Automatic centering and rotating fixture for medical casting products

Abstract

The utility model relates to medical casting processing fixture field especially is a kind of medical casting product automatic centering rotation processing fixture, including bottom plate and compression assembly, bottom plate is fixedly connected in the side of connecting plate, the upper end surface of bottom plate is fixedly connected with positioning assembly;Positioning assembly includes locating block and locating post, wherein locating block is used to resist the side edge of processing part, locating post is used to pass through the through hole of pre-processing on processing part;Compression assembly is set in the upper end surface of bottom plate;The utility model is positioned with the cooperation of locating block and locating post, realizes the single-hole positioning and side edge orientation of processing part, solves the positioning difficult problem caused by the structure characteristics of medical casting, guarantees the centering accuracy when clamping;By setting compression assembly, three point lifting cooperation pressing plate is compressed from above and laterally compressed by lateral compression, stress balance, can reduce the extrusion deformation or stress deformation of medical casting this kind of easy deformation workpiece in clamping process due to uneven stress.

Description

Technical Field

[0001] This utility model relates to the field of medical casting processing fixtures, specifically an automatic centering rotary processing fixture for medical casting products. Background Technology

[0002] Medical castings are key structural components in the field of medical equipment. They are typically made of biocompatible materials such as stainless steel and titanium alloys. Castings, especially those used for motor mounting guide housings, are mainly used to position and stabilize the motor, ensuring that the power output direction of the motor is stable and without deviation during operation. This, in turn, ensures that the actuators of the connected medical equipment can run according to the predetermined trajectory and force. The structural precision and surface quality of these castings directly affect the safety and functional stability of the medical equipment, thus requiring extremely high precision in the machining process.

[0003] Currently, there are several problems in the processing of medical castings. Firstly, their irregular shapes mean that traditional fixtures rely on manual adjustment for precise centering, leading to positioning deviations that affect subsequent dimensional accuracy. Secondly, medical castings are often made of materials with a certain degree of toughness, and some have thin walls. Traditional fixtures, using single-point clamping or rigid clamping, can cause localized stress concentration, resulting in extrusion deformation or residual stress, damaging the original shape and accuracy of the casting. This necessitates additional correction processes, increasing processing costs and time. Furthermore, medical castings often require machining features such as holes, grooves, and curved surfaces in different directions. Traditional fixtures lack rotation capabilities, requiring multiple disassemblies and repositioning, which is not only cumbersome and inefficient but also increases the scrap rate due to accumulated errors from repeated clamping. Utility Model Content

[0004] The purpose of this invention is to provide an automatic centering rotary machining fixture for medical casting products, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An automated centering rotary machining fixture for medical casting products includes: A base plate is fixedly connected to the side of a connecting plate, and a positioning component is fixedly connected to the upper end face of the base plate for positioning the processed parts. The positioning component includes a positioning block and a positioning post. The positioning block is used to abut against the side of the workpiece, and the positioning post is used to pass through a pre-machined through hole on the workpiece. Through the cooperation of the positioning block and the positioning post, the single-hole positioning and side orientation of the workpiece can be achieved. A clamping assembly is disposed on the upper end face of the base plate and is used to clamp and fix the machined parts after positioning (single hole positioning and side orientation) is completed.

[0006] Furthermore, the positioning block includes positioning block I and positioning block II. The front end face shape of positioning block I and positioning block II fits the side contour of the processed part. Through the close contact between the front end face and the side of the processed part, the side orientation effect of the processed part is achieved, ensuring positioning stability. Positioning block I and positioning block II are installed by bolts inserted from the lower end face of the base plate. After the bolts pass through the preset mounting holes on the base plate, they form a threaded connection with the threaded holes opened on the bottom surface of positioning block I and positioning block II, fixing positioning block I and positioning block II to the upper end face of the base plate. This facilitates subsequent adjustment of the installation position of the positioning blocks or disassembly and maintenance according to the specifications of the processed part.

[0007] Furthermore, the positioning post is integrally formed with the base plate and is vertically fixedly connected to the upper surface of the base plate.

[0008] Furthermore, the clamping assembly includes a pressure plate and a shim block. The pressure plate has an overall "Z" shaped structure and comprises three sequentially connected parts: a bottom horizontal section, a middle vertical section, and a top horizontal section. The bottom horizontal section serves as the pressure plate and connects with the shim block to provide support for the pressure plate at a preset height. The top horizontal section extends towards the workpiece and above it, fixing the workpiece to the base plate from above. This, in conjunction with the positioning assembly, achieves stable clamping of the workpiece and prevents displacement during processing.

[0009] Furthermore, a connecting post is fixedly connected to the upper end face of the shim block. The connecting post can be inserted into the through hole in the horizontal section at the bottom of the pressure plate to achieve quick positioning of the pressure plate and the shim block, preventing the pressure plate from shifting during installation. The pressure plate is connected to the threaded hole on the upper end face of the shim block by a bolt passing through the preset mounting hole in the horizontal section at the bottom of the pressure plate. During the tightening of the bolt, the pressure plate can be firmly pressed onto the shim block, thereby ensuring the stable transmission of the clamping force of the pressure plate on the processed parts, ensuring the stability of the processed parts after clamping, and preventing deviations in processing accuracy due to loosening of the pressure plate during processing.

[0010] Furthermore, the clamping assembly also includes a side clamp, which is fixedly connected to the side of the base plate by bolts. The side clamp applies pressure towards the workpiece, pressing the workpiece inward to the front end face of the positioning block, so that the other side of the workpiece is tightly attached to the positioning block, further reducing the gap between the workpiece and the positioning block. Combined with the positioning function of the positioning assembly and the upper clamping function of the pressure plate, the workpiece is stably clamped in multiple directions, preventing lateral displacement of the workpiece during processing and ensuring processing accuracy.

[0011] Furthermore, the base plate is also provided with support columns I, II, and III, all of which are integrally formed with the base plate. The upper surfaces of support columns I, II, and III are smooth and flush, supporting the lower surface of the workpiece and providing stable bottom support for the workpiece. This prevents the workpiece from sinking or deforming due to its own weight or external processing forces. In conjunction with the positioning and clamping components, the positional stability and levelness of the workpiece after clamping are further ensured, guaranteeing the accuracy of subsequent processing.

[0012] Furthermore, the connecting plate has mounting holes for fixed connection with the indexing head via bolts.

[0013] Furthermore, the indexing head is equipped with a motor, which can drive the indexing head to rotate the fixture around the rotation axis.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, by setting a positioning post and a positioning block to cooperate, the positioning post is integrally formed with the base plate and the top diameter is adapted to the pre-machined through hole of the workpiece, which can realize single hole positioning. The front end face of the positioning block fits the side contour of the workpiece to realize side orientation. The two work together to determine the position of the workpiece, solve the problem of positioning difficulty caused by the structural characteristics of medical castings, and ensure the centering accuracy during clamping.

[0015] 2. This utility model uses a three-point support structure consisting of support column I, support column II, and support column III, combined with pressure plates for top and side clamping. The upper surfaces of the three support columns are flush and provide stable bottom support. The upper and side pressure plates apply balanced clamping forces from above and below and from the side, respectively, forming a multi-dimensional force balance. This reduces the squeezing deformation or stress deformation caused by uneven force during clamping of easily deformable workpieces such as medical castings, ensuring the morphological accuracy of the casting processing.

[0016] 3. This utility model, by setting a connecting plate to connect with the indexing head, allows the fixture to rotate from 0 to 360° with the indexing head. At the same time, combined with the multi-axis linkage of the machine tool and the tool-changing electric spindle, it can drive the workpiece to complete the switching of different machining surfaces, realize the one-time machining of multi-directional features of the workpiece, eliminate the need for multiple clamping, and greatly improve the machining efficiency and accuracy consistency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This utility model Figure 1 Another perspective on the 3D schematic diagram.

[0019] Figure 3 This is a three-dimensional schematic diagram of the machining fixture of this utility model without the part being installed.

[0020] Figure 4 This is a three-dimensional schematic diagram of the installation of the pressure block and the shim block of this utility model.

[0021] Figure 5 This is a three-dimensional schematic diagram of the connection between the pad and the base plate of this utility model.

[0022] Figure 6 This is a schematic diagram of the bottom of the part being processed according to this utility model.

[0023] Figure 7 This is a three-dimensional schematic diagram of the machining fixture installed on the indexing head in Embodiment 2 of this utility model.

[0024] Figure 8 This is a three-dimensional schematic diagram of the machining fixture and indexing head mounted on a CNC machine tool according to Embodiment 3 of this utility model.

[0025] Figure 9 This utility model Figure 8 Another perspective on the 3D schematic diagram.

[0026] In the diagram: 1-Connecting plate, 2-Base plate, 201-Support column I, 202-Support column II, 203-Support column III, 204-Positioning column, 3-Processed parts, 401-Side pressure I, 402-Side pressure II, 501-Positioning block I, 502-Positioning block II, 6-Pressure plate, 601-Elevating block, 602-Dialing column, 7-Indexing head, 8-Motor, 9-Machine tool, 10-Tool changer electric spindle. 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] In the description of this utility model, it should be noted that the terms "upper end," "lower end," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Example 1: Please see Figures 1 to 6 This utility model provides a technical solution: An automatic centering rotary machining fixture for medical castings is used to clamp and process guide housing castings of medical devices with motor-type structures or detection-type structures (such as all-white chemiluminescence immunoassay analyzers). It is supported by a connecting plate 1 and a base plate 2, and is equipped with positioning and clamping components to realize the positioning and clamping processing of guide housing medical castings.

[0031] The upper surface of the base plate 2 is integrated with positioning components and clamping components (such as...). Figure 1 As shown in the figure, they work together to ensure the positioning accuracy and clamping stability of the machined part 3.

[0032] The positioning assembly includes positioning blocks and positioning posts 204. The positioning blocks are specifically divided into positioning block I 501 and positioning block II 502. The shape of the front end face of both is adapted to the side contour of the processed part 3. The side orientation of the processed part 3 can be achieved by the close fit between the front end face and the side of the processed part 3. Both positioning block I 501 and positioning block II 502 are installed by inserting bolts from the lower end face of the base plate 2. After the bolts pass through the preset mounting holes on the base plate 2, they form a threaded connection with the threaded holes opened on the bottom surface of the positioning blocks. This not only firmly fixes the positioning blocks to the upper end face of the base plate 2, but also facilitates the adjustment of the installation position of the positioning blocks or disassembly and maintenance according to the needs of processing parts 3 of different specifications.

[0033] In this embodiment, the positioning post 204 and the base plate 2 are manufactured using an integral molding process (e.g., Figure 3 As shown), it is vertically connected to the upper surface of the base plate 2, in an inverted "T" shape. The diameter of the upper end sa of the positioning post 204 matches the diameter of the pre-machined through hole ss on the machined part 3 (as shown). Figures 2 to 4 As shown in the figure, single-hole positioning can be achieved by passing through the through hole. The side orientation of the positioning block cooperates with the single-hole positioning of the positioning post 204 to achieve the automatic centering effect of the processed part 3.

[0034] The base plate 2 is also provided with support columns I 201, II 202 and III 203, all of which are integrally formed with the base plate 2 (e.g., ...). Figure 3 As shown in the figure, it has high structural strength and no assembly gaps.

[0035] Among them, the upper surfaces of support column I 201, support column II 202 and support column III 203 are precision polished to maintain a smooth state and the upper surfaces of the three are on the same horizontal plane. They can jointly support the lower surface of the processed part 3, providing uniform and stable bottom support for the processed part 3, and preventing the processed part 3 from sinking or deforming due to its own weight or external forces during processing. At the same time, together with the positioning component and the clamping component, the positional stability and levelness of the processed part 3 after clamping are further ensured, providing a guarantee for subsequent high-precision processing.

[0036] It should be noted that the top heights of support columns I 201, II 202, and III 203 are consistent. Precision milling after integral molding ensures that the height error is controlled within a minimal range, guaranteeing stable support for the lower end face of the machined part 3. The overall height of positioning column 204 is higher than the top heights of support columns I 201, II 202, and III 203. This height difference allows positioning column 204 to be smoothly inserted into the pre-machined through hole on the machined part 3 when it is placed on the support columns, preventing insertion difficulties or positioning failure due to insufficient height of positioning column 204. Meanwhile, the diameter of the top of the positioning post 204 is strictly matched with the diameter of the pre-machined through hole of the workpiece 3, and the gap is controlled within the range of 0.02-0.05mm to ensure the accuracy of single-hole positioning. In addition, the front end faces of positioning blocks I 501 and II 502 that contact the workpiece 3 are also customized according to the side contour of the workpiece 3 to ensure complete fit with the side of the workpiece 3, further improving the stability of side orientation. Through the structural adaptation design of positioning post 204, support post and positioning block, the centering accuracy and positional stability of the workpiece 3 after clamping are jointly guaranteed.

[0037] The clamping assembly includes a pressure plate 6, a shim block 601, and a side clamp, which clamps the processed part 3 from the top and bottom and from the side in multiple dimensions: the pressure plate 6 has an overall "Z" shaped structure (e.g., Figure 4 As shown, it is composed of a bottom horizontal segment, a middle vertical segment, and a top horizontal segment connected in sequence.

[0038] In this embodiment, the shim block 601 is fixedly installed on the upper surface of the base plate 2, and a connecting post 602 is fixedly connected to its upper surface (e.g., Figure 4As shown), the docking post 602 can be inserted into the pre-set through hole in the bottom horizontal section of the pressure plate 6, realizing the quick positioning of the pressure plate 6 and the shim block 601, and avoiding the offset of the pressure plate 6 during installation; during installation, the bolt passes through the pre-set mounting hole in the bottom horizontal section of the pressure plate 6 and forms a threaded connection with the threaded hole on the upper end face of the shim block 601. After tightening the bolt, the pressure plate 6 can be firmly pressed onto the shim block 601, so that the middle vertical section of the pressure plate 6 provides a pre-set height support, and the top horizontal section extends towards the processing part 3 to the top of the processing part 3, forming a clamping force on the processing part 3 from above, and pressing the processing part... Fixed to the base plate 2, the three-point evenly distributed support structure forms a stable three-point support from the lower end face of the workpiece 3, ensuring balanced force on the bottom of the workpiece 3 and avoiding localized force concentration caused by single or two-point support. Combined with the pre-clamping force applied from above by the pressure plate 6, it forms a corresponding and balanced clamping force with the bottom three-point support, effectively reducing the squeezing deformation or stress deformation caused by uneven force during clamping of easily deformable workpieces such as medical castings. This ensures the initial shape accuracy of the casting before processing, and is especially suitable for applications where medical castings have stringent processing accuracy requirements. A flexible pad such as rubber or silicone can be attached / adheded to the surface of the top horizontal section of the pressure plate 6 that contacts the top of the workpiece 3 to protect the top of the workpiece 3 during downward pressure.

[0039] The side pressure includes side pressure I 401 and side pressure II 402 (e.g. Figure 1 As shown, it is fixed to the side of the base plate 2 by bolts. The side facing the workpiece 3 can apply lateral pressure to press the workpiece 3 inward to the front end face of the positioning block, further eliminating the gap between the workpiece 3 and the positioning block. With the upper pressing action of the pressure plate 6, the workpiece 3 is clamped in multiple directions to prevent the workpiece from shifting or loosening during the processing.

[0040] In this embodiment, the side pressure unit has a "factory" shaped structure, which includes mutually perpendicular vertical sections and horizontal sections (such as...). Figure 3As shown in the figure, the vertical section is fitted to the side of the base plate 2, and a connecting hole is opened on the vertical section to match the mounting hole on the side of the base plate 2. The bolt passes through the connecting hole and is threaded to the side of the base plate 2, thereby firmly fixing the side-pressed vertical section to the side of the base plate 2. The horizontal section extends horizontally inward from the top of the vertical section toward the processing part 3, and the extension length is just enough to cover the side of the processing part 3, so that the inner end face of the horizontal section can be in close contact with the side of the processing part 3. During assembly, tightening the bolts on the vertical side-pressure section applies lateral pressure to the horizontal section towards the workpiece 3, firmly holding and pressing the workpiece 3 against the front end face of the positioning block. After the lateral pressure assembly is in place, its lateral clamping force works synergistically with the single-hole positioning of the positioning column 204 and the side orientation of the positioning block. This synergistic effect restricts the displacement of the workpiece 3 from both the lateral and positioning directions, and eliminates clamping misalignment (such as the fit gap between the workpiece 3 and the front end faces of positioning blocks I and II, and the support gap between the lower end face of the workpiece 3 and the upper end faces of support columns I, II, and III). This ensures the assembly position of the workpiece 3 on the fixture and avoids affecting the subsequent machining accuracy due to assembly deviations.

[0041] Example 2: Please see Figure 7 This utility model provides a technical solution that is basically the same as that in Embodiment 1, with slight differences: In Example 1, the base plate 2 and the connecting plate 1 of the fixture are fixedly assembled by bolt connection. Specifically, matching bolt holes are pre-set on the mating surfaces of the base plate 2 and the connecting plate 1. Bolts are passed through the bolt holes and tightened to make the base plate 2 firmly connected to the side of the connecting plate 1, forming the support frame of the fixture body. This connection method is not only convenient to assemble, but also ensures the connection strength between the base plate 2 and the connecting plate 1, avoiding relative displacement during subsequent rotation processing.

[0042] Meanwhile, the connecting plate 1 has several mounting holes. The diameter, number, and distribution of these mounting holes match the mounting hole parameters of the indexing head 7's turntable d. During assembly, bolts are sequentially inserted through the mounting holes of the connecting plate 1 and the indexing head 7's turntable d. After tightening the bolts, the connecting plate 1 and the indexing head 7's turntable d are fixedly connected, thus stably mounting the entire fixture on the indexing head 7. This structural design utilizes the rotation function of the indexing head 7 to lay the foundation for the subsequent synchronous rotation of the fixture and the clamped machining parts 3, meeting the multi-directional machining needs of medical castings. Furthermore, the detachable connection between the connecting plate 1 and the indexing head 7 facilitates the replacement of fixtures of different specifications or the maintenance of the indexing head 7 according to machining requirements.

[0043] The power input terminal of the indexing head 7 is connected to a motor 8 (e.g., ...). Figure 7 As shown), the motor 8 can drive the indexing head 7 to rotate the fixture around the rotating axis from 0 to 360°, thereby realizing the multi-angle switching of the casting processing surface in the work station slot.

[0044] The indexing head 7 is preferably a high-precision indexing head 7 from the YUKIWA brand. It has a high-rigidity transmission structure and a precision indexing and positioning function, which can ensure the accurate positioning of the fixture during the angle rotation process and meet the angle tolerance requirements of multi-face machining of the workpiece 3. The matching motor 8 is a stepper motor. The motor 8 can be angle controlled by pulse signals. It works with the tool-changing electric spindle 10 of the machine tool 9 to complete continuous cutting of different machining surfaces, effectively improving machining efficiency and accuracy consistency.

[0045] Example 3: Please see Figures 8 to 9 This utility model provides a technical solution that is basically the same as that in Embodiment 2, with slight differences: The machine tool 9 is equipped with a tool-changing electric spindle 10 in the machining area corresponding to the fixture. The tool-changing electric spindle 10 can automatically switch tools according to the machining requirements and perform multiple processes such as cutting and drilling on different machining surfaces of the workpiece 3 in coordination with the angle rotation of the fixture, which greatly improves the machining efficiency and accuracy.

[0046] The machine tool 9 is preferably a four-axis machine tool, which has three linear motion directions (x, y, z) and one rotary motion, and can realize complex trajectory machining through multi-axis linkage control. The rotary axis of the four-axis machine tool works in conjunction with the indexing head 7 drive system, and can simultaneously control the machining position of the tool-changing electric spindle 10 through the feed motion in the x, y, and z axes when the fixture drives the workpiece 3 to complete the angular rotation, ensuring that stable feed accuracy and cutting parameters can be maintained for cutting, drilling and other processes on different surfaces of the workpiece 3.

[0047] The following is a detailed introduction: The indexing head 7 and fixture are integrally mounted on the machine tool 9, which has a U-shaped frame. The motor 8 is mounted on the indexing head 7, which is mounted on the base s. C-shaped support frames e are mounted on the front and rear sides of the base s, each equipped with support feet u to facilitate placement of the base s on the ground or other mounting locations. A bottom guide post a is installed between the two C-shaped support frames e, and guide sleeves g are installed on both sides of the bottom of the machine tool 9 for the bottom guide post a to slide through. A lead screw f is installed through the center of the bottom of the machine tool 9, with both ends of the lead screw f fitted onto bearings q located on the front and rear C-shaped support frames e. A drive motor w for driving the lead screw f is mounted on the front C-shaped support frame e. Both ends of the guide post a are fitted into bushings i located on the C-shaped support frame e.

[0048] By driving the lead screw f to rotate via the drive motor w, the machine tool 9 and the components mounted on it can move back and forth relative to the base s (i.e. along the x-axis direction) when the bottom guide post a and the guide sleeve g are engaged.

[0049] A U-shaped support r has a lead screw b that passes through and is threaded to the support r. Both ends of the lead screw b are fitted onto bearings q located on machine tool 9. A drive motor n for rotating the lead screw b is mounted on the left side outside machine tool 9. A guide rod / column v is fitted onto the support r, with both ends fitted into bushings i located on machine tool 9. A drive motor m is mounted on the top of the support r, and a sub-support p is located inside the support r. A lead screw c passes through the sub-support p and is threaded to the sub-support p. Both ends of the lead screw c are fitted onto bearings q located on the support r, and the drive motor m is used to drive the lead screw c to rotate. A guide rod k is fitted onto the sub-support p, with both ends fitted into bushings i located on the support r.

[0050] By driving the lead screw b to rotate via the drive motor n, and with the support r and guide rod v engaged, the support r can move back and forth within the machine tool 9 (i.e., along the y-axis). Furthermore, by driving the lead screw c to rotate via the drive motor m, and with the sub-support p and guide rod k engaged, the sub-support p can move up and down within the support r (i.e., along the z-axis).

[0051] It should be noted that in this embodiment, the bottom of the machine tool 9 has a gap from the ground to facilitate forward and backward movement. The bottom guide post a and the lead screw f are located in the same horizontal plane, the guide rod k and the lead screw c are located in the same vertical plane, and the guide rod v and the lead screw b are located in the same vertical plane. The number of bottom guide posts a, guide rod k, and guide rod v are all symmetrically two.

[0052] The indexing head 7 has a rotating shaft equipped with a turntable d, which is used to mount and fix the connecting plate 1. By rotating the turntable d of the indexing head 7, the connecting plate 1 and its mounted components are rotated to facilitate the processing of the workpiece 3.

[0053] In this embodiment, by cooperating with the drive motor w and the lead screw f, the positions of the machine tool 9 and the base s can be changed, thereby enabling the electric spindle and the fixture to change and adjust their positions forward and backward; by cooperating with the drive motor n and the lead screw b, the positions of the support r and the base s can be changed, thereby enabling the electric spindle and the fixture to change and adjust their positions left and right; by cooperating with the drive motor m and the lead screw c, the positions of the sub-support p and the base s can be changed, thereby enabling the electric spindle and the fixture to change and adjust their positions up and down.

[0054] The changes and adjustments to the front-back position, the left-right position, and the up-down position are the three linear motion directions mentioned above (x, y, z); the rotation of the electric spindle along the z-axis is the one rotational motion mentioned above.

[0055] Machine tool 9 has a control system such as a PLC control system to enable logical control of various electrical control devices such as drive motors n, g, m and motor 8. This is an existing mature control method or technology, which will not be described in detail here.

[0056] The parts of this utility model not described are existing technology, or may be the same as existing technology, or may be known technology, or may be implemented using existing technology, and will not be described in detail here.

[0057] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic centering rotary machining fixture for medical casting products, characterized in that, include: The base plate (2) is fixedly connected to the side of the connecting plate (1), and a positioning component is fixedly connected to the upper end face of the base plate (2) for positioning the processed part (3); The positioning component includes a positioning block and a positioning post (204), wherein the positioning block is used to abut against the side of the processed part (3), and the positioning post (204) is used to pass through the pre-machined through hole on the processed part (3). Through the cooperation of the positioning block and the positioning post (204), the single hole positioning and side orientation of the processed part (3) are realized. A clamping assembly is provided on the upper surface of the base plate (2) and is used to clamp and fix the machined part (3) after it has been positioned.

2. The automatic centering rotary machining fixture for medical castings as described in claim 1, characterized in that, The positioning block includes positioning block I (501) and positioning block II (502). The front end face shape of positioning block I (501) and positioning block II (502) fits the side contour of the processed part (3). Positioning block I (501) and positioning block II (502) are installed by inserting bolts through the lower end face of the base plate (2). After the bolts pass through the preset mounting holes on the base plate (2), they form a threaded connection with the threaded holes opened on the bottom surface of positioning block I (501) and positioning block II (502), fixing positioning block I (501) and positioning block II (502) to the upper end face of the base plate (2).

3. The automatic centering rotary machining fixture for medical castings as described in claim 1, characterized in that, The positioning column (204) is integrally formed with the base plate (2) and is vertically fixedly connected to the upper end face of the base plate (2).

4. The automatic centering rotary machining fixture for medical casting products as described in claim 1, characterized in that, The clamping assembly includes a pressure plate (6) and a shim block (601). The pressure plate (6) has a "Z" shaped structure and includes three sequentially connected parts: a bottom horizontal section, a middle vertical section, and a top horizontal section. The bottom horizontal section is connected to the shim block (601) as the pressure plate (6), and the top horizontal section extends towards the processing part (3) and above it.

5. The automatic centering rotary machining fixture for medical castings as described in claim 4, characterized in that, The upper end face of the shim block (601) is fixedly connected to a docking post (602). The docking post (602) can be inserted into the through hole of the bottom transverse section of the pressure plate (6). The pressure plate (6) is threadedly connected to the threaded hole on the upper end face of the shim block (601) by bolts passing through the preset mounting hole on the bottom transverse section of the pressure plate (6).

6. The automatic centering rotary machining fixture for medical casting products as described in claim 4, characterized in that, The clamping assembly also includes a side pressure, which is fixedly connected to the side of the base plate (2) by bolts. The side pressure applies pressure in the direction of the processed part (3) and presses the processed part (3) inward to the front end face of the positioning block.

7. The automatic centering rotary machining fixture for medical castings as described in claim 1, characterized in that, The base plate (2) is also provided with support columns I (201), II (202) and III (203). The support columns are integrally formed with the base plate (2). The upper surfaces of support columns I (201), II (202) and III (203) are smooth and flush, supporting the lower surface of the processed parts (3).

8. The automatic centering rotary machining fixture for medical casting products as described in claim 1, characterized in that, The connecting plate (1) has mounting holes and is fixedly connected to the indexing head (7) by bolts.

9. The automatic centering rotary machining fixture for medical castings as described in claim 8, characterized in that, The indexing head (7) is equipped with a motor (8), which can drive the indexing head (7) to rotate the fixture around the rotation axis.

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