Tool clamp for machining small-range pressure sensor

Abstract

The utility model relates to the technical field of pressure sensor machining, in particular to a tool clamp for machining a small-range pressure sensor, which comprises a base body, a gland and a connecting piece, the base body is clamped on a machine tool clamp, the end face of the base body is axially provided with a positioning cavity, a core body is located in the positioning cavity, the side wall of the core body is tightly attached to the inner wall of the positioning cavity, and the gland is arranged on the base body. The central axes of the core body, the positioning cavity and the base body coincide; the gland is connected with the end, provided with the positioning cavity, of the base body. The connecting piece is used for fixedly connecting the gland and the base body. The end face of a blind hole to be machined of the core abuts against the gland; the core body is positioned by the tool clamp and the positioning cavity, and the connecting piece fixes the gland on the base body, so that the core body and the base body are tightly attached, when the blind hole is processed, the processing stress can be transmitted to the base body through the core body, and the phenomenon that the quality of the pressure sensor is influenced due to plastic deformation of the bottom of the blind hole is avoided.

Description

Technical Field

[0001] This application relates to the field of pressure sensor processing technology, specifically to a tooling fixture for processing small-range pressure sensors. Background Technology

[0002] When processing a pressure sensor, the steel plate material and the sensitive material layer used in the pressure sensor are first surface treated. Then, a fusion material layer is laid on the steel plate material, followed by a sensitive material layer. After multiple processes such as heating, pressurizing, and compounding, a multi-layer composite of the pressure sensor is formed. The composite is then divided into multiple cores, and blind holes are processed on each core. The pressure-sensing diaphragm of the pressure sensor is formed at the bottom of the blind holes.

[0003] In existing technologies, when machining blind holes in a core, the outer circle of the core is usually clamped directly by a machine tool fixture, exposing the surface to be machined for the blind hole. The blind hole machining tool is aligned with the center of the end face of the core. The machining tool rotates at high speed and continuously approaches the core. When it comes into contact with the core, it cuts the end face of the core. The distance at which the machining tool penetrates into the core is continuously adjusted to achieve the machining and forming of the blind hole.

[0004] For pressure sensors with small range, the pressure-sensing diaphragm is thin and has a large diameter. During contact with a high-speed rotating cutting tool, the bottom of the blind hole is easily affected by processing stress, resulting in plastic deformation. This affects the pressure sensor's sensitivity, nonlinearity, hysteresis, repeatability, creep and other indicators, thereby reducing the yield of the pressure sensor. Utility Model Content

[0005] To reduce the impact of machining stress on small-range pressure sensors, this application provides a tooling fixture for machining small-range pressure sensors.

[0006] The tooling fixture for machining small-range pressure sensors provided in this application adopts the following technical solution:

[0007] A tooling fixture for machining small-range pressure sensors includes: a base, a gland, and a connector. The base is clamped on a machine tool fixture, and the central axis of the machine tool fixture coincides with that of the base. A positioning cavity is provided axially on the end face of the base, and a core is disposed within the positioning cavity. The side wall of the core is tightly fitted with the inner wall of the positioning cavity, and the central axes of the core, the positioning cavity, and the base coincide. The gland is connected to the end of the base with the positioning cavity, and the connector is used to fix the gland and the base together. The end face of the core with the blind hole to be machined abuts against the gland.

[0008] By adopting the above technical solution, the core is first placed into the positioning cavity, exposing the surface of the blind hole to be machined. The sidewall of the core is tightly fitted with the inner wall of the positioning cavity. Then, the pressure cap is fixedly connected to the base, and the core is pressed between the pressure cap and the positioning cavity on the base to achieve positioning and fixation of the core. Finally, the outer circle of the base is clamped using a machine tool fixture to achieve positioning and fixation of the tooling fixture. When machining the blind hole of the core, the rotating tool is aligned with the surface of the blind hole to be machined and continuously approaches the core until it contacts the core. The tool cuts the end face of the core. As the tool continues to penetrate the core, the blind hole is machined into shape. The tooling fixture and positioning cavity position the core, and the connecting parts achieve a tight fit between the core and the base by fixing the pressure cap to the base. When machining the blind hole, the machining stress can be transferred to the base through the core, which helps to avoid plastic deformation at the bottom of the blind hole, thus affecting the quality of the pressure sensor.

[0009] In one specific implementation, the inner diameter of the positioning cavity is slightly larger than the diameter of the core, and the positioning cavity is in transition fit with the core.

[0010] By adopting the above technical solution, the positioning cavity and the core are fitted together, so that the core can be tightly installed in the positioning cavity, avoiding the core from shaking in the positioning cavity. This also prevents the central axis of the core from not coinciding with the central axis of the positioning cavity, which would cause the blind hole to shift in position when it is processed, thus affecting the quality of the pressure sensor.

[0011] In one specific implementation scheme, an exhaust hole is provided at one end of the substrate away from the positioning cavity, and the exhaust hole is provided along the axial direction of the substrate;

[0012] The central axis of the exhaust port coincides with the central axis of the positioning cavity, and the exhaust port is connected to the positioning cavity.

[0013] By adopting the above technical solution, the exhaust port is connected to the positioning cavity. When the core is placed into the positioning cavity, the gas in the positioning cavity is discharged through the exhaust port, which avoids the core not being able to fit tightly against the bottom of the positioning cavity due to excessive air pressure in the positioning cavity. When the core is taken out of the positioning cavity, the positioning cavity is connected to the outside through the exhaust port, which avoids the core being firmly adsorbed in the positioning cavity due to insufficient air pressure in the positioning cavity.

[0014] In one specific implementation, the connector includes a plurality of connecting bolts; the plurality of connecting bolts are evenly distributed circumferentially along the end face of the gland; the connecting bolts pass through the end face of the gland and are threadedly connected to the end face of the base having a positioning cavity.

[0015] By adopting the above technical solution, the connecting parts are set up so that the connecting bolts pass through the gland and are threaded to the base body, so that the gland presses the core body tightly in the positioning cavity, thereby avoiding relative movement between the core body and the base body when processing blind holes, which would affect the processing quality of blind holes.

[0016] In one specific implementation, the connector further includes a plurality of elastic washers fitted onto the connecting bolts and located between the base and the gland.

[0017] By adopting the above technical solution, the elastic washer can increase the friction between the base and the gland, and prevent the connecting bolts from loosening due to processing vibration during the blind hole processing of the core, which would cause the core to shake in the positioning cavity, thereby improving the processing quality of the blind hole.

[0018] In one specific implementation, the pressure cap is provided with a clearance hole that penetrates the pressure cap;

[0019] The central axis of the clearance hole coincides with the central axis of the positioning cavity, and the diameter of the clearance hole is larger than the diameter of the blind hole to be processed in the core.

[0020] By adopting the above technical solution, the avoidance hole is set so that when machining blind holes, the rotating machining tool passes through the avoidance hole to cut the base. The diameter of the avoidance hole is larger than the diameter of the blind hole to be machined in the core, which avoids interference between the machining tool and the pressure cap, thereby avoiding damage to the tooling fixture.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. The tooling fixture is set up so that the positioning cavity positions the core. The connecting piece fixes the pressure cap to the base, thereby achieving a tight fit between the core and the base. When processing the blind hole, the processing stress can be transferred to the base through the core, which helps to avoid plastic deformation at the bottom of the blind hole, thus affecting the quality of the pressure sensor. Attached Figure Description

[0023] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0024] Figure 1 This is a schematic diagram of the installation of a tooling fixture for processing small-range pressure sensors according to this application.

[0025] Figure 2 This is a schematic diagram of the overall structure of a tooling fixture for processing small-range pressure sensors according to this application.

[0026] Figure 3 yes Figure 2 The enlarged view of part A is intended to illustrate the connector.

[0027] Figure descriptions: 1. Base; 11. Positioning cavity; 12. Exhaust hole; 2. Pressure cap; 21. Clearance hole; 3. Connector; 31. Connecting bolt; 32. Elastic washer; 4. Core; 41. Blind hole; 5. Machine tool fixture. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a tooling fixture for machining small-range pressure sensors.

[0032] Reference Figure 1 and Figure 2 A tooling fixture for machining small-range pressure sensors includes: a base 1, a pressure cap 2, and a connector 3. The base 1 is cylindrical, and a machine tool fixture 5 clamps the outer diameter of the base 1, with the central axis of the machine tool fixture 5 coinciding with the central axis of the base 1. A positioning cavity 11 is axially formed on the end face of the base 1, with the opening of the positioning cavity 11 exposed, and the inner contour of the positioning cavity 11 matches the outer contour of the core 4. The core 4 is disposed in the positioning cavity 11, and the end face of the core 4 matches the outer contour of the core 4. The bottom of the positioning cavity 11 is fitted together, and the inner diameter of the positioning cavity 11 is slightly larger than the diameter of the core 4. The positioning cavity 11 and the core 4 are transitionally fitted, and the central axes of the core 4, the positioning cavity 11, and the base 1 coincide. The end face of the blind hole 41 to be processed in the core 4 is exposed. The end face of the base 1 away from the positioning cavity 11 is provided with an exhaust hole 12. The exhaust hole 12 is opened along the axial direction of the base 1, and the central axis of the exhaust hole 12 coincides with the central axis of the positioning cavity 11. The exhaust hole 12 is connected to the positioning cavity 11. The pressure cap 2 is fixedly connected to the base 1 through the connector 3.

[0033] Reference Figure 2 and Figure 3 The connector 3 includes multiple connecting bolts 31 and elastic washers 32. The connecting bolts 31 pass through the pressure cap 2 and are threaded to the end face of the base 1 where the positioning cavity 11 is provided. The multiple connecting bolts 31 are evenly distributed circumferentially along the end face of the pressure cap 2. The pressure cap 2 abuts against the end face of the blind hole 41 to be processed in the core 4. An avoidance hole 21 is provided at the center of the end face of the pressure cap 2. The central axis of the avoidance hole 21 coincides with the central axis of the positioning cavity 11. The avoidance hole 21 penetrates the pressure cap 2 axially, and the diameter of the avoidance hole 21 is larger than the diameter of the blind hole 41 to be processed, so that the processing tool can pass through the avoidance hole 21 to process the blind hole 41 in the core 4. The elastic washer 32 is sleeved on the connecting bolts 31 and is located between the base 1 and the pressure cap 2.

[0034] The implementation principle of the tooling fixture for processing small-range pressure sensors in this application is as follows: When it is necessary to process the blind hole 41 of the core 4, firstly, the core 4 is placed in the positioning cavity 11, and the gas in the positioning cavity 11 is discharged through the exhaust hole 12. The core 4 is tightly fitted with the inner wall of the positioning cavity 11. Then, multiple connecting bolts 31 are passed through the pressure cap 2, and an elastic washer 32 is fitted on each connecting bolt 31. Then, the connecting bolts 31 are adjusted to thread the multiple connecting bolts 31 to the end of the base 1 where the positioning cavity 11 is opened, so that the central axis of the clearance hole 21, the core 4, and the positioning cavity 11 are coincident. The elastic washer 32 is located between the base 1 and the pressure cap 2. The elastic washer 32 increases the friction between the base 1 and the pressure cap 2, and avoids the connecting bolts 31 from loosening due to processing vibration during the processing of the blind hole 41 of the core 4, which would cause the core 4 to shake in the positioning cavity 11, thereby facilitating the improvement of the processing quality of the blind hole 41. Then, force is applied to the connecting bolt 31, causing the pressure cap 2 and the base 1 to move closer together. The pressure cap 2 presses the core 4 against the positioning cavity 11. Finally, the outer wall of the base 1 is clamped by the machine tool fixture 5, with one end of the base 1 with the positioning cavity 11 exposed. The base 1 is adjusted to ensure that the central axis of the base 1 coincides with the central axis of the machine tool fixture 5. The machine tool fixture 5 positions and fixes the base 1. The rotating machining tool is aligned with the center of the end face of the core 4. The machining tool is moved to cut the end face of the core 4, thereby machining the blind hole 41. During the machining process, the core 4 and the base 1 are in close contact, and the machining stress is transferred to the base 1, which helps to avoid plastic deformation at the bottom of the core 4 and improves the yield of the pressure sensor. In particular, for machine tools with fixed machining tools, the machine tool fixture 5 can also drive the base 1 to rotate, bringing the base 1 closer to the machining tool. The machining tool cuts the end face of the core 4 to form a blind hole.

[0035] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.

Claims

1. A tooling fixture for machining small-range pressure sensors, characterized in that, include: The base (1), the pressure cap (2), and the connector (3) are provided. The base (1) is clamped on the machine tool fixture (5), and the central axis of the machine tool fixture (5) coincides with that of the base (1). The end face of the base (1) is provided with a positioning cavity (11) along the axial direction. The positioning cavity (11) is provided with a core (4). The side wall of the core (4) is closely fitted with the inner wall of the positioning cavity (11), and the central axis of the core (4), the positioning cavity (11), and the base (1) coincide. The pressure cap (2) is connected to one end of the base (1) where the positioning cavity (11) is opened. The connector (3) is used to fix the pressure cap (2) and the base (1). The end face of the blind hole (41) to be processed in the core (4) abuts against the pressure cap (2).

2. The tooling fixture for machining small-range pressure sensors according to claim 1, characterized in that, The inner diameter of the positioning cavity (11) is slightly larger than the diameter of the core (4), and the positioning cavity (11) and the core (4) are in transition fit.

3. The tooling fixture for machining small-range pressure sensors according to claim 1, characterized in that, The base (1) has an exhaust hole (12) at one end away from the positioning cavity (11), and the exhaust hole (12) is opened along the axial direction of the base (1); The central axis of the exhaust port (12) coincides with the central axis of the positioning cavity (11), and the exhaust port (12) is connected to the positioning cavity (11).

4. A tooling fixture for machining small-range pressure sensors according to claim 1, characterized in that, The connector (3) includes a plurality of connecting bolts (31); the plurality of connecting bolts (31) are evenly distributed circumferentially along the end face of the cover (2); the connecting bolts (31) pass through the end face of the cover (2) and are threadedly connected to the end face of the base (1) where the positioning cavity (11) is provided.

5. A tooling fixture for machining small-range pressure sensors according to claim 4, characterized in that, The connector (3) also includes a plurality of elastic washers (32), which are fitted onto the connecting bolt (31) and are located between the base (1) and the gland (2).

6. A tooling fixture for machining small-range pressure sensors according to claim 1, characterized in that, The pressure cap (2) has a clearance hole (21) that penetrates the pressure cap (2); The central axis of the clearance hole (21) coincides with the central axis of the positioning cavity (11), and the diameter of the clearance hole (21) is larger than the diameter of the blind hole (41) to be processed in the core (4).

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