CN211332195U

CN211332195U - Positioning fixture for thin-wall blind hole part

Info

Publication number: CN211332195U
Application number: CN201922130480.4U
Authority: CN
Inventors: 盖文; 袁明; 张景娟
Original assignee: Shannxi Diesel Engine Heavy Industry Co Ltd
Current assignee: Shannxi Diesel Engine Heavy Industry Co Ltd
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-08-25
Anticipated expiration: 2029-12-03

Abstract

The utility model discloses a thin-wall blind hole part positioning fixture, which comprises a fixing part for fixing a part to be processed and a positioning mandrel for fixing the fixing part; wherein, be equipped with the hook piece on the mounting, the mounting is at least for two, be equipped with the fixed orifices on the location mandrel, the fixed orifices number is the same with the fixed number of pieces, the utility model discloses its simple structure, simple to operate can effectually fix the part of processing.

Description

Positioning fixture for thin-wall blind hole part

Technical Field

The utility model relates to a machining field, specificly relates to a positioning fixture of thin wall blind hole part.

Background

In the design of mechanical parts, a large number of thin-wall blind hole parts exist, and the parts have complex structures and high processing precision. Particularly, the excircle and the inner hole of the part have higher requirements on dimensional accuracy and roundness, finish machining is required, the machining is required to be completed in one clamping process, and the existence of a cutter connecting is not allowed. The general processing method is to finely bore or finely grind the inner hole and then finely turn or finely grind the outer circle. Because blind hole thin wall part yielding, can't utilize drill way chamfer to fix a position when the hole is great, the part inner and outer circle is the finish machining face, is difficult to press from both sides tightly, and there is great degree of difficulty in designing positioning fixture. The common clamp design method is to design a positioning clamp such as an expandable mandrel in interference fit, and due to the fact that a large tensioning force exists in the part clamping process, the clamp has the advantages that deformation is large in the clamping process, precision of excircle finish machining is not easy to guarantee, and meanwhile the machined inner hole surface is easy to influence or damage. Meanwhile, in the clamping process of the clamp, the tensioning force is large, the clamp is difficult to mount and dismount, and the machining efficiency is low. In order to realize the precise and efficient machining of the thin-wall blind hole part, avoid the clamping deformation of the part and ensure the stable and reliable machining quality of the part, the design of a positioning clamp of the thin-wall blind hole part needs to be researched, and the machining requirement of the part is met.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages which will be described later.

The utility model provides a positioning fixture of thin wall blind hole part, its simple structure, simple to operate can effectually fix the processing part.

In order to achieve these objects and other advantages in accordance with the purpose of the invention, the technical solution of the present invention is as follows:

in the fine machining stage of the part, the inner hole of the part is firstly subjected to fine turning or fine grinding, so that the precision of the inner hole meets certain requirements, and a process reference is made for fine machining of the excircle. Then designing a small-gap positioning mandrel according to the structure of the part, tensioning by using a fixing piece through axial force to realize clamping of the clamp, designing a high-precision center hole coaxial with the positioning mandrel at the end part of the positioning mandrel, and then positioning by using a tip hole on a lathe or a grinding machine to finish the excircle.

The utility model discloses fine solution thin wall blind hole part be difficult to clamping location and the easy difficult problem that warp of excircle finish machining, especially complicated to the structure, the finish machining of the part that the size precision requires high has better processing effect, compares with prior art and has following advantage:

1. novel design, easy to operate: through small-gap positioning and clamping of the fixing piece, the difficult problem that a thin-wall blind hole part is difficult to position and clamp is solved, the problems that the traditional expanding plug clamping process is labor-consuming, the clamp is difficult to assemble and disassemble and the machined surface of the part is easy to damage are solved, and an operator can realize the installation, the positioning and the part machining of the positioning clamp through simple operation.

2. Safe and reliable: through the design of the T-shaped groove at the end part of the fixing piece, an operator can clearly determine the installation direction of the hook-shaped pressing plate, and the clamp is ensured to clamp a part safely and reliably.

3. The machining precision is higher, and the quality is stable: by applying the positioning fixture, the thin-wall part can be quickly clamped and positioned, and small clearance fit is adopted, so that clamping deformation caused by clamps such as an expandable mandrel and the like is avoided, the part is hardly deformed before and after clamping, the consistency of the machining size is good, the machining precision is controllable, the machining precision is higher, and the quality is stable.

4. Simple manufacture, low in production cost, convenient to popularize and use: the manufacturing material of the utility model can be realized by adopting common 20# and 45# high-quality carbon structural steel through quenching and tempering and carburizing quenching treatment.

5. Wide application range and high popularization value. Precision finishing of thin wall blind hole part exists in a large number in machine part processing, and the ubiquitous difficult problem of this type of processing exists in the course of working, the utility model discloses a solve this type of problem and provide economical and feasible thinking, the range of application is wider, has better spreading value.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of one embodiment of the present invention.

Fig. 2 is a schematic side view of the structure according to one embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a part to be processed according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of a positioning mandrel according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a fixing member according to an embodiment of the present invention.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

The terms "left end" and "right end" and the like in the description and claims of the embodiments of the present invention are used to distinguish different objects, rather than to describe a particular direction of an object.

The following detailed description of the positioning fixture provided by the present invention is made through specific embodiments and application scenarios thereof with reference to the accompanying drawings:

as shown in fig. 1, an embodiment of the present invention provides a positioning fixture for a thin-wall blind hole part, including a fixing member 2 for fixing a part to be processed, and a positioning mandrel 3 for fixing the fixing member 2;

the fixing part 2 is provided with at least two hook parts 1, the number of the fixing parts 2 is at least two, the positioning mandrel 3 is provided with fixing holes 8, and the number of the fixing holes 8 is the same as that of the fixing parts 2.

As shown in fig. 5, it can be understood that, in the embodiment of the present invention, the fixing member 2 is shaped as a cylinder; the hook piece 1 is arranged at the left end of the cylinder, and the hook piece 1 is clamped at the boss 10 part in the part to be processed; the right-hand member of mounting 2 is equipped with the screw thread, and it can compress tightly mounting 2 and the part of waiting to process with nut 7 cooperation.

Optionally, the right end face of the fixing member 2 is provided with a groove, and the groove may include at least one of the following: triangle-shaped, figures that can carry out direction indication such as Y shape, V-arrangement and T type, it is specific, can inject according to the in-service use habit the utility model discloses a one of them embodiment selects the figure that the T shape is as direction indication, sets up the recess into the T shape.

It can be understood that the direction of indication of the T-shaped groove 9 is the same as the direction designed for the hook shape, so that the direction of the hook 1 can be clearly determined by the user through the T-shape, and the safety and the reliability of the clamp on the part to be processed are ensured.

As shown in fig. 3, it can be understood that the body of the positioning spindle 3 comprises two cylinders: a first cylinder 4 and a second cylinder 5; the diameter of the first cylinder 4 is the same as the inner diameter of the part spigot 11 to be machined, and the diameter of the second cylinder 5 is larger than the inner diameter of the part spigot 11 to be machined.

The fixing hole 8 on the positioning mandrel 3 is cylindrical, and the diameter of the fixing hole 8 is the same as the outer diameter of the fixing piece 2.

In the embodiment provided by the utility model, as shown in fig. 1, 2, 3, 4, 5, the utility model discloses a positioning fixture of thin wall blind hole part, its installation and use are as follows:

firstly, the left end of the fixing part 2 with the hook part 1 is placed inside a part to be processed, the hook part 1 is clamped into a boss 10 part inside the part to be processed, and the fixing parts 2 are sequentially clamped.

Secondly, the fixing hole 8 of the positioning mandrel 3 corresponds to the fixing part 2 in position, and the positioning mandrel 3 is pressed, so that the right end of the fixing part 2 sequentially penetrates through the first cylinder 4 and the second cylinder 5 and the threaded part leaks out; while the first cylinder 4 is snapped into the part to be machined.

Thirdly, a washer 7 and a nut 7 are sequentially placed at the right end of the thread of the fixing piece 2, and the part to be processed and the positioning fixture are fixed by tightening the nut 7, so that the use safety is ensured.

While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments. It can be applicable to various and be fit for the utility model discloses a field completely. Additional modifications will readily occur to those skilled in the art. The invention is therefore not to be limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims

1. A positioning fixture for a thin-wall blind hole part is characterized by comprising a fixing piece for fixing a part to be processed and a positioning mandrel for fixing the fixing piece;

the fixing part is provided with at least two hook parts, the positioning mandrel is provided with fixing holes, and the number of the fixing holes is the same as that of the fixing pieces.

2. The positioning fixture for the thin-wall blind hole part according to claim 1, wherein the main body of the fixing member is a cylinder, the hook member is arranged at the left end of the cylinder, and the hook member is locked at a boss portion in the part to be processed.

3. The positioning fixture for the thin-wall blind hole part as claimed in claim 2, wherein the right end of the fixing member is provided with threads.

4. The positioning fixture for the thin-walled blind hole part as claimed in claim 2, wherein the fixing member is provided with a T-shaped groove on the right end face, and the direction of the T-shaped groove is the same as the designed direction of the hook shape.

5. The positioning fixture for the thin-wall blind hole part as claimed in claim 1, wherein the main body of the positioning mandrel comprises two cylinders: a first cylinder and a second cylinder; the diameter of the first cylinder is the same as the inner diameter of a spigot of a part to be machined, and the diameter of the second cylinder is larger than the inner diameter of the spigot of the part to be machined.

6. The positioning fixture for the thin-wall blind hole part according to claim 1, wherein the fixing hole of the positioning mandrel is cylindrical, and the diameter of the fixing hole is the same as the outer diameter of the fixing member.