CN105108254B - Suitable for installing side linear cutting clamp before the starter that is processed and formed at one time - Google Patents

Abstract

The invention relates to a wire cutting fixture suitable for one-time processing and forming of the front mounting edge of a starter, comprising: a circular support base plate, and a U-shaped pressing plate matched with the support base plate for fixing a mold. A stepped hole for placing workpieces to be processed is provided on the supporting base plate. There is a through hole in the stepped hole. The inner surface of the through hole corresponds to the outer arc surface e and the other side arc surface f of the part. The circle of the first arc surface is eccentric to the stepped hole, the circle of the second arc surface opposite to the arc surface is concentric with the stepped hole, and the center of the second arc surface is provided with a The semi-arc-shaped protrusion h of the part corresponds to the semi-circular groove. A threading hole is provided on the support plate adjacent to the semicircular groove for threading and cutting, and a communicating groove is provided between the semicircular groove and the threading hole. The wire cutting jig for installation edge of the present invention shortens the processing time, avoids knocking and bruising of parts during the transfer process, and improves production efficiency and quality.

Description

Suitable for one-time processing and forming wire cutting fixture for the front mounting edge of the starter

technical field

The invention relates to the field of parts processing, in particular to a wire cutting fixture for the front mounting edge of a starter.

Background technique

The front mounting edge is a part of a certain aircraft starter, and it is a vulnerable part when the starter is repaired. When this part was previously processed, the inner and outer eccentric cylindrical surfaces were processed on a lathe, and the eccentric shape was processed on a machining center. Machining eccentric cylindrical surfaces on lathes requires eccentric fixtures, and machining eccentric shapes on machining centers also requires fixtures. Parts are processed from blanks to finished products, and multiple sets of special fixtures are required. Since the purchase of fixtures requires funds and the machining center machine tool undertakes many tasks, and the processing cost on the machining center machine tool is relatively high, the eccentric cylindrical surface and eccentric shape are considered to be processed once on the wire electric discharge machine tool with low processing cost.

Before cutting the front mounting edge, the mold is a concentric ring, as shown in Figure 1A and Figure 1B, the inner surface of the concentric ring is a funnel-shaped hollow cylinder a protruding upwards, the bottom of the hollow cylinder a and the mounting edge There is an annular groove b at the connection, and there is an annular boss c on the outside of the annular groove b. The hollow cylinder a is a non-cutting area, and there is a positioning hole d on the annular boss c. After cutting, as shown in Figure 2, the part has The circle where the outer arc surface e with many bosses is located is eccentric to the circle where the hollow cylinder a is located, relative to the other side arc surface f of the outer arc surface e, and concentric with the circle where the hollow cylinder a is located, the center of the arc surface f It has a semi-arc-shaped protrusion h extending radially outward, and the center of the semi-arc-shaped protrusion h is provided with an axially distributed positioning hole. The positioning hole and the semi-arc-shaped protrusion have an eccentric structure. It is processed on the basis of the positioning hole d of the concentric ring.

Contents of the invention

The technical problem to be solved by the present invention is to provide a wire cutting fixture suitable for one-time processing and forming of the front mounting edge of the starter.

In order to solve the above-mentioned technical problems, the present invention provides a wire cutting fixture for the front installation of the starter, including: a circular support base plate whose bottom surface is in contact with the workbench, and a U-shaped pressing plate for fixing the mold matched with the support base plate .

A stepped hole for placing workpieces to be processed is provided on the supporting base plate. There is a through hole in the stepped hole. The inner surface of the through hole corresponds to the outer arc surface e and the other side arc surface f of the part. The circle of the first arc surface is eccentric to the stepped hole, the circle of the second arc surface opposite to the first arc surface is concentric with the stepped hole, the first arc surface and the second A chamfer is provided at the junction of the arc surfaces, and a semicircular groove corresponding to the semi-arc protrusion h of the part is provided at the center of the second arc surface.

A plurality of positioning holes are distributed on the supporting base plate for positioning the mould, and a threading hole is provided on the supporting base plate adjacent to the semicircular groove for threading and cutting, and the semicircular groove and the threading hole are A connecting groove is arranged between the wire holes.

There are 3-5 bolt holes evenly distributed on the support base plate, and the U-shaped pressing plate is fixedly matched with the bolt holes on the support base plate through bolts, and a washer is arranged between the U-shaped pressing plate and the bolts.

The diameter of the stepped hole of the support base plate is 0.02-0.15 mm larger than the outer diameter of the mold (ie, the concentric ring), so as to ensure that the mold can be smoothly loaded into the stepped hole.

Both ends of the bottom of the U-shaped pressing plate are provided with downward projections, which are suitable for limiting and compressing the mold.

The fixture is clamped in a plate-type support mode. In order to facilitate alignment and position adjustment, a concave shoulder is provided on the outer surface of the support base plate. The working method of the wire-cutting fixture while installing in front of the starter includes: placing the fixture on the worktable of the machine tool, and adjusting it with the method of aligning the dial indicator, that is, fixing the dial indicator on the wire rack or At other positions, the measuring head of the dial gauge contacts the side of the concave shoulder, moves the worktable back and forth, and adjusts the position of the fixture according to the value indicated by the dial gauge until the deflection range of the pointer of the dial gauge reaches the required value. Keep the positioning datum plane of the fixture parallel to the table surface of the machine tool and the feed direction x or y of the worktable to ensure the relative position accuracy between the cut surface and the datum plane.

When in use, place the mold to be processed in the stepped hole of the supporting base plate, and position the mold through the positioning hole so that the center of the positioning hole d on the mold passes through the center of the groove, then install the U-shaped pressing plate, and tighten it The bolts press the mold to be processed in the support base plate through the U-shaped pressing plate; the electrode wire passes through the wire hole, enters the stepped hole along the groove, and cuts along the through hole.

The technical effect of the present invention: the use of the wire cutting fixture for the front installation of the starter of the present invention simplifies the processing procedure, shortens the processing time, and avoids knocking and bruising of the parts due to unpredictable reasons during the transfer process. The production efficiency and product quality are improved, and the production cost is saved. Please refer to the comparison table of the two processing methods for the post-installation side in the specific embodiment.

Description of drawings

Below in conjunction with accompanying drawing, the present invention is described in further detail:

Figure 1A is a schematic diagram of the mold before cutting the front mounting edge,

Fig. 1B is a schematic cross-sectional view of A-A in Fig. 1A,

Figure 2 is a schematic diagram of the structure after cutting the front mounting edge,

Fig. 3A is a schematic structural view of the wire cutting jig of the present invention,

Fig. 3B is a B-B sectional view of Fig. 3A,

Figure 3C is a schematic structural view of the supporting base plate,

Fig. 4 is a structural schematic diagram of a U-shaped pressing plate.

detailed description

As shown in Fig. 3A-Fig. 4, the wire cutting fixture for installation of the present embodiment includes: a circular support base plate 1 whose bottom surface is in contact with the workbench, and a U-shaped pressing plate 2 for fixing the mold matched with the support base plate 1 .

A stepped hole 11 for placing workpieces to be processed is provided on the support base 1, and a through hole 12 is provided in the stepped hole 11. Two sections of semicircular arc surfaces corresponding to the arc surface f are formed, wherein the circle where the first arc surface 13 is located is eccentric to the stepped hole 11, and the circle where the second arc surface 14 is opposite to the first arc surface is located and the stepped hole 11 Concentrically, a chamfer is provided at the junction of the first arc surface 13 and the second arc surface 14, and a semicircular groove 15 corresponding to the semi-arc protrusion h of the part is provided at the center of the second arc surface 14.

A plurality of positioning holes 18 are distributed on the supporting base plate 1 for positioning the mould, and a threading hole 10 is provided on the supporting base plate 1 adjacent to the semicircular groove 15 for threading and cutting. A groove 19 communicated between the groove 15 and the threading hole 10 is provided.

There are 3-5 bolt holes 16 uniformly distributed on the support base plate 1, and the U-shaped pressing plate 2 is fixedly matched with the bolt holes 16 on the support base plate through the bolts 3. Between the U-shaped pressing plate 2 and the bolts 3 A washer 4 is provided.

The diameter of the stepped hole 11 of the support base 1 is 0.02-0.15 mm larger than the outer diameter of the mold (ie, the concentric ring), so as to ensure that the mold can be smoothly loaded into the stepped hole 11 .

Both ends of the bottom of the U-shaped pressing plate 2 are provided with downward projections 21, which are suitable for limiting the shoulder portion of the mold and pressing the mold.

The clamp adopts a plate support mode for clamping. In order to facilitate alignment and position adjustment, a concave shoulder 17 is provided on the outside of the surface of the support base. The working method of the wire-cutting fixture while installing in front of the starter includes: placing the fixture on the worktable of the machine tool, and adjusting it with the method of aligning the dial indicator, that is, fixing the dial indicator on the wire rack or At other positions, the measuring head of the dial gauge contacts the side of the concave shoulder, moves the worktable back and forth, and adjusts the position of the fixture according to the value indicated by the dial gauge until the deflection range of the pointer of the dial gauge reaches the required value. Keep the positioning datum plane of the fixture parallel to the table surface of the machine tool and the feed direction x or y of the worktable to ensure the relative position accuracy between the cut surface and the datum plane.

When in use, the mold to be processed is placed in the stepped hole 11 of the support base plate 1, and the mold is positioned through the positioning hole 18, so that the center of the positioning hole d on the mold passes through the center of the groove 19, and then the U-shaped compression plate 2, tighten the bolt 3, press the mold to be processed in the support base plate 1 through the U-shaped pressing plate 2; Make a cut.

The comparison table of the two processing methods of the front mounting edge is as follows:

Claims (1)

1. A wire cutting fixture for mounting the edge before a starter, characterized in that it comprises: a circular support base plate in contact with the workbench, and a U-shaped pressing plate for fixing the mould, which is matched with the support base plate; A stepped hole for placing workpieces to be processed is provided on the supporting base plate, and a through hole is provided in the stepped hole, and the inner surface of the through hole is composed of two sections of semicircular arc surfaces, wherein the first arc surface is located The circle is eccentric to the stepped hole, the circle where the second arc surface opposite to the first arc surface is located is concentric with the step hole, the connection between the first arc surface and the second arc surface is provided with a chamfer, and the center of the second arc surface is provided with a chamfer. with semicircular grooves; A plurality of positioning holes are distributed on the supporting base plate, a threading hole is provided on the supporting base plate adjacent to the semicircular groove, and a connected groove is provided between the semicircular groove and the threading hole; There are 3-5 bolt holes evenly distributed on the support base plate, the U-shaped compression plate is fixedly matched with the bolt holes on the support base plate through bolts, and a washer is arranged between the U-shaped compression plate and the bolts; The diameter of the stepped hole of the support base plate is 0.02-0.15mm larger than the outer diameter of the mould.