A fixture for processing a special-shaped casting

Abstract

The utility model relates to foundry fixture technical field especially is a kind of clamp for special-shaped casting processing, including work position groove, briquetting and limit block, positioning pin is inserted into the preset positioning hole in clamp after passing through the through slot of briquetting upper opening, the lower end of briquetting is pressed with the displacement of briquetting and correspondingly and presses the process boss of casting edge, for fixing casting in work position groove, limit groove is opened in limit block, the shape of limit groove is compatible with the process boss outer shape profile of casting.The utility model, by positioning pin and briquetting, casting is positioned on clamp plane, effectively limit the freedom of workpiece activity, and by setting the limit block with limit groove, and the shape and angle of limit groove and the process boss of casting right side are completely adapted, the rapid initial positioning of casting is realized, without manual repeated calibration;While only right side is provided with adaptive limit groove, casting reverse installation can be effectively prevented, and processing error or equipment damage caused by reverse installation is avoided.

Description

Technical Field

[0001] This utility model relates to the field of casting fixture technology, specifically a fixture for machining irregularly shaped castings. Background Technology

[0002] Irregularly shaped castings refer to metal parts with irregular shapes and non-standard geometric shapes produced by casting processes (such as die casting and sand casting). Their structures are usually designed according to specific functional requirements and may include features such as complex curved surfaces, asymmetrical contours, irregular holes, or bosses. In the field of cameras, they can be used as camera housings, lens module brackets, etc. With their customized contour design, irregularly shaped castings can accurately adapt to the installation requirements of internal optical components (such as lenses, sensors, and circuit boards) of cameras, providing stable support for precision components, while also playing a role in dustproofing and impact protection.

[0003] Current fixtures for machining irregularly shaped castings require manual alignment of multiple positioning points between the casting and the fixture during installation. The casting position must be repeatedly adjusted to match the fixture slot shape, and the correspondence between each process boss and pressure block must be calibrated individually, which is time-consuming. Furthermore, because there is no dedicated anti-reverse installation structure, if the casting is misaligned (left-right or right-side up), relying solely on visual inspection is prone to error, resulting in the pressure blocks failing to accurately clamp the bosses after reverse installation, causing the casting to loosen and shift during machining. Moreover, when machining multiple surfaces of the casting, traditional fixtures cannot adapt to multi-angle machining requirements. The casting must be disassembled from the current fixture and reassembled onto other dedicated fixtures. Multiple clamping not only increases machining time and reduces efficiency but also generates cumulative errors due to repeated positioning, making it difficult to guarantee the positional accuracy of each machined surface and severely affecting the consistency of overall product dimensional and geometric tolerances. Utility Model Content

[0004] The purpose of this utility model is to provide a fixture for machining irregularly shaped castings, 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:

[0006] A fixture for machining irregularly shaped castings includes:

[0007] The work station slot includes a first work station slot and a second work station slot, which are formed on the fixture and are used to place the irregularly shaped castings to be processed.

[0008] The positioning pin passes through the slot opened on the pressure block and is inserted into the preset positioning hole on the fixture.

[0009] The pressure block has its mating end inserted into the mating groove on the fixture as the positioning pin is pressed down. The mating groove and the positioning pin form a two-point fixing structure for the pressure block, ensuring that the pressure block is installed in a precise position. The pressing end of the pressure block moves down and corresponds to and presses against the process boss on the edge of the casting, which is used to fix the casting in the work station groove.

[0010] Furthermore, a limiting groove is provided on the limiting block. The shape of the limiting groove is adapted to the outline of the process boss of the casting. It is used to engage the process boss when the casting is placed in the work station groove. The position of the casting in the work station groove is determined by the fit between the limiting groove and the process boss.

[0011] Furthermore, the limiting block is provided with a fixing hole for detachably fixing the limiting block to the upper surface of the fixture by passing a fastener through the fixing hole. The limiting block is fixed in the right side area of ​​the work station slot, and one limiting block is respectively provided on the right side of the first work station slot and the second work station slot.

[0012] Furthermore, the rear end of the pressure block is a mating end, the bottom width of which is adapted to the width of the mating groove on the fixture, and the front end of the pressure block is a pressing end, the bottom of which is smoothly set, and the length of the pressing end is shorter than the length of the mating end.

[0013] Furthermore, a clearance space is provided above the lower pressing end of the pressure block.

[0014] Furthermore, the first and second work station slots have corresponding number of positioning holes and mating slots on both sides. The positioning holes and mating slots are distributed along the edge of the work station slots. The process boss is integrally formed and connected to the edge of the casting. The number of process bosses corresponds to the number of positioning holes and mating slots on both sides of each work station slot, so that each process boss can be fixed by the corresponding pressure block and positioning pin.

[0015] Furthermore, a mounting plate is fixedly connected to the rear end face of the fixture, and multiple mounting holes are provided on both sides of the connection between the mounting plate and the fixture, for the fixture to be detachably installed on the indexing head by fasteners passing through the mounting holes.

[0016] Furthermore, the indexing head is connected to a motor, which can drive the indexing head to rotate the fixture around the rotation axis, thereby realizing the angle adjustment of the casting in the work station slot on the fixture during the processing.

[0017] Furthermore, the indexing head and fixture are mounted on the machine tool as a whole, and the machine tool is equipped with a tool-changing electric spindle at the machining position of the fixture. The tool-changing electric spindle can rotate in coordination with the angle of the fixture to perform cutting machining on different machining surfaces of the casting.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This invention uses locating pins to position the casting on the fixture plane, effectively limiting the workpiece's freedom of movement, ensuring positional tolerances, and making the casting quality more stable. Furthermore, by setting a limiting block with a limiting groove, and ensuring the groove's shape and angle perfectly match the right-side process boss of the casting, rapid initial positioning of the casting is achieved without repeated manual calibration. Simultaneously, the matching limiting groove is only set on the right side, effectively preventing reverse installation of the casting and avoiding processing errors or equipment damage caused by reverse installation.

[0020] This invention utilizes a fixture that automatically rotates the machine tool's indexing head to allow different machining surfaces of a part to be machined in a single setup. When machining multiple surfaces, there is no need to disassemble and reassemble, directly reducing at least one repetitive clamping process, minimizing errors that may result from repeated clamping, and improving machining efficiency.

[0021] This invention achieves multi-point targeted fixing of the casting by setting corresponding positioning holes and mating grooves on both sides of the work station groove, which correspond one-to-one with the process bosses integrally formed on the edge of the casting. This avoids displacement caused by uneven force distribution during single-point fixing and improves fixing stability. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model.

[0023] Figure 2 for Figure 1 Another perspective on the 3D schematic diagram.

[0024] Figure 3 This is a three-dimensional schematic diagram of the process boss, limiting block, and pressure block of the casting of this utility model.

[0025] Figure 4 This is a three-dimensional schematic diagram of the casting of this utility model in conjunction with the first and second station slots.

[0026] Figure 5 This is a three-dimensional schematic diagram of the casting of this utility model.

[0027] Figure 6 This is a schematic diagram showing the connection between the clamp and the indexing plate of this utility model.

[0028] Figure 7 This is a schematic diagram of the indexing plate driving the clamp to rotate 90° according to the present invention.

[0029] Figure 8 This is a schematic diagram of the fixture and indexing plate of this utility model installed on a machine tool.

[0030] Figure 9 This utility model Figure 8 Another perspective illustration.

[0031] In the diagram: 1- Fixture, 101-Mating groove, 102-First station groove, 103-Second station groove, 104-Positioning hole, 2-Mounting plate, 201-Mounting hole, 3-Casting, 301-Process boss, 4-Pressure block, 401-Through groove, 402-Mating end, 403-Pressing end, 404-Clearing space, 5-Positioning pin, 6-Limiting block, 601-Fixing hole, 602-Limiting groove, 7-Indexing head, 8-Motor, 9-Machine tool, 10-Tool changer electric spindle. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Example 1:

[0036] Please see Figures 1 to 5 This utility model provides a technical solution:

[0037] A fixture for machining irregularly shaped castings, specifically for machining irregularly shaped castings used in cameras, comprising:

[0038] The fixture 1 has a work station groove, which includes a first work station groove 102 and a second work station groove 103. The groove structure is adapted to the outer contour of the irregular casting 3 to be processed, and is used to provide a limited placement area for the casting 3.

[0039] like Figure 4 To fix the casting 3, the first work station groove 102 and the second work station groove 103 have the same number of positioning holes 104 and mating grooves 101 distributed along the edges on both sides. The positioning holes 104 and mating grooves 101 correspond one-to-one and are set together to adapt and install the positioning pins 5 and the pressure blocks 4, respectively, to ensure the precise fit of each fixed point.

[0040] like Figure 3 The positioning pin 5 is a cylindrical structure, and its outer diameter is adapted to the diameter of the positioning hole 104. When in use, it passes through the through groove 401 opened on the pressure block 4 and is inserted into the positioning hole 104 preset in the fixture 1. Through the cooperation of the positioning pin 5 with the through groove 401 and the positioning hole 104, the pressure block 4 is provided with installation guidance and vertical positioning reference.

[0041] The pressure block 4 is an integrally formed structure with its rear end as a mating end 402 and its front end as a pressing end 403. The bottom width of the mating end 402 is precisely matched with the width of the mating groove 101 opened on the fixture 1. As the positioning pin 5 is pressed down, it can be inserted into the mating groove 101. The mating groove 101 and the positioning pin 5 form a two-point fixing structure for the pressure block 4, ensuring that the installation position of the pressure block 4 is not offset.

[0042] In this embodiment, the positioning pin 5 and the positioning hole 104 preferably adopt an interference fit, which can ensure that the positioning pin 5 is not easy to loosen after being inserted into the positioning hole 104. Furthermore, after the fixture 1 is flipped, it can provide stable support for the two-point fixing structure of the pressure block 4. In this way, the continuous pressing action of the pressure block 4 on the process boss 301 ensures the stability of the casting 3 in the work station slot and effectively prevents the casting 3 from falling off due to the force of flipping. At the same time, the interference fit ensures that the operator can easily disassemble and install the positioning pin 5 with conventional tools, thus taking into account both structural stability and ease of operation.

[0043] Specifically, the bottom of the lower pressure end 403 is set with a smooth arc surface, which can move down with the pressure block 4 to accurately fit and press the process boss 301 of the casting 3, so as to avoid damaging the surface of the casting 3.

[0044] Specifically, the length of the pressing end 403 is shorter than the length of the mating end 402, reducing contact interference with the non-machined area of ​​the casting 3. Simultaneously, the mating end 402 engages with the mating groove 101 of the fixture 1 to form a limit. After the positioning pin 5 is inserted into the positioning hole 104, the width of its pin head is greater than the width of the pin body, and the width of the pin body matches the width of the through groove 401 on the pressure block 4, allowing the pin body to smoothly pass through the through groove 401 and precisely engage with the positioning hole 104. When the positioning pin 5 is fully inserted into the positioning hole 104, the lower end face of the pin head tightly adheres to the upper surface of the pressure block 4 and applies downward pressure. The locking effect of the mating groove 101 on the mating end 402 forms a double constraint, ensuring that the pressing end 403 of the pressure block 4 always maintains a preset angle facing the process boss 301 of the casting 3, ensuring that the pressing end 403 is precisely aligned and presses against the process boss 301. The entire assembly process achieves automatic calibration through the structure's own adaptation relationship, eliminating the need for manual adjustment of the pressure block 4's direction, thus improving stability and efficiency.

[0045] Specifically, an clearance position 404 is provided above the lower pressing end 403 of the pressure block 4, which is used to process the outline area of ​​the casting 3 that is covered by the body of the pressure block 4 when the casting 3 is processed on the front side after the fixture 1 is rotated 180° to process the reverse side of the casting 3.

[0046] The fixture 1 is provided with a limiting block 6 on the right side of each work station slot. The limiting block 6 has a limiting groove 602 that is perfectly matched with the outline of the process boss 301 on the right side of the casting 3. When the casting 3 is placed in the work station slot, the process boss 301 can be inserted into the limiting groove 602. The initial position of the casting 3 in the work station slot is determined in advance by the fit between the two, which provides a basis for the fastening of the pressure block 4 and the positioning pin 5.

[0047] The limiting block 6 is detachably fixed to the upper surface of the fixture 1 by fasteners. A fixing hole 601 is provided on its body. After the fastener passes through the fixing hole 601, the limiting block 6 is locked. The limiting block 6 is fixed to the right side of the work station slot. One limiting block 6 is independently provided on the right side of the first work station slot 102 and the second work station slot 103 respectively.

[0048] In this embodiment, the limiting block 6 has a limiting groove 602 that perfectly matches the outline of the process boss 301 on the right side of the casting 3. The shape and angle of the limiting block 6 are consistent with those of the rightmost process boss 301 of the casting 3, ensuring that the two fit together without gaps. By setting only one limiting block 6 with a fixed shape and angle on the right side of each work station slot, when the right process boss 301 of the casting 3 is inserted into the limiting groove 602, the casting 3 can automatically complete the position calibration through the angle and shape constraints of the limiting groove 602, so that the positioning is immediately determined. At the same time, the precise fit of the limiting groove 602 can drive the overall alignment of the casting 3, ensuring that each process boss 301 of the casting 3 falls accurately into the area below the corresponding pressure block 4. With the subsequent fastening action of the positioning pin 5 and the pressure block 4, the casting 3 can be quickly installed, greatly improving the clamping efficiency.

[0049] Since the limiting groove 602 with a fixed shape and angle is only set on the right side of the work station slot, and the limiting groove 602 is only compatible with the process boss 301 on the right side of the casting 3, when the casting 3 is reversed (i.e. the left side of the casting 3 is placed to the right or the front and back are reversed), the shape and angle of the process boss 301 on the left side of the casting 3 cannot match the limiting groove 602, so that the process boss 301 cannot be locked into the limiting groove 602, thereby effectively preventing the casting 3 from being reversed and avoiding processing errors or equipment damage caused by reversed installation.

[0050] like Figure 5 The edge of the casting 3 is integrally formed with process bosses 301. The number of process bosses 301 corresponds one-to-one with the number of positioning holes 104 and mating grooves 101 on both sides of each work station groove, so that each process boss 301 can be fixed in a targeted manner by the corresponding pressure block 4 and positioning pin 5, avoiding displacement of the casting 3 due to uneven force on a single point of fixation.

[0051] When assembling the casting 3 to be processed in the fixture 1, the casting 3 is placed into the first work station slot 102 or the second work station slot 103 of the fixture 1, so that the process boss 301 on the right side of the casting 3 is aligned with the limiting groove 602 of the limiting block 6 on the right side of the work station slot, and slowly pushed in until the process boss 301 is completely engaged in the limiting groove 602. Through the matching of the shape and angle of the limiting groove 602 and the process boss 301, the initial position of the casting 3 is automatically calibrated. Then, the pressure block 4 is removed, and the through groove 401 on the pressure block 4 is aligned with the positioning pin 5. The pin body of the positioning pin 5 is passed through the through groove 401, and at the same time, the mating end 402 at the rear end of the pressure block 4 is aligned with the mating groove 101 on the edge of the corresponding work station slot on the fixture 1. The positioning pin 5 is pressed down so that its lower end is inserted into the preset positioning hole 10 of the fixture 1. Within 4, initial fixation is achieved through the interference fit between the positioning pin 5 and the positioning hole 104. During this process, the mating end 402 of the pressure block 4 is simultaneously inserted into the mating groove 101 as the positioning pin 5 is pressed down. The lower end face of the pin head at the end of the positioning pin 5 is attached to the upper surface of the pressure block 4 and applies downward pressure. The lateral locking of the mating end 402 by the mating groove 101 and the longitudinal pressure of the pin head form a double constraint, so that the pressing end 403 at the front end of the pressure block 4 accurately presses the process boss 301 corresponding to the casting 3. Observe whether the casting 3 is firmly attached to the bottom of the work station groove and whether each process boss 301 is within the pressing range of the corresponding pressure block 4. After confirming that there is no loosening or displacement, the assembly of a single casting 3 is completed. Repeating the above steps can complete the assembly of the casting 3 in another work station groove, preparing for subsequent processing.

[0052] Example 2:

[0053] This utility model provides a technical solution that is basically the same as that in Embodiment 1, with the following slight differences:

[0054] In this embodiment, the positioning pin 5 and the positioning hole 104 can also be fitted with threaded assembly.

[0055] The outer surface of the positioning pin 5 is provided with external threads, and the inner wall of the positioning hole 104 is provided with corresponding internal threads. During assembly, the positioning pin 5 is connected and fixed by engaging with the threads of the positioning hole 104. Compared with the interference fit of Embodiment 1, the threaded assembly requires the positioning pin 5 to be rotated for tightening during installation, which is slightly slower. However, the helical pair connection formed by the thread engagement has higher stability. In scenarios with continuous cutting forces, such as milling, the self-locking characteristic of the thread can provide a lasting and stable downward pressure to the pressure block 4, effectively preventing the casting 3 from falling off or undergoing slight displacement due to processing vibration. Furthermore, shims can be added to prevent loosening, further ensuring the positional accuracy of the casting 3 during processing and ensuring that the dimensional and geometric tolerances of the milling process meet the design requirements.

[0056] Example 3:

[0057] Please see Figures 6 to 7This utility model provides a technical solution that is basically the same as that in Embodiment 1, with slight differences:

[0058] like Figure 6 The rear end face of the clamp 1 is fixedly connected to the mounting plate 2 by bolts. Multiple mounting holes 201 are symmetrically opened on both sides of the connection between the mounting plate 2 and the clamp 1. The clamp 1 is detachably installed on the indexing head 7 by fasteners passing through the mounting holes 201, so as to realize the stable connection between the clamp 1 and the drive component.

[0059] like Figure 7 The indexing head 7 is connected to a motor 8 at its power input end. The motor 8 can drive the indexing head 7 to rotate the fixture 1 around the rotation axis from 0 to 360 degrees, thereby realizing multi-angle switching of the machining surface of the casting 3 in the work station slot.

[0060] The indexing head 7 is preferably a high-precision indexing head from the YUKIWA brand, which has a high-rigidity transmission structure and precise indexing and positioning function, ensuring accurate positioning of the fixture 1 during angular rotation and meeting the angular tolerance requirements for multi-face machining of the irregularly shaped casting 3. The matching motor 8 is a stepper motor, which can achieve precise angle control through 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 the machining efficiency and accuracy consistency of the complex irregularly shaped casting 3.

[0061] Example 4:

[0062] Please see Figure 8 and Figure 9 This utility model provides a technical solution that is basically the same as that in Embodiment 2, with slight differences:

[0063] The machine tool 9 is equipped with a tool-changing electric spindle 10 in the machining area corresponding to the fixture 1. 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 casting 3 in conjunction with the angle rotation of the fixture 1, which greatly improves machining efficiency and accuracy.

[0064] The machine tool 9 is preferably a 4-axis machine tool 9, 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 4-axis machine tool 9 and the indexing head 7 drive system work in precise coordination, so that when the fixture 1 drives the casting 3 to complete the angular rotation, the machining position of the tool changing electric spindle 10 can be controlled simultaneously through the feed motion in the x, y, and z axes, ensuring that stable feed accuracy and cutting parameters can be maintained for cutting, drilling and other processes on different surfaces of the casting 3.

[0065] The following is a detailed introduction:

[0066] The indexing head 7 and fixture 1 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 installation 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 g 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.

[0067] By driving the lead screw f to rotate via the drive motor g, the machine tool 9 and the components mounted on it can move back and forth (i.e. along the x-axis) relative to the base s when the bottom guide post a and the guide sleeve g are engaged.

[0068] 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.

[0069] 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).

[0070] 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.

[0071] The indexing head 7 has a rotating shaft equipped with a turntable d, which is used to mount and fix the mounting plate 2. By rotating the turntable d of the indexing head 7, the mounting plate 2 and the components it mounts are rotated to facilitate the machining of the casting 3.

[0072] In this embodiment, by cooperating with the drive motor g and the lead screw f, the positions of the machine tool 9 and the base s can be changed, thereby enabling the electric spindle 10 and the fixture 1 to change and adjust their front-to-back positions; 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 10 and the fixture 1 to change and adjust their left-to-right positions; 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 10 and the fixture 1 to change and adjust their up-down positions.

[0073] 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 10 along the z-axis is the aforementioned rotational motion.

[0074] 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.

[0075] In summary: When using this utility model, the casting 3 to be processed is first fixed in the work station slot of the fixture 1. The initial positioning of the casting 3 is completed by the limiting block 6. Then, the positioning pin 5 and the pressure block 4 work together to achieve a stable clamping of the casting 3, ensuring that there is no loosening or displacement. Subsequently, the fixture 1 with the casting 3 assembled is fixed to the indexing head 7 through the mounting hole 201 of the rear mounting plate 2 and the fastener, so that the fixture 1 and the indexing head 7 drive system form a stable connection, and processing can then be carried out.

[0076] The parts of this utility model not described are existing technologies.

[0077] 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. A fixture for machining irregularly shaped castings, characterized in that, include: The work station slot includes a first work station slot (102) and a second work station slot (103). The work station slot is opened on the fixture (1) and is used to place the irregular casting (3) to be processed. Positioning pin (5), after passing through the through groove (401) opened on the pressure block (4), is inserted into the positioning hole (104) preset on the fixture (1); The pressure block (4) has its mating end (402) inserted into the mating groove (101) on the fixture (1) as the positioning pin (5) is pressed down. The mating groove (101) and the positioning pin (5) form a two-point fixing structure for the pressure block (4), thereby determining the installation position of the pressure block (4). The pressing end (403) of the pressure block (4) corresponds to and presses the process boss (301) on the edge of the casting (3) as the pressure block (4) moves down, which is used to fix the casting (3) in the work station groove. A limiting block (6) is provided with a limiting groove (602). The shape of the limiting groove (602) is adapted to the outline of the process boss (301) of the casting (3). It is used to engage the process boss (301) when the casting (3) is placed in the work station slot. The position of the casting (3) in the work station slot is determined by the fit between the limiting groove (602) and the process boss (301).

2. A fixture for machining irregularly shaped castings according to claim 1, characterized in that: The limiting block (6) has a fixing hole (601) for detachably fixing the limiting block (6) to the upper surface of the fixture (1) by fasteners passing through the fixing hole (601). The limiting block (6) is fixed in the right side area of ​​the work station slot, and one limiting block (6) is respectively provided on the right side of the first work station slot (102) and the second work station slot (103).

3. A fixture for machining irregularly shaped castings according to claim 1, characterized in that: The rear end of the pressure block (4) is a mating end (402), the bottom width of the mating end (402) is adapted to the width of the mating groove (101) on the fixture (1), the front end of the pressure block (4) is a pressing end (403), the bottom of the pressing end (403) is smoothly set, and the length of the pressing end (403) is shorter than the length of the mating end (402).

4. A fixture for machining irregularly shaped castings according to claim 3, characterized in that: An clearance space (404) is provided above the lower pressing end (403) of the pressure block (4).

5. A fixture for machining irregularly shaped castings according to claim 1, characterized in that: The first work station slot (102) and the second work station slot (103) are provided with a corresponding number of positioning holes (104) and mating slots (101) on both sides. The positioning holes (104) and mating slots (101) are distributed along the edge of the work station slot. The process boss (301) is integrally formed and connected to the edge of the casting (3). The number of process bosses (301) corresponds to the number of positioning holes (104) and mating slots (101) on both sides of each work station slot, so that each process boss (301) can be fixed by the corresponding pressure block (4) and positioning pin (5).

6. A fixture for machining irregularly shaped castings according to claim 1, characterized in that: The rear end face of the fixture (1) is fixedly connected to the mounting plate (2). Multiple mounting holes (201) are provided on both sides of the connection between the mounting plate (2) and the fixture (1), which are used to detachably install the fixture (1) onto the indexing head (7) by fasteners passing through the mounting holes (201).

7. A fixture for machining irregularly shaped castings according to claim 6, characterized in that: The indexing head (7) is connected to a motor (8), which can drive the indexing head (7) to rotate the fixture (1) around the rotation axis, thereby realizing the angle adjustment of the casting (3) in the work station slot on the fixture (1) during the processing.

8. A fixture for machining irregularly shaped castings according to claim 7, characterized in that: The indexing head (7) and the fixture (1) are mounted on the machine tool (9). The machine tool (9) is equipped with a tool changer spindle (10) corresponding to the machining position of the fixture (1). The tool changer spindle (10) can rotate in coordination with the angle of the fixture (1) to cut the machining surface of the casting (3).

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