Scribing-free rocker arm shaft seat boring machine clamp

Abstract

The utility model discloses a rocker arm shaft seat boring machine clamp which comprises a bottom plate. Three vertical plates perpendicular to one another are welded to the upper face of the bottom plate in a vertical angle mode, and two rows of parallel four adjustable supporting pads are installed on the middle vertical plate. And two adjustable supporting pads are arranged on the side-standing vertical plate on the right side. And a through hole which is concentric with the rocker arm mounting hole and is larger than the diameter of the rocker arm mounting hole is formed in each of the left side vertical plate and the right side vertical plate. Two positioning pins are arranged on the bottom plate, one positioning pin is a cylindrical pin, and the other positioning pin is a prismatic pin. A force bearing point is arranged on the bottom plate, and a set of elastic thread clamping mechanism is designed. The front end face of the bottom plate is a surface subjected to finish machining and is used for aligning the installation precision of the clamp. The clamp is accurate in positioning, reliable in clamping and easy to operate, a professional scribing platform and a specific scribing post do not need to be arranged, the labor cost is saved, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically to a scriberless rocker arm bearing boring machine fixture. Background Technology

[0002] The existing rocker arm bearing is a support for the rocker arm, playing a crucial role in positioning and supporting its installation. It transmits power to the rocker arm via the camshaft, a transmission component, to achieve valve opening and closing.

[0003] Traditional machining processes involve first scribing out the dimensional limits and baselines of each surface to be machined on the rocker arm bearing, followed by a second scribing process to define the dimensional limits of the rocker arm mounting holes. After alignment and installation on a CNC boring machine, the mounting holes are then bored to achieve the required dimensional accuracy. This method results in low machining accuracy, a long process cycle, requires a specialized scribing platform and dedicated scribing workstations, leading to high labor costs. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a scribing-free rocker arm bearing boring machine fixture, which solves the technical defects of existing technologies such as low machining accuracy, long process cycle, need to set up a professional scribing platform and specific scribing positions, and high labor costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a boring machine fixture for a rocker arm bearing, comprising a base plate, on which three mutually perpendicular vertical plates are welded at their corners. On the middle vertical plate, four adjustable positioning pads are installed in two parallel rows. On the right-side vertical plate, two adjustable positioning pads are provided. On each of the left and right-side vertical plates, a through hole concentric with the rocker arm mounting hole and larger than the diameter of the rocker arm mounting hole is machined for aligning the first piece and removing chips.

[0006] Preferably, the base plate is provided with two positioning pins.

[0007] Preferably, one of the locating pins is a cylindrical pin, and the other locating pin must be a diamond pin.

[0008] Preferably, the two end faces of the base plate have two rows of four parallel slots for fastening the fixture on the boring machine.

[0009] Preferably, the front end face of the base plate is a precision-machined surface, which is used to calibrate the installation accuracy of the fixture during subsequent installation.

[0010] The base plate is provided with one force-bearing point and a set of elastic threaded clamping mechanism.

[0011] Preferably, the elastic threaded clamping mechanism includes a support sleeve fixedly connected to the base plate.

[0012] The preferred elastic threaded clamping mechanism includes a pressure support mandrel fixedly connected to a base plate. A pressure spring is fitted onto the pressure support mandrel, and a pressure sleeve is movably fitted onto the upper part of the pressure spring. The upper part of the pressure sleeve is threaded, and a pressure plate is provided on the upper part of the pressure sleeve. A slotted round nut is screwed into the top of the pressure plate to lock it in place. An internal hexagonal pressure bolt is threaded to the upper end of the pressure support mandrel.

[0013] It is worth noting that the front end face of the fixture base plate, after the installation accuracy of the fixture on the machine tool is adjusted, is a surface that has been precision machined to a certain precision and serves as the installation reference for the fixture on the machine tool.

[0014] This utility model provides a non-marking rocker arm bearing boring machine fixture, which has the following advantages: This non-marking rocker arm bearing boring machine fixture adopts a "one-face, two-pin" positioning method. The rocker arm bearing is positioned on the fixture through the effective connection of a cylindrical pin and a prismatic pin on the bottom surface. Six adjustable support pads are provided on the central upright plate and the right-side upright plate, enhancing the rigidity of the process system. On the left and right upright plates of the base plate, one through hole concentric with the rocker arm mounting hole and larger than the diameter of the rocker arm mounting hole is machined for first-piece alignment and chip removal. One force-bearing point is provided on the base plate, and a set of elastic threaded clamping mechanism is designed to clamp the rocker arm bearing on the fixture. Two rows of four parallel through slots are opened on the front and rear end faces of the base plate for fixing the fixture on the machine tool. The front face of the base plate is selected, and after adjusting the installation accuracy of the fixture, it is precision machined to a certain precision, serving as the installation reference for the fixture on the machine tool. This fixture offers accurate positioning, reliable clamping, and simple operation. It eliminates the need for a dedicated scribing platform and scribing station, saving labor costs, shortening the process cycle, and improving product quality. Attached Figure Description

[0015] Figure 1 Schematic front view of the clamping structure of this utility model

[0016] Figure 2 Left view of the clamping structure of this utility model

[0017] Figure 3 Top view of this utility model

[0018] Figure 4 Schematic diagram of the clamping structure of this utility model (bottom view)

[0019] Figure 5 Cross-sectional view of the clamping mechanism of this utility model

[0020] In the diagram: 1-base plate, 2-vertical plate, 3-support plate one, 4-support plate two, 5-left vertical plate, 6-right vertical plate, 7-adjustable positioning pad, 8-cylindrical pin, 9-diamond pin, 10-elastic threaded clamping mechanism, 12-support sleeve, 13-pressure support mandrel, 14-pressure spring, 15-internal hexagonal pressure bolt, 16-pressure plate, 17-slotted round nut, 18-pressure sleeve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are all within the protection scope of the present utility model.

[0022] Existing line marking operations are inefficient, inaccurate, and costly in terms of manpower, necessitating the establishment of specialized line marking platforms and dedicated line marking positions.

[0023] In view of this, a non-marking rocker arm bearing boring machine fixture is provided, which adopts "one-sided two-pin" positioning. The rocker arm bearing is positioned on the fixture by the cooperation of the base plate 1 with one cylindrical pin 8 and one prismatic pin 9. Six adjustable positioning pads 7 are provided on the middle upright plate 2 and the right upright plate 6 on the right side, enhancing the rigidity of the process system. A single force-bearing point and a set of elastic threaded clamping mechanism 10 are designed to clamp the rocker arm bearing on the fixture. Two rows of four parallel through slots are opened on the front and rear end faces of the base plate 1 for the fixture's fixed installation on the machine tool. This fixture provides accurate positioning, reliable clamping, and simple operation, eliminating the need for a professional marking platform and specific marking positions. It eliminates the time wasted by the marking process, shortens the process cycle, and improves product accuracy.

[0024] Those skilled in the art can connect the components in this case sequentially, and the specific connection and operation sequence should refer to the following working principle. The detailed connection methods are well-known in the art; the following mainly describes the working principle and operation process.

[0025] Depend on Figures 1 to 5A boring machine fixture for a rocker arm bearing without scribing is described. It includes a base plate 1, with vertical plates 2, 5, and 6 welded perpendicularly to each other at their upper corners, as well as a support plate 3 and a support plate 4. Two rows of four adjustable positioning pads 7 are arranged in parallel on the central vertical plate 2 at corresponding positions. Two adjustable positioning pads 7 are arranged at corresponding positions on the right vertical plate 6, which enhances the rigidity of the process system. On the left vertical plate 5 and right vertical plate 6 on the base plate 1, each is machined with a through hole concentric with the rocker arm mounting hole and larger than the diameter of the rocker arm mounting hole, for alignment of the first piece and chip removal.

[0026] Furthermore, two locating pins are set on the top of the base plate, one cylindrical pin 8 and one prismatic pin 9, which restrict the six degrees of freedom of the rocker arm bearing.

[0027] Furthermore, a force-bearing point is set at a corresponding position on the base plate, and a set of elastic threaded clamping mechanism 10 is designed. It is particularly noteworthy that the elastic threaded clamping mechanism 10 includes a support sleeve 12 fixedly connected to the base plate 1, and a pressure support spindle 13 fixedly connected to the base plate 1. A pressure spring 14 is sleeved on the pressure support spindle 13, and a pressure sleeve 18 is movably sleeved on the upper part of the pressure spring 14. The upper part of the pressure sleeve 18 is threaded. A pressure plate 16 is provided on the upper part of the pressure sleeve 18, and a slotted round nut 17 is screwed into the upper part of the pressure plate 16 to lock the pressure plate. A hexagonal internal pressure bolt 15 is movably connected to the upper end of the pressure sleeve 18. The hexagonal internal pressure bolt 15 is threadedly connected to the pressure support spindle 13.

[0028] Furthermore, the front end face of the base plate 1 is selected, and after the installation accuracy of the fixture is adjusted, the machined surface that has been precision machined to a certain precision is used as the installation reference for the fixture on the machine tool.

[0029] This surface will be used later when installing the fixture to check the installation accuracy of the fixture.

[0030] Specifically, place the fixture on the worktable of the CNC boring machine, and use the precision-machined front end face of the base plate 1 as the installation reference for the fixture on the machine tool. After pre-adjusting the installation accuracy, insert four T-nuts into the T-slots of the worktable, slide them to the positions of the four through slots on the fixture base plate, screw in the locking bolts, put on the hexagonal nuts, and pre-tighten them with a wrench. After checking the installation accuracy of the fixture on the machine tool through the machined surface of the front end face of the base plate, tighten it with force to complete the positioning and installation of the fixture on the machine tool.

[0031] Two precision-machined holes on the bottom surface of the rocker arm bearing are aligned with the two positioning pins 8 and 9 on the base plate 1 and lowered. After adjusting the pressure plate 16 to the force-bearing position, the hexagonal pressure bolt 15 on the spring thread clamping mechanism 10 is tightened with an Allen wrench. The pressure spring 14 is compressed. When the hexagonal pressure bolt 15 is tightened, it generates positive pressure on the pressure support spindle 13 of the connected part, resulting in friction between the contact surfaces. The friction prevents the relative movement between the hexagonal pressure bolt 15 and the pressure support spindle 13 of the connected part, thus completing the clamping of the rocker arm bearing on the fixture.

[0032] After the rocker arm bearing seat is positioned and clamped on the fixture, the hole that has been machined on the left side plate 5, which is concentric with the rocker arm mounting hole and larger than the diameter of the rocker arm mounting hole, is used to calibrate the positional accuracy of the hole and then the boring of the rocker arm mounting hole of the rocker arm bearing seat is completed.

[0033] After processing, use an Allen wrench to rotate in the opposite direction to loosen the Allen pressure bolt 15. The clamping force disappears, the pressure spring 14 releases the stored energy and returns to its original shape, the pressure plate 16 is removed from the stress point, the rocker arm shaft seat is removed, and the processing of the first rocker arm mounting hole is completed.

[0034] Align the two precision-machined holes on the bottom surface of the next rocker arm bearing with the two locating pins 8 and 9 on the base plate 1 and lower it down. After adjusting the pressure plate 16 to the force-bearing position, tighten the hexagonal pressure bolts 15 on the spring thread clamping mechanism 10 with an Allen wrench. After positioning and clamping the workpiece, there is no need to align the through hole on the left vertical plate 5; proceed directly to the boring operation and complete the boring of the batch of workpieces in sequence.

Claims

1. A scaffolding-free rocker arm bearing boring machine fixture, characterized in that: The system includes a base plate, on which three perpendicular upright plates are welded at the corners. On the middle upright plate, four adjustable positioning pads are installed in two parallel rows. On the right upright plate, two adjustable positioning pads are provided. On the left and right upright plates, one through hole is machined on each side, which is concentric with the rocker arm mounting hole and larger than the diameter of the rocker arm mounting hole, for the alignment and chip removal of the first piece.

2. The non-marking rocker arm bearing boring machine fixture according to claim 1, characterized in that: There are two locating pins on the top of the base plate.

3. The non-marking rocker arm bearing boring machine fixture according to claim 2, characterized in that: One of the locating pins is a cylindrical pin, and the other locating pin must be a diamond pin.

4. A scribe-free rocker arm bearing boring machine fixture according to claim 3, characterized in that: The base plate has four parallel slots on its front and rear end faces for fastening the fixture on the boring machine.

5. A scribe-free rocker arm bearing boring machine fixture according to claim 4, characterized in that: The front end face of the base plate is a precision-machined surface, which is used to calibrate the installation accuracy of the fixture when installing it later.

6. A scribe-free rocker arm bearing boring machine fixture according to claim 5, characterized in that: One force-bearing point is provided on the base plate, and one set of elastic threaded clamping mechanism is provided.

7. A scribe-free rocker arm bearing boring machine fixture according to claim 6, characterized in that: The elastic threaded clamping mechanism includes a support sleeve fixedly connected to the base plate.

8. A scribe-free rocker arm bearing boring machine fixture according to claim 7, characterized in that: The elastic threaded clamping mechanism includes a pressure support mandrel fixedly connected to a base plate. A pressure spring is sleeved on the support mandrel, and a pressure sleeve is movably sleeved on the upper part of the pressure spring. The upper part of the pressure sleeve is threaded, and a pressure plate is provided on the upper part of the pressure sleeve. A slotted round nut is screwed into the upper part of the pressure plate to lock the pressure plate. The upper end of the pressure support mandrel is threadedly connected to an internal hexagonal pressure bolt.

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