Positioning mechanism for machining outer circle of deep hole part

Abstract

The utility model discloses a positioning mechanism for processing excircles of deep hole type parts, which comprises a body arranged on a machine tool spindle, the body is provided with a pull tube, a pull rod is arranged in the pull tube, a first expansion block and a second expansion block are arranged in the inner wall of the body, and the first expansion block and the second expansion block are arranged on the inner wall of the body. A first expansion core which slides in the body and is used for driving the first expansion block to open is arranged at the right end of the pull pipe, and a second expansion core which slides in the body and is used for driving the second expansion block to open is arranged at the right end of the pull rod. The body is fixed to a lathe spindle, the pull pipe and the pull rod penetrate through a through hole of the lathe spindle to be connected with the double-stroke rotary oil cylinder, the rotary oil cylinder stretches out and draws back to drive the first expansion core and the second expansion core to move axially through the pull pipe and the pull rod, the first expansion block and the second expansion block move in the radial direction, and a part to be machined is tensioned on a lathe. The coaxiality of the inner hole and the outer circle is guaranteed, the clamping stability is guaranteed, and the rigidity is good.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, in particular to a positioning mechanism for machining outer circles of deep hole parts. Background Art

[0002] In the process of machining long shaft parts, there is a kind of parts with long inner holes, such as shell shells, which need inner hole positioning and outer circle machining.

[0003] During the processing of such parts, the outer circle must be processed first, and then the inner hole. When processing the outer circle, the traditional processing method is to support the inner hole with the chuck claws and turn the other end of the tailstock. This positioning method is easy to cause the inner hole and the outer circle to be not coaxial for deep hole parts. When the inner hole is processed later, the inner hole cannot be turned due to the non-coaxiality. Utility Model Content

[0004] The utility model aims to solve the above problems and provide a positioning mechanism for machining outer circles of deep hole parts, which can ensure that the inner hole and the outer circle are coaxial during machining of deep hole parts and have high machining accuracy.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A positioning mechanism for machining the outer circle of deep-hole parts, comprising a main body installed on the main spindle of a machine tool, the main body being provided with a pull tube, a pull rod being provided inside the pull tube, a first expansion block and a second expansion block being provided in the inner wall of the main body, a first expansion core being provided at the right end of the pull tube and sliding in the main body for driving the first expansion block to open, and a second expansion core being provided at the right end of the pull rod and sliding in the main body for driving the second expansion block to open.

[0007] Furthermore, a connecting plate is provided at the left end of the body.

[0008] Furthermore, an end cover is provided at the right end of the body.

[0009] Furthermore, through holes are provided at positions of the inner wall of the body corresponding to the first expanding block and the second expanding block, and the first expanding block and the second expanding block are arranged in the corresponding through holes and slide in the through holes.

[0010] Furthermore, the right end of the outer cylindrical surface of the pull tube is threadedly connected to the inner hole of the first expansion core, and the right end of the pull rod is threadedly connected to the inner hole of the second expansion core.

[0011] Furthermore, the first expansion core and the second expansion core are each provided with a first inclined surface on their outer cylindrical surfaces, and the first expansion block and the second expansion block are each provided with a second inclined surface matching the first inclined surface at one inner end.

[0012] Furthermore, an expansion ring is provided on the outer cylindrical surface of the first expansion block and the outer cylindrical surface of the second expansion block.

[0013] The beneficial effects of the utility model are:

[0014] 1. The utility model includes a main body installed on the main shaft of a machine tool, wherein the main body is provided with a pull tube, a pull rod is provided inside the pull tube, a first expansion block and a second expansion block are provided in the inner wall of the main body, the right end of the pull tube is provided with a first expansion core that slides inside the main body and is used to drive the first expansion block to open, and the right end of the pull rod is provided with a second expansion core that slides inside the main body and is used to drive the second expansion block to open. The main body is fixed on the main shaft of the lathe, and the pull tube and the pull rod pass through the through hole of the main shaft of the machine tool and are connected to the double-stroke rotary oil cylinder. The rotary oil cylinder is extended and retracted to drive the first expansion core and the second expansion core to move axially through the pull tube and the pull rod, so that the first expansion block and the second expansion block produce radial movement, and the parts to be processed are tightened on the machine tool. It not only ensures the coaxiality of the inner hole and the outer circle, but also ensures the stability of the clamping and good rigidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a cross-sectional view of the utility model.

[0017] In the figure: body 1, pull tube 2, pull rod 3, first expansion block 4, second expansion block 5, first expansion core 6, second expansion core 7, connecting plate 8, end cover 9, expansion ring 10. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0019] like Figure 1As shown, a positioning mechanism for machining the outer circle of deep-hole parts includes a main body 1 installed on the main spindle of a machine tool. The main body 1 is a sleeve structure. The main body 1 is provided with a pull tube 2. A pull rod 3 is provided in the pull tube 2. The length of the pull tube 2 is shorter than that of the pull rod 3. A first expansion block 4 and a second expansion block 5 are provided in the inner wall of the main body 1. The right end of the pull tube 2 is provided with a first expansion core 6 that slides in the main body 1 and is used to drive the first expansion block 4 to open. The right end of the pull rod 3 is provided with a second expansion core 7 that slides in the main body 1 and is used to drive the second expansion block 5 to open.

[0020] The main body is fixed on the spindle of the lathe. The pull tube 2 and the pull rod 3 pass through the through hole of the machine tool spindle and are connected to the double-stroke rotary cylinder. The rotary cylinder is extended and retracted through the pull tube 2 and the pull rod 3 to drive the first expansion core 6 and the second expansion core 7 to move axially, so that the first expansion block 4 and the second expansion block 5 move radially, and the parts to be processed are tightened on the machine tool. It not only ensures the coaxiality of the inner hole and the outer circle, but also ensures the stability of the clamping and good rigidity. The double-stroke cylinder ensures that the front and rear of the parts are tightened separately without interfering with each other. The design of the front and rear expansion blocks requires the coaxiality to be within 0.03mm to prevent the workpiece from warping during clamping. At the same time, the expansion blocks can be replaced to increase the service life.

[0021] A connecting plate 8 is provided at the left end of the body 1, and the body 1 is fixed to the main shaft of the lathe through the connecting plate 8 and screws.

[0022] An end cover 9 is disposed at the right end of the body 1 .

[0023] Through holes are provided at positions of the inner wall of the body 1 corresponding to the first expanding block 4 and the second expanding block 5 , and the first expanding block 4 and the second expanding block 5 are arranged in the corresponding through holes and slide in the through holes.

[0024] The right end of the outer cylindrical surface of the pull tube 2 is threadedly connected to the inner hole of the first expansion core 6. The right end of the outer cylindrical surface of the pull tube 2 is provided with an external thread, and the inner wall of the first expansion core 6 is provided with an internal thread that matches the external thread on the right end of the pull tube 2. The right end of the pull rod 3 is threadedly connected to the inner hole of the second expansion core 7. The right end of the pull rod 3 is provided with a threaded rod, and the inner wall of the second expansion core 7 is provided with an internal thread that matches the threaded rod.

[0025] The first expanding core 6 and the second expanding core 7 are each provided with a first inclined surface on their outer cylindrical surfaces, and the first expanding block 4 and the second expanding block 5 are each provided with a second inclined surface matching the first inclined surface at one end of their inner sides. When the first expanding core 6 and the second expanding core 7 move to the left, under the action of the first inclined surface and the second inclined surface, the first expanding block 4 and the second expanding block 5 move outward and open.

[0026] The outer cylindrical surface of the first expansion block 4 and the outer cylindrical surface of the second expansion block 5 are both provided with an expansion ring 10, and the outer cylindrical surface of the first expansion block 4 and the outer cylindrical surface of the second expansion block 5 are both provided with a groove, and the expansion ring is located in the groove, and the expansion ring is an elastic ring structure. When the first expansion core 6 and the second expansion core 7 move to the right, under the action of the expansion ring 10, the first expansion block 4 and the second expansion block 5 move inward and retract, and retract under the action of elastic force, and the workpiece can be taken out, which is convenient for replacing the workpiece.

[0027] In the description of the present invention, it should be noted that the terms "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection, it can be a direct connection, it can be an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A positioning mechanism for machining outer circles of deep hole parts, characterized in that: The invention comprises a main body (1) mounted on a main spindle of a machine tool, wherein the main body (1) is provided with a pull tube (2), a pull rod (3) is arranged inside the pull tube (2), a first expansion block (4) and a second expansion block (5) are arranged in the inner wall of the main body (1), a first expansion core (6) which slides inside the main body (1) and is used to drive the first expansion block (4) to open is arranged at the right end of the pull tube (2), and a second expansion core (7) which slides inside the main body (1) and is used to drive the second expansion block (5) to open is arranged at the right end of the pull rod (3).

2. A positioning mechanism for machining outer circles of deep hole parts as claimed in claim 1, characterized in that: A connecting plate (8) is provided at the left end of the body (1).

3. A positioning mechanism for machining outer circles of deep hole parts as claimed in claim 1, characterized in that: An end cover (9) is provided at the right end of the body (1).

4. A positioning mechanism for machining outer circles of deep hole parts as claimed in claim 1, characterized in that: Through holes are provided at positions of the inner wall of the body (1) corresponding to the first expansion block (4) and the second expansion block (5); the first expansion block (4) and the second expansion block (5) are arranged in the corresponding through holes and slide in the through holes.

5. A positioning mechanism for machining outer circles of deep hole parts as claimed in claim 1, characterized in that: The right end of the outer cylindrical surface of the pull tube (2) is threadedly connected to the inner hole of the first expansion core (6), and the right end of the pull rod (3) is threadedly connected to the inner hole of the second expansion core (7).

6. A positioning mechanism for machining outer circles of deep hole parts as claimed in claim 1, characterized in that: The first expansion core (6) and the second expansion core (7) are both provided with a first inclined surface on their outer cylindrical surfaces, and the first expansion block (4) and the second expansion block (5) are both provided with a second inclined surface matching the first inclined surface at one end of their inner sides.

7. A positioning mechanism for machining outer circles of deep hole parts as claimed in claim 1, characterized in that: An expansion ring (10) is provided on the outer cylindrical surface of the first expansion block (4) and the outer cylindrical surface of the second expansion block (5).

Images