CN110238676A - A positioning fixture with high dimensional consistency in machining - Google Patents

Abstract

The invention discloses a positioning fixture with high consistency in machining dimensions, which belongs to the technical field of machining and solves the problem that the gap between a workpiece and a support surface easily affects the consistency of the machining dimensions of the workpiece; the positioning fixture includes a tooling base , the tooling base is provided with a positioning mechanism and a supporting mechanism, and also includes a support seat, a column and a control mechanism for adjusting the height of the column, the support seat is fixed on the top surface of the tooling base, and the column slides It passes through the support seat and is connected with the control mechanism, and the control mechanism is placed in the tool base. The invention can uniquely determine the positioning position of the workpiece and improve the consistency of the processing size of the workpiece.

Description

A positioning fixture with high dimensional consistency in machining

technical field

The invention relates to the technical field of machining, and more specifically, relates to a positioning fixture with high machining dimension consistency.

Background technique

In mechanical processing, the workpiece is usually positioned with two pins on one side. The positioning tool is provided with a support surface and two pin installation holes. The support surface is used to support the position of the workpiece, and the workpiece is fixed by the corresponding clamping mechanism. On the support surface, two processing holes are opened on the workpiece, and two positioning pins are used to locate the relative position of the workpiece on the support surface. Because the contact area between the workpiece and the support surface is too large, there will be a gap at the contact position between the workpiece and the support surface during the clamping process. If the clamping force is too large, it will cause deformation of the workpiece. If the clamping force is too large If it is small, the position of the workpiece during processing cannot be well fixed. In addition, due to the gap between the workpiece and the support surface, the position of the workpiece on the support surface cannot be uniquely determined. During the processing, the workpiece will move slightly on the support surface, which affects the consistency of the workpiece's processing size. When the workpiece is unclamped, the machining dimension will deviate due to the deformation of the workpiece. Therefore, it is necessary to design a positioning fixture with high consistency in machining dimensions.

Contents of the invention

The object of the present invention is to provide a positioning jig with high consistency in machining dimensions, which can uniquely determine the positioning position of a workpiece and improve the consistency of machining dimensions of the workpiece.

The technical scheme that the present invention adopts is as follows:

A positioning fixture with high machining dimension consistency, comprising a tooling base, a positioning mechanism and a supporting mechanism are arranged on the tooling base, and a supporting seat, a column, and a control mechanism for adjusting the height of the column, the supporting The seat is fixed on the top surface of the tooling base, the column slides through the supporting seat and is connected with the control mechanism, and the control mechanism is placed in the tooling base.

Further, the control mechanism includes a wedge connected to the bottom of the column and a pull rod inserted through the side of the tool base, one side of the pull rod is connected to the wedge, and the periphery of the pull rod is close to the wedge A spring is sheathed on one side, and an inclined surface matching the inclined surface of the wedge is provided at the bottom of the column.

Further, a limiting groove is provided on the inclined surface of the wedge, and a limiting block matching the limiting groove is arranged on the inclined surface.

Further, the uppermost end of the inclined plane of the wedge is provided with an engaging portion, and the engaging portion is provided with a connected groove and an opening in the radial direction, and a boss is arranged on one side of the pull rod, and the boss passes through The opening is plugged into the groove.

Further, the pull rod is provided with a plurality of pin holes distributed at intervals, and the pin holes are separated from the spring by a washer, and the washer is fixed on the side of the tooling base.

Further, a handwheel is provided on the other side of the pull rod.

Further, a pushing mechanism corresponding to the positioning mechanism is provided on the base of the tool, the pushing mechanism includes an L-shaped plate and a locking screw, one side of the L-shaped plate is fixed to the tool On the top surface of the base, the locking screw is screwed to the other side of the L-shaped plate.

Further, the positioning mechanism includes cylindrical pins and rhombic pins fixed to the tooling base.

Further, the support mechanism includes three positioning blocks fixed to the tool base, each of the positioning blocks is provided with two fixing holes parallel to each other.

Compared with prior art, the beneficial effect that the present invention has is:

(1) A positioning fixture of the present invention with high consistency in machining dimensions can effectively fix the position of the workpiece by using the positioning mechanism and the supporting mechanism, and can provide locking force from the side of the workpiece by using the pushing mechanism, effectively Eliminate the gap between the positioning pin and the processing hole on the workpiece, and improve the positioning accuracy of the workpiece.

(2) In addition, the support mechanism is composed of three positioning blocks, columns, support seats and a control mechanism. The control mechanism can effectively eliminate the fixed gap between the workpiece and the support mechanism, and the control mechanism can effectively control the vertical movement of the column. It is convenient to adjust the position of the column.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the coordination structure of the present invention;

Fig. 3 is the sectional enlarged structural schematic diagram of control mechanism in Fig. 1;

Fig. 4 is the enlarged structural representation of column in Fig. 3;

Fig. 5 is the schematic diagram of the enlarged structure of the wedge in Fig. 3;

Fig. 6 is a schematic diagram of an enlarged structure of the positioning block in Fig. 1;

In the figure, 1. Tooling base, 2. L-shaped plate, 3. Locking screw, 4. Cylindrical pin, 5. Rhombus pin, 6. Pull rod, 61. Boss, 62. Pin hole, 63. Handwheel, 7 , column, 71, inclined surface, 72, limiting block, 8, support seat, 9, positioning block, 91, fixing hole, 10, workpiece, 11, wedge block, 11a, limiting groove, 11b, engaging part, 111, groove, 112, opening, 12, spring, 13, washer.

Detailed ways

The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments, but this does not constitute any limitation to the present invention.

Referring to Fig. 1 to Fig. 6, a positioning fixture with high mechanical processing size consistency of the present invention includes a tooling base 1, a positioning mechanism and a supporting mechanism are arranged on the tooling base 1, and a support seat 8, a column 7 and The control mechanism for adjusting the height of the column 7, the support base 8 is fixed on the top surface of the tool base 1, the column 7 slides through the support base 8 and is connected with the control mechanism, and the control mechanism is placed in the tool base 1. The positioning mechanism is used for locating the position of the workpiece 10 on the tooling base 1, effectively supports the bottom surface of the workpiece 10 through the support mechanism, and adjusts the height of the support point through the column 7 and the control mechanism to realize seamless support for the workpiece 10.

The control mechanism includes a wedge 11 connected to the bottom of the column 7 and a pull rod 6 inserted on the side of the tooling base 1. One side of the pull rod 6 is connected to the wedge 11. A spring 12 is set on the side of the pull rod 6 near the wedge 11. The column 7 The bottom is provided with an inclined surface 71 adapted to the inclined surface of the wedge 11 . The height of the column 7 is effectively adjusted by the control mechanism, and at the same time, the position of the column 7 is fixed during the processing of the workpiece 10. While the height of the column 7 is adjusted, the position of the column 7 is locked, and the elastic force of the spring 12 is used to push the wedge. The block 11 moves inward, and then drives the column 7 to move upward to the bottom surface of the workpiece 10 .

A limiting groove 11 a is provided on the inclined surface of the wedge 11 , and a limiting block 72 matching the limiting groove 11 a is arranged on the inclined surface 71 . Through the cooperation of the limit groove 11a and the limit block 72, the position of the column 7 is fixed by self-locking while the movement of the column 7 is realized, so as to effectively support the workpiece 10 during the processing of the workpiece 10 .

The highest end of the slope of the wedge 11 is provided with an engaging portion 11b, and the engaging portion 11b is provided with a connected groove 111 and an opening 112 in the radial direction, and a boss 61 is arranged on one side of the pull rod 6, and the boss 61 is inserted through the opening 112. connected to the groove 111. The boss 61 is placed in the groove 111 to realize the fastening between the pull rod 6 and the wedge 11 .

The pull rod 6 is provided with a plurality of pin holes 62 distributed at intervals. The pin holes 62 and the spring 12 are separated by a washer 13 , and the washer 13 is fixed on the side of the tooling base 1 . By placing a pin in the pin hole 62, the position of the pull rod 6 can be fixed. After the pin is removed, the wedge 11 is moved inward by the elastic force of the spring 12, and the column 7 is pushed upward to the bottom surface of the workpiece 10 to realize the adjustment of the position of the column 7. adjustable.

Preferably, the other side of the pull rod 6 is provided with a hand wheel 63 to facilitate pulling the pull rod 6 .

Preferably, the tooling base 1 is also provided with a pushing mechanism corresponding to the positioning mechanism. The pushing mechanism includes an L-shaped plate 2 and a locking screw 3. One side of the L-shaped plate 2 is fixed on the top surface of the tooling base 1. The locking screw 3 is screwed on the other side of the L-shaped plate 2 . A locking force can be provided to the workpiece 10 from the side, effectively eliminating the gap between the positioning pin on the positioning mechanism and the processing hole on the workpiece 10, and improving the positioning accuracy of the workpiece 10.

Preferably, the positioning mechanism includes cylindrical pins 4 and rhombic pins 5 fixed to the tooling base 1, and the supporting mechanism includes three positioning blocks 9 fixed to the tooling base 1, and each positioning block 9 is provided with two mutually parallel The fixing hole 91.

When the above-mentioned positioning fixture is in use, first fix the three positioning blocks 9 with the tooling base 1 through screws, and utilize the cooperation between the cylindrical pin 4 and the rhombic pin 5 on the positioning mechanism and the processing hole on the workpiece 10 to place the workpiece 10 Place it on the top surface of the positioning block 9 through the positioning mechanism, remove the pin on the pull rod 6, and use the elastic force of the spring 12 to push the wedge 11 to move inward until the top surface of the column 7 touches the bottom surface of the workpiece 10 to support the workpiece 10. Tighten the clamping screw at the position corresponding to the top surface of the workpiece 10 and the supporting surface of the workpiece 10, fix the workpiece 10 on the supporting mechanism, tighten the locking screw 3 on the pushing mechanism, and complete the positioning and clamping of the workpiece 10.

The above descriptions are only preferred embodiments of the present invention, and any modifications, equivalent replacements and improvements made within the spirit and scope of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. A positioning fixture with high mechanical processing size consistency, comprising a tooling base (1), said tooling base (1) is provided with a positioning mechanism and a supporting mechanism, is characterized in that: it also includes a support seat (8), a column (7) and a control mechanism for adjusting the height of the column (7), the support seat (8) is fixed on the top surface of the tool base (1), and the column (7) slides through the support The seat (8) is connected with the control mechanism, and the control mechanism is placed in the tool base (1). 2. A positioning jig with high machining dimensional consistency according to claim 1, characterized in that: the control mechanism includes a wedge (11) connected to the bottom of the column (7) and inserted into the The pull rod (6) on the side of the tooling base (1), one side of the pull rod (6) is connected to the wedge (11), and the outer periphery of the pull rod (6) is sleeved on the side close to the wedge (11). The spring (12), the bottom of the column (7) is provided with an inclined surface (71) adapted to the inclined surface of the wedge (11). 3. A positioning fixture with high machining dimensional consistency according to claim 2, characterized in that: a limit groove (11a) is provided on the inclined surface of the wedge (11), and the inclined surface (71) A limit block (72) matching the limit groove (11a) is arranged on the top. 4. A positioning fixture with high machining dimension consistency according to claim 2, characterized in that: the uppermost end of the slope of the wedge (11) is provided with an engaging portion (11b), and the engaging portion (11b) is radially provided with connected grooves (111) and openings (112), and one side of the pull rod (6) is provided with a boss (61), and the boss (61) passes through the opening ( 112) inserted into the groove (111). 5. A positioning fixture with high machining dimension consistency according to claim 2, characterized in that: the pull rod (6) is provided with a plurality of pin holes (62) distributed at intervals, and the pin holes ( 62) is separated from the spring (12) by a washer (13), and the washer (13) is fixed on the side of the tooling base (1). 6. A positioning fixture with high machining dimension consistency according to claim 2, characterized in that: a hand wheel (63) is provided on the other side of the pull rod (6). 7. A positioning fixture with high machining dimension consistency according to any one of claims 1 to 6, characterized in that: the tool base (1) is also provided with a corresponding positioning mechanism Pushing mechanism, the pushing mechanism includes an L-shaped plate (2) and a locking screw (3), one side of the L-shaped plate (2) is fixed on the top surface of the tooling base (1), the The locking screw (3) is screwed on the other side of the L-shaped plate (2). 8. A positioning jig with high machining dimension consistency according to claim 1, characterized in that: the positioning mechanism includes cylindrical pins (4) and rhombic pins ( 5). 9. A positioning fixture with high machining dimension consistency according to claim 1, characterized in that: the support mechanism includes three positioning blocks (9) fixed to the tooling base (1), each Each of the positioning blocks (9) is provided with two parallel fixing holes (91).