DE102009005262A1 - Non-rotating ejector pin, particularly for forming tools for plastic processing, has cylindrical tap or its central rest, which extends between two secants at same distance of absolute cylinder tap center - Google Patents

Abstract

The non-rotating ejector pin has a cylindrical tap (6.1) or its central rest, which extends between two secants at same distance of the absolute cylinder tap center. The head flat portion (11) forms a secant turned away from a pin shank (2) and connects both cylinders tap radius ends. The head profile of a pin head in accordance with German institute for standardization 1530does not exceed full-extent circle line.

Description

task It is the object of the present invention to provide a non-rotating ejector pin, preferably for molding tools for plastics processing, to provide its characteristic requirements, both with regard to the first to be accomplished Einsitzeinbringung into the mold support plate group, as well as the realization an acceptable lifetime in the operation within a per according to the task defined accuracy level - without that the delivery condition requires a change effort, or that this is economical.

Solved to be the object by the features formulated in claim 1.

The essential, integrated concept of the present invention is based on all four embodiments:
A cylindrical journal (Fig. 1) or merely its functionally relevant middle remainder (Figs. 2, 3 and 4) is slidably seated in a rectilinear, parallel throat extending transversely to the circular direction of rotation. Cylinder and throat can be assigned to each other - either the throat is located in the pin head (Figure 1), or the throat is in the Auswerfertragplatte ( 3.1 ) (Figures 2, 3 and 4).

Cylinder diameter and throat width are identical and their center axes have their origin in Stiftschaftzentrum. The parallel course of the pharynx ( 5 ) basically allows a change in position of the cylinder pin, such as single-seat rule ( 5.2 ), based on the design dimension.

In addition, the cylinder pin ( 7 ) make a small, but sufficient bilateral pivoting.

The largely industrial production process, which is indispensable in high-wage countries, both of these properties work to a large extent - each for itself or both in cooperation. In particular, when required zero clearance different customary Liche types require final Feinabstimmungs effort. The absolutely backlash-free direct installation of the male head area ( 8th ) and the opposite pen shaft sector ( 4.1 ) requires highest accuracy, with the larger diameter tolerance of the shank thickening ( 2.1 ) of up to 0.04 mm, which increases the difficulty level. The design according to the invention requires only an exact fit with regard to the single seat of the shaft thickening region ( 2.1 ) in the support plate through-hole ( 4 ) - the mobility of the cylinder journal ( 6.1 . 7 ) in the throat ( 5 ) allows flexibility without twisting gain.

Does the initially defined accuracy level permit a circulating clearance with respect to the pen shaft ( 2.1 ) and the support plate through-hole ( 4 ), the situation is as follows:
The pin shaft can take any position within the free gap, which means that the inlet hole in the cavity forms the priority for the further alignment axis course or she pretends, which naturally causes a desirable protective effect. In this respect, the concept of a self-position-optimizing rotation is justified.

The four embodiments mentioned are explained in detail below:
Figure 1 shows a two-stage anti-rotation device: In the eccentric to the pen shaft ( 2 ) molded-on pen head ( 1 ) in the analogously manufactured Kopfeinsenkung ( 3 ), stage one is in function. This application is common in tasks with respect to coarser tolerated anti-rotation (flat crowning, etc.). In order to gain greater acceptance, a second stage suitable for zero play should be added.

This is done as follows:
The eccentric to the pin shank through hole ( 4 ) introduced pin head depression ( 3 ) is particularly suitable for the solution according to the invention: the flat surface of the depression consists of a small area ( 1.1 ) and a large area zone ( 1.2 ).

The large-area zone allows the receiving bore ( 6 ) of a suitable cylinder pin ( 6.1 ) in the support plate ( 3.1 ), whose diameter is the width of the pin header ( 5.1 ).

Figure 2 shows the same principle in a modified form:
The pen shaft ( 2 ) facing pin head plane surface is its large area zone ( 1.2 ) a cylinder pin middle remainder ( 7 ) and closes at the same height as well as slightly constricted ( 7.1 ) to the pen shaft ( 2 ) at. The support plate has an analogously arranged throat ( 5 ), in which the cylinder pin-Mit telrest ( 7 ) slidably seated.

About that In addition, two versions have a design closeness to the usual ejector pin according to standard on. The user should be able to use it in dual ways - or; but at least such an application should be technically acceptable as well as economically feasible. An internal factory Stockpiling - for urgent repairs z. B. - would be only by means of a product family vorzuhalten.

Figure 3 shows a pen head shape ( 1 ), which in the standard Kopfeinsenkung ( 3.2 ) is also insertable. The molding of the cylinder pin in middle remainder construction ( 7 ) favors the production of the Stiftkopfeinsenkung ( 3 ) for non-rotating application, preferably manufactured by machine web control. A sufficiently sized milling tool is conducive to economical machining performance.

The design according to Figure 4 is not directly dual mountable:
The cylindrical pin middle remainder ( 7 ) form two to the standard pin head cylinder surface ( 8th ) defines molded studs ( 9 ). The production of the Stiftkopfeinsenkung ( 3 ) requires no path control / when using larger sized Zerspanungsmittel.

By basically simple removal of both Anstollen ( 9 ), circular section-like ( 10 ), all the way to the orienting, circulating standard pin head cylinder jacket surface ( 8th ), this is carried out quickly and without further aids.

Conceivable is a third field of application: forming tools with 48 and more round executed, twist-proof cavities come with large injection molding application often before certain Standard manufacturers manufacture appropriate blank specifications.

The embodiment according to Figure 4 lends itself to the extent that the outside of the actual circular surface located, molded studs ( 9 ) for the purpose of anti-rotation ensures their total preservation and thus expands the constructive freedom for further technical designs or even permits them (sealing-groove recess, etc.).

Unlike the ejector pin is the shaft diameter ( 2 ) before the upsetting process in "Semifinish". The thereby forming, so-called shaft thickening ( 2.1 ) is to be reworked to exact nominal size. The core or Gesenkkopfmantelfläche ( 8th ) low towering two levels ( 11 ) are used for subsequent processing as an orientation reference and are positioned at right angles to the throat.

Orientation sheet or guide of the Scope of the invention in short form, and letter assignment and reference numerals list

Fig. 1: Two-stage anti-twist device, ejector pin - type:
A pin shaft is a cylindrical pin head eccentrically formed - throat in the pin head / cylinder pin in support plate.

Figure 2: Two-stage anti-twist device, ejector pin - type:
A pin shaft is a cylindrical pin head eccentrically formed, which has a kröpfungsartigen, the pin shank facing cylinder pin middle remainder - throat in support plate.

Figure 3: Dual ejector pin, type: Conventional - head and shaft have a common central axis.
Application 1: Pen head recess integrated within the DIN 1530 or similar circular line the parallel effective region of a pharynx for the purpose of fixing the cylindrical pin middle remainder.
Application 2: Pen head recess according to DIN 1530 : Infinitely rotatable - throat in support plate.

Fig. 4: Anti-rotation ejector pin, option multiway, type:
Conventional - head and shaft have a common central axis, parallel throat outside the circumference of the Stiftkopfeinsenkung according to DIN 1530 , After removal of two formwork tunnels: DIN 1530 compatible - throat in support plate. Letters assignment: Z Pin head depression regarding picture 1 Y Pin head depression with regard to picture 2 X Pin head depression regarding picture 3 W Pin head depression regarding picture 4

1

Auswerferstiftkopf

1.1

small area Zone

1.2

large-scale Zone

1.3

eccentric conformation

2

pin shank

2.1

Pin shank-thickening

3

Pinhead-depression

3.1

support plate

3.2

circle line DIN 1530 the pen head recess

4

Pin shank through bore

4.1

Opposite sector

5

throat

5.1

Pin head throat

5.2

Throat / cylinder pin seat on rule

6

straight pin location hole

6.1

straight pin

7

Cylinder pin-agent residue

7.1

Cylinder trunnion radius end

8th

Pinhead-cylinder surface

9

Anformstollen

10

Circular segment-like separation

11

Pin head-flattening or orientation level

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited non-patent literature

• - DIN 1530 [0021]
• - DIN 1530 [0021]
• - DIN 1530 [0022]
• - DIN 1530 [0022]
• - DIN 1530 [0022]

Claims (7)

Non-rotating ejector pin, preferably for molding tools for plastics processing, characterized in that a cylinder pin ( 6.1 ) or its remainder ( 7 ), which extends between two secants, each having the same or approximately the same distance from the absolute center of the cylinder pin, wherein the pin shaft ( 2 ) remote secant the Kopfabflachung ( 11 ) and the secant facing the pen shaft is of a theoretical nature and has both cylindrical journal radii ( 7.1 ) and in a - transverse to the circular direction of rotation - parallel throat ( 5 ) slidably seated. Anti-rotation ejector pin according to claim 1, characterized in that the cylinder pin diameter ( 6.1 . 7 ) and the throat width ( 5 ) Have dimensional equality. Anti-rotation ejector pin according to claim 1 or 2, characterized in that the eccentric ( 1.3 ) to the Stiftschaft ( 2 ) molded-on pen head ( 1 ) in its large area zone ( 1.2 ) of the planar surface has an entire head height penetrating, slot-like throat opening. Anti-rotation ejector pin according to claim 3, characterized in that the eccentric ( 1.3 ) to the Stiftschaft ( 2 ) molded-on pen head ( 1 ) on its large area ( 1.2 ) of the pen shaft ( 2 ) facing a cylindrical pin middle remainder ( 7 ), which in unchanged height, and with the width of the secant ( 11 ) to the pen shaft ( 2 respectively. 2.1 ). Anti-rotation ejector pin according to one of the preceding claims, characterized in that the head profile (Figure 3) the full circumference ( 3.2 ) of a standard pin head according to DIN 1530 does not exceed. Non-rotating ejector pin according to one of the preceding claims, characterized in that a standard pin head cylindrical surface ( 8th ) two tunnels ( 9 ) are defined and formed in this way the cylindrical pin middle remainder ( 7 ) and that between the tunnels ( 9 ) located cylinder jacket surface ( 8th ) the radius - starting from the pin head center - corresponds to the remaining, general, standard according to DIN 1530 defined circle and opposite plane ( 11 ) runs underfloor. Anti-rotation ejector pin according to claim 1, 3, 4, 5 and 6, characterized in that the pin head flattening or orientation plane is positioned at right angles to the throat is.