Fixture for batch positioning and machining of super-long ejector pins

Abstract

The invention discloses a fixture for batch positioning and processing of super-long ejector pins, which belongs to the technical field of ejector pin fixtures and comprises a base, a positioning column, a fixing block and a positioning block. The base and the fixing block are arranged at an interval, the base is located below the fixing block, and the base and the fixing block are connected through two positioning columns; the ejector pins sequentially penetrate through the base and the fixing block and are attached to the positioning faces of the ejector pins through the positioning block located at the bottom of the base. Batch clamping is achieved through the multiple positioning holes, synchronous calibration is achieved through cooperation of the positioning blocks and the dovetail grooves, the machining stability is guaranteed through a double-supporting structure, the batch machining efficiency of the ultra-long ejector pins is greatly improved, the positioning precision and the machining qualification rate are remarkably improved, and the labor cost and material loss are reduced. The clamp is simple in structure, convenient to operate, high in universality and suitable for batch machining scenes of various super-long ejector pins.

Description

Technical Field

[0001] This invention belongs to the technical field of ejector pin fixtures, specifically relating to a fixture for batch positioning and processing of ultra-long ejector pins. Background Technology

[0002] In mold forming and machining (such as turning and grinding), workpiece positioning, support, and demolding are core processes that ensure machining accuracy and production efficiency. Ejector pins, as key components in these processes, have been widely used. Ejector pins are typically rod-shaped structures with a pointed tip or a working surface at one end and a connection to the drive mechanism at the other. They achieve workpiece positioning, finished product demolding, or machining assistance through axial pushing or radial support. Their structural accuracy and stability directly affect the dimensional tolerances and surface quality of the workpiece, making them indispensable in injection molds, stamping dies, and precision machining equipment.

[0003] In mold part processing, many extra-long ejector pins exceed 100mm in length. When processing these ejector pins, they need to be clamped upside down with flat-nose pliers or placed on a platform against a long stop for processing. During the processing, a dial indicator is needed to flatten the ejector pin positioning surface for vertical and datum positioning. Because the ejector pin positioning surface is very small, flattening is very difficult and requires constant adjustment and correction, which is time-consuming and prone to clamping errors that can lead to scrap. These extra-long ejector pins are too long to be processed together and can only be processed one by one, resulting in extremely low efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a fixture for batch positioning and machining of ultra-long ejector pins, thereby solving the problem that existing ultra-long ejector pins are too long to be machined together, resulting in low efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A fixture for batch positioning and machining of ultra-long ejector pins, comprising a base, a positioning pin, a fixing block, and a positioning block; The base and the fixing block are spaced apart, with the base located below the fixing block. The base and the fixing block are connected by two positioning posts, and the fixing block moves on the positioning posts. Multiple ejector pins pass through the base and the fixing block in sequence, and are flattened by the positioning block located at the bottom of the base.

[0006] Furthermore, a first positioning hole is provided at each of the two ends of the top of the base along the first direction, and the first positioning hole is used to accommodate the fixed positioning post; a plurality of first ejector pin positioning holes are provided between the two first positioning holes along the first direction, and the first ejector pin positioning holes are used to accommodate ejector pins; pin holes are provided at both ends of the side of the base along the second direction, and the pin holes cooperate with the pins to fix the positioning post in the first positioning hole.

[0007] Furthermore, a first groove is formed at the bottom of the base along its length direction. The first groove penetrates the bottom of the base and communicates with two first positioning holes and multiple first ejector pin positioning holes. A second groove is formed on the side of the base. The positioning block is embedded in the second groove and slides within the second groove. The second groove extends along the width direction of the base to the semicircular position of the first ejector pin positioning hole.

[0008] Furthermore, the second groove includes a rectangular groove and a dovetail groove, wherein the dovetail groove is located at the middle position above the rectangular groove, and the dovetail groove and the rectangular groove are interconnected.

[0009] Furthermore, the positioning block has the same shape as the second groove, including a dovetail block and a rectangular block, with the dovetail block located at the upper middle position of the rectangular block; the positioning block slides within the second groove to simultaneously press multiple ejector pin positioning planes against each other.

[0010] Furthermore, the fixing block has a cuboid structure, with a second positioning hole at each of its top two ends along the first direction. The second positioning hole is used to accommodate the fixing positioning post. Between the two second positioning holes, a plurality of second ejector pin positioning holes are provided along the first direction. The second ejector pin positioning holes are used to accommodate ejector pins. The side of the fixing block has a plurality of screw holes. The screw holes cooperate with the screws to fix the positioning post in the second positioning hole and to fix the ejector pin in the second ejector pin positioning hole.

[0011] Furthermore, the positioning pin is fixed in the first positioning hole and the second positioning hole, and the ejector pin is fixed in the first ejector pin positioning hole and the second ejector pin positioning hole.

[0012] Furthermore, the first direction and the second direction are perpendicular to each other.

[0013] The fixture for batch positioning and machining of ultra-long ejector pins provided by this invention has the following beneficial effects: 1. This invention utilizes multiple ejector pin positioning holes on the base and fixing block to achieve simultaneous clamping and positioning of multiple extra-long ejector pins, overcoming the drawback of traditional machining methods that only allow for single-piece processing. Compared to existing flat-jaw vises with inverted clamping or stop-assisted positioning, this fixture can accommodate multiple extra-long ejector pins at once, eliminating the need for individual leveling and calibration with a dial indicator, significantly shortening clamping and adjustment time and substantially improving batch processing efficiency. Simultaneously, the standardized design of the positioning holes ensures consistent installation posture for each ejector pin, providing a fundamental guarantee for subsequent machining accuracy and effectively reducing machining errors caused by differences in individual piece clamping.

[0014] 2. This invention achieves simultaneous flattening and calibration of multiple ejector pin positioning surfaces through the cooperation of a positioning block and a second groove with a dovetail groove structure, solving the technical pain points of small positioning surfaces and difficulty in flattening traditional ejector pins. The positioning block can slide along the second groove, and by utilizing the precise cooperation between the dovetail block and the dovetail groove, it simultaneously aligns with the positioning surfaces of all ejector pins during the sliding process, eliminating the need for individual adjustment and correction. This not only simplifies the clamping operation process but also avoids positioning deviations caused by manual adjustments, reducing the risk of ejector pin scrap due to clamping errors. In addition, the embedded design of the positioning block and the groove improves positioning stability, ensuring that the ejector pin positioning surfaces remain in contact during processing, further guaranteeing processing accuracy.

[0015] 3. This invention employs a double-support structure where the base and fixing block are connected by positioning pins. This provides stable axial support for the structural characteristics of ultra-long ejector pins, effectively preventing shaking or deformation of the ejector pins due to their excessive length during processing. The positioning pins are doubly fixed using pins and screws, while the ejector pins are fixed by screws through positioning holes. The overall structure is highly rigid and stable, ensuring stable posture during the processing of ultra-long ejector pins. Furthermore, the modular design of the fixture provides excellent versatility, allowing the number of ejector pins to be adjusted according to batch processing requirements, adapting to different batch processing scenarios for ultra-long ejector pins, thus enhancing the fixture's practical value and applicability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the fixture used for batch positioning and machining of ultra-long ejector pins, as an example. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the fixture used for batch positioning and machining of ultra-long ejector pins, as an example. Figure 2 .

[0018] Figure 3 This is a schematic diagram of the base structure for an embodiment. Figure 1 .

[0019] Figure 4 This is a schematic diagram of the base structure for an embodiment. Figure 2 .

[0020] Figure 5 This is a schematic diagram of the fixed block structure in an embodiment.

[0021] Figure 6 This is a schematic diagram of the positioning block structure in an embodiment.

[0022] Among them, 1. base; 11. first groove; 12. first positioning hole; 13. first ejector pin positioning hole; 14. rectangular groove; 15. pin hole; 16. dovetail groove; 2. positioning post; 3. fixing block; 31. second positioning hole; 32. screw hole; 33. second ejector pin positioning hole; 4. positioning block; 41. dovetail block; 42. rectangular block; 5. ejector pin; 51. ejector pin positioning surface. Detailed Implementation

[0023] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0024] This embodiment presents a fixture for batch positioning and machining of ultra-long ejector pins. This fixture solves the problems of difficult clamping and alignment of ultra-long ejector pins, and the inability to process them in batches. It improves clamping efficiency, reduces the risk of scrap due to clamping and leveling errors, and batch processing can improve machining efficiency and reduce machining costs. (See reference...) Figure 1 and Figure 2 Specifically, it includes: Base 1, two positioning posts 2, fixing block 3 and positioning block 4; In some embodiments, the base 1 and the fixing block 3 are spaced apart, with the base 1 located below the fixing block 3. The base 1 and the fixing block 3 are connected by two positioning posts 2 to form a whole. Multiple ejector pins 5 pass through the base 1 and the fixing block 3 in sequence, and are flattened against the positioning surfaces of the multiple ejector pins 5 by positioning blocks 4 located at the bottom of the base 1. The fixing block 3 moves on the positioning posts 2 to accommodate the processing of ejector pins 5 of different lengths.

[0025] In one specific embodiment, reference is made to Figure 3 and Figure 4 The base 1 is a rectangular parallelepiped structure. At both ends of its top, a first positioning hole 12 is provided along the first direction. The first positioning hole 12 is used to accommodate and fix the positioning post 2. Between the two first positioning holes 12, a plurality of first ejector pin 5 positioning holes 13 are provided along the first direction. The first ejector pin 5 positioning holes 13 are used to accommodate ejector pins 5. At both ends of the side of the base 1, pin holes 15 are provided along the second direction. Pins are inserted into the pin holes 15 to fix the positioning post 2 in the first positioning hole 12.

[0026] The first direction is the vertical direction, which is the direction of the height of the base 1; the second direction is the direction of the width of the base 1. The first direction and the second direction are perpendicular to each other. With this design, the positioning post 2 can be fixed in the first positioning hole 12 by inserting a pin into the pin hole 15.

[0027] The base 1 has a first groove 11 at its bottom along its length. The first groove 11 penetrates the bottom of the base 1 and communicates with two first positioning holes 12 and multiple first ejector pin positioning holes 13. The base 1 has a second groove on its side. The positioning block 4 is embedded in the second groove and slides in the second groove. The second groove extends along the width of the base 1 to the semicircular position of the first ejector pin positioning hole 13.

[0028] The second groove includes a rectangular groove 14 and a dovetail groove 16. The dovetail groove 16 is located in the middle position above the rectangular groove 14, and the dovetail groove 16 and the rectangular groove 14 are connected to each other. In this way, when the positioning block 4 slides and positions, it can not only make the positioning block 4 flat against the ejector pin positioning surface 51, but also give the ejector pin positioning surface 51 a pre-tightening force to make it more stable.

[0029] In one specific embodiment, reference is made to Figure 6 The positioning block 4 has the same shape as the second groove, and includes a dovetail block 41 and a rectangular block 42. The dovetail block 41 is located in the upper middle position of the rectangular block 42. The positioning block 4 slides in the second groove to simultaneously press the positioning planes of multiple ejector pins 5 against each other.

[0030] In this embodiment, the positioning block 4 is designed in a dovetail shape. By cooperating with the second groove at the bottom of the base 1, it can slide back and forth within the platform of the base 1. During the clamping process, it can be adjusted according to the size of the positioning surface 51 of the ejector pin, so that the ejector pins 5 of different sizes of positioning surfaces can remain vertical and consistent. At the same time, it can keep the positioning surfaces of the ejector pins 5 clamped in the base 1 parallel and vertical, so that they can be processed in batches. In this embodiment, ejector pins 5 of any length in the range of 100mm to 250mm can be clamped in batches.

[0031] In one specific embodiment, reference is made to Figure 5 The fixing block 3 is a cuboid structure, with a second positioning hole 31 at each of its top two ends along the first direction. The second positioning hole 31 is used to accommodate the fixing positioning post 2. Between the two second positioning holes 31, a plurality of second ejector pin positioning holes 33 are provided along the first direction. The second ejector pin positioning holes 33 are used to accommodate the ejector pin 5. A plurality of screw holes 32 are provided on the side of the fixing block 3. The screw holes 32 cooperate with the screws to fix the positioning post 2 in the second positioning hole 31 and fix the ejector pin 5 in the second ejector pin positioning hole 33.

[0032] The fixing block 3 has a pin 5 hole. When the pin 5 is clamped, it passes through the second positioning hole 31 and is then fixed with screws. There are 6 types of fixing blocks 3, and the second positioning hole 31 of each type of fixing block 3 is different, corresponding to the commonly used pin 5 size of 1mm to 6mm (for example, when machining a 2mm pin 5, the fixing block 3 is replaced with a fixing block 3 with a 2mm second positioning hole 31). This ensures that 80% of the pins 5 can be used. The fixing block 3 can slide up and down through the positioning pin 2 to adjust the appropriate height for machining according to the different heights of the pins 5.

[0033] In one specific embodiment, the positioning post 2 is fixed in the first positioning hole 12 and the second positioning hole 31. The positioning post 2 supports the connection between the base 1 and the fixing block 3, allowing the fixing block 3 to slide up and down through the positioning post 2 to match ejector pins 5 of different lengths. The ejector pin 5 is fixed in the first ejector pin positioning hole 13 and the second ejector pin positioning hole 33.

[0034] The method of using the fixture for batch positioning and machining of extra-long ejector pins in this embodiment is as follows: Insert the ejector pins 5 into the bottom of the base 1, ensuring that the positioning surfaces 51 of the ejector pins face outwards. Slide the positioning blocks 4 on the fixture to move them deeper, ensuring that the positioning surfaces of all ejector pins 5 are flush with the sides of the positioning blocks 4, maintaining consistency. Then, place the fixture and ejector pins 5 on a pre-leveled magnetic platform, allowing them to adhere. Adjust the height of the fixing block 3 according to the length of the ejector pins 5 to achieve a convenient machining height. Finally, tighten the positioning blocks 4 and ejector pins 5 with screws. This process ensures consistent positioning of extra-long ejector pins 5, eliminating the need to use a dial indicator to level each positioning surface individually. Furthermore, the consistent spacing and position of each ejector pin 5 allow for the simultaneous machining of multiple pieces.

[0035] This invention achieves batch clamping through multiple positioning holes, synchronous calibration through the cooperation of positioning block 4 and dovetail groove 16, and ensures processing stability through a double support structure. This not only significantly improves the batch processing efficiency of extra-long ejector pins 5, but also substantially increases positioning accuracy and processing pass rate, while reducing labor costs and material waste. This fixture has a simple structure, is easy to operate, and is highly versatile, making it suitable for batch processing scenarios of various extra-long ejector pins 5.

[0036] Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by a person skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A fixture for batch positioning and machining of ultra-long ejector pins, characterized in that, Includes base, positioning post, fixing block and positioning block; The base and the fixing block are spaced apart, with the base located below the fixing block. The base and the fixing block are connected by two positioning posts, and the fixing block moves on the positioning posts. Multiple ejector pins pass through the base and the fixing block in sequence, and are flattened by the positioning block located at the bottom of the base.

2. The fixture for batch positioning and machining of ultra-long ejector pins according to claim 1, characterized in that, The base has a first positioning hole at each of its two ends along a first direction, which is used to accommodate a fixed positioning post; between the two first positioning holes, a plurality of first ejector pin positioning holes are provided along the first direction, which are used to accommodate ejector pins; the base has pin holes at both ends along a second direction, which are used to fix the positioning post in the first positioning hole by cooperating with the pin.

3. The fixture for batch positioning and machining of ultra-long ejector pins according to claim 2, characterized in that, The base has a first groove along its length at its bottom, the first groove penetrates the bottom of the base and communicates with two first positioning holes and multiple first ejector pin positioning holes; the base has a second groove on its side, the positioning block is embedded in the second groove and slides in the second groove; the second groove extends along the width of the base to the semicircular position of the first ejector pin positioning hole.

4. The fixture for batch positioning and machining of ultra-long ejector pins according to claim 3, characterized in that, The second groove includes a rectangular groove and a dovetail groove. The dovetail groove is located at the middle position above the rectangular groove, and the dovetail groove and the rectangular groove are connected to each other.

5. The fixture for batch positioning and machining of ultra-long ejector pins according to claim 4, characterized in that, The positioning block has the same shape as the second groove, and includes a dovetail block and a rectangular block. The dovetail block is located at the upper middle position of the rectangular block. The positioning block slides in the second groove to simultaneously press multiple ejector pin positioning planes against each other.

6. The fixture for batch positioning and machining of ultra-long ejector pins according to claim 2, characterized in that, The fixing block has a cuboid structure, with a second positioning hole at each of its top two ends along a first direction. The second positioning hole is used to accommodate the fixing positioning post. Between the two second positioning holes, a plurality of second ejector pin positioning holes are provided along the first direction. The second ejector pin positioning holes are used to accommodate ejector pins. The side of the fixing block has a plurality of screw holes. The screw holes and screws cooperate to fix the positioning post in the second positioning hole and fix the ejector pin in the second ejector pin positioning hole.

7. The fixture for batch positioning and machining of ultra-long ejector pins according to claim 6, characterized in that, The positioning pin is fixed in the first positioning hole and the second positioning hole, and the ejector pin is fixed in the first ejector pin positioning hole and the second ejector pin positioning hole.

8. The fixture for batch positioning and machining of ultra-long ejector pins according to claim 6, characterized in that, The first direction and the second direction are perpendicular to each other.

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