Double-layer barrel type precision casting wax injection mold structure

Abstract

The utility model relates to the technical field of precision casting wax injection molds, in particular to a double-layer barrel type precision casting wax injection mold structure which comprises a lower plate and an upper plate, an alignment portion is installed on the lower plate, and a push plate, a plurality of movable mold plates and fixed mold plates are sequentially arranged between the lower plate and the upper plate from bottom to top in a penetrating mode through the alignment portion and locked through screws. And the lower plate is also provided with an inner loose core which penetrates through the push plate and extends to the lower part of the fixed mold plate. According to the double-layer barrel type precision casting wax injection mold structure, by opening the upper plate and the fixed mold plate, a push plate can be jacked up under the action of a push plate spring, meanwhile, a ceramic core and a wax piece are driven to move upwards, then an air cylinder is started to drive a clamping block to return, meanwhile, a middle block can be pushed to move under the action of the spring, a convex column is separated from the wax piece, and automatic core pulling is achieved; and after core pulling, the mold does not need to design an ejector pin and an ejector pin plate, so that the mold development cost is saved, a mold template and core pulling are used as water paths, and the wax piece cooling time is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of precision casting wax injection molds, in particular to a double-layer cylindrical precision casting wax injection mold structure. Background Art

[0002] During the wax injection process, due to the special structure of the double-layer cylindrical casting, the intermediate space is difficult to form a shell, the wax parts are easily deformed, the dimensions are unstable, and the wax injection production efficiency is low. There are three problems in the wax mold production process:

[0003] 1. There is a gap in the middle of the double-layer cylindrical casting. To solve the shell making problem, the gap needs to be designed as a mold structure with a ceramic core;

[0004] 2. The ceramic core needs to be placed manually into the wax mold by the operator, which is prone to tilting during placement, greatly affecting the size of the wax part;

[0005] 3. Since the cavity of double-layer cylindrical castings is relatively deep, the wax part cavity is easy to stick to the mold after the wax injection is completed. It is difficult to manually extract the wax model cavity, which can easily cause the wax part to deform, making the wax injection time long and the production efficiency low. Utility Model Content

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a double-layer cylindrical precision casting wax injection mold structure, comprising a lower plate and an upper plate, wherein the lower plate is provided with an alignment portion, and a push plate, a plurality of movable templates and a fixed template are successively passed through the alignment portion from bottom to top between the lower plate and the upper plate and locked by screws. The lower plate is also provided with an inner core pulling which is passed through the push plate and extends below the fixed template, and a ceramic core is passed through the inner core pulling. The bottom of the fixed template is provided with a fixed mold insert which extends to the top of the inner core pulling and presses the ceramic core downward. The pushing portion is installed between the push plate and the movable template, and clamping blocks slidably connected to the push plate are respectively installed at both ends of the pushing portion, and the two clamping blocks cover the outer side of the ceramic core, and two stoppers are fixed on the bottom of the fixed template, which are respectively attached to the two clamping blocks. A wax injection portion is provided between the push plate and two of the movable templates, and an auxiliary mold portion is provided between the push plate and the fixed template and between the other two movable templates.

[0007] Furthermore, the pushing part includes side plates fixed on the left and right sides of the push plate, and the two side plates are also fixed to the two movable templates on the left and right sides respectively. Cylinders are fixed on both side plates, and the piston rods of the cylinders are fixed to the corresponding clamping blocks.

[0008] Furthermore, the auxiliary mold part includes two side blocks fixed on the push plate, the two side blocks are located between two of the movable mold plates, a positioning block is also fixed on the push plate, an opening adapted to the positioning block is provided between one side of the two clamping blocks, a middle block located between the two side blocks is slidably connected on the push plate, a convex column that passes through the positioning block and extends to the two clamping blocks is installed on one side of the middle block, an outer block that slides with the push plate is provided between the two side blocks, and the outer block is fixed by screws.

[0009] Furthermore, a limit block located below one of the side blocks is fixed on the push plate, and a spring extending into the positioning block is fixed inside the middle block.

[0010] Furthermore, the wax injection part includes a lower block fixed on the push plate, and arc grooves are provided on the lower block and the push plate. An upper block is connected between the push plate and the top of the lower block, and the upper block is fixed by screws. An arc groove is also provided on the bottom of the upper block, and the arc groove of the upper block is relative to the arc grooves on the lower block and the push plate to form a wax injection port.

[0011] Furthermore, a core pulling water channel is provided in the inner core pulling, and an F-shaped template water channel is provided in the lower plate, the push plate and the fixed template, and the template water channel of the lower plate is connected to the core pulling water channel.

[0012] Furthermore, the alignment portion includes a plurality of guide posts fixed on the lower plate, and two relatively distributed guide sleeves are sleeved on the outer sides of the guide posts. The upper guide sleeve is located in the fixed template, and the lower guide sleeve is fixed in the push plate and penetrates the movable template.

[0013] Furthermore, a plurality of push plate springs extending to the bottom of the push plate are fixed inside the lower plate, and a shutter extending to the bottom of the fixed plate is installed inside the four movable platens.

[0014] Furthermore, the same number of fixing rods are fixed in the four movable templates and the fixed template. A sleeve block is fixed to one end of the fixing rod in the movable template, while a top block is fixed to one end of the fixing rod in the fixed template. The top block can be inserted into the sleeve block. Multiple fixing rods are also fixed in the two clamping blocks. A sleeve block is fixed to one end of the fixing rod of one clamping block, and a top block is fixed to one end of the fixing rod of the other clamping block. The top block can also be inserted into the corresponding sleeve block.

[0015] Furthermore, two concave surfaces are formed on the surface of the push plate, and a convex end adapted to the concave surface is formed at the bottom of the ceramic core. A locking plate is fastened between the push plate and the lower plate by screws, and a screw is also screwed into the lower plate.

[0016] Compared with the existing technology, the technical solution of this application has the following beneficial effects:

[0017] The double-layer cylindrical precision casting wax injection mold structure opens the upper plate and the fixed plate, so the push plate will be lifted up by the push plate spring, and the ceramic core and the wax part will be moved upward. Then the cylinder is started to drive the clamping block back. At the same time, the middle block will be pushed to move under the action of the spring, so that the convex column and the wax part are separated to realize automatic core pulling, thereby avoiding manual extraction of the wax model cavity and deformation of the wax part. After core pulling, the mold does not need to be designed with an ejector pin and ejector plate, saving mold development costs. The mold template and core pulling are used as water channels to shorten the cooling time of the wax part. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a rear view of the utility model;

[0020] Figure 3 It is a front cross-sectional view of the utility model;

[0021] Figure 4 It is a right side cross-sectional view of the utility model;

[0022] Figure 5 It is a right side cross-sectional view of the utility model;

[0023] Figure 6 It is a front cross-sectional view of the present utility model.

[0024] In the figure: 1. Lower plate; 2. Guide column; 3. Guide sleeve; 4. Upper plate; 5. Push plate; 6. Moving plate; 7. Fixed plate; 8. Side plate; 9. Cylinder; 10. Clamping block; 11. Stop block; 12. Inner core pulling; 13. Fixed mold insert; 15. Ceramic core; 16. Opener and shutter; 17. Positioning block; 18. Middle block; 19. Spring; 20. Boss; 21. Outer block; 22. Upper block; 23. Lower block; 24. Push plate spring; 25. Side block; 26. Lock plate; 27. Fixed rod; 28. Sleeve block; 29. ​​Top block; 31. Template waterway; 32. Core pulling waterway. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-6In this embodiment, a double-layer cylindrical precision casting wax injection mold structure includes a lower plate 1, a push plate 5 is fixed to the lower plate 1 by a plurality of equal-height screws, four movable templates 6 are placed on the push plate 5, and the four movable templates 6 are locked with the push plate 5 by screws. A fixed template 7 is placed between the tops of the four movable templates 6, and an upper plate 4 is placed above the fixed template 7. The upper plate 4 is fixed to the fixed template 7 by screws. A ceramic core 15 is placed on the push plate 5, and two clamping blocks 10 located outside the ceramic core 15 are slidably connected. An opening is opened between one side of the two clamping blocks 10, and an opening is opened between the other side and the push plate 5. A through opening is formed between the plates 5, and a pushing portion connected to the clamping block 10 is installed on the outer side of the push plate 5. A wax injection portion connected to the through opening is provided between the two movable templates 6 on the front and the push plate 5, and an auxiliary mold portion adapted to the opening is provided between the two movable templates 6 on the back and the push plate 5. An inner core pulling 12 is installed on the top of the lower plate 1, and the inner core pulling 12 is passed through the push plate 5 and extends to the inner side of the ceramic core 15. A fixed mold insert 13 adapted to the top of the inner core pulling 12 and the ceramic core 15 is fixed to the bottom of the fixed template 7, and six push plate springs 24 are fixed inside the lower plate 1.

[0027] In the above structure, the ceramic core is first placed on the push plate on the outside of the inner core pulling, and then the pushing part drives the clamping block to clamp so that the clamping block is located on the outside of the ceramic core. At the same time, the wax injection part and the auxiliary mold part are installed to connect with the clamping block, and then the fixed mold plate and the upper plate are installed and molded in turn. The ceramic core and the inner core pulling are pressed down and positioned by the fixed mold insert to prevent shaking and eccentricity. The material is injected through the wax injection part to form a wax part. After molding, the upper plate and the fixed mold plate are removed. When the gravity of the push plate pressing down is reduced, the push plate will be pushed upward a certain distance under the elastic force of the push plate spring, which can separate the wax part from the inner core pulling, playing the role of automatic core pulling. At the same time, the pushing part can drive the clamping block to retreat, and the auxiliary mold part will automatically pop out and separate from the wax part. At the same time, when the fixed mold plate is taken out, the wax injection part will be opened at any time, which can effectively avoid the deformation of the wax part in the wax model cavity when it is manually extracted.

[0028] Among them, the wax injection part includes a lower block 23 fixed on the push plate 5, and an upper block 22 located above the lower block 23. The upper block 22 is fixed by screws passing through the upper plate and the fixed template 7. The top of the lower block 23 and the bottom of the upper block 22 are both formed with concave surfaces, and the two concave surfaces are combined to form a wax injection port connected to the through port.

[0029] In addition, the front of the push plate 5 and the lower plate 1 are all locked with a locking plate 26 by screws, and a screw is also screwed into one side of the lower plate 1. The locking plate can play a role in limiting and fixing the push plate and the lower plate to prevent offset movement.

[0030] like Figure 3 and 4The push plate 5 has two concave surfaces, and the bottom of the ceramic core 15 has a boss that fits in with the concave surfaces. The two positioning bosses are designed asymmetrically, so if the ceramic core is installed upside down, it will not fit in. This serves as a warning to the operator, preventing them from placing the ceramic core incorrectly and reducing the error rate.

[0031] Among them, the inner core pulling 12 is fixed with a core pulling water channel 32, and the lower plate 1, the push plate 5 and the fixed plate 7 are all provided with a template water channel 31. The template water channel 31 on the lower plate 1 is connected to the core pulling water channel 32. The mold template and the inner core pulling are both equipped with template water channels, which can effectively shorten the cooling time of the wax parts and improve work efficiency.

[0032] At the same time, the same number of fixing rods 27 are fixed in the four movable templates 6 and the fixed template 7. One end of the fixing rod 27 in the movable template 6 is fixed with a sleeve block 28, while one end of the fixing rod 27 in the fixed template 7 is fixed with a top block 29, which can be inserted into the sleeve block 28. A plurality of fixing rods 27 are also fixed in the two clamping blocks 10. One end of the fixing rod 27 of one clamping block 10 is fixed with a sleeve block 28, and one end of the fixing rod 27 of the other clamping block 10 is fixed with a top block 29, which can also be inserted into the corresponding sleeve block 28. When the fixed template is closed, the position of the template can be aligned by docking the sleeve block with the top block, and the collision between the fixed template and the movable template can be effectively reduced. The sleeve block and the top block in the two clamping blocks play the same role as above in correcting the position and causing collision, thereby reducing damage to the mold.

[0033] like Figure 5 and 6 ,by Figure 5In the direction shown, four guide columns 2 are embedded in the bottom of the lower plate 1, and bottom grooves are opened at the bottom of the lower plate 1 and the push plate 5. The bottom groove on the lower plate 1 is connected with the embedded groove of the guide column 2, and the bottom of the guide column 2 is limited and supported in the bottom groove by tightening the screws. Two relative guide sleeves 3 are sleeved on the outer side of the guide column 2, and the outer sides of the four guide sleeves 3 below are sleeved with the push plate 5, and the bottom groove on the push plate 5 is connected with the penetrated end of the push plate 5. The bottom groove on the push plate 5 also limits the support of the guide sleeve 3 below by screwing in screws. The four movable templates 6 are respectively sleeved with the four guide sleeves 3 below, and the outer sides of the four guide sleeves 3 above are sleeved with the fixed template 7. Guide pins provide guidance, facilitating precise alignment of the push plate, movable platen, and fixed platen during mold closing, thereby ensuring the quality of the molded product. Guide sleeves prevent direct contact between the push plate, movable platen, and fixed platen, causing wear and damage. If only guide pins were present but no guide sleeves, they could come into direct contact with the mold surface during mold closing. This would not only accelerate guide pin wear but also damage the mold surface, impacting product precision and quality. Furthermore, without the guidance of guide sleeves, alignment accuracy during mold closing would be significantly reduced, increasing the risk of mold misalignment and, in turn, impacting the dimensional stability and appearance quality of the final product.

[0034] like Figure 4 The auxiliary mold part includes two side blocks 25 fixed on the push plate 5, and a limit block located below one of the side blocks 25. The two side blocks 25 are located between the two movable mold plates 6 on the left. A positioning block 17 located in the opening of the clamping block 10 is fixed on the push plate 5. The positioning block 17 is provided with a through hole and a hole groove. An outer block 21 is provided between the two side blocks 25, and a middle block 18 sliding between the two side blocks 25 and the push plate 5. The screws pass through the upper plate 4 and the fixed mold plate 7 in turn to lock the outer block 21. A boss 20 extending through the through hole to the opening is fixed to the right side of the middle block 18, and a spring 19 is fixed inside the middle block 18. One end of the spring 19 extends into the hole groove and is compressed. When the wax piece is separated from the inner core pulling, the outer block is then moved out. The outer block mainly serves to limit the middle block. When the outer block is moved out, the elastic force of the spring will push the middle block outward until it contacts the limit block, thereby preventing the middle block from flying out. At the same time, under the push of the elastic force of the spring, the boss can be separated from the wax piece, thereby completing the core pulling operation.

[0035] Among them, Figure 6 In the figure, each of the four movable platens 6 is equipped with a shutter 16 extending to the bottom of the fixed platen 7. When the mold is opened, the upper plate is first removed, thereby reducing the weight of the fixed platen. Then, under the action of the shutter, the shutter lifts the fixed platen through the ejector pins, allowing the fixed mold insert to separate from the wax piece, inner core and ceramic core. At the same time, the fixed platen will also move above the outer block, making it easier to push the outer block out through the middle block, which can significantly improve production efficiency, reduce manual intervention, and lower production costs.

[0036] like Figure 1-3 ,by Figure 1 In the direction shown, the pushing section includes side plates 8 fixed to the left and right sides of the push plate 5 by screws. The two side plates 8 are respectively fixed to the two movable platens 6 on the left and right sides by screws. Cylinders 9 are installed on the side plates 8, and the piston rods of cylinders 9 are fixed to the corresponding clamping blocks 10. When the fixed platen is moved out, the clamping blocks are driven back by the cylinders, thereby separating the clamping blocks from the wax part and completing the separation of the wax part.

[0037] Among them, the bottom of the fixed template 7 is fixed with two stoppers 11 that are attached to the clamping block 10 when the mold is closed. The stoppers can limit the clamping block in the closed mold state to prevent the clamping block from deflecting and affecting the wax part molding during the process of mold closing and wax injection.

[0038] The working principle of the above embodiment is:

[0039] When the mold is in the closed state, wax is injected from the mold wax injection port, and the wax part is combined with the ceramic core. The template water channel and the core pulling water channel shorten the cooling time of the wax part. After the wax part is formed, the screws of the locking plate are unscrewed and the upper plate is removed. The mold is opened. Under the action of the push plate spring, the push plate is pushed up, and the inner core pulling is separated from the wax part. At the same time, after the upper plate is moved out, the screws of the outer block are also unscrewed. Then, under the action of the opener, the upper part of the fixed template will be raised to a certain height, so that the fixed mold insert is separated from the wax part and also from the outer block. The elastic force of the spring pushes out the middle block and the outer block at the same time. The middle block is limited by the limit block, so that the convex column is separated from the wax part, and then the fixed template is moved out. At this time, the stop block is separated from the clamping block, and the cylinder drives the clamping block to retract. The clamping block is separated from the wax part, and the operator takes out the wax part and the ceramic core as a whole. In the open mold state, the operator puts the ceramic core into the mold cavity, the mold is closed, and the mold proceeds to the next wax injection cycle.

[0040] The entire workflow is complete, and all contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0041] It should be noted that in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0042] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-layer cylindrical precision casting wax injection mold structure, characterized by: The invention comprises a lower plate (1) and an upper plate (4), wherein the lower plate (1) is provided with an alignment portion, and a push plate (5), a plurality of movable platens (6) and a fixed platen (7) are sequentially provided between the lower plate (1) and the upper plate (4) from bottom to top through the alignment portion and locked by screws, and the lower plate (1) is also provided with an inner core (12) provided through the push plate (5) and extending to the bottom of the fixed platen (7), and a ceramic core (15) provided through the inner core (12) is provided on the push plate (5), and a ceramic core (15) is provided at the bottom of the fixed platen (7) and extends to the top of the inner core (12) and connects the ceramic core (15) to the inner core (12). 15) is pressed down by a fixed mold insert (13), a pushing portion is installed between the push plate (5) and the movable mold plate (6), and clamping blocks (10) slidably connected to the push plate (5) are respectively installed at both ends of the pushing portion, and the two clamping blocks (10) cover the outer side of the ceramic core (15), and two stoppers (11) respectively abutting against the two clamping blocks (10) are fixed to the bottom of the fixed mold plate (7), a wax injection portion is provided between the push plate (5) and two of the movable mold plates (6), and an auxiliary mold portion is provided between the push plate (5) and the fixed mold plate (7) and between the other two movable mold plates (6).

2. A double-layer cylindrical precision casting wax injection mold structure according to claim 1, characterized in that: The pushing portion includes side plates (8) fixed on the left and right sides of the pushing plate (5), and the two side plates (8) are also fixed to the two movable templates (6) on the left and right sides respectively. Cylinders (9) are fixed on both side plates (8), and the piston rods of the cylinders (9) are fixed to corresponding clamping blocks (10).

3. The double-layer cylindrical precision casting wax injection mold structure according to claim 2, characterized in that: The auxiliary mold part includes two side blocks (25) fixed on the push plate (5), the two side blocks (25) are located between two movable mold plates (6), a positioning block (17) is also fixed on the push plate (5), an opening adapted to the positioning block (17) is opened between one side of the two clamping blocks (10), a middle block (18) located between the two side blocks (25) is slidably connected to the push plate (5), a convex column (20) is installed on one side of the middle block (18) and is penetrated by the positioning block (17) and extends to the two clamping blocks (10), an outer block (21) is provided between the two side blocks (25) and is slidable with the push plate (5), and the outer block (21) is fixed by screws.

4. The double-layer cylindrical precision casting wax injection mold structure according to claim 3, characterized in that: A limiting block located below one of the side blocks (25) is fixed on the push plate (5), and a spring (19) extending into the positioning block (17) is fixed inside the middle block (18).

5. The double-layer cylindrical precision casting wax injection mold structure according to claim 1, characterized in that: The wax injection part comprises a lower block (23) fixed on the push plate (5), an arc groove is provided on the lower block (23) and the push plate (5), an upper block (22) is butted between the tops of the push plate (5) and the lower block (23), the upper block (22) is fixed by screws, and an arc groove is also provided on the bottom of the upper block (22), and the arc groove of the upper block (22) is opposite to the arc grooves on the lower block (23) and the push plate (5) to form a wax injection port.

6. The double-layer cylindrical precision casting wax injection mold structure according to claim 1, characterized in that: The inner core pulling (12) is provided with a core pulling water channel (32), and the lower plate (1), the push plate (5) and the fixed template (7) are all provided with an F-shaped template water channel (31), and the template water channel (31) of the lower plate (1) is connected to the core pulling water channel (32).

7. The double-layer cylindrical precision casting wax injection mold structure according to claim 1, characterized in that: The alignment portion comprises a plurality of guide posts (2) fixed on the lower plate (1), two guide sleeves (3) arranged opposite to each other are sleeved on the outer sides of the guide posts (2), the upper guide sleeve (3) being located in the fixed template (7), and the lower guide sleeve (3) being fixed in the push plate (5) and passing through the movable template (6).

8. The double-layer cylindrical precision casting wax injection mold structure according to claim 1, characterized in that: A plurality of push plate springs (24) extending to the bottom of the push plate (5) are fixed inside the lower plate (1), and a shutter (16) extending to the bottom of the fixed plate (7) is installed inside the four movable platens (6).

9. The double-layer cylindrical precision casting wax injection mold structure according to claim 8, characterized in that: The same number of fixing rods (27) are fixed in the four movable templates (6) and the fixed template (7). One end of the fixing rod (27) in the movable template (6) is fixed with a sleeve block (28), while one end of the fixing rod (27) in the fixed template (7) is fixed with a top block (29). The top block (29) can be inserted into the sleeve block (28). The two clamping blocks (10) are also fixed with multiple fixing rods (27). One end of the fixing rod (27) of one clamping block (10) is fixed with a sleeve block (28), and one end of the fixing rod (27) of the other clamping block (10) is fixed with a top block (29). The top block (29) can also be inserted into the corresponding sleeve block (28).

10. The double-layer cylindrical precision casting wax injection mold structure according to claim 1, characterized in that: The push plate (5) has two concave surfaces on its surface, and the bottom of the ceramic core (15) is formed with a convex end adapted to the concave surfaces. A locking plate (26) is fastened between the push plate (5) and the lower plate (1) by screws, and a screw is also screwed into the lower plate (1).

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