CN105127805A - Clamp for milling end face of gear reversing and shifting cantilever at machining center - Google Patents

Abstract

The invention discloses a fixture for milling the end face of a cantilever for reverse gear shifting in a machining center, comprising a bottom plate, a positioning base, a positioning base support block, a hoisting ring, two workpiece clamping mechanisms arranged side by side on the left and right, and a workpiece positioning block The two positioning shafts on the top are respectively inserted into the corresponding mounting holes on the workpiece; each inclined surface of the V-shaped opening of the V-shaped positioning block is welded with a hard alloy block, which presses the workpiece from the left and right sides behind the workpiece respectively; the pressure plate There is a semi-circular slot at the end of the hydraulic angle cylinder, and the hydraulic angle cylinder drives the pressure plate to rotate so that the end of the pressure plate is pressed against the upper end surface of the workpiece at the right rear; On the left front wall; the executive end of the lever hydraulic cylinder is against the center position of the front part of the workpiece; the cantilever end of the workpiece is clamped by the limit fixed block and the elastic jacking mechanism. Applied to vertical machining centers, it can quickly and accurately clamp and position workpieces, reduce the number of fixtures and clamping times, improve work efficiency, and reduce labor costs.

Description

A fixture for milling the end face of the cantilever of the reverse gear shifting in the machining center

technical field

The invention relates to a processing fixture for parts of a transmission, in particular to a fixture for milling the end face of a reverse gear shift cantilever in a machining center.

Background technique

The processing of the reverse gear shift cantilever needs to go through multiple processes, including processing on CNC lathes, honing machines, and vertical drilling machines. The existing problems are: many times of clamping, long circulation time, easy to cause repeated positioning errors and bump damage ;Each process requires one person to operate, and requires the cooperation of multiple operators to complete.

Contents of the invention

The purpose of the present invention is to provide a fixture specially used for the vertical machining center for milling the end face of the cantilever for reverse gear shifting. Machine, vertical drilling machine equipment to complete the processing, saving procedures and clamping times, improve production efficiency.

For this reason, the technical solution adopted by the present invention is: a fixture for milling the end face of the cantilever for reverse gear shifting in a machining center, including a base plate, a positioning base and a positioning base support block, and the positioning base passes through the positioning base The support block is installed above the bottom plate, so as to free up a closed space between the positioning base and the bottom plate for the arrangement of oil pipelines. Two workpiece clamping mechanisms are arranged side by side above the bottom plate to clamp the two workpieces respectively. The workpiece clamping mechanism includes a workpiece mounting block installed on the positioning base, a V-shaped positioning block, an elastic top tightening mechanism and a locking fixed block, as well as a limit fixed block installed on the bottom plate, a hydraulic corner cylinder and a lever type. Hydraulic cylinder;

The workpiece positioning block is fixed with two positioning shafts perpendicular to the bottom plate and spaced left and right, and the two positioning shafts are respectively inserted into corresponding mounting holes on the workpiece;

The V-shaped positioning block is located behind the workpiece mounting block, and the V-shaped opening is facing the workpiece mounting block. A cemented carbide block is welded on each slope of the V-shaped opening, and two cemented carbide blocks are arranged symmetrically. Press the workpiece from the left and right sides behind the workpiece respectively;

The hydraulic angle cylinder is located behind the V-shaped positioning block. A pressure plate is installed on the oil pressure angle cylinder. The end of the pressure plate is provided with a semicircular slot matching the outer wall of the positioning shaft. The oil pressure angle cylinder drives the pressure plate Rotate so that the end of the pressure plate is pressed against the upper surface of the workpiece at the right rear, and at the same time, the semicircular notch is half-wrapped outside the positioning shaft;

The locking and fixing block is located at the left front of the workpiece mounting block, and the locking screw passes through the locking and fixing block horizontally and leans against the left front wall of the workpiece;

The lever-type hydraulic cylinder is located directly in front of the workpiece mounting block, and the execution end of the lever-type hydraulic cylinder is in the middle of the front part of the workpiece;

The limiting fixed block and the elastic clamping mechanism are arranged at intervals on the right side of the workpiece mounting block, the cantilever end of the workpiece extends between the limiting fixed block and the elastic clamping mechanism, and passes through the limiting fixed block and the elastic clamping mechanism. Clamping by the jacking mechanism;

Each of the four corners of the bottom plate is provided with a hoisting ring and a bottom plate installation hole, and the centers of the four hoisting rings coincide with the center of gravity of the positioning fixture.

When clamping, the main body of the workpiece is installed on the two positioning shafts of the workpiece positioning block, and the cantilever end of the workpiece is placed between the limit fixing block and the elastic clamping mechanism to initially position the workpiece positioning block; the left and right sides of the rear part of the workpiece The sides are respectively pressed by the hard alloy block on the V-shaped positioning block, the left front wall of the workpiece is pressed by the locking screw, the lever-type hydraulic cylinder is pressed against the center of the front of the workpiece, and the pressure plate is driven by the hydraulic angle cylinder Rotate to make the end of the pressing plate press the upper end surface of the right rear of the workpiece, and finally the workpiece is clamped.

Preferably, the elastic clamping mechanism includes a fixed seat, and a movable ejector rod, a blocking block and a spring installed in the fixed seat, and the head of the movable ejector rod passes through the fixed seat and extends to the fixed seat to be fixed in a limited position. Between the blocks, the spring is located at the rear of the movable push rod and is limited in the fixed seat by a block; the limit fixed block includes a fixed support and a horizontally installed bolt and nut assembly, and the bolt end of the bolt and nut assembly is located at the fixed Between the support and the fixed seat; the cantilever of the workpiece is clamped by the bolt end and the movable ejector rod. By adjusting the pre-tightening force of the spring and the screw-in length of the bolt, it can adapt to the cantilever clamping of different thickness specifications.

Beneficial effects of the present invention: the pressure plate adopts a semicircular slot to increase the contact area with the workpiece and improve the pressing force; a closed space is left between the positioning base and the bottom plate for the arrangement of oil pipelines, which is convenient for pipeline layout and maintenance to ensure that the operation table is clean; the layout is reasonable and the design is ingenious, and it is applied to the vertical machining center, which can quickly and accurately clamp and position the workpiece. Processing, and two stations can be operated by one person. Compared with the traditional processing technology, the number of fixtures and the number of clamping times are reduced, the work efficiency is improved, and the labor cost is reduced.

Description of drawings

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

Fig. 2 is a structural schematic diagram of the workpiece clamping mechanism.

Fig. 3 is an effect diagram of the installation of the workpiece on the workpiece clamping mechanism.

Detailed ways

Below by embodiment and in conjunction with accompanying drawing, the present invention will be further described:

As shown in Fig. 1-Fig. 3, a fixture for milling the end face of a cantilever for reverse gear shifting in a machining center mainly consists of a bottom plate 1, a workpiece mounting block 2, a positioning base 13, a positioning base supporting block 14 and two left and right It consists of workpiece clamping mechanisms B arranged side by side. The two workpiece clamping mechanisms B are used to clamp two workpieces respectively, so they are called fixtures for milling the end face of the reverse gear shift cantilever in the machining center.

The positioning base 13 is installed above the bottom plate 1 through the positioning base support block 14, thereby leaving a closed space between the positioning base 13 and the bottom plate 1 for arranging oil pipelines. The workpiece clamping mechanism B is mainly composed of workpiece mounting block 2, V-shaped positioning block 3, limit fixing block 4, elastic top tightening mechanism 5, locking fixing block 6, hydraulic angle cylinder 7, lever type hydraulic cylinder 8, lock Tight screw rod 9, pressing plate 10, positioning shaft 11, cemented carbide block 12 are formed. Among them, the workpiece mounting block 2, the V-shaped positioning block 3, the elastic top tightening mechanism 5 and the locking fixed block 6 are installed on the positioning base 13, the limit fixed block 4, the hydraulic corner cylinder 7 and the lever type hydraulic cylinder 8 Installed on base plate 1.

The workpiece positioning block 2 is fixed with two positioning shafts 11 perpendicular to the bottom plate 1 and spaced left and right, and the two positioning shafts 11 are respectively inserted into corresponding mounting holes on the workpiece A.

The V-shaped positioning block 3 is located at the rear of the workpiece mounting block 2, and the V-shaped opening is facing the workpiece mounting block 2. A cemented carbide block 12 is welded on each slope of the V-shaped opening, and there are about two cemented carbide blocks 12. Symmetrical setting, press the workpiece A from the left and right sides behind the workpiece A respectively.

The hydraulic angle cylinder 7 is located behind the V-shaped positioning block 3, and a pressure plate 10 is installed on the oil pressure angle cylinder 7. The end of the pressure plate 10 is provided with a semicircular slot 10a matching the outer wall of the positioning shaft 11. The oil pressure angle The cylinder 7 drives the pressing plate 10 to rotate so that the end of the pressing plate 10 is pressed on the upper end surface of the workpiece A right rear, and the semicircular groove 10a is just in time half wrapped outside the positioning shaft 11. Preferably, the rotation angle of the pressing plate 10 is set to 90°, which just presses the upper end surface of the workpiece A right rear.

The locking and fixing block 6 is located at the left front of the workpiece mounting block 2 , and the locking screw 9 obliquely passes through the locking and fixing block 6 horizontally and abuts against the left front wall of the workpiece A. The end of locking screw rod 9 is inclined to the right side relative to the tail, to vacate space to arrange lever type hydraulic cylinder 8. The locking screw 9 is pressed against the workpiece on the left front wall, and the pressure plate 10 driven by the hydraulic angle cylinder 7 is pressed on the upper surface of the workpiece A at the right rear, so as to prevent the workpiece A from deflecting during processing.

The lever type hydraulic cylinder 8 is located directly in front of the workpiece mounting block 2, and the execution end of the lever type hydraulic cylinder 8 abuts against the center position of the front part of the workpiece A.

The limit fixed block 4 and the elastic clamping mechanism 5 are arranged at intervals on the right side of the workpiece mounting block 2. The cantilever end of the workpiece A extends between the limit fixed block 4 and the elastic clamp mechanism 5, and passes through the limit fix block. 4 and the elastic clamping mechanism 5 are clamped.

Preferably, the elastic clamping mechanism 5 is composed of a fixed seat 5a, a movable ejector rod 5b installed in the fixed seat 5a, a blocking block 5c and a spring 5d. The head of the movable push rod 5b passes through the fixed seat 5a and then extends between the fixed seat 5a and the limit fixed block 4. The spring 5d is located behind the movable push rod 5b and is limited in the fixed seat 5a by the blocking block 5c. The limit fixed block 4 is composed of a fixed support 4a and a horizontally installed bolt and nut assembly 4b. The bolt end of the bolt and nut assembly 4b is located between the fixed support 4a and the fixed seat 5a; the cantilever of the workpiece A is clamped by the bolt end and the movable ejector rod 5b.

Each of the four corners of the bottom plate 1 is provided with a hoisting ring 15 and a bottom plate installation hole 1a, and the centers of the four hoisting rings 15 coincide with the center of gravity of the positioning fixture. The four hoisting rings 15 are arranged in a rectangle, and the four bottom plate installation holes 1a are arranged in a rectangle.

Claims (2)

1. A fixture for machining center milling reverse gear shift cantilever end face, comprising base plate (1), positioning base (13) and positioning base support block (14), it is characterized in that: described positioning base ( 13) The positioning base support block (14) is installed above the bottom plate (1), thereby freeing a closed space between the positioning base (13) and the bottom plate (1) for arranging oil pipelines, and the bottom plate (1 ) are arranged side by side above the two workpiece clamping mechanisms (B) to clamp the two workpieces (A) respectively, and the workpiece clamping mechanism (B) includes a workpiece mounting block ( 2), V-shaped positioning block (3), elastic jacking mechanism (5) and locking fixed block (6), and the limit fixed block (4) installed on the bottom plate (1), hydraulic angle cylinder (7 ) and lever type hydraulic cylinder (8); The workpiece positioning block (2) is fixed with two positioning shafts (11) perpendicular to the bottom plate (1) and spaced left and right, and the two positioning shafts (11) are respectively inserted into corresponding mounting holes on the workpiece (A) ; The V-shaped positioning block (3) is positioned at the rear of the workpiece mounting block (2), and the V-shaped opening faces the workpiece mounting block (2), and a cemented carbide block (12) is welded on each slope of the V-shaped opening. ), two cemented carbide blocks (12) are symmetrically arranged left and right, and the workpiece (A) is compressed from the left and right sides of the workpiece (A) rear respectively; The hydraulic angle cylinder (7) is positioned at the rear of the V-shaped positioning block (3), and a pressure plate (10) is installed on the oil pressure angle cylinder (7), and the end of the pressure plate (10) is provided with a (11) The semicircular slot (10a) matching the outer wall, the hydraulic angle cylinder (7) drives the pressure plate (10) to rotate so that the end of the pressure plate (10) is pressed against the upper end surface of the workpiece (A) right rear, and at the same time The semicircular slot (10a) is just half wrapped around the positioning shaft (11); The locking and fixing block (6) is located at the left front of the workpiece mounting block (2), and the locking screw (9) passes through the locking and fixing block (6) obliquely horizontally and abuts against the left front wall of the workpiece (A) ; The lever-type hydraulic cylinder (8) is located directly in front of the workpiece mounting block (2), and the execution end of the lever-type hydraulic cylinder (8) is in the center of the front part of the workpiece (A); The position-limiting fixed block (4) and the elastic jacking mechanism (5) are arranged at intervals on the right side of the workpiece mounting block (2), and the cantilever end of the workpiece (A) extends to the position-limiting fixed block (4) and Between the elastic clamping mechanism (5), and clamped by the limit fixed block (4) and the elastic clamping mechanism (5); Each of the four corners of the base plate (1) is provided with a hoisting ring (15) and a base plate mounting hole (1a), and the centers of the four hoisting rings (15) coincide with the center of gravity of the positioning fixture. 2. The clamp for milling the end face of the cantilever of the reverse gear shifting in the machining center according to claim 1, characterized in that: the elastic clamping mechanism (5) includes a fixed seat (5a), and is installed on the fixed seat (5a) ) inside the movable ejector rod (5b), blocking block (5c) and spring (5d), the head of the movable ejector rod (5b) passes through the fixed seat (5a) and then extends to the fixed seat (5a) and the limit Between the fixed blocks (4), the spring (5d) is located behind the movable push rod (5b) and is limited in the fixed seat (5a) by the blocking block (5c); the limit fixed block (4) includes a fixed support (4a) and a horizontally installed bolt and nut assembly (4b), the bolt end of the bolt and nut assembly (4b) is located between the fixed support (4a) and the fixed seat (5a); the cantilever of the workpiece (A) It is clamped by the bolt head and the movable ejector rod (5b).