A guide post end spherical surface fixing structure

Abstract

The utility model discloses a kind of fixed structures of guide column end spherical surface, belong to forging and pressing mechanical technical field.The structure includes body frame, guide column and spherical surface fixed assembly.The spherical surface fixed assembly is arranged in guide column lower end, including joint bearing, bearing fixed pressure ring and pressure ring fixed bottom plate.Pressure ring fixed bottom plate is fixed in the lower part of body frame, bearing fixed pressure ring is fixed on it, the outer spherical surface of joint bearing cooperates with pressure ring inner wall, inner hole is fixed with guide column lower end.The utility model realizes the constraint of two ends of guide column by spherical surface fixed assembly, its guiding precision is equivalent with the traditional two end hole cooperation structure, but ingeniously avoids the problem of machining deep precise hole on body frame, compensates installation error using the self-adapting alignment ability of joint bearing.The structure has the advantages of high precision, good rigidity, simple and convenient processing and manufacturing, low cost, especially suitable for powder metallurgy hydraulic press and other high-precision pressure forming equipment.

Description

Technical Field

[0001] This utility model relates to the field of forging and pressing machinery technology, specifically to the guide structure of a hydraulic press for pressure forming of powder metallurgy parts. Background Technology

[0002] In powder metallurgy pressure forming hydraulic presses, the precise guidance of the guide column to the slider is crucial for ensuring equipment accuracy and product yield. Common guide column structures include... Figure 1 As shown, the upper end of the guide post mates with the frame, while the lower end is suspended due to the compact frame structure and the difficulty of machining deep holes, forming a cantilever beam structure. A certain type of hydraulic press uses a welded frame, and the slide block is constrained by a guide post with a diameter d of 50mm during its up-and-down movement. Because the frame structure is relatively compact, for ease of machining, the guide post mating holes are only machined on the upper two layers of the frame; the area near the lower end of the guide post inside the frame is not machined due to the difficulty of machining small, deep holes. Figure 1 A rough analysis of the guiding effect shows that the lower end of the guide post does not engage with the fuselage frame and is suspended in mid-air, with a suspension length of approximately 870mm. The lowest point is also the position where the guiding constraint effect of this structure is the worst.

[0003] Assume the horizontal lateral disturbance force P is 100N, the guide column is made of carbon steel, and its modulus E is 200GPa.

[0004] The moment of inertia of the guide column section is I x = (3.14 * d 4 ) / 64 = 306641mm 4 ; The deformation deflection of the guide column can be calculated using a cantilever beam calculation model to be approximately (PL). 3 ) / (3EI x = 358um. Under lateral force, the deformation deflection at the bottom of the guide post of this structure can reach 358 micrometers, resulting in poor guiding accuracy and seriously affecting the performance of the equipment.

[0005] To improve accuracy, existing technologies employ methods such as... Figure 2 The shown end-constraint structure refers to the hole machined inside the fuselage frame to mate with the lower end of the guide post. To improve guiding accuracy, the mechanical manufacturing partners worked on a breakthrough, machining a hole inside the fuselage frame to mate with the outer circle of the lower end of the guide post, as shown... Figure 2 As shown.

[0006] Assuming the horizontal lateral disturbance force is 100N, the guide column is made of carbon steel with a modulus of 200GPa, and the maximum deformation of the guide column is located in the middle between the two plates inside the fuselage frame, 482.5mm away from both the upper and lower plates.

[0007] Using the calculation model of the beam with two restraints at both ends, the deformation deflection of the guide column is calculated to be approximately (PL). 3 ) / (48EI x = 30.5um. Although this structure significantly reduces the deformation deflection to about 30.5 micrometers, the deep, fine mating holes inside the frame are extremely difficult to machine, requiring specialized tooling. Furthermore, rework is difficult after machining errors, resulting in high manufacturing costs and risks.

[0008] Therefore, there is an urgent need in this field for a guide post fixing structure that can effectively constrain both ends of the guide post to ensure guiding accuracy, while avoiding the need for precision machining of deep holes. Utility Model Content

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide a spherical fixing structure for the end of a guide post. This structure not only ensures high guiding accuracy but also solves the problem of deep hole machining, and has self-adjusting capability, while being inexpensive.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: A spherical fixing structure for a guide post includes a fuselage frame, a guide post, and a mating hole on the guide post disposed on the upper plate of the fuselage frame. The key feature is that a spherical fixing assembly is provided at the lower end of the guide post; the spherical fixing assembly includes a spherical bearing, a bearing fixing ring, and a ring fixing base plate. The pressure ring fixing base plate is fixedly installed on the lower support surface inside the machine frame; the bearing fixing pressure ring is fixed to the pressure ring fixing base plate by fasteners; the outer spherical surface of the spherical bearing is fitted with the inner wall of the bearing fixing pressure ring, and its inner hole is interference-fitted or fixedly connected with the lower outer circle of the guide post.

[0011] Preferably, the pressure ring fixing base plate is fixed to the lower support surface inside the body frame by welding, and the threaded holes on the pressure ring fixing base plate have been pre-processed before welding.

[0012] Preferably, the spherical bearing is a standard part.

[0013] Preferably, the upper end of the guide post and the mating hole on the guide post are in a precision clearance fit.

[0014] The beneficial effects of this utility model are as follows: High precision and high rigidity: The spherical fixing component at the lower end and the mating hole at the upper end together form a constraint on both ends of the guide post, greatly improving the rigidity of the guiding system. Its deformation deflection is comparable to that of traditional two-end constraint structures ( Figure 2 Comparable to, and far superior to, cantilever beam structures. Figure 1 This ensures the guiding accuracy of the equipment.

[0015] Avoiding complex machining: By using pre-machined pressure rings to fix the base plate and standard spherical bearings, the problem of directly machining deep, fine, and precise mating holes on the fuselage frame is completely avoided, significantly reducing machining difficulty, manufacturing costs, and rework risks.

[0016] Self-aligning: The spherical fit structure of the spherical bearing can adaptively compensate for the perpendicularity error between the flat surface of the frame plate and the guide column caused by welding or processing, eliminating assembly stress, making the guide column move more smoothly, and extending its service life.

[0017] Simple structure and low cost: The entire structure has few components, is easy to assemble, and the spherical bearings used are standard parts, which are inexpensive and easy to promote and implement. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the suspended structure at the lower end of the guide column as described in the background art.

[0019] Figure 2 This is a schematic diagram of the structure described in the background art, where the guide post is constrained at both ends but requires deep machining.

[0020] Figure 3 This is an overall schematic diagram of the guide post end spherical fixing structure described in this utility model.

[0021] Figure 4 This is a partial enlarged view of the spherical fixing component in this utility model. Detailed Implementation

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

[0023] like Figure 3 and Figure 4 As shown, the present invention provides a guide column end spherical fixing structure, which mainly includes a fuselage frame 1, a guide column 2 and a spherical fixing component 3.

[0024] The upper plate of the fuselage frame 1 is machined with a guide post mating hole 11. The upper end of the guide post 2 passes through the hole 11 and is clearance-fitted with it.

[0025] The spherical fixing assembly 3 is located at the lower end of the guide post 2. This assembly includes a pressure ring fixing base plate 31, a bearing fixing pressure ring 32, and a spherical bearing 33. The pressure ring fixing base plate 31 has pre-machined threaded holes before assembly and is then fixed to the lower support surface inside the frame 1 by welding. The spherical bearing 33 is a standard spherical bearing, and its inner hole is fixed to the lower end of the guide post 2 by interference fit or key connection. Subsequently, the lower end of the guide post 2, with the spherical bearing 33 installed, is placed into the bearing fixing pressure ring 32, and the outer spherical surface of the spherical bearing 33 forms a spherical fit with the inner wall of the bearing fixing pressure ring 32. Finally, bolts or other fasteners 34 are used to fasten the bearing fixing pressure ring 32 to the pressure ring fixing base plate 31, thereby completing the fixing of the entire lower end of the guide post.

[0026] During operation, as the slider 5 moves up and down along the guide post 2, the lower end of the guide post is effectively constrained to the pressure ring fixing base plate 31 by the spherical fixing component 3, forming a reliable lower end support. When there is a slight verticality error in the upper plate plane of the fuselage frame 1, the spherical fit of the spherical bearing 33 allows the guide post 2 to make a slight adaptive sway, ensuring that no jamming occurs, while maintaining extremely high guiding rigidity.

Claims

1. A spherical fixing structure for a guide post end, comprising a fuselage frame (1), a guide post (2), and a mating hole (11) on the guide post disposed on the upper plate of the fuselage frame (1), characterized in that: A spherical fixing component (3) is provided at the lower end of the guide post (2); The spherical fixing assembly (3) includes a spherical bearing (33), a bearing fixing ring (32), and a ring fixing base plate (31). The pressure ring fixing base plate (31) is fixedly installed on the lower support surface inside the body frame (1); The bearing retaining ring (32) is fixed on the retaining ring base plate (31); The outer spherical surface of the spherical bearing (33) mates with the inner spherical surface of the bearing fixing ring (32), and its inner hole is fixedly connected to the lower outer circle of the guide post (2).

2. The guide post end spherical fixing structure according to claim 1, characterized in that: The pressure ring fixing base plate (31) is fixed to the lower support surface inside the fuselage frame (1) by welding.

3. A guide post end spherical fixing structure according to claim 1 or 2, characterized in that: The pressure ring fixing base plate (31) is provided with threaded holes for fixing the bearing fixing pressure ring (32). The threaded holes are processed before the pressure ring fixing base plate (31) is welded to the machine frame (1).

4. The guide post end spherical fixing structure according to claim 1, characterized in that: The spherical bearing (33) is a standard part.

5. The guide post end spherical fixing structure according to claim 1, characterized in that: The upper end of the guide post (2) and the mating hole (11) on the guide post are in a precision clearance fit.

6. The guide post end spherical fixing structure according to claim 1, characterized in that: The inner hole of the spherical bearing (33) is fixedly connected to the lower outer circle of the guide post (2) by an interference fit.

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