Positioning mechanism for machining of die castings

Abstract

The utility model discloses a kind of positioning mechanisms for die casting machining, including the positioning pin for cooperating with the positioning reference hole on die casting and positioning, characterized in that linear drive mechanism for driving the positioning pin to do linear extension and contraction motion is connected and set on the positioning pin, linear drive mechanism drives the positioning pin to retract to facilitate the processing of positioning reference hole, linear drive mechanism drives the positioning pin to eject to realize the positioning of the positioning part of positioning pin and positioning reference hole cooperation to realize the positioning of die casting. Advantage is through telescopic positioning pin design, while ensuring high-precision positioning, the processing flow is optimized, both improve production efficiency, and reduce scrap rate, especially suitable for high-precision requirement die casting machining scene.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a positioning mechanism for machining die-cast parts. Background Technology

[0002] During the machining process of die-cast parts, slight deformation of the parts themselves and the fact that some holes were not machined (residual blank allowance) make it difficult to take points during coordinate measuring machine (CMM) measurements, affecting dimensional accuracy. This is especially true for die-cast parts with high dimensional accuracy requirements, often resulting in some dimensions exceeding tolerances after machining. Although the assembly relationship was optimized in consultation with the customer, the customer still requires full dimensional compliance; therefore, the machining process needs to be improved to ensure quality.

[0003] In existing technologies, datum holes are typically used for positioning during machining. However, due to burrs or excess material in the blank holes of die-cast parts, direct positioning may lead to inaccurate positioning, affecting the accuracy of subsequent machining. While adding a separate process to machine the datum holes can improve positioning accuracy, it increases the machining cycle time and reduces production efficiency. Therefore, how to ensure machining accuracy while avoiding additional processes has become a pressing technical problem. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a positioning mechanism for machining die-casting parts that has a simple structure and can effectively improve production efficiency.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A positioning mechanism for machining die-cast parts includes a positioning pin for engaging with a positioning reference hole on the die-cast part. A linear drive mechanism is connected to the positioning pin for driving the positioning pin to perform linear extension and retraction. The linear drive mechanism drives the positioning pin to retract to facilitate the machining of the positioning reference hole. The linear drive mechanism also drives the positioning pin to extend, so that the positioning part of the positioning pin engages with the positioning reference hole to achieve positioning of the die-cast part.

[0007] The linear drive mechanism includes a drive cylinder, which includes a cylinder body and a piston rod that is linearly telescopically mounted on the cylinder body. A positioning pin sleeve is coaxially fixed on the piston rod. The positioning pin is located inside the positioning pin sleeve, and the positioning part of the positioning pin extends out of the positioning pin sleeve. The drive cylinder drives the positioning pin sleeve to perform linear telescopic movement, thereby driving the positioning pin to perform synchronous linear telescopic movement.

[0008] It also includes a tooling base plate, on which a guide seat is provided. The guide seat has a through guide cavity for guiding the linear telescopic movement of the positioning pin sleeve. The positioning pin sleeve is telescopically and movably disposed in the guide cavity.

[0009] The piston rod and the positioning pin sleeve are coaxially fixedly connected by an adapter, and the adapter is detachably connected to both the piston rod and the positioning pin sleeve.

[0010] The positioning pin sleeve has an axially extending mounting cavity. The mounting cavity includes a guide portion and a limiting portion arranged coaxially in sequence. The inner diameter of the guide portion is smaller than the inner diameter of the limiting portion, forming a limiting step surface between them. The positioning pin includes a positioning portion and a main body rod portion arranged coaxially in sequence. A limiting protrusion ring is coaxially provided on the main body rod portion. The limiting protrusion ring and the positioning portion are respectively located at opposite ends of the main body rod portion. The main body rod portion is located inside the guide portion. The outer diameter of the limiting protrusion ring is larger than the inner diameter of the guide portion. The limiting protrusion ring is located inside the limiting portion. The limiting protrusion ring and the limiting step surface cooperate to prevent the positioning pin from disengaging.

[0011] The main body rod is telescopically and movably disposed within the guide portion, and a spring is disposed within the limiting portion, with the bottom end of the spring abutting against the limiting protrusion.

[0012] The limiting protrusion ring has a coaxial protrusion with a positioning protrusion, and one end of the spring is sleeved on the positioning protrusion and abuts against the limiting protrusion ring.

[0013] Compared with existing technologies, the advantages of this utility model are as follows: Through the telescopic positioning pin design, the processing flow is optimized while ensuring high-precision positioning, thereby improving production efficiency and reducing the scrap rate. It is particularly suitable for high-precision die-casting machining scenarios, possessing strong practicality and promotional value, specifically manifested in:

[0014] (1) By controlling the extension and retraction of the positioning pin through the linear drive mechanism, the positioning pin can be retracted before processing to avoid the burrs or allowance of the blank hole from interfering with the positioning and to ensure the accuracy of the positioning reference hole; after processing, the positioning pin is ejected and cooperates with the positioning reference hole to achieve high-precision positioning and reduce the problem of dimensional deviation caused by blank error.

[0015] (2) No additional process is required to process the positioning reference hole, reducing the processing cycle and improving the overall production efficiency; the linear drive mechanism (such as a cylinder or hydraulic cylinder) can realize the rapid and stable extension and retraction of the positioning pin, adapting to the needs of automated production;

[0016] (3) The structure is simple, requiring only a positioning pin and a linear drive mechanism. It is compact and easy to integrate into existing machining equipment. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 This is a cross-sectional view of the positioning pin sleeve in this utility model.

[0020] Figure 4 This is a cross-sectional view of the present invention in its positioning and use state;

[0021] Figure 5 This is a cross-sectional view of the present invention in the avoidance state. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] As shown in the figure, a positioning mechanism for machining die-cast parts includes a positioning pin 1 for positioning in conjunction with a positioning reference hole A1 on the die-cast part A. A linear drive mechanism is connected to the positioning pin 1 for driving the positioning pin 1 to perform linear extension and retraction. The linear drive mechanism drives the positioning pin 1 to retract to facilitate the machining of the positioning reference hole A1. The linear drive mechanism drives the positioning pin 1 to push out so that the positioning part 11 of the positioning pin 1 cooperates with the positioning reference hole A1 to achieve positioning of the die-cast part A.

[0024] In this specific embodiment, the linear drive mechanism includes a drive cylinder 2, which includes a cylinder body 21 and a piston rod 22 linearly telescopically mounted on the cylinder body 21. A positioning pin sleeve 3 is coaxially fixedly mounted on the piston rod 22. The positioning pin 1 is located inside the positioning pin sleeve 3, and the positioning part 11 of the positioning pin 1 extends out of the positioning pin sleeve 3. The drive cylinder 2 drives the positioning pin sleeve 3 to perform linear telescopic motion, thereby driving the positioning pin 1 to perform synchronous linear telescopic motion. The drive cylinder 2 provides reliable linear motion, ensuring smooth telescopic movement of the positioning pin 1, which is suitable for high-precision machining environments. The positioning pin 1 is separated from the positioning pin sleeve 3, forming a modular design, which facilitates maintenance and replacement, while reducing direct wear on the positioning pin 1 and extending its service life.

[0025] In this specific embodiment, a tooling base plate 4 is also included. A guide seat 5 is provided on the tooling base plate 4. A through guide cavity (not shown in the figure) is provided in the guide seat 5 to guide the linear telescopic movement of the positioning pin sleeve 3. The positioning pin sleeve 3 is telescopically and movably disposed in the guide cavity (not shown in the figure). The guide cavity (not shown in the figure) in the guide seat 5 ensures that the positioning pin sleeve 3 moves in a straight line, avoids deviation, and improves positioning accuracy. The tooling base plate 4 and the guide seat 5 are combined to enhance the overall rigidity, making it suitable for heavy-duty or high-vibration processing scenarios.

[0026] In this specific embodiment, the piston rod 22 and the positioning pin sleeve 3 are coaxially fixedly connected via an adapter 6. The adapter 6 is detachably connected to both the piston rod 22 and the positioning pin sleeve 3. The detachable connection of the adapter 6 to both the piston rod 22 and the positioning pin sleeve 3 facilitates the replacement or adjustment of the positioning pin sleeve 3, improving the flexibility of the device. Simultaneously, it ensures synchronized linear movement of the piston rod 22 and the positioning pin sleeve 3, reducing runout errors.

[0027] In this specific embodiment, the positioning pin sleeve 3 is provided with an axially penetrating mounting cavity 31. The mounting cavity 31 includes a guide portion 311 and a limiting portion 312 arranged coaxially in sequence. The inner diameter of the guide portion 311 is smaller than the inner diameter of the limiting portion 312, so that a limiting step surface 313 is formed between the two. The positioning pin 1 includes a positioning portion 11 and a main body portion 12 arranged coaxially in sequence. A limiting protrusion ring 13 is coaxially provided on the main body portion 12. The limiting protrusion ring 13 and the positioning portion 11 are respectively arranged at opposite ends of the main body portion 12. The main body portion 12 is arranged inside the guide portion 311. The outer diameter of the limiting protrusion ring 13 is larger than the inner diameter of the guide portion 311. The limiting protrusion ring 13 is arranged inside the limiting portion 312. The limiting protrusion ring 13 and the limiting step surface 313 cooperate to form an anti-disengagement limiting for the positioning pin 1. The limiting step surface 313 cooperates with the limiting protrusion ring 13 to prevent the positioning pin 1 from falling off during the extension and retraction process, thereby enhancing reliability; the guide part 311 cooperates with the main rod part 12 to ensure the accurate movement trajectory of the positioning pin 1 and reduce shaking.

[0028] In this specific embodiment, the main body rod 12 is telescopically movably disposed within the guide portion 311, and a spring 7 is disposed within the limiting portion 312, with the bottom end of the spring 7 abutting against the limiting protrusion 13. The spring 7 can be used to buffer the impact force of the positioning pin 1, preventing rigid collisions from damaging the workpiece or the positioning mechanism.

[0029] In this specific embodiment, a positioning protrusion 14 is coaxially protruded on the limiting protrusion ring 13. One end of the spring 7 is sleeved on the positioning protrusion 14 and abuts against the limiting protrusion ring 13. The positioning protrusion 14 ensures the fixed installation position of the spring 7, prevents the spring 7 from tilting, and ensures a stable buffering effect. The spring 7 is sleeved on the positioning protrusion 14, which makes installation convenient and reduces debugging time.

Claims

1. A positioning mechanism for machining die-cast parts, comprising a positioning pin for engaging with a positioning reference hole on the die-cast part, characterized in that... The positioning pin is connected to a linear drive mechanism for driving the positioning pin to perform linear extension and retraction. The linear drive mechanism drives the positioning pin to retract to facilitate the machining of the positioning reference hole. The linear drive mechanism also drives the positioning pin to push out, so that the positioning part of the positioning pin cooperates with the positioning reference hole to achieve positioning of the die-cast part.

2. The positioning mechanism for machining die-cast parts as described in claim 1, characterized in that... The linear drive mechanism includes a drive cylinder, which includes a cylinder body and a piston rod that is linearly telescopically mounted on the cylinder body. A positioning pin sleeve is coaxially fixed on the piston rod. The positioning pin is located inside the positioning pin sleeve, and the positioning part of the positioning pin extends out of the positioning pin sleeve. The drive cylinder drives the positioning pin sleeve to perform linear telescopic movement, thereby driving the positioning pin to perform synchronous linear telescopic movement.

3. The positioning mechanism for machining die-cast parts as described in claim 2, characterized in that... It also includes a tooling base plate, on which a guide seat is provided. The guide seat has a through guide cavity for guiding the linear telescopic movement of the positioning pin sleeve. The positioning pin sleeve is telescopically and movably disposed in the guide cavity.

4. The positioning mechanism for machining die-cast parts as described in claim 2, characterized in that... The piston rod and the positioning pin sleeve are coaxially fixedly connected by an adapter, and the adapter is detachably connected to both the piston rod and the positioning pin sleeve.

5. A positioning mechanism for machining die-cast parts as described in claim 2, characterized in that... The positioning pin sleeve has an axially extending mounting cavity. The mounting cavity includes a guide portion and a limiting portion arranged coaxially in sequence. The inner diameter of the guide portion is smaller than the inner diameter of the limiting portion, forming a limiting step surface between them. The positioning pin includes a positioning portion and a main body rod portion arranged coaxially in sequence. A limiting protrusion ring is coaxially provided on the main body rod portion. The limiting protrusion ring and the positioning portion are respectively located at opposite ends of the main body rod portion. The main body rod portion is located inside the guide portion. The outer diameter of the limiting protrusion ring is larger than the inner diameter of the guide portion. The limiting protrusion ring is located inside the limiting portion. The limiting protrusion ring and the limiting step surface cooperate to prevent the positioning pin from disengaging.

6. A positioning mechanism for machining die-cast parts as described in claim 5, characterized in that... The main body rod is telescopically and movably disposed within the guide portion, and a spring is disposed within the limiting portion, with the bottom end of the spring abutting against the limiting protrusion.

7. A positioning mechanism for machining die-cast parts as described in claim 6, characterized in that... The limiting protrusion ring has a coaxial protrusion with a positioning protrusion, and one end of the spring is sleeved on the positioning protrusion and abuts against the limiting protrusion ring.

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