Honing clamp for cylinder hole composite coating of engine cylinder body

Abstract

The utility model relates to a honing clamp for a cylinder hole composite coating of an engine cylinder block, and belongs to the technical field of machining clamps. The utility model provides a honing clamp for a cylinder hole composite coating of an engine cylinder block, which aims at solving the problems of port damage, non-uniform hole wall and insufficient roundness caused by difficult alignment of the central axis of a grinding knife and the central axis of a cylinder hole during honing in the prior art. Comprising a mounting base, inserting rods symmetrically inserted into the mounting base, mounting blocks sleeving the inserting rods, large / small floating rings and a pressing mechanism. The large floating ring is rotationally connected with the mounting block through a transverse shaft, the small floating ring is in floating connection with the large floating ring through a vertical shaft, and the compression spring ensures that the central axes of the two rings are consistent; the pressing mechanism presses the cylinder body through an adjusting plate, a screw rod and a rubber pressing block with a buffering air bag, so that a cylinder hole is aligned with an inner hole of the small floating ring. And during honing, the grinding cutter is automatically aligned with the center shaft of the cylinder hole, so that the machining precision is effectively improved. The honing device is compact in structure, high in alignment precision and capable of being widely applied to honing machining of the composite coating of the engine cylinder block.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing fixtures, and specifically relates to a fixture used for honing composite coatings of engine cylinder bores, and is particularly suitable for scenarios requiring high-precision alignment of the honing tool and the center axis of the cylinder bore. Background Art

[0002] During the composite coating process of the cylinder bore of an engine block, the inner wall of the cylinder bore needs to be honed to ensure the coating accuracy. The traditional honing method is to clamp the cylinder block on a lathe and use a grinding tool to perform internal honing on the inner wall of the cylinder bore. However, the existing technology has the following drawbacks:

[0003] 1. It is difficult to accurately align the center axis of the honing tool with the center axis of the cylinder hole, which makes it easy to damage the cylinder hole port when the honing tool is inserted;

[0004] 2. The hole wall honing is uneven and the cylinder hole roundness cannot meet the design requirements.

[0005] The root cause of the above problems lies in the lack of a dedicated fixture that can adaptively adjust the cylinder body position and ensure that the cylinder bore is aligned with the center axis of the honing tool. Therefore, it is urgent to design a honing fixture with a reasonable structure and high alignment accuracy to address the shortcomings of the existing technology. Utility Model Content

[0006] The purpose of the utility model is to provide a composite coating honing fixture for an engine cylinder block and cylinder bore, which realizes automatic alignment of the cylinder block and cylinder bore with the center axis of the honing cutter through the cooperation of a floating adjustment mechanism and a clamping mechanism, thereby avoiding damage to the port and improving the uniformity and roundness of the hole wall.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a composite coating honing fixture for an engine cylinder block bore, comprising:

[0008] 1. Mounting seat: As the basic support, it has socket holes on both sides;

[0009] 2. Insertion rods: two, inserted into the insertion holes on both sides of the mounting base, and can be moved or fixed along the axial direction of the insertion hole;

[0010] 3. Mounting blocks: two, respectively sleeved on the two plug rods, can slide along the length of the plug rods;

[0011] 4. Large floating ring: It is set between the two mounting blocks. The left and right ends of the outer wall are fixedly connected to a horizontal axis. The other end of the horizontal axis is inserted into the slot opened on the mounting block. The horizontal axis can rotate around its own axis in the slot.

[0012] 5. Small floating ring: coaxially arranged in the inner hole of the large floating ring, with the upper and lower ends fixedly connected to the vertical shaft respectively. The other end of the vertical shaft passes through the peripheral wall of the large floating ring and is fixedly connected to the limit cap;

[0013] 6. Compression springs: Four springs, respectively mounted on the two vertical axes and two horizontal axes between the small floating ring and the large floating ring, to provide elastic buffering and ensure that the central axis of the small floating ring is consistent with the central axis of the large floating ring;

[0014] 7. Clamping mechanism: includes an adjustment plate, a tightening screw, a screw, a rubber pressure block and a handwheel; the adjustment plate is movably sleeved on the two plug rods and fixedly connected to the plug rods by a tightening screw; the screw is screwed to the adjustment plate, one end of which is fixedly connected to the rubber pressure block, and the other end is fixedly connected to the handwheel; the rubber pressure block has a built-in buffer airbag cavity for increasing the uniformity of the clamping force.

[0015] Furthermore, the mounting seat is a rectangular block structure, and the plug-in hole is a stepped hole, which cooperates with the stepped shaft structure of the insertion rod to limit the radial movement of the insertion rod.

[0016] Furthermore, the large floating ring and the small floating ring are both annular structures, and the inner hole diameter of the small floating ring is adapted to the diameter of the engine cylinder hole, with an error of ≤0.05mm.

[0017] Furthermore, the horizontal axis is clearance-matched with the slot of the mounting block, and the clearance is 0.1-0.2 mm, ensuring that the large floating ring can rotate around the horizontal axis at a small angle.

[0018] Furthermore, the vertical axis is clearance-matched with the peripheral wall through-hole of the large floating ring, and the clearance is 0.12-0.18 mm, ensuring that the small floating ring can float up and down along the vertical axis.

[0019] Furthermore, the buffer airbag cavity is an annular chamber inside the rubber pressing block, which is in flexible contact with the surface of the cylinder body after inflation to avoid rigid compression.

[0020] The beneficial effects of the utility model are:

[0021] 1. Automatic alignment of the central axis: Through the floating adjustment of the large and small floating rings (horizontal axis rotation + vertical axis up and down floating) and the elastic buffering of the compression spring, the inner hole of the small floating ring is made coaxial with the cylinder hole. When the honing tool is inserted, it is automatically aligned with the central axis of the cylinder hole to avoid port damage;

[0022] 2. Uniform honing of the hole wall: The floating mechanism compensates for the slight position deviation between the cylinder body and the fixture, ensuring the consistent honing amount of each area of the hole wall and improving the roundness;

[0023] 3. Reliable clamping: The rubber clamping block of the clamping mechanism cooperates with the buffer airbag cavity to provide uniform radial clamping force to prevent the cylinder body and the small floating ring from separating during the honing process;

[0024] 4. Compact structure: All components are connected through shaft-hole fit and springs, occupying little space and easy to install on the honing machine.

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of a specific embodiment of the utility model;

[0027] Figure 2 It is a partial stereogram of a specific embodiment of the utility model.

[0028] Wherein, description of the accompanying drawings:

[0029] 1-mounting seat; 2-insertion rod; 3-mounting block; 4-large floating ring; 5-small floating ring; 6-horizontal axis; 7-vertical axis; 9-adjustment plate; 11-screw; 12-rubber pressure block; 13-handwheel; 15-slot; 16-limiting cap; 20-cylinder body; 30-honing knife. DETAILED DESCRIPTION

[0030] The present invention is described in detail below through examples, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0031] like Figure 1 、 Figure 2 The figure shows a fixture for honing engine cylinder bores with composite coatings. The mounting base 1 is a rectangular block with symmetrically stepped insertion holes (not shown) on its left and right sides. Two insertion rods 2, each with a stepped shaft structure, fit into the insertion holes and are secured to the mounting base 1 with locking screws (not shown).

[0032] The two mounting blocks 3 are respectively sleeved on the two insertion rods 2 and can slide along the length direction of the insertion rod 2 (for example, anti-slip grooves are provided on the outer wall of the insertion rod 2, or the inner hole of the mounting block 3 and the insertion rod 2 have an interference fit of 0.02~0.05mm to ensure that there is no looseness during sliding).

[0033] The large floating ring 4 is placed horizontally between the two mounting blocks 3. A transverse axis 6 is welded to each end of its outer wall. The other end of the transverse axis 6 is inserted into a slot 15 in the mounting blocks 3 (slot 15 is a horizontal slot, 2-3 times the diameter of the transverse axis 6). A clearance between the transverse axis 6 and slot 15 (0.1-0.2mm) allows the large floating ring 4 to rotate slightly left or right around the transverse axis 6 (rotation angle ≤±2°).

[0034] Small floating ring 5 is coaxially positioned within the inner bore of large floating ring 4 (the diameter of the small floating ring 5's inner bore is 0.1-0.2mm smaller than the cylinder bore for positioning purposes). A vertical shaft 7 is welded to each of its upper and lower ends. Vertical shaft 7 extends downward through a through-hole in the wall of large floating ring 4 (the diameter of the through-hole is 0.12-0.18mm larger than that of vertical shaft 7). The ends of vertical shaft 7 are secured by stop caps 16, which are threadedly connected to vertical shaft 7. A compression spring (with its natural length 1-2mm greater than the mounting spacing) is mounted on each of the vertical shaft 7 and transverse shaft 6 between the small and large floating rings 5 and 4. This spring provides an upward force, ensuring that the small floating ring 5 always tends to conform to the cylinder body while allowing it to float up and down with slight fluctuations in the cylinder surface (floating travel ≤2mm).

[0035] The clamping mechanism is located above mounting base 1: an adjustment plate 9 flexibly slots onto two rods 2 (the slotting position is located above mounting block 3) and is fixed to the rods 2 via two tensioning screws (the tensioning screws are screwed into adjustment plate 9 and press against the surface of the rods 2). Screw 11 is threaded into the center screw hole of adjustment plate 9, with a handwheel 13 welded to its upper end and a rubber pressure block 12 fixedly connected to its lower end. Rubber pressure block 12 is an arc-shaped structure (the curvature matches the upper surface of the cylinder body) with a built-in cushioning air chamber (which can be filled with 0.3-0.5MPa compressed air through an air nozzle) to cushion the clamping force and prevent damage to the cylinder body surface.

[0036] Working principle:

[0037] 1. Install the cylinder block: Place the engine cylinder block 20 on top of the small floating ring 5, making sure the cylinder bore is coaxial with the inner hole of the small floating ring 5;

[0038] 2. Adjust the clamping mechanism: Rotate handwheel 13 to drive screw 11 downward, causing rubber clamp 12 to contact the upper surface of cylinder 20. Continue rotating handwheel 13 to compress the compression spring. Rubber clamp 12 evenly presses the cylinder through the cushioning airbag cavity, ensuring a tight fit between the cylinder and small floating ring 5.

[0039] 3. Floating adjustment: If the cylinder body 20 is slightly tilted or offset, the large floating ring 4 rotates around the mounting block 3 via the horizontal axis 6, and the small floating ring 5 floats up and down via the vertical axis 7. The compression spring automatically compensates for the deviation, ensuring that the cylinder bore and the inner hole of the small floating ring 5 are always coaxial;

[0040] 4. Honing process: Insert the honing tool 30 into the inner hole of the small floating ring 5 (the gap between the honing tool diameter and the inner hole of the small floating ring 5 is ≤ 0.03mm). Since the cylinder hole and the inner hole of the small floating ring 5 are coaxial, the honing tool and the center axis of the cylinder hole are automatically aligned. Start the honing machine to complete high-precision processing.

Claims

1. A composite coating honing fixture for engine cylinder bore, characterized in that: include: The mounting base (1) has plug holes on both symmetrical sides; Two insertion rods (2) are respectively inserted into the insertion holes on both sides of the mounting base (1); Two mounting blocks (3) are respectively sleeved on the two insertion rods (2); A large floating ring (4) is arranged between the two mounting blocks (3), and the left and right ends of its outer wall are respectively fixedly connected to a transverse shaft (6), and the other end of the transverse shaft (6) is inserted into a slot (15) provided on the mounting block (3) and can rotate around its own axis; A small floating ring (5) is coaxially placed in the inner hole of the large floating ring (4), and its upper and lower ends are respectively fixedly connected to vertical shafts (7), and the other end of the vertical shaft (7) passes through the peripheral wall of the large floating ring (4) and is fixedly connected to a limiting cap (16); Four compression springs are respectively mounted on the vertical axis (7) and the horizontal axis (6) between the small floating ring (5) and the large floating ring (4); The clamping mechanism is adjustably fixed on the insertion rod (2) and forms a clamping structure with the small floating ring (5).

2. The engine cylinder block cylinder bore composite coating honing fixture according to claim 1, characterized in that: The clamping mechanism comprises an adjusting plate (9), a tightening screw, a screw (11), a rubber pressing block (12) and a hand wheel (13); the adjusting plate (9) is movably sleeved on the two inserting rods (2) and fixed by the tightening screw; the screw (11) is screwed onto the adjusting plate (9), one end of which is fixedly connected to the rubber pressing block (12) and the other end of which is fixedly connected to the hand wheel (13); the rubber pressing block (12) has a built-in buffer airbag cavity.

3. The engine cylinder block cylinder bore composite coating honing fixture according to claim 1, characterized in that: The mounting seat (1) is a rectangular block structure, and the insertion hole is a stepped hole, which cooperates with the stepped shaft structure of the insertion rod (2).

4. The engine cylinder block cylinder bore composite coating honing fixture according to claim 1, characterized in that: The large floating ring (4) and the small floating ring (5) are both annular structures, and the inner hole diameter of the small floating ring (5) is adapted to the diameter of the engine cylinder hole.

5. The engine cylinder block cylinder bore composite coating honing fixture according to claim 1, characterized in that: The horizontal axis (6) and the slot (15) of the mounting block (3) are clearance-matched, and the clearance is 0.1-0.2 mm.

6. The engine cylinder block cylinder bore composite coating honing fixture according to claim 2, characterized in that: The buffer airbag cavity is an annular cavity inside the rubber pressing block (12) and is used for flexible contact with the surface of the cylinder body.

7. The engine cylinder block cylinder bore composite coating honing fixture according to claim 1, characterized in that: The vertical shaft (7) is fitted with a clearance between the peripheral wall through hole of the large floating ring (4), and the clearance is 0.12mm-0.18mm.

Images