A piston precision grinding tooling fixture

Abstract

This utility model discloses a piston precision grinding fixture, belonging to the field of workpiece honing technology. The utility model includes a spring steel expansion sleeve and a support body. The expansion sleeve includes an outer ring and an inner insert fixedly connected to the inner wall of the outer ring, with a tensioning gap formed in the outer ring wall. The support body includes a support platform, with an inner surface as the support surface and an outer surface having a fitting hole. The support body is connected to the inner insert through the fitting hole, with each fitting hole corresponding to the inner insert, achieving the fitting of the expansion sleeve and the support body. After the support platform is assembled around the perimeter, the inner surface of the support surface forms the piston's tensioning surface. In use, the support body is installed into the expansion sleeve, forming a tensioning cavity at the center to accommodate the piston. After tightening the honing expansion sleeve using a conventional honing machine tensioning device, the inner surface of the support surface forms a tensioning surface adapted to the piston's circumference, thus tightening and fixing the piston. The equipment is then started to process the piston. This solves the technical problems of high cost and short service life of existing piston honing fixtures.

Description

Technical Field

[0001] This utility model relates to the field of workpiece honing technology, and more specifically to a tooling fixture for piston precision grinding. Background Technology

[0002] With the rise of the automotive industry, the market demand for auto parts is increasing, and auto parts, especially cylinder pistons, have entered a growth market. As market competition in the auto parts industry intensifies, the processing costs and quality control of cylinder pistons are becoming increasingly stringent.

[0003] The existing cylinder piston machining uses nylon honing sleeves, which effectively protect the piston's outer surface. However, because these honing sleeves are machined as a single piece, each sleeve can only be used to produce products for a specific machine model, resulting in poor versatility. Furthermore, they require the use of cutting fluid in the operating environment, and traditional plastics are absorbent, leading to decreased precision and breakage over long-term use. Additionally, tooling costs are high, and the lifespan of the tooling is short. Utility Model Content

[0004] 1. Technical problem to be solved by the utility model

[0005] To address the aforementioned problems in existing cylinder piston machining technology, this utility model provides a piston precision grinding tooling fixture. By optimizing the clamping method, it can be repeatedly disassembled and reused, achieving the goal of long tooling service life and low tooling cost.

[0006] 2. Technical Solution

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0008] A piston precision grinding tooling fixture includes a spring steel expansion sleeve and a support body. The expansion sleeve includes an outer ring and an inner insert fixedly connected to the inner wall of the outer ring. The outer ring has a tension gap in its sleeve wall. The support body includes a support platform with an inner surface and an outer insertion hole. The support body is connected to the inner insert through the insertion hole. The insertion hole and the inner insert correspond one-to-one to achieve the insertion of the expansion sleeve and the support body. After the support platform is assembled around the perimeter, the inner surface of the support platform forms the piston's tension surface.

[0009] Further piston precision grinding tooling fixtures, the tension gap is opened vertically by staggered ends of the outer ring sleeve to achieve a stable and uniform tensioning effect.

[0010] Further piston precision grinding tooling fixtures have a curved surface that matches the circumference of the piston, achieving a seamless tensioning and fixing effect during piston machining.

[0011] Further piston precision grinding tooling fixtures, the lower part of the support body extends inward to form a support seat, which supports the bottom end face of the piston during piston machining.

[0012] Further piston precision grinding tooling fixtures are used, with a buffer gap between the seat and the backing surface to provide deformation space for the piston during machining.

[0013] Further piston precision grinding tooling fixtures are provided, with a guide slope on the upper part of the surface to guide the piston insertion.

[0014] 3. Beneficial effects

[0015] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0016] (1) The piston precision grinding tooling fixture of this utility model has an insert-type assembly of the expansion sleeve and the support body. The expansion sleeve can be reused, and the piston precision grinding can be adapted to different diameters by replacing the support body. It has good versatility and reduces the cost of changing lines.

[0017] (2) Compared with the honing expansion sleeve made of nylon material, the piston precision grinding tooling fixture of this utility model is made of spring steel, which has self-lubricating properties, more effectively protects the product, and has a long service life. Attached Figure Description

[0018] Figure 1 Axonometric schematic diagram of the tooling fixture for piston precision grinding;

[0019] Figure 2 for Figure 1 Top view;

[0020] Figure 3 for Figure 1 A bottom view;

[0021] Figure 4 for Figure 1 Exploded view.

[0022] In the diagram: 1-expansion sleeve; 11-outer ring sleeve; 12-tensioning gap; 13-inner platform;

[0023] 2-Backrest; 20-Tensioning cavity; 21-Backrest platform; 22-Backrest surface; 23-Backrest seat; 24-Fixing hole; 25-Buffer gap; 26-Embedding hole; 27-Guide slope. Detailed Implementation

[0024] To further understand the contents of this utility model, a detailed description of the utility model is provided in conjunction with the accompanying drawings.

[0025] Example

[0026] The piston precision grinding tooling fixture in this embodiment, such as Figure 1-4As shown, the device includes a spring steel expansion sleeve 1 and a support body 2. The expansion sleeve 1 includes an outer ring sleeve 11 and an inner embedded platform 13 fixedly connected to the inner wall of the outer ring sleeve 11. The sleeve wall of the outer ring sleeve 11 has a tension gap 12. The support body 2 includes a support platform 21. The inner side of the support platform 21 is a support surface 22, and the outer side has a fitting hole 26. The support body 2 is connected to the inner embedded platform 13 through the fitting hole 26. The fitting hole 26 and the inner embedded platform 13 correspond one-to-one to realize the fitting of the expansion sleeve 1 and the support body 2. After the support platform 21 is assembled around the perimeter, the support surface 22 on the inner side forms the tensioning surface of the piston. Both the inner embedded platform 13 and the support platform 21 have vertically adapted fixing holes 24. After assembly, the inner embedded platform 13 and the support platform 21 are fixedly connected by a screw passing through the fixing hole 24.

[0027] The tension gap 12 is vertically opened by the upper and lower ends of the outer ring sleeve 11 in a staggered manner, so as to achieve a tensioning effect of stable and uniform force application from top to bottom.

[0028] The surface 22 is an arc surface, and the curvature matches the circumference of the piston, so that the piston can be seamlessly tightened and fixed during processing.

[0029] The lower part of the support body 2 extends inward to form a support seat 23, which supports the bottom end face of the piston during piston machining.

[0030] A buffer gap 25 is provided between the seat 23 and the surface 22 to provide deformation space for the piston during machining.

[0031] A guide slope 27 is provided on the upper part of the surface 22 to guide the piston to insert downward or upward.

[0032] In this embodiment, the tooling fixture is used in the following way: the support body 2 is installed into the expansion sleeve 1, and a tensioning cavity 20 for accommodating the piston is formed at the center. After the honing expansion sleeve 1 is tightened by the existing honing machine tensioning device, the inner side support surface 22 forms a tensioning surface that adapts to the circumferential surface of the piston, thereby tightening and fixing the piston. The equipment is then started to perform honing processing on the piston.

[0033] The tooling fixture in this embodiment can ensure circumferential surface contact between the piston and the tooling equipment, uniformly transfer the load, reduce local stress concentration, and is reusable and low in cost. It can effectively achieve the effect of simultaneously controlling investment costs, honing costs and machining accuracy.

[0034] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention. The actual structure and manufacturing steps are not limited to these. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A piston finish machining tooling fixture characterized by, Including price increases and price reliance, among which: The expansion sleeve includes an outer ring sleeve and an inner embedded platform fixedly connected to the inner wall of the outer ring sleeve. The sleeve wall of the outer ring sleeve has an expansion gap. The backrest includes a backrest platform, the inner side of which is the backrest surface, and the outer side is provided with a fitting hole. The body is connected to the embedded platform through the insertion hole.

2. The piston finish-machining fixture of claim 1, wherein: The tension gap is vertically opened by offsetting the two ends of the outer ring.

3. The piston finish machining fixture of claim 1, wherein: The contact surface is curved, and its curvature is adapted to the circumference of the piston.

4. The piston finish machining fixture of claim 3, wherein: The lower part of the support extends inward to form a support seat, which supports the bottom end face of the piston.

5. The piston finish machining fixture of claim 4, wherein: A buffer gap is provided between the backrest and the backrest surface.

6. The piston precision grinding tooling fixture according to any one of claims 1-5, characterized in that: A guide ramp is provided on the upper part of the support surface.

Images