CN201353639Y

CN201353639Y - Low-pressure cast mould for heavy-duty truck gearbox

Info

Publication number: CN201353639Y
Application number: CNU2009201143647U
Authority: CN
Inventors: 陈保龙; 董晓丹; 陶美娟; 姚杰; 王承伟
Original assignee: NINGBO HELI MOULD TECHNOLOGY Co Ltd
Current assignee: NINGBO HELI MOULD TECHNOLOGY Co Ltd
Priority date: 2009-02-23
Filing date: 2009-02-23
Publication date: 2009-12-02
Anticipated expiration: 2019-02-23

Abstract

A low-pressure cast mould for a heavy-duty truck gearbox is used for casting heavy-duty truck gearboxes. The low-pressure cast mould comprises two separated parts, namely an upper mould and a lower mould, wherein, the upper mould comprises an upper mould block, an upper mould frame, a core-pulling mechanism, a locking positioning sleeve, and a cast ejection and reset mechanism; the upper mould block is provided with an upper mould cavity; the upper mould frame is connected with a machine tool; the number of the core-pulling mechanism is three; the cast ejection and reposition mechanism comprises an ejector rod, an ejector rod fixed plate, a pushing plate and a reset lever; the lower mould comprises a lower mould block, a lower mould frame and a locking positioning pin; a lower mould cavity, as well as a gate I (12) and a gate II (13) which are connected with the lower mould cavity are arranged on the lower mould block; and the lower die frame is connected with the machine tool. The cast mould can produce casting products meeting the requirements without requiring large investment, and has the advantages of high cast texture density, good cast quality and high production efficiency; and meanwhile, the utilization rate of metal fluid is high, and the consumption of ancillary material is low.

Description

The heavy duty trucks gear box low pressure casting die

Technical field

The utility model relates to the metal casting technical field, especially relates to a kind of low pressure casting die of heavy duty trucks gear box.

Background technology

Heavy duty trucks gear box, also claim bell housing, it is a key components and parts on the heavy duty truck engine, all to use these parts on the truck of various models, although all differences to some extent of the concrete structure shape of these parts on the various model trucies, but its citation form has very big uniformity, so these parts are very big families; This part build is very big, and its appearance and size length * wide * height is 950mm * 650mm * 200mm, planform complexity, specification requirement height: the construction profile size and the high-precision requirement that 1. need reach the designed complexity of client; 2. part is detected a flaw through X, and its uneven thick large part internal porosity, shrinkage cavity diameter are not more than 2mm, and quantity is not more than 5; 3. part is depressed at 0.8 crust gas and is done air seal test, should not leak; 4. satisfy the structural strength requirement, that is: tensile strength 〉=240MPa, percentage elongation 〉=1%.Therefore, this product casting difficulty is very big; The way that the gear-box foundry goods is traditional at home and abroad all is to adopt sand mold gravity foundry technology or extrusion process to produce; When adopting the sand mold gravity foundry technology to produce, have following shortcoming: 1. surface roughness are bigger; 2. foundry goods interior tissue crystal grain is thick, and the foundry goods mechanical performance is relatively poor; 3. because running and feeding system is complicated, and the aluminium water use efficiency is lower, also influenced the attractive in appearance of foundry goods appearance simultaneously; 4. the moulding sand consumption is big, and production environment is abominable; 5. production efficiency is low; And when adopting extrusion process to produce, have following shortcoming: 1. because casting section thickness is seriously uneven, very easily produce a large amount of pores and shrinkage cavity, have a strong impact on the product mechanical performance in thick large part; 2. because part is too big, need 5 kilotons above die casting machine and compression mod, investment is expensive.

Summary of the invention

The purpose of this utility model is in order to overcome the drawback of above-mentioned prior art, a kind of heavy duty trucks gear box low pressure casting die to be provided, not needing expensive investments, can produce satisfactory cast product, and THE STRUCTURE OF CASTINGS density height, casting quality is good, the production efficiency height; The utilization rate height of while molten metal, auxiliary material consumption is few.

For achieving the above object, the technical solution of the utility model is such: a kind of heavy duty trucks gear box low pressure casting die, form by two divided portion of upper die and lower die; Wherein patrix comprises upper module, top mold frame, core-pulling mechanism, mould assembly positioning sleeve and foundry goods ejects and resetting-mechanism; Said upper module and top mold frame fix, and offer model cavity in upper module, and top mold frame connects with lathe; Said core-pulling mechanism has three, is respectively: first core-pulling mechanism, form by the pull bar I of loosing core, loose core cylinder installing plate I, side rails I, slide block I, loose core I and guide pad I; The I of wherein loosing core forms first side of foundry goods and takes out face, and loose core I and slide block I link, and slide block I forms by chute and two side rails I and is slidingly matched; Said guide pad I and slide block I form by gathering sill and are slidingly matched, and the motion of slide block I is play the guiding role; The said pull bar I of loosing core connects with slide block I, and its effect is to transmit the power of loosing core, and pulling slide block I is together with the I of loosing core, and is under the guide effect of guide pad I, reciprocating along two side rails I; The said cylinder installing plate I of loosing core is fixed on two side rails I, and it works to connect two side rails I and the cylinder I of loosing core is installed; Said two side rails I and top mold frame fix, and make first core-pulling mechanism become an organic whole; Second core-pulling mechanism is made up of the pull bar II of loosing core, loose core cylinder installing plate II, side rails II, slide block II, loose core II and guide pad II; The II of wherein loosing core forms second side of foundry goods and takes out face, and loose core II and slide block II link, and slide block II forms by chute and two side rails II and is slidingly matched; Said guide pad II and slide block II form by gathering sill and are slidingly matched, and the motion of slide block II is play the guiding role; The said pull bar II of loosing core connects with slide block II, and its effect is to transmit the power of loosing core, and pulling slide block II is together with the II of loosing core, and is under the guide effect of guide pad II, reciprocating along two side rails II; The said cylinder installing plate II of loosing core is fixed on two side rails II, and it works to connect two side rails II and the cylinder II of loosing core is installed; Said two side rails II and top mold frame fix, and make second core-pulling mechanism become an organic whole; The 3rd core-pulling mechanism is made up of the pull bar III of loosing core, loose core cylinder installing plate III, side rails III, slide block III, loose core III and guide pad III; The III of wherein loosing core forms the 3rd side of foundry goods and takes out face, and loose core III and slide block III link, and slide block III forms by chute and two side rails III and is slidingly matched; Said guide pad III and slide block III form by gathering sill and are slidingly matched, and the motion of slide block III is play the guiding role; The said pull bar III of loosing core connects with slide block III, and its effect is to transmit the power of loosing core, and pulling slide block III is together with the III of loosing core, and is under the guide effect of guide pad III, reciprocating along two side rails III; The said cylinder installing plate III of loosing core is fixed on two side rails III, and it works to connect two side rails III and the cylinder III of loosing core is installed, and two side rails III and top mold frame fix, and make the 3rd core-pulling mechanism become an organic whole;

Said mould assembly location is with 4, is separately positioned on 4 angles of low pressure casting die; Said foundry goods ejects with resetting-mechanism to be made up of push rod, push rod fixed head, push pedal and release link; Wherein push rod is arranged on the position of the easy snap gauge of foundry goods, and it passes upper module and is installed on the push rod fixed head, and its effect is that foundry goods is ejected from die cavity; Push rod fixed head and upper module fix, and its effect is a fixed mandril; Push pedal and push rod fixed head link, and its effect is that push rod is pushed down, and the transmission foundry goods ejects thrust; Said release link has four, is separately positioned on 4 angles of upper module, and its upper end passes upper module and the push rod fixed head links, and the lower surface contacts with the counterdie die joint, and its effect is the position before push rod being returned to eject;

Said counterdie comprises lower module, following mould bases and mould assembly alignment pin; The cast gate I that in lower module, offers die cavity and connect, cast gate II with die cavity, cast gate I and cast gate II are the inlets that aluminum alloy melt enters die cavity; Following mould bases fixedly lower module incorporating mill bed links; The mould assembly alignment pin has 4, is assembled in down on the mould bases, cooperates connection with the mould assembly positioning sleeve of patrix respectively, accurately locatees when making the upper and lower mould mould assembly.

The course of work of the present utility model is such: under the effect of air injection machine die locking force, patrix moves downward, when the lower surface that moves to release link touches the counterdie die joint, because the drag effect of counterdie, make release link stop to move downward, meanwhile and the joining push pedal of release link, push rod fixed head and push rod also all stopped moving downward; Along with patrix continues to move downward, when the patrix die joint contacts also stop motion with the counterdie die joint, the position before push rod just has been returned to and has ejected; And then, under the promotion of three cylinders of loosing core, thrust is respectively by the pull bar I of loosing core, loose core the pull bar II and the pull bar III of loosing core, promoting slide block I, slide block II and slide block III respectively together with the I of loosing core, the loose core II and the III of loosing core, respectively along side rails I, side rails II and side rails III, and the guide direction of guide pad I, guide pad II and guide pad III, move to the die cavity center, loose core up to three and to insert die cavity fully, so far, the mould assembly action is finished.

During cast, molten metal is respectively by down gate I and cast gate II filling die cavity, after molten metal is full of die cavity, air injection machine in time provides supercharging, this supercharging is delivered in the die cavity at once by cast gate I and cast gate II, and keeps a period of time, and molten metal solidifies under certain pressure, make the thick large part of foundry goods obtain feeding easily, this has just guaranteed the densification of foundry goods interior tissue.

After casting solidification is finished, remove the aluminium hydraulic coupling, carry out the open form operation.During open form, the air injection machine band patrix and is moved upward, and the foundry goods in the die cavity is attached in the model cavity and moves upward together under the acting in conjunction of package power and three chucking powers of loosing core.After patrix and counterdie are thrown off fully, loose core under the traction of oil cylinder separately for three, tractive force is respectively by the pull bar I of loosing core, loose core the pull bar II and the pull bar III of loosing core, drawing slide block I, slide block II and slide block III respectively together with the I of loosing core, the loose core II and the III of loosing core, respectively along the guide direction of side rails I, side rails II and side rails III and guide pad I, guide pad II and guide pad III, to outer side shifting, loose core up to three and to throw off foundry goods fully away from die cavity.At this moment, patrix continues to move upward, under the promotion of lathe reaction force, the promotion push pedal moves downward, push rod fixed head, push rod and release link that drive is bound up in the push pedal move downward together, because the push rod other end heads on foundry goods, so in the process that push rod moves downward, foundry goods has been ejected last model cavity.So far, the open form action is finished.

A kind of heavy duty trucks gear box low pressure casting die of the present utility model, have the following advantages: 1. adopt the double teeming mouth, effectively shortened the liquid metal filling stroke, feeding condition when having improved casting solidification, foundry goods solidifies under certain pressure in addition, thereby significantly increased foundry goods dense structure degree, improved casting quality; 2. three core-pulling mechanisms are arranged on patrix, under the situation that upper and lower mould foundry goods package power is more or less the same, guaranteed the cast open form after, foundry goods is reserved in the patrix, has realized ejecting pickup well; 3. owing to be low-pressure casting process, foundry goods does not have rising head, and cast gate is very little, has therefore greatly improved the utilization rate of molten metal; 4. compare to traditional sand casting, its production efficiency height, auxiliary material consumption is few.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is a patrix structural representation of the present utility model.

Fig. 2 is the cutaway view behind the upper and lower mould matched moulds of the present utility model.

Fig. 3 is a counterdie structural representation of the present utility model.

Among the figure: 1, first core-pulling mechanism, 101, the pull bar I of loosing core, 102, the cylinder installing plate I of loosing core, 103, side rails I, 104, guide rail screw I, 105 slide block I, 106, the I of loosing core, 107, guide pad I, 2, second core-pulling mechanism, 201, the pull bar II of loosing core, 202, the cylinder installing plate II of loosing core, 203, side rails II, 204, guide rail screw II, 205, slide block II, 206, the II of loosing core, 207, guide pad II, 3, the 3rd core-pulling mechanism, 301, the pull bar III of loosing core, 302, the cylinder installing plate III of loosing core, 303, side rails III, 304, guide rail screw III, 305, slide block III, 306, the III of loosing core, 307, guide pad III, 4, the mould assembly positioning sleeve, 5, last model cavity, 6, top mold frame, 7, upper module, 8, foundry goods ejects and resetting-mechanism, and 801, push rod, 802, the push rod fixed head, 803, push pedal, 804, release link, 9, lower module, 10, following mould bases, 11, the counterdie die cavity, 12, cast gate I, 13, cast gate II, 14, the mould assembly alignment pin.

The specific embodiment

Shown in Fig. 1-3, a kind of heavy duty trucks gear box low pressure casting die of the present utility model is made up of two divided portion of upper die and lower die; Wherein patrix comprises that upper module 7, top mold frame 6, core-pulling mechanism, mould assembly positioning sleeve 4 and foundry goods eject and resetting-mechanism 8; Said upper module 7 and top mold frame 6 fix, and offer model cavity 5 in upper module, and top mold frame 6 connects with lathe; Said core-pulling mechanism has three, is respectively: first core-pulling mechanism 1, form by the pull bar I 101 of loosing core, loose core cylinder installing plate I 102, side rails I 103, slide block I 105, loose core I 106 and guide pad I 107; First side that the I 106 of wherein loosing core forms foundry goods is taken out face, and the I 106 of loosing core links with slide block I 105, and slide block I forms by chute and two side rails I 103 and is slidingly matched; Said guide pad I 107 forms by gathering sill with slide block I 105 and is slidingly matched, and the motion of slide block I is play the guiding role; The said pull bar I 101 of loosing core connects with slide block I 105, and its effect is to transmit the power of loosing core, and pulling slide block I is together with the I of loosing core, and is under the guide effect of guide pad I, reciprocating along two side rails I; The said cylinder installing plate I 102 of loosing core is fixed on two side rails I, and it works to connect two side rails I and the cylinder I of loosing core is installed; Said two side rails I 103 fix with top mold frame 6 by guide rail screw I 104, make first core-pulling mechanism become an organic whole; Second core-pulling mechanism 2 is positioned at the opposite of first core-pulling mechanism, is made up of the pull bar II201 of loosing core, loose core cylinder installing plate II202, side rails II203, guide rail screw II204, slide block II205, loose core II206 and guide pad II207; The II206 of wherein loosing core forms second side of foundry goods and takes out face, and loose core II206 and slide block II205 link, and slide block II forms by chute and two side rails II and is slidingly matched; Said guide pad II207 and slide block II205 form by gathering sill and are slidingly matched, and the motion of slide block II is play the guiding role; The said pull bar II201 of loosing core connects with slide block II 205, and its effect is to transmit the power of loosing core, and pulling slide block II is together with the II of loosing core, and is under the guide effect of guide pad II, reciprocating along two side rails II; The said cylinder installing plate II202 of loosing core is fixed on two side rails II, and it works to connect two side rails II and the cylinder II of loosing core is installed; Said two side rails II 203 fix with top mold frame 6 by guide rail screw II 204, make second core-pulling mechanism become an organic whole; The 3rd core-pulling mechanism 3, be positioned at the right side of second core-pulling mechanism, and with second core-pulling mechanism at angle, by the pull bar III301 of loosing core, loose core cylinder installing plate III302, side rails III303, guide rail screw III304, slide block III305, loose core III306 and guide pad III307 form; The III306 of wherein loosing core forms the 3rd side of foundry goods and takes out face, and loose core III and slide block III link, and slide block III forms by chute and two side rails III and is slidingly matched; Said guide pad III307 and slide block III305 form by gathering sill and are slidingly matched, and the motion of slide block III is play the guiding role; The said pull bar III301 of loosing core connects with slide block III305, and its effect is to transmit the power of loosing core, and pulling slide block III is together with the III of loosing core, and is under the guide effect of guide pad III, reciprocating along two side rails III; The said cylinder installing plate III302 of loosing core is fixed on two side rails III, it works to connect two side rails III and the cylinder III of loosing core is installed, two side rails III303 fix by guide rail screw III and top mold frame 6, make the 3rd core-pulling mechanism become an organic whole;

Said mould assembly positioning sleeve 4 has 4, is separately positioned on 4 angles of mould; Said foundry goods ejects with resetting-mechanism 8 to be made up of push rod 801, push rod fixed head 802, push pedal 803 and release link 804; Wherein push rod 801 is arranged on the position of the easy snap gauge of foundry goods, and it passes upper module 7 and is installed on the push rod fixed head 802, and its effect is that foundry goods is ejected from die cavity; Push rod fixed head 802 fixes with upper module 7, and its effect is a fixed mandril; Push pedal 803 links with push rod fixed head 802, and its effect is that push rod is pushed down, and the transmission foundry goods ejects thrust; Said release link 804 has four, is separately positioned on 4 angles of upper module, and its upper end passes upper module and the push rod fixed head links, and the lower surface contacts with the counterdie die joint, and its effect is the position before push rod being returned to eject;

Said counterdie comprises lower module 9, following mould bases 10 and mould assembly alignment pin 14; Offer counterdie die cavity 11 and the cast gate I 12 that connects with the counterdie die cavity, cast gate II13 in lower module 9, cast gate I and cast gate II are the inlets that aluminum alloy melt enters die cavity; Following mould bases 10 fixedly lower module 9 incorporating mill beds links; Mould assembly alignment pin 14 has 4, is assembled in down on the mould bases 10, cooperates connection with the mould assembly positioning sleeve 4 of patrix respectively, accurately locatees when making the upper and lower mould mould assembly.

Claims

1, a kind of heavy duty trucks gear box low pressure casting die is made up of two divided portion of upper die and lower die, it is characterized in that: patrix comprises upper module (7), top mold frame (6), core-pulling mechanism, mould assembly positioning sleeve (4) and foundry goods ejects and resetting-mechanism (8); Said upper module (7) and top mold frame (6) fix, and offer model cavity (5) in upper module, and top mold frame (6) connects with lathe; Said core-pulling mechanism has three, is respectively: first core-pulling mechanism (1), be positioned at second core-pulling mechanism (2) on the first core-pulling mechanism opposite, be positioned at the right side of second core-pulling mechanism, and with second core-pulling mechanism the 3rd core-pulling mechanism (3) at angle; Said mould assembly positioning sleeve (4) has 4, is separately positioned on 4 angles of mould; Said foundry goods ejects and resetting-mechanism (8) is made up of push rod (801), push rod fixed head (802), push pedal (803) and release link (804); Wherein push rod (801) is arranged on the position of the easy snap gauge of foundry goods, and it passes upper module (7) and is installed on the push rod fixed head (802), and push rod fixed head (802) fixes with upper module (7), and push pedal (803) links with push rod fixed head (802); Said release link (804) has four, is separately positioned on 4 angles of upper module (7), and its upper end passes upper module and the push rod fixed head links, and the lower surface contacts with the counterdie die joint; Said counterdie comprises lower module (9), following mould bases (10) and mould assembly alignment pin (14); The cast gate I (12) that in lower module (9), offers counterdie die cavity (11) and connect, cast gate II (13) with the counterdie die cavity; Following mould bases (10) fixedly lower module (9) incorporating mill bed links; Mould assembly alignment pin (14) has 4, is assembled on the counterdie (10), cooperates connection with the mould assembly positioning sleeve (4) of patrix respectively.

2, according to the said a kind of heavy duty trucks gear box low pressure casting die of claim 1, it is characterized in that: said first core-pulling mechanism (1) is made up of the pull bar I (101) of loosing core, the cylinder installing plate I (102) of loosing core, side rails I (103), slide block I (105), the I of loosing core (106) and guide pad I (107); The I (106) of wherein loosing core links with slide block I (105), and slide block I forms by chute and two side rails I (103) and is slidingly matched; Said guide pad I (107) forms by gathering sill with slide block I (105) and is slidingly matched; The said pull bar I (101) of loosing core connects with slide block I (105); The said cylinder installing plate I (102) of loosing core is fixed on two side rails I; Said two side rails I (103) fix with top mold frame (6) by guide rail screw I (104).

3, according to the said a kind of heavy duty trucks gear box low pressure casting die of claim 1, it is characterized in that: said second core-pulling mechanism (2) is made up of the pull bar II (201) of loosing core, the cylinder installing plate II (202) of loosing core, side rails II (203), guide rail screw II (204), slide block II (205), the II of loosing core (206) and guide pad II (207); The II (206) of wherein loosing core links with slide block II (205), and slide block II forms by chute and two side rails II and is slidingly matched; Said guide pad II (207) forms by gathering sill with slide block II (205) and is slidingly matched; The said pull bar II (201) of loosing core connects with slide block II (205); The said cylinder installing plate II (202) of loosing core is fixed on two side rails II; Said two side rails II (203) fix with top mold frame (6) by guide rail screw II (204).

4, according to the said a kind of heavy duty trucks gear box low pressure casting die of claim 1, it is characterized in that: said the 3rd core-pulling mechanism (3), by the pull bar III (301) of loosing core, the cylinder installing plate III (302) of loosing core, side rails III (303), guide rail screw III (304), slide block III (305), the III of loosing core (306) and guide pad III (307) form; The III (306) of wherein loosing core links with slide block III (305), and slide block III forms by chute and two side rails m and is slidingly matched; Said guide pad III (307) forms by gathering sill with slide block III (305) and is slidingly matched; The said pull bar III (301) of loosing core connects with slide block III (305); The said cylinder installing plate III (302) of loosing core is fixed on two side rails III (303), and two side rails III fix with top mold frame (6) by guide rail screw III (304).