CN106112255A - A kind of large-scale part friction welding fixture - Google Patents

Abstract

The invention discloses a kind of large-scale part friction welding fixture, main shaft including hollow, one end of main shaft is provided with oil cylinder, the other end jockey body of main shaft, is provided with clamping block inside chuck body, the outer wall of chuck body offers hole, location, location is provided with latch segment in hole, the internal coaxial sleeve of main shaft is connected to pull bar, and one end of pull bar connects the piston rod of oil cylinder, and the other end of pull bar connects clamping block.Solve that rotary inertia present in the welding method of clamping of existing large-scale part is relatively big, the problem of part axiality difference after welding.

Description

A Friction Welding Fixture for Large Size Parts

technical field

The invention belongs to the technical field of friction welding clamping tools, and relates to a friction welding clamp for large-sized parts.

Background technique

In friction welding, tubular parts with an inner diameter of more than ￠280mm and an outer diameter of more than 310mm are called large-size parts. When friction welding large-size parts, the rotating fixture at the spindle end adopts the usual clamping of the outer circle of the welded part. Although the welding parts can be clamped, the rotating fixture must have a large external dimension because the outer diameter of the part is too large, which not only makes the moment of inertia of the rotating fixture very large, which is not conducive to the braking of the main shaft; and the rotating fixture is installed in the When the main shaft is on the large size, the deflection increases, the main shaft bears poor force and the service life is short, so that the coaxiality of the parts after welding is very poor and cannot meet the use requirements.

Contents of the invention

The object of the present invention is to provide a friction welding fixture for large-sized parts, which solves the problems of large moment of inertia and poor coaxiality of parts after welding existing in the welding clamping method of large-sized parts.

The technical solution adopted in the present invention is a friction welding fixture for large-sized parts, including a hollow main shaft, one end of the main shaft is provided with an oil cylinder, the other end of the main shaft is connected to the fixture body, and a clamping block is arranged inside the fixture body. A positioning hole is opened on the outer wall, and a locking block is arranged in the positioning hole. A pull rod is coaxially sleeved inside the main shaft. One end of the pull rod is connected to the piston rod of the oil cylinder, and the other end of the pull rod is connected to the clamping block.

The present invention is also characterized in that,

One end of the pull rod is provided with a protruding post a, and the outer wall of the protruding post a is processed with external threads, and the end of the piston rod of the oil cylinder is processed with a threaded hole a, and the protruding post a and the threaded hole a are connected by screwing, and the pull rod The other end of the is provided with a threaded hole b, and the protruding column a and the threaded hole b are both arranged on the central axis of the pull rod.

Wherein the clamping block includes a cylindrical block a, one end of the block a is provided with a protruding post b, the outer wall of the protruding post b is provided with an external thread, and the protruding post b extends into the inside of the threaded hole b and connects with the threaded hole b is connected by thread, the other end of the block a is provided with a conical block b, and the raised column b, the block a and the block b are coaxially arranged.

Among them, hole a, transition hole and hole b are sequentially opened in the center of the fixture body. Hole a is connected to one end of the fixture body, and hole b is connected to the other end of the fixture body. Hole a and the transition hole are round holes, and hole b It is a truncated cone-shaped hole that is truncated and adapted to the shape of the conical block b. The aperture of the hole a is smaller than the aperture of the transition hole. The block a is coaxially arranged inside the hole a, and the block b is coaxially arranged in the hole Inside b, the block b is adapted to the shape of the hole b.

The central angle of the hole b is 15°-25°, and the central angle of the block b is 20'-40' smaller than the central angle of the hole b.

The locking block is a T-shaped structure, the upper end surface of the locking block is an arc-shaped structure, and the upper end surface of the locking block is provided with a positioning groove, and the positioning grooves on each locking block are sequentially spliced to form an annular groove. An elastic steel wire retaining ring is connected, and the elastic steel wire retaining ring is provided with an opening, and the bottom of the locking block is processed with an inclined surface, which is in close contact with the outer wall of the block b.

Among them, 4 or 8 positioning holes are evenly opened along the circumferential direction of the fixture body.

The beneficial effect of the present invention is that the welding fixture provided by the present invention drives the fixture to open inside the welded part through hydraulic pressure and clamps the part, replacing the original clamping method of clamping on the outer circle of the part. In this way, when clamping larger-sized parts, the size of the fixture will not be too large, which avoids the problem of large moment of inertia of the fixture; at the same time, the coaxiality of the welded parts can be improved by adopting the clamping method provided by the invention.

Description of drawings

Fig. 1 is a structural schematic diagram of a friction welding fixture for large-sized parts of the present invention;

Fig. 2 is the front view of locking block in Fig. 1;

Fig. 3 is the left view of Fig. 2;

Fig. 4 is a sectional view along the direction A-A of Fig. 2 .

In the figure, 1. Oil cylinder, 2. Piston rod, 3. Threaded hole a, 4. Raised column a, 5. Main shaft, 6. Pull rod, 7. Threaded hole b;

8. Clamping block, 8-1. Raised column b, 8-2. Block a, 8-3. Block b;

9. Fixture body, 10. Hole a, 11. Transition hole, 12. Elastic traveler, 13. Hole b, 14. Parts to be welded, 15. Locking block, 16. Positioning groove, 17. Block.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The present invention is a friction welding fixture for large-sized parts. The structure is shown in Fig. 1, which includes a hollow main shaft 5, one end of the main shaft 5 is provided with an oil cylinder 1, and the other end of the main shaft 5 is connected to the fixture body 9, and the interior of the fixture body 9 is provided with a clamp Tight block 8, a positioning hole is provided on the outer wall of the fixture body 9, a locking block 15 is arranged in the positioning hole, a pull rod 6 is coaxially sleeved inside the main shaft 5 (the pull rod 6 is coaxial with the main shaft 5), and one end of the pull rod 6 is connected The other end of the piston rod 2 of the oil cylinder 1 and the pull rod 6 is connected with the clamping block 8 .

One end of the pull rod 6 is provided with a (cylindrical) protruding post a4, the outer wall of the protruding post a4 is processed with an external thread, and the end of the piston rod 2 of the oil cylinder 1 is processed with a threaded hole a3 (the threaded hole a3 is located at the end of the piston rod. center), the protruding post a4 and the threaded hole a3 are screwed together, and the other end of the pull rod 6 is provided with a threaded hole b7, and both the protruding post a4 and the threaded hole b7 are arranged on the central axis of the pull rod 6 .

The clamping block 8 comprises a cylindrical block a8-2, one end of the block a8-2 is provided with a (cylindrical) protruding post b8-1, and the outer wall of the protruding post b8-1 is provided with external threads, and the protruding Column b8-1 extends into threaded hole b7 and is threadedly connected with threaded hole b7. The other end of block a8-2 is provided with conical block b8-3, protruding column b8-1, block a8-2 and The blocks b8-3 are coaxially arranged (the raised column b8-1, the block a8-2 and the block b8-3 are three-part structures that make up the clamping block 8, that is, on the locking block 8 along the locking block On the central axis of 8, protruding column b8-1, block a8-2 and block b8-3 are sequentially processed. Since block b8-3 is in the shape of a circular frustum, the diameter of one end surface of block b8-3 is smaller than that of block The diameter of the end face of the other end of b8-3, the end face of block b8-3 with a smaller diameter is connected to block a8-2, and the radius of the end face of block b8-3 connected to block a8-2 is larger than that of block a8-2 The radius of the raised column b8-1 is smaller than the radius of the block a8-2).

A hole a10, a transition hole 11 and a hole b13 are opened in the center of the fixture body 9 in sequence. The hole a10 is connected to one end of the fixture body 9, and the hole b13 is connected to the other end of the fixture body 9. Both the hole a10 and the transition hole 11 are circular. The hole b13 is a truncated conical hole whose apex is truncated and adapted to the shape of the conical block b8-3. The diameter of the end face of the hole b13 is smaller than the diameter of the other end face of the hole b13. The end face of the smaller diameter of the hole b13 and The transition hole 11 is connected, and the diameter of the end face where the hole b13 connects with the transition hole 11 is smaller than the diameter of the transition hole 11 and larger than the diameter of the hole a10, that is, the diameter of the hole a10 is smaller than the diameter of the transition hole 11, and the block a8-2 is coaxially arranged Inside the hole a10 (that is, the block a8-2 is coaxial with the hole a10), the block b8-3 is coaxially arranged inside the hole b13, and the opposite sides of the fixture body 9 are respectively provided with stoppers 17, and the stoppers 17 are located at One end of the jig body 9 is connected to one end of the main shaft 5 .

Among them, the central angle of hole b13 is 15°～25°, and the optimal angle is 20°. 2 times that of the hole b13, that is, if the hole b13 is completed into a conical hole, the central angle of the hole b13 or the apex angle of the cone is 15° to 25°), and the central angle of the block b8-3 is smaller than that of the hole b13 20'～40' (Since the block b8-3 is in the shape of a conical cone, the central angle of the block b8-3 means twice the angle formed by the generatrix of the block b8-3 and the center line of the block b8-3, That is, if the block b8-3 is completed into a conical structure, the central angle or cone apex angle of the block b8-3 is 20′˜40′ smaller than the central angle of the hole b13).

Among them, 4 or 8 positioning holes are evenly opened along the circumferential direction of the clamp body 9 , and the center of each positioning hole is located on the same circumference of the outer wall of the clamp body 9 .

As shown in Figures 2 to 4, the locking block 15 is a T-shaped structure, and the upper end surface of the locking block 15 is an arc-shaped structure. The inner wall contacts and tightens the inner wall of the part to be welded 14, and the upper end surface of the locking block 15 is provided with a positioning groove 16 (the positioning groove 16 is parallel to and equal in length to the arc of the upper arc surface of the locking block 15), each locking The positioning grooves 16 on the blocks 15 are spliced end to end in order to form an annular groove, that is, the locking blocks 15 distributed on the fixture body 9 are distributed along the same circumference, and the end of the positioning groove 16 on the previous locking block 15 is connected to the next locking block The first end of the locating groove 16 on 15; The locating groove 16 is provided with at least more than two, and each locating groove 16 is mutually parallel and equally spaced, and each locating groove 16 on each locking block 15 is a part of an annular groove , that is, the locking block 15 is provided with several positioning grooves 16 and finally several annular grooves will be formed. Since only the vertical block body of the locking block 15 extends into the positioning hole, the positioning hole and the locking block 15 Adapt to the vertical block structure, the arc surface on the horizontal block of the locking block 15 is located above the positioning hole, when clamping the weldment, the horizontal block of the locking block 15 is close to the inner wall of the welded part 14 .

An elastic steel wire retaining ring 12 is sleeved on the annular groove, and the elastic steel wire retaining ring 12 is provided with an opening (to facilitate the installation and disassembly of the elastic steel wire retaining ring), and the bottom of the locking block 15 is processed with a slope. It is a circular frustum structure, so the outer wall of the block b8-3 is an arc surface, and the slope at the bottom of the locking block 15 is in line contact with the block b8-3, that is, one of the busbars on the block b8-3 and the locking block 15 is in contact with the slope at the bottom, and the slope at the bottom of the locking block 15 is parallel to the busbar so that the locking block 15 can closely fit the outer wall of the block b8-3.

The working principle of a friction welding fixture for large-sized parts of the present invention is that when the parts need to be welded, the fixture body 9 is coaxially sleeved inside the welded parts 14 (the fixture provided by the present invention is aimed at hollow sleeves) parts), two stoppers 17 are stuck on the end of the welded part 14, when the pressure oil enters the rod chamber of the cylinder 1, the piston rod 2 of the cylinder 1 moves to the left, thereby pulling the pull rod 6 and the clamping block 8 to move to the left , the block b8-3 makes the locking block 15 radially move and expand outward through the inner and outer matching conical surface formed with the locking block 15, and contacts with the inner hole of the welded part 14, and is welded as the pressure continues to increase The part 14 is tightened by the upper surface of the locking block 15, and the clamping of the part 14 to be welded before welding is completed; on the contrary, when the clamp needs to be withdrawn from the part 14 to be welded after welding, when the pressure oil enters the oil cylinder 1, the piston rod 2 of the oil cylinder 1 moves to the right to push the pull rod 6 and the clamping block 8 to move to the right, and the locking block 15 shrinks inward under the action of its own weight and the elastic force of the elastic steel traveler 12 with an opening , so that the locking block 15 is out of contact with the inner hole of the welded part 14, so that the welded part 14 is in a loose state, which is convenient for disassembling the welded part; the tapered hole b13 is set inside the clamp body 9 to ensure During the process of the welded parts 14, when the pressure oil of the oil cylinder 1 suddenly increases, the rightward displacement of the clamping block 8 will not be too large, and the radial displacement of the locking block 15 will not be large, so that the parts to be welded will not be moved. 14 Clamping.

Claims (7)

1. a large-scale part friction welding fixture, it is characterised in that: including the main shaft (5) of hollow, one end of main shaft (5) sets Having oil cylinder (1), other end jockey body (9) of main shaft (5), chuck body (9) is internal is provided with clamping block (8), and fixture is originally Offering hole, location on the outer wall of body (9), be provided with latch segment (15) in hole, described location, the internal coaxial sleeve of main shaft (5) is connected to draw Bar (6), one end of pull bar (6) connects the piston rod (2) of oil cylinder (1), and the other end of pull bar (6) connects clamping block (8).

A kind of large-scale part friction welding fixture the most according to claim 1, it is characterised in that: described pull bar (6) One end is provided with protruding post a (4), and the outer wall of protruding post a (4) is machined with external screw thread, piston rod (2) the end processing of oil cylinder (1) Having screwed hole a (3), protruding post a (4) to be connected by threaded engagement with screwed hole a (3), the other end of pull bar (6) offers screw thread Hole b (7), protruding post a (4), screwed hole b (7) are arranged on the central axis of pull bar (6).

A kind of large-scale part friction welding fixture the most according to claim 2, it is characterised in that: described clamping block (8) Including cylindrical block a (8-2), the end, one end of block a (8-2) is provided with protruding post b (8-1), the outer wall of protruding post b (8-1) Being provided with external screw thread, protruding post b (8-1) is stretched into screwed hole b (7) inside and is threaded connection with screwed hole b (7), block a (8- 2) the other end is provided with round table-like block b (8-3), and protruding post b (8-1), block a (8-2) and block b (8-3) are all coaxially disposed.

A kind of large-scale part friction welding fixture the most according to claim 3, it is characterised in that: described chuck body (9) center offers one end end face of porose a (10), transitional pore (11) and hole b (13), hole a (10) and chuck body (9) successively Through, hole b (13) is through with the other end end face of chuck body (9), and hole a (10) and transitional pore (11) are circular hole, hole b (13) For being truncated the vertex of a cone and the round table-like hole adapted with round table-like block b (8-3) shape, the aperture of hole a (10) is less than transitional pore (11) aperture, it is internal that block a (8-2) is co-axially located at hole a (10), and it is internal that block b (8-3) is co-axially located at hole b (13), block The shape of body b (8-3) and hole b (13) adapts.

A kind of large-scale part friction welding fixture the most according to claim 4, it is characterised in that: described hole b (13) Central angle is 15 °～25 °, the central angle of described block b (8-3) central angle little 20 '～40 ' than hole b (13).

A kind of large-scale part friction welding fixture the most according to claim 4, it is characterised in that: described latch segment (15) For T-shaped structure, the upper surface of latch segment (15) is convex structure, and the upper surface of latch segment (15) offers locating slot (16), Locating slot (16) on each latch segment (15) is spliced to form cannelure successively, and described cannelure is socketed with elastic steel wire check ring (12), elastic steel wire check ring (12) is provided with opening, and the bottom of latch segment (15) is machined with inclined-plane, described inclined-plane and block b (8- 3) outer wall fits tightly.

A kind of large-scale part friction welding fixture the most according to claim 1, it is characterised in that: hole, described location is along folder The circumference of tool body (9) uniformly offers 4 or 8.