial hole 102 to Under extend to form the first female thread 5, the first female thread 5 is annular protrusion, and outside diameter is straight less than the maximum of the first interstitial hole 102 Then diameter is poured the periphery of chamber 204 in the second interstitial hole 202 along rotary table cavity i.e. first, form a circle groove, and groove is to hold Receive the first sub-buckle 6 of the first female thread 5.When upper casing 1 and lower casing 2 fasten, the first female thread 5 is caught in the first sub-buckle 6.

It is possible to further set the first female thread 5 to the bulge-structure of step, the step bulge-structure includes Several steps, the step surface of the step successively become smaller from top to bottom, in the maximum step of step surface and described first Between hole 102 connect.

It can be two steps in the present embodiment, it is the same that two steps are set referring to shown in attached drawing 3, and then on lower casing 2 Groove, for accommodating the first step-like female thread 5.

In the present embodiment, for enlarged contact face, step is the gradually smaller frustum cone structure of diameter, the frustum cone structure In, diameter maximum one is facing towards first interstitial hole 102.In the present embodiment, when upper casing 1 and the fastening of lower casing 2, due to tool Standby two step-like snap fasteners, and then intermediate hole site is completely embedded when casting, form the structure of sprocket wheel middle circle hole site Place, molten iron are not easy to overflow, and then the high yield rate that the middle position of casting is formed.

Further, referring to shown in attached drawing 6-9, when due to casting, potting syrup flows down through sprue is past, therefore straight in order to improve Leakproofness at running channel is also equipped with the second female thread 7 outstanding in 101 lower surface of the first sprue in the present embodiment, and described second 201 upper surface of sprue is equipped with the second sub-buckle 8 of recess, and second female thread 7 is matched with second sub-buckle 8, and works as upper casing 1 When connecting with lower casing 2, second female thread 7 is inserted into second sub-buckle 8.

Further, in order to improve leakproofness, molten iron is avoided to flow out from sprue, the second female thread 7 is rotary table protrusion, rotary table Protrusion is laid in the periphery of the first sprue 101, and the maximum circle of diameter connects with the first sprue 101 in rotary table protrusion.Due to Sprue is pipeline configuration, and connective stability is poor, and frustum cone structure, close when so that the second sub-buckle 8 and the second female thread 7 being clamped Matching is cut, molten iron is not easy to flow out from junction, is directly entered casting type chamber, and casting forms casting.

In the present embodiment, in the second female thread 7, the thickness of frustum cone structure is up to the half of sprue thickness, height For 5mm-8mm.Since sprue is pipeline, thickness itself will not be too thick, if the thickness of frustum cone structure is too thin, sprue connects Place is met, is easily broken off, if too thick, the gradient of frustum cone structure is difficult to ensure, therefore maximum gauge is no more than sprue thickness Half.

It further include reinforcing rib 9 in the present embodiment, it, can be under the upper surface of upper casing 1 and lower casing 2 in the present embodiment Reinforcing rib 9 outstanding is arranged in surface, it is ensured that the stability in casting；Or the following table of the upper surface and lower casing 2 due to upper casing 1 Face is equipped with groove body, increases the reinforcing rib 9 for separating groove body between groove body, improves the intensity of shell.

Using the sprocket wheel sand mold in the present embodiment or embodiment 1, sprocket wheel is manufactured, comprising the following steps:

Firstly, sand mold assembles: upper casing 1, lower casing 2 and sand core 3 being assembled, firstly, sand core 3 is installed on upper casing 1 Annular protrusion 104 on, then lower casing 2 is installed on to the downside of upper casing 1, one has the upper casing 1 and a lower casing of sand core 3 2 form one group of sand mold；

When several groups sand mold assembles, 301 both ends of positioning protrusion on sand core 3 respectively with the positioning groove 106 on upper casing 1 with And the fuse locating slot 206 on lower casing 2 is installed, and pass through the first snap fastener between the upper surface of upper casing 1 and the lower surface of lower casing 2 Grafting passes through the second snap fastener grafting between the first sprue 101 and the second sprue 201.

When several groups sand mold assembles, necessarily can all there be lower casing 2 in the top and bottom of upper casing 1, at this point, the first interstitial hole of upper casing 1 First female thread 5 of 102 upper surfaces is caught in the first sub-buckle 6 of 2 second interstitial hole of lower casing, 202 lower surface of side disposed thereon；And The second female thread 7 on first sprue 101 can be also caught in the second sub-buckle 8, be realized between upper casing 1 and lower casing 2 on the upside of it Sealed connection.

When only one group of sand mold, by fastener etc., the leakproofness of sand mold assembling can be realized, and when multiple groups, then it needs Snap fastener is wanted to cooperate.

When several groups sand mold cooperates, reinforcing rib 9 can support adjacent upper casing 1 and lower casing 2, realize the support between sand mold Stablize.

In above-mentioned steps, when several groups sand mold stacks, auxiliary sand mold, institute can also be equipped on the upper casing 1 of top The surface structure of the lower surface and upper casing 1 of stating auxiliary sand mold matches；In the present embodiment, auxiliary sand mold can be lower casing 2, Purpose is to cover and fix the upper surface of upper casing 1.

Secondly, sand mold is fixed: distinguishing placing clamp in the two sides up and down of several groups sand mold, pass through screw rod phase between fixture Even, by tightening screw rod, several groups sand mold is fixed；

Again, sand mold is poured: potting syrup is poured out through the ladle spout on casting machine, into sprue cup, is filtered through ceramic filter Impurity in naked molten iron, the first sprue 101 and the second sprue 201, first flow into the gate of 1 upper surface of upper casing, continue Flow into that casting type that the first gate 103 and the second gate 203 are formed is intracavitary and the first interstitial hole 102 in, finally flow into In first casting chamber 204 of the second interstitial hole 202 and the second casting chamber 205；Until casting type chamber, completely whole beam casting, sand are poured Type casting terminates.

Finally, the formation of sprocket wheel product: after sand mold is poured, forming at least one sprocket wheel product, the sprocket wheel product Intermediate guide groove by the second interstitial hole 202 the first casting chamber 204 and the second casting chamber 205 formed, the sprocket wheel produces The outer ring of product is formed by casting circle 105, and the coupling part of the outer ring of the sprocket wheel product and intermediate guide groove is by the first gate 103 and second formation of gate 203, the gear of the sprocket wheel product formed by the tooth cavity 4 of sand core 3；

Finally, the taking-up of sprocket wheel product: after casting, the sand mold after fixing is dismantled, by upper casing 1, lower casing 2 and sand core 3 disassemblies, that is, can be taken off the sprocket wheel product.

Specifically, the taking-up of sprocket wheel product is, after casting, entire sand mould structure is after sandbox keeps the temperature 2 hours, disassembly The fixed sand mold and screw rod installed additional, casting beam is placed on viberating knock-out machie, the 3-6 minutes vibrating shakeout moon, casting exterior molding sand The defeated and dispersed separation that falls off of meeting, exposes casting, and upper casing, lower casing and sand core are dismantled, that is, can be taken off the casting of the sprocket wheel product Beam.

Precoated sand has good collapsibility, at high temperature will be defeated and dispersed after about 1 hour, does not have to dismantle upper lower casing, vibration After will fall off separation.

In the present embodiment, reinforcing rib 9 is generally located on the sand mold back side up and down, for reinforcing sand mold, improves sand mold intensity, prevents Only sand mold and casting deformation, and for the supporting role from when installing additional between upper and lower sand mold.

Embodiment 3

In the present embodiment, referring to shown in attached drawing 5-11, 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 the periphery of clamping ring is equipped with several double wedges, in Between be equipped with leading truck mounting groove, leading truck mounting groove connect with ring structure by connector, and leading truck mounting groove is including being located at Cavity cylindrical body and the boss cavity of centre.

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.

Shell 2 is put down in fixture, upward, i.e., the back side (is poured using the first of back side intermediate projections upward for the upper surface of lower casing 2 Note chamber 204 and the second casting chamber 205 of lower part form interior round straight hole and leading truck mounting groove, i.e., are entirely oriented to mounting groove), and The outer surface of lower casing 2 is polished and the fitting of fixture upper steel plate is tight, is consolidated.

2, sand mold assembles: taking a upper casing 1, blocks up tight sprue (i.e. stifled bottom) with dedicated precoated sand insert, prevent from metalling run out. The upper casing 1 at bottom will be blocked up, overlayed on the lower casing 2 being placed on fixture, the snap fastener between lower casing is made to coincide.

It further include that sand core 3, and 301 both ends of positioning protrusion of sand core 3 point are installed in the lower surface of upper casing 1 in sand mold assembling It is not bumped into the positioning groove 106 of upper casing 1 and the fuse locating slot 206 of lower casing 2.

Wherein, a upper casing 1 and a lower casing 2 with sand core 3 form one group of sand mold, and every group of sand mold forms a chain Casting is taken turns, several groups sand mold can be set according to demand.At this point, sand mold assembling steps are repeated, until the quota height that is added to, Then one group of sand mold under placed on top forms interstitial hole and shape using the conical boss among lower sand mold.

When the assembling of several groups sand mold, between adjacent sand mold, between the upper surface of upper casing 1 and the lower surface of lower casing 2, It is realized and is clamped by the first snap fastener；And between two sprues, then it is clamped by the second letter buckle.

Several groups sand mold stacks, on the upper casing 1 of top can be equipped with auxiliary sand mold, it is described auxiliary sand mold lower surface with Annular protrusion on the upper casing of top matches；Certainly, auxiliary sand mold can be lower casing 2.

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 gate of 1 upper surface of upper casing through the first sprue 101 and the second sprue 201, after Afterflow enter that casting type that the first gate 103 and the second gate 203 are formed is intracavitary and the first interstitial hole 102 in, finally flow Enter in the first casting chamber 204 and the second casting chamber 205 of the second interstitial hole 202；

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 the second interstitial hole 202 first casting chamber 204 and second casting chamber 205 formed, the sprocket wheel product Outer ring 105 is formed by casting circle, the coupling part of the outer ring of the sprocket wheel product and centre guide groove by the first gate 103 with And second formation of gate 203, the gear of the sprocket wheel product formed by the tooth cavity 4 of sand core 3；

6, the taking-up of sprocket wheel product: after casting, the sand mold after fixing is dismantled, upper casing 1, lower casing 2 and sand core 3 are torn open It unloads, that is, can be taken off the sprocket wheel product.Specifically, after casting, entire sand mould structure is protected in sandbox for the taking-up of sprocket wheel product Temperature dismantles the fixed sand mold and screw rod installed additional, casting beam is placed on viberating knock-out machie after 2 hours, and vibrating shakeout moon 3-6 points Clock, casting exterior molding sand defeated and dispersed can fall off separation, expose casting, and upper casing, lower casing and sand core are dismantled, that is, can be taken off described The casting beam of sprocket wheel product.

Further include the preparation of sand core 3 in the present embodiment, specifically, by sliding block 400 shown in Figure 11, is pacified and turned It prepares in the fuse upper mold of sand core 3, since the side of sliding block 400 is equipped with double wedge 401 and spring 402, referring to attached drawing 11-12 institute Show, therefore when mold clamping, 402 stress of spring is compressed, and when mold is opened, 402 part of the force of spring needs to restore, so that Automanual outer knuckle-tooth is far from sand core.In the entire production of sand core 3, without artificially placing or taking out Cylinder Gear, high temperature is avoided Operation.

It is less next intermediate sand core 300 among new sand mold now, is to form inner hole, upper and lower sand by 1 back side boss of upper casing Type, which cooperates to assemble, forms intermediate inner hole, leading truck mounting groove and intermediate shape, has an annular oily in leading truck mounting groove Slot is down pattern draft, cannot directly take sand mold out of, and sand mold originally is that a fuse has been done exclusively for interstitial hole, is used to shape At interstitial hole and leading truck mounting groove, the inspiration for the three-cavity moulding that hand moulding is used once in a while was expected later, exactly made three casees Type is completed using the advantage of shell mould with two casees, and lower interstitial hole fuse is not had to, and is reduced sand using amount, is reduced by a core sand mould with together with Process.

In the present embodiment, sand ratio is 1.426, sand using amount 4.28Kg；Sand mold thickness reduces, without installing loose piece of taking (i.e. double wedge 400), safe operation, work efficiency is high.

Comparative example

Referring to shown in attached drawing 1-4, above-mentioned WG sprocket wheel is manufactured simultaneously using the prior art, firstly, it is necessary to 100 sand mold one of sand mold Pay, 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, compared with Thickness, 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 overlay film Sand gas forming amount is big, and bleb defect is more.At this point, 100 two sides of sand mold is respectively the first face and the second face, the of sand mold 100 Intermediate sand core 300 is first assembled on one side, sand core 3 is then assembled, finally separately takes a sand mold 100, and the second surface buckle of sand mold 100 is closed On the first face of sand mold 100 before；So increase multiple sand molds 100, forms superposition, shape between two adjacent sand molds 100 At casting chamber, casting can form chain sprocket structure.

In the present embodiment, when making sand core 3, need outer ring tooth core mold one secondary, from Cylinder Gear by-level parting, Several Cylinder Gears 200 are made into loose piece, and the absorption of high temperature resistant magnet is fixed on the mold, and operative employee is with hand by loose piece before molding every time It puts one by one, then sand is penetrated in molding, keeps the temperature 4min, and core sand mould is taken out in die sinking, and it is living that Cylinder Gear is then removed from fuse Block, mold and about 200 DEG C of fuse temperature at this time install tooth loose piece 200 and remove loose piece from fuse and are easy scald, dangerous, And very slow, shell low efficiency processed is operated, one class about 30, shell processed.Intermediate core mold one is secondary, and core sand mould is thicker, penetrates not firm Defect is difficult to solve, and needs to repair, compares and take a lot of work, it is lower to influence yield rate.

In comparative example, outer knuckle-tooth loose piece by being mounted on cover half by sand core 3 manually, specifically, resistance on mold High temperature magnet absorption regulation, operative employee needs to be put loose piece one by one with hand before molding every time, and then sand is penetrated in molding, keeps the temperature Core sand mould is taken out in 4min, die sinking, and the anti-dandruff Cylinder Gear loose piece from fuse, mold and fuse temperature are at 200 DEG C or so at this time, peace Toothing loose piece and loose piece is removed from fuse be easy scald, dangerous, operation is slow, shell low efficiency processed, and one class about 30, shell processed.So Fixed half and moving half assembles afterwards, formed an intermediate sand core and outer circle tooth core (i.e. outer knuckle-tooth loose piece formation with teeth Outer circle tooth core of chamber).Therefore, the sand mold of the prior art needs thicker sand mold when preparing sprocket wheel, and then sand mold assembles When, fuse twice under needing.

Meanwhile in comparative example, intermediate sand core sand mold 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, sand mold thickness reduces, sand Than reducing, in entire casting, double wedge 400 is moved by actuator towards upper lower casing, is not necessarily to high-temperature operation, and fuse is thinned, operation Safety, efficiency improve.

Intermediate sand core in the prior art is directly installed on upper casing 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, sand mold thickness becomes smaller, and core precoated sand is easy to heat, and uses sand Amount reduces, and sand mold intensity becomes strong, and gas forming amount becomes smaller, and bleb defect tails off, and improves the yield rate of cast product.

In the present embodiment, when making sand core 3, without human intervention, by the increase of slide block structure, realize semi-automatic It is flexible, improve the producing efficiency of sand core 3.

It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined Assert that the specific implementation of the utility model is only limited to these instructions.For the ordinary skill of the utility model technical field For personnel, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made, should all regard To belong to the protection scope of the utility model.

Claims (7)

1. a kind of sprocket wheel sand mold characterized by comprising

The middle position of upper casing (1), the upper casing (1) is equipped with the first interstitial hole (102), and the lower surface of the upper casing (1) is equipped with Annular protrusion (104) forms casting circle (105), the annular between the annular protrusion (104) and the upper casing (1) edge Raised (104) are equipped with several the first gates (103) connecting with the casting circle (105), and upper casing (1) side is equipped with The first sprue (101) being connected to the casting circle (105),

Lower casing (2), lower casing (2) middle position are equipped with the second interstitial hole (202), above and below second interstitial hole (202) Surface is respectively equipped with the first casting chamber (204) and the second casting chamber (205), and lower casing (2) side is directly poured with described first Road (101) corresponding position is equipped with the second sprue (201) communicated with the second interstitial hole (202)；

Described second casting chamber (205) end-enclosed, the upper surface of the lower casing (2) are equipped with several and the first gate (103) Corresponding second gate (203), second gate (203) communicate with second sprue (201), and described first pours Chamber (204) are infused to be inserted into first interstitial hole (102)；

Sand core (3), the sand core (3) are sheathed on the annular protrusion (104), when casting, the upper casing (1), sand core (3) with And lower casing (2) superposition forms the sand mold with casting chamber；

The inner wall of the sand core (3) is equipped with several tooth cavities (4).

2. a kind of sprocket wheel sand mold according to claim 1, which is characterized in that it is described first casting chamber (204) be diameter by The small rotary table cavity of gradual change, in the rotary table cavity, the maximum one side of diameter is close to the second interstitial hole (202).

3. a kind of sprocket wheel sand mold according to claim 1, which is characterized in that sand core (3) periphery is equipped with positioning protrusion (301), upper casing (1) lower surface is equipped with several positioning grooves (106), and the positioning protrusion (301) and the positioning are recessed Slot (106) matching.

4. a kind of sprocket wheel sand mold according to claim 3, which is characterized in that lower casing (2) the upper surface periphery with it is described Positioning protrusion (301) corresponding position is equipped with fuse locating slot (206), and the fuse is inserted into one end of the positioning protrusion (301) In locating slot (206).

5. a kind of sprocket wheel sand mold according to claim 2, which is characterized in that the upper surface of first interstitial hole (102) Equipped with annular protrusion, being formed the first female thread (5), second interstitial hole (202) is equipped with a circle groove along the periphery of rotary table cavity, The groove forms the first sub-buckle (6), and first female thread (5) matches with first sub-buckle (6).

6. a kind of sprocket wheel sand mold according to claim 1, which is characterized in that the first sprue (101) upper surface is set There is the second female thread (7) outstanding, the second sprue (201) lower surface is equipped with the second sub-buckle (8) of recess, and described second is female Button (7) is matched with second sub-buckle (8), and when upper casing (1) is connect with lower casing (2), described in the second female thread (7) insertion In second sub-buckle (8).

7. a kind of sprocket wheel sand mold according to claim 6, which is characterized in that further include reinforcing rib (9), the reinforcing rib (9) it is set to the outer surface of upper casing (1) and/or lower casing (2), is used to support the upper casing (1) and/or lower casing (2).