阅读说明：本技术 一种精密薄板类零件的低应力装夹工装及方法 (Low-stress clamping tool and method for precision sheet parts ) 是由 孙攀攀 谢新春 王晓琳 于 2019-10-20 设计创作，主要内容包括：本发明提出一种精密钛合金薄板类零件的低应力装夹工装及方法,装夹工装由左、右两部分组成,每部分的主体中具有用于夹持的斜边和用于装夹零件的装夹凹槽；装夹凹槽具有侧向开口,平面形状为三角形；装夹凹槽实际存在的两个边之间的夹角等于待加工薄板类零件的某一夹角；用于夹持的斜边处于主体的侧面；当待加工薄板类零件处于工装的装夹凹槽内后,用于夹持的斜边平行于待加工薄板类零件对角线。本发明通过设计低应力装夹工装,以平行于待加工薄板类零件平行四边形夹持面对角线方向作为虎钳钳口的夹持方向,能够在降低零件装夹应力的同时,保证零件夹持可靠,同时也使装夹应力均匀分布,减少应力集中,保证了此类薄板类零件的加工精度。(The invention provides a low-stress clamping tool and a low-stress clamping method for precision titanium alloy sheet parts, wherein the clamping tool consists of a left part and a right part, and a main body of each part is provided with a bevel edge for clamping and a clamping groove for clamping the parts; the clamping groove is provided with a lateral opening, and the plane shape of the clamping groove is triangular; an included angle between two actually existing edges of the clamping groove is equal to a certain included angle of the thin plate type part to be processed; the bevel edge for clamping is arranged on the side surface of the main body; when the sheet part to be processed is positioned in the clamping groove of the tool, the bevel edge for clamping is parallel to the diagonal line of the sheet part to be processed. According to the invention, by designing the low-stress clamping tool, the direction parallel to the diagonal direction of the parallelogram clamping surface of the sheet part to be processed is taken as the clamping direction of the jaw of the vice, so that the clamping stress of the part can be reduced, the clamping reliability of the part can be ensured, the clamping stress is uniformly distributed, the stress concentration is reduced, and the processing precision of the sheet part is ensured.)

1. The utility model provides a low stress clamping frock of accurate sheet metal class part which characterized in that: the thin plate type part is a thin plate type part with a parallelogram clamping surface;

the tool consists of a left part and a right part, wherein the main bodies of the two parts are completely the same and the whole tool is blocky; the main body of each part is provided with a bevel edge for clamping and a clamping groove for clamping a part;

the clamping groove is positioned on the front surface of the main body and is provided with a lateral opening and a triangular plane shape; an included angle between two actually existing edges of the clamping groove is equal to a certain included angle in a parallelogram clamping surface of the sheet part to be processed;

the bevel edge for clamping is positioned on the side surface of the main body; when the thin plate part to be processed is positioned in the clamping groove of the tool, the bevel edge for clamping is parallel to a diagonal line of the thin plate part to be processed, which is opposite to the included angle of two sides of the clamping groove.

2. The low-stress clamping tool for the precision sheet parts as claimed in claim 1, wherein the tool comprises: and a abdicating groove is formed at the vertex of the included angle of the clamping groove.

3. The low-stress clamping tool for the precision sheet parts as claimed in claim 1, wherein the tool comprises: the length of two edges of the clamping groove is in the same proportion with the length of two adjacent edges in a parallelogram clamping surface of the sheet part to be processed, and the proportionality coefficient is less than 1: l is_Gi＝a×L_PiWherein i is the serial number of the edge of the clamping groove, i is 1 or 2, and L_GiFor clamping the side length of the groove, L_PiThe length of the corresponding side in the parallelogram clamping surface of the sheet part to be processed is a proportionality coefficient.

4. The low-stress clamping tool for the precision sheet parts as claimed in claim 2, wherein the tool comprises: a is more than 0.8 and less than 0.98.

5. The low-stress clamping tool for the precision sheet parts as claimed in claim 1, wherein the tool comprises: clamping groove depth D: d is more than 0.5D and less than 1.5D, wherein D is the thickness of the edge of the parallelogram clamping surface of the sheet part to be processed.

6. The low-stress clamping tool for the precision sheet parts as claimed in claim 1, wherein the tool comprises: the bottom surface and the side wall of the clamping groove have the requirements of flatness, verticality, parallelism and surface roughness higher than the precision requirement of the sheet part to be processed.

7. The method for realizing low-stress clamping of the precision sheet part by using the tool of claim 1 is characterized by comprising the following steps of: the method comprises the following steps:

step 1: the clamping tool is arranged in a vice, and clamping grooves of the left part and the right part of the clamping tool are oppositely arranged;

step 2: placing two opposite angles of a parallelogram clamping surface of a sheet part to be processed in clamping grooves of a left part and a right part of a clamping tool respectively;

and step 3: and adjusting the jaw of the vice, slowly clamping the vice, and pressing the upper surface of the part to enable the lower surface of the part to be tightly attached to the clamping groove until the part reaches a clamping state.

Technical Field

The invention relates to the field of aviation manufacturing, in particular to a low-stress clamping tool and a low-stress clamping method for precision thin plate parts.

Background

In an aviation head-up display system, a thin plate part provides a positioning and mounting reference for an optical subassembly in the aviation head-up display system, so that the form and position tolerance precision of the part is high. The parts are mostly thin plates with the thickness of about 5mm, the materials are mostly titanium alloys difficult to process, X, Y, Z three-direction processing is carried out on the parts during processing, due to the fact that the thickness is small, the materials are difficult to process, cutter back-off phenomenon is easily generated due to cutting action in the traditional processing process, the phenomenon of upper thickness, lower thickness and size super-difference is caused, and deformation is obvious after processing.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a low-stress clamping tool and a low-stress clamping method for a precision titanium alloy sheet part.

The technical scheme of the invention is as follows:

the low-stress clamping tool for the precision sheet parts is characterized in that: the thin plate type part is a thin plate type part with a parallelogram clamping surface;

the tool consists of a left part and a right part, wherein the main bodies of the two parts are completely the same and the whole tool is blocky; the main body of each part is provided with a bevel edge for clamping and a clamping groove for clamping a part;

the clamping groove is positioned on the front surface of the main body and is provided with a lateral opening and a triangular plane shape; an included angle between two actually existing edges of the clamping groove is equal to a certain included angle in a parallelogram clamping surface of the sheet part to be processed;

the bevel edge for clamping is positioned on the side surface of the main body; when the thin plate part to be processed is positioned in the clamping groove of the tool, the bevel edge for clamping is parallel to a diagonal line of the thin plate part to be processed, which is opposite to the included angle of two sides of the clamping groove.

Further preferred scheme, a low stress clamping frock of accurate sheet metal class part, its characterized in that: and a abdicating groove is formed at the vertex of the included angle of the clamping groove.

Further preferred scheme, a low stress clamping frock of accurate sheet metal class part, its characterized in that: parallelogram clamp for clamping two side lengths of groove and thin plate part to be processedThe lengths of two adjacent edges in the holding surface are in the same proportion, and the proportionality coefficient is less than 1: l is_Gi＝a×L_PiWherein i is the serial number of the edge of the clamping groove, i is 1 or 2, and L_GiFor clamping the side length of the groove, L_PiThe length of the corresponding side in the parallelogram clamping surface of the sheet part to be processed is a proportionality coefficient.

Further preferred scheme, a low stress clamping frock of accurate sheet metal class part, its characterized in that: a is more than 0.8 and less than 0.98.

Further preferred scheme, a low stress clamping frock of accurate sheet metal class part, its characterized in that: clamping groove depth D: d is more than 0.5D and less than 1.5D, wherein D is the thickness of the edge of the parallelogram clamping surface of the sheet part to be processed.

Further preferred scheme, a low stress clamping frock of accurate sheet metal class part, its characterized in that: the bottom surface and the side wall of the clamping groove have the requirements of flatness, verticality, parallelism and surface roughness higher than the precision requirement of the sheet part to be processed.

The method for realizing low-stress clamping of the precision sheet part by using the tool is characterized by comprising the following steps of: the method comprises the following steps:

step 1: the clamping tool is arranged in a vice, and clamping grooves of the left part and the right part of the clamping tool are oppositely arranged;

step 2: placing two opposite angles of a parallelogram clamping surface of a sheet part to be processed in clamping grooves of a left part and a right part of a clamping tool respectively;

and step 3: and adjusting the jaw of the vice, slowly clamping the vice, and pressing the upper surface of the part to enable the lower surface of the part to be tightly attached to the clamping groove until the part reaches a clamping state.

Advantageous effects

According to the invention, by designing the low-stress clamping tool, the direction parallel to the diagonal direction of the parallelogram clamping surface of the sheet part to be processed is taken as the clamping direction of the jaw of the vice, so that the clamping stress of the part can be reduced, the clamping reliability of the part can be ensured, the clamping stress is uniformly distributed, the stress concentration is reduced, and the processing precision of the sheet part is ensured.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1: a two-dimensional schematic view of a part;

FIG. 2 is a drawing: a three-dimensional schematic diagram of the front surface of the part;

FIG. 3: a three-dimensional schematic diagram of the reverse side of the part;

FIG. 4 is a drawing: a schematic diagram of the left half part of the low-stress clamping tool;

FIG. 5: a right half schematic view of the low-stress clamping tool;

FIG. 6: a low-stress clamping tool combination schematic diagram;

FIG. 7: a schematic diagram of a fixture clamping part;

FIG. 8: a tool stress schematic diagram;

FIG. 9: the part is a stress decomposition schematic diagram;

FIG. 10: the part is uniformly stressed.

Detailed Description

The following detailed description of embodiments of the invention is intended to be illustrative, and not to be construed as limiting the invention.

According to the external dimension of the precision titanium alloy sheet part, see the attached drawings I-III: the two-dimensional and three-dimensional schematic diagram of the part is that the sheet part is a sheet part with a parallelogram clamping surface; designing a low-stress clamping tool, wherein the tool consists of a left part and a right part, the main bodies of the two parts are completely the same, and the whole part is blocky, and is shown in the attached drawings of four parts to six parts: the main body of each part is provided with a bevel edge for clamping and a clamping groove for clamping a part.

The clamping groove is positioned on the front surface of the main body and is provided with a lateral opening and a triangular plane shape; the included angle between two actually existing edges of the clamping groove is equal to a certain included angle in the parallelogram clamping surface of the sheet part to be processed. The included angle vertex of the clamping groove is provided with a abdicating groove which can be cylindrical, rectangular or square.

The length of two edges of the clamping groove is in the same proportion with the length of two adjacent edges in a parallelogram clamping surface of the sheet part to be processed, and the proportionality coefficient is less than 1: l is_Gi＝a×L_PiWherein i is the serial number of the edge of the clamping groove, i is 1 or 2, and L_GiFor clamping the side length of the groove, L_PiThe corresponding side length in the parallelogram clamping surface of the sheet part to be processed is represented by a proportionality coefficient, wherein a is more than 0.8 and less than 0.98. Clamping groove depth D: d is more than 0.5D and less than 1.5D, wherein D is the thickness of the edge of the parallelogram clamping surface of the sheet part to be processed. The bottom surface and the side wall of the clamping groove have the requirements of flatness, verticality, parallelism and surface roughness higher than the precision requirement of the sheet part to be processed.

The bevel edge for clamping is positioned on the side surface of the main body; when the thin plate part to be processed is positioned in the clamping groove of the tool, the bevel edge for clamping is parallel to a diagonal line of the thin plate part to be processed, which is opposite to the included angle of two sides of the clamping groove.

The method for realizing low-stress clamping of the precision sheet part by using the tool comprises the following steps:

step 1: selecting a vice with a proper jaw, opening the jaw to the maximum, installing a clamping tool into the vice, and oppositely placing clamping grooves of the left part and the right part of the clamping tool;

step 2: placing two opposite angles of a parallelogram clamping surface of a sheet part to be processed in clamping grooves of a left part and a right part of a clamping tool respectively;

and step 3: and adjusting the jaw of the vice, slowly clamping the vice, and pressing the upper surface of the part to enable the lower surface of the part to be tightly attached to the clamping groove until the part reaches a clamping state.

Then, the cutting processing such as milling, drilling and the like of the parts can be carried out.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.