Lubricating type seamless sleeve and machining device

Abstract

The utility model discloses a lubrication type seamless sleeve and a processing device, the lubrication type seamless sleeve comprises a sleeve body (1), the middle part of the sleeve body (1) is provided with a round hole, a plurality of blind grooves (2) formed by stamping are annularly distributed on the periphery of the inner wall of the round hole, the blind grooves (2) are strip-shaped, the section curve of each blind groove (2) is formed by connecting a first circular arc line (3) and a second circular arc line (4), and the first circular arc line (3) is connected with the second circular arc line (4). The second arc lines (4) are symmetrically arranged on the two sides of the first arc line (3) and smoothly connected with the first arc line (3), the groove width of the blind groove (2) is gradually increased from inside to outside in the depth direction, connecting arc faces (5) are formed between the two ends of the blind groove (2) and the inner wall of the barrel body (1), and gaps are reserved between the connecting arc faces (5) and the end faces of the barrel body (1). According to the utility model, the blind slot in the seamless sleeve can be directly punched and formed, so that the processing cost is reduced, and the processing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a seamless sleeve and a processing device thereof, in particular to a lubricating seamless sleeve and a processing device thereof. Background Art

[0002] Since the seamless sleeves in conventional piston pins, chains and other components will experience excessive wear after long-term use, manufacturers will add oil storage tanks on the inside of the seamless sleeves to increase the service life of the seamless sleeves. After the seamless sleeve and the inner pin shaft are connected, the lubricating oil filled in the oil storage tank is used to lubricate the connection part, thereby increasing the service life of the seamless sleeve.

[0003] However, the defect of this structure is that the existing seamless sleeve is generally directly stamped by a stamping die to reduce its processing cost; but since the oil storage tank needs to form a blind groove structure and is hidden in the middle of the inner wall of the seamless sleeve, it is difficult to directly open a blind groove on the inner wall of the seamless sleeve by stamping. As a result, manufacturers currently need to first stamp the seamless sleeve by stamping equipment during production, and then take the seamless sleeve out and slot it with a specific slotting equipment, which greatly increases the processing cost of the seamless sleeve and reduces its processing efficiency.

[0004] In addition, after the existing grooving equipment opens a blind groove in the inner hole of the seamless sleeve, an acute angle structure will be formed at the connection between the blind groove and the inner wall of the seamless sleeve, which on the one hand reduces the structural strength of the seamless sleeve, and on the other hand, when the pin shaft and the seamless sleeve form relative movement, the acute angle is also likely to cause scratches on the surface of the pin shaft, thereby reducing its connection stability.

[0005] Therefore, the existing processing method for the seamless sleeve with the oil storage groove has the problems of high processing cost and low processing efficiency. Utility Model Content

[0006] The utility model aims to provide a lubricating seamless sleeve and a processing device, which can realize direct stamping and forming of the blind groove in the seamless sleeve, thereby reducing the processing cost and improving the processing efficiency.

[0007] The technical solution of the utility model is as follows: a lubricating seamless sleeve comprises a cylinder body, a circular hole is arranged in the middle of the cylinder body, a plurality of blind grooves formed by stamping are distributed in a ring shape around the inner wall of the circular hole, the blind groove is in the shape of an elongated strip, a cross-sectional curve of the blind groove is formed by connecting a first circular arc line and a second circular arc line, the second circular arc line is symmetrically arranged on both sides of the first circular arc line and smoothly connected to the first circular arc line, the groove width of the blind groove gradually increases from the inside to the outside along the depth direction, a connecting arc surface is formed between the two ends of the blind groove and the inner wall of the cylinder, and a gap is left between the connecting arc surface and the end face of the cylinder body.

[0008] A processing device based on the aforementioned lubricating seamless sleeve includes a mold frame and a front punch, a positioning sleeve is buckled and connected inside the mold frame, a rear punch is arranged on the inner side of the positioning sleeve, the rear punch and the positioning sleeve are nested inside and outside and coaxially arranged, an extrusion ring is formed at the end of the rear punch, a plurality of through grooves are distributed in an annular shape around the extrusion ring, an extrusion rod is formed between adjacent through grooves, a first guide portion is arranged on the inner side of the end of the extrusion rod, and an extrusion portion is arranged on the outer side of the end of the extrusion rod; the front punch is connected to the outside of the front punch sleeve, the end of the front punch extends to the outside of the punch sleeve and is provided with a second guide portion matching the first guide portion;

[0009] The front punch sleeve is used to axially limit the seamless sleeve;

[0010] The second guide portion is used to limit the radial position of the extrusion rod, so that the extrusion rod is radially expanded outward by the extrusion of the first guide portion and the second guide portion after being ejected;

[0011] The extrusion portion is used to groove the inner wall of the seamless sleeve after the extrusion rod is opened.

[0012] In the aforementioned processing device, an ejector rod is connected between the back punch and the positioning sleeve.

[0013] In the aforementioned processing device, a push plate is slidably connected inside the mold frame, a compression spring located inside the mold frame is provided between the push plate and the positioning sleeve, and the end of the ejector rod and the push plate are in contact with each other.

[0014] The aforementioned processing device also includes a fixture for clamping and limiting the outer wall of the seamless sleeve. After being clamped by the fixture, the seamless sleeve remains coaxial with the front punch rod and the rear punch rod.

[0015] In the aforementioned processing device, the front and rear ends of the extrusion portion are smoothly connected to the outer wall of the extrusion rod via an arc surface.

[0016] In the aforementioned processing device, the front and rear ends of the first guide portion are connected to the inner wall of the extrusion rod via an inclined surface, and the end of the second guide portion is provided with a tapered surface matching the first guide portion.

[0017] Compared with the prior art, the utility model has the following characteristics:

[0018] (1) The utility model can improve the structural strength of the seamless sleeve after the blind groove is formed by limiting the structure of the blind groove, and prevent the sharp parts around the blind groove from scratching the inner pin shaft; on the other hand, it can also improve the lubrication effect of the blind groove, so that the lubricating oil in the blind groove can flow out more easily and be coated on the surface of the pin shaft;

[0019] (2) On the basis of the above-mentioned seamless sleeve, the utility model further defines a corresponding processing device, through the structural coordination of the front punch, the rear punch and the positioning sleeve, so that the extrusion rod at the end of the rear punch can be guided by the front punch to open outward during the ejection process, and a blind groove is set on the inner wall of the seamless sleeve, thereby realizing the stamping forming of the blind groove structure, and enabling it to be used in combination with the existing stamping equipment for seamless sleeves, effectively reducing the processing cost of the seamless sleeve and improving its processing efficiency;

[0020] (3) By optimizing the connection and limiting structure of the front punch, the rear punch and the positioning sleeve, the processing accuracy and stability of the blind groove can be guaranteed during the stamping process, thereby improving the processing effect of the seamless sleeve;

[0021] Therefore, the utility model can realize direct stamping forming of the blind groove in the seamless sleeve, thereby reducing its processing cost and improving its processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a lubricating seamless sleeve;

[0023] Figure 2 It is a cross-sectional view of a blind groove;

[0024] Figure 3 It is a schematic diagram of the structure of the processing device in the initial state;

[0025] Figure 4 yes Figure 3 A-direction enlarged view;

[0026] Figure 5 It is a top view of the back punch;

[0027] Figure 6 It is a structural schematic diagram of the processing device during the stamping process.

[0028] The marks in the accompanying drawings are: 1-cylinder, 2-blind groove, 3-first arc line, 4-second arc line, 5-connecting arc surface, 6-mold frame, 7-front punch rod, 8-positioning sleeve, 9-rear punch rod, 10-extrusion ring, 11-through groove, 12-extrusion rod, 13-first guide part, 14-extrusion part, 15-front punch rod sleeve, 16-second guide part, 17-ejection rod, 18-push plate, 19-compression spring, 20-clamp. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0030] Embodiment. A lubricating seamless sleeve is constructed as follows Figure 1As shown, it includes a cylinder 1, a circular hole is provided in the middle of the cylinder 1, and a plurality of blind grooves 2 formed by stamping are distributed in a ring shape around the inner wall of the circular hole. The blind groove 2 is in a long strip shape, and the cross-sectional curve of the blind groove 2 is formed by connecting a first arc line 3 and a second arc line 4. The second arc line 4 is symmetrically arranged on both sides of the first arc line 3 and smoothly connected to the first arc line 3. The groove width of the blind groove 2 gradually increases from the inside to the outside along the depth direction, and a connecting arc surface 5 is formed between the two ends of the blind groove 2 and the inner wall of the cylinder 1, and a gap is left between the connecting arc surface 5 and the end face of the cylinder 1.

[0031] The processing device used for the lubricating seamless sleeve includes a mold frame 6 and a front punch 7. A positioning sleeve 8 is buckled and connected inside the mold frame 6. A rear punch 9 fixed inside the mold frame 6 is provided on the inner side of the positioning sleeve 8. The rear punch 9 and the positioning sleeve 8 are nested inside and outside and coaxially arranged. A hollow extrusion ring 10 is formed at the end of the rear punch 9. A plurality of through grooves 11 are distributed in an annular manner around the extrusion ring 10. Extrusion rods 12 are formed between adjacent through grooves 11. The number of extrusion rods 12 is consistent with the number of blind grooves 2 in the seamless sleeve. A first guide portion 13 is provided on the inner side of the end of the extrusion rod 12, and an extrusion portion 14 is provided on the outer side of the end of the extrusion rod 12. The front punch 7 is connected to the outside of the front punch sleeve 15, and the outside of the front punch sleeve 15 is connected to a driving telescopic mechanism. The end of the front punch 7 extends to the outside of the punch sleeve and is provided with a second guide portion 16 that matches the first guide portion 13.

[0032] The front punch sleeve 15 is used to axially limit the seamless sleeve;

[0033] The second guide portion 16 is used to limit the radial position of the extrusion rod 12, so that the extrusion rod 12 is radially expanded outward by the extrusion of the first guide portion 13 and the second guide portion 16 after being ejected;

[0034] The extrusion portion 14 is used to groove the inner wall of the seamless sleeve after the extrusion rod 12 is opened.

[0035] An ejector rod 17 is connected between the rear punch 9 and the positioning sleeve 8, the inner wall of the ejector rod 17 and the outer wall of the rear punch 9 fit together, and the outer wall of the ejector rod 17 and the inner wall of the positioning sleeve 8 fit together; the ejector rod 17 is used to limit the end of the seamless sleeve when it is punched and grooved, and to eject it after the seamless sleeve is punched.

[0036] A push plate 18 is slidably connected inside the mold frame 6, and a compression spring 19 located inside the mold frame 6 is provided between the push plate 18 and the positioning sleeve 8. The end of the ejector rod 17 and the push plate 18 fit each other, and the outside of the push plate 18 is connected to a driving rod.

[0037] It also includes a clamp 20 for clamping and limiting the outer wall of the seamless sleeve. The clamp 20 is an existing stamping clamp for seamless sleeves. After being clamped by the clamp 20, the seamless sleeve is coaxially arranged with the front punch 7 and the rear punch 9; when the seamless sleeve is in a stamping state, the clamp 20 is slightly loosened to allow the seamless sleeve to slide axially along the clamp 20.

[0038] The front and rear ends of the extrusion portion 14 are smoothly connected to the outer wall of the extrusion rod 12 via arc surfaces.

[0039] The front and rear ends of the first guide portion 13 are connected to the inner wall of the extrusion rod 12 via an inclined surface, and the end of the second guide portion 16 is provided with a tapered surface matching the first guide portion 13 .

[0040] Working principle of the utility model: When the utility model is working, the fixture 20 first moves the seamless sleeve to between the front punch 7 and the rear punch 9, and then the front punch 7 and the front punch sleeve 15 are driven by the external driving member to move axially toward the mold frame 6 at the same time, and then the seamless sleeve is pushed into the positioning sleeve 8. During the movement of the front punch 7, the extrusion ring 10 extends to the gap between the seamless sleeve and the second guide part 16, and is blocked by the second guide part 16 and opens outward, so that the extrusion part 14 squeezes the inner wall of the seamless sleeve after opening, achieving a grooving effect. When the seamless sleeve moves to contact the ejector rod 17, the extrusion part 14 completes the grooving action, and then the front punch 7 and the front punch sleeve 15 shrink and reset at the same time, and the seamless sleeve is still in the positioning sleeve 8 under the obstruction of the extrusion part 14. After the front punch rod 7 and the front punch rod sleeve 15 are completely reset, the push plate 18 drives the ejector rod 17 to be ejected outward under the action of the external driving member, so that the seamless sleeve is disengaged from the extrusion ring 10 and slides out, and re-enters the clamp 20, completing the stamping and grooving action of the seamless sleeve.

Claims

1. Lubricating seamless sleeve, characterized by: The invention comprises a cylinder (1), wherein a circular hole is provided in the middle of the cylinder (1), and a plurality of blind grooves (2) formed by stamping are distributed in a circular shape around the inner wall of the circular hole, wherein the blind groove (2) is in the shape of an elongated strip, and the cross-sectional curve of the blind groove (2) is formed by connecting a first circular arc line (3) and a second circular arc line (4), wherein the second circular arc line (4) is symmetrically arranged on both sides of the first circular arc line (3) and smoothly connected to the first circular arc line (3), and the groove width of the blind groove (2) gradually increases from the inside to the outside along the depth direction, and connecting arc surfaces (5) are formed between the two ends of the blind groove (2) and the inner wall of the cylinder (1), and a gap is left between the connecting arc surface (5) and the end surface of the cylinder (1).

2. A processing device, characterized in that: The processing device is used to process the lubricating seamless sleeve in claim 1, and the processing device comprises a mold frame (6) and a front punch (7), a positioning sleeve (8) is buckled and connected inside the mold frame (6), a rear punch (9) is arranged on the inner side of the positioning sleeve (8), the rear punch (9) and the positioning sleeve (8) are nested inside and outside and coaxially arranged, an extrusion ring (10) is formed at the end of the rear punch (9), a plurality of through grooves (11) are distributed in an annular manner around the extrusion ring (10), an extrusion rod (12) is formed between adjacent through grooves (11), a first guide portion (13) is arranged on the inner side of the end of the extrusion rod (12), and an extrusion portion (14) is arranged on the outer side of the end of the extrusion rod (12); the front punch (7) is connected to the outside with a front punch sleeve (15), the end of the front punch (7) extends to the outside of the punch sleeve and is provided with a second guide portion (16) matching the first guide portion (13); The front punch sleeve (15) is used to axially limit the seamless sleeve; The second guide portion (16) is used to limit the radial position of the extrusion rod (12), so that the extrusion rod (12) is radially expanded outwards by being squeezed by the first guide portion (13) and the second guide portion (16) after being ejected; The extrusion portion (14) is used to groove the inner wall of the seamless sleeve after the extrusion rod (12) is opened.

3. The processing device according to claim 2, characterized in that: An ejector rod (17) is connected between the rear punch rod (9) and the positioning sleeve (8).

4. The processing device according to claim 3, characterized in that: A push plate (18) is slidably connected inside the mold frame (6), a compression spring (19) located inside the mold frame (6) is provided between the push plate (18) and the positioning sleeve (8), and the end of the ejector rod (17) and the push plate (18) are in contact with each other.

5. The processing device according to claim 2, characterized in that: It also includes a clamp (20) for clamping and limiting the outer wall of the seamless sleeve. After the seamless sleeve is clamped by the clamp (20), it is coaxially arranged with the front punch rod (7) and the rear punch rod (9).

6. The processing device according to claim 2, characterized in that: The front and rear ends of the extrusion portion (14) are smoothly connected to the outer wall of the extrusion rod (12) via an arc surface.

7. The processing device according to claim 2, characterized in that: The front and rear ends of the first guide portion (13) are connected to the inner wall of the extrusion rod (12) via an inclined surface, and the end of the second guide portion (16) is provided with a tapered surface matching the first guide portion (13).

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