Precoated sand casting tool
By using a worm gear, worm wheel, lead screw, and reverse lead screw transmission system, the problem of the inability of coated sand casting tooling to self-adaptively clamp and adjust height was solved, achieving precise clamping and multi-faceted machining, and improving machining accuracy and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2026-03-31
AI Technical Summary
Existing coated sand casting fixtures cannot adaptively clamp workpieces of different sizes, especially those with different axial through-hole sizes, and their height cannot be adjusted to adapt to the position requirements of different processing equipment, resulting in low processing accuracy and efficiency.
The system employs a worm gear, worm wheel, and lead screw transmission system, combined with a reverse lead screw and gear transmission, to achieve height and angle adjustment of the workpiece fixing seat. It can precisely clamp workpieces of different sizes through expansion components, and ensure lifting stability through guide rods and limit blocks, thereby reducing the number of clamping operations.
It improves machining accuracy and efficiency, ensures the appropriate distance and position between the workpiece and the machining tool, adapts to a variety of machining equipment, reduces the number of clamping operations, and enhances the versatility and stability of the tooling.
Smart Images
Figure CN224059239U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coated sand casting processing technology, specifically a coated sand casting tooling. Background Technology
[0002] Coated sand castings refer to metal castings made by using coated sand as the molding material and through a series of casting processes. In the field of machinery and equipment manufacturing, coated sand castings are often used to manufacture pump covers, pump housings and other parts such as motor end covers, water pumps and oil pumps. Their surfaces usually have circular through holes.
[0003] These castings are only blanks after completion and require subsequent processing to meet the requirements of dimensional accuracy and surface quality. For example, they need to be precision machined by boring, reaming or grinding, so fixtures and tooling are required.
[0004] In the process of realizing this utility model, the inventors discovered the following problems with the existing technology: 1. Some existing tooling uses fixed dimensions or a relatively simple clamping method, which cannot effectively self-adaptively clamp coated sand castings of different sizes, especially workpieces with different axial through hole sizes; 2. Some existing tooling cannot adjust the height, which makes it difficult to place the workpiece in the optimal processing position when cooperating with milling machines, grinding machines and other equipment of different heights, thus limiting the scope of application of the tooling. Utility Model Content
[0005] The purpose of this utility model is to provide a tooling for coated sand castings, to solve the problem mentioned in the background art that using fixed dimensions or relatively simple clamping methods cannot achieve effective adaptive clamping. To achieve the above objective, this utility model provides the following technical solution: a tooling for coated sand castings, including a mounting base and a workpiece fixing base, the workpiece fixing base being slidably connected to the inner wall of the mounting base, a turntable being rotatably connected to the surface of the workpiece fixing base, a reverse lead screw being rotatably connected to the surface of the turntable, and an expansion component being threadedly connected to the outer wall of the reverse lead screw.
[0006] The mounting base is rotatably connected to a worm and a worm wheel, respectively. The worm and the worm wheel are meshed together. A lead screw is provided above the worm wheel. The shaft at the bottom of the lead screw is fixedly connected to the shaft at the center of the worm wheel. A guide rod is fixedly connected inside the mounting base.
[0007] The workpiece fixing seat consists of a disc and a column. Gear A and gear B are rotatably connected inside the disc of the workpiece fixing seat. Gear A and gear B are meshed together. The shaft at the center of gear B is fixedly connected to the center point of the disc. Limiting blocks are provided at both ends of the outer wall of the column of the workpiece fixing seat.
[0008] The expansion assembly consists of a first nut disc and a second nut disc, which are respectively threaded to the outer wall of the reverse lead screw. A first lifting block is rotatably connected to the outer wall of the first nut disc, and a second lifting block is rotatably connected to the outer wall of the second nut disc. The first lifting block and the second lifting block are rotatably connected by a bushing.
[0009] More preferably, the column of the workpiece fixing seat has a through threaded groove, which is threaded to the outer wall of the lead screw, and circular through holes for sliding connection of the guide rod are provided at both ends of the threaded groove. The through holes are through and extend to the bottom of the workpiece fixing seat disk, and the workpiece fixing seat forms a helical transmission structure through the lead screw.
[0010] In a further preferred embodiment, the workpiece fixing seat forms a lifting structure with the inner wall of the mounting seat via a lead screw, and the inner wall of the mounting seat is provided with sliding grooves on both sides for sliding connection of the limiting block, and the outer wall of the mounting seat is provided with mounting holes at both ends.
[0011] More preferably, a handle integrally connected to gear A is rotatably connected to one side of the outer wall of the workpiece fixing seat, and the turntable forms a rotating structure along the center point of the disc surface of the workpiece fixing seat through gear B.
[0012] More preferably, the first nut disc and the second nut disc form a horizontal transmission structure through a reverse lead screw, and there is relative motion between the first nut disc and the second nut disc.
[0013] More preferably, the first lifting block is equidistant from the center point of the first nut disc axis at 120° intervals, and the second lifting block is equidistant from the center point of the second nut disc axis at 120° intervals.
[0014] More preferably, the first lifting block and the second lifting block are H-shaped and symmetrically distributed at both ends of the bottom of the arc-shaped liner. The first lifting block and the second lifting block move relative to each other through the movement of the first nut disc and the second nut disc. At the same time, the liner itself forms an opening and closing structure, and the surface of the liner is covered with raised strip-shaped rubber strips.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0016] In this invention, the tooling uses a worm gear, worm wheel, and lead screw transmission system to precisely adjust the height of the workpiece fixing seat to adapt to the positional differences of the processing ends of different processing equipment. During the lifting process, the guide rod engages with the circular through hole on the column, and the limiting block slides in the groove on the inner wall of the mounting seat, ensuring the stability of the lifting of the workpiece fixing seat. This ensures that the blank workpiece and the processing tool maintain a suitable distance and relative position, greatly improving the processing accuracy and providing a stable and reliable foundation for the processing.
[0017] In this invention, the first and second nut discs are driven to move relative to each other by a reverse lead screw, which in turn drives the first and second lifting blocks, which are equiangularly distributed and H-shaped, to precisely adjust the tension of the liner blocks and tightly fit the axial through holes of workpieces of different sizes, thus achieving a secure clamping. Furthermore, when multi-faceted processing is required, the operator can turn the handle and use gear transmission to make the turntable drive the workpiece to rotate, eliminating the need for re-clamping, reducing the number of clamping operations, and significantly improving processing efficiency. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the unfolded structure of the present invention.
[0019] Figure 2 This is a schematic diagram of the closed structure of the present invention from the main view.
[0020] Figure 3 This is a schematic diagram of the expansion component structure of this utility model;
[0021] Figure 4 This is a schematic diagram of the internal structure of the mounting base of this utility model.
[0022] In the diagram: 1. Mounting base; 101. Worm gear; 102. Worm wheel; 103. Lead screw; 104. Guide rod; 2. Workpiece fixing seat; 201. Gear A; 202. Gear B; 203. Limiting block; 3. Turntable; 4. Reverse lead screw; 5. Expansion assembly; 501. First nut disc; 502. Second nut disc; 503. First lifting block; 504. Second lifting block; 505. Liner block. Detailed Implementation
[0023] 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 skilled in the art without creative effort are within the protection scope of the present utility model.
[0024] Please see Figures 1 to 4 This utility model provides a technical solution: a tooling for coated sand casting, including a mounting base 1 and a workpiece fixing base 2. The workpiece fixing base 2 is slidably connected to the inner wall of the mounting base 1. A turntable 3 is rotatably connected to the surface of the workpiece fixing base 2. A reverse screw 4 is rotatably connected to the surface of the turntable 3. An expansion component 5 is threadedly connected to the outer wall of the reverse screw 4.
[0025] The mounting base 1 is rotatably connected to a worm gear 101 and a worm wheel 102. The worm gear 101 and the worm wheel 102 are meshed together. A lead screw 103 is provided above the worm wheel 102. The shaft at the bottom of the lead screw 103 is fixedly connected to the shaft at the center of the worm wheel 102. A guide rod 104 is fixedly connected inside the mounting base 1.
[0026] The workpiece fixing seat 2 consists of a disc and a column. Inside the disc of the workpiece fixing seat 2, gear A 201 and gear B 202 are rotatably connected. Gear A 201 and gear B 202 are meshed together. The shaft at the center of gear B 202 is fixedly connected to the center point of the turntable 3. Limiting blocks 203 are provided at both ends of the outer wall of the column of the workpiece fixing seat 2.
[0027] The expansion assembly 5 consists of a first nut disc 501 and a second nut disc 502. The first nut disc 501 and the second nut disc 502 are respectively threaded to the outer wall of the reverse lead screw 4. The outer wall of the first nut disc 501 is rotatably connected to a first lifting block 503, and the outer wall of the second nut disc 502 is rotatably connected to a second lifting block 504. The first lifting block 503 and the second lifting block 504 are rotatably connected to each other through a bushing 505.
[0028] In this embodiment, as Figure 4 As shown, the column of the workpiece fixing seat 2 has a through threaded groove, which is threaded to the outer wall of the lead screw 103. At both ends of the threaded groove, there are circular through holes for sliding connection of the guide rod 104. The through holes are through and extend to the bottom of the disc of the workpiece fixing seat 2. The workpiece fixing seat 2 forms a helical transmission structure through the lead screw 103. Since the surface processing end positions of different processing equipment are different, the lifting and lowering of the workpiece fixing seat 2 through the lead screw 103 can provide precise height adjustment. This precise height adjustment helps to ensure that the distance and relative position between the blank workpiece and the processing tool meet the processing requirements, thereby improving the processing accuracy.
[0029] In this embodiment, as Figure 4 As shown, the workpiece fixing seat 2 forms a lifting structure with the inner wall of the mounting seat 1 via the lead screw 103. The inner wall of the mounting seat 1 has grooves on both sides for sliding connection of the limiting block 203, and the outer wall of the mounting seat 1 has mounting holes at both ends. The mounting holes at both ends of the outer wall of the mounting seat 1 allow the fixture to be easily fixed to external equipment, such as the worktable of a milling machine or grinding machine, by means of bolts or other connecting parts. When the workpiece fixing seat 2 moves up and down under the helical transmission structure of the lead screw 103, the corresponding through holes on both sides slide on the outer wall of the guide rod 104, while the limiting block 203 slides in the limiting groove, which greatly increases the stability of the workpiece fixing seat 2 during the lifting process.
[0030] In this embodiment, as Figure 3As shown, a handle integrally connected to gear A 201 is rotatably connected to one side of the outer wall of the workpiece fixing seat 2. The turntable 3 forms a rotating structure along the center point of the disc surface of the workpiece fixing seat 2 via gear B 202. The presence of the handle allows the operator to precisely control the rotation angle of the workpiece according to the processing requirements. For example, when the blank workpiece needs to be processed at multiple angles, the operator can slowly and precisely turn the handle to rotate the workpiece to the appropriate angle each time, thereby meeting the accuracy requirements of different processing positions. The turntable 3 forms a rotating structure along the center point of the disc surface of the workpiece fixing seat 2 via gear B 202, so that the workpiece on the outer wall of the expansion component 5 can rotate accordingly. After the processing of one side is completed, there is no need to disassemble and clamp the workpiece again. Just turn the handle to allow the other sides of the workpiece to enter the processing position in sequence, which greatly reduces the number of clamping times.
[0031] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the first nut disc 501 and the second nut disc 502 form a horizontal transmission structure through the reverse screw 4, and there is relative motion between the first nut disc 501 and the second nut disc 502. When the reverse screw 4 rotates, the first nut disc 501 and the second nut disc 502 will move relative to each other according to a precise linear relationship, which can accurately control the position of the first nut disc 501 and the second nut disc 502, thereby realizing the precise adjustment of the expansion component 5 and ensuring that the liner 505 can accurately adapt to workpieces of different sizes.
[0032] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the first lifting block 503 is equidistantly distributed at 120° intervals around the axis of the first nut disc 501, and the second lifting block 504 is equidistantly distributed at 120° intervals around the axis of the second nut disc 502. When clamping the workpiece, due to the equidistant distribution of the first lifting block 503 and the second lifting block 504, the clamping force they apply can be evenly distributed on the circumference. This helps to evenly transmit the clamping force to the workpiece through the liner 505 and support the workpiece.
[0033] In this embodiment, as Figure 1 , Figure 2 and Figure 3As shown, the first lifting block 503 and the second lifting block 504 are H-shaped and symmetrically distributed at both ends of the bottom of the arc-shaped liner 505. The first lifting block 503 and the second lifting block 504 move relative to each other through the movement of the first nut disc 501 and the second nut disc 502. Simultaneously, the liner 505 itself forms an opening and closing structure, and its surface is covered with raised strip-shaped rubber strips. The shape of the first lifting block 503 and the second lifting block 504 provides good stability and strength. During the lifting process of the liner 505, the H-shaped structure can more effectively withstand the pressure from the workpiece, preventing the first lifting block 503 and the second lifting block 504 from deforming or breaking under stress. The two branches of the H-shaped structure can better fit the bottom of the liner 505, making the liner 505 more stable during the rising process, thus providing stable support for the workpiece. When the size of the axial through hole of the workpiece changes, the movement of the first nut disc 501 and the second nut disc 502 drives the relative movement of the first lifting block 503 and the second lifting block 504, thereby adjusting the opening and closing degree of the liner 505, ensuring that the liner 505 effectively clamps and supports the workpiece. This flexible opening and closing range makes the fixture applicable to a variety of coated sand castings of different sizes, enhancing the versatility of the fixture. The presence of the rubber strip increases the friction between the liner 505 and the workpiece, further increasing the firmness of the workpiece clamping.
[0034] The method of use and advantages of this utility model: When using this coated sand casting tooling, the working process is as follows:
[0035] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, firstly, using the mounting holes at both ends of the outer wall of the mounting base 1, the fixture is securely fixed to the worktable of external processing equipment such as milling machines and grinding machines with bolts. The blank workpiece is then fitted onto the outer wall of the annularly distributed liner blocks 505 through the through hole in the middle. The servo motor inside the turntable 3 is started, driving the reverse lead screw 4 to rotate. The first nut disc 501 and the second nut disc 502, which are moving in opposite directions, will slowly approach each other. At this time, one end of the first lifting block 503 distributed outside the first nut disc 501 and the second lifting block 504 distributed outside the second nut disc 502 gradually moves from a horizontal state towards the first lifting block 503 distributed outside the first nut disc 501 and the second lifting block 504 distributed outside the second nut disc 502. The first lifting block 503 and the second lifting block 504 are H-shaped and symmetrically distributed at both ends of the bottom of the arc-shaped liner 505. Therefore, they will lift the liner 505. The operator can adjust the tension of the liner 505 according to the transmission position of the first nut disc 501 and the second nut disc 502, as well as the rotation angle of the first lifting block 503 and the second lifting block 504. This allows for corresponding adjustments based on the size of the through hole in the workpiece's shaft, firmly supporting the workpiece. Simultaneously, the raised rubber strips covering the surface of the liner 505 increase the friction between it and the inner wall of the workpiece's shaft hole. Force is applied to further ensure the firmness of the workpiece clamping; when the tooling needs to be installed on different processing equipment for processing, due to the different processing end positions of the equipment, the worm gear 101 rotates through the servo motor, causing the worm wheel 102 to rotate and drive the lead screw 103 above it to rotate. When the lead screw 103 rotates, the column at the bottom of the workpiece fixing seat 2 will gradually rise or fall to achieve height adjustment. During the lifting and lowering process of the workpiece fixing seat 2, the limit blocks 203 on both sides slide in the grooves on the inner wall of the mounting seat 1, playing a guiding and limiting role, greatly increasing the stability during the lifting and lowering process. Once the workpiece is positioned appropriately, the workpiece blank on the outer wall of the expansion component 5 can be processed using external processing equipment. When the workpiece blank needs to be processed on multiple sides, the operator rotates the handle on one side of the outer wall of the workpiece fixing seat 2 disc, which is integrally connected to gear A 201, so that gear A 201 drives gear B 202 to rotate, and finally drives the turntable 3, which is coaxially connected to gear B 202, to rotate. When the turntable 3 rotates, it drives the reverse lead screw 4 and the workpiece on the surface of the expansion component 5 to rotate, so that different sides of the workpiece are in the processing position in sequence. This eliminates the need to re-clamp the workpiece, reduces the number of clamping operations, and improves processing efficiency.
[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A coated sand casting tooling comprising a mounting base (1) and a workpiece holder (2), characterised in that: The workpiece fixing seat (2) is slidingly connected to the inner wall of the mounting seat (1), the surface of the workpiece fixing seat (2) is rotatably connected with a rotating disc (3), the surface of the rotating disc (3) is rotatably connected with a reverse lead screw (4), and the outer wall of the reverse lead screw (4) is threadedly connected with an expansion assembly (5). The inner part of the mounting seat (1) is rotatably connected with a worm (101) and a worm wheel (102), the worm (101) is meshingly connected with the worm wheel (102), the upper part of the worm wheel (102) is provided with a lead screw (103), the shaft head at the bottom of the lead screw (103) is fixedly connected with the shaft rod at the shaft center of the worm wheel (102), and the inner part of the mounting seat (1) is fixedly connected with a guide rod (104). The workpiece fixing seat (2) is composed of a disc and a column, the inner part of the disc of the workpiece fixing seat (2) is rotatably connected with an A gear (201) and a B gear (202), the A gear (201) and the B gear (202) are meshingly connected, the shaft rod at the shaft center of the B gear (202) is fixedly connected with the shaft center point of the rotating disc (3), and the outer wall of the column of the workpiece fixing seat (2) is provided with a limiting block (203) at both ends. The expansion assembly (5) is composed of a first nut disc (501) and a second nut disc (502), the first nut disc (501) and the second nut disc (502) are respectively threadedly connected to the outer wall of the reverse lead screw (4), the outer wall of the first nut disc (501) is rotatably connected with a first jacking block (503), the outer wall of the second nut disc (502) is rotatably connected with a second jacking block (504), and the first jacking block (503) and the second jacking block (504) are rotatably connected through a lining block (505).
2. The coated sand casting tooling of claim 1, wherein: The column of the workpiece fixing seat (2) is provided with a penetrating threaded groove, the threaded groove is threadedly connected with the outer wall of the lead screw (103), circular through holes for slidingly connecting the guide rod (104) are provided at both ends of the threaded groove, the through holes are in a penetrating type and extend to the lower part of the disc of the workpiece fixing seat (2), and the workpiece fixing seat (2) forms a screw transmission structure through the lead screw (103).
3. The coated sand casting tooling of claim 1, wherein: The workpiece fixing seat (2) forms a lifting structure through the lead screw (103) and the inner wall of the mounting seat (1), sliding grooves for slidingly connecting the limiting blocks (203) are provided at both sides of the inner wall of the mounting seat (1), and mounting holes are provided at both ends of the outer wall of the mounting seat (1).
4. The coated sand casting tooling of claim 1, wherein: The outer wall of the disc of the workpiece fixing seat (2) is rotatably connected with a handle integrally connected with the A gear (201) on one side, and the rotating disc (3) forms a rotating structure through the B gear (202) along the surface shaft center point of the disc of the workpiece fixing seat (2).
5. The coated sand casting tooling of claim 1, wherein: The first nut disc (501) and the second nut disc (502) form a horizontal transmission structure through the reverse lead screw (4), and relative motion is formed between the first nut disc (501) and the second nut disc (502).
6. The coated sand casting tooling of claim 1, wherein: The first jacking blocks (503) are equiangularly distributed with a 120° interval and centered on the axial points of the first nut plates (501), and the second jacking blocks (504) are equiangularly distributed with a 120° interval and centered on the axial points of the second nut plates (502).
7. The coated sand mold casting tooling of claim 1, wherein: The first jacking blocks (503) and the second jacking blocks (504) are in an H shape and symmetrically distributed at the two ends of the bottom of the arc-shaped pad (505), and the first jacking blocks (503) and the second jacking blocks (504) constitute relative movement through the movement of the first nut plates (501) and the second nut plates (502), while the pad (505) itself constitutes an opening and closing structure, and the surface of the pad (505) is covered with convex strip-shaped rubber strips.