High-precision milling positioning clamp for machining slender shaft products
By designing a high-precision milling positioning fixture and utilizing a combination of arc grooves and pins, the problem of unstable clamping of slender shaft products on a milling machine was solved, achieving high-precision machining results.
Patent Information
- Application Number
- CN202520173457.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-26
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-01-26
AI Technical Summary
In the existing technology, slender shaft products are difficult to clamp stably in a milling machine vise, resulting in poor machining accuracy.
A high-precision milling positioning fixture was designed, including a base plate, a pressure block, a limiting block, and a pin. By setting arc-shaped grooves and positioning grooves on the base plate, combined with the matching design of the pressure block and the pin, the product can be stably fixed and limited, ensuring the consistency of clamping and positioning.
It improves the machining accuracy of slender shaft products, ensures that the hole shape and position tolerances meet the drawing requirements, simplifies the clamping process, and improves the stability of clamping.
Smart Images
Figure CN223789981U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tooling and fixture technology, specifically to a high-precision milling positioning fixture for machining slender shaft products. Background Technology
[0002] The throttle valve is a controllable valve that regulates the amount of air entering the engine. After entering the intake manifold, the air mixes with gasoline to form a combustible mixture, which is then burned to produce power. The throttle valve is connected to the air filter above and the engine block below, and is often referred to as the throat of a car engine.
[0003] The throttle shaft is a crucial component in the automotive throttle assembly, and its production process requires milling two holes. Due to its slender shape and complex internal structure, coupled with the high dimensional and positional tolerances of the holes to be machined, ordinary milling machine vises are insufficient for clamping and positioning. Even when clamped, unstable clamping can lead to poor machining accuracy. Therefore, it is necessary to customize a special fixture based on the product structure to ensure consistent clamping and positioning during milling, guarantee that the hole dimensional and positional tolerances meet the drawing requirements, and improve machining accuracy. Utility Model Content
[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a high-precision milling positioning fixture for machining slender shaft products, so as to solve the technical problems of difficulty in clamping slender shaft products with milling machine vises and poor machining accuracy in the prior art.
[0005] To solve the above-mentioned technical problems, this utility model provides a high-precision milling positioning fixture for machining slender shaft products, including a base plate, a pressure block, a limiting block, and a pin. The base plate is provided with a positioning groove and several first arc-shaped grooves that match the product and are used for installing the product. One end of the first arc-shaped groove is connected to the positioning groove so that when the product is installed in the first arc-shaped groove, one end of the product abuts against the end face of the positioning groove. The other end of the first arc-shaped groove penetrates through the side wall of the base plate so that the other end of the product can protrude from the other end of the first arc-shaped groove. The bottom end of the pressure block is provided with a second arc-shaped groove that matches the product. The pressure block is fixedly connected to the base plate so that the product is fixed between the base plate and the pressure block. The limiting block is connected to the side wall of the base plate, and a pin is connected to the limiting block for abutting against the other end of the product.
[0006] With the above structure, the high-precision milling positioning fixture for machining slender shaft products of this utility model has the following advantages: several first arc-shaped grooves are set on the base plate for mounting multiple products, and the first arc-shaped grooves and the second arc-shaped grooves on the pressure block are designed according to the arc-shaped structure of the product, so that the product is stably fixed between the base plate and the pressure block. In addition, the two ends of the product are respectively limited and fixed by positioning grooves and pins, ensuring the consistency of clamping and positioning of the product during milling, improving the machining accuracy, and making the hole shape and position tolerance of the product meet the drawing requirements.
[0007] As an improvement, each pair of adjacent first arc-shaped grooves corresponds to one pressure block, and each pressure block is provided with two second arc-shaped grooves; with this structure, one pressure block fixes two products, which simplifies the clamping process and ensures the stability of the clamping.
[0008] As an improvement, a positioning pin is connected to the base plate and is connected to the pressure block. The pressure block is fixed to the base plate by bolts. With this structure, the positioning pin ensures that the pressure block will not shift its position after being subjected to force during processing, thus ensuring the processing accuracy of the product.
[0009] As an improvement, the bolt is connected at the center of the length of the pressure block, and the locating pin is spaced apart from the bolt along the length of the pressure block. With this structure, the bolt is placed at the center so that the clamping force of the pressure block on the two products is uniform and stable, while the locating pin is off-center to prevent the pressure block from being installed backwards.
[0010] As an improvement, each pair of adjacent first arc-shaped grooves corresponds to a limiting block, and each limiting block is connected to two pins.
[0011] As an improvement, each first arc-shaped groove corresponds to two pressure blocks distributed along the length of the first arc-shaped groove; this structure improves the stability of clamping.
[0012] As an improvement, the pin is slidably connected to the limiting block along the length of the first arc-shaped groove. The outer peripheral wall of the pin has an annular protrusion along the circumferential direction. A spring is sleeved on the pin, and the two ends of the spring abut against the protrusion and the limiting block, respectively. With this structure, the spring force causes the pin to move towards the product, thereby pressing the product and preventing the product from sliding and shifting position during processing, thus improving processing accuracy. Furthermore, the spring design makes it easier to place the product into the first arc-shaped groove by simply pushing the pin away from it during clamping.
[0013] As an improvement, several first arc-shaped grooves are distributed along the length of the base plate, and positioning grooves are set along the length of the base plate and located in front of several first arc-shaped grooves. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model.
[0015] Figure 2 This is a schematic diagram of the base plate portion of this utility model.
[0016] Figure 3 This is a schematic diagram of the structure of the pressure block in this utility model.
[0017] Reference numerals: 1. Base plate; 2. Pressure block; 3. Limiting block; 4. Pin; 5. Positioning groove; 6. First arc groove; 7. Second arc groove; 8. Positioning pin; 9. Protrusion; 10. Spring; 11. Threaded hole. Detailed Implementation
[0018] The high-precision milling positioning fixture for machining slender shaft products according to this utility model will be described in detail below with reference to the accompanying drawings.
[0019] like Figures 1 to 3 As shown, a high-precision milling positioning fixture for machining slender shaft products includes a base plate 1, a pressure block 2, a limiting block 3, and a pin 4. The base plate 1 is provided with a positioning groove 5 and several first arc-shaped grooves 6 that match the product and are used for mounting the product. For example... Figure 1 As shown, a plurality of first arc-shaped grooves 6 are distributed along the length direction of the base plate 1, and positioning grooves 5 are arranged along the length direction of the base plate 1 and located in front of the plurality of first arc-shaped grooves 6. Figure 1 Although the first arc-shaped groove 6 is not shown, products placed on it are illustrated. These products are distributed along the length of the base plate 1. The length of the first arc-shaped groove 6 is the same as the width of the base plate 1. (See reference.) Figure 2 .
[0020] like Figure 2 As shown, one end of the first arc-shaped groove 6 is connected to the positioning groove 5, so that when the product is installed in the first arc-shaped groove 6, one end of the product abuts against the end face of the positioning groove 5. The other end of the first arc-shaped groove 6 penetrates the side wall of the base plate 1, so that the other end of the product can protrude from the other end of the first arc-shaped groove 6. Figure 3 As shown, the bottom end of the pressure block 2 is provided with a second arc-shaped groove 7 that matches the product. The pressure block 2 is fixedly connected to the base plate 1 so that the product is fixed between the base plate 1 and the pressure block 2. In other words, the second arc-shaped groove 7 on the pressure block 2 fits the upper side wall of the product.
[0021] In this embodiment, the base plate 1 is made of 45# steel and heat-treated to HRC35-40. The base plate 1 has a length of 700mm, a width of 100mm, and a thickness of 40mm, which can improve the rigidity of the entire fixture and ensure that the fixture is not easily deformed during the product processing. The base plate 1 has 12 first arc-shaped grooves 6 with a length of 80mm and a radius of 3mm, so as to match the outer diameter of the product. Correspondingly, the pressure block 2 is made of 45# steel and heat-treated to HRC28-32. The second arc-shaped groove 7 has a length of 15mm and a radius of 3mm, so as to match the outer diameter of the product. When the pressure block 2 fixes the product, it ensures that the pressure block 2 can secure the product.
[0022] The pressure block 2 for all products on the fixed base plate 1 can be one or more. In this embodiment, every two adjacent first arc-shaped grooves 6 correspond to one pressure block 2, and each pressure block 2 is provided with two second arc-shaped grooves 7, as can be seen from the following. Figure 1 and Figure 3 Furthermore, each first arc-shaped groove 6 corresponds to two pressing blocks 2 distributed along the length of the first arc-shaped groove 6; in the case of the product, that is, every two adjacent products are fixed by two pressing blocks 2, one pressing block 2 fixes the front end of the two products, and the other pressing block 2 fixes the rear end of the two products, thereby exposing the part to be processed in the middle of the product.
[0023] like Figure 2 As shown, a positioning pin 8 connected to the pressure block 2 is attached to the base plate 1. The pressure block 2 is fixed to the base plate 1 by bolts. In this embodiment, the bolts are connected at the center along the length of the pressure block 2, and the positioning pins 8 are spaced apart from the bolts along the length of the pressure block 2. Figure 2 Bolts are not shown, but threaded holes 11 on the base plate 1 for bolt connection are shown. The threaded holes 11 are located in the middle of the two first arc-shaped grooves 6, and the locating pins 8 are spaced apart from the threaded holes 11.
[0024] like Figure 3 As shown, in this embodiment, the pressure block 2 has a 6.5mm diameter inner hole in the center for installing M6 bolts to connect with the base plate 1 to fix the product. There is a 3mm diameter hole on the right side of the inner hole for connecting the positioning pin 8 to prevent the pressure block 2 from being installed backwards.
[0025] like Figure 1 and Figure 2 As shown, the limiting block 3 is connected to the side wall of the base plate 1. The limiting block 3 is connected to a pin 4 for abutting against the other end of the product. Specifically, the pin 4 is slidably connected to the limiting block 3 along the length direction of the first arc groove 6. The outer peripheral wall of the pin 4 is provided with an annular protrusion 9 along the circumferential direction. A spring 10 is sleeved on the pin 4. The two ends of the spring 10 abut against the protrusion 9 and the limiting block 3 respectively. In this embodiment, every two adjacent first arc grooves 6 correspond to one limiting block 3. Each limiting block 3 is connected to two pins 4. The limiting block 3 is made of 45# steel and heat-treated to HR28-32.
[0026] During clamping, simply push the pin 4 away from the first arc groove 6 to place the product into the first arc groove 6. After releasing the pin 4, the spring 10 drives the pin 4 to move towards the first arc groove 6, so that the product is pressed tightly between the positioning groove 5 and the pin 4. Then, fix the two pressure blocks 2, so that the product is stably fixed between the base plate 1 and the pressure blocks 2, ensuring the consistency of clamping and positioning of the product during milling, improving the machining accuracy, and making the hole shape and position tolerance of the product meet the drawing requirements.
[0027] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiment. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
Claims
1. A high precision milling fixture for machining elongated shaft products, characterized in that, The utility model relates to a product fixing device, including bottom plate (1), pressing block (2), limiting block (3) and pin column (4), be equipped with the positioning groove (5) and a plurality of with the product is matched and is used to install the first arc slot (6) of product on bottom plate (1), the first arc slot (6) one end with the positioning groove (5) intercommunication makes when product installation in the first arc slot (6), product one end with the end surface of positioning groove (5) abuts, the first arc slot (6) other end penetrates the side wall of bottom plate (1) makes product other end can be exposed from the first arc slot (6) other end in the first arc slot (6) outside, the bottom end of pressing block (2) is equipped with the second arc slot (7) that is matched with product, and pressing block (2) fixedly connected on bottom plate (1) makes product fixed between bottom plate (1) and pressing block (2), limiting block (3) is connected in the side wall of bottom plate (1), and limiting block (3) is connected with the pin column (4) for abutting with product other end on limiting block (3).
2. The high precision milling fixture for machining elongated shaft products according to claim 1, characterized in that, Every two adjacent first arc slot (6) correspond to a pressing block (2), and two second arc slots (7) are arranged on each pressing block (2).
3. The high-precision milling positioning jig for machining an elongated shaft product according to claim 1 or 2, characterized by, The bottom plate (1) is connected with the positioning pin (8) connected with the pressing block (2), and the pressing block (2) and the bottom plate (1) are fixed by bolts.
4. The high precision milling fixture for machining elongated shaft products according to claim 3, characterized in that, The bolt is connected to the center of the length direction of the pressing block (2), and the positioning pin (8) is arranged apart from the bolt along the length direction of the pressing block (2).
5. The high precision milling fixture for machining elongated shaft products of claim 1 wherein, Every two adjacent first arc slot (6) correspond to a pressing block (2), and two second arc slots (7) are arranged on each pressing block (2).
6. The high precision milling fixture for machining elongated shaft products of claim 1, wherein, Each first arc slot (6) corresponds to two pressing blocks (2) distributed along the length direction of the first arc slot (6).
7. The high precision milling fixture for machining elongated shaft products of claim 1, wherein, The pin column (4) is slidingly connected to the limiting block (3) along the length direction of the first arc slot (6), the outer peripheral wall of the pin column (4) is provided with a protruding portion (9) in the circumferential direction, a spring (10) is sleeved on the pin column (4), and the two ends of the spring (10) abut against the protruding portion (9) and the limiting block (3) respectively.
8. The high precision milling fixture for machining elongated shaft products of claim 1, wherein, A plurality of first arc slots (6) are distributed along the length direction of the bottom plate (1), and the positioning groove (5) is arranged along the length direction of the bottom plate (1) and located in front of the plurality of first arc slots (6).