A structure of a die block of a lost foam of a gearbox casting

Abstract

The utility model discloses a gearbox casting lost foam's mould piece structure relates to lost foam casting technical field, this gearbox casting lost foam's mould piece structure includes: first mould piece is the round -corner rectangular groove shape structure, and top is equipped with the first through -hole of vertical through, second mould piece is the round -corner rectangular structure that upper and lower both ends are equipped with the opening, is equipped with the second through -hole corresponding first through -hole, and first through -hole and second through -hole combination get annular groove, movable piece group, including intermediate movable piece and movable movable piece, intermediate movable piece is cross -shaped structure, and intermediate movable piece is with annular groove's axis collinear, movable movable piece abuts on the lateral wall of intermediate movable piece along the radial direction of annular groove. The utility model discloses through the alignment connection of first mould piece and second mould piece and form annular groove, then complete quick stripping through the movable connection between intermediate movable piece and movable movable piece, realize two big piece structure technology can complete the stripping of lost foam white mould, and the cumulative error is little, and production efficiency is high, and the technical effect with low forming process cost.

Description

Technical Field

[0001] This utility model relates to the field of lost foam casting technology, and in particular to a mold structure for lost foam casting of gearbox parts. Background Technology

[0002] Lost foam casting, also known as solid pattern casting, involves first preparing a foam plastic model (called a white model) according to the EPC process. The foam plastic is then placed in a sand box, and casting is performed under vacuum, causing the foam plastic model to vaporize and disappear, replaced by metal. Currently, in lost foam casting production of gearboxes, the white model generally adopts a "three-piece structure": the end cover surface to the middle cover surface mold piece, the middle cover surface to the cylinder bottom surface mold piece, and the cylinder bottom surface to the mating surface mold piece.

[0003] The existing white mold body structure is complex, with the cylinder bottom plane serving as the machining reference surface for all dimensions. The tolerance of the mating surface is twice that of the cylinder bottom unevenness tolerance. Due to the characteristic that the annular groove structure inside the gearbox cannot be demolded in a conventional manner, foundry manufacturers and mold factories commonly use three large sheets of powder, which requires each gearbox body to be molded three times. This results in a large number of bonded mold pieces, leading to a significant cumulative error. Furthermore, the efficiency of manual or automatic bonding of the three-piece structure is low. Therefore, the traditional "three-piece structure" molding process is costly and has low production efficiency.

[0004] Therefore, there is a need for a lost foam casting process mold structure that has low process cost and high production efficiency. Utility Model Content

[0005] The main purpose of this invention is to provide a mold structure for lost foam casting of gearbox parts, aiming to solve the problems of high process cost and low production efficiency of existing lost foam casting.

[0006] To achieve the above objectives, the present invention proposes a lost foam casting template structure for gearbox castings, comprising:

[0007] The first mold piece is a rounded rectangular groove structure with an opening facing downwards, and the top surface of the first mold piece is provided with a vertically penetrating first through hole.

[0008] The second module is a rounded rectangular structure with openings at both the top and bottom. The second module has a second through hole corresponding to the first through hole. The first through hole and the second through hole are coaxial. The first through hole and the second through hole are combined to form an annular groove. The first module and the second module are connected.

[0009] The movable block assembly includes a central movable block and a movable movable block. The central movable block has a cross-shaped structure and is inserted through the annular groove along its axis. The central movable block is collinear with the axis of the annular groove. The movable movable block abuts against the side wall of the central movable block along the radial direction of the annular groove. The movable movable block is movably connected to the first mold piece and / or the second mold piece.

[0010] Preferably, the lost foam casting structure of the gearbox casting further includes an auxiliary mold piece group, which includes a fixing piece and a shaping piece. The fixing piece is arranged in a vertical direction. The first mold piece and the second mold piece are provided with shaping surfaces corresponding to the fixing pieces. One side of the fixing piece abuts against the shaping surface. The first mold piece and the second mold piece are connected through the fixing piece.

[0011] Preferably, the shaping piece further includes a first small piece, a second small piece, and a third small piece. The first small piece has a circular structure, is disposed inside the second mold piece and covers the port of the second through hole. The second small piece and the third small piece are mirror images disposed inside the second mold piece at one end away from the first mold piece. The first small piece is connected to the second mold piece through the second small piece and the third small piece.

[0012] Preferably, the movable block includes a fixed mold block and a moving mold block, and there are multiple fixed mold blocks and multiple moving mold blocks. The intermediate block has multiple flat surfaces and curved surfaces, and the flat surfaces and the curved surfaces are connected in sequence. The normal of the flat surface is set at an angle of 30° to 60° with the axis of the intermediate block. Multiple moving mold blocks abut against the flat surfaces of the intermediate block. Multiple fixed mold blocks are evenly spaced from the moving mold blocks, and the fixed mold blocks abut against the curved surfaces of the intermediate block.

[0013] Preferably, a guide slope is provided between the intermediate movable block and the movable movable block, and two adjacent guide slopes are mirrored and enclosed to form a dovetail groove.

[0014] Preferably, the lost foam casting structure of the gearbox part further includes a base plate and a gear assembly. The base plate abuts against the bottom surface of the second mold piece, and the gear assembly is disposed on the top surface of the base plate. The gear assembly has a cross-shaped structure, and the axis of the gear assembly is collinear with the axis of the second through hole. The gear assembly is connected to the fixed mold block.

[0015] This invention forms an annular groove by aligning and connecting the first and second mold pieces. The shape of the casting is achieved through the movable connection between the middle movable block and the movable movable block. When the middle movable block and the movable movable block are separated, the casting can be automatically and quickly demolded. This invention achieves the technical effect of demolding the lost foam white mold using only two large-piece structure processes, with small cumulative error, high production efficiency, and low molding process cost. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is an exploded structural diagram of the lost foam casting mold structure of a gearbox casting according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the second module in one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the template structure and cylinder of one embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of the first and second modules in one embodiment of the present invention;

[0021] Figure 5 This is a top view of the intermediate movable block in one embodiment of the present invention;

[0022] Figure 6 This is a top view of the fixed mold block according to an embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the structure of the movable mold block in one embodiment of the present invention.

[0024] Explanation of icon numbers:

[0025] 1000 Lost foam casting pattern structure for gearbox parts 100 First template 110 First through hole 200 Second template 210 Second through hole 300 Annular groove 400 Live block group 410 Middle block 420 Movable blocks 421 Fixed mold block 422 Moving mold block 430 dovetail groove 500 Auxiliary module group 510 Fixing plate 511 First fixing plate 512 Second fixing plate 520 Styling photos 521 First small piece 522 Second small piece 523 Third small piece 524 Fourth piece 525 Fifth piece 600 base plate 700 Gear Set 800 cylinder

[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that all directional indicators in this embodiment are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0029] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0030] like Figures 1-7 As shown, this utility model proposes a mold plate structure 1000 for lost foam casting of gearbox parts, including: a first mold plate 100, which is a rounded rectangular groove structure with an opening facing downwards, and the top surface of the first mold plate 100 is provided with a vertically penetrating first through hole 110; a second mold plate 200, which is a rounded rectangular structure with openings at both the top and bottom ends, and the second mold plate 200 is provided with a second through hole 210 corresponding to the first through hole 110. The first through hole 110 and the second through hole 210 are coaxial and combined. An annular groove 300 is obtained, and the first mold piece 100 is connected to the second mold piece 200; a movable block group 400 is formed, which includes a middle movable block 410 and a movable movable block 420. The middle movable block 410 has a cross-shaped structure and is inserted through the annular groove 300 along the axis of the annular groove 300. The middle movable block 410 is collinear with the axis of the annular groove 300. The movable movable block 420 abuts against the side wall of the middle movable block 410 along the radial direction of the annular groove 300. The movable movable block 420 is movably connected to the first mold piece 100 and / or the second mold piece 200.

[0031] In this embodiment, the white mold of the lost foam casting of the gearbox part is formed by connecting the first mold piece 100 and the second mold piece 200 to enclose the space in the first mold piece 100 and the second mold piece 200. The z-axis section of the first mold piece 100 is an inverted U-shaped groove, and a vertically downward through hole 110 is provided on the top surface of the first mold piece 100. The space inside the first mold piece 100 communicates with the outside through the first through hole 110. The second mold piece 200 is a groove structure with z-shaped openings at the top and bottom, and the bottom end of the second mold piece 200 is connected to the base plate 600. The second mold plate 200 has a coaxial second through hole 210 with the same diameter corresponding to the first through hole 110. The second mold plate 200 and the first through hole 110 and the second through hole 210 in the first mold plate 100 form an annular groove 300 to complete the shape of the casting. The middle movable block 410 in the movable block group 400 is connected to the cylinder 800. The middle movable block 410 can be vertically lifted and lowered from the first through hole 110 by the cylinder 800. The movable block 420 is set in the annular groove 300 and abuts against the middle movable block 410 to realize the shape of the gearbox casting. When demolding is required, the operator drives the cylinder 800, which is mounted on the base plate 600 and vertically positioned, to lift the middle movable block 410 upward from the annular groove 300. During the lifting process, the movable block 420, which is in contact with the middle movable block 410, moves radially towards the center of the annular groove 300, causing the movable block 420 to demold from the first mold piece 100 and the second mold piece 200. This completes the demolding process of the lost foam white mold, achieving interference-free molding of the two large mold box annular groove 300 structure, significantly reducing molding and manufacturing costs and minimizing cumulative errors.

[0032] In detail, after the first mold piece 100 and the second mold piece 200 are aligned, the operator applies cold glue to the contact surface of the first mold piece 100 and the second mold piece 200, and then the first mold piece 100 and the second mold piece 200 are bonded together. After the cold glue cures, the first mold piece 100 and the second mold piece 200 are assembled, and the overall white mold of the gearbox casting can be obtained inside.

[0033] In one embodiment, the mold structure 1000 of the lost foam casting of the gearbox part further includes an auxiliary mold group 500. The auxiliary mold group 500 includes a fixing piece 510 and a shaping piece 520. The fixing piece 510 is arranged in a vertical direction. The first mold piece 100 and the second mold piece 200 are provided with shaping surfaces corresponding to the fixing piece 510. One side of the fixing piece 510 abuts against the shaping surface. The first mold piece 100 and the second mold piece are connected through the fixing piece 510.

[0034] In this embodiment, the fixing piece 510 includes a first fixing piece 511 and a second fixing piece 512. The first fixing piece 511 is a rectangular structural piece disposed along the height direction of the first mold piece 100 and the second mold piece 200. The second fixing piece 512 is a rectangular structural piece extending along the length of the second mold piece 200 and disposed within the second mold piece 200. The first fixing piece 511 and the second fixing piece 512 abut against each other. The outer shell of the first mold piece 100 and the second mold piece 200 is provided with a shaping surface corresponding to the shape of the first fixing piece 511. The first fixing piece 511 is attached to the connection point of the outer surface of the first mold piece 100 and the second mold piece 200 in the vertical direction to limit and connect the first mold piece 100 and the second mold piece 200. The second fixing piece 512 is disposed inside the second mold piece 200 and has an opening at the bottom end of the shaping surface of the second mold piece 200 corresponding to the first fixing piece 511, so that the first fixing piece 511 can pass through the opening and abut against the second fixing piece 512. The second fixing piece 512 abuts against the inner wall of the second mold piece 200 and is used to limit and position the first fixing piece 511.

[0035] In one embodiment, the shaping piece 520 further includes a first small piece 521, a second small piece 522, and a third small piece 523. The first small piece 521 has a circular structure, is disposed inside the second mold piece 200, and covers the port of the second through hole 210. The second small piece 522 and the third small piece 523 are mirror images disposed inside the second mold piece 200 at one end away from the first mold piece 100. The first small piece 521 is connected to the second mold piece 200 through the second small piece 522 and the third small piece 523.

[0036] In this embodiment, the first small piece 521 is covered by the lower opening of the second through hole 210 and fixed by the second small piece 522 and the third small piece 523 abutting against the inner wall of the second mold piece 200. The first small piece 521, the second small piece 522, and the third small piece 523 are used to make the white mold form the detailed configuration that is difficult to form in the second mold piece 200. The second small piece 522 and the third small piece 523 are both L-shaped and mirrored along the axis of the length direction of the second mold piece 200. The second small piece 522 and the third small piece 523 are provided with locking protrusions to hold and fix the first small piece 521.

[0037] In detail, the mold structure 1000 also includes a fourth small piece 524 and a fifth small piece 525. The fourth small piece 524 is a semi-circular structural piece, and the fifth small piece 525 is an arc-shaped structural piece, both of which are located at the top of the first small piece 521 to form the micro-structures that are difficult to cast in the gearbox casting. It can be understood that casting in small pieces facilitates the assembly and fixing of the first mold piece 100 and the second mold piece 200, achieving the technical effect of optimizing the white mold structure without affecting the strength and rigidity of the first mold piece 100 and the second mold piece 200.

[0038] In one embodiment, the movable block 420 includes a fixed mold block 421 and a moving mold block 422. There are multiple fixed mold blocks 421 and multiple moving mold blocks 422. The intermediate block 410 is provided with multiple flat surfaces and curved surfaces. The flat surfaces and curved surfaces are connected in sequence. The normal of the flat surface is set at an angle of 30° to 60° with the axis of the intermediate block 410. The multiple moving mold blocks 422 abut against the flat surfaces of the intermediate block 410. The multiple fixed mold blocks 421 and the moving mold blocks 422 are evenly spaced apart, and the fixed mold blocks 421 abut against the curved surfaces of the intermediate block 410.

[0039] In this embodiment, as Figures 5-7 As shown, there are four fixed mold blocks 421 and four moving mold blocks 422. The moving mold blocks 422 abut against the flat surface of the cross-shaped middle block 410, and the fixed mold blocks 421 abut against the curved surface of the middle block 410 along the gap of the moving mold blocks 422. In this embodiment, the flat surface of the middle block 410 forms a 30° angle with its own axis. When the middle block 410 is lifted vertically upward by the cylinder 800, the moving mold blocks 422 automatically move towards the axis of the annular groove 300, thereby realizing the automatic demolding of the moving mold blocks 422.

[0040] In one embodiment, a guide slope is provided between the middle movable block 410 and the movable movable block 420, and two adjacent guide slopes are mirrored and enclosed to form a dovetail groove 430.

[0041] In this embodiment, a dovetail groove 430 is provided between the movable block 420, which is obtained by combining the fixed mold block 421 and the movable mold block 422, and the intermediate block 410. This is to prevent the intermediate block 410 and the movable block 420 from being too tightly joined during the demolding process, which would make demolding difficult. The dovetail groove 430 facilitates demolding.

[0042] In one embodiment, the lost foam casting mold structure 1000 of the gearbox casting further includes a base plate 600 and a gear assembly 700. The base plate 600 abuts against the bottom surface of the second mold piece 200, and the gear assembly 700 is disposed on the top surface of the base plate 600. The gear assembly 700 has a cross-shaped structure, and the axis of the gear assembly 700 is collinear with the axis of the second through hole 210. The gear assembly 700 is connected to the fixed mold movable block 421.

[0043] In this embodiment, the gear assembly 700 is connected to the fixed mold block 421 and can drive the fixed mold block 421 to move radially along the annular groove 300. When the middle block 410 is lifted, the moving mold block 422 automatically demolds, and the fixed mold block 421 is demolded by the gear assembly 700 set on the base plate 600. Specifically, the top of the gear assembly 700 is provided with a wear-resistant movable pin, and the gear assembly 700 is provided with a movable groove along the radial direction of the annular groove 300. The movable pin can move along the movable groove, and the bottom of the four fixed mold blocks 421 is connected to the movable pin, which drives the fixed mold blocks 421 to move.

[0044] This invention uses a first mold piece and a second mold piece to form an annular groove inside, and a fixed piece and a shaping piece to shape the fine structure. The casting is demolded by the movable connection between the middle movable block and the movable movable block. When the middle movable block and the movable movable block separate, the demolding can be completed automatically and quickly. This invention achieves the technical effect of demolding the lost foam white mold of the gearbox casting with only two large-piece structure process, with small cumulative error, high production efficiency and low molding process cost.

[0045] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A mold structure for lost foam casting of a gearbox, characterized in that, include: The first mold piece is a rounded rectangular groove structure with an opening facing downwards, and the top surface of the first mold piece is provided with a vertically penetrating first through hole. The second mold piece is a rounded rectangular structure with openings at both the top and bottom. The second mold piece has a second through hole corresponding to the first through hole. The first through hole and the second through hole are coaxial. The first through hole and the second through hole are combined to form an annular groove. The first mold piece and the second mold piece are connected. The movable block assembly includes a central movable block and a movable movable block. The central movable block has a cross-shaped structure and is inserted through the annular groove along its axis. The central movable block is collinear with the axis of the annular groove. The movable movable block abuts against the side wall of the central movable block along the radial direction of the annular groove. The movable movable block is movably connected to the first mold piece and / or the second mold piece.

2. The mold structure for the lost foam casting of the gearbox as described in claim 1, characterized in that, The lost foam casting structure of the gearbox casting also includes an auxiliary mold plate group, which includes a fixing plate and a shaping plate. The fixing plate is arranged in a vertical direction. The first mold plate and the second mold plate are provided with shaping surfaces corresponding to the fixing plates. One side of the fixing plate abuts against the shaping surface. The first mold plate and the second mold plate are connected through the fixing plate.

3. The mold structure for the lost foam casting of the gearbox as described in claim 2, characterized in that, The shaping piece also includes a first small piece, a second small piece, and a third small piece. The first small piece has a circular structure, is disposed inside the second mold piece and covers the port of the second through hole. The second small piece and the third small piece are mirror images disposed inside the second mold piece at one end away from the first mold piece. The first small piece is connected to the second mold piece through the second small piece and the third small piece.

4. The mold structure for the lost foam casting of the gearbox as described in claim 1, characterized in that, The movable block includes a fixed mold block and a moving mold block, and there are multiple fixed mold blocks and multiple moving mold blocks. The intermediate block has multiple flat surfaces and curved surfaces, and the flat surfaces and curved surfaces are connected in sequence. The normal of the flat surface is set at an angle of 30° to 60° with the axis of the intermediate block. Multiple moving mold blocks abut against the flat surfaces of the intermediate block. Multiple fixed mold blocks are evenly spaced from the moving mold blocks, and the fixed mold blocks abut against the curved surfaces of the intermediate block.

5. The mold structure for the lost foam casting of the gearbox as described in claim 4, characterized in that, A guide slope is provided between the intermediate movable block and the movable movable block, and two adjacent guide slopes are mirrored and enclosed to form a dovetail groove.

6. The mold structure for the lost foam casting of the gearbox as described in claim 5, characterized in that, The lost foam casting structure of the gearbox part further includes a base plate and a gear assembly. The base plate abuts against the bottom surface of the second mold piece. The gear assembly is disposed on the top surface of the base plate. The gear assembly has a cross-shaped structure. The axis of the gear assembly is collinear with the axis of the second through hole. The gear assembly is connected to the fixed mold block.

Images