CN210754981U

CN210754981U - Shifting drum groove casting loam core structure

Info

Publication number: CN210754981U
Application number: CN201921544842.8U
Authority: CN
Inventors: 徐士杰; 代洪波
Original assignee: Hangzhou Jietu Transmission Parts Co ltd
Current assignee: Hangzhou Jietu Transmission Parts Co ltd
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2020-06-16
Anticipated expiration: 2029-09-17

Abstract

The utility model discloses a shift drum groove casting loam core structure, including columniform central authorities 'loam core and with central authorities' loam core complex combination loam core. All parts of the casting sand core are connected by virtue of the connecting structure, so that the binder is prevented from generating gaps due to thermal expansion.

Description

Shifting drum groove casting loam core structure

Technical Field

The utility model belongs to the technical field of the casting technique and specifically relates to a dial fender drum groove casting loam core structure is related to.

Background

The casting sand core is a common tool in the casting field, the casting sand core is usually prepared by raw sand and a binder (water glass, resin and the like) in a core box manually or by machines (such as a core blowing machine, a core shooting machine and the like), the use of the binder can generate gaps, generate flashes and influence the quality of parts, and meanwhile, the casting sand core is formed in an integral molding mode, so that the manufacturing difficulty of the complex structure in the casting sand core is increased, for example, the casting sand core disclosed in Chinese patent literature has a publication number of CN203737944U, an oil channel is arranged in the casting sand core, the oil channel is a reducing channel, and the cross section sizes of two end parts of the oil channel are smaller than the cross section size of the middle part. The casting loam core that this scheme used is structure as an organic whole, and seam crossing adopts the binder to connect, and the binder of seam crossing is heated the inflation easily when the casting, influences off-the-shelf precision.

Disclosure of Invention

The utility model relates to an overcome current casting loam core and adopt the binder to connect in the junction to lead to the binder thermal expansion in the casting process, produce the problem in clearance, provide a shift drum groove casting loam core structure, the connection of casting loam core each part does not rely on the binder, avoids producing the gap.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a shifting drum groove casting loam core structure comprises a cylindrical central loam core and a combined loam core matched with the central loam core, wherein the central loam core comprises a loam core body and a tray, the loam core body is fixedly connected with the upper end face of the tray, the side ring face of the loam core body is provided with a convex key for positioning in the circumferential direction and a first casting groove corresponding to the shifting drum groove structure, the edge of the tray is provided with a flange for limiting the combined loam core, the combined loam core comprises a first loam core, a second loam core, a third loam core and a fourth loam core, the lower end faces of the first loam core, the second loam core, the third loam core and the fourth loam core, which are contacted with the tray, are respectively provided with a first groove matched with the flange structure, the two side end faces of the first loam core are respectively provided with a first side key, the side end faces of the second loam core and the third loam core, which are contacted with the first loam core, are respectively provided with a first side key structure matched with the first side groove, the end faces, far away from the first loam core, of the second loam core and the third loam core are respectively provided with a second side key, the end faces, at two sides, of the fourth loam core are respectively provided with a second side groove matched with the second side key structure, the second side groove is provided with an opening at the lower end face of the fourth loam core, the inner annular faces of the first loam core, the second loam core, the third loam core and the fourth loam core are respectively provided with a second casting groove corresponding to the shift drum groove structure, and the inner annular faces of the second loam core and the third loam core are respectively provided with a second groove matched with the convex key structure at the corresponding positions. The casting loam core is used as a mould when the shift drum groove is cast, and the connection strength after assembly and the assembly precision need to be considered so as to ensure that the internal dimension of the casting loam core meets the casting requirement of the shift drum groove. According to the scheme, the casting loam core is divided into two large structures, namely a central loam core and four combined loam cores which are used as assembly bases of the section mould and other parts of the section mould, the cavity between the central loam core and the combined loam core is a casting cavity, and meanwhile, a first casting groove and a second casting groove are respectively machined on the outer annular surface of the loam core body and the inner annular surface of the combined loam core so as to correspond to the structural shape on the shifting drum groove. The flange at the edge of the tray is matched with the first groove of the lower end face of the combined sand core, so that basic positioning between the first sand core, the second sand core, the third sand core, the fourth sand core and the central sand core is realized, and meanwhile, the connection strength between the combined sand core and the central sand core is increased, so that the acting force of high-temperature liquid on the inner walls of all parts of the cast sand core in the casting sand core is borne during casting, and the disintegration of the high-temperature liquid is avoided. The convex key of the side ring surface of the loam core body is matched with the second grooves on the inner ring surfaces of the second loam core and the third loam core, and the second loam core and the third loam core are circumferentially positioned in a sliding mode during assembly, so that the first side grooves of the second loam core and the third loam core can be accurately matched with the first side key of the first loam core, and meanwhile, the loam core body, the second loam core and the third loam core are fixed in the axial direction, so that the central loam core is prevented from being separated from the combined loam core along the axial direction. The second side keys on the second sand core and the third sand core can be inserted into the second side grooves of the fourth sand core along the axial direction, so that the fourth sand core can be assembled with the second sand core and the third sand core.

Preferably, the cross section of the second side key is trapezoidal, and the width of the joint of the second side key and the second core as well as the third core is smaller. The connection mode between second side key and the second side groove is for pegging graft, and the opening in second side groove is located the lower terminal surface department of fourth loam core, and this scheme is established the shape of second side key into the cross-section and is trapezoidal cylinder, its trapezoidal narrower be one end rather than second loam core or third loam core link to each other, cooperation second side groove can be when both peg graft, is difficult to deviate from the notch department in second side groove.

Preferably, a locking structure is arranged between the central sand core and the combined sand core, the locking structure comprises a locking groove and a locking ring arranged in the locking groove, the locking groove comprises an annular groove arranged on the lower end face of the tray, a first through groove is formed in the inner wall of the annular groove, a second through groove is formed in the corresponding position of the first sand core, the second sand core, the third sand core and the fourth sand core, the first through groove and the second through groove are communicated with each other, the locking ring comprises a ring body and a plurality of locking assemblies, and each locking assembly comprises a touch mechanism, a connecting rod and a supporting block. Because the cast sand core is separated from the shift drum groove in a damage mode after casting, the cast sand core is usually molded by materials such as molding sand, and because of the properties of the materials, the strength of a connecting structure between the central sand core and the combined sand core is limited, and the connecting part is easily affected by external force to be disassembled or generate cracks, a locking groove is arranged at the connecting part of the central sand core and the combined sand core, a locking ring is arranged in the locking groove, and the structural strength of the locking ring is utilized to realize the increase of the connecting strength between each component of the cast sand core. Because the scheme relates to the splicing of two groove bodies, in particular to the splicing of a first through groove and a first mud core, a second mud core, a third mud core and a fourth mud core of a tray between second through grooves respectively, the precision of the splicing is limited because the material of the cast mud core cannot carry out high-precision groove body processing, and the precision matching between the inner walls of the groove bodies cannot be realized, aiming at the situation, the scheme sets the size of a ring body of a locking ring to be smaller than the size of a corresponding groove body, and a certain movement redundancy exists between the locking ring and the inner wall of the locking groove, so that the locking ring can be conveniently placed into the locking groove, a contact mechanism in the ring body of the locking ring is utilized to activate a supporting block, the supporting block extends out of the surface of the ring body of the locking ring, supports a gap between the locking ring and the locking groove, and the locking ring is completely in a tight connection state with the inner wall of, the locking ring can strengthen the connection between each component of the casting loam core.

Preferably, the ring body is located in the annular groove, a first opening is formed in the end face of the ring body, which is close to one end of the bottom surface of the annular groove, a second opening is formed in the outer ring surface of the ring body, which is close to the first through groove, the contact mechanism comprises a first contact block and a second contact block, the first contact block is located in the first opening, the connecting rod comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is fixedly connected with the first contact block, a plurality of first bayonets are formed in a rod body of the first connecting rod, the supporting block comprises a first supporting block and a second supporting block, the first supporting block is located in the second opening, a first sliding rod is fixedly connected to one end face of the first supporting block, a first clamping groove matched with the first bayonets is formed in a corresponding position on the rod body of the first sliding rod, a return spring is arranged between the sliding rod and the ring body, and, the rod body of the second slide bar is also provided with a second clamping groove matched with the first clamping groove at a corresponding position, the second support block is positioned in a first window formed in the ring body, a third support block is arranged in the first support block and positioned in a second window formed in the first support block, one end of the third support block is fixedly connected with a third slide bar, the third slide bar is provided with a third clamping groove, a reset spring is arranged between the third slide bar and the first support block, a third opening is formed in the end face, close to the second through groove, of the end face of the bottom face of the third support block, the second contact block is positioned in the third opening, one end of the second contact block is fixedly connected with a second connecting rod, and a second clamping groove matched with the third clamping groove is formed in the position, close to the third clamping groove, of the second connecting rod. The first contact block in the ring body can excite the first connecting rod to move when the locking ring is extruded with the bottom of the annular groove by means of external force, so that the connection between the first bayonet and the first clamping groove and the second clamping groove is unlocked, the first supporting block and the second supporting block are respectively popped out of the surface of the ring body under the action of respective reset springs, the second supporting block supports the inner wall of the annular groove, the first supporting block extends into the first through groove and the second through groove, when the second contact block is extruded with the bottom of the second through groove, the second connecting rod is pushed to unlock the second bayonet and the third clamping groove, the third supporting block is popped out under the action of the reset springs of the third supporting block and supports the inner wall of the second through groove, so that the locking groove is completely connected with the locking ring, and the locking groove strengthens the connection between all parts of the casting mud core by means of the structural strength of the locking groove and the fixation between the inner walls of.

Preferably, the central core and the combined core matched with the central core are resin sand molding structures. The resin sand is molding sand or core sand in which synthetic resin is used as a binder of sand grains. After a mold or core is made of resin sand, the resin is cured by an irreversible crosslinking reaction by the action of a curing agent, thereby imparting necessary strength to the mold or core.

Preferably, the number of the locking assemblies is four, and the locking assemblies are uniformly distributed along the circumferential direction. The four locking assemblies respectively correspond to the first sand core, the second sand core, the third sand core and the fourth sand core.

And a boss for positioning is arranged on the outer annular surface of the first sand core, the second sand core, the third sand core or the fourth sand core. This boss is used for circumferential positioning in the sandbox.

Therefore, the utility model discloses following beneficial effect has: (1) all parts of the casting sand core are connected by virtue of a connecting structure, so that a gap generated by the thermal expansion of a binder is avoided; (2) the locking ring increases the connection strength among all parts of the casting loam core in the locking groove; (3) the size of the locking ring is smaller than the corresponding size of the locking groove, and the locking ring is fixed by the expansion of the supporting block, so that the problem that the locking ring cannot be inserted into the locking groove due to the low machining precision of the locking groove is avoided.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a cross-sectional view of one of the latch integration sites of the present invention.

Fig. 3 is a cross-sectional view of the first support block of the present invention.

Fig. 4 is a schematic structural view of the first bayonet of the present invention.

Fig. 5 is an exploded view of the present invention.

In the figure: 1. the combined loam core comprises a central loam core 2, a combined loam core 3, a locking structure 4, a ring body 5, an annular groove 6, a first through groove 7, a second through groove 8, a first contact block 9, a first opening 10, a first supporting block 11, a first connecting rod 12, a first sliding rod 13, a second supporting block 14, a second sliding rod 15, a first bayonet 16, a first clamping groove 17, a return spring 18, a second clamping groove 19, a second contact block 20, a third opening 21, a second connecting rod 22, a third sliding rod 23, a third clamping groove 24, a second bayonet 25, a third supporting block 26, a loam core body 27, a tray 28, a flange 29, a convex key 30, a first groove 31, a first side groove 32, a second loam core 33, a second side key 34, a second side groove 35, a second groove 36, a first side key 37, a first loam core 38, a third loam core 39, a first through groove 7, a second through groove 8, a, A fourth loam core 40, a boss.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Examples

In the embodiment shown in fig. 1, 2, 3, 4 and 5, a shift drum groove casting core structure comprises a casting core molded by resin sand and a locking structure 3 for reinforcing connection, the casting core comprises a central core 1 and four combined cores 2, the cavity between the central core 1 and the combined cores 2 is a casting cavity, the central core 1 comprises a tray 27 and a core body 26 integrally molded with the tray 27, a flange 28 is arranged at the edge of the tray 27, a first casting groove and a second casting groove are respectively machined on the outer annular surface of the core body 26 and the inner annular surface of the combined cores 2 to correspond to the structural shape on the shift drum groove, two convex keys 29 are further arranged on the outer annular surface of the core body 26, the combined cores 2 are a first core 37, a second core 32, a third core 38 and a fourth core 39 respectively, the lower end surfaces of the four cores are provided with a first groove 30, the inner annular surfaces of the second sand core 32 and the third sand core 38 are also provided with a second groove 35, the two side end surfaces of the first sand core 37 are respectively provided with a first side key 36, the side end surfaces of the second sand core 32 and the third sand core 38 close to the first sand core 37 are respectively provided with a first side groove 31, the side end surfaces of the second sand core 32 and the third sand core 38 far away from the first sand core 37 are respectively provided with a second side key 33, and the side end surfaces of the fourth sand core 39 are respectively provided with a second side groove 34. The locking structure 3 comprises a locking groove and a locking ring, the locking groove comprises an annular groove 5 arranged on the lower end face of the tray 27 and a first through groove 6 arranged on the inner wall of the annular groove 5 close to one end of the combined loam core 2, and meanwhile, the locking structure also comprises a second through groove 7 arranged on the inner annular surface of the combined loam core 2, and the second through groove 7 is communicated with the first through groove 6. The main body of the locking ring is a ring body 4, four locking assemblies are arranged on the ring body 4 at equal intervals, each locking assembly can play a role independently, wherein a first opening 9 is arranged on the end face of one end, close to the bottom of the annular groove 5, of the ring body 4, a first contact block 8 is arranged in the first opening 9, a first connecting rod 11 is welded at one end, far away from the bottom of the annular groove 5, of the first contact block 8, three first bayonets 15 are arranged on the rod body of the first connecting rod 11, a first sliding rod 12 penetrates through one first bayonet 15, a second sliding rod 14 penetrates through the other two first bayonets 15 respectively, a first clamping groove 16 matched with the first bayonet 15 is arranged on the rod body of the first sliding rod 12, a return spring 17 is arranged between the first sliding rod 12 and the ring body 4, a second clamping groove 18 is arranged on the rod body of the second sliding rod 14, and a return spring 17 is also arranged between, one end of the first sliding rod 12 close to the first through groove 6 is welded with a first supporting block 10, a second opening is formed in the surface of the ring body 4 and used for placing the first supporting block 10, the end portions of the two second sliding rods 14 are also welded with a second supporting block 13 respectively, the directions of the two second supporting blocks 13 are opposite and correspond to the inner walls of the inner side and the outer side of the annular groove 5 respectively, and the corresponding positions of the ring body 4 are provided with first windows respectively and used for achieving placing and extending of the second supporting blocks 13. A third opening 20 is formed in the end face, close to the bottom of the second through groove 7, of the first supporting block 10, a second contact block 19 is arranged in the third opening 20, a second connecting rod 21 is welded at one end, far away from the bottom of the second through groove 7, of the second contact block 19, the second connecting rod 21 is divided into two parts in the first supporting block 10, a second bayonet 24 is arranged on each part, a third sliding rod 22 penetrates through each second bayonet 24, the two third sliding rods 22 are connected with the first supporting block 10 through return springs 17, a third supporting block 25 is welded at one end, close to the inner wall of the second through groove 7, of each of the two third sliding rods 22, a second window is formed in the corresponding end face surface of the first supporting block 10, the two second windows correspond to one of the two opposite inner walls of the second through groove 7, and the third supporting block 25 is located in the corresponding second window. A boss 40 for positioning is provided on the outer circumferential surface of the fourth core 39.

When the cast core needs to be assembled, the first core 37 is firstly placed at a position between the two convex keys 29, the first groove 30 on the lower end surface of the first core 37 is matched with the flange 28 to realize the positioning of the first core 37, the first grooves 30 on the lower end surfaces of the second core 32 and the third core 38 are matched with the flange 28, the second core 32 and the third core 38 are slid to make the two abut against the two side end surfaces of the first core 37 respectively, the first side keys 36 on the two side end surfaces of the first core 37 are matched with the first side grooves 31 on the second core 32 and the third core 38 respectively, and the flange 28 is slid into the second groove 35 on the inner annular surface of the second core 32 and the third core 38. And finally, inserting a fourth sand core 39 between the second sand core 32 and the third sand core 38, respectively inserting the second side keys 33 on the side end surfaces of the second sand core 32 and the third sand core 38 into the second side grooves 34 on the two side end surfaces of the fourth sand core 39, and sliding the fourth sand core 39 downwards, so that the first groove 30 on the lower end surface of the fourth sand core 39 is matched with the flange 28, and finishing the assembly of the casting sand core.

The ring body 4 of the locking ring is placed into the annular groove 5, the ring body 4 is pressed down with force, so that the first contact block 8 and the groove bottom of the annular groove 5 are extruded and retracted inwards into the first opening 9, the first connecting rod 11 is driven to move inwards, the upper end of the first bayonet 15 on the first connecting rod 11 is embedded into the first clamping groove 16 on the rod body of the first slide rod 12 and is embedded into the second clamping groove 18 on the rod body of the second slide rod 14, the lower end of the first bayonet 15 has a certain distance with the rod bodies of the first slide rod 12 and the second slide rod 14, when the first connecting rod 11 moves, the upper end of the first bayonet 15 is separated from the first clamping groove 16 and the second clamping groove 18, at the moment, the first slide rod 12 and the second slide rod 14 are not limited by any locking mechanism, the first slide rod 12 pushes the first support block 10 to pass through the second opening and slide into the first through groove 6 and the second through groove 7 under the push of the respective return spring 17, two second sliding bars 14 push the respective second supporting blocks 13 to pass through the first windows, abut against the inner wall of the annular groove 5 in opposite directions, and generate static friction by the abutting pressure, thereby completing the fixation of the ring body 4 in the annular groove 5.

When the first supporting block 10 enters the first through groove 6 and the second through groove 7, the second contact block 19 at the top of the first supporting block and the groove bottom of the second through groove 7 are extruded, under the extrusion action, the second contact block 19 moves towards the third opening 20, the second connecting rod 21 moves along with the second contact block, the two second bayonets 24 on the second connecting rod 21 are respectively pulled out of the third bayonets 23 on the two third sliding rods 22, one end of each second bayonet 24 is originally embedded into the third bayonet 23 on the rod body of the third sliding rod 22, the other end of each second bayonet 24 has a certain distance with the rod body of the third sliding rod 22, when the second connecting rod 21 moves, one end of each second bayonet 24 is pulled out of the third bayonet 23, at this time, the third sliding rod 22 is not restricted by any part, under the push of the return spring 17, the two third sliding rods 22 push the third supporting blocks 25 at the respective ends to pass through the respective second windows, and abut against the inner wall of the second through groove 7 in the opposite direction, the fixing of the first support block 10 in the second through groove 7 is completed by the static friction generated by the pressure against.

Claims

1. A shifting drum groove casting loam core structure comprises a cylindrical central loam core and a combined loam core matched with the central loam core, and is characterized in that the central loam core comprises a loam core body and a tray, the loam core body is fixedly connected with the upper end face of the tray, the side ring face of the loam core body is provided with a convex key for circumferential positioning and a first casting groove corresponding to the shifting drum groove structure, the edge of the tray is provided with a flange for limiting the combined loam core, the combined loam core comprises a first loam core, a second loam core, a third loam core and a fourth loam core, the lower end faces of the first loam core, the second loam core, the third loam core and the fourth loam core, which are contacted with the tray, are respectively provided with a first groove matched with the flange structure, the two side end faces of the first loam core are respectively provided with a first side key, the second loam core and the third loam core are respectively provided with a first side end face, which is contacted with the first loam core, which is matched with the first side key structure, the end faces, far away from the first loam core, of the second loam core and the third loam core are respectively provided with a second side key, the end faces, at two sides, of the fourth loam core are respectively provided with a second side groove matched with the second side key structure, the second side groove is provided with an opening at the lower end face of the fourth loam core, the inner annular faces of the first loam core, the second loam core, the third loam core and the fourth loam core are respectively provided with a second casting groove corresponding to the shift drum groove structure, and the inner annular faces of the second loam core and the third loam core are respectively provided with a second groove matched with the convex key structure at the corresponding positions.

2. The structure of a shifting drum groove casting loam core according to claim 1, wherein the cross section of the second side key is trapezoidal, and the width of the joint of the second side key and the second loam core as well as the third loam core is smaller.

3. The shifting drum groove casting loam core structure according to claim 1, wherein a locking structure is arranged between the central loam core and the combined loam core, the locking structure comprises a locking groove and a locking ring arranged in the locking groove, the locking groove comprises an annular groove arranged on the lower end surface of the tray, a first through groove is arranged on the inner wall of the annular groove, a second through groove is arranged at the corresponding position of the first loam core, the second loam core, the third loam core and the fourth loam core, the first through groove and the second through groove are communicated with each other, the locking ring comprises a ring body and a plurality of locking assemblies, and the locking assemblies comprise a touch mechanism, a connecting rod and a supporting block.

4. The cast loam core structure of claim 3, wherein the ring body is located in the annular groove, the end surface of the ring body near the bottom surface of the annular groove is provided with a first opening, the outer ring surface of the ring body near the first through groove is provided with a second opening, the contact mechanism comprises a first contact block and a second contact block, the first contact block is located in the first opening, the connecting rod comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is fixedly connected with the first contact block, a plurality of first bayonets are arranged on the rod body of the first connecting rod, the supporting block comprises a first supporting block and a second supporting block, the first supporting block is located in the second opening, one end surface of the first supporting block is fixedly connected with a first sliding rod, a first clamping groove matched with the first bayonet is arranged at a corresponding position on the rod body of the first sliding rod, and a return spring is arranged between the sliding rod and the ring body, the end face of one end of the second supporting block is provided with a second sliding rod, a second clamping groove matched with the first clamping groove is also formed in the corresponding position on the rod body of the second sliding rod, the second supporting block is located in a first window formed in the ring body, a third supporting block is arranged in the first supporting block and located in a second window formed in the first supporting block, one end of the third supporting block is fixedly connected with a third sliding rod, a third clamping groove is formed in the third sliding rod, a reset spring is arranged between the third sliding rod and the first supporting block, a third opening is formed in the end face, close to the bottom face of the second through groove, of the third supporting block, the second contact block is located in the third opening, one end of the second contact block is fixedly connected with a second connecting rod, and a second clamping groove matched with the third clamping groove is formed in the position, close to the third clamping groove, of the second connecting rod.

5. The structure of a deflector drum casting core as claimed in claim 1, wherein the central core and the combined core engaged with the central core are resin sand molded structures.

6. The structure of a shifting drum groove casting loam core according to claim 4, wherein the number of the locking assemblies is four, and the locking assemblies are uniformly distributed along the circumferential direction.

7. The structure of a shifting drum groove casting core according to any one of claims 1 to 6, wherein the outer annular surface of the first core, the second core, the third core or the fourth core is provided with a boss for positioning.