Fixing clamp

Abstract

The utility model provides a fixing clamp which is used for fixing a workpiece to be machined in a machining center. The stationary fixture includes: a chuck base connected to a base of a machining center; the pre-supporting assembly is connected to the chuck base and used for pre-supporting the workpiece and adjusting the axis of the workpiece to pass through the geometric center of the clamping opening of the pair of clamping jaws; the limiting assembly is arranged on the chuck base and used for adjusting the circumferential angle and the axial position of the workpiece to the machining position; and the pair of clamping jaws is installed on the chuck base and can move relative to each other on the sliding way of the chuck base so as to clamp a workpiece through the clamping opening when the pair of clamping jaws are closed, and the pair of clamping jaws is used for subsequent machining. According to the fixing clamp, various similar parts can be positioned and clamped through replacement of parts.

Description

Technical Field

[0001] This utility model relates to a fixing device for fixing workpieces. More specifically, this utility model relates to a fixing fixture for fixing workpieces in a machining center. Background Technology

[0002] On the production line of a common rail system, there are many similar components that share some structural features. However, on the existing production lines for these components, each component typically requires a corresponding set of fixtures for securing it. Therefore, many different fixtures are needed to accommodate different components, resulting in high fixture costs.

[0003] In any case, sharing a single fixture for several components with similar characteristics can reduce costs.

[0004] Therefore, there is a need in the art for a common fixing fixture that can be used to fix several parts with similar features, thereby reducing the production cost of the product. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a reusable device to reduce the production cost of workpieces.

[0006] To address the aforementioned technical problems, according to one aspect of this utility model, a fixing fixture is provided for fixing a workpiece to be processed in a machining center. The fixing fixture includes: a chuck base connected to the base of the machining center; a pre-support assembly connected to the chuck base for pre-supporting the workpiece and adjusting the workpiece's axis to the machining position; a limiting assembly disposed on the chuck base for adjusting the circumferential angle and axial position of the workpiece to the machining position; and a pair of clamping jaws mounted on the chuck base and movable relative to each other on a slide of the chuck base to clamp the workpiece through the jaws when the pair of clamping jaws are closed for subsequent processing.

[0007] According to a preferred embodiment of the present invention, the limiting component includes: a support base fixed to the chuck base and having a groove at the top; a limiting block slidably mounted in the groove of the support base via a protrusion at the bottom and movable along the groove; an angle adjusting ring shaped to be received in a recess of the limiting block and movable in the recess in a circumferential direction; an adjusting pin vertically fixed to the angle adjusting ring and movable together with the angle adjusting ring to adjust the circumferential angle of the workpiece by inserting the adjusting pin into the angle adjusting block of the workpiece; and an air sensor shaped to be received in the recess of the limiting block and having an interface that is airtightly fitted to the end of the workpiece to control the internal air pressure of the workpiece during the processing of the workpiece.

[0008] According to a preferred embodiment of the present invention, the angle adjustment ring is provided with a plurality of pin holes for the adjustment pin to be selectively installed thereon.

[0009] According to a preferred embodiment of the present invention, the circumferential length of the angle adjustment ring is at least half a circumference, so as to achieve 360-degree angle adjustment.

[0010] According to a preferred embodiment of the present invention, there are multiple limiting base blocks, and the multiple limiting base blocks have different sizes.

[0011] According to a preferred embodiment of the present invention, the pre-support assembly includes a first pre-support assembly and a second pre-support assembly located on both sides of the pair of clamping claws, the first pre-support assembly and the second pre-support assembly being used to support the workpiece near its two ends.

[0012] According to a preferred embodiment of the present invention, there are multiple first pre-support components, and the multiple first pre-support components have different sizes.

[0013] According to a preferred embodiment of the present invention, the first pre-support component is connected to the chuck base via the limiting component.

[0014] According to a preferred embodiment of the present invention, the clamping diameter of the jaws of the pair of clamping claws is in the range of 19-35mm.

[0015] According to a preferred embodiment of the present invention, the clamping diameter of the jaws of the pair of clamping claws is in the range of 19-25mm, or in the range of 25-30mm, or in the range of 30-35mm.

[0016] The present invention provides a fixing fixture that can clamp multiple workpieces by means of a limiting component that can flexibly adjust the circumferential angle and axial position of the workpiece, thereby reducing production costs and improving production efficiency. Attached Figure Description

[0017] To enable those skilled in the art to more fully understand this utility model, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Wherein:

[0018] Figure 1 This is a perspective view of the fixing clamp of this utility model; and

[0019] Figure 2 for Figure 1 The front view of the positioning component of the fixed clamp shown. Detailed Implementation

[0020] To make the present invention clearer, a specific embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to the embodiment described below.

[0021] It should be noted that the directional terms used in this article, such as "up" and "down", "top" and "bottom", "left" and "right", are only for the purpose of explaining the structure of the product with reference to the accompanying drawings. The directions indicated are only the approximate directions shown in the accompanying drawings and do not necessarily represent the actual direction of use of the product.

[0022] This invention provides a fixing fixture 1 for precisely positioning and fixing a workpiece 2 in, for example, a five-axis machining center, for high-precision machining such as milling and drilling. The workpiece 2 to be machined is, for example, a common rail injector body. The injector body is typically pre-fixed to an angle positioning block, and the two are placed together on the fixing fixture 1 for subsequent positioning and machining. In the following description, the workpiece 2 is exemplified by an injector body, but is not limited to this.

[0023] The fixed fixture 1 includes a chuck base 11, a pre-support assembly, a limiting assembly, and a pair of clamping jaws 14. The pre-support assembly, the limiting assembly, and the pair of clamping jaws 14 are all directly or indirectly mounted on the chuck base 11, and then connected to the base of the five-axis machining center through the chuck base 11, so that the workpiece 2 can be accurately positioned by the fixed fixture 1 when it is machined in the five-axis machining center.

[0024] In this article, vertical movement refers to movement along the direction perpendicular to the base of the five-axis machining center under normal conditions, which is usually the vertical direction. Horizontal movement refers to movement along the axis parallel to the workpiece, which is usually the movement towards or away from the clamping jaws along the direction perpendicular to the extension of the pair of clamping jaws.

[0025] The pair of clamping jaws 14 are typically mounted directly on the chuck base 11 and are movable relative to each other on the chuck base 11 to clamp the workpiece 2 through their jaws for subsequent finishing when the pair of clamping jaws 14 are closed. The projection of the geometric center of the jaws of the pair of clamping jaws 14 onto the chuck base 11 is fixed, that is, vertically aligned with the geometric center of the chuck base 11. When the chuck base 11 has a circular profile, the pair of clamping jaws 14 are mounted approximately along the diameter of the circular profile, thereby ensuring that when the workpiece is clamped by the pair of clamping jaws 14, the axis of the workpiece 2 passes through the geometric center of the jaws, thus ensuring precise positioning of the workpiece 2 during machining.

[0026] According to one embodiment of the present invention, the clamping diameter of the pair of clamping jaws 14 is, for example, in the range of 19-35 mm. In other words, workpieces with an outer diameter in the range of 19-35 mm can be clamped by the pair of clamping jaws 14. Considering the overall size of the fixing fixture of the present invention, the clamping jaws are usually provided in multiple sets, each set being used to clamp workpieces with different diameter ranges. According to an exemplary embodiment, three sets of clamping jaws can be considered, the diameter ranges of the workpieces 2 they clamp being, for example, 19-25 mm, 25-30 mm, and 30-35 mm, respectively.

[0027] Before precisely positioning the workpiece 2 on the fixed clamp 1, the workpiece 2 needs to be pre-supported on a pre-support assembly. The pre-support assembly typically supports the workpiece 2 near both ends to align its axis through the geometric center of the clamping jaws. Therefore, the pre-support assembly includes a first pre-support assembly 121 and a second pre-support assembly 122 located on either side of the pair of clamping jaws 14, supporting the workpiece 2 near both ends, respectively. The first pre-support assembly 121 is a structural block with an upwardly notched recess for pre-supporting one end of the workpiece 2. This recess can be used to support the outer surface of the workpiece 2 or to support an angular positioning block of the workpiece. The second pre-support assembly 122 includes a structural block with an upwardly notched recess for supporting the outer surface of the other end of the workpiece 2. The specific shape of the recess is not limited; according to a preferred embodiment, it can be a basic V-shape.

[0028] According to the requirements of workpiece 2, the first pre-support component 121 can be configured as a group of multiple components, each with different dimensions, and can be replaced based on the dimensions of the workpiece to be processed. For example, the first pre-support component 121 can be configured as a short structural block with a large notch or a tall structural block with a small notch, to be used for short and thick workpieces and long and thin workpieces, respectively. The first pre-support component 121 can also be configured as a plate with a pin, which can be used to support the angle positioning block pre-fixed on the workpiece 2, which is very advantageous when space is limited. The first pre-support component 121 is located inside the limiting component, that is, between the limiting component and a pair of clamping claws 14. According to one embodiment of the present invention, the first pre-support component 121 can be fixedly installed on the limiting component and move with the limiting base block 132 of the limiting component. The first pre-support component 121 can also be directly installed on the chuck base 11 and can be configured to move left and right on the track of the chuck base 11.

[0029] The second pre-support assembly 122 is located on the other side of the pair of clamping claws 14, that is, on the side opposite to the first pre-support assembly 121. The second pre-support assembly 122 includes a notched structural block and a device for controlling the movement of the notched structural block relative to the chuck base 11 in all directions. According to one embodiment, the device for controlling the movement of the notched structural block relative to the chuck base 11 in all directions can be configured as a mounting frame having both left-right and right-right movement tracks, which cooperate to allow the notched structural block to move in all directions. According to another embodiment, the device for controlling the movement of the notched structural block in the second pre-support assembly 122 can also be a hydraulic mechanism known in the art. Further details are omitted here.

[0030] A limiting component is disposed on the chuck base 11, outside the pre-support component, and is used to adjust the circumferential angle and axial position of the workpiece 2, which is pre-supported on the pre-support component. In this document, the circumferential angle of the workpiece 2 refers to the angle of rotation of the workpiece relative to its own axis. As an example, adjusting the circumferential angle may be, for example, changing the position of a hole on the injector body as the injector body rotates, such as rotating and positioning a hole on the injector body vertically upward / downward / forward / backward, etc. The axial position refers to the position of the workpiece relative to the chuck base 11 along its axial direction. As an example, adjusting the axial position may be, for example, adjusting the clamped position or the position to be processed of the injector body.

[0031] The limiting assembly includes a support base 131, a limiting base block 132, an angle adjustment ring 133, an adjustment pin 135, and an air sensor 134.

[0032] The support base 131 is fixed to the chuck base 11 and has a groove 1310 on its top. The number of grooves 1310 is not limited, but preferably multiple, to accommodate the size of the workpiece 2 and the size of the limiting base 132. The method of fixing the support base 131 to the chuck base 11 is not limited, but preferably a screw connection. This support base 131 is universal, and limiting bases 132 of various sizes can be slidably mounted onto it.

[0033] The limiting base block 132 is slidably mounted in the channel 1310 of the support base 131 via protrusions 1320. The protrusions 1320 are disposed at the bottom of the limiting base block 132, and their shape and number correspond to the shape and number of the channel 1310, thereby allowing the two to fit together and move relative to each other. The limiting base block 132 is also provided with a recess for accommodating the angle adjustment ring 133 and a recess for accommodating the air sensor 134.

[0034] Angle adjustment ring 133 is shaped to fit within a recess in the limiting base block 132, allowing it to move within the recess. The angle adjustment ring 133 is typically a circular ring, with its circumference preferably greater than a semicircle. This allows for 360-degree angle adjustment as the angle adjustment ring 133 moves circumferentially within the recess in the limiting base block 132. The recess on the limiting base block 132 has a shape consistent with the angle adjustment ring 133, but is slightly larger, to ensure smooth movement of the angle adjustment ring 133 within the recess. If necessary, a shim with a shape matching the angle adjustment ring 133 can be provided to fine-tune the axial position of the angle adjustment ring 133 by increasing its thickness.

[0035] An adjusting pin 135 is fixedly mounted on the angle adjusting ring 133 and can move together with the angle adjusting ring 133, thereby adjusting the circumferential angle of the workpiece 2. The adjusting pin 135 is mounted perpendicular to the angle adjusting ring 133 and protrudes towards the workpiece 2. During angle adjustment, the adjusting pin 135 is inserted into an angle positioning block pre-installed on the workpiece. As the position of the adjusting pin 135 changes, it can drive the workpiece 2 to rotate, thereby controlling the circumferential angle of the workpiece 2. The angle adjusting ring 133 is provided with a plurality of pin holes for mounting the adjusting pin 135, thereby allowing the position of the adjusting pin 135 to be changed according to the size requirements of the workpiece. The number of pin holes is not limited, but preferably three pin holes are provided, located at both ends and the middle of the angle adjusting ring 133, respectively.

[0036] An air sensor 134 is shaped to fit within a recess in the limiting base 132. The air sensor 134 has an interface 1340 that hermetically engages with the end of the workpiece 2. This interface 1340 hermetically engages with the end of the workpiece 2 to control the internal air pressure during processing. The air sensor 134 is a block-shaped body, with its interface 1340 facing the end of the workpiece 2 and hermetically engaging with the end of the workpiece. As is known in the art, the other end of the air sensor 134 is connected to a pressure control device. If necessary, a shim conforming to the shape of the air sensor 134 can be provided to fine-tune the axial position of the air sensor 134 by increasing the thickness of the block.

[0037] According to one embodiment, taking into account the overall size of the fixture and the size requirements of the workpiece being processed, the limiting components can be configured as multiple sets, each set of limiting components can have different sizes, so that they can be replaced as needed.

[0038] The fixing fixture of this invention allows for the pre-support of the workpiece onto the fixture via a pre-support component. Then, the circumferential angle and axial position of the workpiece are precisely adjusted using a limiting component. Finally, a pair of clamping jaws clamp the workpiece, achieving stable fixation on a five-axis machining center. Once everything is ready, the workpiece can be precision-machined on the machining center, such as milling or drilling. Multiple sets of the pre-support component, limiting component, and clamping jaws can be configured to be interchanged according to the workpiece's dimensional requirements, improving the versatility of the fixing fixture.

[0039] This invention offers the following beneficial technical effects. By using a single set of fixtures instead of a custom-made fixture for each component, production costs are significantly reduced. The replaceable design of the fixture components makes maintenance and upgrades easier. Overall, this fixture design aims to reduce costs and enhance production line flexibility through the replaceability of the device's components.

[0040] The above specific embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Those skilled in the art can make various modifications and variations without departing from the inventive concept of the present utility model; therefore, all equivalent technical solutions fall within the protection scope of the present utility model, which is defined by the appended claims.

Claims

1. A fixing fixture (1) for fixing a workpiece (2) to be processed in a machining center, characterized in that, The fixing clamp (1) includes: Chuck base (11), which is connected to the base of the machining center; A pre-support assembly, which is connected to the chuck base (11), is used to pre-support the workpiece (2) and adjust the axis of the workpiece (2) to the machining position; A limiting assembly, disposed on the chuck base (11), is used to adjust the circumferential angle and axial position of the workpiece (2) to the machining position; and A pair of gripping jaws (14) are mounted on the chuck base (11) and are movable relative to each other on the slide of the chuck base (11) to grip the workpiece (2) through the jaws when the pair of gripping jaws (14) are closed for subsequent processing.

2. The fixing clamp (1) according to claim 1, characterized in that, The limiting component includes: A support base (131) is fixed to the chuck base (11) and has a channel (1310) on the top; A limiting base block (132) is slidably mounted in the channel (1310) of the support base (131) by means of a bottom protrusion (1320) and is movable along the channel (1310); An angle adjustment ring (133) is shaped to fit into the recess of the limiting base block (132) and is able to move in the recess along the circumferential direction. An adjusting pin (135), which is vertically fixed on the angle adjusting ring (133), is movable together with the angle adjusting ring (133) to adjust the circumferential angle of the workpiece (2) by inserting the adjusting pin (135) into the angle adjusting block of the workpiece (2); and An air sensor (134) is shaped to fit into the recess of the limiting base (132) and has an interface (1340) that is hermetically fitted to the end of the workpiece (2) to control the air pressure inside the workpiece during the processing of the workpiece.

3. The fixing clamp (1) according to claim 2, characterized in that, The angle adjustment ring (133) is provided with a plurality of pin holes for the adjustment pin (135) to be selectively installed thereon.

4. The fixing clamp (1) according to claim 2, characterized in that, The circumferential length of the angle adjustment ring (133) is at least half a circumference, so as to enable 360-degree angle adjustment.

5. The fixing clamp (1) according to any one of claims 2 to 4, characterized in that, There are multiple limiting base blocks (132), and each of the multiple limiting base blocks (132) has a different size.

6. The fixing clamp (1) according to claim 1, characterized in that, The pre-support assembly includes a first pre-support assembly (121) and a second pre-support assembly (122) located on both sides of the pair of clamping claws (14), the first pre-support assembly (121) and the second pre-support assembly (122) being used to support the workpiece (2) near its two ends.

7. The fixing clamp (1) according to claim 6, characterized in that, There are multiple first pre-support components (121), and each of the multiple first pre-support components (121) has a different size.

8. The fixing clamp (1) according to claim 6 or 7, characterized in that, The first pre-support component (121) is connected to the chuck base (11) via the limiting component.

9. The fixing clamp (1) according to any one of claims 1 to 4, characterized in that, The clamping diameter of the jaws of the pair of clamping claws (14) is in the range of 19-35 mm.

10. The fixing clamp (1) according to claim 9, characterized in that, The clamping diameter of the jaws of the pair of clamping claws (14) is in the range of 19-25mm, or in the range of 25-30mm, or in the range of 30-35mm.

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